/* ============================================
   首页样式 - 工业控制台风格
   ============================================ */

/* Ticker 滚动条 - 数据流 */
.ticker {
  background: var(--c-flame);
  color: var(--c-ink);
  padding: 8px 0;
  overflow: hidden;
  position: relative;
  border-bottom: 1px solid var(--c-line);
  z-index: 10;
}

.ticker-track {
  display: flex;
  gap: var(--s-7);
  animation: marquee 60s linear infinite;
  white-space: nowrap;
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.ticker-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-transform: uppercase;
}

.ticker-item .label {
  opacity: 0.7;
}

.ticker-item .value {
  font-weight: 900;
}

/* ============================================
   Hero - 主视觉（行业特色）
   ============================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
  background: var(--c-ink);
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(255, 87, 34, 0.15), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(74, 144, 226, 0.08), transparent 50%);
  pointer-events: none;
  z-index: 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: var(--s-8);
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-content {
  position: relative;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 6px 12px;
  background: rgba(255, 87, 34, 0.12);
  border: 1px solid var(--c-flame);
  border-radius: var(--r-1);
  color: var(--c-flame);
  font-size: 11px;
  font-weight: 700;
  font-family: var(--f-mono);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--s-5);
}

.hero-tag .dot {
  width: 6px;
  height: 6px;
  background: var(--c-flame);
  border-radius: 50%;
  animation: pulse-dot 1.6s ease-in-out infinite;
  box-shadow: 0 0 0 0 var(--c-flame-glow);
}

.hero-title {
  font-family: var(--f-display);
  font-size: clamp(40px, 6.5vw, 88px);
  font-weight: 900;
  line-height: 0.95;
  letter-spacing: -0.04em;
  margin-bottom: var(--s-5);
  color: var(--c-text);
}

.hero-title .accent {
  display: inline-block;
  color: var(--c-flame);
  position: relative;
}

.hero-title .accent::before {
  content: '';
  position: absolute;
  top: 0.15em;
  left: -0.1em;
  right: -0.1em;
  bottom: 0.15em;
  background: var(--c-flame);
  opacity: 0.1;
  z-index: -1;
  transform: skewX(-6deg);
}

.hero-title .mono {
  font-family: var(--f-mono);
  font-size: 0.5em;
  color: var(--c-hi-vis);
  display: inline-block;
  padding: 0.2em 0.5em;
  background: var(--c-ink-3);
  border: 1px solid var(--c-line);
  border-radius: var(--r-1);
  vertical-align: middle;
  letter-spacing: 0;
  margin: 0 0.2em;
  position: relative;
  top: -0.3em;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--c-text-2);
  line-height: 1.6;
  margin-bottom: var(--s-6);
  max-width: 540px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-3);
  margin-bottom: var(--s-7);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-5);
  padding-top: var(--s-5);
  border-top: 1px solid var(--c-line);
}

.hero-stat-value {
  font-family: var(--f-display);
  font-size: 36px;
  font-weight: 900;
  line-height: 1;
  color: var(--c-text);
  letter-spacing: -0.02em;
}

.hero-stat-value .suffix {
  color: var(--c-flame);
  font-size: 0.7em;
  font-family: var(--f-mono);
}

.hero-stat-label {
  font-size: 11px;
  font-family: var(--f-mono);
  color: var(--c-text-3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 4px;
}

/* Hero 视觉 - 工业仪表盘 */
.hero-visual {
  position: relative;
  height: 580px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-image {
  position: absolute;
  inset: 0;
  border-radius: var(--r-4);
  overflow: hidden;
  border: 1px solid var(--c-line);
}

.hero-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg,
    rgba(10, 11, 14, 0.5) 0%,
    rgba(10, 11, 14, 0.2) 50%,
    rgba(255, 87, 34, 0.15) 100%);
  z-index: 1;
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.1) saturate(0.9);
}

.hero-image::after {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 50%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 87, 34, 0.15), transparent);
  animation: scan 4s linear infinite;
  z-index: 2;
}

/* 浮动HUD卡 */
.hud-card {
  position: absolute;
  background: rgba(17, 20, 26, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--c-line);
  border-radius: var(--r-3);
  padding: var(--s-4);
  z-index: 3;
  box-shadow: var(--sh-3);
  animation: float 4s ease-in-out infinite;
}

.hud-card-1 {
  top: 8%;
  left: -8%;
  width: 240px;
  animation-delay: 0s;
}

.hud-card-2 {
  top: 40%;
  right: -5%;
  width: 220px;
  animation-delay: 1.2s;
}

.hud-card-3 {
  bottom: 8%;
  left: 5%;
  width: 280px;
  animation-delay: 0.6s;
}

.hud-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--s-3);
  padding-bottom: var(--s-2);
  border-bottom: 1px solid var(--c-line);
}

.hud-card-title {
  font-size: 10px;
  font-weight: 700;
  font-family: var(--f-mono);
  color: var(--c-text-3);
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.hud-card-status {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 9px;
  font-family: var(--f-mono);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-toxic);
}

.hud-card-status::before {
  content: '';
  width: 5px;
  height: 5px;
  background: currentColor;
  border-radius: 50%;
  box-shadow: 0 0 0 2px currentColor;
  opacity: 0.4;
}

.hud-oe-code {
  font-family: var(--f-mono);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-hi-vis);
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

.hud-oe-name {
  font-size: 12px;
  color: var(--c-text-2);
  margin-bottom: var(--s-2);
}

.hud-row {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
  font-size: 11px;
  font-family: var(--f-mono);
  color: var(--c-text-3);
  letter-spacing: 0.05em;
}

.hud-row strong {
  color: var(--c-text);
  font-weight: 600;
}

.hud-row .ok { color: var(--c-toxic); }

.hud-stock-bar {
  height: 4px;
  background: var(--c-ink);
  border-radius: 2px;
  overflow: hidden;
  margin-top: var(--s-2);
}

.hud-stock-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--c-flame), var(--c-hi-vis));
  border-radius: 2px;
  width: 0;
  animation: fill 2s var(--ease-out) 0.5s forwards;
}

@keyframes fill {
  to { width: 78%; }
}

.hud-progress {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
}

.hud-progress-item {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.hud-progress-label {
  display: flex;
  justify-content: space-between;
  font-size: 10px;
  font-family: var(--f-mono);
  letter-spacing: 0.05em;
}

.hud-progress-label span:first-child {
  color: var(--c-text-2);
}

.hud-progress-label span:last-child {
  color: var(--c-flame);
  font-weight: 700;
}

.hud-progress-bar {
  height: 3px;
  background: var(--c-ink);
  border-radius: 2px;
  overflow: hidden;
}

.hud-progress-fill {
  height: 100%;
  background: var(--c-flame);
  border-radius: 2px;
  width: 0;
  animation: fill 1.5s var(--ease-out) forwards;
}

.hud-progress-fill.w-1 { --w: 96%; animation-delay: 0.2s; }
.hud-progress-fill.w-2 { --w: 89%; animation-delay: 0.4s; }
.hud-progress-fill.w-3 { --w: 73%; animation-delay: 0.6s; }
.hud-progress-fill.w-4 { --w: 91%; animation-delay: 0.8s; }

@keyframes fill {
  to { width: var(--w); }
}

/* ============================================
   搜索主区 - 核心功能
   ============================================ */
.search-mega {
  padding: var(--s-8) 0;
  background: var(--c-ink-2);
  border-top: 1px solid var(--c-line);
  border-bottom: 1px solid var(--c-line);
  position: relative;
}

.search-mega::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 87, 34, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 87, 34, 0.04) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
  mask-image: radial-gradient(ellipse 100% 100% at 50% 50%, #000 30%, transparent 80%);
}

.search-tabs {
  display: flex;
  gap: 0;
  background: var(--c-ink-3);
  border: 1px solid var(--c-line);
  border-radius: var(--r-2);
  padding: 4px;
  width: fit-content;
  margin-bottom: var(--s-5);
}

.search-tab {
  padding: 10px 20px;
  font-size: 13px;
  font-weight: 700;
  font-family: var(--f-mono);
  letter-spacing: 0.05em;
  color: var(--c-text-3);
  border-radius: var(--r-1);
  transition: all 0.2s var(--ease-out);
  display: flex;
  align-items: center;
  gap: 6px;
}

.search-tab:hover {
  color: var(--c-text);
}

.search-tab.active {
  background: var(--c-flame);
  color: var(--c-ink);
  box-shadow: 0 2px 8px var(--c-flame-glow);
}

.search-tab svg {
  width: 14px;
  height: 14px;
}

.search-card {
  background: var(--c-ink-3);
  border: 1px solid var(--c-line);
  border-radius: var(--r-4);
  padding: var(--s-6);
  position: relative;
  z-index: 1;
}

.search-card-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr auto;
  gap: var(--s-4);
  align-items: end;
}

.search-card-grid .field {
  display: flex;
  flex-direction: column;
}

.search-card-cta {
  display: flex;
  align-items: center;
  gap: var(--s-2);
  height: 50px;
}

.search-card-hint {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  margin-top: var(--s-4);
  padding-top: var(--s-4);
  border-top: 1px dashed var(--c-line);
  font-size: 12px;
  color: var(--c-text-3);
  font-family: var(--f-mono);
}

.search-card-hint kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  height: 22px;
  padding: 0 6px;
  background: var(--c-ink);
  border: 1px solid var(--c-line);
  border-bottom-width: 2px;
  border-radius: var(--r-1);
  font-size: 11px;
  font-family: var(--f-mono);
  color: var(--c-text-2);
  margin: 0 2px;
}

/* ============================================
   核心功能区块 - 三道关卡
   ============================================ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-4);
}

.feature-card {
  background: var(--c-ink-3);
  border: 1px solid var(--c-line);
  border-radius: var(--r-4);
  padding: var(--s-6);
  position: relative;
  overflow: hidden;
  transition: all 0.4s var(--ease-out);
  display: flex;
  flex-direction: column;
  min-height: 460px;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, var(--c-flame-glow), transparent 70%);
  opacity: 0;
  transition: opacity 0.4s var(--ease-out);
}

.feature-card:hover {
  transform: translateY(-4px);
  border-color: var(--c-flame);
  box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4), 0 0 0 1px var(--c-flame);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-num {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--c-flame);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin-bottom: var(--s-4);
}

.feature-num::before {
  content: '';
  width: 24px;
  height: 1px;
  background: var(--c-flame);
}

.feature-icon {
  width: 64px;
  height: 64px;
  background: var(--c-ink);
  border: 1px solid var(--c-line);
  border-radius: var(--r-2);
  display: grid;
  place-items: center;
  margin-bottom: var(--s-5);
  position: relative;
  transition: all 0.3s var(--ease-out);
}

.feature-icon::after {
  content: '';
  position: absolute;
  inset: -1px;
  border-radius: var(--r-2);
  border: 1px solid var(--c-flame);
  opacity: 0;
  transition: opacity 0.3s var(--ease-out);
}

.feature-card:hover .feature-icon::after {
  opacity: 1;
}

.feature-icon svg {
  width: 32px;
  height: 32px;
  color: var(--c-flame);
}

.feature-title {
  font-family: var(--f-display);
  font-size: 26px;
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--c-text);
  margin-bottom: var(--s-3);
}

.feature-desc {
  font-size: 14px;
  color: var(--c-text-2);
  line-height: 1.6;
  margin-bottom: var(--s-5);
  flex: 1;
}

.feature-meta {
  display: flex;
  flex-direction: column;
  gap: var(--s-2);
  padding: var(--s-4);
  background: var(--c-ink);
  border: 1px solid var(--c-line);
  border-radius: var(--r-2);
  margin-bottom: var(--s-5);
}

.feature-meta-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 12px;
  font-family: var(--f-mono);
}

.feature-meta-item .key {
  color: var(--c-text-3);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.feature-meta-item .val {
  color: var(--c-hi-vis);
  font-weight: 700;
}

.feature-link {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-size: 13px;
  font-weight: 700;
  font-family: var(--f-mono);
  color: var(--c-flame);
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding-top: var(--s-3);
  border-top: 1px solid var(--c-line);
  transition: gap 0.2s var(--ease-out);
}

.feature-link:hover {
  gap: var(--s-3);
}

.feature-link svg {
  width: 14px;
  height: 14px;
  transition: transform 0.2s var(--ease-out);
}

.feature-link:hover svg {
  transform: translateX(4px);
}

/* ============================================
   数据中台区块
   ============================================ */
.datacenter {
  background: var(--c-ink);
  position: relative;
  overflow: hidden;
}

.datacenter-inner {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: var(--s-8);
  align-items: center;
}

.datacenter-visual {
  position: relative;
  height: 540px;
  background: var(--c-ink-2);
  border: 1px solid var(--c-line);
  border-radius: var(--r-4);
  overflow: hidden;
  padding: var(--s-5);
}

.dc-image {
  position: absolute;
  inset: 0;
}

.dc-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.4;
  filter: contrast(1.2) saturate(0.7);
}

.dc-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 30%, var(--c-ink) 100%);
}

.dc-overlay {
  position: absolute;
  inset: 0;
  padding: var(--s-5);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  z-index: 1;
}

.dc-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--c-text-2);
}

.dc-top-left {
  display: flex;
  align-items: center;
  gap: var(--s-2);
}

.dc-dot {
  width: 8px;
  height: 8px;
  background: var(--c-toxic);
  border-radius: 50%;
  animation: blink 1.2s ease-in-out infinite;
}

.dc-counters {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--s-3);
}

.dc-counter {
  background: rgba(10, 11, 14, 0.85);
  border: 1px solid var(--c-line);
  border-radius: var(--r-2);
  padding: var(--s-3);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.dc-counter-num {
  font-family: var(--f-display);
  font-size: 28px;
  font-weight: 900;
  line-height: 1;
  color: var(--c-flame);
  letter-spacing: -0.02em;
}

.dc-counter-label {
  font-size: 10px;
  font-family: var(--f-mono);
  color: var(--c-text-3);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-top: 4px;
}

/* ============================================
   数据流 - 流水线条
   ============================================ */
.dataflow {
  padding: var(--s-8) 0;
  background: var(--c-ink-2);
  position: relative;
  overflow: hidden;
}

.dataflow-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border: 1px solid var(--c-line);
  border-radius: var(--r-3);
  background: var(--c-ink);
  overflow: hidden;
}

.dataflow-row {
  display: grid;
  grid-template-columns: 60px 140px 200px 1fr 140px 120px 100px;
  align-items: center;
  gap: var(--s-4);
  padding: var(--s-4);
  font-size: 13px;
  font-family: var(--f-mono);
  border-bottom: 1px solid var(--c-line);
  transition: background 0.2s var(--ease-out);
  position: relative;
}

.dataflow-row:hover {
  background: var(--c-ink-3);
}

.dataflow-row:last-child {
  border-bottom: none;
}

.dataflow-row.header {
  background: var(--c-ink-3);
  color: var(--c-text-3);
  font-size: 10px;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-weight: 700;
}

.dataflow-row .oe-code {
  color: var(--c-hi-vis);
  font-weight: 700;
  letter-spacing: 0.05em;
}

.dataflow-row .part-name {
  color: var(--c-text);
}

.dataflow-row .fit {
  color: var(--c-text-2);
  font-size: 12px;
}

.dataflow-row .stock {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 700;
  font-size: 12px;
  letter-spacing: 0.05em;
}

.dataflow-row .stock::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  box-shadow: 0 0 0 2px currentColor;
  opacity: 0.3;
}

.dataflow-row .stock.in { color: var(--c-toxic); }
.dataflow-row .stock.low { color: var(--c-hi-vis); }
.dataflow-row .stock.out { color: #ef4444; }

.dataflow-row .price {
  color: var(--c-flame);
  font-weight: 700;
}

.dataflow-row .arrow {
  color: var(--c-text-3);
  display: flex;
  justify-content: flex-end;
  transition: color 0.2s var(--ease-out);
}

.dataflow-row:hover .arrow {
  color: var(--c-flame);
}

/* ============================================
   客户类型
   ============================================ */
.audience {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--s-4);
}

.audience-card {
  background: var(--c-ink-3);
  border: 1px solid var(--c-line);
  border-radius: var(--r-3);
  padding: var(--s-5);
  transition: all 0.3s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.audience-card:hover {
  border-color: var(--c-flame);
  transform: translateY(-3px);
}

.audience-icon {
  width: 48px;
  height: 48px;
  background: var(--c-ink);
  border-radius: var(--r-2);
  display: grid;
  place-items: center;
  margin-bottom: var(--s-4);
  color: var(--c-flame);
}

.audience-icon svg {
  width: 24px;
  height: 24px;
}

.audience-title {
  font-family: var(--f-display);
  font-size: 20px;
  font-weight: 900;
  color: var(--c-text);
  margin-bottom: var(--s-2);
}

.audience-desc {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.6;
}

.audience-num {
  position: absolute;
  top: var(--s-4);
  right: var(--s-4);
  font-family: var(--f-mono);
  font-size: 11px;
  color: var(--c-flame);
  font-weight: 700;
  letter-spacing: 0.1em;
}

/* ============================================
   流程区块
   ============================================ */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  position: relative;
}

.steps::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 60px;
  right: 60px;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--c-line) 0, var(--c-line) 4px, transparent 4px, transparent 12px);
  z-index: 0;
}

.step {
  position: relative;
  padding: 0 var(--s-3);
  text-align: center;
}

.step-circle {
  width: 72px;
  height: 72px;
  background: var(--c-ink-3);
  border: 2px solid var(--c-line);
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin: 0 auto var(--s-4);
  font-family: var(--f-display);
  font-size: 28px;
  font-weight: 900;
  color: var(--c-text-2);
  position: relative;
  z-index: 1;
  transition: all 0.3s var(--ease-out);
}

.step:hover .step-circle {
  border-color: var(--c-flame);
  color: var(--c-flame);
  transform: scale(1.05);
  box-shadow: 0 0 0 8px rgba(255, 87, 34, 0.08);
}

.step-title {
  font-family: var(--f-display);
  font-size: 20px;
  font-weight: 900;
  margin-bottom: var(--s-2);
  color: var(--c-text);
}

.step-desc {
  font-size: 13px;
  color: var(--c-text-2);
  line-height: 1.6;
}

/* ============================================
   FAQ
   ============================================ */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0;
  border-top: 1px solid var(--c-line);
}

.faq-item {
  border-bottom: 1px solid var(--c-line);
  overflow: hidden;
  transition: background 0.2s var(--ease-out);
}

.faq-item:hover {
  background: rgba(255, 87, 34, 0.03);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-4);
  padding: var(--s-5) 0;
  text-align: left;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-text);
  cursor: pointer;
  transition: color 0.2s var(--ease-out);
}

.faq-question:hover {
  color: var(--c-flame);
}

.faq-q-text {
  display: flex;
  align-items: center;
  gap: var(--s-3);
  flex: 1;
}

.faq-q-num {
  font-family: var(--f-mono);
  font-size: 13px;
  color: var(--c-flame);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.faq-icon {
  width: 32px;
  height: 32px;
  border: 1px solid var(--c-line);
  border-radius: 50%;
  display: grid;
  place-items: center;
  color: var(--c-text-2);
  flex-shrink: 0;
  transition: all 0.3s var(--ease-out);
}

.faq-item.open .faq-icon {
  background: var(--c-flame);
  color: var(--c-ink);
  border-color: var(--c-flame);
  transform: rotate(45deg);
}

.faq-icon svg {
  width: 14px;
  height: 14px;
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--ease-out);
}

.faq-item.open .faq-answer {
  max-height: 500px;
}

.faq-answer-inner {
  padding: 0 0 var(--s-5) 36px;
  font-size: 15px;
  color: var(--c-text-2);
  line-height: 1.7;
  max-width: 720px;
}

/* ============================================
   CTA 区块
   ============================================ */
.cta {
  padding: var(--s-9) 0;
  background: var(--c-flame);
  color: var(--c-ink);
  position: relative;
  overflow: hidden;
}

.cta::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(0, 0, 0, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 0, 0, 0.08) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.cta-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.cta-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  font-family: var(--f-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  background: var(--c-ink);
  color: var(--c-flame);
  padding: 6px 12px;
  border-radius: var(--r-1);
  margin-bottom: var(--s-5);
}

.cta-title {
  font-family: var(--f-display);
  font-size: clamp(36px, 5vw, 64px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin-bottom: var(--s-4);
}

.cta-subtitle {
  font-size: 18px;
  margin-bottom: var(--s-6);
  opacity: 0.85;
}

.cta-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--s-3);
}

.cta .btn-dark {
  background: var(--c-ink);
  color: var(--c-flame);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.3);
}

.cta .btn-dark:hover {
  background: var(--c-ink-2);
  color: var(--c-flame);
  transform: translateY(-1px);
}

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

.cta .btn-outline-dark:hover {
  background: var(--c-ink);
  color: var(--c-flame);
}

/* ============================================
   响应式
   ============================================ */
@media (max-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: var(--s-6);
  }

  .hero-visual {
    height: 480px;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .feature-card {
    min-height: auto;
  }

  .datacenter-inner {
    grid-template-columns: 1fr;
  }

  .datacenter-visual {
    height: 420px;
  }

  .audience {
    grid-template-columns: repeat(2, 1fr);
  }

  .steps {
    grid-template-columns: 1fr;
    gap: var(--s-6);
  }

  .steps::before {
    display: none;
  }

  .dataflow-row {
    grid-template-columns: 1fr 1fr;
    gap: var(--s-2);
  }

  .dataflow-row .fit {
    grid-column: 1 / -1;
  }

  .dataflow-row .arrow {
    display: none;
  }

  .dataflow-row.header {
    display: none;
  }
}

@media (max-width: 768px) {
  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }

  .hero-visual {
    height: 360px;
  }

  .hud-card-1 {
    width: 200px;
    left: 0;
  }

  .hud-card-2 {
    width: 180px;
    right: 0;
  }

  .hud-card-3 {
    width: 220px;
  }

  .search-card-grid {
    grid-template-columns: 1fr;
  }

  .search-card-cta {
    width: 100%;
  }

  .search-tabs {
    width: 100%;
    overflow-x: auto;
  }

  .audience {
    grid-template-columns: 1fr;
  }

  .hero-stats {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 40px;
  }

  .hero-title .mono {
    display: inline-block;
    margin: 4px 0;
  }

  .hud-card-1, .hud-card-2, .hud-card-3 {
    position: relative;
    width: 100%;
    top: auto;
    left: auto;
    right: auto;
    bottom: auto;
    margin-bottom: var(--s-3);
  }

  .hero-visual {
    height: auto;
    display: flex;
    flex-direction: column;
  }

  .hero-image {
    position: relative;
    height: 240px;
  }
}