/* ============================================================
 * 邦大 v2 升级版样式 - 增强奢华感
 * 灵感来源：英良博物馆 + 高时BC矩阵 + 天一多馆
 * ============================================================ */

/* ========== Hero 视频首屏 ========== */
.hero-video {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #08080C;
  padding-bottom: 100px;
}
.hero-video-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.55;
  z-index: 0;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg,
    rgba(8,8,12,0.55) 0%,
    rgba(8,8,12,0.35) 40%,
    rgba(8,8,12,0.7) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  color: #fff;
  padding-top: 80px;
}
.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.32em;
  color: var(--c-brass);
  margin-bottom: 32px;
  text-transform: uppercase;
}
.hero-eyebrow .line {
  width: 40px;
  height: 1px;
  background: var(--c-brass);
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(38px, 6.5vw, 88px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: #fff;
  margin-bottom: 32px;
  text-shadow: 0 4px 32px rgba(0,0,0,0.5);
}
.hero-title .text-brass {
  background: linear-gradient(135deg, #B89968 0%, #E7D9B6 50%, #B89968 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.hero-sub {
  font-size: clamp(16px, 2vw, 22px);
  color: rgba(255,255,255,0.85);
  margin-bottom: 8px;
  letter-spacing: 0.05em;
}
.hero-sub-2 {
  font-size: clamp(13px, 1.5vw, 16px);
  color: rgba(255,255,255,0.6);
  margin-bottom: 48px;
  letter-spacing: 0.08em;
}
.hero-cta {
  display: flex;
  gap: 20px;
  justify-content: center;
  flex-wrap: wrap;
}
.btn--ghost {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.35);
}
.btn--ghost:hover {
  background: rgba(255,255,255,0.08);
  border-color: var(--c-brass);
  color: var(--c-brass);
}
.hero-scroll {
  position: absolute;
  bottom: 240px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: rgba(255,255,255,0.5);
}
.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(180deg, rgba(184,153,104,0.8) 0%, transparent 100%);
  margin: 12px auto 0;
  animation: scroll-down 2s ease-in-out infinite;
}
@keyframes scroll-down {
  0%, 100% { transform: scaleY(1); opacity: 0.8; }
  50% { transform: scaleY(1.5); opacity: 0.4; }
}

/* ========== Hero Metrics（深色版） ========== */
.hero-metrics {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 2;
  background: linear-gradient(180deg, transparent 0%, rgba(8,8,12,0.92) 100%);
  padding: 40px 0 32px;
}
.hero-metrics .metric-item {
  text-align: center;
  color: #fff;
}
.hero-metrics .metric-num {
  font-family: var(--font-serif);
  font-size: clamp(28px, 3vw, 42px);
  font-weight: 600;
  color: var(--c-brass);
  margin-bottom: 8px;
}
.hero-metrics .metric-label {
  font-size: 13px;
  color: rgba(255,255,255,0.7);
  letter-spacing: 0.1em;
}

/* ========== Manifesto（集团定位） ========== */
.manifesto {
  text-align: center;
}
.manifesto-content {
  max-width: 920px;
  margin: 0 auto;
}
.eyebrow--brass {
  color: var(--c-brass) !important;
}
.manifesto-title {
  font-family: var(--font-serif);
  font-size: clamp(36px, 5vw, 64px);
  color: #fff;
  font-weight: 600;
  margin: 24px 0 32px;
  line-height: 1.15;
}
.manifesto-lead {
  font-size: clamp(17px, 1.8vw, 21px);
  color: rgba(255,255,255,0.85);
  line-height: 1.8;
  margin-bottom: 24px;
}
.manifesto-desc {
  font-size: clamp(15px, 1.4vw, 17px);
  color: rgba(255,255,255,0.65);
  line-height: 1.9;
  margin-bottom: 40px;
}
.manifesto .text-white {
  color: #fff;
}

/* ========== BC 矩阵：6 大业务板块 ========== */
.bc-matrix {
  background: linear-gradient(180deg, var(--c-paper) 0%, var(--c-bone) 100%);
}
.bc-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 56px;
}
.bc-card {
  position: relative;
  background: #fff;
  border: 1px solid var(--c-brass-soft);
  padding: 40px 32px;
  transition: all var(--t-med) var(--ease-out);
  overflow: hidden;
  display: block;
  color: inherit;
}
.bc-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--c-brass) 0%, var(--c-brass-soft) 100%);
  transition: width var(--t-med) var(--ease-out);
}
.bc-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--c-brass);
}
.bc-card:hover::before {
  width: 100%;
}
.bc-num {
  position: absolute;
  top: 16px;
  right: 24px;
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 700;
  color: var(--c-brass);
  letter-spacing: 0.1em;
  opacity: 0.6;
}
.bc-num-text {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--c-mist);
  letter-spacing: 0.2em;
  margin-bottom: 24px;
}
.bc-icon {
  width: 56px;
  height: 56px;
  color: var(--c-brass);
  margin-bottom: 24px;
}
.bc-icon svg {
  width: 100%;
  height: 100%;
}
.bc-card h3 {
  font-family: var(--font-serif);
  font-size: 26px;
  color: var(--c-ink);
  margin-bottom: 4px;
}
.bc-en {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-brass);
  margin-bottom: 16px;
  text-transform: uppercase;
}
.bc-desc {
  font-size: 14px;
  color: var(--c-stone);
  line-height: 1.7;
  margin-bottom: 24px;
}
.bc-arrow {
  display: inline-block;
  font-size: 22px;
  color: var(--c-brass);
  transition: transform var(--t-fast) var(--ease-out);
}
.bc-card:hover .bc-arrow {
  transform: translateX(8px);
}

/* ========== 邦大六馆（参考天一多馆模式） ========== */
.bd-halls {
  background: var(--c-bone);
}
.hall-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 56px;
}
.hall-card {
  position: relative;
  background: #fff;
  overflow: hidden;
  transition: all var(--t-med) var(--ease-out);
  display: block;
  color: inherit;
}
.hall-card--feature {
  grid-column: span 2;
  grid-row: span 2;
}
.hall-card--feature .hall-img {
  aspect-ratio: 4 / 5;
}
.hall-img {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}
.hall-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow) var(--ease-out);
}
.hall-card:hover .hall-img img {
  transform: scale(1.08);
}
.vr-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  background: rgba(184,153,104,0.95);
  color: #fff;
  padding: 6px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.15em;
  font-weight: 600;
}
.hall-info {
  padding: 24px 28px 28px;
}
.hall-tag {
  display: inline-block;
  background: var(--c-brass);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  padding: 4px 12px;
  margin-bottom: 16px;
  text-transform: uppercase;
}
.hall-info h3 {
  font-family: var(--font-serif);
  font-size: clamp(22px, 2vw, 28px);
  color: var(--c-ink);
  margin-bottom: 4px;
}
.hall-en {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-brass);
  margin-bottom: 12px;
}
.hall-info p {
  font-size: 14px;
  color: var(--c-stone);
  line-height: 1.7;
  margin-bottom: 16px;
}
.hall-link {
  font-size: 13px;
  color: var(--c-brass);
  font-weight: 600;
  letter-spacing: 0.05em;
  transition: all var(--t-fast) var(--ease-out);
}
.hall-card:hover .hall-link {
  color: var(--c-brass-deep);
  letter-spacing: 0.08em;
}

/* ========== 标志性工程（参考英良） ========== */
.landmark-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-top: 56px;
}
.landmark-card {
  position: relative;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  display: block;
  background: var(--c-ink-soft);
}
.landmark-card--lg {
  grid-column: span 2;
  aspect-ratio: 4 / 3;
}
.landmark-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--t-slow) var(--ease-out);
}
.landmark-card:hover img {
  transform: scale(1.08);
}
.lm-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(8,8,12,0.92) 100%);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 24px;
  color: #fff;
}
.lm-tag {
  display: inline-block;
  background: var(--c-brass);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  padding: 4px 12px;
  margin-bottom: 12px;
  align-self: flex-start;
  text-transform: uppercase;
}
.lm-overlay h3 {
  font-family: var(--font-serif);
  font-size: clamp(18px, 1.8vw, 24px);
  color: #fff;
  margin-bottom: 6px;
}
.lm-overlay p {
  font-size: 13px;
  color: rgba(255,255,255,0.7);
}

/* ========== 发展历程时间线 ========== */
.timeline {
  margin-top: 56px;
  position: relative;
  padding-left: 60px;
}
.timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: var(--c-brass-soft);
}
.timeline-item {
  position: relative;
  padding: 24px 0 32px;
}
.timeline-item::before {
  content: '';
  position: absolute;
  left: -42px;
  top: 32px;
  width: 12px;
  height: 12px;
  background: var(--c-brass);
  border-radius: 50%;
  box-shadow: 0 0 0 4px var(--c-paper), 0 0 0 5px var(--c-brass-soft);
}
.t-year {
  position: absolute;
  left: -100px;
  top: 24px;
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 600;
  color: var(--c-brass);
  width: 80px;
  text-align: right;
}
.t-content {
  background: #fff;
  padding: 24px 28px;
  border-left: 3px solid var(--c-brass);
  box-shadow: var(--shadow-sm);
}
.t-content h4 {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--c-ink);
  margin-bottom: 8px;
}
.t-content p {
  color: var(--c-stone);
  font-size: 15px;
}

/* ========== 全球布局地图 ========== */
.global {
  background: linear-gradient(180deg, #08080C 0%, #14141A 100%);
  position: relative;
  overflow: hidden;
}
.global::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(184,153,104,0.08) 0%, transparent 40%),
    radial-gradient(circle at 80% 70%, rgba(184,153,104,0.06) 0%, transparent 40%);
  pointer-events: none;
}
.global-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-top: 56px;
  position: relative;
  z-index: 1;
}
.global-region {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(184,153,104,0.25);
  padding: 32px 28px;
  transition: all var(--t-med) var(--ease-out);
}
.global-region:hover {
  background: rgba(255,255,255,0.06);
  border-color: var(--c-brass);
  transform: translateY(-4px);
}
.region-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  color: var(--c-brass);
  margin-bottom: 16px;
}
.global-region h3 {
  font-family: var(--font-serif);
  font-size: 24px;
  color: #fff;
  margin-bottom: 24px;
}
.region-list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.region-list li {
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
  font-size: 14px;
  color: rgba(255,255,255,0.75);
  position: relative;
  padding-left: 16px;
}
.region-list li::before {
  content: '◆';
  position: absolute;
  left: 0;
  color: var(--c-brass);
  font-size: 8px;
  top: 14px;
}
.region-list li:last-child {
  border-bottom: none;
}

/* ========== 资质荣誉 ========== */
.cert-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 20px;
  margin-top: 56px;
}
.cert-card {
  background: #fff;
  border: 1px solid var(--c-brass-soft);
  padding: 28px 20px;
  text-align: center;
  transition: all var(--t-med) var(--ease-out);
}
.cert-card:hover {
  border-color: var(--c-brass);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}
.cert-icon {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  color: var(--c-brass);
  margin-bottom: 16px;
  letter-spacing: 0.05em;
}
.cert-card h4 {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--c-ink);
  margin-bottom: 8px;
}
.cert-card p {
  font-size: 13px;
  color: var(--c-mist);
}

/* ========== CTA Band 升级 ========== */
.cta-band {
  position: relative;
  padding: var(--s-10) 0;
  text-align: center;
  color: #fff;
}
.cta-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.cta-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.cta-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(8,8,12,0.85) 0%, rgba(20,20,26,0.92) 100%);
  z-index: 1;
}
.cta-band .container {
  position: relative;
  z-index: 2;
}
.cta-band h2 {
  font-family: var(--font-serif);
  font-size: clamp(32px, 4vw, 56px);
  color: #fff;
  margin-bottom: 16px;
}
.cta-sub {
  color: rgba(255,255,255,0.7);
  margin-bottom: 40px;
  font-size: 16px;
}

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
  .bc-grid { grid-template-columns: repeat(2, 1fr); }
  .hall-grid { grid-template-columns: repeat(2, 1fr); }
  .hall-card--feature { grid-column: span 2; grid-row: span 1; }
  .hall-card--feature .hall-img { aspect-ratio: 16 / 9; }
  .landmark-grid { grid-template-columns: repeat(2, 1fr); }
  .landmark-card--lg { grid-column: span 2; }
  .global-grid { grid-template-columns: repeat(2, 1fr); }
  .cert-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 768px) {
  .bc-grid { grid-template-columns: 1fr; }
  .hall-grid { grid-template-columns: 1fr; }
  .hall-card--feature { grid-column: span 1; }
  .landmark-grid { grid-template-columns: 1fr; }
  .landmark-card--lg { grid-column: span 1; aspect-ratio: 4 / 3; }
  .global-grid { grid-template-columns: 1fr; }
  .cert-grid { grid-template-columns: repeat(2, 1fr); }
  .timeline { padding-left: 0; }
  .timeline::before { display: none; }
  .t-year { position: static; text-align: left; margin-bottom: 12px; }
}