/* ============================================================
   仪龙文化 品牌官网 — style.css
   纯原生 CSS，零依赖
   ============================================================ */

/* ===== 1. Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
  background: #0b0b0b;
  color: #e8e4dd;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
body.no-scroll { overflow: hidden; }

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

/* ===== 2. Utility ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ===== 3. Loader ===== */
#loader {
  position: fixed; inset: 0; z-index: 9999;
  background: #0b0b0b;
  display: flex; align-items: center; justify-content: center;
  flex-direction: column;
  transition: opacity 0.6s ease, visibility 0.6s ease;
}
#loader.hidden { opacity: 0; visibility: hidden; pointer-events: none; }

.loader-ring {
  width: 56px; height: 56px;
  border: 2px solid rgba(196,168,110,0.12);
  border-top-color: #c4a86e;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

#loader p {
  margin-top: 20px;
  font-size: 14px;
  letter-spacing: 4px;
  color: #c4a86e;
}

/* ===== 4. Navigation ===== */
nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 16px 0;
  transition: background 0.4s, padding 0.4s, border-color 0.4s;
}
nav.scrolled {
  background: rgba(11,11,11,0.92);
  -webkit-backdrop-filter: blur(20px);
  backdrop-filter: blur(20px);
  padding: 10px 0;
  border-bottom: 1px solid rgba(196,168,110,0.1);
}
nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 3px;
}
.logo-link {
  background: linear-gradient(135deg, #c4a86e, #e8d5a3);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.logo-sub {
  font-weight: 300;
  font-size: 11px;
  letter-spacing: 2px;
  color: #666;
  -webkit-text-fill-color: #666;
  display: block;
}

.nav-links { display: flex; gap: 28px; }
.nav-links a {
  font-size: 14px;
  letter-spacing: 1px;
  color: #888;
  transition: color 0.3s;
  position: relative;
  padding: 4px 0;
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: #c4a86e;
  transition: width 0.3s;
}
.nav-links a:hover,
.nav-links a.active { color: #e8d5a3; }
.nav-links a:hover::after,
.nav-links a.active::after { width: 100%; }

.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
  z-index: 1001;
}
.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: #e8e4dd;
  border-radius: 1px;
  transition: transform 0.3s, opacity 0.3s;
}
.hamburger.open span:nth-child(1) { transform: rotate(45deg) translate(5px,5px); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: rotate(-45deg) translate(5px,-5px); }

.nav-overlay {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 998;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.4s;
}
.nav-overlay.show { opacity: 1; pointer-events: auto; }

/* ===== 5. Section Common ===== */
section { padding: 100px 0; }

.section-label {
  font-size: 12px;
  letter-spacing: 4px;
  color: #c4a86e;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(26px, 3.5vw, 40px);
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 14px;
  line-height: 1.25;
}

.section-desc {
  color: #777;
  max-width: 600px;
  font-size: 15px;
  margin-bottom: 50px;
}

/* ===== 6. Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  background:
    radial-gradient(ellipse at 30% 20%, rgba(196,168,110,0.07) 0%, transparent 60%),
    radial-gradient(ellipse at 70% 80%, rgba(196,168,110,0.05) 0%, transparent 50%),
    #0b0b0b;
  overflow: hidden;
}

.hero-particles {
  position: absolute; inset: 0;
  overflow: hidden;
  pointer-events: none;
}
.particle {
  position: absolute;
  width: 2px; height: 2px;
  background: #c4a86e;
  border-radius: 50%;
  animation: float-up linear infinite;
}
@keyframes float-up {
  0%   { transform: translateY(100vh) scale(0); opacity: 0; }
  10%  { opacity: 0.25; }
  90%  { opacity: 0.25; }
  100% { transform: translateY(-10vh) scale(1); opacity: 0; }
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 120px 0 80px;
}

.hero-badge {
  display: inline-block;
  border: 1px solid rgba(196,168,110,0.3);
  border-radius: 50px;
  padding: 5px 18px;
  font-size: 12px;
  letter-spacing: 3px;
  color: #c4a86e;
  margin-bottom: 28px;
}

.hero h1 {
  font-size: clamp(38px, 6.5vw, 76px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: 3px;
  margin-bottom: 18px;
}
.hero h1 .gold {
  background: linear-gradient(135deg, #c4a86e, #f0e2b5);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-sub {
  font-size: clamp(15px, 1.8vw, 20px);
  color: #999;
  max-width: 520px;
  margin-bottom: 44px;
  letter-spacing: 1.5px;
  line-height: 1.6;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  padding: 13px 36px;
  border-radius: 50px;
  font-size: 14px;
  letter-spacing: 2px;
  font-weight: 600;
  transition: all 0.35s;
  border: none;
  cursor: pointer;
}
.btn-primary {
  background: linear-gradient(135deg, #c4a86e, #d4bc88);
  color: #0b0b0b;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 28px rgba(196,168,110,0.25);
}
.btn-outline {
  background: transparent;
  color: #c4a86e;
  border: 1px solid rgba(196,168,110,0.35);
}
.btn-outline:hover {
  background: rgba(196,168,110,0.08);
  border-color: #c4a86e;
}

.hero-stats {
  display: flex;
  gap: 48px;
  margin-top: 56px;
  padding-top: 36px;
  border-top: 1px solid rgba(196,168,110,0.1);
}
.stat-num {
  font-size: 34px;
  font-weight: 700;
  color: #c4a86e;
  line-height: 1;
}
.stat-label {
  font-size: 13px;
  color: #666;
  margin-top: 5px;
  letter-spacing: 1px;
}

/* ===== 7. About ===== */
#about { background: #0f0f0f; }

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

.about-text p {
  color: #999;
  margin-bottom: 14px;
  font-size: 15px;
  line-height: 1.8;
}
.about-text strong { color: #c4a86e; }

.timeline {
  position: relative;
  padding-left: 28px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 5px; top: 4px; bottom: 4px;
  width: 1px;
  background: linear-gradient(to bottom, #c4a86e, rgba(196,168,110,0.1));
}

.tl-item {
  position: relative;
  padding-bottom: 32px;
}
.tl-item:last-child { padding-bottom: 0; }
.tl-item::before {
  content: '';
  position: absolute;
  left: -23px; top: 6px;
  width: 10px; height: 10px;
  background: #c4a86e;
  border-radius: 50%;
  border: 2px solid #0f0f0f;
}
.tl-year {
  font-size: 13px;
  color: #c4a86e;
  letter-spacing: 2px;
  font-weight: 600;
}
.tl-title { font-size: 16px; font-weight: 600; margin: 3px 0 5px; }
.tl-desc { font-size: 14px; color: #777; line-height: 1.6; }

/* ===== 8. Services ===== */
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.svc-card {
  background: linear-gradient(145deg, #131313, #0d0d0d);
  border: 1px solid rgba(196,168,110,0.07);
  border-radius: 14px;
  padding: 36px 28px;
  transition: all 0.35s;
  position: relative;
  overflow: hidden;
}
.svc-card::before {
  content: '';
  position: absolute; top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, #c4a86e, transparent);
  transform: scaleX(0);
  transition: transform 0.4s;
}
.svc-card:hover {
  border-color: rgba(196,168,110,0.18);
  transform: translateY(-3px);
}
.svc-card:hover::before { transform: scaleX(1); }

.svc-icon {
  width: 44px; height: 44px;
  background: rgba(196,168,110,0.08);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 20px;
  margin-bottom: 18px;
}
.svc-card h3 {
  font-size: 17px;
  margin-bottom: 10px;
  letter-spacing: 0.5px;
}
.svc-card p {
  font-size: 14px;
  color: #777;
  line-height: 1.7;
}
.svc-tags {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.svc-tags span {
  font-size: 12px;
  padding: 3px 11px;
  background: rgba(196,168,110,0.05);
  border: 1px solid rgba(196,168,110,0.08);
  border-radius: 20px;
  color: #999;
}

/* ===== 9. Cases (Portfolio) ===== */
#cases { background: #0f0f0f; }

/* 年份筛选行 */
.cases-filter-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 12px;
}
/* 分类筛选行 */
.cases-filter-row + .cases-filter-row {
  margin-top: 4px;
  padding-top: 12px;
  border-top: 1px solid rgba(196,168,110,0.06);
}

.cf-btn {
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 13px;
  letter-spacing: 1px;
  background: transparent;
  border: 1px solid rgba(196,168,110,0.12);
  color: #888;
  cursor: pointer;
  transition: all 0.3s;
  font-family: inherit;
}
.cf-btn:hover { border-color: rgba(196,168,110,0.3); color: #c4a86e; }
.cf-btn.active {
  background: #c4a86e;
  color: #0b0b0b;
  border-color: #c4a86e;
}
/* 年份按钮突出一点 */
.cf-btn.year-btn { font-weight: 600; }

.cases-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  margin-top: 28px;
}

.case-card {
  background: #121212;
  border: 1px solid rgba(196,168,110,0.06);
  border-radius: 14px;
  overflow: hidden;
  transition: all 0.35s;
  cursor: pointer;
}
.case-card:hover {
  border-color: rgba(196,168,110,0.18);
  transform: translateY(-3px);
}

/* 案例封面图区域 */
.case-img {
  width: 100%;
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: #181818;
  position: relative;
}
.case-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}
.case-card:hover .case-img img { transform: scale(1.04); }

.case-card .click-hint {
  position: absolute;
  bottom: 10px; right: 10px;
  background: rgba(0,0,0,0.6);
  color: #c4a86e;
  font-size: 11px;
  padding: 3px 10px;
  border-radius: 20px;
  letter-spacing: 1px;
}

/* 无图时的占位块 */
.case-img-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #181818, #1a1a1a, #181818);
  font-size: 13px;
  color: #555;
  letter-spacing: 2px;
}

/* 案例文字信息 */
.case-info { padding: 16px 18px 18px; }

.case-tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 1px;
  color: #c4a86e;
  border: 1px solid rgba(196,168,110,0.18);
  padding: 2px 10px;
  border-radius: 20px;
  margin-bottom: 8px;
}

.case-title {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.5;
}

.case-meta {
  font-size: 13px;
  color: #666;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.case-meta span { display: flex; align-items: center; gap: 4px; }
.case-meta .people { color: #c4a86e; }

/* ===== 10. Case Detail Modal ===== */
.modal-overlay {
  position: fixed; inset: 0;
  z-index: 2000;
  background: rgba(0,0,0,0.7);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.35s, visibility 0.35s;
  padding: 20px;
}
.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  background: #121212;
  border: 1px solid rgba(196,168,110,0.1);
  border-radius: 18px;
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  overflow-y: auto;
  position: relative;
  transform: translateY(30px) scale(0.96);
  transition: transform 0.4s;
}
.modal-overlay.open .modal {
  transform: translateY(0) scale(1);
}

.modal-close {
  position: absolute;
  top: 16px; right: 16px;
  z-index: 10;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: rgba(0,0,0,0.5);
  border: 1px solid rgba(196,168,110,0.15);
  color: #e8e4dd;
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s;
}
.modal-close:hover {
  background: #c4a86e;
  color: #0b0b0b;
}

.modal-header {
  padding: 36px 36px 0;
}
.modal-header .case-tag {
  margin-right: 8px;
}
.modal-header .modal-year {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 1px;
  color: #666;
  border: 1px solid rgba(255,255,255,0.08);
  padding: 2px 10px;
  border-radius: 20px;
}
.modal-title {
  font-size: 22px;
  font-weight: 700;
  margin: 12px 0 10px;
  line-height: 1.35;
}
.modal-meta {
  font-size: 14px;
  color: #666;
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}
.modal-desc {
  color: #888;
  font-size: 14px;
  line-height: 1.7;
  margin-top: 10px;
  padding-bottom: 20px;
  border-bottom: 1px solid rgba(196,168,110,0.06);
}

/* 模态框图片网格 — 6张图 3×2 */
.modal-images {
  padding: 24px 36px 36px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.modal-img {
  aspect-ratio: 4 / 3;
  border-radius: 10px;
  overflow: hidden;
  background: #181818;
  position: relative;
}
.modal-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.modal-img .placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #181818, #1e1e1e);
  font-size: 12px;
  color: #444;
  letter-spacing: 1px;
}
.modal-img .img-label {
  position: absolute;
  bottom: 6px; left: 6px;
  background: rgba(0,0,0,0.6);
  color: #888;
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
}

/* ===== 11. Clients ===== */
.clients-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
  gap: 12px;
  margin-top: 36px;
}

.client-logo {
  height: 60px;
  background: rgba(255,255,255,0.02);
  border: 1px solid rgba(196,168,110,0.06);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  color: #555;
  letter-spacing: 1px;
  transition: all 0.3s;
  text-align: center;
  padding: 0 8px;
}
.client-logo:hover {
  border-color: rgba(196,168,110,0.18);
  color: #c4a86e;
  background: rgba(196,168,110,0.04);
}

/* ===== 12. Contact ===== */
#contact { background: #0f0f0f; }

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}

.contact-info h3 {
  font-size: 22px;
  margin-bottom: 14px;
}
.contact-info .tagline {
  color: #888;
  font-size: 15px;
  margin-bottom: 24px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #888;
  margin-bottom: 8px;
  font-size: 15px;
}
.contact-item .icon {
  color: #c4a86e;
  width: 20px;
  text-align: center;
  flex-shrink: 0;
}

.contact-cta .cta-text {
  font-size: 18px;
  font-weight: 600;
  margin-bottom: 10px;
}
.contact-cta p { color: #888; font-size: 14px; }
.contact-cta .btn-wrap { margin-top: 28px; }

/* ===== 13. Footer ===== */
footer {
  padding: 28px 0;
  border-top: 1px solid rgba(196,168,110,0.06);
  text-align: center;
  font-size: 13px;
  color: #444;
}

/* ===== 14. Scroll Animation ===== */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}
.fade-in.fast { transition-duration: 0.4s; }

/* ===== 15. Modal Responsive ===== */
@media (max-width: 768px) {
  .modal-header { padding: 28px 24px 0; }
  .modal-images {
    padding: 20px 24px 28px;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
  }
  .modal-title { font-size: 18px; }
}

@media (max-width: 480px) {
  .modal-images { grid-template-columns: 1fr; }
  .modal-header { padding: 24px 18px 0; }
  .modal-images { padding: 16px 18px 24px; }
}

/* ===== 16. Main Responsive ===== */
@media (max-width: 900px) {
  section { padding: 80px 0; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .cases-grid { grid-template-columns: repeat(2, 1fr); }
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}

@media (max-width: 640px) {
  section { padding: 56px 0; }
  .container { padding: 0 18px; }

  .nav-links {
    position: fixed;
    top: 0; right: -280px;
    width: 250px; height: 100vh;
    background: rgba(11,11,11,0.97);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 72px 28px 32px;
    gap: 20px;
    transition: right 0.35s ease;
    z-index: 999;
  }
  .nav-links.open { right: 0; }
  .hamburger { display: flex; }

  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .stat-num { font-size: 28px; }

  .services-grid { grid-template-columns: 1fr; }
  .cases-grid { grid-template-columns: 1fr; }

  .cases-filter-row { gap: 6px; }
  .cf-btn { font-size: 12px; padding: 5px 14px; }

  .clients-grid { grid-template-columns: repeat(3, 1fr); }
  .client-logo { height: 52px; font-size: 12px; }

  .contact-cta .cta-text { font-size: 16px; }
}