/* ==========================================================================
   Vinit Niwalkar — Portfolio
   Premium dark-first developer theme · CSS3 only
   ========================================================================== */

/* ---------- 1. Design tokens ---------- */
:root {
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-display: 'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  --bg: #08090f;
  --bg-2: #0c0e18;
  --surface: rgba(255, 255, 255, 0.035);
  --surface-2: rgba(255, 255, 255, 0.06);
  --surface-3: rgba(255, 255, 255, 0.09);
  --border: rgba(255, 255, 255, 0.09);
  --border-2: rgba(255, 255, 255, 0.16);

  --text: #ecebf2;
  --text-2: #b0b1c4;
  --muted: #6d7086;

  --accent: #6366f1;
  --accent-2: #22d3ee;
  --accent-3: #a78bfa;
  --gradient: linear-gradient(120deg, #6366f1 0%, #22d3ee 100%);
  --gradient-soft: linear-gradient(120deg, rgba(99, 102, 241, 0.16), rgba(34, 211, 238, 0.12));

  --glow-a: rgba(99, 102, 241, 0.26);
  --glow-b: rgba(34, 211, 238, 0.16);

  --shadow-sm: 0 4px 18px -6px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 18px 48px -18px rgba(0, 0, 0, 0.55);
  --shadow-lg: 0 30px 80px -30px rgba(0, 0, 0, 0.7);

  --radius-sm: 10px;
  --radius: 16px;
  --radius-lg: 22px;
  --radius-pill: 999px;

  --nav-h: 72px;
  --container: 1140px;
  --gap: 22px;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --ease-quick: cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-theme='light'] {
  --bg: #f6f7fb;
  --bg-2: #ffffff;
  --surface: rgba(17, 20, 42, 0.04);
  --surface-2: rgba(17, 20, 42, 0.07);
  --surface-3: rgba(17, 20, 42, 0.1);
  --border: rgba(17, 20, 42, 0.1);
  --border-2: rgba(17, 20, 42, 0.2);

  --text: #13162a;
  --text-2: #404463;
  --muted: #6a6e89;

  --gradient: linear-gradient(120deg, #5b5ef0 0%, #16b8d8 100%);

  --glow-a: rgba(99, 102, 241, 0.16);
  --glow-b: rgba(34, 211, 238, 0.14);

  --shadow-sm: 0 4px 16px -6px rgba(30, 34, 80, 0.14);
  --shadow-md: 0 18px 44px -20px rgba(30, 34, 80, 0.22);
  --shadow-lg: 0 30px 70px -30px rgba(30, 34, 80, 0.3);
}

/* ---------- 2. Reset & base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-h) + 12px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color 0.4s var(--ease), color 0.4s var(--ease);
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  line-height: 1.15;
  letter-spacing: -0.02em;
}

::selection {
  background: var(--accent);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 3. Layout utilities ---------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(20px, 5vw, 40px);
}

.section {
  padding-block: clamp(72px, 10vh, 124px);
  scroll-margin-top: calc(var(--nav-h) + 8px);
  position: relative;
}

.section-head {
  max-width: 640px;
  margin-bottom: clamp(36px, 6vh, 56px);
}

.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 14px;
}

.section-eyebrow::after {
  content: '';
  width: 36px;
  height: 1px;
  background: var(--gradient);
  opacity: 0.7;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700;
}

.section-sub {
  margin-top: 12px;
  color: var(--text-2);
  font-size: 1rem;
}

/* ---------- 4. Skip link ---------- */
.skip-link {
  position: fixed;
  top: -100px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--accent);
  color: #fff;
  border-radius: 0 0 10px 10px;
  font-weight: 600;
  transition: top 0.2s var(--ease);
}

.skip-link:focus {
  top: 0;
}

/* ---------- 5. Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 22px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1;
  white-space: nowrap;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease), color 0.25s var(--ease);
}

.btn svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  transition: transform 0.25s var(--ease);
}

.btn-primary {
  background: var(--gradient);
  color: #fff;
  box-shadow: 0 12px 30px -12px var(--glow-a);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 38px -12px var(--glow-a);
}

.btn-primary:hover svg {
  transform: translateX(3px);
}

.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-ghost:hover {
  border-color: var(--border-2);
  background: var(--surface-2);
  transform: translateY(-2px);
}

/* Hero CTA — travelling arrow (View My Work) */
.hero-actions .btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 38px -12px var(--glow-a), 0 6px 18px -6px var(--glow-b);
}

.hero-actions .btn-primary .btn-arrow-track {
  position: relative;
  display: inline-block;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  overflow: hidden;
  pointer-events: none;
}

.hero-actions .btn-primary .btn-arrow-track .btn-arrow {
  position: absolute;
  top: 0;
  left: 0;
  width: 18px;
  height: 18px;
  will-change: transform;
  transition: transform 350ms cubic-bezier(0.22, 1, 0.36, 1);
}

.hero-actions .btn-primary .btn-arrow-track .btn-arrow--enter {
  transform: translateX(-100%);
}

.hero-actions .btn-primary:hover .btn-arrow-track .btn-arrow {
  transform: translateX(100%);
}

.hero-actions .btn-primary:hover .btn-arrow-track .btn-arrow--enter {
  transform: translateX(0);
}

.btn-block {
  width: 100%;
  justify-content: center;
}

/* ---------- 6. Icon buttons & socials ---------- */
.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  color: var(--text-2);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.icon-btn:hover {
  color: var(--text);
  border-color: var(--border-2);
  background: var(--surface-2);
}

.icon-btn svg {
  width: 20px;
  height: 20px;
}

.icon-btn:focus-visible {
  outline-offset: 2px;
}

.social-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  transition: transform 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.social-link:hover {
  transform: translateY(-3px);
  color: var(--text);
  border-color: var(--border-2);
  background: var(--surface-2);
}

.social-link svg {
  width: 20px;
  height: 20px;
}

/* ---------- 7. Animated background ---------- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 100%);
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 40%, transparent 100%);
}

html[data-theme='light'] .bg-grid {
  background-image:
    linear-gradient(rgba(17, 20, 42, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(17, 20, 42, 0.05) 1px, transparent 1px);
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  will-change: transform;
}

.bg-orb--a {
  width: 520px;
  height: 520px;
  top: -140px;
  left: -120px;
  background: radial-gradient(circle at center, var(--glow-a), transparent 70%);
  animation: orb-a 22s ease-in-out infinite alternate;
}

.bg-orb--b {
  width: 460px;
  height: 460px;
  top: 24%;
  right: -160px;
  background: radial-gradient(circle at center, var(--glow-b), transparent 70%);
  animation: orb-b 26s ease-in-out infinite alternate;
}

.bg-orb--c {
  width: 420px;
  height: 420px;
  bottom: -160px;
  left: 30%;
  background: radial-gradient(circle at center, rgba(167, 139, 250, 0.16), transparent 70%);
  animation: orb-c 30s ease-in-out infinite alternate;
}

@keyframes orb-a {
  to {
    transform: translate(60px, 50px) scale(1.08);
  }
}

@keyframes orb-b {
  to {
    transform: translate(-70px, -40px) scale(0.94);
  }
}

@keyframes orb-c {
  to {
    transform: translate(40px, -60px) scale(1.1);
  }
}

/* ---------- 8. Header / navigation ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--nav-h);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.site-header.is-scrolled {
  border-bottom-color: var(--border);
  background: color-mix(in srgb, var(--bg) 85%, transparent);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: var(--nav-h);
}

.brand {
  display: inline-flex;
  align-items: baseline;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.brand-mark {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-dot {
  color: var(--accent-2);
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  display: inline-block;
  padding: 9px 13px;
  border-radius: 10px;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--text-2);
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.nav-link:hover {
  color: var(--text);
  background: var(--surface);
}

.nav-link.is-active {
  color: var(--text);
  background: var(--surface-2);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* theme toggle icon swap */
.icon-moon {
  display: none;
}

html[data-theme='light'] .icon-sun {
  display: none;
}

html[data-theme='light'] .icon-moon {
  display: block;
}

/* mobile menu */
.menu-toggle {
  display: none;
}

.icon-close {
  display: none;
}

/* scroll progress bar */
.scroll-progress {
  position: absolute;
  bottom: -1px;
  left: 0;
  height: 2px;
  width: 0;
  background: var(--gradient);
  box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 45%, transparent);
  opacity: 0;
  transition: opacity 0.3s var(--ease);
  pointer-events: none;
  z-index: 3;
}

/* nav-link animated underline */
.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 13px;
  right: 13px;
  bottom: 5px;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.3s var(--ease);
  pointer-events: none;
}

.nav-link:hover::after,
.nav-link.is-active::after {
  transform: scaleX(1);
}

/* ---------- 9. Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-block: calc(var(--nav-h) + 40px) 56px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: clamp(32px, 5vw, 60px);
  align-items: center;
}

.availability {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.83rem;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 28px;
}

.availability-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.5);
  animation: pulse-dot 2.4s ease-in-out infinite;
}

@keyframes pulse-dot {
  0% {
    box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.45);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(52, 211, 153, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(52, 211, 153, 0);
  }
}

.hero-name {
  font-size: clamp(2.6rem, 7vw, 4.4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  background: linear-gradient(115deg, var(--text) 30%, var(--text-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-role {
  margin-top: 12px;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.6vw, 1.55rem);
  font-weight: 600;
  color: var(--text);
}

.hero-role-accent {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-tagline {
  margin-top: 18px;
  max-width: 480px;
  color: var(--text-2);
  font-size: clamp(1rem, 1.6vw, 1.1rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-socials {
  display: flex;
  gap: 12px;
  margin-top: 30px;
}

/* hero visual */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
}

.photo-frame {
  position: relative;
  width: min(420px, 76vw);
  aspect-ratio: 1;
  border-radius: 28px;
  padding: 10px;
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  position: relative;
}

.photo-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 28px;
  background: linear-gradient(140deg, var(--glow-a), transparent 55%);
  opacity: 0.6;
  pointer-events: none;
}

/* rotating premium ring (appears on hover, fine pointer / no reduced-motion handled globally) */
.photo-frame::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 2px;
  background: conic-gradient(from var(--ring-angle, 0deg),
      transparent 0 62%,
      color-mix(in srgb, var(--accent) 70%, transparent) 78%,
      color-mix(in srgb, var(--accent-2) 70%, transparent) 92%,
      transparent 100%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask-composite: exclude;
  opacity: 0;
  transition: opacity 0.5s var(--ease);
  pointer-events: none;
  z-index: 3;
}

@property --ring-angle {
  syntax: '<angle>';
  inherits: false;
  initial-value: 0deg;
}

.photo-frame:hover::before {
  opacity: 1;
  animation: ring-spin 7s linear infinite;
}

@keyframes ring-spin {
  to {
    --ring-angle: 360deg;
  }
}

/* hero scroll cue */
.hero-scroll {
  position: absolute;
  bottom: 26px;
  left: 50%;
  transform: translateX(-50%);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
  color: var(--muted);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  z-index: 2;
}

.hero-scroll:hover {
  color: var(--text-2);
}

.hero-scroll-line {
  display: block;
  position: relative;
  width: 1.5px;
  height: 42px;
  background: linear-gradient(var(--accent-2), transparent);
  overflow: hidden;
}

.hero-scroll-line::after {
  content: '';
  position: absolute;
  top: -60%;
  left: 0;
  width: 100%;
  height: 50%;
  background: #fff;
  animation: scroll-cue 2.2s var(--ease) infinite;
}

@keyframes scroll-cue {
  to {
    top: 110%;
  }
}

.photo {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 19px;
}

.photo-ring {
  position: absolute;
  inset: -1px;
  border-radius: 29px;
  border: 1px solid var(--border-2);
  z-index: 1;
  pointer-events: none;
}

.float-chip {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 9px 14px;
  border-radius: 12px;
  background: color-mix(in srgb, var(--bg-2) 78%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  font-size: 0.83rem;
  font-weight: 600;
  color: var(--text);
  z-index: 2;
  animation: float-y 6s ease-in-out infinite;
}

.float-chip--a {
  top: 12%;
  left: -6%;
}

.float-chip--b {
  bottom: 14%;
  right: -4%;
  animation-delay: -3s;
}

.chip-icon {
  width: 22px;
  height: 22px;
  border-radius: 7px;
  flex-shrink: 0;
}

.chip-icon--mern {
  background: var(--gradient);
}

.chip-icon--ai {
  background: linear-gradient(120deg, var(--accent-3), var(--accent));
}

@keyframes float-y {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

/* ---------- 10. Reveal animation ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: var(--d, 0s);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 11. About ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: var(--gap);
  align-items: stretch;
}

.about-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(26px, 4vw, 40px);
  backdrop-filter: blur(8px);
}

.about-lead {
  font-family: var(--font-display);
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 18px;
  background: linear-gradient(120deg, var(--text), var(--text-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.about-text {
  color: var(--text-2);
  margin-bottom: 14px;
  font-size: 0.98rem;
}

.about-meta {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.about-facts {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.about-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 22px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.about-facts li:hover {
  border-color: var(--border-2);
  transform: translateX(4px);
}

.fact-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.fact-value {
  color: var(--text);
  font-weight: 500;
  font-size: 0.95rem;
}

/* about focus-area chips */
.about-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 10px;
  margin-top: 22px;
}

.about-chips li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-2);
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease),
    transform 0.25s var(--ease), background-color 0.25s var(--ease);
}

.about-chips li::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gradient);
  flex: none;
}

.about-chips li:hover {
  color: var(--text);
  border-color: var(--border-2);
  background: var(--surface-3);
  transform: translateY(-2px);
}

/* ---------- 12. Skills ---------- */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

.skill-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), background-color 0.3s var(--ease);
  backdrop-filter: blur(8px);
}

.skill-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  background: var(--surface-2);
}

.skill-card-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 18px;
}

.skill-card-title::before {
  content: '';
  width: 10px;
  height: 10px;
  border-radius: 3px;
  background: var(--gradient);
  transform: rotate(45deg);
}

.skill-tiles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(88px, 1fr));
  gap: 10px;
}

.skill-tile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 14px 8px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid transparent;
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.skill-tile:hover {
  border-color: var(--border);
  background: var(--surface-2);
  transform: translateY(-3px);
}

.skill-tile-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  border-radius: 13px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--surface-3);
  border: 1px solid var(--border);
  letter-spacing: -0.02em;
}

.skill-tile-name {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-2);
  text-align: center;
  line-height: 1.25;
}

/* skills category filter */
.skills-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 26px;
}

.skills-filter[hidden] {
  display: none;
}

.sf-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  font-size: 0.82rem;
  font-weight: 600;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease),
    background-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.sf-btn::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gradient);
  opacity: 0.6;
  transition: opacity 0.25s var(--ease);
}

.sf-btn:hover {
  color: var(--text);
  border-color: var(--border-2);
  transform: translateY(-2px);
}

.sf-btn.is-active {
  background: var(--gradient);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 10px 24px -10px var(--glow-a);
}

.sf-btn.is-active::before {
  opacity: 1;
}

.skill-card.is-filtered {
  display: none;
}

/* ---------- 13. Projects ---------- */
.modal-hint {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 22px;
}

.modal-hint::before {
  content: '';
  width: 16px;
  height: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2372758c' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M18 6 6 18M6 6l12 12'/%3E%3C/svg%3E");
  background-size: contain;
}

.projects-list {
  display: flex;
  flex-direction: column;
  gap: 26px;
}

.projects-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 26px;
}

@media (max-width: 768px) {
  .projects-grid {
    grid-template-columns: 1fr;
  }
}

.project-card {
  position: relative;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: clamp(24px, 3vw, 32px);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.project-card:hover {
  transform: translateY(-5px);
  border-color: var(--border-2);
  box-shadow: var(--shadow-md);
}

.project-badge {
  display: inline-flex;
  align-self: flex-start;
  padding: 6px 13px;
  border-radius: var(--radius-pill);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  background: var(--gradient);
  color: #fff;
  margin-bottom: 16px;
}

.project-name {
  font-size: clamp(1.4rem, 2.4vw, 1.7rem);
  font-weight: 700;
}

.project-subtitle {
  margin-top: 4px;
  font-size: 0.95rem;
  color: var(--muted);
  font-weight: 500;
}

.project-desc {
  margin-top: 16px;
  color: var(--text-2);
  font-size: 0.97rem;
  max-width: 54ch;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 18px;
}

.project-tag {
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  border: 1px solid var(--border);
  font-size: 0.76rem;
  font-weight: 500;
  color: var(--text-2);
}

.project-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: auto;
  padding-top: 24px;
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border-2);
}

.btn-outline:hover {
  background: var(--surface-2);
  transform: translateY(-2px);
}

.btn-gh {
  gap: 8px;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.btn-gh-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  transition: transform .3s cubic-bezier(.34,1.56,.64,1);
}

.btn-gh-arrow {
  display: inline-block;
  transition: transform .3s cubic-bezier(.34,1.56,.64,1);
}

.btn-gh:hover .btn-gh-icon {
  transform: rotate(-8deg) scale(1.15);
}

.btn-gh:hover .btn-gh-arrow {
  transform: translate(3px, -3px);
}

.btn-gh::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient);
  opacity: 0;
  transition: opacity .3s ease;
  z-index: -1;
}

.btn-gh:hover::after {
  opacity: .08;
}

/* ---------- 14. Modal ---------- */
.modal {
  border: 0;
  background: transparent;
  padding: 0;
  width: 100%;
  max-width: 760px;
  margin: auto;
  overflow: visible;
}

.modal::backdrop {
  background: rgba(2, 4, 10, 0.72);
  backdrop-filter: blur(6px);
}

html[data-theme='light'] .modal::backdrop {
  background: rgba(240, 242, 250, 0.7);
}

.modal[open] {
  animation: modal-in 0.35s var(--ease);
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: translateY(24px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.modal-shell {
  position: relative;
  max-height: min(84vh, 760px);
  overflow-y: auto;
  border-radius: var(--radius-lg);
  background: var(--bg-2);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.modal-close {
  position: sticky;
  top: 16px;
  margin-left: calc(100% - 58px);
  z-index: 3;
  background: var(--surface-3);
}

.modal-content {
  padding: clamp(20px, 4vw, 40px);
  padding-top: 8px;
}

.modal-header .project-badge {
  margin-bottom: 12px;
}

.modal-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.modal-subtitle {
  color: var(--muted);
  font-size: 0.92rem;
  margin-top: 4px;
}

.modal-section {
  margin-top: 26px;
}

.modal-section-title {
  font-size: 0.95rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 10px;
}

.modal-section-title::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--gradient);
  transform: rotate(45deg);
}

.modal-text {
  color: var(--text-2);
  font-size: 0.94rem;
}

.modal-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 9px;
}

.modal-features li {
  display: flex;
  gap: 9px;
  font-size: 0.88rem;
  color: var(--text-2);
}

.modal-features li::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--gradient);
  flex: none;
  transform: translateY(4px);
}

.modal-tech {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.modal-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

/* ---------- 15. Timeline ---------- */
.timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-left: 34px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 9px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(var(--accent), var(--accent-2), transparent);
  opacity: 0.35;
}

.timeline-item {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px 24px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background-color 0.25s var(--ease);
}

.timeline-item:hover {
  transform: translateX(4px);
  border-color: var(--border-2);
  background: var(--surface-2);
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -30px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 3px solid var(--accent-2);
  box-shadow: 0 0 0 4px var(--glow-b);
}

.timeline-tag {
  display: inline-flex;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--surface-3);
  border: 1px solid var(--border);
  color: var(--accent-2);
  margin-bottom: 10px;
}

.timeline-title {
  font-size: 1.06rem;
  font-weight: 600;
}

.timeline-org {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 2px;
}

.timeline-desc {
  color: var(--text-2);
  font-size: 0.9rem;
  margin-top: 10px;
}

.timeline-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 14px;
}

.timeline-tags li {
  font-size: 0.72rem;
  color: var(--muted);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  background: var(--surface);
  border: 1px solid var(--border);
}

/* ---------- 16. Education ---------- */
.education-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

.edu-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background-color 0.25s var(--ease);
}

.edu-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  background: var(--surface-2);
}

.edu-icon {
  width: 46px;
  height: 46px;
  border-radius: 13px;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-2);
  margin-bottom: 8px;
}

.edu-icon svg {
  width: 22px;
  height: 22px;
}

.edu-degree {
  font-size: 1.08rem;
  font-weight: 600;
}

.edu-field {
  color: var(--text-2);
  font-size: 0.85rem;
}

.edu-detail {
  margin-top: auto;
  padding-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.edu-chip {
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.76rem;
  font-weight: 600;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-2);
}

.edu-chip--accent {
  background: var(--gradient-soft);
  color: var(--text);
}

/* ---------- 17. Certificates ---------- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap);
  align-items: stretch;
}

/* premium glass card: index + name + provider + arrow only */
.cert-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 18px;
  min-height: 132px;
  padding: 22px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg,
      color-mix(in srgb, var(--surface-2) 92%, var(--surface-3)),
      var(--surface));
  border: 1px solid var(--border);
  color: var(--text);
  text-decoration: none;
  box-shadow: 0 16px 38px -28px rgba(0, 0, 0, 0.6);
  overflow: hidden;
}

.cert-card.is-clickable {
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}

/* gradient hairline border (fades in on hover) */
.cert-card::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg,
      color-mix(in srgb, var(--accent) 60%, transparent),
      color-mix(in srgb, var(--accent-2) 30%, transparent) 45%,
      transparent 75%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}

/* light sweep (shine) crossing the card on hover */
.cert-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 55%;
  height: 100%;
  background: linear-gradient(105deg,
      transparent 32%,
      rgba(255, 255, 255, 0.05) 46%,
      rgba(255, 255, 255, 0.1) 52%,
      transparent 66%);
  transform: translateX(-160%) skewX(-12deg);
  pointer-events: none;
  opacity: 0;
  transition: transform 0.9s var(--ease), opacity 0.35s var(--ease);
}

/* entrance: fade + slide up, staggered per card via --d (transform/opacity only) */
.cert-card[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  will-change: transform, opacity;
  transition: opacity 0.55s var(--ease), transform 0.55s var(--ease),
    border-color 0.4s var(--ease), background-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
  transition-delay: var(--d, 0ms);
}

.cert-card[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* hover / focus: gentle lift, subtle scale, accent border + soft glow */
.cert-card[data-reveal].is-revealed.is-clickable:hover,
.cert-card[data-reveal].is-revealed.is-clickable:focus-visible {
  transform: translateY(-6px) scale(1.012);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border-2));
  background-color: var(--surface-2);
  box-shadow: 0 24px 52px -24px var(--glow-a), 0 10px 26px -18px var(--glow-b);
  transition-duration: 0.34s, 0.34s, 0.34s, 0.34s, 0.34s;
  transition-delay: 0ms;
}

.cert-card[data-reveal].is-revealed.is-clickable:hover::after,
.cert-card[data-reveal].is-revealed.is-clickable:focus-visible::after {
  opacity: 1;
}

.cert-card[data-reveal].is-revealed.is-clickable:hover::before,
.cert-card[data-reveal].is-revealed.is-clickable:focus-visible::before {
  opacity: 1;
  transform: translateX(230%) skewX(-12deg);
}

/* press feedback */
.cert-card[data-reveal].is-revealed.is-clickable:active {
  transform: scale(0.988);
  box-shadow: none;
  transition-duration: 0.12s, 0.12s, 0.12s, 0.12s, 0.12s;
  transition-delay: 0ms;
}

/* keyboard focus ring */
.cert-card:focus-visible {
  outline: 2px solid color-mix(in srgb, var(--accent) 65%, transparent);
  outline-offset: 3px;
}

/* animated index badge (01, 02, …) */
.cert-index {
  flex: none;
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--text-2);
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  transition: transform 0.34s var(--ease), color 0.34s var(--ease),
    border-color 0.34s var(--ease), box-shadow 0.34s var(--ease);
}

.cert-card-body {
  position: relative;
  z-index: 1;
  flex: 1 1 auto;
  min-width: 0;
}

.cert-title {
  margin: 0;
  font-size: clamp(0.98rem, 1.15vw, 1.08rem);
  font-weight: 600;
  line-height: 1.35;
  color: var(--text);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color 0.34s var(--ease);
}

.cert-provider {
  margin: 6px 0 0;
  font-size: 0.86rem;
  letter-spacing: 0.01em;
  color: var(--muted);
  transition: color 0.34s var(--ease);
}

.cert-arrow {
  position: relative;
  z-index: 1;
  flex: none;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  color: var(--text-2);
  background: var(--surface-2);
  border: 1px solid var(--border);
  transition: transform 0.34s var(--ease), color 0.34s var(--ease),
    background-color 0.34s var(--ease), border-color 0.34s var(--ease), box-shadow 0.34s var(--ease);
}

.cert-arrow svg {
  width: 18px;
  height: 18px;
}

/* hover state transitions for content (no bounce) */
.cert-card[data-reveal].is-revealed.is-clickable:hover .cert-index,
.cert-card[data-reveal].is-revealed.is-clickable:focus-visible .cert-index {
  transform: translateY(-2px) scale(1.05);
  color: var(--accent-2);
  border-color: color-mix(in srgb, var(--accent) 45%, var(--border-2));
  box-shadow: 0 10px 24px -12px var(--glow-b);
}

.cert-card[data-reveal].is-revealed.is-clickable:hover .cert-title,
.cert-card[data-reveal].is-revealed.is-clickable:focus-visible .cert-title {
  color: #fff;
}

.cert-card[data-reveal].is-revealed.is-clickable:hover .cert-provider,
.cert-card[data-reveal].is-revealed.is-clickable:focus-visible .cert-provider {
  color: var(--text-2);
}

.cert-card[data-reveal].is-revealed.is-clickable:hover .cert-arrow,
.cert-card[data-reveal].is-revealed.is-clickable:focus-visible .cert-arrow {
  transform: translateX(7px);
  color: #fff;
  background: var(--gradient);
  border-color: transparent;
  box-shadow: 0 10px 22px -12px var(--glow-a);
}

.cert-empty {
  grid-column: 1 / -1;
  text-align: center;
  color: var(--muted);
  padding: 28px 0;
}

/* ---------- certificates toolbar (search + filters) ---------- */
.cert-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 16px;
  margin-bottom: 28px;
}

.cert-search {
  position: relative;
  flex: 1 1 280px;
  max-width: 420px;
}

.cert-search-icon {
  position: absolute;
  left: 13px;
  top: 50%;
  transform: translateY(-50%);
  display: inline-flex;
  color: var(--muted);
  pointer-events: none;
}

.cert-search-icon svg {
  width: 16px;
  height: 16px;
}

.cert-search-input {
  width: 100%;
  padding: 11px 14px 11px 40px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.88rem;
  font-family: inherit;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease), background-color 0.25s var(--ease);
}

.cert-search-input::placeholder {
  color: var(--muted);
}

.cert-search-input:focus {
  outline: none;
  border-color: color-mix(in srgb, var(--accent) 55%, var(--border-2));
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent);
  background: var(--surface-2);
}

.cert-search-input::-webkit-search-cancel-button {
  cursor: pointer;
}

.cert-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.cert-f-btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  font-family: inherit;
  color: var(--text-2);
  font-size: 0.78rem;
  font-weight: 600;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease),
    background-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.cert-f-btn::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--gradient);
  opacity: 0.55;
  transition: opacity 0.25s var(--ease);
}

.cert-f-btn:hover {
  color: var(--text);
  border-color: var(--border-2);
  transform: translateY(-2px);
}

.cert-f-btn.is-active {
  background: var(--gradient);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 10px 22px -12px var(--glow-a);
}

.cert-f-btn.is-active::before {
  opacity: 1;
}

.cert-verify {
  flex-basis: 100%;
  color: var(--muted);
  font-size: 0.84rem;
  margin: 0;
}

.cert-verify[hidden] {
  display: none;
}

.cert-reset {
  border: 0;
  background: none;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 6px 4px;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.25s var(--ease);
}

.cert-reset[hidden] {
  display: none;
}

.cert-reset:hover {
  color: var(--text);
}

/* compact section variant (smaller bands like "Currently Learning") */
.section--compact {
  padding-block: clamp(48px, 7vh, 84px);
}

/* ---------- 17b. Currently learning ---------- */
.learning-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.learning-chip {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--surface);
  border: 1px solid var(--border);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-2);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease),
    background-color 0.25s var(--ease), color 0.25s var(--ease);
}

.learning-chip::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gradient);
  flex: none;
  box-shadow: 0 0 10px color-mix(in srgb, var(--accent) 55%, transparent);
}

.learning-chip:hover {
  transform: translateY(-3px);
  border-color: var(--border-2);
  background: var(--surface-2);
  color: var(--text);
}

/* ---------- 17c. How I build ---------- */
.process-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--gap);
}

.process-step {
  position: relative;
  padding: clamp(22px, 3vw, 30px);
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  overflow: hidden;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease),
    box-shadow 0.35s var(--ease), background-color 0.35s var(--ease);
}

.process-step::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(300px circle at 80% 0%,
      color-mix(in srgb, var(--accent) 13%, transparent), transparent 60%);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  pointer-events: none;
}

.process-step:hover {
  transform: translateY(-5px);
  border-color: var(--border-2);
  background: var(--surface-2);
  box-shadow: var(--shadow-md);
}

.process-step:hover::before {
  opacity: 1;
}

.process-num {
  display: inline-flex;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent-2);
  margin-bottom: 18px;
}

.process-num::after {
  content: '';
  width: 26px;
  height: 1px;
  margin-left: 10px;
  background: var(--gradient);
  opacity: 0.6;
}

.process-title {
  font-size: 1.12rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.process-desc {
  color: var(--text-2);
  font-size: 0.9rem;
}

/* ---------- 18. GitHub section ---------- */
.github-card {
  position: relative;
  overflow: hidden;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(18px, 3vw, 32px);
  align-items: center;
  padding: clamp(28px, 4vw, 44px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface);
  backdrop-filter: blur(8px);
}

.github-card-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(600px 220px at 8% 0%, var(--glow-a), transparent 65%);
  opacity: 0.7;
  pointer-events: none;
}

.github-card-icon {
  position: relative;
  width: clamp(72px, 8vw, 96px);
  height: clamp(72px, 8vw, 96px);
  border-radius: 24px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text);
}

.github-card-icon svg {
  width: 44%;
  height: 44%;
}

.github-card-body {
  position: relative;
}

.github-card-kicker {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.github-card-title {
  font-size: clamp(1.4rem, 2.6vw, 1.9rem);
  margin-top: 6px;
  font-weight: 700;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.github-card-text {
  color: var(--text-2);
  font-size: 0.95rem;
  margin-top: 10px;
  max-width: 52ch;
}

.github-links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 22px;
}

.github-stat {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-2);
}

.github-stat[hidden] {
  display: none;
}

/* ---------- 19. Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.contact-info-text {
  color: var(--text-2);
  font-size: 0.98rem;
  margin-bottom: 26px;
  max-width: 44ch;
}

.contact-row {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  margin-bottom: 12px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), background-color 0.25s var(--ease);
}

.contact-row:hover {
  transform: translateX(4px);
  border-color: var(--border-2);
  background: var(--surface-2);
}

.contact-row-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  flex: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--gradient-soft);
  border: 1px solid var(--border);
  color: var(--accent-2);
}

.contact-row-icon svg {
  width: 20px;
  height: 20px;
}

.contact-row-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.contact-row-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.contact-row-value {
  font-weight: 500;
  color: var(--text);
  font-size: 0.93rem;
  overflow-wrap: break-word;
}

/* form */
.contact-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(24px, 3.6vw, 36px);
  backdrop-filter: blur(8px);
}

.field {
  margin-bottom: 18px;
}

.field-label {
  display: block;
  font-size: 0.83rem;
  font-weight: 600;
  margin-bottom: 8px;
  color: var(--text-2);
}

.field-label::after {
  content: ' *';
  color: var(--accent-2);
}

.field-input {
  width: 100%;
  padding: 13px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font: inherit;
  font-size: 0.95rem;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease);
  resize: vertical;
}

.field-input::placeholder {
  color: var(--muted);
}

.field-input:focus {
  outline: none;
  border-color: var(--accent-2);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent-2) 18%, transparent);
}

.field-input.is-invalid {
  border-color: #f87171;
}

.field-error {
  margin-top: 6px;
  font-size: 0.8rem;
  color: #f87171;
}

.form-status {
  min-height: 1.2em;
  margin-top: 16px;
  font-size: 0.9rem;
  color: var(--text-2);
}

.form-status.is-error {
  color: #f87171;
}

.form-status.is-success {
  color: #34d399;
}

.form-status.is-error,
.form-status.is-success {
  animation: status-pop 0.4s var(--ease);
}

@keyframes status-pop {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.field-input.is-invalid {
  animation: field-shake 0.35s var(--ease-quick);
}

@keyframes field-shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
}

/* button loading state */
.btn.is-loading {
  pointer-events: none;
  opacity: 0.85;
}

.btn:disabled {
  cursor: not-allowed;
  box-shadow: none;
}

.btn-spinner {
  display: none;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  border: 2.5px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  animation: spin 0.7s linear infinite;
}

.btn.is-loading .btn-spinner {
  display: block;
}

.btn.is-loading svg {
  display: none;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ---------- 20. Footer ---------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 48px 32px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  text-align: center;
}

.footer-name {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
}

.footer-role {
  color: var(--muted);
  font-size: 0.88rem;
}

.footer-socials {
  display: flex;
  gap: 12px;
}

.footer-copy {
  color: var(--muted);
  font-size: 0.82rem;
}

/* ---------- 21. Toast ---------- */
.toast {
  position: fixed;
  bottom: 26px;
  left: 50%;
  transform: translate(-50%, 120%);
  z-index: 300;
  max-width: min(420px, calc(100vw - 32px));
  padding: 14px 20px;
  border-radius: 14px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  color: var(--text);
  transition: transform 0.4s var(--ease);
  text-align: center;
}

.toast.is-visible {
  transform: translate(-50%, 0);
}

.toast.is-error {
  border-color: rgba(248, 113, 113, 0.5);
}

/* ---------- 22. Reveal helpers & misc ---------- */
[hidden] {
  display: none !important;
}

/* ==========================================================================
   23. Premium motion (2026) — Apple × Vercel inspired
   ========================================================================== */

/* light, purposeful reveal variants */
[data-reveal='left'] {
  transform: translateX(-34px);
}

[data-reveal='right'] {
  transform: translateX(34px);
}

[data-reveal='zoom'] {
  transform: scale(0.94);
}

[data-reveal='blur'] {
  transform: translateY(16px);
  filter: blur(7px);
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
  filter: none;
}

/* ---- hero entrance polish ---- */
.hero-copy {
  position: relative;
}

.hero-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 640px;
  height: 640px;
  border-radius: 50%;
  background: radial-gradient(circle at center, color-mix(in srgb, var(--accent) 13%, transparent), transparent 66%);
  z-index: -1;
  pointer-events: none;
  will-change: transform;
  mix-blend-mode: screen;
  opacity: 0;
}

@media (hover: hover) and (pointer: fine) {
  .hero-glow {
    opacity: 1;
  }
}

@media (hover: none), (pointer: coarse) {
  .hero-glow {
    display: none;
  }
}

/* subtle photo float */
.photo-frame {
  animation: photo-float 8s ease-in-out infinite;
  transition: border-color 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.photo-frame:hover {
  border-color: var(--border-2);
  box-shadow: var(--shadow-lg), 0 0 60px -18px var(--glow-a);
}

@keyframes photo-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

/* slow background grid drift */
.bg-grid {
  will-change: transform;
}

/* ---- CTA buttons ---- */
.btn {
  overflow: hidden;
  position: relative;
}

.btn-primary {
  background-image: var(--gradient);
  background-size: 200% 200%;
  background-position: 0% 50%;
  transition: transform 0.25s var(--ease), background-position 0.5s var(--ease),
    box-shadow 0.25s var(--ease), border-color 0.25s var(--ease),
    background-color 0.25s var(--ease), color 0.25s var(--ease);
}

.btn-primary:hover {
  background-position: 96% 50%;
  box-shadow: 0 18px 44px -16px var(--glow-a);
}

.btn-primary::after {
  content: '';
  position: absolute;
  top: 0;
  left: -70%;
  width: 42%;
  height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.35), transparent);
  transform: skewX(-22deg) translateX(0);
  opacity: 0;
  pointer-events: none;
}

.btn-primary:hover::after {
  opacity: 1;
  transform: skewX(-22deg) translateX(480%);
  transition: transform 0.75s var(--ease), opacity 0.2s;
}

/* lift for hero primary CTA (keeps travelling arrow intact) */
.hero-actions .btn-primary:hover {
  transform: translateY(-2px);
}

/* download (and link) icons nudge on hover */
.btn-ghost:hover svg,
.btn-outline:hover svg {
  transform: translateY(3px);
}

.btn-outline {
  transition: transform 0.25s var(--ease), background-color 0.25s var(--ease),
    border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.btn-outline:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-sm);
}

/* ---- navigation polish ---- */
.nav-list {
  position: relative;
}

.nav-indicator {
  position: absolute;
  bottom: 3px;
  left: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--gradient);
  box-shadow: 0 0 12px color-mix(in srgb, var(--accent) 55%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.45s var(--ease), width 0.45s var(--ease), opacity 0.3s var(--ease);
  z-index: 0;
}

.site-header.is-scrolled {
  box-shadow: 0 10px 34px -22px rgba(0, 0, 0, 0.6);
}

/* ---- about ---- */
.about-card {
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease),
    box-shadow 0.35s var(--ease), background-color 0.35s var(--ease);
}

.about-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  box-shadow: var(--shadow-md);
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--gap);
  margin-top: clamp(34px, 5vw, 52px);
}

.stat {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: baseline;
  gap: 2px 6px;
  padding: 22px 18px;
  border-radius: var(--radius);
  background: var(--surface);
  border: 1px solid var(--border);
  text-align: center;
  backdrop-filter: blur(8px);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.stat:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  background: var(--surface-2);
}

.stat-num {
  order: 1;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.6vw, 2.6rem);
  font-weight: 700;
  line-height: 1.05;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.stat-suffix {
  order: 2;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--accent-2);
}

.stat-label {
  order: 3;
  width: 100%;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* ---- skills ---- */
.skill-tile-icon {
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease),
    background-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.skill-tile:hover .skill-tile-icon {
  transform: translateY(-3px) scale(1.07);
  border-color: color-mix(in srgb, currentColor 48%, transparent);
  box-shadow: 0 10px 22px -10px color-mix(in srgb, currentColor 45%, transparent);
  background: color-mix(in srgb, currentColor 10%, transparent);
}

.skill-tile:hover .skill-tile-name {
  color: var(--text);
}

.skill-tile-name {
  transition: color 0.25s var(--ease);
}

/* ---- projects ---- */
.project-card {
  transform-style: preserve-3d;
  will-change: transform;
  transition: transform 0.45s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.project-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(420px circle at var(--gx, 50%) var(--gy, 0%),
      color-mix(in srgb, var(--accent) 13%, transparent), transparent 62%);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  z-index: 1;
}

.project-card > * {
  position: relative;
  z-index: 2;
}

.project-card:hover {
  transform: perspective(1000px) rotateX(var(--rx, 0deg)) rotateY(var(--ry, 0deg)) translateY(-6px);
  border-color: color-mix(in srgb, var(--accent) 34%, var(--border));
  box-shadow: 0 28px 64px -28px var(--glow-a);
}

.project-card:hover::before {
  opacity: 1;
}

/* project index watermark */
.project-index {
  position: absolute;
  top: 18px;
  right: 22px;
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  color: color-mix(in srgb, var(--text) 13%, transparent);
  pointer-events: none;
  user-select: none;
  transition: color 0.4s var(--ease), transform 0.4s var(--ease);
}

.project-card:hover .project-index {
  color: color-mix(in srgb, var(--accent) 22%, transparent);
  transform: translateY(-3px);
}

.project-badge {
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.project-card:hover .project-badge {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px -10px var(--glow-a);
}

.project-tag {
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease),
    color 0.25s var(--ease), transform 0.25s var(--ease);
}

.project-card:hover .project-tag {
  transform: translateY(-1px);
  border-color: var(--border-2);
}

.project-tag:hover {
  color: var(--text);
  background: var(--surface-3);
  transform: translateY(-2px);
}

/* GitHub button hover polish */
.btn-gh:hover {
  color: var(--text);
  border-color: color-mix(in srgb, var(--accent) 50%, var(--border-2));
  box-shadow: 0 10px 22px -12px var(--glow-a);
  background: color-mix(in srgb, var(--accent) 8%, var(--surface-2));
}

/* ---- AI / RAG project card ---- */
.project-card--ai {
  --ai-a: #a78bfa;
  --ai-b: #22d3ee;
}

.project-ai-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  align-self: flex-start;
  margin-bottom: 16px;
  padding: 5px 12px;
  border-radius: var(--radius-pill);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--accent-3);
  border: 1px solid color-mix(in srgb, var(--ai-b) 45%, transparent);
  background: linear-gradient(120deg, color-mix(in srgb, var(--ai-a) 14%, transparent), color-mix(in srgb, var(--ai-b) 14%, transparent));
}

.project-ai-chip-icon {
  width: 13px;
  height: 13px;
  flex: none;
  color: var(--ai-b);
  animation: ai-chip-spin 6s linear infinite;
}

@keyframes ai-chip-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@media (prefers-reduced-motion: reduce) {
  .project-ai-chip-icon {
    animation: none;
  }
}

/* ---- timeline ---- */
.timeline::before {
  transform: scaleY(var(--tl-progress, 0));
  transform-origin: top;
  opacity: 0.85;
  transition: transform 0.12s linear;
}

.timeline-item::before {
  transform: scale(0.45);
  opacity: 0.35;
  transition: transform 0.45s var(--ease), opacity 0.45s var(--ease),
    box-shadow 0.45s var(--ease), border-color 0.45s var(--ease);
}

.timeline-item.is-revealed::before {
  transform: scale(1);
  opacity: 1;
  border-color: var(--accent-2);
  box-shadow: 0 0 0 6px color-mix(in srgb, var(--accent-2) 22%, transparent),
    0 0 20px 2px var(--glow-b);
}

/* ---- education ---- */
.edu-card {
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease),
    box-shadow 0.35s var(--ease), background-color 0.35s var(--ease);
}

.edu-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.edu-icon {
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.edu-card:hover .edu-icon {
  transform: translateY(-2px) scale(1.06);
  border-color: color-mix(in srgb, var(--accent-2) 40%, transparent);
  box-shadow: 0 10px 22px -10px var(--glow-b);
}

/* ---- github card ---- */
.github-card {
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease),
    box-shadow 0.35s var(--ease), background-color 0.35s var(--ease);
}

.github-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-2);
  box-shadow: var(--shadow-lg);
}

.github-card-glow {
  transition: opacity 0.4s var(--ease);
}

.github-card:hover .github-card-glow {
  opacity: 1;
}

/* ---- contact ---- */
.field:focus-within .field-label {
  color: var(--accent-2);
}

.field-label {
  transition: color 0.25s var(--ease);
}

.field-input {
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease),
    background-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.field-input:focus {
  transform: translateY(-1px);
}

.contact-row-icon {
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.contact-row:hover .contact-row-icon {
  transform: scale(1.07);
  border-color: color-mix(in srgb, var(--accent-2) 45%, transparent);
  box-shadow: 0 8px 20px -10px var(--glow-b);
}

.contact-row {
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease),
    background-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.contact-row:hover {
  box-shadow: var(--shadow-sm);
}

/* ---- micro interactions ---- */
.social-link svg {
  transition: transform 0.25s var(--ease);
}

.social-link:hover svg {
  transform: translateY(-2px) scale(1.08);
}

.icon-btn svg {
  transition: transform 0.3s var(--ease);
}

.icon-btn:hover svg {
  transform: scale(1.08);
}

/* subtle press feedback on all buttons */
.btn:active {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
}

.photo {
  transition: transform 0.6s var(--ease);
}

.photo-frame:hover .photo {
  transform: scale(1.02);
}

/* ---- custom cursor (desktop, fine pointer only) ---- */
.cursor-dot,
.cursor-ring {
  display: none;
}

.has-cursor .cursor-dot,
.has-cursor .cursor-ring {
  display: block;
}

.cursor-dot {
  position: fixed;
  top: 0;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 14px color-mix(in srgb, var(--accent-2) 70%, transparent);
  pointer-events: none;
  z-index: 1200;
  opacity: 0;
  transition: opacity 0.25s, background-color 0.25s;
  will-change: transform;
  mix-blend-mode: screen;
}

.cursor-ring {
  position: fixed;
  top: 0;
  left: 0;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: 1px solid color-mix(in srgb, var(--accent) 30%, transparent);
  background: radial-gradient(circle at center, color-mix(in srgb, var(--accent) 10%, transparent), transparent 64%);
  pointer-events: none;
  z-index: 1199;
  opacity: 0.8;
  transition: opacity 0.3s, border-color 0.3s, width 0.3s var(--ease), height 0.3s var(--ease);
  will-change: transform;
  mix-blend-mode: screen;
}

.cursor-ring.is-hover {
  width: 62px;
  height: 62px;
  border-color: color-mix(in srgb, var(--accent-2) 45%, transparent);
}

.cursor-dot.is-hover {
  background: var(--accent);
}

/* ==========================================================================
   Responsive
   ========================================================================== */
@media (max-width: 1024px) {
  .skills-grid,
  .education-grid,
  .cert-grid,
  .process-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .hero-visual {
    order: 2;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 991.98px) {
  /* mobile-style navigation kicks in earlier so the 8-link navbar never overflows */
  .menu-toggle {
    display: inline-flex;
  }

  .nav {
    position: fixed;
    inset: var(--nav-h) 0 auto 0;
    background: color-mix(in srgb, var(--bg) 94%, transparent);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 14px 20px 24px;
    transform: translateY(-16px);
    opacity: 0;
    pointer-events: none;
    transition: transform 0.35s var(--ease), opacity 0.35s var(--ease);
  }

  .nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    padding: 12px 14px;
    font-size: 1rem;
  }

  .menu-toggle[aria-expanded='true'] .icon-menu {
    display: none;
  }

  .menu-toggle[aria-expanded='true'] .icon-close {
    display: block;
  }

  .nav-indicator {
    display: none;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-h: 64px;
  }

  .skills-grid,
  .education-grid,
  .cert-grid,
  .process-grid {
    grid-template-columns: 1fr;
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero-glow {
    display: none;
  }

  .hero-scroll {
    display: none;
  }

  .modal-features {
    grid-template-columns: 1fr;
  }

  .github-card {
    grid-template-columns: 1fr;
    text-align: center;
  }

  .github-card-icon {
    margin-inline: auto;
  }

  .github-links {
    justify-content: center;
  }

  .float-chip--a {
    left: 0;
  }

  .float-chip--b {
    right: 0;
  }

  .hero {
    min-height: auto;
  }
}

/* certificates: 2 columns on tablet (1 column below 768px) */
@media (min-width: 769px) and (max-width: 1149.98px) {
  .cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* focus visibility for certificate controls (keyboard navigation) */
.cert-f-btn:focus-visible,
.cert-reset:focus-visible,
.cert-search-input:focus-visible {
  outline: 2px solid var(--accent-2);
  outline-offset: 3px;
}

@media (max-width: 420px) {
  .btn {
    padding: 12px 18px;
    font-size: 0.9rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-actions .btn {
    justify-content: center;
  }

  .photo-frame {
    width: min(320px, 82vw);
  }
}

@media (max-width: 480px) {
  .projects-grid {
    gap: 18px;
  }

  .project-card {
    padding: 22px;
  }

  .project-index {
    top: 14px;
    right: 18px;
    font-size: 2.1rem;
  }

  .process-grid {
    gap: 16px;
  }

  .about-stats {
    gap: 12px;
  }

.skills-filter {
    gap: 8px;
  }

  /* certificates: mobile refinements */
  .cert-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .cert-search {
    max-width: none;
  }

  .cert-filters {
    gap: 7px;
  }

  .cert-f-btn {
    padding: 7px 12px;
    font-size: 0.74rem;
  }

  .cert-card {
    gap: 14px;
    padding: 18px;
    min-height: 112px;
  }

  .cert-index {
    width: 40px;
    height: 40px;
    font-size: 0.92rem;
  }

  .cert-arrow {
    width: 36px;
    height: 36px;
  }

  .sf-btn {
    padding: 7px 13px;
    font-size: 0.78rem;
  }
}

@media (max-width: 360px) {
  .btn {
    padding: 11px 14px;
    font-size: 0.86rem;
  }

  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }

  .project-actions .btn {
    flex: 1 1 100%;
    justify-content: center;
  }

  .about-chips {
    gap: 7px;
  }

  .learning-chip {
    padding: 8px 14px;
    font-size: 0.84rem;
  }
}

/* ==========================================================================
   Accessibility — reduced motion
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001s !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
    filter: none;
  }

  .cert-card::before,
  .cert-card::after {
    display: none;
  }

  .hero-actions .btn-primary .btn-arrow-track .btn-arrow,
  .hero-actions .btn-primary:hover .btn-arrow-track .btn-arrow,
  .hero-actions .btn-primary .btn-arrow-track .btn-arrow--enter,
  .hero-actions .btn-primary:hover .btn-arrow-track .btn-arrow--enter {
    transform: none;
    transition: none;
  }

  .hero-actions .btn-primary .btn-arrow-track .btn-arrow--enter,
  .hero-actions .btn-primary:hover .btn-arrow-track .btn-arrow--enter {
    display: none;
  }
}