/* ============================================================
   SHIVAM SAHANI — PORTFOLIO STYLESHEET
   Design language: dark "neural network" theme — indigo/violet
   + cyan accents, glassmorphism surfaces, restrained CSS 3D.
   ============================================================ */

/* ---------- 1. DESIGN TOKENS ---------- */

:root {
  /* Color */
  --bg: #0a0d14;
  --bg-alt: #0d1120;
  --bg-elevated: #10142399;
  --surface: rgba(255, 255, 255, 0.045);
  --surface-strong: rgba(255, 255, 255, 0.07);
  --surface-border: rgba(255, 255, 255, 0.09);
  --surface-border-hover: rgba(255, 255, 255, 0.18);

  --accent: #6c63ff;         /* indigo/violet — primary */
  --accent-soft: #6c63ff26;
  --accent-2: #22d3ee;       /* cyan — secondary */
  --accent-2-soft: #22d3ee26;
  --accent-gradient: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);

  --text: #eaecf5;
  --text-dim: #8d93ac;
  --text-dimmer: #5b6178;

  --success: #34d399;
  --error: #fb7185;

  /* Typography */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Layout */
  --max-width: 1180px;
  --radius-sm: 10px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --nav-height: 76px;

  /* Motion */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --transition-fast: 0.2s var(--ease);
  --transition-med: 0.4s var(--ease);
  --transition-slow: 0.8s var(--ease);
}

/* ---------- 2. RESET ---------- */
* { margin: 0; padding: 0; box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  overflow-x: hidden;
}

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

/* subtle background texture: layered radial glows, fixed so it never repeats per-section */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(900px 500px at 15% -10%, var(--accent-soft), transparent 60%),
    radial-gradient(700px 500px at 100% 20%, var(--accent-2-soft), transparent 60%),
    var(--bg);
  pointer-events: none;
}

/* faint grid, evokes a coordinate space / feature-map — ties to the AI subject */
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at 50% 0%, black, transparent 75%);
  pointer-events: none;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

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

::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--surface-border-hover); border-radius: 10px; }

/* ---------- 3. CURSOR GLOW ---------- */
.cursor-glow {
  position: fixed;
  top: 0; left: 0;
  width: 420px; height: 420px;
  margin-left: -210px; margin-top: -210px;
  background: radial-gradient(circle, var(--accent-soft) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  z-index: 1;
  transform: translate3d(-500px, -500px, 0);
  transition: transform 0.12s linear;
  will-change: transform;
}
@media (max-width: 900px), (hover: none) {
  .cursor-glow { display: none; }
}

/* ---------- 4. NAVIGATION ---------- */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background var(--transition-med), border-color var(--transition-med), backdrop-filter var(--transition-med);
}
.navbar.scrolled {
  background: rgba(10, 13, 20, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  -webkit-backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--surface-border);
}

.nav-container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  flex-shrink: 0;
}
.nav-logo-mark {
  display: grid;
  place-items: center;
  width: 34px; height: 34px;
  border-radius: 9px;
  background: var(--accent-gradient);
  color: #060810;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 30px;
  flex-wrap: wrap;
}
.nav-link {
  position: relative;
  font-size: 0.92rem;
  color: var(--text-dim);
  padding: 6px 0;
  transition: color var(--transition-fast);
}
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 0%; height: 1.5px;
  background: var(--accent-gradient);
  transition: width var(--transition-fast);
}
.nav-link:hover { color: var(--text); }
.nav-link:hover::after,
.nav-link.active::after { width: 100%; }
.nav-link.active { color: var(--text); }

.nav-cta {
  flex-shrink: 0;
  font-size: 0.86rem;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: 999px;
  border: 1px solid var(--surface-border-hover);
  transition: border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}
.nav-cta:hover {
  background: var(--surface-strong);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px; height: 32px;
  flex-shrink: 0;
}
.hamburger span {
  display: block;
  width: 100%; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}
.hamburger[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.hamburger[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 5. BUTTONS ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 999px;
  font-size: 0.92rem;
  font-weight: 600;
  font-family: var(--font-body);
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}
.btn-small { padding: 9px 18px; font-size: 0.82rem; }

.btn-primary {
  background: var(--accent-gradient);
  color: #060810;
  box-shadow: 0 8px 24px -8px var(--accent-soft), 0 0 0 1px rgba(255,255,255,0.05) inset;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 32px -10px rgba(108, 99, 255, 0.55), 0 0 0 1px rgba(255,255,255,0.08) inset;
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--surface-border-hover);
  backdrop-filter: blur(8px);
}
.btn-secondary:hover {
  border-color: var(--accent-2);
  background: var(--surface-strong);
  transform: translateY(-2px);
}

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

/* ---------- 6. HERO ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.65;
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 60px 32px;
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: 40px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-2);
  letter-spacing: 0.02em;
  margin-bottom: 22px;
  padding: 7px 14px 7px 10px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
}
.eyebrow-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(52, 211, 153, 0.18);
  animation: pulse-dot 2.2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.35); }
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 5.4vw, 4.1rem);
  font-weight: 700;
  line-height: 1.06;
  letter-spacing: -0.02em;
  margin-bottom: 18px;
}
.hero-title-accent {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-role {
  font-family: var(--font-mono);
  font-size: clamp(1rem, 1.9vw, 1.25rem);
  color: var(--text-dim);
  margin-bottom: 22px;
  min-height: 1.6em;
}
.typed-cursor {
  color: var(--accent-2);
  animation: blink 1s step-end infinite;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-desc {
  max-width: 46ch;
  color: var(--text-dim);
  font-size: 1.02rem;
  margin-bottom: 34px;
}

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

/* --- Hero 3D signature element: rotating wireframe icosahedron-like polyhedron --- */
.hero-3d {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 420px;
  perspective: 1200px;
}

.poly-scene {
  position: relative;
  width: 240px;
  height: 240px;
  transform-style: preserve-3d;
}

.poly {
  position: absolute;
  inset: 0;
  transform-style: preserve-3d;
  animation: spin-poly 22s linear infinite;
  will-change: transform;
}
@keyframes spin-poly {
  from { transform: rotateX(0deg) rotateY(0deg) rotateZ(0deg); }
  to   { transform: rotateX(360deg) rotateY(360deg) rotateZ(0deg); }
}

.poly-face {
  position: absolute;
  width: 240px; height: 240px;
  border: 1px solid var(--accent-2);
  border-radius: 18px;
  background: linear-gradient(135deg, rgba(108,99,255,0.10), rgba(34,211,238,0.05));
  box-shadow: 0 0 40px -10px rgba(108, 99, 255, 0.4);
  backdrop-filter: blur(2px);
}
.f1 { transform: rotateY(0deg) translateZ(120px); }
.f2 { transform: rotateY(90deg) translateZ(120px); }
.f3 { transform: rotateY(180deg) translateZ(120px); }
.f4 { transform: rotateY(-90deg) translateZ(120px); }
.f5 { transform: rotateX(90deg) translateZ(120px); }
.f6 { transform: rotateX(-90deg) translateZ(120px); }

.poly-node {
  position: absolute;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 16px 4px rgba(34, 211, 238, 0.7);
  top: 50%; left: 50%;
  margin: -5px 0 0 -5px;
}
.n1 { transform: translateZ(150px) translateY(-80px); }
.n2 { transform: translateZ(-150px) translateX(70px); }
.n3 { transform: translateZ(60px) translateX(-110px) translateY(90px); }
.n4 { transform: translateZ(-60px) translateY(110px); }

.poly-ring {
  position: absolute;
  inset: -40px;
  border: 1px solid var(--surface-border);
  border-radius: 50%;
  animation: rotate-ring 30s linear infinite;
}
.poly-ring-2 {
  inset: -80px;
  border-color: var(--surface-border);
  animation-duration: 46s;
  animation-direction: reverse;
}
@keyframes rotate-ring {
  from { transform: rotateX(70deg) rotateZ(0deg); }
  to   { transform: rotateX(70deg) rotateZ(360deg); }
}

.scroll-cue {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-dimmer);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}
.scroll-cue-line {
  width: 1px; height: 34px;
  background: linear-gradient(var(--accent-2), transparent);
  position: relative;
  overflow: hidden;
}
.scroll-cue-line::after {
  content: "";
  position: absolute;
  top: -100%; left: 0;
  width: 100%; height: 100%;
  background: var(--accent-2);
  animation: scroll-line 1.8s ease-in-out infinite;
}
@keyframes scroll-line {
  0% { top: -100%; }
  60%, 100% { top: 100%; }
}

/* ---------- 7. SECTIONS (shared) ---------- */
.section { padding: 120px 0; position: relative; }
.section-alt { background: linear-gradient(180deg, transparent, rgba(255,255,255,0.015) 8%, rgba(255,255,255,0.015) 92%, transparent); }

.section-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-2);
  letter-spacing: 0.06em;
  margin-bottom: 14px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 3.4vw, 2.6rem);
  font-weight: 600;
  letter-spacing: -0.015em;
  margin-bottom: 12px;
}

.section-sub {
  color: var(--text-dim);
  max-width: 56ch;
  margin-bottom: 56px;
  font-size: 1.02rem;
}
.section-title + .section-sub { margin-top: -4px; }
.section-title:last-of-type { margin-bottom: 56px; }

/* scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* generic glass surface used by cards */
.tilt-card {
  transform-style: preserve-3d;
  will-change: transform;
}

/* ---------- 8. ABOUT ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 24px;
  align-items: start;
}

.about-card {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 40px;
  backdrop-filter: blur(10px);
  overflow: hidden;
  transition: border-color var(--transition-med), transform var(--transition-fast);
}
.about-card:hover { border-color: var(--surface-border-hover); }
.about-card-glow {
  position: absolute;
  top: -60%; right: -30%;
  width: 60%; height: 200%;
  background: radial-gradient(circle, var(--accent-soft), transparent 70%);
  pointer-events: none;
}
.about-card p { color: var(--text-dim); margin-bottom: 16px; }
.about-card p:last-of-type { margin-bottom: 0; }
.about-lead { color: var(--text) !important; font-size: 1.08rem; }
.about-card strong { color: var(--text); font-weight: 600; }

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 24px;
}

.tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-dim);
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--surface-border);
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.stat-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 26px 28px;
  transition: border-color var(--transition-med);
}
.stat-card:hover { border-color: var(--accent-2); }
.stat-number {
  display: block;
  font-family: var(--font-display);
  font-size: 2.6rem;
  font-weight: 700;
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat-label { color: var(--text-dim); font-size: 0.88rem; }

/* ---------- 9. SKILLS ---------- */
.skills-groups { display: flex; flex-direction: column; gap: 44px; }
.skills-group-title {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-dim);
  margin-bottom: 18px;
  letter-spacing: 0.03em;
}
.skills-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
}
.skill-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 24px;
  transition: border-color var(--transition-med), background var(--transition-med);
}
.skill-card:hover { border-color: var(--accent); background: var(--surface-strong); }
.skill-icon {
  display: inline-grid;
  place-items: center;
  min-width: 40px; height: 40px;
  padding: 0 8px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent-2);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 16px;
}
.skill-card h4 { font-family: var(--font-display); font-size: 1.05rem; margin-bottom: 6px; }
.skill-card p { color: var(--text-dim); font-size: 0.88rem; }

/* ---------- 10. PROJECTS ---------- */
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(310px, 1fr));
  gap: 24px;
}
.project-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-med), box-shadow var(--transition-med);
  display: flex;
  flex-direction: column;
}
.project-card:hover { border-color: var(--surface-border-hover); box-shadow: 0 24px 48px -24px rgba(0,0,0,0.5); }

.project-media {
  height: 160px;
  background:
    linear-gradient(135deg, rgba(108,99,255,0.14), rgba(34,211,238,0.08)),
    repeating-linear-gradient(45deg, rgba(255,255,255,0.02) 0 2px, transparent 2px 14px);
  display: grid;
  place-items: center;
  border-bottom: 1px solid var(--surface-border);
}
.project-media-placeholder {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: rgba(255,255,255,0.18);
}

.project-body { padding: 26px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.project-body h3 { font-family: var(--font-display); font-size: 1.15rem; }
.project-body p { color: var(--text-dim); font-size: 0.92rem; flex: 1; }
.project-tech { display: flex; flex-wrap: wrap; gap: 8px; }
.project-links { display: flex; gap: 10px; margin-top: 6px; }

/* ---------- 11. EDUCATION TIMELINE ---------- */
.timeline {
  position: relative;
  padding-left: 32px;
  max-width: 760px;
}
.timeline::before {
  content: "";
  position: absolute;
  left: 5px; top: 6px; bottom: 6px;
  width: 1.5px;
  background: linear-gradient(var(--accent), var(--accent-2));
  opacity: 0.4;
}
.timeline-item { position: relative; margin-bottom: 40px; }
.timeline-item:last-child { margin-bottom: 0; }
.timeline-marker {
  position: absolute;
  left: -32px; top: 6px;
  width: 11px; height: 11px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent-2);
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.12);
}
.timeline-content {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 26px 30px;
  transition: border-color var(--transition-med);
}
.timeline-content:hover { border-color: var(--surface-border-hover); }
.timeline-date {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--accent-2);
  display: block;
  margin-bottom: 8px;
}
.timeline-content h3 { font-family: var(--font-display); font-size: 1.15rem; margin-bottom: 4px; }
.timeline-place { color: var(--text-dim); font-size: 0.9rem; margin-bottom: 10px; font-weight: 500; }
.timeline-content p:last-child { color: var(--text-dim); font-size: 0.92rem; }

/* ---------- 12. CERTIFICATIONS ---------- */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 20px;
}
.cert-card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  padding: 28px;
  transition: border-color var(--transition-med), transform var(--transition-fast);
}
.cert-card:hover { border-color: var(--accent); }
.cert-icon {
  display: inline-grid;
  place-items: center;
  width: 42px; height: 42px;
  border-radius: 10px;
  background: var(--accent-2-soft);
  color: var(--accent-2);
  font-size: 1.05rem;
  margin-bottom: 18px;
}
.cert-card h3 { font-family: var(--font-display); font-size: 1.05rem; margin-bottom: 8px; }
.cert-org { color: var(--text); font-size: 0.88rem; margin-bottom: 2px; }
.cert-date { color: var(--text-dimmer); font-size: 0.8rem; font-family: var(--font-mono); margin-bottom: 20px; }

/* ---------- 13. RESUME CTA ---------- */
.resume-section { padding: 60px 0 120px; }
.resume-card {
  position: relative;
  overflow: hidden;
  text-align: center;
  padding: 64px 40px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--surface-border);
}
.resume-card-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(600px 260px at 50% 0%, var(--accent-soft), transparent 70%);
  pointer-events: none;
}
.resume-card h2 { font-family: var(--font-display); font-size: clamp(1.6rem, 3vw, 2.1rem); margin-bottom: 12px; }
.resume-card p { color: var(--text-dim); max-width: 46ch; margin: 0 auto 28px; }

/* ---------- 14. CONTACT ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 24px;
}
.contact-info { display: flex; flex-direction: column; gap: 12px; }
.contact-link {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 18px 22px;
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), transform var(--transition-fast), background var(--transition-fast);
}
.contact-link:hover {
  border-color: var(--accent-2);
  background: var(--surface-strong);
  transform: translateX(4px);
}
.contact-link-icon {
  display: grid;
  place-items: center;
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent-2);
  font-family: var(--font-mono);
  font-size: 0.95rem;
  flex-shrink: 0;
}
.contact-link-label { display: block; font-size: 0.76rem; color: var(--text-dimmer); }
.contact-link-value { display: block; font-size: 0.94rem; color: var(--text); word-break: break-word; }

.contact-form {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 36px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-group { display: flex; flex-direction: column; gap: 8px; }
.form-group label { font-size: 0.84rem; color: var(--text-dim); }
.form-group input,
.form-group textarea {
  background: rgba(255,255,255,0.03);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  font-size: 0.95rem;
  transition: border-color var(--transition-fast), background var(--transition-fast);
  resize: vertical;
}
.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--accent-2);
  background: rgba(255,255,255,0.05);
}
.form-group.has-error input,
.form-group.has-error textarea { border-color: var(--error); }
.form-error {
  font-size: 0.78rem;
  color: var(--error);
  min-height: 1em;
}
.form-submit { margin-top: 6px; }
.form-success {
  display: none;
  font-size: 0.86rem;
  color: var(--success);
  text-align: center;
}
.form-success.is-visible { display: block; }

/* ---------- 15. FOOTER ---------- */
.footer { border-top: 1px solid var(--surface-border); padding: 32px 0; }
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-inner p { color: var(--text-dimmer); font-size: 0.86rem; }
.footer-socials { display: flex; gap: 10px; }
.footer-socials a {
  display: grid;
  place-items: center;
  width: 38px; height: 38px;
  border-radius: 10px;
  border: 1px solid var(--surface-border);
  color: var(--text-dim);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}
.footer-socials a:hover { border-color: var(--accent-2); color: var(--accent-2); transform: translateY(-2px); }

/* ---------- 16. BACK TO TOP ---------- */
.back-to-top {
  position: fixed;
  bottom: 28px; right: 28px;
  z-index: 90;
  width: 46px; height: 46px;
  border-radius: 50%;
  background: var(--surface-strong);
  border: 1px solid var(--surface-border-hover);
  backdrop-filter: blur(10px);
  color: var(--text);
  font-size: 1.1rem;
  display: grid;
  place-items: center;
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
}
.back-to-top.is-visible { opacity: 1; transform: translateY(0); pointer-events: auto; }
.back-to-top:hover { border-color: var(--accent-2); color: var(--accent-2); }

/* ---------- 17. RESPONSIVE ---------- */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-3d { height: 300px; order: -1; }
  .poly-scene, .poly-face { width: 180px; height: 180px; }
  .f1, .f2, .f3, .f4, .f5, .f6 { transform: none; } /* recompute below via JS-free fallback */
  .f1 { transform: rotateY(0deg) translateZ(90px); }
  .f2 { transform: rotateY(90deg) translateZ(90px); }
  .f3 { transform: rotateY(180deg) translateZ(90px); }
  .f4 { transform: rotateY(-90deg) translateZ(90px); }
  .f5 { transform: rotateX(90deg) translateZ(90px); }
  .f6 { transform: rotateX(-90deg) translateZ(90px); }

  .about-grid { grid-template-columns: 1fr; }
  .about-stats { flex-direction: row; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 860px) {
  .nav-links {
    position: fixed;
    top: var(--nav-height); left: 0; right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    background: rgba(10, 13, 20, 0.97);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--surface-border);
    padding: 12px 32px 24px;
    transform: translateY(-12px);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--transition-med), opacity var(--transition-med), visibility var(--transition-med);
  }
  .nav-links.is-open { transform: translateY(0); opacity: 1; visibility: visible; }
  .nav-links li { width: 100%; }
  .nav-link { display: block; padding: 12px 0; width: 100%; }
  .nav-cta { display: none; }
  .hamburger { display: flex; }

  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .btn { width: 100%; }
}

@media (max-width: 640px) {
  .container, .nav-container, .hero-inner { padding-left: 20px; padding-right: 20px; }
  .section { padding: 84px 0; }
  .about-card { padding: 28px; }
  .about-stats { flex-direction: column; }
  .resume-card { padding: 44px 24px; }
  .contact-form { padding: 26px; }
  .hero-3d { height: 220px; }
  .poly-scene, .poly-face { width: 140px; height: 140px; }
  .f1 { transform: rotateY(0deg) translateZ(70px); }
  .f2 { transform: rotateY(90deg) translateZ(70px); }
  .f3 { transform: rotateY(180deg) translateZ(70px); }
  .f4 { transform: rotateY(-90deg) translateZ(70px); }
  .f5 { transform: rotateX(90deg) translateZ(70px); }
  .f6 { transform: rotateX(-90deg) translateZ(70px); }
}