/* ==========================================================================
   sections.css — 11 个区块的布局与视觉，各区块响应式就近归入文末媒体查询
   ========================================================================== */

/* ======================== Hero ======================== */
.hero {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 0;
  overflow: hidden;
}

.hero-wave,
.hero-particles {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-canvas);
  pointer-events: none;
}

.hero-wave {
  opacity: 0.55;
  -webkit-mask-image: linear-gradient(180deg, transparent 4%, #000 32%, #000 72%, transparent 98%);
  mask-image: linear-gradient(180deg, transparent 4%, #000 32%, #000 72%, transparent 98%);
}

.hero-particles {
  opacity: 0.85;
}

/* CSS 科技网格线（视差层，仅桌面启用位移） */
.hero-grid {
  position: absolute;
  inset: -20% 0;
  z-index: 0;
  background-image:
    linear-gradient(color-mix(in srgb, var(--c-cyan) 5%, transparent) 1px, transparent 1px),
    linear-gradient(90deg, color-mix(in srgb, var(--c-cyan) 5%, transparent) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(70% 60% at 50% 42%, #000 25%, transparent 75%);
  mask-image: radial-gradient(70% 60% at 50% 42%, #000 25%, transparent 75%);
  will-change: transform;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 2;
  padding-top: calc(var(--nav-h) + 48px);
  padding-bottom: 96px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.84rem;
  letter-spacing: 0.2em;
  color: var(--text-sub);
  margin-bottom: var(--space-32);
}

.hero-eyebrow .dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--grad-brand);
  box-shadow: var(--glow-cyan-sm);
  animation: dotPulse 2.4s ease-in-out infinite;
}

@keyframes dotPulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.35;
  }
}

.hero-title {
  font-size: clamp(3.2rem, 9vw, 6.4rem);
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.15;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  filter: drop-shadow(0 0 34px color-mix(in srgb, var(--c-cyan) 35%, transparent));
}

.hero-title-en {
  margin-top: var(--space-24);
  font-family: var(--font-mono);
  font-size: clamp(0.7rem, 1.5vw, 0.92rem);
  letter-spacing: 0.22em;
  color: var(--text-sub);
}

.hero-sub {
  margin-top: var(--space-32);
  max-width: 640px;
  font-size: 1.04rem;
  color: var(--text-sub);
}

/* 感知 → 认知 → 行动 */
.hero-verbs {
  margin-top: var(--space-64);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  width: 100%;
  max-width: 980px;
}

.hero-verbs li {
  position: relative;
  padding: 26px 20px 22px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  background: var(--glass-bg);
  transition: border-color 0.3s, box-shadow 0.3s;
}

.hero-verbs li:hover {
  border-color: color-mix(in srgb, var(--c-cyan) 42%, transparent);
  box-shadow: var(--glow-cyan-sm);
}

.verb-no {
  position: absolute;
  top: -11px;
  left: 50%;
  transform: translateX(-50%);
  padding: 0 10px;
  background: var(--bg-deep);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--c-cyan);
}

.verb-cn {
  display: block;
  font-size: 1.3rem;
  font-weight: 700;
}

.verb-en {
  display: block;
  margin: 6px 0 10px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.3em;
  color: var(--c-purple);
}

.verb-desc {
  font-size: 0.88rem;
  color: var(--text-sub);
}

.hero-cta {
  margin-top: var(--space-48);
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
}

/* ======================== 技术闭环 ======================== */
.loop-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

/* 每步的主色：青 → 紫逐级渐变 */
.loop-step:nth-child(1) {
  --step-c: #00e5ff;
}
.loop-step:nth-child(2) {
  --step-c: #7fa9ff;
}
.loop-step:nth-child(3) {
  --step-c: #9f8fff;
}
.loop-step:nth-child(4) {
  --step-c: #b26bff;
}

.loop-step {
  position: relative;
  padding: 28px 24px;
}

.loop-step:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--step-c) 45%, transparent);
  box-shadow: 0 0 24px color-mix(in srgb, var(--step-c) 18%, transparent);
}

/* 步骤间连接线（生长在进入视口时由 CSS 呈现） */
.loop-step::after {
  content: "";
  position: absolute;
  top: 50%;
  right: -24px;
  width: 24px;
  height: 1px;
  background: linear-gradient(90deg, var(--step-c), transparent);
  opacity: 0.7;
}

.loop-step:nth-child(4)::after {
  display: none;
}

.step-no {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.24em;
  color: var(--step-c);
}

.loop-step h3 {
  font-size: 1.25rem;
  margin-bottom: 10px;
}

.step-text {
  font-size: 0.92rem;
  color: var(--text-sub);
}

.step-badge {
  display: inline-block;
  margin-top: 16px;
  padding: 5px 12px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  color: var(--step-c);
  border: 1px solid color-mix(in srgb, var(--step-c) 30%, transparent);
  background: color-mix(in srgb, var(--step-c) 10%, transparent);
}

.loop-closing {
  margin-top: var(--space-48);
  text-align: center;
  font-size: 1.14rem;
  color: var(--text-sub);
}

.loop-closing strong {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  font-weight: 700;
}

/* ======================== 三大赛道 ======================== */
.track-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.track-card {
  padding: 36px 32px;
}

.track-card:hover {
  transform: translateY(-6px);
}

.track-card:nth-child(1):hover {
  border-color: color-mix(in srgb, var(--c-cyan) 50%, transparent);
  box-shadow: var(--glow-cyan-md);
}

.track-card:nth-child(2):hover {
  border-color: color-mix(in srgb, var(--c-purple) 50%, transparent);
  box-shadow: var(--glow-purple-md);
}

.track-card:nth-child(3):hover {
  border-color: color-mix(in srgb, var(--c-cyan) 40%, transparent);
  box-shadow: var(--glow-cyan-md), var(--glow-purple-md);
}

.track-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

.track-no {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  color: var(--c-cyan);
}

.track-card:nth-child(2) .track-no {
  color: var(--c-purple);
}

.track-card:nth-child(3) .track-no {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.track-en {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.26em;
  color: var(--text-dim);
}

.track-card h3 {
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.track-card p {
  font-size: 0.94rem;
  color: var(--text-sub);
}

.track-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 20px;
}

.track-tags li {
  font-size: 0.78rem;
  padding: 4px 10px;
  border-radius: 999px;
  color: var(--c-cyan);
  border: 1px solid var(--c-cyan-soft);
  background: var(--c-cyan-faint);
}

.track-card:nth-child(2) .track-tags li {
  color: var(--c-purple);
  border-color: var(--c-purple-soft);
  background: var(--c-purple-faint);
}

.track-card:nth-child(3) .track-tags li {
  color: var(--text-sub);
  border-color: var(--glass-border);
  background: var(--glass-bg);
}

/* ======================== 硬件产品 ======================== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.product-card {
  padding: 28px;
  display: flex;
  flex-direction: column;
}

.product-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--c-cyan) 45%, transparent);
  box-shadow: var(--glow-cyan-sm);
}

.product-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 14px;
}

.product-head h3 {
  font-size: 1.12rem;
  line-height: 1.5;
}

.product-ch {
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
}

.product-desc {
  font-size: 0.92rem;
  color: var(--text-sub);
  flex: 1;
}

.product-market {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px solid var(--glass-border);
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* ======================== 核心优势数据 ======================== */
.metrics {
  background: linear-gradient(
    180deg,
    transparent,
    color-mix(in srgb, var(--c-purple) 4%, transparent),
    transparent
  );
}

.sec-head-center {
  margin-inline: auto;
  text-align: center;
}

.sec-head-center .eyebrow {
  justify-content: center;
}

.sec-head-center .eyebrow::before {
  display: none;
}

.sec-head-center .eyebrow::after {
  content: "";
  width: 28px;
  height: 1px;
  background: var(--grad-brand);
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.metric {
  padding: 40px 16px 32px;
  text-align: center;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  background: var(--glass-bg);
}

.metric-num {
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 3.6vw, 2.9rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  line-height: 1.2;
}

.metric:nth-child(odd) .metric-num {
  color: var(--c-cyan);
  text-shadow: var(--glow-cyan-sm);
}

.metric:nth-child(even) .metric-num {
  color: var(--c-purple);
  text-shadow: var(--glow-purple-sm);
}

.metric-tilde {
  opacity: 0.45;
  font-size: 0.8em;
  margin: 0 0.05em;
}

.metric-unit {
  font-size: 0.55em;
  margin-left: 0.06em;
}

.metric-label {
  margin-top: 12px;
  font-size: 0.95rem;
  color: var(--text-sub);
}

.metric-note {
  margin: var(--space-48) auto 0;
  max-width: 860px;
  text-align: center;
  font-size: 0.95rem;
  color: var(--text-sub);
}

/* ======================== 三大业务 ======================== */
.biz-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.biz-card {
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
}

.biz-tag {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  margin-bottom: 10px;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.biz-card h3 {
  font-size: 1.2rem;
  margin-bottom: 14px;
}

.biz-en {
  margin-left: 8px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.2em;
  font-weight: 400;
  color: var(--text-dim);
}

.biz-card > p {
  font-size: 0.93rem;
  color: var(--text-sub);
}

.biz-partners {
  margin-top: auto;
  padding-top: 22px;
}

.biz-partners > span {
  display: block;
  margin-bottom: 8px;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  color: var(--text-dim);
}

.biz-partners li {
  padding: 4px 0;
  font-size: 0.9rem;
  color: var(--c-cyan);
}

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

.biz-note {
  margin-top: 16px;
  font-size: 0.87rem;
  color: var(--text-dim);
}

.biz-list {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 8px;
}

.biz-list li {
  position: relative;
  padding-left: 20px;
  font-size: 0.93rem;
  color: var(--text-sub);
}

.biz-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--grad-brand);
}

/* ======================== 价值观 ======================== */
.value-list {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.value-card {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  max-width: 920px;
  padding: 36px 40px;
}

.value-card:nth-child(even) {
  margin-left: auto;
}

.value-card:hover {
  border-color: color-mix(in srgb, var(--c-purple) 40%, transparent);
  box-shadow: var(--glow-purple-sm);
}

.value-no {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.value-card h3 {
  font-size: 1.4rem;
  margin-bottom: 10px;
}

.value-card p {
  font-size: 0.95rem;
  color: var(--text-sub);
}

.value-tag {
  display: inline-block;
  margin-top: 14px;
  padding: 5px 12px;
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--c-cyan);
  border: 1px solid var(--c-cyan-soft);
  background: var(--c-cyan-faint);
}

.value-card:nth-child(even) .value-tag {
  color: var(--c-purple);
  border-color: var(--c-purple-soft);
  background: var(--c-purple-faint);
}

/* ======================== 政策与市场 ======================== */
.market-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 72px;
  align-items: center;
}

.market-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.market-stat {
  padding: 28px 20px;
  text-align: center;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  background: var(--glass-bg);
}

.market-num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.3rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.2;
}

.market-stat:nth-child(odd) .market-num {
  color: var(--c-cyan);
}

.market-stat:nth-child(even) .market-num {
  color: var(--c-purple);
}

.market-pct {
  font-size: 0.6em;
}

.market-label {
  margin-top: 8px;
  font-size: 0.82rem;
  color: var(--text-sub);
}

.market-source {
  grid-column: 1 / -1;
  text-align: center;
  font-size: 0.74rem;
  color: var(--text-dim);
}

/* ======================== 愿景 ======================== */
.vision {
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding-block: var(--space-128);
  overflow: hidden;
}

.vision-net {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: var(--z-canvas);
  opacity: 0.7;
  -webkit-mask-image: radial-gradient(75% 75% at 50% 50%, #000 40%, transparent 92%);
  mask-image: radial-gradient(75% 75% at 50% 50%, #000 40%, transparent 92%);
  pointer-events: none;
}

.vision-inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.vision-line {
  margin-top: var(--space-24);
  display: flex;
  align-items: baseline;
  justify-content: center;
  flex-wrap: wrap;
  gap: 24px;
  font-size: clamp(1.7rem, 4.6vw, 3rem);
  font-weight: 700;
  line-height: 1.4;
}

/* 逐词淡入（配合 IO 加 .in-view） */
.vision-line .w {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
  transition-delay: calc(var(--i, 0) * 0.15s);
}

.vision-line .w.in-view {
  opacity: 1;
  transform: none;
}

.vision-line .w:first-child {
  color: var(--text-sub);
  font-weight: 600;
}

.vision-line .w:last-child {
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  filter: drop-shadow(0 0 26px color-mix(in srgb, var(--c-purple) 38%, transparent));
}

.vision-arrow {
  font-size: 0.68em;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity 0.7s, transform 0.7s var(--ease-out);
  transition-delay: 0.55s;
}

.vision-arrow.in-view {
  opacity: 1;
  transform: none;
}

.vision-sub {
  margin-top: var(--space-24);
  color: var(--text-sub);
}

.vs-grid {
  margin-top: var(--space-64);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  width: 100%;
  max-width: 760px;
}

.vision-closing {
  margin-top: var(--space-64);
  font-size: 1.04rem;
  line-height: 2.1;
  color: var(--text-sub);
}

.vision-cta {
  margin-top: var(--space-48);
}

/* ======================== 响应式 ======================== */
@media (max-width: 1200px) {
  .loop-steps {
    grid-template-columns: repeat(2, 1fr);
  }
  .loop-step::after {
    display: none;
  }
}

@media (max-width: 1024px) {
  .track-grid,
  .product-grid,
  .biz-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .metric-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .market-grid {
    grid-template-columns: 1fr;
    gap: 56px;
  }
  .value-card,
  .value-card:nth-child(even) {
    max-width: none;
    margin-left: 0;
  }
  .vs-grid {
    grid-template-columns: 1fr;
    max-width: 440px;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .nav-links,
  .nav-cta {
    display: none;
  }
  .burger {
    display: flex;
  }
  section {
    padding-block: var(--space-64);
  }
  .hero-verbs {
    grid-template-columns: 1fr;
    max-width: 420px;
  }
  .loop-steps {
    grid-template-columns: 1fr;
  }
  .track-grid,
  .product-grid,
  .biz-grid {
    grid-template-columns: 1fr;
  }
  .metric-grid {
    gap: 16px;
  }
  .market-stats {
    gap: 16px;
  }
  .value-card {
    flex-direction: column;
    gap: 16px;
    padding: 28px 24px;
  }
  .h-strip {
    flex-direction: column;
    text-align: center;
    gap: 16px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .back-to-top {
    right: 16px;
    bottom: 16px;
  }
}

@media (max-width: 480px) {
  .container {
    width: calc(100% - 32px);
  }
  .hero-title {
    letter-spacing: 0.04em;
  }
  .hero-cta {
    flex-direction: column;
    width: 100%;
    max-width: 320px;
  }
  .hero-cta .btn {
    width: 100%;
  }
  .metric-grid {
    grid-template-columns: 1fr;
  }
  .vision-line {
    flex-direction: column;
    gap: 10px;
  }
  .vision-arrow {
    transform: rotate(90deg);
  }
  .vision-arrow.in-view {
    transform: rotate(90deg);
  }
  .scroll-hint {
    display: none;
  }
}