/* ========== SECTION COMMONS ========== */
.section {
  padding: 80px 0;
}

.section-dark {
  background: var(--bg-dark);
  color: var(--text-on-dark);
}

.section-alt {
  background: var(--bg);
}

.section-head {
  text-align: center;
  margin-bottom: 64px;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 14px;
}

.section-dark .section-label {
  color: var(--primary-light);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.2vw, 2.4rem);
  font-weight: 700;
  line-height: 1.35;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 640px;
  margin: 0 auto;
  line-height: 1.8;
}

.section-dark .section-desc {
  color: var(--text-on-dark-muted);
}

.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition:
    opacity 0.7s ease,
    transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 {
  transition-delay: 0.1s;
}

.reveal-delay-2 {
  transition-delay: 0.2s;
}

.reveal-delay-3 {
  transition-delay: 0.3s;
}

.reveal-delay-4 {
  transition-delay: 0.4s;
}

/* ========== ABOUT ========== */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: stretch;
}

.about-text {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.about-text h3 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  letter-spacing: 0.03em;
}

.about-text p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
  line-height: 1.9;
}

.about-text .highlight {
  color: var(--primary);
  font-weight: 500;
}

.about-mission {
  margin-top: 28px;
  padding: 22px 26px;
  background: rgba(32, 49, 75, 0.08);
  border-left: 3px solid var(--primary-light);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.about-mission .label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  color: var(--primary-light);
  margin-bottom: 6px;
}

.about-mission p {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0;
}

.about-stats {
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: repeat(4, 1fr);
  gap: 20px;
  height: 100%;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  transition:
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.stat-number {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 500;
  color: var(--primary);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.82rem;
  color: var(--text-secondary);
  line-height: 1.5;
}

.stat-card:first-child {
  background: var(--bg-dark);
  border-color: transparent;
}

.stat-card:first-child .stat-number {
  color: var(--primary-light);
}

.stat-card:first-child .stat-label {
  color: var(--text-on-dark-muted);
}

.about-architecture {
  margin-top: 28px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(248, 251, 255, 0.95));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 30px;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
  transition:
    transform 0.35s ease,
    box-shadow 0.35s ease;
}

.about-architecture:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.about-architecture::before {
  content: '';
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: linear-gradient(180deg, var(--primary), var(--primary-light));
  transform: scaleY(0.8);
  transform-origin: top;
}

.about-architecture-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.about-architecture-preview {
  margin-top: 8px;
  border-radius: 18px;
  overflow: hidden;
}

.about-architecture-panel {
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 24px;
  align-items: center;
  padding: 24px;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.96), rgba(248, 251, 255, 0.95));
  border: 1px solid rgba(32, 49, 75, 0.06);
  border-radius: 18px;
}

.about-architecture-copy h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin-bottom: 12px;
  color: var(--primary);
}

.about-architecture-copy p {
  color: var(--text-secondary);
  font-size: 0.94rem;
  line-height: 1.8;
  margin-bottom: 16px;
}

.about-architecture-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.about-architecture-tags span {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  background: rgba(32, 49, 75, 0.08);
  color: var(--primary);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
}

.about-architecture-media {
  position: relative;
  background: linear-gradient(135deg, rgba(15, 32, 55, 0.96), rgba(32, 49, 75, 0.92));
  border-radius: 14px;
  padding: 10px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
  cursor: zoom-in;
  overflow: hidden;
}

.about-architecture-media::after {
  content: '可缩放查看';
  position: absolute;
  right: 14px;
  bottom: 14px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--primary);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  box-shadow: 0 8px 16px rgba(0, 0, 0, 0.16);
  pointer-events: none;
}

.about-architecture-media img {
  width: 100%;
  height: auto;
  max-height: 320px;
  object-fit: contain;
  display: block;
  border-radius: 10px;
  background: #fff;
  transition: transform 0.4s ease;
}

.about-architecture-media:hover img {
  transform: scale(1.02);
}

.about-architecture-lightbox {
  position: fixed;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: rgba(4, 10, 18, 0.82);
  z-index: 3000;
}

.about-architecture-lightbox.active {
  display: flex;
}

.about-architecture-lightbox-content {
  position: relative;
  max-width: min(1200px, 100%);
  width: 100%;
  background: rgba(255, 255, 255, 0.96);
  border-radius: 20px;
  padding: 16px;
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.3);
}

.about-architecture-viewport {
  position: relative;
  width: 100%;
  min-height: min(80vh, 700px);
  border-radius: 12px;
  overflow: hidden;
  background: linear-gradient(135deg, #f5f8fd, #eef3f9);
  display: flex;
  align-items: center;
  justify-content: center;
  touch-action: none;
  cursor: grab;
}

.about-architecture-viewport.is-dragging {
  cursor: grabbing;
}

.about-architecture-viewport img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
  border-radius: 12px;
  background: #fff;
  transform-origin: center center;
  transition: transform 0.15s ease-out;
  user-select: none;
  pointer-events: none;
}

.about-architecture-controls {
  position: absolute;
  top: 14px;
  left: 14px;
  display: flex;
  gap: 8px;
  z-index: 2;
}

.about-architecture-controls button {
  border: none;
  border-radius: 999px;
  width: 36px;
  height: 36px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--primary);
  font-size: 1rem;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.16);
  cursor: pointer;
}

.about-architecture-controls button:hover {
  transform: translateY(-1px);
}

.about-architecture-lightbox-hint {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.95);
  color: var(--text-secondary);
  font-size: 0.74rem;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.14);
  z-index: 2;
}

.about-architecture-lightbox-close {
  position: absolute;
  top: 14px;
  right: 14px;
  width: 38px;
  height: 38px;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.8);
  color: #fff;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 2;
}

@media (max-width: 900px) {
  .about-architecture-panel {
    grid-template-columns: 1fr;
  }
}

/* ========== BUSINESS ========== */
.business-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.business-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px 36px;
  position: relative;
  overflow: hidden;
  transition:
    transform 0.35s ease,
    box-shadow 0.35s ease,
    border-color 0.35s ease;
}

.business-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary-light);
}

.business-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-light));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.4s ease;
}

.business-card:hover::before {
  transform: scaleX(1);
}

.business-card-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.detail-tab {
  position: absolute;
  right: 20px;
  bottom: 20px;
  background: var(--primary);
  color: #fff;
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 0.88rem;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.14);
  transition:
    transform 0.2s ease,
    background 0.2s ease;
  z-index: 1;
}

.detail-tab:hover {
  transform: translateY(-2px);
  background: var(--primary-light);
}

.detail-popup-overlay {
  position: fixed;
  inset: 0;
  background: rgba(8, 15, 29, 0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 2000;
}

.detail-popup-overlay.active {
  opacity: 1;
  pointer-events: auto;
}

.detail-popup-card {
  background: var(--surface);
  border-radius: 24px;
  width: min(760px, calc(100% - 40px));
  max-height: calc(100vh - 80px);
  overflow: auto;
  box-shadow: var(--shadow-lg);
  padding: 28px 28px 24px;
  position: relative;
}

.detail-popup-close {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 38px;
  height: 38px;
  border: none;
  border-radius: 50%;
  background: rgba(15, 23, 42, 0.06);
  color: var(--text);
  font-size: 1.3rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.detail-popup-header h3 {
  margin-bottom: 10px;
  font-size: 1.4rem;
}

.detail-popup-header p {
  color: var(--text-secondary);
  line-height: 1.8;
}

.detail-popup-body {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 22px;
}

.detail-popup-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

.detail-popup-body td {
  padding: 11px 10px;
  border-bottom: 1px solid rgba(15, 23, 42, 0.08);
  vertical-align: top;
}

.detail-popup-body h4 {
  margin-bottom: 10px;
  font-size: 1rem;
  color: var(--primary);
}

.detail-popup-body p {
  color: var(--text-secondary);
  line-height: 1.8;
}

@media (max-width: 760px) {
  .detail-popup-body {
    grid-template-columns: 1fr;
  }

  .detail-tab {
    right: 16px;
    bottom: 16px;
  }
}

.business-card-icon {
  width: 52px;
  height: 52px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 22px;
  background: linear-gradient(135deg, rgba(46, 134, 193, 0.1), rgba(93, 173, 226, 0.05));
}

.business-card-icon svg {
  width: 28px;
  height: 28px;
  stroke: var(--primary);
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.business-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 14px;
  letter-spacing: 0.03em;
}

.business-card p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.85;
  margin-bottom: 18px;
}

.business-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.business-tag {
  font-size: 0.72rem;
  padding: 4px 12px;
  background: var(--bg-section);
  color: var(--text-secondary);
  border-radius: 3px;
  font-weight: 400;
}

.business-card:hover .business-tag {
  background: rgba(46, 134, 193, 0.08);
  color: var(--primary);
}

/* ========== ADVANTAGES ========== */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.adv-item {
  padding: 48px 32px;
  text-align: center;
  border-right: 1px solid rgba(255, 255, 255, 0.06);
  transition: background 0.4s ease;
}

.adv-item:last-child {
  border-right: none;
}

.adv-item:hover {
  background: rgba(255, 255, 255, 0.03);
}

.adv-num {
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 500;
  color: rgba(93, 173, 226, 0.15);
  line-height: 1;
  margin-bottom: 20px;
  transition: color 0.4s;
}

.adv-item:hover .adv-num {
  color: rgba(93, 173, 226, 0.35);
}

.adv-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 18px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.adv-icon svg {
  width: 32px;
  height: 32px;
  stroke: var(--primary-light);
  fill: none;
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.adv-item h4 {
  font-size: 1rem;
  font-weight: 500;
  margin-bottom: 12px;
  color: #fff;
  letter-spacing: 0.03em;
}

.adv-item p {
  font-size: 0.82rem;
  color: var(--text-on-dark-muted);
  line-height: 1.75;
}