/* =============================================================================
   PORTFOLIO STYLESHEET — shared by index.html and projects.html
   =============================================================================
   Theming rule: every colour is a token. Components never hardcode a hex or an
   rgba tint, and there are no `[data-theme=...] .component` overrides — the
   light theme is produced entirely by redefining tokens in one block. Adding a
   component means using tokens; it then works in both themes for free.

   Contents
     1  Design tokens          8  Experience
     2  Reset & base           9  Skills
     3  Layout primitives     10  Education
     4  Scroll reveal         11  Projects
     5  Navigation            12  Certifications
     6  Buttons               13  Contact & footer
     7  Hero                  14  Page chrome, projects page, responsive
============================================================================= */

/* ── 1  DESIGN TOKENS ─────────────────────────────────────────────────────
   Dark is the default; the light block below only redefines values.
   ───────────────────────────────────────────────────────────────────────── */
:root {
  --bg-0:  #0d1117;
  --bg-1:  #111827;
  --bg-2:  #1a2332;
  --card:  rgba(26, 35, 50, 0.9);

  --t-high: #f0f6ff;
  --t-mid:  #94a3b8;
  --t-low:  #64748b;

  --accent:        #38bdf8;
  --accent-soft:   rgba(56, 189, 248, 0.08);
  --accent-faint:  rgba(56, 189, 248, 0.03);
  --accent-bdr:    rgba(56, 189, 248, 0.20);
  --accent-glow:   rgba(56, 189, 248, 0.30);

  --ok:            #34d399;
  --ok-soft:       rgba(52, 211, 153, 0.08);
  --ok-bdr:        rgba(52, 211, 153, 0.25);

  --bdr:        rgba(56, 189, 248, 0.12);
  --bdr-hover:  rgba(56, 189, 248, 0.36);

  --shadow:     0 4px 24px rgba(0, 0, 0, 0.5);
  --shadow-lg:  0 12px 48px rgba(0, 0, 0, 0.6);

  --nav-bg:    rgba(13, 17, 23, 0.85);
  --grid-line: rgba(56, 189, 248, 0.04);
  --track:     rgba(255, 255, 255, 0.07);
  --sheen:     rgba(255, 255, 255, 0.12);

  --glow-a: #38bdf8;
  --glow-b: #34d399;
  --orb-opacity: 0.15;

  --font-display: 'Bricolage Grotesque', 'Plus Jakarta Sans', system-ui, sans-serif;
  --font-body:    'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;

  --nav-h: 64px;
  --max-w: 1100px;
  --pad:   0 32px;
  --ease:  cubic-bezier(0.22, 1, 0.36, 1);
}

[data-theme="light"] {
  --bg-0:  #ffffff;
  --bg-1:  #f8fafc;
  --bg-2:  #f1f5f9;
  --card:  rgba(255, 255, 255, 0.95);

  --t-high: #0f172a;
  --t-mid:  #475569;
  --t-low:  #64748b;

  --accent:        #0284c7;
  --accent-soft:   rgba(2, 132, 199, 0.07);
  --accent-faint:  rgba(2, 132, 199, 0.025);
  --accent-bdr:    rgba(2, 132, 199, 0.18);
  --accent-glow:   rgba(2, 132, 199, 0.28);

  --ok:            #059669;
  --ok-soft:       rgba(5, 150, 105, 0.07);
  --ok-bdr:        rgba(5, 150, 105, 0.25);

  --bdr:        rgba(2, 132, 199, 0.14);
  --bdr-hover:  rgba(2, 132, 199, 0.38);

  --shadow:     0 4px 24px rgba(15, 23, 42, 0.10);
  --shadow-lg:  0 12px 48px rgba(15, 23, 42, 0.14);

  --nav-bg:    rgba(255, 255, 255, 0.88);
  --grid-line: rgba(2, 132, 199, 0.05);
  --track:     rgba(0, 0, 0, 0.08);
  --sheen:     rgba(255, 255, 255, 0.35);

  --orb-opacity: 0.10;
}

/* ── 2  RESET & BASE ──────────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  background: var(--bg-1);
  color: var(--t-high);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background 0.3s, color 0.3s;
}

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--bg-0); }
::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }

a   { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
ul  { list-style: none; }
button { font-family: inherit; cursor: pointer; }

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

.skip-link {
  position: absolute; left: -9999px; top: 8px; z-index: 10001;
  padding: 10px 18px; border-radius: 8px;
  background: var(--accent); color: var(--bg-0); font-weight: 700;
}
.skip-link:focus { left: 12px; }

/* Shown only when scripting is off — the page renders its content from data.js,
   so without JS there would otherwise be nothing but the nav and hero name. */
.noscript-note {
  position: relative; z-index: 1001;
  margin: calc(var(--nav-h) + 16px) auto 0; max-width: var(--max-w);
  padding: 18px 22px; border-radius: 12px;
  background: var(--card); border: 1px solid var(--bdr);
  color: var(--t-mid); font-size: 0.9375rem; line-height: 1.7;
}
.noscript-note strong { display: block; color: var(--t-high); margin-bottom: 4px; }
.noscript-note a { color: var(--accent); font-weight: 600; }

/* ── 3  LAYOUT PRIMITIVES ─────────────────────────────────────────────── */
.wrap    { max-width: var(--max-w); margin: 0 auto; padding: var(--pad); }
.section { padding: 96px 0; }

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 0.75rem; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 12px;
}
.eyebrow::before {
  content: ''; width: 20px; height: 2px; flex-shrink: 0;
  background: var(--accent); border-radius: 1px;
}

.sec-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800; letter-spacing: -0.025em; line-height: 1.15;
  color: var(--t-high); margin-bottom: 12px;
  text-wrap: balance;
}

.sec-sub {
  font-size: 1.0625rem; color: var(--t-mid);
  max-width: 520px; margin-bottom: 52px; line-height: 1.75;
}

.grad {
  background: linear-gradient(135deg, var(--accent), var(--ok));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}

.divider { height: 1px; background: var(--bdr); }

/* ── 4  SCROLL REVEAL ─────────────────────────────────────────────────── */
.r {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}
.r.on { opacity: 1; transform: none; }

/* ── 5  NAVIGATION ────────────────────────────────────────────────────── */
#progress-bar {
  position: fixed; top: 0; left: 0; height: 2px; width: 0;
  z-index: 10000; pointer-events: none;
  background: linear-gradient(90deg, var(--accent), var(--ok), var(--accent));
  background-size: 200% auto;
  animation: prog-shimmer 2s linear infinite;
}
@keyframes prog-shimmer { to { background-position: 200% center; } }

#nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-h);
  background: var(--nav-bg);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--bdr);
  transition: box-shadow 0.3s, background 0.3s, border-color 0.3s;
}
#nav.scrolled { box-shadow: var(--shadow); }

.nav-inner {
  max-width: var(--max-w); margin: 0 auto; padding: var(--pad);
  height: 100%; gap: 24px;
  display: flex; align-items: center; justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.125rem; font-weight: 800;
  letter-spacing: -0.02em; white-space: nowrap; flex-shrink: 0;
  color: var(--t-high);
}
.nav-logo .dot { color: var(--accent); }

.nav-links { display: flex; align-items: center; gap: 4px; }
.nav-links a {
  padding: 6px 14px; border-radius: 8px;
  font-size: 0.875rem; font-weight: 500; color: var(--t-mid);
  transition: color 0.2s, background 0.2s;
}
.nav-links a:hover,
.nav-links a.active { color: var(--accent); background: var(--accent-soft); }

.nav-right { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }

.theme-btn {
  width: 36px; height: 36px; border-radius: 8px;
  border: 1px solid var(--bdr); background: transparent;
  color: var(--t-mid); font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  transition: border-color 0.2s, color 0.2s, background 0.2s;
}
.theme-btn:hover { border-color: var(--bdr-hover); color: var(--accent); background: var(--accent-soft); }

.nav-cta-btn {
  display: inline-block; padding: 7px 18px; border-radius: 8px;
  font-size: 0.875rem; font-weight: 600; white-space: nowrap;
  color: var(--accent); border: 1.5px solid var(--accent);
  background: transparent; transition: background 0.2s;
}
.nav-cta-btn:hover { background: var(--accent-soft); }

.nav-back {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 18px; border-radius: 8px;
  font-size: 0.875rem; font-weight: 600; color: var(--accent);
  border: 1.5px solid var(--bdr-hover);
  transition: background 0.2s, transform 0.2s;
}
.nav-back:hover { background: var(--accent-soft); transform: translateX(-2px); }

.burger {
  display: none; flex-direction: column; gap: 5px;
  padding: 6px; background: none; border: none;
}
.burger span {
  display: block; width: 22px; height: 2px;
  background: var(--t-mid); border-radius: 2px; transition: 0.3s;
}

.mob-menu {
  display: none; position: fixed; top: var(--nav-h); left: 0; right: 0;
  z-index: 999; flex-direction: column; gap: 2px;
  padding: 12px 20px 16px;
  background: var(--nav-bg);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--bdr);
}
.mob-menu.open { display: flex; }
.mob-menu a {
  padding: 11px 14px; border-radius: 8px;
  font-size: 0.9375rem; font-weight: 500; color: var(--t-mid);
  transition: 0.2s;
}
.mob-menu a:hover { background: var(--accent-soft); color: var(--accent); }

/* ── 6  BUTTONS ───────────────────────────────────────────────────────── */
.btn-primary, .btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  border-radius: 10px; font-size: 0.9375rem;
  position: relative; overflow: hidden;
  transition: transform 0.2s, box-shadow 0.2s, background 0.2s, opacity 0.2s;
}
.btn-primary {
  padding: 13px 28px; font-weight: 700;
  color: var(--bg-0); background: var(--accent); border: none;
  box-shadow: 0 4px 20px var(--accent-glow);
}
.btn-primary:hover { opacity: 0.92; transform: translateY(-2px); box-shadow: 0 8px 28px var(--accent-glow); }

.btn-ghost {
  padding: 12px 27px; font-weight: 600;
  color: var(--accent); background: transparent;
  border: 1.5px solid var(--bdr-hover);
}
.btn-ghost:hover { background: var(--accent-soft); transform: translateY(-2px); }

.btn-primary::after, .btn-ghost::after {
  content: ''; position: absolute; inset: 0;
  background: var(--sheen); transform: translateX(-100%);
  transition: transform 0.4s var(--ease);
}
.btn-primary:hover::after, .btn-ghost:hover::after { transform: translateX(100%); }

/* ── 7  HERO ──────────────────────────────────────────────────────────── */
#hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center; overflow: hidden;
  background: var(--bg-0);
}
#hero::before {
  content: ''; position: absolute; inset: 0; pointer-events: none;
  background-image: radial-gradient(circle, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
}
#hero::after {
  content: ''; position: absolute; inset: 0; pointer-events: none; z-index: 0;
  background: radial-gradient(ellipse 70% 60% at 50% 50%, var(--accent-faint) 0%, transparent 70%);
  animation: hero-pulse 6s ease-in-out infinite;
}
@keyframes hero-pulse {
  0%, 100% { opacity: 0.6; transform: scale(1); }
  50%      { opacity: 1;   transform: scale(1.04); }
}

/* canvas is a replaced element: `inset:0` alone resolves width/height to its
   intrinsic 300x150, so the size has to be stated explicitly. */
#hero-canvas { position: absolute; inset: 0; z-index: 0; width: 100%; height: 100%; }

.orb {
  position: absolute; border-radius: 50%;
  filter: blur(100px); opacity: var(--orb-opacity);
  pointer-events: none; will-change: transform;
}
.orb-a {
  width: 640px; height: 640px; top: -10%; right: 0;
  background: radial-gradient(circle, var(--glow-a), transparent 65%);
}
.orb-b {
  width: 480px; height: 480px; bottom: -10%; left: -5%;
  background: radial-gradient(circle, var(--glow-b), transparent 65%);
}

.hero-floaters, .hero-scan {
  position: absolute; inset: 0; overflow: hidden;
  pointer-events: none; z-index: 0;
}
.floater {
  position: absolute; white-space: nowrap;
  padding: 5px 13px; border-radius: 100px;
  font-size: 0.6875rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--accent); opacity: 0.16;
  border: 1px solid var(--accent-bdr);
  background: var(--accent-faint);
  backdrop-filter: blur(4px);
  animation: float-badge var(--dur, 9s) ease-in-out var(--dl, 0s) infinite;
}
@keyframes float-badge {
  0%, 100% { transform: translateY(0)     rotate(var(--rot, -1deg)); }
  50%      { transform: translateY(-14px) rotate(calc(var(--rot, 0deg) * -1 + 1deg)); }
}

.hero-scan::after {
  content: ''; position: absolute; left: -10%; right: -10%; top: -1px; height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent) 30%, var(--ok) 70%, transparent);
  opacity: 0.18;
  animation: scan-sweep 10s linear 1.5s infinite;
}
@keyframes scan-sweep {
  0%   { top: -1px; opacity: 0; }
  4%   { opacity: 0.18; }
  96%  { opacity: 0.12; }
  100% { top: 100%; opacity: 0; }
}

.hero-body {
  position: relative; z-index: 1; width: 100%;
  padding-top: calc(var(--nav-h) + 40px); padding-bottom: 60px;
  display: grid; grid-template-columns: 1fr 300px; gap: 56px; align-items: center;
}

.avail-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 14px; margin-bottom: 16px; border-radius: 100px;
  font-size: 0.8125rem; font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid var(--accent-bdr);
}
.avail-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 8px var(--accent);
  animation: pulse-dot 2s infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%      { opacity: 0.4; transform: scale(0.7); }
}

.hero-name {
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 6.5vw, 5.25rem);
  font-weight: 800; letter-spacing: -0.04em; line-height: 1;
  color: var(--t-high); margin-bottom: 8px;
}
.hero-name .c {
  display: inline-block; opacity: 0;
  transform: translateY(28px) skewX(-4deg);
  animation: char-rise 0.52s var(--ease) forwards;
  animation-delay: var(--d, 0ms);
}
@keyframes char-rise { to { opacity: 1; transform: none; } }

/* The gradient line must stay a single element. `background-clip:text` cannot
   paint behind inline-block descendants, so wrapping its letters in .c spans
   renders it invisible — it rises as one unit instead. */
.hero-name .grad {
  display: inline-block;
  background: linear-gradient(90deg, var(--accent) 0%, var(--ok) 35%, var(--accent) 70%);
  background-size: 200% auto;
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: shimmer 3.5s linear infinite;
}
@keyframes shimmer { to { background-position: -100% center; } }

.hero-name .grad-rise {
  opacity: 0;
  transform: translateY(28px) skewX(-4deg);
  animation: char-rise 0.6s var(--ease) forwards var(--d, 0ms),
             shimmer 3.5s linear infinite;
}

.hero-role {
  font-size: clamp(1rem, 1.8vw, 1.25rem); font-weight: 500;
  color: var(--t-mid); margin-bottom: 14px; min-height: 1.75em;
}
.typed-cursor {
  display: inline-block; width: 2px; height: 1em;
  background: var(--accent); vertical-align: middle; margin-left: 2px;
  animation: blink 1s step-end infinite;
}
@keyframes blink { 0%, 100% { opacity: 1; } 50% { opacity: 0; } }

.hero-desc {
  font-size: 1.0625rem; color: var(--t-mid); line-height: 1.8;
  max-width: 520px; margin-bottom: 28px;
}

.cta-row { display: flex; gap: 12px; flex-wrap: wrap; }

.hero-stats {
  display: flex; flex-wrap: wrap; gap: 32px;
  margin-top: 48px; padding-top: 32px;
  border-top: 1px solid var(--bdr);
}
.h-stat { display: flex; flex-direction: column; gap: 2px; }
.h-stat-n {
  font-family: var(--font-display);
  font-size: 1.875rem; font-weight: 800;
  letter-spacing: -0.03em; line-height: 1;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(135deg, var(--accent), var(--ok));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.h-stat-l {
  font-size: 0.75rem; font-weight: 600; color: var(--t-low);
  text-transform: uppercase; letter-spacing: 0.08em;
}

.hero-card {
  padding: 22px; border-radius: 16px;
  background: var(--card); border: 1px solid var(--bdr);
  backdrop-filter: blur(16px); box-shadow: var(--shadow-lg);
  animation: card-bob 7s ease-in-out infinite;
}
@keyframes card-bob { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

.hc-head {
  display: flex; align-items: center; gap: 10px;
  padding-bottom: 14px; margin-bottom: 16px;
  border-bottom: 1px solid var(--bdr);
}
.hc-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--ok); box-shadow: 0 0 8px var(--ok);
  animation: pulse-dot 1.8s infinite;
}
.hc-title { font-size: 0.8125rem; font-weight: 700; color: var(--t-high); }
.hc-sub   { font-size: 0.75rem; color: var(--t-mid); margin-left: auto; }

.hc-info-row {
  display: flex; justify-content: space-between; align-items: center;
  gap: 12px; padding: 9px 0; border-bottom: 1px solid var(--bdr);
}
.hc-info-row:last-child { border-bottom: none; padding-bottom: 2px; }
.hc-info-label { font-size: 0.8125rem; color: var(--t-mid); flex-shrink: 0; }
.hc-info-val   { font-size: 0.8125rem; font-weight: 600; color: var(--t-high); text-align: right; }

/* ── 8  ABOUT ─────────────────────────────────────────────────────────── */
#about { background: var(--bg-1); }

.about-layout { display: grid; grid-template-columns: 210px 1fr; gap: 56px; align-items: start; }

.about-photo-col {
  display: flex; flex-direction: column; align-items: center; gap: 18px;
  position: sticky; top: calc(var(--nav-h) + 24px);
}
.profile-ring-wrap { position: relative; width: 176px; height: 176px; flex-shrink: 0; }
.profile-ring-wrap::before {
  content: ''; position: absolute; inset: -3px; z-index: 0; border-radius: 50%;
  background: conic-gradient(from 0deg, var(--accent) 0%, var(--ok) 40%, transparent 60%, var(--accent) 100%);
  animation: ring-spin 8s linear infinite;
}
.profile-ring-wrap::after {
  content: ''; position: absolute; inset: 1px; z-index: 0;
  border-radius: 50%; background: var(--bg-1);
}
@keyframes ring-spin { to { transform: rotate(360deg); } }
.profile-photo {
  position: relative; z-index: 1;
  width: 100%; height: 100%; border-radius: 50%;
  object-fit: cover; object-position: top center;
}

.lang-col { display: flex; flex-direction: column; align-items: center; gap: 8px; }
.lang-pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 100px;
  font-size: 0.875rem; color: var(--t-mid);
  background: var(--card); border: 1px solid var(--bdr);
}
.lang-pill strong { color: var(--t-high); font-weight: 600; }

.about-content { display: flex; flex-direction: column; gap: 28px; }
.about-text { display: flex; flex-direction: column; gap: 18px; }
.about-text p { font-size: 1.0625rem; color: var(--t-mid); line-height: 1.82; }
.about-text strong { color: var(--t-high); font-weight: 600; }

.about-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; }
.ac {
  padding: 20px; border-radius: 14px;
  background: var(--card); border: 1px solid var(--bdr);
  transform-style: preserve-3d;
  transition: transform 0.45s var(--ease), border-color 0.25s, box-shadow 0.25s;
}
.ac:hover { border-color: var(--bdr-hover); box-shadow: var(--shadow); }
.ac-ico {
  width: 36px; height: 36px; margin-bottom: 10px; color: var(--accent);
  display: flex; align-items: center; justify-content: center;
}
.ac-ico svg { width: 22px; height: 22px; display: block; }
.ac-title { font-size: 0.9375rem; font-weight: 700; color: var(--t-high); margin-bottom: 5px; }
.ac-desc  { font-size: 0.875rem; color: var(--t-low); line-height: 1.6; }

/* ── 9  EXPERIENCE ────────────────────────────────────────────────────── */
#experience { background: var(--bg-2); }

.exp-company-group { border-bottom: 1px solid var(--bdr); }
.exp-company-group:last-child { border-bottom: none; }

.exp-company-hdr { display: flex; align-items: center; gap: 16px; padding: 40px 0 12px; }
.exp-company-group:first-child .exp-company-hdr { padding-top: 0; }
.exp-co-logo-wrap { flex-shrink: 0; display: flex; align-items: center; }
.exp-logo {
  height: 28px; width: auto; object-fit: contain;
  opacity: 0.85; border-radius: 4px; transition: opacity 0.2s;
}
.exp-logo:hover { opacity: 1; }
.exp-logo-dark  { display: block; }
.exp-logo-light { display: none; }
[data-theme="light"] .exp-logo-dark  { display: none; }
[data-theme="light"] .exp-logo-light { display: block; }
/* Crest logos ship on white; give them a plate so they read on the dark ground. */
:root:not([data-theme="light"]) .exp-logo[src*="hcmut"] {
  background: rgba(255, 255, 255, 0.08); padding: 2px; border-radius: 50%;
}
.exp-co-badge {
  display: inline-flex; align-items: center; justify-content: center;
  height: 28px; padding: 0 10px; border-radius: 8px;
  font-size: 0.625rem; font-weight: 800; letter-spacing: 0.04em; white-space: nowrap;
  color: var(--accent); background: var(--accent-soft); border: 1px solid var(--bdr);
}
.exp-co-name { font-family: var(--font-display); font-size: 1rem; font-weight: 700; color: var(--t-high); }
.exp-co-meta { font-size: 0.8125rem; color: var(--t-low); }

.exp-role-entry {
  display: grid; grid-template-columns: 150px 1fr; gap: 32px;
  padding: 28px 0; border-top: 1px solid var(--bdr);
  transition: background 0.2s;
}
.exp-role-entry:hover { background: var(--accent-faint); }

.exp-role-period { font-size: 0.8125rem; font-weight: 600; color: var(--t-low); line-height: 1.5; margin-bottom: 4px; }
.exp-role-type {
  font-size: 0.75rem; font-weight: 500; color: var(--t-low);
  text-transform: uppercase; letter-spacing: 0.07em;
}
.exp-role-now {
  display: inline-block; margin-top: 8px;
  padding: 2px 9px; border-radius: 100px;
  font-size: 0.6875rem; font-weight: 700;
  letter-spacing: 0.06em; text-transform: uppercase;
  color: var(--ok); background: var(--ok-soft); border: 1px solid var(--ok-bdr);
}

.exp-role-title {
  font-family: var(--font-display);
  font-size: 1.0625rem; font-weight: 700; color: var(--t-high);
  line-height: 1.35; margin-bottom: 8px;
}
.exp-supervisor {
  display: flex; align-items: flex-start; gap: 6px;
  font-size: 0.875rem; color: var(--t-low); font-style: italic;
  line-height: 1.6; margin-bottom: 14px;
}
.exp-supervisor::before {
  content: '—'; color: var(--ok); font-style: normal; font-weight: 700; flex-shrink: 0;
}

.exp-buls { display: flex; flex-direction: column; gap: 8px; }
.exp-buls li {
  position: relative; padding-left: 16px;
  font-size: 0.9375rem; color: var(--t-mid); line-height: 1.7;
}
.exp-buls li::before {
  content: '▸'; position: absolute; left: 0; top: 5px;
  color: var(--accent); font-size: 0.7rem;
}
.exp-buls strong { color: var(--t-high); font-weight: 600; }

.award-tag {
  display: inline-flex; align-items: center; gap: 6px;
  margin-top: 14px; padding: 5px 12px; border-radius: 100px;
  font-size: 0.8125rem; font-weight: 600;
  color: var(--ok); background: var(--ok-soft); border: 1px solid var(--ok-bdr);
}

/* ── 10  SKILLS ───────────────────────────────────────────────────────── */
#skills { background: var(--bg-1); }

.skills-layout { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }

.sg {
  padding: 24px; border-radius: 16px;
  background: var(--card); border: 1px solid var(--bdr);
  transition: border-color 0.25s, box-shadow 0.25s;
}
.sg:hover { border-color: var(--bdr-hover); box-shadow: var(--shadow); }

.sg-head {
  display: flex; align-items: center; gap: 10px;
  margin-bottom: 20px; padding-bottom: 14px;
  border-bottom: 1px solid var(--bdr);
}
.sg-icon {
  width: 24px; height: 24px; flex-shrink: 0; color: var(--accent);
  display: flex; align-items: center; justify-content: center;
}
.sg-icon svg { width: 18px; height: 18px; display: block; }
.sg-name { font-size: 0.875rem; font-weight: 700; color: var(--t-high); }

.sk-item + .sk-item { margin-top: 14px; }
.sk-row {
  display: flex; justify-content: space-between; align-items: baseline;
  gap: 10px; margin-bottom: 6px;
}
/* Wraps rather than truncating — a long skill name added later stays readable. */
.sk-name {
  flex: 1 1 auto; min-width: 0;
  font-size: 0.9375rem; font-weight: 500; color: var(--t-high);
  line-height: 1.35;
}
.sk-meta { flex: 0 0 auto; font-size: 0.8125rem; color: var(--t-low); white-space: nowrap; }
.sk-bar  { height: 4px; border-radius: 4px; background: var(--track); overflow: hidden; }
.sk-fill {
  height: 100%; width: 0; border-radius: 4px;
  background: linear-gradient(90deg, var(--accent), var(--ok));
  transition: width 1.4s var(--ease);
}

/* ── 11  EDUCATION ────────────────────────────────────────────────────── */
#education { background: var(--bg-2); }

.edu-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 20px; }

.edu-card {
  position: relative; overflow: hidden;
  padding: 28px; border-radius: 16px;
  background: var(--card); border: 1px solid var(--bdr);
  transform-style: preserve-3d;
  transition: transform 0.45s var(--ease), border-color 0.25s, box-shadow 0.25s;
}
.edu-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--ok));
}
.edu-card:hover { border-color: var(--bdr-hover); box-shadow: var(--shadow); }

.edu-head {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 12px; margin-bottom: 6px;
}
.edu-inst {
  font-family: var(--font-display);
  font-size: 1.0625rem; font-weight: 700; color: var(--t-high); line-height: 1.35;
}
.edu-period { flex-shrink: 0; font-size: 0.8125rem; font-weight: 600; color: var(--t-low); white-space: nowrap; }
.edu-degree { font-size: 0.9375rem; font-weight: 600; color: var(--accent); margin-bottom: 14px; }

.edu-status {
  display: inline-flex; align-items: center; gap: 6px;
  margin-bottom: 16px; padding: 5px 12px; border-radius: 100px;
  font-size: 0.8125rem; font-weight: 700;
  color: var(--ok); background: var(--ok-soft); border: 1px solid var(--ok-bdr);
}

.edu-detail {
  display: flex; align-items: flex-start; gap: 8px;
  font-size: 0.9375rem; color: var(--t-mid); line-height: 1.5; margin-bottom: 8px;
}
.edu-detail::before {
  content: '✓'; flex-shrink: 0; margin-top: 2px;
  color: var(--ok); font-weight: 700; font-size: 0.8rem;
}
.edu-detail-loc { color: var(--t-low); }
.edu-detail-loc::before { content: '📍'; color: inherit; }

.edu-gpa { margin-top: 20px; padding-top: 18px; border-top: 1px solid var(--bdr); }
.edu-gpa-num {
  font-family: var(--font-display);
  font-size: 2.5rem; font-weight: 800;
  letter-spacing: -0.04em; line-height: 1; margin-bottom: 2px;
  font-variant-numeric: tabular-nums;
  background: linear-gradient(135deg, var(--accent), var(--ok));
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent;
}
.edu-gpa-scale { font-size: 1.25rem; opacity: 0.45; }
.edu-gpa-label {
  font-size: 0.8125rem; font-weight: 600; color: var(--t-low);
  text-transform: uppercase; letter-spacing: 0.08em;
}

/* ── 12  PROJECTS ─────────────────────────────────────────────────────── */
#projects { background: var(--bg-1); }

.pro-grid  { display: grid; grid-template-columns: repeat(auto-fill, minmax(460px, 1fr)); gap: 20px; }
.acad-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 20px; }

.pro-card, .acad-card {
  display: flex; flex-direction: column;
  background: var(--card); border: 1px solid var(--bdr);
  transform-style: preserve-3d; will-change: transform;
  transition: transform 0.45s var(--ease), border-color 0.25s, box-shadow 0.25s;
}
.pro-card  { gap: 14px; padding: 28px 30px; border-radius: 18px; }
.acad-card { padding: 26px; border-radius: 16px; }
.pro-card:hover, .acad-card:hover { border-color: var(--bdr-hover); box-shadow: var(--shadow-lg); }

.pro-card-top { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.pro-badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 4px 10px; border-radius: 100px; white-space: nowrap;
  font-size: 0.75rem; font-weight: 700;
  color: var(--accent); background: var(--accent-soft); border: 1px solid var(--accent-bdr);
}
.pro-period { font-size: 0.8125rem; font-weight: 600; color: var(--t-low); white-space: nowrap; }
.pro-title {
  font-family: var(--font-display);
  font-size: 1.125rem; font-weight: 700; color: var(--t-high); line-height: 1.3;
}
.pro-meta {
  display: flex; align-items: center; flex-wrap: wrap; gap: 8px;
  margin-top: -4px; font-size: 0.875rem; color: var(--t-low);
}
.pro-meta span { display: flex; align-items: center; gap: 4px; }
.pro-supervisor {
  display: flex; align-items: flex-start; gap: 6px;
  font-size: 0.875rem; color: var(--t-low); font-style: italic; line-height: 1.55;
}
.pro-supervisor::before { content: '—'; color: var(--ok); font-style: normal; font-weight: 700; flex-shrink: 0; }

.pro-buls { display: flex; flex-direction: column; gap: 7px; flex: 1; }
.pro-buls li {
  position: relative; padding-left: 16px;
  font-size: 0.9375rem; color: var(--t-mid); line-height: 1.7;
}
.pro-buls li::before { content: '▸'; position: absolute; left: 0; top: 5px; color: var(--accent); font-size: 0.7rem; }
.pro-buls strong { color: var(--t-high); font-weight: 600; }

.acad-num {
  font-family: var(--font-display);
  font-size: 0.8125rem; font-weight: 700; color: var(--ok); margin-bottom: 10px;
}
.acad-title {
  font-family: var(--font-display);
  font-size: 1.0625rem; font-weight: 700; color: var(--t-high);
  line-height: 1.35; margin-bottom: 6px;
}
.acad-date { font-size: 0.8125rem; font-weight: 500; color: var(--t-low); margin-bottom: 14px; }
.acad-desc { font-size: 0.9375rem; color: var(--t-mid); line-height: 1.75; flex: 1; margin-bottom: 18px; }

.pro-foot {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px; margin-top: auto;
}
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  padding: 4px 10px; border-radius: 6px;
  font-size: 0.8125rem; font-weight: 500;
  color: var(--accent); background: var(--accent-soft); border: 1px solid var(--accent-bdr);
}
.repo-link {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 5px 12px; border-radius: 8px; white-space: nowrap;
  font-size: 0.8125rem; font-weight: 600; color: var(--t-mid);
  border: 1px solid var(--bdr);
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}
.repo-link:hover { color: var(--accent); border-color: var(--bdr-hover); background: var(--accent-soft); }
.repo-link svg { flex-shrink: 0; }

.proj-view-all { display: flex; justify-content: center; margin-top: 40px; }
.proj-view-all a {
  position: relative; overflow: hidden;
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 36px; border-radius: 12px;
  font-size: 0.9375rem; font-weight: 700; color: var(--accent);
  border: 1.5px solid var(--bdr-hover);
  transition: background 0.22s, transform 0.22s, box-shadow 0.22s;
}
.proj-view-all a:hover {
  background: var(--accent-soft); transform: translateY(-3px);
  box-shadow: 0 8px 28px var(--accent-glow);
}

/* ── 13  CERTIFICATIONS ───────────────────────────────────────────────── */
#certifications { background: var(--bg-2); }

.certs-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; }

.cert-card {
  display: flex; align-items: flex-start; gap: 14px;
  padding: 16px 18px; border-radius: 12px;
  background: var(--card); border: 1px solid var(--bdr);
  transition: border-color 0.22s, transform 0.22s;
}
.cert-card:hover { border-color: var(--bdr-hover); transform: translateX(4px); }

.cert-ico {
  width: 40px; height: 40px; flex-shrink: 0; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-display);
  font-size: 0.8125rem; font-weight: 800; letter-spacing: -0.01em;
  border: 1px solid var(--bdr);
}
.cert-ico-a   { background: rgba(217, 119,  87, 0.10); color: #d97757; border-color: rgba(217, 119,  87, 0.24); }
.cert-ico-g   { background: rgba( 66, 133, 244, 0.10); color: #4285f4; border-color: rgba( 66, 133, 244, 0.24); }
.cert-ico-gc  { background: rgba( 52, 211, 153, 0.10); color: #34d399; border-color: rgba( 52, 211, 153, 0.24); }
.cert-ico-d   { background: rgba(255, 121,  63, 0.10); color: #ff793f; border-color: rgba(255, 121,  63, 0.24); }
.cert-ico-hf  { background: rgba(240, 180,  41, 0.10); color: #f0b429; border-color: rgba(240, 180,  41, 0.24); }
.cert-ico-dc  { background: rgba(  3, 178, 155, 0.10); color: #03b29b; border-color: rgba(  3, 178, 155, 0.24); }
.cert-ico-aws { background: rgba(255, 153,   0, 0.10); color: #ff9900; border-color: rgba(255, 153,   0, 0.24); font-size: 0.625rem; }
.cert-ico-ms  { background: rgba(  0, 120, 212, 0.10); color: #0078d4; border-color: rgba(  0, 120, 212, 0.24); }

.cert-issuer {
  font-size: 0.75rem; font-weight: 700; color: var(--accent);
  text-transform: uppercase; letter-spacing: 0.07em; margin-bottom: 3px;
}
.cert-name { font-size: 0.9375rem; font-weight: 500; color: var(--t-high); line-height: 1.4; margin-bottom: 3px; }
.cert-date { font-size: 0.8125rem; font-weight: 500; color: var(--t-low); }

#certs-extra { display: none; }
#certs-extra.open { display: contents; }

.certs-more-btn { display: flex; justify-content: center; margin-top: 24px; }
.certs-more-btn button {
  padding: 10px 28px; border-radius: 10px;
  font-size: 0.875rem; font-weight: 600; color: var(--accent);
  background: transparent; border: 1.5px solid var(--bdr-hover);
  transition: background 0.2s, transform 0.2s;
}
.certs-more-btn button:hover { background: var(--accent-soft); transform: translateY(-2px); }

/* ── 14  CONTACT & FOOTER ─────────────────────────────────────────────── */
#contact { background: var(--bg-1); }

.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center; }
.contact-chips  { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 20px; }
.chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px; border-radius: 100px;
  font-size: 0.875rem; font-weight: 500; color: var(--t-mid);
  background: var(--card); border: 1px solid var(--bdr);
}
.chip-live { color: var(--ok); background: var(--ok-soft); border-color: var(--ok-bdr); }

.contact-cards { display: flex; flex-direction: column; gap: 12px; }
.contact-card {
  display: flex; align-items: center; gap: 16px;
  padding: 18px 20px; border-radius: 14px; color: var(--t-high);
  background: var(--card); border: 1px solid var(--bdr);
  transition: border-color 0.25s, transform 0.22s;
}
.contact-card:hover { border-color: var(--bdr-hover); transform: translateX(5px); }
.contact-card-ico {
  width: 44px; height: 44px; flex-shrink: 0; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.125rem; color: var(--accent);
  background: var(--accent-soft); border: 1px solid var(--bdr);
}
.contact-card-label {
  font-size: 0.75rem; font-weight: 700; color: var(--t-low);
  text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 2px;
}
.contact-card-value { font-size: 0.9375rem; font-weight: 600; color: var(--t-high); word-break: break-word; }

footer {
  display: flex; align-items: center; justify-content: space-between;
  flex-wrap: wrap; gap: 12px;
  padding: 28px 32px; background: var(--bg-0); border-top: 1px solid var(--bdr);
}
.footer-text { font-size: 0.875rem; color: var(--t-low); }
.footer-text a { color: var(--accent); font-weight: 500; }
.footer-links { display: flex; flex-wrap: wrap; gap: 16px; }
.footer-links a { font-size: 0.875rem; font-weight: 500; color: var(--t-mid); transition: color 0.2s; }
.footer-links a:hover { color: var(--accent); }

#scroll-top {
  position: fixed; bottom: 28px; right: 28px; z-index: 900;
  width: 44px; height: 44px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.125rem; color: var(--accent);
  background: var(--card); border: 1px solid var(--bdr);
  backdrop-filter: blur(12px);
  opacity: 0; pointer-events: none; transform: translateY(8px);
  transition: opacity 0.3s, transform 0.3s, border-color 0.2s;
}
#scroll-top.show { opacity: 1; pointer-events: auto; transform: none; }
#scroll-top:hover { border-color: var(--bdr-hover); }

/* ── 15  PROJECTS PAGE ────────────────────────────────────────────────── */
.page-hero {
  background: var(--bg-0); border-bottom: 1px solid var(--bdr);
  padding: calc(var(--nav-h) + 56px) 0 56px;
}
.page-hero-inner { max-width: var(--max-w); margin: 0 auto; padding: var(--pad); }
.page-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.25rem);
  font-weight: 800; letter-spacing: -0.03em; line-height: 1.1;
  color: var(--t-high); margin-bottom: 14px;
}
.page-sub { font-size: 1.0625rem; color: var(--t-mid); line-height: 1.75; max-width: 560px; }
.section-alt { background: var(--bg-2); }
.section + .section { border-top: 1px solid var(--bdr); }

/* ── 16  VIEW TRANSITIONS ─────────────────────────────────────────────── */
@view-transition { navigation: auto; }
::view-transition-old(root) { animation: fade-out 0.22s ease; }
::view-transition-new(root) { animation: fade-in  0.22s ease; }
@keyframes fade-out { to   { opacity: 0; } }
@keyframes fade-in  { from { opacity: 0; } }

/* ── 17  RESPONSIVE ───────────────────────────────────────────────────── */
@media (max-width: 1024px) {
  .hero-body  { grid-template-columns: 1fr; gap: 0; }
  .hero-card  { display: none; }
  .pro-grid   { grid-template-columns: 1fr; }
}
@media (max-width: 860px) {
  .about-layout    { grid-template-columns: 1fr; gap: 32px; }
  .about-photo-col { flex-direction: row; align-items: center; gap: 20px; position: static; }
  .profile-ring-wrap { width: 96px; height: 96px; }
  .lang-col        { align-items: flex-start; }
  .contact-layout  { grid-template-columns: 1fr; gap: 44px; }
  .exp-role-entry  { grid-template-columns: 1fr; gap: 10px; }
  .exp-role-left   { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
  .exp-role-period { margin-bottom: 0; }
  .exp-role-now    { margin-top: 0; }
}
@media (max-width: 768px) {
  :root { --nav-h: 60px; --pad: 0 20px; }
  .section     { padding: 72px 0; }
  .nav-links,
  .nav-cta     { display: none; }
  .burger      { display: flex; }
  .hero-stats  { gap: 20px; }
  .page-hero   { padding-top: calc(var(--nav-h) + 36px); }
  footer       { justify-content: center; text-align: center; }
  #scroll-top  { bottom: 20px; right: 20px; }
}
@media (max-width: 520px) {
  .cta-row       { flex-direction: column; align-items: stretch; }
  .cta-row a     { justify-content: center; }
  .about-cards   { grid-template-columns: 1fr; }
  .hero-name     { font-size: 2.5rem; }
  .hero-stats    { gap: 16px; }
  .h-stat-n      { font-size: 1.5rem; }
  .skills-layout { grid-template-columns: 1fr; }
  .pro-card      { padding: 22px 20px; }
  .edu-head      { flex-direction: column; gap: 4px; }
}

/* ── 18  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;
  }
  .r { opacity: 1; transform: none; }
  .hero-name .c { opacity: 1; transform: none; }
}