/* ============================================================
   组件与构成层
   ============================================================ */

/* ---------- 自定义光标 ---------- */
.cursor-dot {
  position: fixed;
  top: 0; left: 0;
  width: 6px; height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  pointer-events: none;
  z-index: 1000;
  transform: translate(-50%, -50%);
}
.cursor-ring {
  position: fixed;
  top: 0; left: 0;
  width: 36px; height: 36px;
  border: 1px solid rgba(230, 51, 41, 0.65);
  border-radius: 50%;
  pointer-events: none;
  z-index: 999;
  transform: translate(-50%, -50%);
  display: grid;
  place-items: center;
  transition: width var(--dur-fast) var(--ease-out),
              height var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out);
}
.cursor-ring.is-active {
  width: 72px; height: 72px;
  background: rgba(230, 51, 41, 0.92);
  border-color: transparent;
  mix-blend-mode: normal;
}
.cursor-label {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-text);
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out);
  white-space: nowrap;
}
.cursor-ring.is-active .cursor-label { opacity: 1; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 44px;
  padding: 10px 22px;
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.06em;
  border: 1px solid transparent;
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out);
  will-change: transform;
}
.btn-lg { padding: 16px 32px; font-size: var(--text-base); min-height: 56px; }
.btn-solid {
  background: var(--color-accent);
  color: var(--color-text);
  box-shadow: var(--shadow-accent);
}
.btn-solid:hover { background: #f04438; }
.btn-solid:active { transform: scale(0.97); }
.btn-ghost {
  border-color: var(--color-border-strong);
  color: var(--color-text);
}
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn-arrow { transition: transform var(--dur-fast) var(--ease-out); }
.btn:hover .btn-arrow { transform: translateX(4px); }

/* ---------- 导航 ---------- */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: background var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              backdrop-filter var(--dur-base) var(--ease-out);
}
.site-header.is-scrolled {
  background: rgba(10, 9, 8, 0.82);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--color-border);
}
.header-inner {
  max-width: var(--container);
  margin: 0 auto;
  height: var(--nav-h);
  padding: 0 var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}
.brand { display: inline-flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 14px; height: 14px;
  background: var(--color-accent);
  transform: rotate(45deg);
  box-shadow: 0 0 18px rgba(230, 51, 41, 0.8);
}
.brand-name { font-weight: 900; font-size: var(--text-lg); letter-spacing: 0.04em; }
.brand-name em {
  font-style: normal;
  font-size: var(--text-xs);
  color: var(--color-accent);
  margin-left: 6px;
  vertical-align: 2px;
}
.main-nav { display: flex; gap: var(--space-5); }
.main-nav a {
  position: relative;
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-muted);
  padding: 10px 2px;
  transition: color var(--dur-fast) var(--ease-out);
}
.main-nav a::after {
  content: "";
  position: absolute;
  left: 0; bottom: 2px;
  width: 100%; height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-base) var(--ease-out);
}
.main-nav a:hover { color: var(--color-text); }
.main-nav a:hover::after { transform: scaleX(1); }
.header-actions { display: flex; align-items: center; gap: var(--space-4); }
/* 电话：红色胶囊按钮（参考客户提供的样式） */
.header-tel {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: var(--text-base);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: #fff;
  background: var(--color-accent);
  padding: 12px 22px;
  border-radius: 999px;
  box-shadow: 0 6px 20px rgba(230, 51, 41, 0.32);
  transition: background var(--dur-fast) var(--ease-out),
              transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
}
.header-tel:hover {
  background: #f04438;
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 10px 26px rgba(230, 51, 41, 0.42);
}

/* ---------- 侧边悬浮联系栏 ---------- */
.side-dock {
  position: fixed;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sd-item {
  position: relative;
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border: 1px solid var(--color-border-strong);
  background: rgba(10, 9, 8, 0.85);
  backdrop-filter: blur(8px);
  color: var(--color-text);
  text-decoration: none;
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out),
              background var(--dur-fast) var(--ease-out);
}
.sd-item:hover,
.sd-item:focus-visible {
  border-color: var(--color-accent);
  color: var(--color-accent);
  background: rgba(10, 9, 8, 0.95);
}
.sd-ico { font-weight: 900; font-size: 15px; letter-spacing: 0.05em; }
.sd-tip {
  position: absolute;
  right: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%);
  white-space: nowrap;
  background: var(--color-accent);
  color: #fff;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.04em;
  padding: 7px 14px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-fast) var(--ease-out), visibility 0s linear var(--dur-fast);
}
.sd-item:hover .sd-tip,
.sd-item:focus-visible .sd-tip {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--dur-fast) var(--ease-out), visibility 0s linear 0s;
}
.sd-wechat .sd-pop {
  position: absolute;
  right: calc(100% + 12px);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  background: var(--color-surface);
  border: 1px solid var(--color-border-strong);
  padding: 12px;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--dur-fast) var(--ease-out), visibility 0s linear var(--dur-fast);
}
.sd-wechat:hover .sd-pop,
.sd-wechat:focus-visible .sd-pop {
  opacity: 1;
  visibility: visible;
  transition: opacity var(--dur-fast) var(--ease-out), visibility 0s linear 0s;
}
.sd-pop em {
  font-style: normal;
  font-size: var(--text-xs);
  color: var(--color-muted);
}
@media (max-width: 900px) {
  .side-dock { display: none; }
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 7px;
  width: 44px; height: 44px;
  align-items: center;
}
.nav-toggle span {
  display: block;
  width: 24px; height: 2px;
  background: var(--color-text);
  transition: transform var(--dur-base) var(--ease-out), opacity var(--dur-base);
}
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4.5px) rotate(-45deg); }

.mobile-nav {
  display: none;
  flex-direction: column;
  padding: var(--space-4) var(--gutter) var(--space-5);
  gap: var(--space-2);
  background: rgba(10, 9, 8, 0.96);
  border-bottom: 1px solid var(--color-border);
}
.mobile-nav a { padding: 14px 0; font-size: var(--text-lg); font-weight: 700; border-bottom: 1px solid var(--color-border); }
.mobile-nav .mobile-cta { color: var(--color-accent); border-bottom: 0; }
.site-header.nav-open .mobile-nav { display: flex; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}
/* 视频背景替换说明：将 canvas 换成
   <video autoplay muted loop playsinline poster="..."><source src="hero.mp4"></video>
   样式沿用 .hero-canvas 的绝对定位即可，object-fit: cover 需另加。 */
.hero-scanline {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(
    to bottom,
    transparent 0 3px,
    rgba(0, 0, 0, 0.18) 3px 4px
  );
  mix-blend-mode: multiply;
}
.hero-vignette {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(to right, rgba(10, 9, 8, 0.88) 0%, rgba(10, 9, 8, 0.35) 55%, rgba(10, 9, 8, 0.15) 100%),
    linear-gradient(to top, var(--color-bg) 0%, transparent 22%);
}
.hero-inner {
  position: relative;
  z-index: 2;
  max-width: var(--container);
  width: 100%;
  margin: 0 auto;
  padding: calc(var(--nav-h) + var(--space-6)) var(--gutter) var(--space-7);
}
.hero-eyebrow { margin-bottom: var(--space-5); }
.hero-title {
  font-size: var(--text-mega);
  letter-spacing: 0.01em;
  line-height: 1.02;
  margin-bottom: var(--space-5);
}
.hero-line { display: block; }
.hero-accent {
  font-style: normal;
  color: var(--color-accent);
  position: relative;
  text-shadow: 0 0 42px rgba(230, 51, 41, 0.45);
}
.hero-dot { color: var(--color-accent); }
.hero-sub {
  max-width: 34em;
  color: var(--color-muted);
  font-size: var(--text-lg);
  margin-bottom: var(--space-5);
}
.hero-cta { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-bottom: var(--space-7); }

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(24px, 5vw, 72px);
  border-top: 1px solid var(--color-border);
  padding-top: var(--space-4);
}
.hero-stats dt {
  font-size: var(--text-3xl);
  color: var(--color-text);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.hero-stats dd { color: var(--color-muted); font-size: var(--text-sm); margin-top: 6px; }

.hero-scrollcue {
  position: absolute;
  right: var(--gutter);
  bottom: var(--space-5);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}
.scrollcue-line {
  width: 1px; height: 56px;
  background: linear-gradient(to bottom, var(--color-accent), transparent);
  animation: cue-drop 1.8s var(--ease-inout) infinite;
  transform-origin: top;
}
@keyframes cue-drop {
  0% { transform: scaleY(0); }
  45% { transform: scaleY(1); }
  100% { transform: scaleY(1); opacity: 0; }
}

/* ---------- 区块通用 ---------- */
.section {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-8) var(--gutter);
}
.section-head { margin-bottom: var(--space-6); max-width: 720px; }
.section-title {
  font-size: var(--text-huge);
  margin-top: var(--space-3);
}
.section-title .accent, .cta-title .accent {
  font-style: normal;
  color: var(--color-accent);
}
.section-lead { color: var(--color-muted); margin-top: var(--space-3); }

/* ---------- 短视频四平台 ---------- */
.platform-row {
  display: flex;
  gap: var(--space-3);
  height: 420px;
}
.platform {
  flex: 1;
  position: relative;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: flex-start;
  padding: var(--space-4);
  text-align: left;
  overflow: hidden;
  transition: flex var(--dur-slow) var(--ease-out),
              background var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out);
}
.platform::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(230, 51, 41, 0.22), transparent 60%);
  opacity: 0;
  transition: opacity var(--dur-slow) var(--ease-out);
}
.platform-name {
  font-family: var(--font-cn-heavy);
  font-weight: 900;
  font-size: var(--text-3xl);
  position: relative;
  z-index: 1;
  transition: color var(--dur-base);
}
.platform-detail {
  position: relative;
  z-index: 1;
  color: var(--color-muted);
  font-size: var(--text-sm);
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transform: translateY(12px);
  transition: max-height var(--dur-slow) var(--ease-out),
              opacity var(--dur-base) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.platform.is-active, .platform:hover {
  flex: 2.6;
  background: var(--color-surface-2);
  border-color: var(--color-accent);
}
.platform.is-active::before, .platform:hover::before { opacity: 1; }
.platform.is-active .platform-name, .platform:hover .platform-name { color: var(--color-accent); }
.platform.is-active .platform-detail, .platform:hover .platform-detail {
  max-height: 120px;
  opacity: 1;
  transform: none;
  margin-top: var(--space-3);
}

/* ---------- 数据实力 ---------- */
.cases { border-top: 1px solid var(--color-border); }
.proof-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
}
.proof-item {
  border-left: 2px solid var(--color-accent);
  padding: var(--space-3) var(--space-4);
}
.proof-item dt span {
  font-size: clamp(2.6rem, 5vw, 4.4rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.proof-item dd { color: var(--color-muted); font-size: var(--text-sm); margin-top: var(--space-2); }

/* ---------- 流程 ---------- */
.process-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-3);
  counter-reset: step;
}
.process-step {
  position: relative;
  border: 1px solid var(--color-border);
  padding: var(--space-5) var(--space-4);
  background: var(--color-surface);
  transition: transform var(--dur-base) var(--ease-out),
              border-color var(--dur-base) var(--ease-out),
              background var(--dur-base) var(--ease-out);
}
.process-step:hover {
  transform: translateY(-6px);
  border-color: var(--color-accent);
  background: var(--color-surface-2);
}
.process-no {
  font-size: var(--text-3xl);
  color: var(--color-faint);
  display: block;
  margin-bottom: var(--space-4);
  transition: color var(--dur-base);
}
.process-step:hover .process-no { color: var(--color-accent); }
.process-step h3 { font-size: var(--text-xl); margin-bottom: var(--space-2); }
.process-step p { color: var(--color-muted); font-size: var(--text-sm); }

/* ---------- CTA ---------- */
.cta { text-align: center; }
.cta-inner {
  border: 1px solid var(--color-border-strong);
  padding: var(--space-8) var(--gutter);
  background:
    radial-gradient(40rem 24rem at 50% 120%, rgba(230, 51, 41, 0.2), transparent 65%),
    var(--color-surface);
}
.cta-title { font-size: var(--text-huge); margin: var(--space-3) 0; }
.cta-sub { color: var(--color-muted); max-width: 32em; margin: 0 auto var(--space-5); }
.cta-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); justify-content: center; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}
.footer-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-7) var(--gutter) var(--space-6);
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-6);
}
.footer-brand { display: flex; flex-direction: column; gap: var(--space-3); align-items: flex-start; }
.footer-name { font-weight: 900; font-size: var(--text-xl); }
.footer-name em { font-style: normal; color: var(--color-accent); font-size: var(--text-sm); margin-left: 6px; }
.footer-desc { color: var(--color-muted); font-size: var(--text-sm); }
.footer-col { display: flex; flex-direction: column; gap: 10px; }
.footer-col .mono-tag { margin-bottom: 6px; }
.footer-col a { color: var(--color-muted); font-size: var(--text-sm); width: fit-content; transition: color var(--dur-fast); }
.footer-col a:hover { color: var(--color-accent); }
.footer-addr { color: var(--color-faint); font-size: var(--text-sm); }
.footer-bottom {
  max-width: var(--container);
  margin: 0 auto;
  padding: var(--space-4) var(--gutter);
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  color: var(--color-faint);
  font-size: var(--text-xs);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
  .proof-grid, .process-list { grid-template-columns: repeat(2, 1fr); }
  .main-nav, .header-tel { display: none; }
  .nav-toggle { display: flex; }
}

@media (max-width: 768px) {
  .hero-stats { gap: var(--space-4) var(--space-5); }
  .hero-stats dt { font-size: var(--text-2xl); }
  .platform-row { flex-direction: column; height: auto; }
  .platform { min-height: 120px; }
  .platform.is-active, .platform:hover { flex: 1; }
  .platform.is-active .platform-detail, .platform:hover .platform-detail { max-height: 200px; }
  .proof-grid, .process-list { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: var(--space-5); }
  .hero-scrollcue { display: none; }
  .header-actions .btn { display: none; }
}