/* ==========================================================================
   Modern interactive redesign — David Tan portfolio
   ========================================================================== */

:root {
  --bg: #05050a;
  --bg-soft: #0a0a14;
  --surface: rgba(255, 255, 255, 0.045);
  --surface-strong: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.1);
  --text: #f4f4f8;
  --text-dim: #9a9ab0;
  --accent: #7c5cff;
  --accent-2: #ff5c8a;
  --accent-3: #4ce0d2;
  --accent-4: #ffb347;
  --grad-1: linear-gradient(135deg, var(--accent), var(--accent-2));
  --grad-2: linear-gradient(135deg, var(--accent-3), var(--accent));
  --radius: 20px;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Poppins', sans-serif;
  overflow-x: hidden;
  cursor: none;
}

@media (hover: none), (max-width: 900px) {
  body { cursor: auto; }
  .cursor-dot, .cursor-ring { display: none !important; }
}

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

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

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

/* ---------- custom cursor ---------- */
.cursor-dot,
.cursor-ring {
  position: fixed;
  top: 0; left: 0;
  border-radius: 50%;
  pointer-events: none;
  z-index: 9999;
  transform: translate(-50%, -50%);
  mix-blend-mode: difference;
}
.cursor-dot {
  width: 8px; height: 8px;
  background: #fff;
  transition: opacity .2s;
}
.cursor-ring {
  width: 36px; height: 36px;
  border: 1.5px solid rgba(255,255,255,.6);
  transition: width .25s var(--ease), height .25s var(--ease), border-color .25s;
}
.cursor-ring.is-active {
  width: 64px; height: 64px;
  border-color: var(--accent);
  background: rgba(124,92,255,.1);
}

/* ---------- background mesh / noise ---------- */
.mesh-bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
.mesh-bg .blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: .55;
  will-change: transform;
}
.mesh-bg .blob-1 {
  width: 45vw; height: 45vw;
  top: -10%; left: -10%;
  background: var(--accent);
  animation: float1 22s ease-in-out infinite;
}
.mesh-bg .blob-2 {
  width: 38vw; height: 38vw;
  top: 30%; right: -10%;
  background: var(--accent-2);
  animation: float2 26s ease-in-out infinite;
}
.mesh-bg .blob-3 {
  width: 34vw; height: 34vw;
  bottom: -15%; left: 20%;
  background: var(--accent-3);
  animation: float3 30s ease-in-out infinite;
}
@keyframes float1 {
  0%, 100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(8%, 10%) scale(1.15); }
}
@keyframes float2 {
  0%, 100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(-10%, 8%) scale(1.1); }
}
@keyframes float3 {
  0%, 100% { transform: translate(0,0) scale(1); }
  50% { transform: translate(6%, -8%) scale(1.2); }
}
.grain {
  position: fixed;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  opacity: .035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='120' height='120'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- layout helpers ---------- */
.wrap { position: relative; z-index: 2; }
.container-m {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 24px;
}
section { position: relative; padding: 140px 0; }
@media (max-width: 768px) { section { padding: 90px 0; } }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .78rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--text-dim);
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 7px 16px;
  border-radius: 100px;
  backdrop-filter: blur(10px);
}
.eyebrow .dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--accent-3);
  box-shadow: 0 0 10px var(--accent-3);
}

.section-head { margin-bottom: 60px; }
.section-head h2 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  margin: 18px 0 14px;
  letter-spacing: -0.02em;
}
.section-head p { color: var(--text-dim); font-size: 1.05rem; max-width: 560px; }
.section-head.center { text-align: center; }
.section-head.center p { margin: 0 auto; }

.grad-text {
  background: var(--grad-1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* reveal on scroll */
.reveal {
  opacity: 0;
  transform: translateY(36px);
  transition: opacity .9s var(--ease), transform .9s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: .08s; }
.reveal-delay-2 { transition-delay: .16s; }
.reveal-delay-3 { transition-delay: .24s; }
.reveal-delay-4 { transition-delay: .32s; }
.reveal-delay-5 { transition-delay: .4s; }

/* ---------- nav ---------- */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 500;
  padding: 22px 0;
  transition: padding .35s var(--ease), background .35s, border-color .35s;
}
.nav.scrolled {
  padding: 12px 0;
  background: rgba(5,5,10,.7);
  backdrop-filter: blur(16px) saturate(160%);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  font-weight: 700;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 10px;
  letter-spacing: -0.02em;
}
.nav-logo .sq {
  width: 30px; height: 30px;
  border-radius: 9px;
  background: var(--grad-1);
  display: inline-block;
}
.nav-links {
  display: flex;
  gap: 6px;
  list-style: none;
  margin: 0; padding: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 100px;
  padding: 6px;
}
.nav-links a {
  display: block;
  padding: 9px 18px;
  font-size: .9rem;
  border-radius: 100px;
  color: var(--text-dim);
  transition: color .25s, background .25s;
}
.nav-links a:hover { color: var(--text); }
.nav-links li.active a { color: #fff; background: var(--surface-strong); }
.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 100px;
  background: var(--grad-1);
  font-size: .88rem;
  font-weight: 600;
  color: #fff;
}
.nav-toggle {
  display: none;
  width: 40px; height: 40px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: #fff;
  align-items: center;
  justify-content: center;
}
@media (max-width: 900px) {
  .nav-links, .nav-cta { display: none; }
  .nav-toggle { display: flex; }
  .nav-links.mobile-open {
    display: flex;
    position: fixed;
    top: 74px; left: 24px; right: 24px;
    flex-direction: column;
    background: rgba(10,10,20,.97);
    backdrop-filter: blur(16px);
  }
  .nav-links.mobile-open a { padding: 14px 18px; text-align: center; }
}

/* magnetic buttons */
.btn-m {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 32px;
  border-radius: 100px;
  font-weight: 600;
  font-size: .95rem;
  border: 1px solid var(--border);
  overflow: hidden;
  transition: border-color .3s;
}
.btn-m.primary {
  background: var(--grad-1);
  color: #fff;
  border: none;
}
.btn-m.ghost {
  background: var(--surface);
  color: var(--text);
}
.btn-m.ghost:hover { border-color: var(--accent); }
.btn-m .arrow { transition: transform .3s var(--ease); }
.btn-m:hover .arrow { transform: translateX(4px); }

/* ---------- hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 120px;
  position: relative;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: 50px;
  align-items: center;
}
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
}
.hero h1 {
  font-size: clamp(2.6rem, 6.4vw, 4.6rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 22px 0 22px;
}
.hero h1 .line { display: block; overflow: hidden; }
.hero h1 .line span { display: inline-block; }
.hero p.lead { color: var(--text-dim); font-size: 1.15rem; max-width: 480px; margin-bottom: 36px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}
.hero-card {
  position: relative;
  width: 100%;
  max-width: 380px;
  border-radius: 28px;
  padding: 3px;
}
.hero-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: 28px;
  background: var(--grad-1);
  animation: spin-glow 8s linear infinite;
  z-index: 0;
}
@keyframes spin-glow {
  0% { filter: hue-rotate(0deg); }
  100% { filter: hue-rotate(360deg); }
}
.hero-card-inner {
  border-radius: 26px;
  background: var(--bg-soft);
  overflow: hidden;
  position: relative;
  z-index: 1;
}
.hero-card-inner img {
  width: 100%; display: block;
  filter: saturate(1.05);
}
.floating-chip {
  position: absolute;
  z-index: 5;
  padding: 12px 18px;
  border-radius: 16px;
  background: rgba(15,15,25,.75);
  border: 1px solid var(--border);
  backdrop-filter: blur(14px);
  font-size: .82rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
  animation: bob 5s ease-in-out infinite;
}
.floating-chip.c1 { top: 6%; left: -16px; animation-delay: 0s; }
.floating-chip.c2 { bottom: 10%; right: -16px; animation-delay: 1.2s; }
.floating-chip.c3 { top: 42%; right: -16px; animation-delay: .6s; }
@media (max-width: 900px) {
  .floating-chip.c1 { left: 4px; }
  .floating-chip.c2 { right: 4px; }
  .floating-chip.c3 { display: none; }
}
@keyframes bob {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}
.scroll-cue {
  position: absolute;
  bottom: 36px; left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center;
  gap: 10px;
  color: var(--text-dim);
  font-size: .75rem;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.scroll-cue .stick {
  width: 1px; height: 40px;
  background: linear-gradient(var(--accent), transparent);
  position: relative;
  overflow: hidden;
}
.scroll-cue .stick::after {
  content: '';
  position: absolute;
  top: -100%; left: 0; right: 0; height: 100%;
  background: #fff;
  animation: scrolldown 2s ease-in-out infinite;
}
@keyframes scrolldown {
  0% { top: -100%; } 60% { top: 100%; } 100% { top: 100%; }
}

/* ---------- marquee ---------- */
.marquee-band {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 26px 0;
  overflow: hidden;
  background: var(--surface);
}
.marquee-track {
  display: flex;
  width: max-content;
  gap: 60px;
  animation: marquee 30s linear infinite;
}
.marquee-track span {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-dim);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 14px;
}
.marquee-track span i { color: var(--accent-3); font-size: .5rem; }
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ---------- bento / about ---------- */
.bento {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
}
.bento .card {
  grid-column: span 6;
  min-width: 0;
}
.resume-grid {
  grid-template-columns: 1fr;
  gap: 40px;
}
@media (min-width: 900px) {
  .resume-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .bento .card-photo { grid-column: span 2; grid-row: span 2; }
  .bento .card-intro { grid-column: span 4; }
  .bento .card-info { grid-column: span 2; }
  .bento .card-stat { grid-column: span 2; }
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  position: relative;
  overflow: hidden;
  backdrop-filter: blur(10px);
  transition: transform .4s var(--ease), border-color .4s;
}
.card:hover { border-color: rgba(124,92,255,.4); }
.card-photo { padding: 0; display: flex; }
.card-photo img { width: 100%; height: 100%; object-fit: cover; min-height: 260px; }
.card-intro h3 { font-size: 1.6rem; margin-bottom: 12px; font-weight: 600; }
.card-intro p { color: var(--text-dim); line-height: 1.7; }
.info-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 14px; }
.info-list li { display: flex; justify-content: space-between; gap: 12px; font-size: .92rem; border-bottom: 1px dashed var(--border); padding-bottom: 12px; }
.info-list li span:first-child { color: var(--text-dim); flex-shrink: 0; }
.info-list li span:last-child { font-weight: 500; overflow-wrap: anywhere; text-align: right; }
.card-stat { display: flex; flex-direction: column; justify-content: center; align-items: flex-start; }
.card-stat .num { font-size: 3rem; font-weight: 700; background: var(--grad-2); -webkit-background-clip: text; background-clip: text; color: transparent; line-height: 1; }
.card-stat .label { color: var(--text-dim); margin-top: 8px; font-size: .9rem; }

/* ---------- timeline / resume ---------- */
.timeline { position: relative; margin-top: 20px; min-width: 0; }
.timeline::before {
  content: '';
  position: absolute;
  left: 20px; top: 0; bottom: 0;
  width: 1px;
  background: linear-gradient(var(--border), transparent);
}
@media (max-width: 640px) { .timeline::before { left: 10px; } }
.timeline-item {
  position: relative;
  padding-left: 60px;
  margin-bottom: 40px;
}
@media (max-width: 640px) { .timeline-item { padding-left: 36px; } }
.timeline-item::before {
  content: '';
  position: absolute;
  left: 14px; top: 6px;
  width: 13px; height: 13px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 4px var(--surface);
}
@media (max-width: 640px) { .timeline-item::before { left: 4px; } }
.timeline-item .date {
  display: inline-block;
  font-size: .78rem;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent-3);
  margin-bottom: 8px;
  font-weight: 600;
}
.timeline-item h3 { font-size: 1.3rem; font-weight: 600; margin: 0 0 4px; }
.timeline-item .position { color: var(--text-dim); font-size: .9rem; }
.timeline-item .detail { margin-top: 14px; display: flex; flex-direction: column; gap: 8px; }
.timeline-item .detail p { color: var(--text-dim); font-size: .92rem; line-height: 1.6; margin: 0; }
.timeline-item .detail p b { color: var(--accent-3); font-weight: 600; }

/* ---------- services ---------- */
.service-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
@media (max-width: 900px) { .service-grid { grid-template-columns: 1fr; } }
.service-card {
  position: relative;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 40px 32px;
  overflow: hidden;
  transition: transform .35s var(--ease), border-color .35s;
  display: block;
}
.service-card:hover { transform: translateY(-6px); border-color: var(--accent); }
.service-card .spot {
  position: absolute;
  width: 260px; height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(124,92,255,.25), transparent 70%);
  left: var(--x, 50%); top: var(--y, 50%);
  transform: translate(-50%, -50%);
  opacity: 0;
  transition: opacity .3s;
  pointer-events: none;
}
.service-card:hover .spot { opacity: 1; }
.service-card .icon-wrap {
  width: 56px; height: 56px;
  border-radius: 16px;
  background: var(--grad-1);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 26px;
  color: #fff;
}
.service-card h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 10px; }
.service-card p { color: var(--text-dim); font-size: .92rem; line-height: 1.6; }
.service-card .go {
  margin-top: 22px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: .85rem;
  color: var(--accent-3);
  font-weight: 600;
}
.service-card.wide { grid-column: 1 / -1; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
@media (max-width: 640px) { .service-card.wide { flex-direction: column; text-align: center; } }

/* ---------- skills ---------- */
.skills-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px 40px; }
@media (max-width: 768px) { .skills-grid { grid-template-columns: 1fr; } }
.skill-row { }
.skill-row .top { display: flex; justify-content: space-between; margin-bottom: 10px; font-size: .95rem; font-weight: 500; }
.skill-row .top .pct { color: var(--accent-3); font-weight: 600; }
.skill-bar { height: 8px; border-radius: 100px; background: var(--surface); border: 1px solid var(--border); overflow: hidden; }
.skill-bar .fill {
  height: 100%;
  border-radius: 100px;
  background: var(--grad-1);
  width: 0%;
  transition: width 1.4s var(--ease);
}

/* ---------- projects ---------- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}
@media (max-width: 900px) { .project-grid { grid-template-columns: 1fr; } }
.project-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
  aspect-ratio: 4/3.1;
  display: block;
  grid-column: span 1;
}
.project-card.big { grid-column: span 2; }
@media (max-width: 900px) { .project-card.big { grid-column: span 1; } }
.project-card .bgimg {
  position: absolute; inset: 0;
  background-size: cover;
  background-position: center;
  transform: scale(1.08);
  transition: transform .6s var(--ease), filter .6s;
  filter: grayscale(.4) brightness(.6);
}
.project-card:hover .bgimg { transform: scale(1); filter: grayscale(0) brightness(.75); }
.project-card::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,.85) 0%, rgba(0,0,0,.1) 55%, rgba(0,0,0,.35) 100%);
}
.project-card .content {
  position: absolute; left: 0; right: 0; bottom: 0;
  padding: 26px;
  z-index: 2;
}
.project-card .tag {
  display: inline-block;
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--accent-3);
  margin-bottom: 8px;
  font-weight: 600;
}
.project-card h3 {
  font-size: 1.25rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}
.project-card h3 .go {
  width: 30px; height: 30px;
  border-radius: 50%;
  background: rgba(255,255,255,.12);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: .85rem;
  transform: translateX(0) rotate(-45deg);
  transition: transform .35s var(--ease), background .35s;
}
.project-card:hover h3 .go { background: var(--accent); transform: translateX(4px) rotate(0deg); }

/* ---------- stats band ---------- */
.stats-band {
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 70px 0;
}
.stats-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; text-align: center; }
@media (max-width: 768px) { .stats-grid { grid-template-columns: repeat(2, 1fr); } }
.stats-grid .stat .num {
  font-size: clamp(2.2rem, 5vw, 3.2rem);
  font-weight: 700;
  background: var(--grad-1);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stats-grid .stat .label { color: var(--text-dim); font-size: .9rem; margin-top: 6px; }

/* ---------- CTA band ---------- */
.cta-band {
  text-align: center;
  border-radius: 32px;
  margin: 0 24px;
  padding: 80px 40px;
  background: linear-gradient(135deg, rgba(124,92,255,.15), rgba(255,92,138,.12));
  border: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.cta-band h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 700; margin-bottom: 14px; }
.cta-band p { color: var(--text-dim); margin-bottom: 30px; }

/* ---------- contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  margin-bottom: 50px;
}
@media (max-width: 900px) { .contact-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-card {
  min-width: 0;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px 24px;
  text-align: center;
  transition: transform .3s var(--ease), border-color .3s;
}
.contact-card:hover { transform: translateY(-4px); border-color: var(--accent); }
.contact-card .icon-wrap {
  width: 48px; height: 48px;
  margin: 0 auto 16px;
  border-radius: 14px;
  background: var(--grad-2);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem;
  color: #05050a;
}
.contact-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.contact-card p, .contact-card a { color: var(--text-dim); font-size: .9rem; overflow-wrap: anywhere; }

.contact-panel {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: stretch;
}
@media (max-width: 900px) { .contact-panel { grid-template-columns: 1fr; } }
.contact-panel .visual {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  min-height: 320px;
}
.contact-panel .visual img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; filter: grayscale(.3) brightness(.7); }
.contact-panel .visual .over {
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(124,92,255,.35), rgba(76,224,210,.25));
}
.form-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
}
.field { position: relative; margin-bottom: 22px; }
.field input, .field textarea {
  width: 100%;
  background: rgba(255,255,255,.03);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px 16px;
  color: var(--text);
  font-family: inherit;
  font-size: .95rem;
  transition: border-color .25s, background .25s;
}
.field input:focus, .field textarea:focus {
  outline: none;
  border-color: var(--accent);
  background: rgba(124,92,255,.06);
}
.field textarea { resize: vertical; min-height: 130px; }
.field input::placeholder, .field textarea::placeholder { color: var(--text-dim); }
.submit-btn {
  width: 100%;
  padding: 16px;
  border-radius: 12px;
  border: none;
  background: var(--grad-1);
  color: #fff;
  font-weight: 600;
  font-size: .95rem;
  cursor: pointer;
  transition: filter .25s, transform .2s;
}
.submit-btn:hover { filter: brightness(1.1); }
.submit-btn:active { transform: scale(.98); }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--border);
  padding: 70px 0 30px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}
@media (max-width: 900px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-grid > div { min-width: 0; }
.footer h4 { font-size: 1rem; margin-bottom: 20px; font-weight: 600; }
.footer p { color: var(--text-dim); font-size: .9rem; line-height: 1.7; }
.footer ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 12px; }
.footer ul a { color: var(--text-dim); font-size: .9rem; transition: color .2s, padding-left .2s; overflow-wrap: anywhere; }
.footer ul a:hover { color: var(--text); padding-left: 6px; }
.social-row { display: flex; gap: 10px; margin-top: 22px; }
.social-row a {
  width: 40px; height: 40px;
  border-radius: 50%;
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  transition: background .25s, border-color .25s, transform .25s;
}
.social-row a:hover { background: var(--grad-1); border-color: transparent; transform: translateY(-3px); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 26px;
  text-align: center;
  color: var(--text-dim);
  font-size: .85rem;
}
.footer-bottom img { vertical-align: middle; }

/* ---------- intro loader ---------- */
#intro-loader {
  position: fixed; inset: 0;
  z-index: 10000;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity .6s var(--ease), visibility .6s;
}
#intro-loader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.loader-word {
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  display: flex;
  gap: 2px;
}
.loader-word span { opacity: .15; animation: pulse-letter 1.2s ease-in-out infinite; }
@keyframes pulse-letter { 0%, 100% { opacity: .15; } 50% { opacity: 1; } }

/* ==========================================================================
   Case-study / project detail pages
   ========================================================================== */

.proj-hero {
  position: relative;
  min-height: 62vh;
  display: flex;
  align-items: flex-end;
  padding: 160px 0 70px;
  background-size: cover;
  background-position: center;
  overflow: hidden;
}
.proj-hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to top, var(--bg) 0%, rgba(5,5,10,.55) 55%, rgba(5,5,10,.35) 100%);
}
.proj-hero-inner { position: relative; z-index: 2; }
.proj-back {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: .85rem;
  font-weight: 600;
  color: var(--text-dim);
  margin-bottom: 22px;
  padding: 8px 16px 8px 12px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: rgba(10,10,20,.5);
  backdrop-filter: blur(10px);
  transition: color .25s, border-color .25s;
}
.proj-back:hover { color: #fff; border-color: var(--accent); }
.proj-hero h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  max-width: 760px;
  margin-top: 16px;
}

.proj-switcher {
  position: sticky;
  top: 0;
  z-index: 400;
  border-bottom: 1px solid var(--border);
  background: rgba(5,5,10,.75);
  backdrop-filter: blur(14px) saturate(160%);
  overflow-x: auto;
  scrollbar-width: none;
}
.proj-switcher::-webkit-scrollbar { display: none; }
.proj-switcher-track {
  display: flex;
  gap: 6px;
  padding: 14px 24px;
  width: max-content;
  min-width: 100%;
}
.proj-tab {
  white-space: nowrap;
  font-size: .86rem;
  font-weight: 500;
  color: var(--text-dim);
  padding: 8px 16px;
  border-radius: 100px;
  transition: color .25s, background .25s;
}
.proj-tab:hover { color: var(--text); }
.proj-tab.active { color: #fff; background: var(--surface-strong); font-weight: 600; }

.proj-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 50px;
  align-items: start;
}
@media (max-width: 960px) { .proj-layout { grid-template-columns: 1fr; } }

.prose h2 {
  font-size: 1.7rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  margin: 46px 0 18px;
}
.prose h2:first-child { margin-top: 0; }
.prose p {
  color: var(--text-dim);
  line-height: 1.85;
  font-size: 1.02rem;
  margin-bottom: 20px;
}
.prose img, .prose video {
  width: 100%;
  border-radius: 18px;
  border: 1px solid var(--border);
  margin: 8px 0 26px;
  display: block;
}
.prose .img-pair { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
@media (max-width: 640px) { .prose .img-pair { grid-template-columns: 1fr; } }
.prose .img-pair img { margin: 0; }

.tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 10px 0 36px;
}
.tag-pill {
  font-size: .8rem;
  font-weight: 600;
  padding: 9px 18px;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-dim);
}

.conclusion-box {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: linear-gradient(135deg, rgba(124,92,255,.1), rgba(76,224,210,.06));
  padding: 34px;
  position: relative;
}
.conclusion-box::before {
  content: '';
  position: absolute;
  left: 0; top: 20px; bottom: 20px;
  width: 3px;
  border-radius: 4px;
  background: var(--grad-1);
}
.conclusion-box h3 {
  font-size: .8rem;
  text-transform: uppercase;
  letter-spacing: .14em;
  color: var(--accent-3);
  font-weight: 700;
  margin-bottom: 14px;
}
.conclusion-box p { color: var(--text-dim); line-height: 1.8; margin: 0; font-size: .98rem; }

.live-link {
  margin: 6px 0 36px;
}

.side-gallery {
  position: sticky;
  top: 96px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.gallery-card {
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 18px;
  overflow: hidden;
}
.gallery-card h4 {
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--text-dim);
  font-weight: 600;
  margin-bottom: 14px;
}
.gallery-card img {
  width: 100%;
  border-radius: 12px;
  display: block;
}