/* ============================================================
   base.css — Malik Anees Ahmed Portfolio
   Cyber-Obsidian Theme · Complete Consolidated Stylesheet
   All BEM classes from JS-generated DOM included.
   ============================================================ */

/* ── 0. Design Tokens ──────────────────────────────────────── */
:root {
  --bg-primary:       #080d17;
  --bg-secondary:     #0d1421;
  --surface:          rgba(12, 19, 32, 0.75);
  --surface-strong:   rgba(14, 22, 38, 0.92);
  --line:             rgba(0, 229, 255, 0.12);
  --line-soft:        rgba(165, 196, 255, 0.09);
  --text-primary:     #eef4ff;
  --text-secondary:   #c2cfe6;   /* AA: ~11:1 on --bg-primary — crisp body text */
  --text-dim:         #9aa9c4;   /* AA: ~6.9:1 on --bg-primary — meta/labels */
  --accent-cyan:      #00e5ff;
  --accent-violet:    #8b7bff;   /* second accent — electric indigo/violet */
  --accent-orange:    #ff8a3d;
  --accent-cyan-dim:  rgba(0, 229, 255, 0.15);
  --accent-cyan-glow: rgba(0, 229, 255, 0.28);

  /* Glow tokens (defined now, applied in Phase 4) */
  --glow-cyan:        rgba(0, 229, 255, 0.45);
  --glow-violet:      rgba(139, 123, 255, 0.45);
  --grad-accent:      linear-gradient(120deg, var(--accent-cyan), var(--accent-violet));
  --shadow-card:      0 24px 64px rgba(0, 0, 0, 0.5), 0 1px 0 rgba(255,255,255,0.04) inset;
  --shadow-elevated:  0 40px 100px rgba(0, 0, 0, 0.6);
  --radius-xl:        28px;
  --radius-lg:        20px;
  --radius-md:        14px;
  --radius-sm:        8px;
  --nav-h:            72px;
  --scroll-pad:       96px;
  --transition:       180ms cubic-bezier(0.25, 0.46, 0.45, 0.94);

  /* Semantic aliases — proof-state colour language.
     signal-cyan = shipped & measured · ember = growing / human / in-progress */
  --signal-cyan:      var(--accent-cyan);
  --ember:            var(--accent-orange);
  --ember-glow:       rgba(255, 138, 61, 0.16);

  /* Type scale */
  --fs-display: clamp(3.4rem, 11vw, 8.4rem);
  --fs-h2:      clamp(1.9rem, 5vw, 3.9rem);
  --fs-h3:      clamp(1.1rem, 2vw, 1.5rem);
  --fs-body:    1rem;
  --fs-body-sm: 0.9rem;
  --fs-label:   0.7rem;
  --fs-micro:   0.66rem;
}

/* ── 1. Fonts (self-hosted latin subsets — no FOUT, no external request) ──── */
@font-face {
  font-family: 'Space Grotesk'; font-style: normal; font-weight: 400; font-display: swap;
  src: url('../fonts/space-grotesk-400.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk'; font-style: normal; font-weight: 500; font-display: swap;
  src: url('../fonts/space-grotesk-500.woff2') format('woff2');
}
@font-face {
  font-family: 'Space Grotesk'; font-style: normal; font-weight: 700; font-display: swap;
  src: url('../fonts/space-grotesk-700.woff2') format('woff2');
}
@font-face {
  font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 400; font-display: swap;
  src: url('../fonts/ibm-plex-mono-400.woff2') format('woff2');
}
@font-face {
  font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 500; font-display: swap;
  src: url('../fonts/ibm-plex-mono-500.woff2') format('woff2');
}
@font-face {
  font-family: 'IBM Plex Mono'; font-style: normal; font-weight: 600; font-display: swap;
  src: url('../fonts/ibm-plex-mono-600.woff2') format('woff2');
}

/* ── 1b. Reset & Base ──────────────────────────────────────── */
/* Metrics-matched fallback — minimises layout shift (CLS) during web-font swap */
@font-face {
  font-family: 'SG Fallback';
  src: local('Arial'), local('Helvetica Neue'), local('sans-serif');
  size-adjust: 105%;
  ascent-override: 88%;
  descent-override: 22%;
  line-gap-override: 0%;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--scroll-pad);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Space Grotesk', 'SG Fallback', sans-serif;
  color: var(--text-primary);
  background:
    radial-gradient(ellipse at 15% 10%, rgba(0, 229, 255, 0.10) 0%, transparent 38%),
    radial-gradient(ellipse at 85% 8%,  rgba(255, 138, 61, 0.06) 0%, transparent 28%),
    radial-gradient(ellipse at 50% 70%, rgba(0, 120, 200, 0.05) 0%, transparent 50%),
    linear-gradient(180deg, var(--bg-primary) 0%, #050810 100%);
  background-attachment: fixed;
  min-height: 100vh;
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: calc(var(--nav-h) + env(safe-area-inset-top, 0px));
  color-scheme: dark;
}

/* Prevent horizontal overflow at every level */
html, body, main { max-width: 100vw; overflow-x: hidden; }

a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; cursor: pointer; }
img { display: block; max-width: 100%; height: auto; }
ul { list-style: none; }

/* ── 2. Skip Link ──────────────────────────────────────────── */
.skip-link {
  position: absolute;
  top: -9999px;
  left: 0;
  z-index: 9999;
  padding: 12px 24px;
  background: var(--accent-cyan);
  color: var(--bg-primary);
  font-weight: 700;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { top: 0; }

/* Keyboard focus — visible, theme-matched, never removed */
:focus-visible {
  outline: 2px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}
/* Pointer users don't get the ring; keyboard users always do */
:focus:not(:focus-visible) { outline: none; }

/* ── 3. Background Decorations ─────────────────────────────── */
.bg-grid,
.cursor-halo {
  position: fixed;
  inset: 0;
  pointer-events: none;
}

.bg-grid {
  z-index: 0;
  opacity: 0.10;
  background-image:
    linear-gradient(rgba(0, 229, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 229, 255, 0.05) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: linear-gradient(180deg, rgba(0,0,0,0.85), transparent 88%);
}

/* Ambient depth glows — soft, slow-drifting colour that fills the dark space
   below the hero. Kept low-opacity so it reads as atmosphere behind content,
   never noise under text. Screen-blended, GPU-cheap (transform-only motion). */
.ambient {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.ambient__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  mix-blend-mode: screen;
  will-change: transform;
}
.ambient__blob--cyan {
  width: 46vmax; height: 46vmax;
  left: -12vmax; top: 30%;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.13), transparent 68%);
  animation: ambient-drift-a 34s ease-in-out infinite;
}
.ambient__blob--violet {
  width: 40vmax; height: 40vmax;
  right: -10vmax; top: 55%;
  background: radial-gradient(circle, rgba(139, 123, 255, 0.12), transparent 68%);
  animation: ambient-drift-b 46s ease-in-out infinite;
}
.ambient__blob--cyan2 {
  width: 34vmax; height: 34vmax;
  left: 34%; bottom: -12vmax;
  background: radial-gradient(circle, rgba(0, 170, 255, 0.09), transparent 70%);
  animation: ambient-drift-c 54s ease-in-out infinite;
}
@keyframes ambient-drift-a {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50%      { transform: translate3d(7vmax, -5vmax, 0) scale(1.08); }
}
@keyframes ambient-drift-b {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50%      { transform: translate3d(-6vmax, 4vmax, 0) scale(1.1); }
}
@keyframes ambient-drift-c {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  50%      { transform: translate3d(5vmax, -4vmax, 0) scale(0.92); }
}

/* Cursor halo perfectly centered (400x400 / 2 = 200px offset) */
.cursor-halo {
  position: fixed;
  top: 0; left: 0;
  inset: unset;
  width: 400px;
  height: 400px;
  border-radius: 50%;
  background: radial-gradient(
    circle,
    rgba(0, 229, 255, 0.13) 0%,
    rgba(0, 229, 255, 0.05) 40%,
    transparent 70%
  );
  mix-blend-mode: screen;
  filter: blur(6px);
  z-index: 1;
  pointer-events: none;
  will-change: transform;
}

/* ── 4. Layer Stacking ─────────────────────────────────────── */
.site-header,
.site-footer,
main { position: relative; z-index: 2; }

/* ── 5. Header & Navigation ────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0; right: 0;
  height: calc(var(--nav-h) + env(safe-area-inset-top, 0px));
  padding: env(safe-area-inset-top, 0px)
           max(clamp(16px, 4vw, 40px), env(safe-area-inset-right, 0px))
           0
           max(clamp(16px, 4vw, 40px), env(safe-area-inset-left, 0px));
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  background: rgba(8, 13, 23, 0.82);
  border-bottom: 1px solid rgba(0, 229, 255, 0.07);
  transition: border-color var(--transition), box-shadow var(--transition);
  z-index: 100;
}
.site-header.is-scrolled {
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.6);
  border-bottom-color: rgba(0, 229, 255, 0.14);
}

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 100%;
  max-width: 1360px;
  margin: 0 auto;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  white-space: nowrap;
  flex-shrink: 0;
}
.brand span { color: var(--accent-cyan); }

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

.nav-link {
  padding: 8px 13px;
  border-radius: 999px;
  color: var(--text-secondary);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.75rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  border: 1px solid transparent;
  transition: color var(--transition), border-color var(--transition),
              background var(--transition), transform var(--transition);
  white-space: nowrap;
}
.nav-link:hover {
  color: var(--text-primary);
  border-color: rgba(0, 229, 255, 0.22);
  background: rgba(0, 229, 255, 0.05);
  transform: translateY(-1px);
}
/* Active item carries the cyan→violet gradient tint so it reads distinctly
   from a plain cyan hover. Text stays --text-primary for full legibility. */
.nav-link.is-active {
  color: var(--text-primary);
  border-color: rgba(139, 123, 255, 0.34);
  background: linear-gradient(120deg, rgba(0, 229, 255, 0.14), rgba(139, 123, 255, 0.13));
}

.menu-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 10px 18px;
  border-radius: 999px;
  border: 1px solid rgba(0, 229, 255, 0.22);
  background: rgba(0, 229, 255, 0.05);
  color: var(--text-primary);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.76rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  transition: background var(--transition), border-color var(--transition);
}
.menu-toggle:hover { background: rgba(0, 229, 255, 0.10); }

/* Touch devices: ensure the horizontal nav links meet the 44px target */
@media (pointer: coarse) {
  .nav-link { min-height: 44px; display: inline-flex; align-items: center; }
}

/* ── 6. Layout Containers ──────────────────────────────────── */
.section {
  max-width: 1360px;
  margin: 0 auto;
  padding: clamp(72px, 9vw, 116px) clamp(16px, 4vw, 40px) 0;
}

/* ── 7. Section Headings ───────────────────────────────────── */
.section-heading {
  max-width: 900px;
  margin-bottom: 48px;
}
.section-heading h2 {
  font-size: clamp(2rem, 5vw, 4.4rem);
  line-height: 0.98;
  letter-spacing: -0.055em;
  text-wrap: balance;
  color: var(--text-primary);   /* solid — no gradient/fade */
}
.section-heading p.eyebrow { margin-bottom: 14px; }

.eyebrow {
  color: var(--accent-cyan);   /* solid fallback — both gradient stops are ≥ AA */
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.26em;
  text-transform: uppercase;
}
/* Richer cyan→violet eyebrows where text-clip is supported. Applied to the
   word-split inner spans too, so each word keeps the gradient after GSAP wraps it. */
@supports ((background-clip: text) or (-webkit-background-clip: text)) {
  .eyebrow,
  .eyebrow .word-inner {
    background: var(--grad-accent);
    -webkit-background-clip: text;
            background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
  }
}

/* ── 8. Card Base ──────────────────────────────────────────── */
.card-base,
.info-card,
.stack-group,
.project-card,
.cert-card,
.contact-card,
.exp-card,
.tl-body,
.process-step,
.ref-card {
  /* Glass surface (padding-box) + a faint cyan→violet gradient border
     (border-box). The border stays subtle at rest; hover intensifies it and
     adds a soft dual glow. Text sits on the frosted padding-box, so the glow
     — an outer shadow — never touches legibility. */
  background:
    linear-gradient(158deg, rgba(14, 22, 38, 0.86) 0%, rgba(10, 16, 28, 0.72) 100%) padding-box,
    linear-gradient(135deg, rgba(0, 229, 255, 0.22), rgba(139, 123, 255, 0.18)) border-box;
  border: 1px solid transparent;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: background var(--transition), box-shadow var(--transition),
              transform var(--transition);
}
.info-card:hover,
.stack-group:hover,
.project-card:hover,
.cert-card:hover,
.contact-card:hover,
.tl-body:hover,
.process-step:hover,
.exp-card:hover {
  background:
    linear-gradient(158deg, rgba(16, 25, 42, 0.9) 0%, rgba(11, 18, 31, 0.78) 100%) padding-box,
    linear-gradient(135deg, rgba(0, 229, 255, 0.55), rgba(139, 123, 255, 0.45)) border-box;
  box-shadow: var(--shadow-elevated),
              0 0 28px -8px var(--glow-cyan),
              0 0 44px -14px var(--glow-violet);
  transform: translateY(-3px);
}

/* Card 3D tilt (JS-driven, desktop pointers only) — JS controls the transform,
   so give it a snappier transition and keep the glow smooth. */
.project-card.tilt,
.cert-card.tilt {
  will-change: transform;
  transition: transform 120ms ease-out,
              border-color var(--transition), box-shadow var(--transition);
}

/* ── 9. Hero Section ───────────────────────────────────────── */
.hero-section {
  position: relative;
  isolation: isolate;              /* own stacking context: texture sits below copy/portrait */
  min-height: calc(100svh - var(--nav-h));
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  align-items: center;
  gap: clamp(28px, 5vw, 64px);
  padding: clamp(28px, 4vw, 56px) clamp(16px, 4vw, 40px);
  max-width: 1360px;
  margin: 0 auto;
}

/* ── Quiet premium hero texture (replaces the old WebGL dot-sphere) ───────── */
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;                      /* below hero-copy / hero-portrait (z-index 2) */
  overflow: hidden;
  pointer-events: none;
}
/* Soft, expensive-looking wash — faint cyan + violet tints, never neon */
.hero-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 68% at 76% 40%, rgba(0, 229, 255, 0.07), transparent 70%),
    radial-gradient(52% 60% at 94% 70%, rgba(139, 123, 255, 0.06), transparent 72%);
}
/* Faint topographic contour lines, masked so they dissolve at the edges */
.hero-topo {
  position: absolute;
  top: 50%;
  right: -4%;
  width: min(760px, 70%);
  aspect-ratio: 1 / 1;
  color: var(--accent-cyan);
  opacity: 0.17;
  transform: translateY(-50%) translate3d(var(--px, 0px), var(--py, 0px), 0);
  transition: transform 320ms cubic-bezier(0.22, 0.61, 0.36, 1);
  will-change: transform;
  -webkit-mask-image: radial-gradient(closest-side, #000 52%, transparent 100%);
          mask-image: radial-gradient(closest-side, #000 52%, transparent 100%);
}

.hero-copy { position: relative; z-index: 2; max-width: 760px; }

.hero-eyebrow { margin-bottom: 18px; }

.hero-title {
  font-size: var(--fs-display);
  line-height: 0.90;
  letter-spacing: -0.08em;
  text-transform: uppercase;
  margin: 0;
}

.hero-description {
  max-width: 56ch;
  margin: 22px 0 0;
  color: var(--text-secondary);
  font-size: clamp(0.98rem, 1.8vw, 1.12rem);
  line-height: 1.72;
}
.hero-description strong { color: var(--text-primary); font-weight: 500; }
.hero-description .on-device {
  font-style: normal;
  color: var(--signal-cyan);
  font-weight: 500;
}
.hero-description .growing {
  font-style: normal;
  color: var(--ember);
  border-bottom: 1px dashed rgba(255, 138, 61, 0.4);
}

.hero-signature {
  margin-top: 18px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: var(--fs-label);
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* Phase 3 — readability scrim: darkens behind the copy so text keeps contrast
   while the node-graph stays visible toward the right/edges. */
.hero-copy::before {
  content: '';
  position: absolute;
  inset: -48px -80px -32px -64px;
  z-index: -1;
  background: radial-gradient(
    120% 130% at 12% 42%,
    rgba(8, 13, 23, 0.86) 0%,
    rgba(8, 13, 23, 0.66) 42%,
    rgba(8, 13, 23, 0.28) 66%,
    transparent 82%
  );
  pointer-events: none;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

/* Hero portrait — threaded into the node-graph */
.hero-portrait {
  position: relative;
  z-index: 2;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
  align-items: center;
}
.portrait-frame {
  position: relative;
  width: min(390px, 90%);
  aspect-ratio: 3 / 4;
  border-radius: var(--radius-xl);
  padding: 6px;
  /* Palette gradient ring + soft dual glow — the portrait is the hero anchor now */
  background: linear-gradient(158deg, rgba(0, 229, 255, 0.5), rgba(139, 123, 255, 0.4));
  box-shadow:
    var(--shadow-elevated),
    0 0 0 1px rgba(0, 229, 255, 0.16),
    0 0 90px -28px var(--glow-cyan),
    0 0 130px -44px var(--glow-violet);
}
.portrait-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: calc(var(--radius-xl) - 6px);
  filter: saturate(1.04) contrast(1.02);
}
.portrait-node {
  position: absolute;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--signal-cyan);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.7);
}
.portrait-node--a { top: 14%;  left: -7px;  }
.portrait-node--b { top: 62%;  right: -7px; }
.portrait-node--c { bottom: 9%; left: 22%; background: var(--ember); box-shadow: 0 0 12px rgba(255, 138, 61, 0.7); }
.hero-portrait figcaption {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  text-align: center;
}
.portrait-loc {
  font-family: 'IBM Plex Mono', monospace;
  font-size: var(--fs-micro);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--signal-cyan);
}
.portrait-open {
  font-size: 0.78rem;
  color: var(--text-dim);
}

/* ── 10. Proof (woven evidence, source-labelled) ───────────── */
.proof {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0;
  margin-top: 36px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.proof__item {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 18px 20px 18px 0;
  border-left: 1px solid var(--line-soft);
  padding-left: 20px;
}
.proof__item:first-child { border-left: 0; padding-left: 0; }
.proof__val {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  color: var(--signal-cyan);
  line-height: 1;
}
.proof__label {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 4px;
}
.proof__src {
  font-family: 'IBM Plex Mono', monospace;
  font-size: var(--fs-micro);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-top: 4px;
}

/* ── 12. Buttons ───────────────────────────────────────────── */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 44px;
  padding: 11px 20px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.10);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.76rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: transform var(--transition), border-color var(--transition),
              background var(--transition), box-shadow var(--transition), color var(--transition);
}
.button:hover { transform: translateY(-2px); }
.button:active { transform: translateY(0); }

.button-primary {
  /* cyan→violet gradient (was cyan-only) for a richer primary action */
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.20), rgba(139, 123, 255, 0.14));
  color: var(--text-primary);
  border-color: rgba(0, 229, 255, 0.34);
}
.button-primary:hover {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.30), rgba(139, 123, 255, 0.22));
  border-color: rgba(139, 123, 255, 0.5);
  box-shadow: 0 0 22px -2px var(--glow-cyan), 0 0 30px -6px var(--glow-violet);
}

.button-resume {
  background: linear-gradient(135deg, rgba(255, 138, 61, 0.22), rgba(0, 229, 255, 0.14));
  border-color: rgba(255, 138, 61, 0.44);
  box-shadow: 0 0 0 1px rgba(255, 138, 61, 0.12), 0 16px 36px rgba(255, 138, 61, 0.16);
}
.button-resume:hover {
  box-shadow: 0 0 0 1px rgba(255, 138, 61, 0.28), 0 20px 48px rgba(255, 138, 61, 0.28);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.03);
  color: var(--text-secondary);
}
.button-secondary:hover {
  background: rgba(255, 255, 255, 0.07);
  color: var(--text-primary);
  border-color: rgba(255, 255, 255, 0.20);
}

.button-apk {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.14), rgba(0, 140, 200, 0.10));
  color: var(--accent-cyan);
  border-color: rgba(0, 229, 255, 0.30);
}
.button-apk:hover {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.24), rgba(0, 140, 200, 0.18));
  box-shadow: 0 0 20px rgba(0, 229, 255, 0.18);
}

/* ── 13. Tags (shared) ─────────────────────────────────────── */
.tag,
.project-tag,
.stack-chip {
  display: inline-flex;
  align-items: center;
  padding: 7px 13px;
  border-radius: 999px;
  border: 1px solid rgba(0, 229, 255, 0.18);
  background: rgba(0, 229, 255, 0.06);
  color: var(--text-secondary);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
  transition: border-color var(--transition), background var(--transition),
              color var(--transition), transform var(--transition);
}
.tag:hover,
.project-tag:hover,
.stack-chip:hover {
  border-color: rgba(0, 229, 255, 0.40);
  background: rgba(0, 229, 255, 0.12);
  color: var(--accent-cyan);
  transform: translateY(-1px);
}

/* ── 14. Stack Grid (JS-generated DOM) ─────────────────────── */
.stack-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}
.filter-chip {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
  color: var(--text-secondary);
  font-family: 'IBM Plex Mono', monospace;
  font-size: var(--fs-label);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color var(--transition), border-color var(--transition),
              background var(--transition);
}
.filter-chip:hover {
  color: var(--text-primary);
  border-color: rgba(0, 229, 255, 0.3);
}
.filter-chip.is-active {
  color: var(--bg-primary);
  background: var(--signal-cyan);
  border-color: var(--signal-cyan);
  font-weight: 600;
}

.stack-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.stack-group[hidden] { display: none; }
/* Reserve space before JS injects content — avoids layout shift (CLS) */
.stack-grid[aria-busy="true"]   { min-height: 320px; }
.project-grid[aria-busy="true"] { min-height: 700px; }

.stack-cat__badge {
  display: inline-block;
  margin-left: 8px;
  padding: 2px 8px;
  border-radius: 999px;
  font-size: 0.58rem;
  letter-spacing: 0.12em;
  color: var(--ember);
  border: 1px solid rgba(255, 138, 61, 0.35);
  background: var(--ember-glow);
  vertical-align: middle;
}

.stack-chip--learning {
  border-color: rgba(255, 138, 61, 0.4);
  background: var(--ember-glow);
  color: var(--ember);
  gap: 7px;
}
.stack-chip--learning:hover {
  border-color: rgba(255, 138, 61, 0.65);
  background: rgba(255, 138, 61, 0.2);
  color: var(--ember);
}
.chip-tag {
  font-size: 0.54rem;
  letter-spacing: 0.1em;
  padding: 1px 6px;
  border-radius: 999px;
  background: rgba(255, 138, 61, 0.22);
  color: var(--ember);
}

.stack-group {
  padding: clamp(18px, 2.5vw, 26px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.stack-cat {
  color: var(--accent-cyan);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  border-bottom: 1px solid rgba(0, 229, 255, 0.12);
  padding-bottom: 12px;
}

.stack-items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-content: flex-start;
}

.stack-items .stack-chip {
  font-size: 0.66rem;
  padding: 6px 11px;
  cursor: default;
}

/* ── 15. Project Grid (JS-generated DOM) ───────────────────── */
.project-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

/* 3 projects: last card spans full width automatically */
.project-grid > .project-card:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.project-card {
  padding: clamp(22px, 3vw, 32px);
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.project-card__header {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.project-card__domain {
  flex-shrink: 0;
  align-self: flex-start;
  font-family: 'IBM Plex Mono', monospace;
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--signal-cyan);
  padding: 5px 11px;
  border-radius: 999px;
  border: 1px solid rgba(0, 229, 255, 0.22);
  background: rgba(0, 229, 255, 0.06);
}

.project-card__titles { flex: 1; }
.project-card__titles h3 {
  font-size: clamp(1.15rem, 2.2vw, 1.6rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 5px;
}

.project-card__subtitle {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.project-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 10px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.project-card__type { color: var(--accent-cyan); opacity: 0.8; }
.project-card__period { }
.project-card__role { }
.project-card__sep { opacity: 0.4; }

.project-card__bullets {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-left: 18px;
  list-style: disc;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
  flex: 1;
}
.project-card__bullets li::marker { color: var(--accent-cyan); opacity: 0.6; }

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
  padding-top: 6px;
}

.project-card__link { }

/* Architecture / data-flow diagram (Phase 5) */
.flow {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
  gap: 8px;
  padding: 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background:
    rgba(0, 229, 255, 0.03) padding-box,
    linear-gradient(135deg, rgba(0, 229, 255, 0.18), rgba(139, 123, 255, 0.15)) border-box;
}
.flow__stage {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
}
.flow__label {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.58rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.flow__nodes { display: flex; flex-direction: column; gap: 6px; height: 100%; }
.flow__nodes--parallel { gap: 6px; }
.flow__node {
  display: flex;
  align-items: center;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(0, 229, 255, 0.22);
  background: linear-gradient(158deg, rgba(14, 22, 38, 0.9), rgba(10, 16, 28, 0.75));
  color: var(--text-primary);
  font-size: 0.74rem;
  line-height: 1.25;
}
.flow__node--out {
  border-color: rgba(255, 138, 61, 0.4);
  background: var(--ember-glow);
  color: var(--ember);
}
.flow__arrow {
  align-self: center;
  flex: 0 0 auto;
  width: 24px;
  height: 12px;
  color: var(--signal-cyan);
  opacity: 0.7;
}
.flow__arrow svg { display: block; width: 100%; height: 100%; overflow: visible; }
/* dasharray > total path length (~26) so the whole arrow draws from one offset */
.flow__arrow svg path { stroke-dasharray: 40; }

/* ── 16. About Grid ────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.info-card {
  padding: clamp(20px, 2.8vw, 30px);
}
.info-card--wide {
  grid-column: 1 / -1;
}

.info-card h3 {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  letter-spacing: -0.02em;
  margin-bottom: 14px;
  color: var(--text-primary);
}
.info-card p {
  color: var(--text-secondary);
  font-size: 0.93rem;
  line-height: 1.72;
}
.info-card p + p { margin-top: 12px; }

.competency-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
  list-style: none;
  padding-left: 0;
}
.competency-list li {
  position: relative;
  padding-left: 20px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.62;
}
.competency-list li::before {
  content: '›';
  position: absolute;
  left: 0;
  color: var(--accent-cyan);
  font-weight: 700;
}

/* Timeline */
.timeline { display: grid; gap: 20px; }

.timeline-item { display: grid; gap: 4px; }

.timeline-item strong {
  display: block;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-primary);
  margin-bottom: 4px;
}
.timeline-org,
.timeline-period,
.timeline-note {
  display: block;
  font-size: 0.87rem;
  color: var(--text-secondary);
}
.timeline-note { color: var(--accent-cyan); opacity: 0.75; font-size: 0.82rem; }

/* ── 17. Experience & Leadership — vertical timeline ───────── */
.timeline-vert { display: grid; gap: 22px; }

.tl-entry {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  gap: 20px;
  align-items: stretch;
}

.tl-rail {
  position: relative;
  display: flex;
  justify-content: center;
}
.tl-rail::before {
  content: '';
  position: absolute;
  top: 10px; bottom: -22px;
  width: 1px;
  background: linear-gradient(var(--line), transparent);
}
.tl-entry:last-child .tl-rail::before { display: none; }
.tl-dot {
  position: relative;
  z-index: 1;
  width: 14px; height: 14px;
  margin-top: 4px;
  border-radius: 50%;
  border: 2px solid var(--bg-primary);
}
.tl-dot--role { background: var(--signal-cyan); box-shadow: 0 0 12px rgba(0, 229, 255, 0.6); }
.tl-dot--lead { background: var(--ember);       box-shadow: 0 0 12px rgba(255, 138, 61, 0.6); }

.tl-body { padding: clamp(20px, 2.8vw, 28px); }

.tl-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.tl-period {
  font-family: 'IBM Plex Mono', monospace;
  font-size: var(--fs-label);
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.tl-kind {
  font-family: 'IBM Plex Mono', monospace;
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 3px 10px;
  border-radius: 999px;
  border: 1px solid;
}
.tl-kind--role { color: var(--signal-cyan); border-color: rgba(0, 229, 255, 0.3); background: rgba(0, 229, 255, 0.06); }
.tl-kind--lead { color: var(--ember);       border-color: rgba(255, 138, 61, 0.35); background: var(--ember-glow); }

.tl-body h3 {
  font-size: var(--fs-h3);
  letter-spacing: -0.02em;
  margin-bottom: 6px;
}
.tl-org {
  font-size: 0.88rem;
  color: var(--accent-cyan);
  opacity: 0.75;
  margin-bottom: 14px;
}
.tl-bullets {
  display: flex;
  flex-direction: column;
  gap: 8px;
  list-style: disc;
  padding-left: 18px;
  color: var(--text-secondary);
  font-size: var(--fs-body-sm);
  line-height: 1.62;
}
.tl-bullets li::marker { color: var(--accent-cyan); opacity: 0.6; }
.exp-card__tag {
  display: inline-block;
  margin-top: 16px;
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid rgba(0, 229, 255, 0.22);
  background: rgba(0, 229, 255, 0.06);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-cyan);
}

/* ── 17b. Process / How I Work ─────────────────────────────── */
.process-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  list-style: none;
  counter-reset: none;
}
.process-step {
  padding: clamp(20px, 2.6vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.process-step__num {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--signal-cyan);
  opacity: 0.85;
}
.process-step h3 {
  font-size: var(--fs-h3);
  letter-spacing: -0.02em;
}
.process-step p {
  color: var(--text-secondary);
  font-size: var(--fs-body-sm);
  line-height: 1.62;
  flex: 1;
}
.process-step__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.process-step__tags .stack-chip { font-size: 0.62rem; padding: 5px 9px; cursor: default; }

.process-note {
  margin-top: 22px;
  padding: 18px 22px;
  border: 1px dashed rgba(255, 138, 61, 0.35);
  border-radius: var(--radius-lg);
  background: var(--ember-glow);
  color: var(--text-secondary);
  font-size: var(--fs-body-sm);
  line-height: 1.6;
}
.process-note strong { color: var(--ember); font-weight: 600; }
.process-note__tag {
  display: inline-block;
  margin-right: 10px;
  padding: 3px 11px;
  border-radius: 999px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: var(--fs-micro);
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--ember);
  border: 1px solid rgba(255, 138, 61, 0.4);
  background: rgba(255, 138, 61, 0.1);
}

/* ── 18. Certifications ─────────────────────────────────────── */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.cert-card {
  padding: clamp(20px, 2.8vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.cert-card__media {
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.08);
  flex-shrink: 0;
}
.cert-card__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  transition: transform 400ms ease;
}
.cert-card__media:hover img { transform: scale(1.03); }

.cert-card__eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  opacity: 0.75;
}

.cert-card h3 {
  font-size: clamp(1.1rem, 2vw, 1.5rem);
  letter-spacing: -0.02em;
}

.cert-card p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.68;
  flex: 1;
}

.cert-card__note {
  font-family: 'IBM Plex Mono', monospace;
  font-size: var(--fs-micro);
  letter-spacing: 0.04em;
  color: var(--text-dim);
  flex: 0 0 auto !important;
}

.cert-card__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: auto;
}

/* ── 19. Contact ────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-bottom: 18px;
}

.contact-card {
  padding: clamp(20px, 2.8vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact-card h3 {
  font-size: clamp(1.05rem, 1.8vw, 1.3rem);
  letter-spacing: -0.02em;
  border-bottom: 1px solid var(--line-soft);
  padding-bottom: 12px;
}

.contact-row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 6px 12px;
}
.contact-row__label {
  flex-shrink: 0;
  min-width: 80px;
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.contact-row__value {
  color: var(--text-secondary);
  font-size: 0.9rem;
  transition: color var(--transition);
}
a.contact-row__value:hover,
.contact-card a:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* References */
.references-block {
  margin-top: 18px;
}
.references-block h3 {
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--text-primary);
}
.references-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}
.ref-card {
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.ref-card strong {
  font-size: 0.95rem;
  color: var(--text-primary);
  margin-bottom: 2px;
}
.ref-card span {
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.5;
}
.ref-card a {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.76rem;
  color: var(--text-dim);
  transition: color var(--transition);
}
.ref-card a:hover {
  color: var(--accent-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── 20. Footer ─────────────────────────────────────────────── */
.site-footer {
  max-width: 1360px;
  margin: 0 auto;
  padding: 80px clamp(16px, 4vw, 40px) 48px;
  text-align: center;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
}
.footer-name {
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-primary);
}
.footer-role {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.footer-links {
  display: flex;
  align-items: center;
  gap: 6px 20px;
  flex-wrap: wrap;
  justify-content: center;
  margin: 8px 0;
}
.footer-links a {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
  transition: color var(--transition);
  padding: 4px 0;
}
.footer-links a:hover { color: var(--accent-cyan); }
.footer-copy {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-dim);
}

/* ── 21. PDF Modal ──────────────────────────────────────────── */
.pdf-modal {
  width: min(92vw, 1060px);
  border: 1px solid rgba(0, 229, 255, 0.18);
  border-radius: var(--radius-xl);
  padding: 0;
  background: rgba(8, 13, 23, 0.97);
  box-shadow: 0 48px 120px rgba(0, 0, 0, 0.72);
}
/* FIX: Added WebKit prefix for iOS Safari glassmorphism */
.pdf-modal::backdrop {
  background: rgba(2, 5, 12, 0.78);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
}
.pdf-modal__shell {
  display: grid;
  gap: 12px;
  padding: 16px;
}
.pdf-modal__close {
  justify-self: end;
  padding: 9px 16px;
  border: 1px solid rgba(255, 255, 255, 0.14);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text-primary);
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.70rem;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  transition: background var(--transition), border-color var(--transition);
}
.pdf-modal__close:hover {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.28);
}
.pdf-modal iframe {
  width: 100%;
  min-height: min(76vh, 800px);
  border: 0;
  border-radius: var(--radius-lg);
  background: #0b101b;
}

/* ── 22. Reveal Animation Baseline ─────────────────────────── */
html:not(.js) .reveal { opacity: 1; transform: none; }

/* ── 23. Noscript ───────────────────────────────────────────── */
.noscript-notice {
  padding: 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-lg);
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
}

/* ── 24. Responsive — Tablet ────────────────────────────────── */
@media (max-width: 1100px) {
  .stack-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .project-grid {
    grid-template-columns: 1fr;
  }
  .project-grid > .project-card:last-child:nth-child(odd) {
    grid-column: auto;
  }
  .process-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* Hero collapses to a single column before the portrait gets cramped, and the
   8-link nav collapses to the hamburger here (it can't fit on one row below ~900px) */
@media (max-width: 900px) {
  .hero-section {
    grid-template-columns: minmax(0, 1fr);
    justify-items: start;
  }
  .hero-portrait { order: -1; align-items: flex-start; }
  .portrait-frame { width: min(300px, 74%); }
  /* Texture even lighter and re-centred now the layout is single-column */
  .hero-topo { opacity: 0.11; width: min(560px, 98%); right: -16%; }

  /* Nav collapses */
  .menu-toggle { display: flex; }
  .nav-panel {
    display: none;
    position: fixed;
    top: calc(var(--nav-h) + env(safe-area-inset-top, 0px));
    left: 0; right: 0;
    background: rgba(8, 13, 23, 0.97);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--line-soft);
    padding: 16px max(16px, env(safe-area-inset-right, 0px))
             calc(16px + env(safe-area-inset-bottom, 0px)) max(16px, env(safe-area-inset-left, 0px));
    flex-direction: column;
    gap: 6px;
    z-index: 99;
    max-height: calc(100svh - var(--nav-h) - env(safe-area-inset-top, 0px));
    overflow-y: auto;
  }
  .nav-panel.is-open { display: flex; }
  .nav-link {
    text-align: center;
    border-radius: var(--radius-md);
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
  }
}

@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .references-grid { grid-template-columns: 1fr; }
  .proof { grid-template-columns: repeat(2, 1fr); }
  .proof__item:nth-child(3) { border-left: 0; padding-left: 0; }
  .process-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ── 25. Responsive — Mobile ────────────────────────────────── */
@media (max-width: 640px) {
  :root { --nav-h: 64px; --scroll-pad: 80px; }
  body { padding-top: calc(var(--nav-h) + env(safe-area-inset-top, 0px)); }
  /* (nav collapse handled at <=900px above) */

  .hero-section { padding-top: 28px; padding-bottom: 48px; }
  .proof { grid-template-columns: repeat(2, 1fr); }

  .stack-grid { grid-template-columns: 1fr; }
  .project-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .references-grid { grid-template-columns: 1fr; }
  .process-grid { grid-template-columns: 1fr; }

  /* Architecture diagram stacks vertically with downward arrows */
  .flow { flex-direction: column; align-items: stretch; }
  .flow__arrow { align-self: center; transform: rotate(90deg); }

  .tl-entry { gap: 14px; grid-template-columns: 22px minmax(0, 1fr); }

  .footer-links { gap: 4px 14px; }

  /* Ambient: lighter blur + drop the third blob to keep phones cool & smooth */
  .ambient__blob { filter: blur(60px); }
  .ambient__blob--cyan2 { display: none; }
}

/* ── 25b. Touch-target sizing — guarantee ≥44px tap areas on touch devices ── */
@media (pointer: coarse) {
  /* .button renders ~43.4px from min-height:44 alone (sub-pixel line-box);
     nudge it clear of 44 on touch without changing the desktop look. */
  .button { min-height: 46px; }
  /* Inline contact / reference / footer links are text-exempt from target
     size, but make them comfortably tappable on phones anyway. */
  a.contact-row__value,
  .ref-card a,
  .footer-links a {
    display: inline-flex;
    align-items: center;
    min-height: 46px;
  }
}

/* ── 26. Safe-area insets for content (landscape notch) ────── */
@supports (padding: max(0px)) {
  .section,
  .hero-section,
  .site-footer {
    padding-left:  max(clamp(16px, 4vw, 40px), env(safe-area-inset-left, 0px));
    padding-right: max(clamp(16px, 4vw, 40px), env(safe-area-inset-right, 0px));
  }
}

/* ── 27. Reduced Motion ─────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}