/* ==========================================================================
   components.css — 按钮 / 卡片 / 统计 / Tab / 流程 / 徽标墙 / 表单 / 表格 /
                    架构图 / 页头横幅 / 要点列表 / 引用 / CTA / 徽章 / 返回顶部
   ========================================================================== */

/* --------------------------------------------------------------------------
   图标（线性 SVG，stroke=currentColor）
   用法：<i class="icon icon--cluster" aria-hidden="true"></i>
   通过 CSS mask 着色，颜色跟随 color；mask 图像内联为 data: URI（源文件见 assets/img/icons/），
   避免 file:// 双击打开时外链 mask 被 Chromium CORS 拦截
   -------------------------------------------------------------------------- */
.icon {
  display: inline-block;
  width: 24px;
  height: 24px;
  flex-shrink: 0;
  background-color: currentColor;
  -webkit-mask: var(--icon) center / contain no-repeat;
  mask: var(--icon) center / contain no-repeat;
}

.icon--sm { width: 18px; height: 18px; }
.icon--lg { width: 32px; height: 32px; }

.icon--cluster      { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='3' width='18' height='5' rx='1.5'/%3E%3Crect x='3' y='9.5' width='18' height='5' rx='1.5'/%3E%3Crect x='3' y='16' width='18' height='5' rx='1.5'/%3E%3Cpath d='M6.5 5.5h.01M6.5 12h.01M6.5 18.5h.01M17 5.5h1M17 12h1M17 18.5h1'/%3E%3C/svg%3E"); }
.icon--cross-border { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='9'/%3E%3Cpath d='M3 12h18M12 3c2.6 2.6 3.9 5.6 3.9 9s-1.3 6.4-3.9 9c-2.6-2.6-3.9-5.6-3.9-9S9.4 5.6 12 3z'/%3E%3Cpath d='M15.5 8.5l3-3M18.5 8.5v-3h-3'/%3E%3C/svg%3E"); }
.icon--procurement  { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9 4h6a1 1 0 0 1 1 1v1H8V5a1 1 0 0 1 1-1z'/%3E%3Cpath d='M16 5h2a2 2 0 0 1 2 2v12a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V7a2 2 0 0 1 2-2h2'/%3E%3Cpath d='M8.5 13l2.2 2.2L15.5 10.5'/%3E%3C/svg%3E"); }
.icon--operation    { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M4 16a8 8 0 1 1 16 0'/%3E%3Cpath d='M12 16l4-5'/%3E%3Ccircle cx='12' cy='16' r='1.5'/%3E%3Cpath d='M4 20h16M6.5 10.5l-.7-.7M17.5 10.5l.7-.7M12 7V6'/%3E%3C/svg%3E"); }
.icon--dual-drive   { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='8.5' cy='12' r='5.5'/%3E%3Ccircle cx='15.5' cy='12' r='5.5'/%3E%3Cpath d='M12 3.5V2M12 22v-1.5'/%3E%3C/svg%3E"); }
.icon--tech-stack   { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3l9 4.5-9 4.5-9-4.5L12 3z'/%3E%3Cpath d='M3 12l9 4.5 9-4.5'/%3E%3Cpath d='M3 16.5L12 21l9-4.5'/%3E%3C/svg%3E"); }
.icon--compliance   { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 2.5l7.5 3v6c0 4.6-3.2 8.5-7.5 10-4.3-1.5-7.5-5.4-7.5-10v-6l7.5-3z'/%3E%3Cpath d='M8.5 12l2.3 2.3 4.7-4.8'/%3E%3C/svg%3E"); }
.icon--customer     { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='9' cy='8' r='3.5'/%3E%3Cpath d='M2.5 20a6.5 6.5 0 0 1 13 0'/%3E%3Cpath d='M15.5 4.8a3.5 3.5 0 0 1 0 6.4'/%3E%3Cpath d='M17 14.2a6.5 6.5 0 0 1 4.5 5.8'/%3E%3C/svg%3E"); }
.icon--os           { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='6' y='6' width='12' height='12' rx='2'/%3E%3Crect x='9.5' y='9.5' width='5' height='5' rx='1'/%3E%3Cpath d='M9 2.5V6M12 2.5V6M15 2.5V6M9 18v3.5M12 18v3.5M15 18v3.5M2.5 9H6M2.5 12H6M2.5 15H6M18 9h3.5M18 12h3.5M18 15h3.5'/%3E%3C/svg%3E"); }
.icon--link         { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M10 14a4.5 4.5 0 0 0 6.4 0l2.8-2.8a4.5 4.5 0 0 0-6.4-6.4L11.5 6'/%3E%3Cpath d='M14 10a4.5 4.5 0 0 0-6.4 0l-2.8 2.8a4.5 4.5 0 0 0 6.4 6.4L12.5 18'/%3E%3C/svg%3E"); }
.icon--scheduler    { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='2.5' y='9.5' width='5' height='5' rx='1'/%3E%3Crect x='16.5' y='3' width='5' height='5' rx='1'/%3E%3Crect x='16.5' y='9.5' width='5' height='5' rx='1'/%3E%3Crect x='16.5' y='16' width='5' height='5' rx='1'/%3E%3Cpath d='M7.5 12h4M11.5 12V5.5h5M11.5 12h5M11.5 12v6.5h5'/%3E%3C/svg%3E"); }
.icon--net          { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='12' cy='12' r='2.5'/%3E%3Ccircle cx='12' cy='4' r='1.8'/%3E%3Ccircle cx='12' cy='20' r='1.8'/%3E%3Ccircle cx='4' cy='12' r='1.8'/%3E%3Ccircle cx='20' cy='12' r='1.8'/%3E%3Cpath d='M12 5.8v3.7M12 14.5v3.7M5.8 12h3.7M14.5 12h3.7'/%3E%3C/svg%3E"); }
.icon--maas         { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 3l8 4.5v9L12 21l-8-4.5v-9L12 3z'/%3E%3Cpath d='M4 7.5l8 4.5 8-4.5M12 12v9'/%3E%3Cpath d='M9.5 8.5l5-2.8' opacity='0.6'/%3E%3C/svg%3E"); }
.icon--eye          { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M2.5 12s3.5-6.5 9.5-6.5 9.5 6.5 9.5 6.5-3.5 6.5-9.5 6.5S2.5 12 2.5 12z'/%3E%3Ccircle cx='12' cy='12' r='3'/%3E%3C/svg%3E"); }
.icon--location     { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M12 21s-6.5-5.6-6.5-11a6.5 6.5 0 1 1 13 0c0 5.4-6.5 11-6.5 11z'/%3E%3Ccircle cx='12' cy='10' r='2.5'/%3E%3C/svg%3E"); }
.icon--mail         { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='5' width='18' height='14' rx='2'/%3E%3Cpath d='m3.5 7 8.5 6 8.5-6'/%3E%3C/svg%3E"); }
.icon--phone        { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M5 4h4l2 5-2.5 1.5a11 11 0 0 0 5 5L15 13l5 2v4a2 2 0 0 1-2 2A16 16 0 0 1 3 6a2 2 0 0 1 2-2z'/%3E%3C/svg%3E"); }
.icon--wechat       { --icon: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='%23000' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M9.5 4C5.4 4 2.5 6.6 2.5 9.8c0 1.8.9 3.4 2.4 4.5L4 17l3-1.5c.8.2 1.6.3 2.5.3'/%3E%3Cpath d='M8.5 15.5c0 3 3 5.4 6.6 5.4.8 0 1.5-.1 2.2-.3l2.7 1.3-.8-2.4c1.3-1 2.3-2.4 2.3-4 0-3-3-5.4-6.6-5.4s-6.4 2.4-6.4 5.4z'/%3E%3Cpath d='M7 9h.01M12 9h.01M13 15h.01M17 15h.01'/%3E%3C/svg%3E"); }

/* --------------------------------------------------------------------------
   按钮
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 28px;
  font-size: 15px;
  font-weight: 600;
  line-height: 1;
  white-space: nowrap;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background var(--dur), color var(--dur), border-color var(--dur), transform var(--dur), box-shadow var(--dur);
}

.btn:hover {
  transform: translateY(-1px);
}

.btn:active {
  transform: translateY(0);
}

.btn--primary {
  background: var(--c-primary);
  color: #fff;
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.28);
}

.btn--primary:hover {
  background: var(--c-primary-dark);
  color: #fff;
  box-shadow: 0 6px 20px rgba(37, 99, 235, 0.36);
}

.btn--outline {
  background: transparent;
  color: var(--c-primary);
  border-color: var(--c-primary);
}

.btn--outline:hover {
  background: var(--c-primary-soft);
  color: var(--c-primary-dark);
}

/* 深色底使用 */
.btn--light {
  background: rgba(255, 255, 255, 0.06);
  color: #fff;
  border-color: rgba(230, 238, 248, 0.32);
  backdrop-filter: blur(4px);
}

.btn--light:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  border-color: var(--c-accent);
}

.btn--lg {
  height: 56px;
  padding: 0 36px;
  font-size: 16px;
}

.btn--sm {
  height: 38px;
  padding: 0 18px;
  font-size: 14px;
}

.btn__arrow {
  width: 16px;
  height: 16px;
  transition: transform var(--dur) var(--ease-out);
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

/* 行内文字链接（带箭头） */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  color: var(--c-primary);
}

.link-arrow::after {
  content: "\2192";
  font-family: var(--font-num);
  transition: transform var(--dur) var(--ease-out);
}

.link-arrow:hover::after {
  transform: translateX(4px);
}

.section--dark .link-arrow {
  color: var(--c-accent);
}

/* --------------------------------------------------------------------------
   卡片
   -------------------------------------------------------------------------- */
.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 32px 28px;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: transform var(--dur) var(--ease-out), box-shadow var(--dur), border-color var(--dur);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(37, 99, 235, 0.3);
}

.card--link {
  color: inherit;
}

.card--link:hover {
  color: inherit;
}

.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px;
  height: 52px;
  margin-bottom: 20px;
  color: var(--c-primary);
  background: var(--c-primary-soft);
  border-radius: 12px;
  transition: background var(--dur), color var(--dur);
}

.card__icon .icon {
  width: 26px;
  height: 26px;
}

.card:hover .card__icon {
  background: var(--c-primary);
  color: #fff;
}

.card__title {
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--c-text);
}

.card__subtitle {
  margin-top: 4px;
  font-size: var(--fs-small);
  color: var(--c-text-2);
}

.card__text {
  margin-top: 12px;
  font-size: 15px;
  color: var(--c-text-2);
  flex-grow: 1;
}

.card__link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-primary);
}

.card__link::after {
  content: "\2192";
  font-family: var(--font-num);
  transition: transform var(--dur) var(--ease-out);
}

.card:hover .card__link::after {
  transform: translateX(4px);
}

/* 深色卡片（深色区块中使用） */
.section--dark .card,
.card--dark {
  background: rgba(255, 255, 255, 0.04);
  border-color: var(--c-border-dark);
  box-shadow: none;
}

.section--dark .card:hover,
.card--dark:hover {
  border-color: rgba(34, 211, 238, 0.4);
  box-shadow: var(--shadow-glow);
}

.section--dark .card__title,
.card--dark .card__title { color: #fff; }

.section--dark .card__text,
.card--dark .card__text { color: var(--c-text-inverse-2); }

.section--dark .card__icon,
.card--dark .card__icon {
  color: var(--c-accent);
  background: var(--c-accent-soft);
}

.section--dark .card__link,
.card--dark .card__link { color: var(--c-accent); }

/* 带编号的卡片 */
.card__num {
  position: absolute;
  top: 24px;
  right: 24px;
  font-family: var(--font-num);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--c-border);
  transition: color var(--dur);
}

.card:hover .card__num {
  color: var(--c-primary);
}

/* --------------------------------------------------------------------------
   统计数字
   -------------------------------------------------------------------------- */
.stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.stat {
  position: relative;
  padding: 28px 24px 28px 28px;
  border-left: 2px solid var(--c-border);
  transition: border-color var(--dur);
}

.stat:hover {
  border-left-color: var(--c-primary);
}

.stat__value {
  display: flex;
  align-items: baseline;
  gap: 4px;
  flex-wrap: wrap;
}

.stat__num {
  font-family: var(--font-num);
  font-size: 48px;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-text);
  font-variant-numeric: tabular-nums;
}

.stat__unit {
  font-size: 18px;
  font-weight: 600;
  color: var(--c-primary);
}

.stat__label {
  margin-top: 12px;
  font-size: 15px;
  color: var(--c-text-2);
}

.section--dark .stat { border-left-color: var(--c-border-dark); }
.section--dark .stat:hover { border-left-color: var(--c-accent); }
.section--dark .stat__num { color: #fff; }
.section--dark .stat__unit { color: var(--c-accent); }
.section--dark .stat__label { color: var(--c-text-inverse-2); }

@media (max-width: 992px) {
  .stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .stat__num { font-size: 40px; }
}

@media (max-width: 480px) {
  .stats { gap: 16px; }
  .stat { padding: 16px 12px 16px 16px; }
  .stat__num { font-size: 32px; }
  .stat__unit { font-size: 15px; }
  .stat__label { font-size: 13px; }
}

/* --------------------------------------------------------------------------
   Tabs
   -------------------------------------------------------------------------- */
.tabs__nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
  padding: 6px;
  background: var(--c-bg);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}

.tabs__btn {
  flex: 1 1 auto;
  padding: 12px 20px;
  font-size: 15px;
  font-weight: 500;
  color: var(--c-text-2);
  text-align: center;
  border-radius: var(--radius-sm);
  transition: background var(--dur), color var(--dur), box-shadow var(--dur);
}

.tabs__btn:hover {
  color: var(--c-primary);
}

.tabs__btn.is-active {
  background: var(--c-surface);
  color: var(--c-primary);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.tabs__panel {
  display: none;
}

.tabs__panel.is-active {
  display: block;
  animation: tabs-in 0.4s var(--ease-out);
}

@keyframes tabs-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

@media (max-width: 768px) {
  .tabs__nav {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .tabs__nav::-webkit-scrollbar { display: none; }

  .tabs__btn {
    flex: 0 0 auto;
    padding: 10px 16px;
    font-size: 14px;
  }
}

/* --------------------------------------------------------------------------
   流程步骤
   -------------------------------------------------------------------------- */
.steps {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 32px 24px 28px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--c-border-dark);
  border-radius: var(--radius);
  transition: border-color var(--dur), transform var(--dur) var(--ease-out), box-shadow var(--dur);
}

.step:hover {
  transform: translateY(-4px);
  border-color: rgba(34, 211, 238, 0.4);
  box-shadow: var(--shadow-glow);
}

/* 连接线（桌面端） */
.step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: 52px;
  right: -24px;
  width: 24px;
  height: 1px;
  background: linear-gradient(90deg, var(--c-accent), rgba(34, 211, 238, 0.2));
}

.step__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  margin-bottom: 20px;
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  color: var(--c-dark);
  background: var(--c-accent);
  border-radius: 50%;
  box-shadow: 0 0 0 6px rgba(34, 211, 238, 0.14);
}

.step__title {
  font-size: 19px;
  font-weight: 600;
  color: #fff;
}

.step__text {
  margin-top: 10px;
  font-size: 15px;
  color: var(--c-text-inverse-2);
}

/* 浅色区块中的步骤 */
.steps--light .step {
  background: var(--c-surface);
  border-color: var(--c-border);
  box-shadow: var(--shadow-sm);
}

.steps--light .step:hover {
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: var(--shadow-md);
}

.steps--light .step:not(:last-child)::after {
  background: linear-gradient(90deg, var(--c-primary), rgba(37, 99, 235, 0.2));
}

.steps--light .step__index {
  color: #fff;
  background: var(--c-primary);
  box-shadow: 0 0 0 6px var(--c-primary-soft);
}

.steps--light .step__title { color: var(--c-text); }
.steps--light .step__text { color: var(--c-text-2); }

@media (max-width: 992px) {
  .steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .step:nth-child(2n)::after { display: none; }
}

@media (max-width: 768px) {
  .steps { grid-template-columns: 1fr; gap: 16px; }

  .step { display: grid; grid-template-columns: 40px 1fr; column-gap: 16px; padding: 24px 20px; }
  .step__index { grid-row: 1 / 3; margin-bottom: 0; }
  .step__title { font-size: 17px; align-self: center; }
  .step__text { grid-column: 2; margin-top: 6px; }

  /* 纵向连接线 */
  .step:not(:last-child)::after {
    top: auto;
    right: auto;
    bottom: -16px;
    left: 40px;
    width: 1px;
    height: 16px;
    display: block;
    background: linear-gradient(180deg, var(--c-accent), rgba(34, 211, 238, 0.2));
  }

  .steps--light .step:not(:last-child)::after {
    background: linear-gradient(180deg, var(--c-primary), rgba(37, 99, 235, 0.2));
  }
}

/* --------------------------------------------------------------------------
   徽标墙（文字徽标卡片）
   -------------------------------------------------------------------------- */
.logo-wall {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.logo-wall--3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.logo-wall__group-title {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 20px;
  font-size: 15px;
  font-weight: 600;
  color: var(--c-text);
}

.logo-wall__group-title small {
  font-family: var(--font-num);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--c-text-2);
}

.logo-wall__group-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--c-border);
}

.logo-wall__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  min-height: 108px;
  padding: 20px 16px;
  text-align: center;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease-out), box-shadow var(--dur), border-color var(--dur);
}

.logo-wall__item:hover {
  transform: translateY(-3px);
  border-color: rgba(37, 99, 235, 0.3);
  box-shadow: var(--shadow-md);
}

.logo-wall__cn {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-text);
}

.logo-wall__en {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-2);
}

.logo-wall__item--en-only .logo-wall__cn {
  font-family: var(--font-num);
  font-size: 17px;
  letter-spacing: 0.02em;
}

@media (max-width: 992px) {
  .logo-wall,
  .logo-wall--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 480px) {
  .logo-wall__item { min-height: 88px; padding: 16px 12px; }
  .logo-wall__cn { font-size: 17px; }
}

/* --------------------------------------------------------------------------
   内页页头横幅
   -------------------------------------------------------------------------- */
.page-hero {
  position: relative;
  padding: 72px 0 64px;
  background: var(--c-dark);
  color: var(--c-text-inverse);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 80% at 85% 50%, rgba(37, 99, 235, 0.35), transparent 60%),
    radial-gradient(ellipse 40% 60% at 70% 0%, rgba(34, 211, 238, 0.14), transparent 60%);
  pointer-events: none;
}

.page-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(230, 238, 248, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(230, 238, 248, 0.06) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent);
  pointer-events: none;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero .breadcrumb {
  margin-bottom: 24px;
}

.page-hero__eyebrow {
  color: var(--c-accent);
  margin-bottom: 16px;
}

.page-hero__title {
  color: #fff;
  max-width: 800px;
}

.page-hero__sub {
  margin-top: 20px;
  max-width: 680px;
  font-size: 18px;
  color: var(--c-text-inverse-2);
}

@media (max-width: 768px) {
  .page-hero { padding: 48px 0 40px; }
  .page-hero__sub { font-size: 16px; }
}

/* --------------------------------------------------------------------------
   分层架构图
   结构：.arch > .arch__main(.arch__layer*) + .arch__side
   -------------------------------------------------------------------------- */
.arch {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 120px;
  gap: 16px;
  padding: 28px;
  background: var(--c-dark);
  border: 1px solid var(--c-border-dark);
  border-radius: var(--radius);
  color: var(--c-text-inverse);
  overflow: hidden;
}

.arch__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.5;
  pointer-events: none;
}

.arch__main,
.arch__side {
  position: relative;
  z-index: 1;
}

.arch__main {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.arch__layer {
  display: grid;
  grid-template-columns: 120px 1fr;
  align-items: stretch;
  gap: 12px;
}

.arch__label {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--c-text-inverse-2);
  border-right: 2px solid rgba(34, 211, 238, 0.4);
}

.arch__label small {
  display: block;
  margin-top: 2px;
  font-family: var(--font-num);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.6;
}

.arch__items {
  display: flex;
  gap: 12px;
}

.arch__item {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding: 16px 20px;
  color: #fff;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.28), rgba(37, 99, 235, 0.12));
  border: 1px solid rgba(37, 99, 235, 0.45);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur), box-shadow var(--dur), transform var(--dur) var(--ease-out), background var(--dur);
}

.arch__item:hover,
.arch__item.is-active {
  color: #fff;
  border-color: var(--c-accent);
  box-shadow: var(--shadow-glow);
  transform: translateY(-2px);
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.22), rgba(37, 99, 235, 0.2));
}

.arch__item strong {
  font-family: var(--font-num);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.arch__item span {
  font-size: 13px;
  color: var(--c-text-inverse-2);
}

.arch__item--accent {
  background: linear-gradient(135deg, rgba(34, 211, 238, 0.24), rgba(34, 211, 238, 0.08));
  border-color: rgba(34, 211, 238, 0.5);
}

/* 右侧贯穿层（如 LSC-Eye） */
.arch__side {
  display: flex;
}

.arch__side .arch__item {
  justify-content: center;
  align-items: center;
  text-align: center;
  writing-mode: vertical-rl;
  padding: 20px 14px;
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.2), rgba(34, 211, 238, 0.06));
  border-color: rgba(34, 211, 238, 0.5);
}

.arch__side .arch__item strong {
  letter-spacing: 0.08em;
}

.arch__side .arch__item span {
  letter-spacing: 0.1em;
}

@media (max-width: 768px) {
  .arch {
    grid-template-columns: 1fr;
    padding: 20px;
  }

  .arch__layer {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .arch__label {
    padding: 0 0 4px;
    border-right: 0;
    border-bottom: 1px solid rgba(34, 211, 238, 0.3);
    flex-direction: row;
    align-items: baseline;
    gap: 10px;
  }

  .arch__label small { margin-top: 0; }

  .arch__items { flex-direction: column; gap: 8px; }

  .arch__item { padding: 14px 16px; }

  .arch__side .arch__item {
    writing-mode: horizontal-tb;
    flex-direction: row;
    gap: 10px;
    padding: 14px 16px;
  }
}

/* --------------------------------------------------------------------------
   要点列表（带勾选图标）
   -------------------------------------------------------------------------- */
.feature-list li {
  position: relative;
  padding-left: 32px;
  color: var(--c-text);
}

.feature-list li + li {
  margin-top: 12px;
}

.feature-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 3px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background-color: var(--c-primary-soft);
}

.feature-list li::after {
  content: "";
  position: absolute;
  left: 6px;
  top: 7px;
  width: 8px;
  height: 5px;
  border-left: 2px solid var(--c-primary);
  border-bottom: 2px solid var(--c-primary);
  transform: rotate(-45deg);
}

.section--dark .feature-list li,
.feature-list--light li { color: var(--c-text-inverse); }

.section--dark .feature-list li::before,
.feature-list--light li::before { background-color: var(--c-accent-soft); }

.section--dark .feature-list li::after,
.feature-list--light li::after { border-color: var(--c-accent); }

/* --------------------------------------------------------------------------
   引用块
   -------------------------------------------------------------------------- */
.quote {
  position: relative;
  padding: 28px 32px 28px 40px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--c-text);
  background: var(--c-bg);
  border-left: 3px solid var(--c-primary);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.quote::before {
  content: "\201C";
  position: absolute;
  top: 4px;
  left: 14px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 56px;
  line-height: 1;
  color: var(--c-primary);
  opacity: 0.25;
}

.quote cite {
  display: block;
  margin-top: 12px;
  font-size: var(--fs-small);
  font-style: normal;
  color: var(--c-text-2);
}

.section--dark .quote {
  color: var(--c-text-inverse);
  background: rgba(255, 255, 255, 0.04);
  border-left-color: var(--c-accent);
}

.section--dark .quote::before { color: var(--c-accent); }

/* --------------------------------------------------------------------------
   CTA 横幅
   -------------------------------------------------------------------------- */
.cta-band {
  position: relative;
  padding: 72px 0;
  background: linear-gradient(120deg, var(--c-primary-dark), var(--c-primary) 55%, #0E7490);
  color: #fff;
  overflow: hidden;
}

.cta-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 40px 40px;
  mask-image: radial-gradient(ellipse 70% 100% at 100% 50%, #000, transparent);
  -webkit-mask-image: radial-gradient(ellipse 70% 100% at 100% 50%, #000, transparent);
  pointer-events: none;
}

.cta-band .container {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}

.cta-band__title {
  font-size: 32px;
  font-weight: 700;
  color: #fff;
}

.cta-band__text {
  margin-top: 12px;
  max-width: 640px;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.82);
}

.cta-band .btn--light {
  background: #fff;
  color: var(--c-primary-dark);
  border-color: #fff;
}

.cta-band .btn--light:hover {
  background: var(--c-bg);
  color: var(--c-primary-dark);
}

@media (max-width: 768px) {
  .cta-band { padding: 56px 0; }
  .cta-band .container { flex-direction: column; align-items: flex-start; }
  .cta-band__title { font-size: 26px; }
}

/* --------------------------------------------------------------------------
   表单
   -------------------------------------------------------------------------- */
.form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form__row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.form__field {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.form__label {
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--c-text);
}

.form__label .req {
  color: var(--c-danger);
  margin-left: 2px;
}

.form__input,
.form__select,
.form__textarea {
  width: 100%;
  height: 48px;
  padding: 0 16px;
  font-size: 15px;
  color: var(--c-text);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--dur), box-shadow var(--dur);
  appearance: none;
  -webkit-appearance: none;
}

.form__textarea {
  height: auto;
  min-height: 140px;
  padding: 12px 16px;
  resize: vertical;
}

.form__select {
  padding-right: 40px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
}

.form__input::placeholder,
.form__textarea::placeholder {
  color: #94A3B8;
}

.form__input:focus,
.form__select:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px var(--c-primary-soft);
}

.form__field.has-error .form__input,
.form__field.has-error .form__select,
.form__field.has-error .form__textarea {
  border-color: var(--c-danger);
}

.form__error {
  display: none;
  font-size: 13px;
  color: var(--c-danger);
}

.form__field.has-error .form__error {
  display: block;
}

.form__note {
  font-size: 13px;
  color: var(--c-text-2);
}

.form__success {
  display: none;
  padding: 16px 20px;
  font-size: 15px;
  color: #166534;
  background: #F0FDF4;
  border: 1px solid #BBF7D0;
  border-radius: var(--radius-sm);
}

.form__success.is-visible {
  display: block;
}

.form__actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.form .btn[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

@media (max-width: 768px) {
  .form__row { grid-template-columns: 1fr; }
}

/* --------------------------------------------------------------------------
   表格（响应式：外层 .table-wrap 横向滚动）
   -------------------------------------------------------------------------- */
.table-wrap {
  width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--c-border);
  border-radius: var(--radius);
}

.table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 15px;
}

.table th,
.table td {
  padding: 14px 20px;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--c-border);
}

.table th {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-text-2);
  background: var(--c-bg);
  white-space: nowrap;
}

.table tbody tr:last-child td {
  border-bottom: 0;
}

.table tbody tr:hover td {
  background: rgba(37, 99, 235, 0.03);
}

.table td strong {
  color: var(--c-text);
}

/* --------------------------------------------------------------------------
   徽章
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 26px;
  padding: 0 10px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--c-primary);
  background: var(--c-primary-soft);
  border: 1px solid rgba(37, 99, 235, 0.2);
  border-radius: var(--radius-pill);
  white-space: nowrap;
}

.badge--accent {
  color: #0E7490;
  background: var(--c-accent-soft);
  border-color: rgba(34, 211, 238, 0.35);
}

.badge--dark {
  color: var(--c-accent);
  background: rgba(34, 211, 238, 0.1);
  border-color: rgba(34, 211, 238, 0.35);
}

.badge--neutral {
  color: var(--c-text-2);
  background: var(--c-bg);
  border-color: var(--c-border);
}

.badge__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

/* --------------------------------------------------------------------------
   返回顶部
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 80;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--c-primary);
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: 50%;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--dur), transform var(--dur) var(--ease-out), visibility var(--dur), background var(--dur), color var(--dur);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: none;
}

.back-to-top:hover {
  color: #fff;
  background: var(--c-primary);
  border-color: var(--c-primary);
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

@media (max-width: 768px) {
  .back-to-top {
    right: 16px;
    bottom: 16px;
    width: 40px;
    height: 40px;
  }
}