/* ============================================================
   唐舒颜 Portfolio v3 — Premium Dark Theme
   ============================================================ */

/* ── Variables ── */
:root {
  --bg: #060606;
  --bg-elevated: #0e0e0e;
  --bg-card: #141414;
  --text: #eae5df;
  --text-dim: #7a756e;
  --text-faint: #3d3a36;
  --gold: #c9a96e;
  --gold-light: #dfc18e;
  --gold-dark: #9e7d42;
  --gold-glow: rgba(201,169,110,0.08);
  --border: rgba(255,255,255,0.06);
  --border-hover: rgba(201,169,110,0.25);
  --font-display: 'Noto Serif SC', 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --ease: cubic-bezier(.25,.46,.45,.94);
  --ease-out: cubic-bezier(.0,.0,.2,1);
  --ease-spring: cubic-bezier(.34,1.56,.64,1);
  --nav-h: 64px;
  --gap: 12px;
}

/* ── Reset ── */
*, *::before, *::after { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  overflow-x: hidden;
}
img { display:block; max-width:100%; height:auto; }
a { color:inherit; text-decoration:none; }
button { background:none; border:none; cursor:pointer; font-family:inherit; color:inherit; }
::selection { background: var(--gold); color: var(--bg); }

::-webkit-scrollbar { width:5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-faint); border-radius:3px; }

/* ── Preloader ── */
.preloader {
  position:fixed; inset:0; z-index:9999;
  background: var(--bg);
  display:flex; align-items:center; justify-content:center;
  transition: opacity .8s var(--ease), visibility .8s;
}
.preloader.hidden { opacity:0; visibility:hidden; pointer-events:none; }
.preloader-inner { text-align:center; }
.preloader-line {
  width:40px; height:1px; background:var(--gold);
  margin:0 auto 20px;
  animation: preloaderPulse 1.2s var(--ease) infinite;
}
@keyframes preloaderPulse {
  0%,100% { width:40px; opacity:1; }
  50% { width:80px; opacity:.4; }
}
.preloader-text {
  font-family: var(--font-display);
  font-size:11px; letter-spacing:8px; color:var(--text-dim);
  text-transform:uppercase;
}

/* ── Cursor ── */
.custom-cursor { display:none; position:fixed; top:0; left:0; z-index:9998; pointer-events:none; mix-blend-mode:difference; }
.cursor-dot { width:5px; height:5px; background:#fff; border-radius:50%; position:absolute; top:-2.5px; left:-2.5px; }
.cursor-ring {
  width:32px; height:32px; border:1px solid rgba(255,255,255,.4);
  border-radius:50%; position:absolute; top:-16px; left:-16px;
  transition: width .35s, height .35s, top .35s, left .35s, opacity .35s;
}
.custom-cursor.hover .cursor-ring { width:50px; height:50px; top:-25px; left:-25px; opacity:.2; }
@media(pointer:fine) { .custom-cursor { display:block; } }

/* ── Navbar ── */
.navbar {
  position:fixed; top:0; left:0; right:0; z-index:100;
  height:var(--nav-h);
  display:flex; align-items:center;
  transition: background .5s, backdrop-filter .5s, box-shadow .5s;
}
.navbar.scrolled {
  background: rgba(6,6,6,.85);
  backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
  box-shadow: 0 1px 0 var(--border);
}
.nav-container {
  max-width:100%; width:100%; margin:0 auto;
  padding: 0 clamp(20px,4vw,48px);
  display:flex; align-items:center; justify-content:space-between;
}
.nav-logo {
  font-family: var(--font-display);
  font-size:16px; font-weight:400; letter-spacing:3px;
}
.nav-links { display:flex; gap:28px; }
.nav-link {
  font-size:12px; font-weight:400; letter-spacing:1.5px;
  text-transform:uppercase; color:var(--text-dim);
  transition: color .3s;
  position:relative;
}
.nav-link::after {
  content:''; position:absolute; bottom:-3px; left:0;
  width:0; height:1px; background:var(--gold);
  transition: width .4s var(--ease);
}
.nav-link:hover, .nav-link.active { color:var(--text); }
.nav-link:hover::after, .nav-link.active::after { width:100%; }

.menu-toggle { display:none; flex-direction:column; gap:5px; width:24px; z-index:101; }
.menu-bar { display:block; width:100%; height:1px; background:var(--text); transition: .4s; }
.menu-toggle.active .menu-bar:nth-child(1) { transform: translateY(3px) rotate(45deg); }
.menu-toggle.active .menu-bar:nth-child(2) { opacity:0; }
.menu-toggle.active .menu-bar:nth-child(3) { transform: translateY(-3px) rotate(-45deg); }

@media(max-width:768px) {
  .menu-toggle { display:flex; }
  .nav-links { display:none; }
}

.mobile-menu {
  position:fixed; inset:0; z-index:99;
  background: var(--bg);
  display:flex; align-items:center; justify-content:center;
  opacity:0; visibility:hidden;
  transition: opacity .5s, visibility .5s;
}
.mobile-menu.active { opacity:1; visibility:visible; }
.mobile-menu-content { display:flex; flex-direction:column; align-items:center; gap:36px; }
.mobile-link {
  font-family:var(--font-display); font-size:28px; font-weight:300;
  color:var(--text-dim);
  transform:translateY(20px); opacity:0;
  transition: .5s var(--ease), color .3s;
}
.mobile-menu.active .mobile-link { transform:translateY(0); opacity:1; }
.mobile-menu.active .mobile-link:nth-child(1) { transition-delay:.1s; }
.mobile-menu.active .mobile-link:nth-child(2) { transition-delay:.2s; }
.mobile-link:hover { color:var(--gold); }

/* ── Hero ── */
.hero {
  position:relative; width:100%; height:100vh; min-height:560px;
  display:flex; align-items:center; justify-content:center;
  overflow:hidden;
}
.hero-slideshow { position:absolute; inset:0; }
.hero-slide {
  position:absolute; inset:0; opacity:0;
  transition: opacity 1.8s var(--ease);
}
.hero-slide.active { opacity:1; }
.hero-slide img {
  width:100%; height:100%; object-fit:cover;
  transform: scale(1.08);
  transition: transform 10s var(--ease);
}
.hero-slide.active img { transform: scale(1); }
.hero-overlay {
  position:absolute; inset:0;
  background:
    linear-gradient(180deg, rgba(6,6,6,.7) 0%, rgba(6,6,6,.2) 40%, rgba(6,6,6,.35) 70%, rgba(6,6,6,.95) 100%);
}
.hero-content {
  position:relative; z-index:2; text-align:center;
  padding: 0 20px;
}
.hero-tag {
  display:inline-block; font-size:10px; font-weight:500;
  letter-spacing:6px; text-transform:uppercase; color:var(--gold);
  border:1px solid var(--border-hover);
  padding:5px 18px; margin-bottom:28px;
  opacity:0; transform:translateY(16px);
  animation: fadeUp .8s var(--ease-out) .4s forwards;
}
.hero-title {
  font-family: var(--font-display);
  font-size: clamp(56px,12vw,140px);
  font-weight:300; letter-spacing:.08em; line-height:1;
  margin-bottom:12px;
}
.title-char {
  display:inline-block; opacity:0;
  transform: translateY(50px);
  animation: charIn .9s var(--ease-spring) forwards;
}
.title-char:nth-child(1) { animation-delay:.6s; }
.title-char:nth-child(2) { animation-delay:.78s; }
.title-char:nth-child(3) { animation-delay:.96s; }
@keyframes charIn { to { opacity:1; transform:translateY(0); } }

.hero-subtitle {
  font-size: clamp(12px,1.8vw,16px);
  font-weight:300; letter-spacing:8px; text-transform:uppercase;
  color:var(--text-dim); margin-bottom:0;
  opacity:0; transform:translateY(12px);
  animation: fadeUp .8s var(--ease-out) 1.1s forwards;
}
@keyframes fadeUp { to { opacity:1; transform:translateY(0); } }

.hero-scroll-hint {
  position:absolute; bottom:36px; left:50%; transform:translateX(-50%);
  z-index:2; display:flex; flex-direction:column; align-items:center; gap:10px;
  opacity:0; animation: fadeUp .8s var(--ease-out) 1.6s forwards;
}
.hero-scroll-hint span {
  font-size:9px; letter-spacing:4px; text-transform:uppercase; color:var(--text-faint);
}
.scroll-line {
  width:1px; height:40px;
  background: linear-gradient(to bottom, var(--gold-dark), transparent);
  animation: scrollAnim 2s var(--ease) infinite;
  transform-origin: top;
}
@keyframes scrollAnim {
  0%,100% { transform:scaleY(.5); opacity:.3; }
  50% { transform:scaleY(1); opacity:1; }
}

/* ── Gallery ── */
.gallery {
  padding: clamp(60px,10vw,120px) 0 80px;
  min-height:100vh;
}
.gallery-header {
  max-width:1400px; margin:0 auto;
  padding: 0 clamp(20px,4vw,48px);
  display:flex; align-items:flex-end; gap:20px;
  margin-bottom: clamp(32px,6vw,64px);
}
.gallery-header-num {
  font-family:var(--font-display); font-size:13px; color:var(--gold-dark);
  letter-spacing:2px; flex-shrink:0; padding-bottom:2px;
}
.gallery-title {
  font-family:var(--font-display);
  font-size: clamp(24px,4vw,42px); font-weight:300;
  letter-spacing:3px; line-height:1.2;
}
.gallery-subtitle {
  font-size:12px; color:var(--text-faint); letter-spacing:3px;
  text-transform:uppercase; margin-top:4px;
}
.gallery-header-count {
  margin-left:auto; font-size:13px; color:var(--text-faint);
  letter-spacing:1px; flex-shrink:0;
}

/* ── Featured Strip (Horizontal Scroll) ── */
.featured-strip {
  display:flex; gap:var(--gap);
  overflow-x:auto; overflow-y:hidden;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding: 0 clamp(20px,4vw,48px) 40px;
  scrollbar-width:none;
  cursor:grab;
}
.featured-strip::-webkit-scrollbar { display:none; }
.featured-strip.dragging { cursor:grabbing; scroll-snap-type:none; }

.featured-item {
  flex: 0 0 clamp(260px, 65vw, 520px);
  scroll-snap-align: start;
  position:relative; overflow:hidden;
  border-radius: 6px;
  background: var(--bg-elevated);
}
.featured-item img {
  width:100%; aspect-ratio:3/4; object-fit:cover;
  transition: transform .8s var(--ease);
}
.featured-item:hover img { transform: scale(1.04); }
.featured-item::after {
  content:''; position:absolute; inset:0;
  border:1px solid var(--border);
  border-radius:6px; pointer-events:none;
  transition: border-color .4s;
}
.featured-item:hover::after { border-color: var(--border-hover); }

/* ── Grid Gallery ── */
.gallery-grid {
  max-width:1400px; margin:0 auto;
  padding: 0 clamp(20px,4vw,48px);
  columns: 4; column-gap:var(--gap);
}
@media(max-width:1100px) { .gallery-grid { columns:3; } }
@media(max-width:700px)  { .gallery-grid { columns:2; column-gap:10px; } }
@media(max-width:400px)  { .gallery-grid { columns:1; } }

.grid-item {
  break-inside:avoid;
  margin-bottom: var(--gap);
  position:relative; overflow:hidden;
  border-radius: 4px;
  cursor:pointer;
  opacity:0; transform:translateY(30px);
  transition: opacity .7s var(--ease), transform .7s var(--ease);
}
.grid-item.visible { opacity:1; transform:translateY(0); }
.grid-item img {
  width:100%; display:block;
  transition: transform .6s var(--ease), filter .6s;
}
.grid-item:hover img {
  transform: scale(1.025);
  filter: brightness(1.08);
}
.grid-item::after {
  content:''; position:absolute; inset:0;
  border:1px solid transparent; border-radius:4px;
  pointer-events:none; transition: border-color .3s;
}
.grid-item:hover::after { border-color: var(--border-hover); }

/* ── Load More ── */
.gallery-loading { text-align:center; padding:40px 0 20px; }
.load-more-btn {
  display:inline-flex; align-items:center; gap:8px;
  font-size:12px; letter-spacing:2px; text-transform:uppercase;
  color:var(--text-dim); padding:12px 28px;
  border:1px solid var(--border);
  transition: all .4s;
}
.load-more-btn:hover {
  color:var(--gold); border-color:var(--border-hover);
}

/* ── Contact ── */
.contact {
  padding: clamp(60px,10vw,120px) 0;
  border-top:1px solid var(--border);
}
.contact-container {
  max-width:1400px; margin:0 auto;
  padding: 0 clamp(20px,4vw,48px);
}
.contact-header {
  display:flex; align-items:flex-end; gap:20px;
  margin-bottom: clamp(32px,6vw,56px);
}
.contact-header-num {
  font-family:var(--font-display); font-size:13px; color:var(--gold-dark);
  letter-spacing:2px; flex-shrink:0; padding-bottom:2px;
}
.contact-title {
  font-family:var(--font-display);
  font-size: clamp(24px,4vw,42px); font-weight:300;
  letter-spacing:3px;
}
.contact-subtitle {
  font-size:12px; color:var(--text-faint); letter-spacing:3px;
  text-transform:uppercase; margin-top:4px;
}
.contact-cards {
  display:grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 16px;
}
@media(max-width:640px) {
  .contact-cards { grid-template-columns: 1fr; }
}
.contact-card {
  display:flex; align-items:center; gap:16px;
  padding:24px;
  background: var(--bg-elevated);
  border:1px solid var(--border);
  border-radius: 6px;
  transition: border-color .4s, transform .4s var(--ease);
}
.contact-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}
.contact-card-icon {
  flex-shrink:0; width:44px; height:44px;
  display:flex; align-items:center; justify-content:center;
  border-radius:50%; background: var(--gold-glow);
  color: var(--gold);
}
.contact-card-icon svg { width:20px; height:20px; }
.contact-card-content { display:flex; flex-direction:column; gap:4px; }
.contact-card-label {
  font-size:11px; letter-spacing:1.5px; text-transform:uppercase;
  color:var(--text-faint);
}
.contact-card-value {
  font-size:14px; font-weight:400; color:var(--text);
  line-height:1.5;
}

/* ── Footer ── */
.footer {
  padding:28px 0; border-top:1px solid var(--border);
  text-align:center;
}
.footer p { font-size:11px; color:var(--text-faint); letter-spacing:1px; }

/* ── Lightbox ── */
.lightbox {
  position:fixed; inset:0; z-index:9000;
  background: rgba(3,3,3,.97);
  display:flex; align-items:center; justify-content:center;
  opacity:0; visibility:hidden;
  transition: opacity .4s, visibility .4s;
}
.lightbox.active { opacity:1; visibility:visible; }
.lb-close {
  position:absolute; top:16px; right:16px; z-index:10;
  width:44px; height:44px; display:flex; align-items:center; justify-content:center;
  color:var(--text-dim); transition: color .3s;
}
.lb-close:hover { color:var(--text); }
.lb-nav {
  position:absolute; top:50%; transform:translateY(-50%); z-index:10;
  width:44px; height:44px; display:flex; align-items:center; justify-content:center;
  border:1px solid var(--border); border-radius:50%;
  color:var(--text-dim); transition: all .3s;
}
.lb-nav:hover { color:var(--text); border-color:var(--border-hover); }
.lb-prev { left:16px; }
.lb-next { right:16px; }
@media(max-width:768px) {
  .lb-prev { left:8px; }
  .lb-next { right:8px; }
}
.lb-content {
  width:100%; height:100%;
  display:flex; align-items:center; justify-content:center;
  padding: 56px 60px 80px;
}
@media(max-width:768px) { .lb-content { padding:56px 12px 80px; } }
.lb-img {
  max-width:100%; max-height:100%;
  object-fit:contain; border-radius:2px;
  opacity:0; transform:scale(.96);
  transition: opacity .45s var(--ease), transform .45s var(--ease);
}
.lb-img.loaded { opacity:1; transform:scale(1); }
.lb-counter {
  position:absolute; bottom:72px; left:50%; transform:translateX(-50%);
  font-size:12px; letter-spacing:2px; color:var(--text-faint);
}
.lb-thumbs {
  position:absolute; bottom:0; left:0; right:0;
  display:flex; gap:3px; padding:10px;
  overflow-x:auto;
  background: rgba(6,6,6,.85);
  backdrop-filter: blur(8px);
  scrollbar-width:none;
}
.lb-thumbs::-webkit-scrollbar { display:none; }
.lb-thumb {
  flex-shrink:0; width:44px; height:44px;
  border-radius:2px; overflow:hidden;
  cursor:pointer; opacity:.35;
  border:1px solid transparent;
  transition: all .25s;
}
.lb-thumb.active { opacity:1; border-color:var(--gold); }
.lb-thumb img { width:100%; height:100%; object-fit:cover; }

/* ── Back to Top ── */
.back-top {
  position:fixed; bottom:20px; right:20px; z-index:800;
  width:40px; height:40px; display:flex; align-items:center; justify-content:center;
  background: var(--bg-elevated);
  border:1px solid var(--border); border-radius:50%;
  color:var(--text-dim);
  opacity:0; visibility:hidden; transform:translateY(8px);
  transition: all .4s;
}
.back-top.visible { opacity:1; visibility:visible; transform:translateY(0); }
.back-top:hover { color:var(--gold); border-color:var(--border-hover); transform:translateY(-2px); }

/* ── Reduced Motion ── */
@media(prefers-reduced-motion:reduce) {
  *, *::before, *::after {
    animation-duration:.01ms!important;
    transition-duration:.01ms!important;
    scroll-behavior:auto!important;
  }
  .grid-item { opacity:1; transform:none; }
}