/* 无尽冬日工具集 · 主站（整页翻页式）
 * 纯静态、无外部依赖；整页滚动吸附，一屏一个栏目。
 */

:root {
  color-scheme: light;

  --brand: #2563eb;
  --brand-dark: #1d4ed8;
  --brand-light: #60a5fa;
  --brand-soft: #eff5ff;
  --brand-line: #dbe7ff;

  --ink: #0b1220;
  --ink-soft: #1f2937;
  --text: #374151;
  --text-soft: #4b5563;
  --text-muted: #6b7280;
  --text-faint: #9ca3af;

  --bg: #ffffff;
  --bg-alt: #f6f8fc;
  --surface: #ffffff;
  --border: #e6eaf2;
  --border-strong: #d8dfeb;

  --radius-lg: 20px;
  --radius: 14px;
  --radius-sm: 10px;

  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow: 0 12px 32px rgba(15, 23, 42, 0.07);
  --shadow-lg: 0 28px 70px rgba(15, 23, 42, 0.14);

  --shell: 1180px;
  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-snap-type: y mandatory;
  -webkit-text-size-adjust: 100%;
}

/* 翻页动画期间临时关掉吸附，避免浏览器在动画中途强行对齐 */
html.is-paging {
  scroll-snap-type: none;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  color: var(--ink);
  line-height: 1.25;
  letter-spacing: -0.015em;
}

p {
  margin: 0;
}

a {
  color: inherit;
  text-decoration: none;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 24px;
}

.shell.narrow {
  max-width: 840px;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease,
    border-color 0.18s ease, color 0.18s ease;
}

.btn-primary {
  background: linear-gradient(180deg, #3b82f6, var(--brand));
  color: #fff;
  box-shadow: 0 10px 24px rgba(37, 99, 235, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 30px rgba(37, 99, 235, 0.34), inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

.btn-outline {
  border-color: rgba(255, 255, 255, 0.28);
  color: #e8eefc;
  background: rgba(255, 255, 255, 0.04);
}

.btn-outline:hover {
  border-color: rgba(255, 255, 255, 0.5);
  background: rgba(255, 255, 255, 0.1);
}

.btn-light {
  height: 36px;
  padding: 0 16px;
  font-size: 13.5px;
  color: #0b1220;
  background: #fff;
}

.btn-light:hover {
  background: #eaf1ff;
  color: var(--brand-dark);
}

.btn-lg {
  height: 52px;
  padding: 0 30px;
  font-size: 16px;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  background: rgba(11, 18, 32, 0.9);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  backdrop-filter: saturate(160%) blur(16px);
  -webkit-backdrop-filter: saturate(160%) blur(16px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  color: #fff;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  flex: none;
  border-radius: 10px;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-light));
  box-shadow: 0 8px 20px rgba(37, 99, 235, 0.35);
}

.brand-mark svg {
  width: 24px;
  height: 24px;
}

.brand-mark.small {
  width: 30px;
  height: 30px;
  border-radius: 8px;
}

.brand-mark.small svg {
  width: 20px;
  height: 20px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand-text strong {
  font-size: 14.5px;
  letter-spacing: 0.01em;
}

.brand-text small {
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.16em;
  color: rgba(232, 238, 252, 0.55);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 26px;
}

.site-nav a {
  font-size: 14px;
  color: rgba(232, 238, 252, 0.76);
  transition: color 0.16s ease;
}

.site-nav a:hover,
.site-nav a.is-current {
  color: #fff;
}

.site-nav a.nav-cta {
  margin-left: 4px;
  color: #0b1220;
}

.site-nav a.nav-cta:hover {
  color: var(--brand-dark);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 4px;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.05);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 1.6px;
  border-radius: 2px;
  background: #fff;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(5.6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-5.6px) rotate(-45deg);
}

/* ---------- 右侧页面点导航 ---------- */
.page-nav {
  position: fixed;
  top: 50%;
  right: 20px;
  z-index: 55;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 9px 7px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(15, 23, 42, 0.06);
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.12);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transform: translateY(-50%);
}

.page-dot {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
}

.page-dot i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #cbd5e1;
  transition: background-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.page-dot:hover i {
  background: #94a3b8;
}

.page-dot.is-active i {
  background: var(--brand);
  box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.16);
  transform: scale(1.1);
}

.page-dot span {
  position: absolute;
  right: 34px;
  padding: 3px 9px;
  border-radius: 7px;
  font-size: 12px;
  white-space: nowrap;
  color: #fff;
  background: rgba(11, 18, 32, 0.86);
  opacity: 0;
  transform: translateX(4px);
  pointer-events: none;
  transition: opacity 0.16s ease, transform 0.16s ease;
}

.page-dot:hover span {
  opacity: 1;
  transform: none;
}

.page-dot.is-active span {
  opacity: 1;
  transform: none;
  background: var(--brand);
}

/* ---------- 左下页码 ---------- */
.page-index {
  position: fixed;
  left: 22px;
  bottom: 22px;
  z-index: 55;
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 12px;
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 11px;
  color: #64748b;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(15, 23, 42, 0.06);
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.page-index-now {
  color: var(--brand-dark);
  font-weight: 700;
}

.page-index-line {
  position: relative;
  display: block;
  width: 46px;
  height: 2px;
  border-radius: 2px;
  background: #e2e8f0;
  overflow: hidden;
}

.page-index-line i {
  position: absolute;
  inset: 0 auto 0 0;
  display: block;
  width: 16.6%;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--brand-light));
  transition: width 0.35s ease;
}

/* ---------- 整页 ---------- */
.page {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100vh;
  min-height: 100svh;
  padding: 92px 0 56px;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  overflow: hidden;
}

.page-alt {
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.page-inner {
  width: 100%;
}

/* 入场动画：仅当前页激活时播放 */
.js .page .anim {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.9s ease, transform 0.95s cubic-bezier(0.22, 0.61, 0.36, 1);
}

.js .page.is-active .anim,
.js .page.is-seen .anim {
  opacity: 1;
  transform: none;
}

/* ---------- Hero ---------- */
.page-hero {
  background: radial-gradient(120% 90% at 78% -10%, #1b3a7a 0%, #0f1d3a 42%, #080e1c 100%);
  color: #dbe4f6;
}

.hero-glow {
  position: absolute;
  inset: -20% -10% auto auto;
  width: 720px;
  height: 720px;
  pointer-events: none;
  filter: blur(8px);
  background: radial-gradient(closest-side, rgba(96, 165, 250, 0.34), transparent 72%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(120% 80% at 50% 0%, #000 25%, transparent 78%);
  -webkit-mask-image: radial-gradient(120% 80% at 50% 0%, #000 25%, transparent 78%);
}

.hero-inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  gap: 60px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 16px;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(147, 197, 253, 0.95);
}

.eyebrow .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: #38bdf8;
  box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.18);
}

.hero h1 {
  font-size: clamp(30px, 4.2vw, 48px);
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.03em;
}

.grad-text {
  display: inline-block;
  color: transparent;
  background: linear-gradient(96deg, #93c5fd, #60a5fa 40%, #a5b4fc 90%);
  -webkit-background-clip: text;
  background-clip: text;
}

.lede {
  max-width: 540px;
  margin-top: 20px;
  font-size: 16px;
  color: rgba(203, 213, 225, 0.92);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.hero-stats {
  display: flex;
  gap: 40px;
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero-stats li {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.hero-stats strong {
  font-size: 23px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}

.hero-stats span {
  font-size: 12.5px;
  color: rgba(203, 213, 225, 0.72);
}

.hero-visual {
  position: relative;
  padding: 12px 8px;
}

.panel {
  position: relative;
  padding: 20px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.985), rgba(248, 250, 255, 0.97));
  box-shadow: var(--shadow-lg), 0 0 0 1px rgba(255, 255, 255, 0.5) inset;
  transform: perspective(1200px) rotateY(-4deg) rotateX(1.6deg);
  transition: transform 0.5s cubic-bezier(0.2, 0.7, 0.2, 1);
}

.hero-visual:hover .panel {
  transform: perspective(1200px) rotateY(0) rotateX(0);
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 13px;
  border-bottom: 1px solid var(--border);
}

.panel-title {
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 23px;
  padding: 0 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--text-soft);
  background: #f1f5f9;
  border: 1px solid var(--border);
}

.pill-ok {
  color: #15803d;
  background: #ecfdf3;
  border-color: #bbf7d0;
}

.pill-beta {
  color: #b45309;
  background: #fffbeb;
  border-color: #fde68a;
}

.pill-live {
  color: #15803d;
  background: #ecfdf3;
  border-color: #bbf7d0;
}

.pill-live i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #22c55e;
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.16);
}

.who {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 0 13px;
}

.avatar {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  flex: none;
  border-radius: 11px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), #7c3aed);
}

.who-meta {
  display: flex;
  flex-direction: column;
  min-width: 0;
  line-height: 1.4;
}

.who-meta strong {
  font-size: 15px;
  color: var(--ink);
}

.who-meta span {
  font-size: 12px;
  color: var(--text-muted);
}

.power {
  margin-left: auto;
  text-align: right;
  line-height: 1.3;
}

.power span {
  display: block;
  font-size: 11px;
  color: var(--text-faint);
}

.power strong {
  font-size: 16px;
  color: var(--brand-dark);
  font-variant-numeric: tabular-nums;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding-bottom: 14px;
}

.chip {
  padding: 2px 8px;
  border-radius: 7px;
  font-size: 11.5px;
  color: var(--text-soft);
  background: #f6f8fc;
  border: 1px solid var(--border);
}

.chip-warn {
  color: #b45309;
  background: #fffbeb;
  border-color: #fde68a;
}

.queue {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 13px;
  border-radius: var(--radius);
  background: #f8fafc;
  border: 1px solid var(--border);
}

.queue-row {
  display: flex;
  align-items: center;
  gap: 9px;
}

.q-tag {
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 11px;
  font-weight: 600;
  white-space: nowrap;
}

.q-gather {
  color: #0f766e;
  background: #ccfbf1;
}

.q-march {
  color: #1d4ed8;
  background: #dbeafe;
}

.q-hold {
  color: #7c2d12;
  background: #ffedd5;
}

.q-line {
  flex: 1;
  height: 6px;
  border-radius: 999px;
  background: linear-gradient(90deg, #dbe7ff, #eef2f9);
}

.q-line.short {
  max-width: 46%;
}

.q-meta {
  font-size: 11px;
  color: var(--text-faint);
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

.float-card {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 13px;
  border-radius: 11px;
  font-size: 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 14px 34px rgba(2, 8, 23, 0.28);
}

.float-1 {
  right: 0;
  bottom: -24px;
  flex-direction: column;
  align-items: flex-start;
  gap: 0;
  padding: 11px 16px;
}

.fc-num {
  font-size: 21px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--brand-dark);
  font-variant-numeric: tabular-nums;
}

.fc-label {
  font-size: 11px;
  color: var(--text-muted);
  white-space: nowrap;
}

.float-2 {
  bottom: -18px;
  left: -12px;
  color: #15803d;
}

.float-2 svg {
  width: 15px;
  height: 15px;
}

.float-2 .fc-label {
  color: var(--ink-soft);
}

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 20px;
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: rgba(203, 213, 225, 0.7);
  transform: translateX(-50%);
  transition: color 0.2s ease;
}

.scroll-hint:hover {
  color: #fff;
}

.scroll-hint svg {
  width: 18px;
  height: 18px;
  animation: bounce 1.8s ease-in-out infinite;
}

@keyframes bounce {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(5px);
  }
}

/* ---------- 区块标题 ---------- */
.section-head {
  max-width: 760px;
  margin-bottom: 38px;
}

.section-head .eyebrow {
  margin-bottom: 10px;
  color: var(--brand);
}

.section-head h2 {
  font-size: clamp(23px, 2.6vw, 32px);
  font-weight: 700;
}

.section-sub {
  margin-top: 12px;
  font-size: 14.5px;
  color: var(--text-soft);
}

/* ---------- 产品卡片 ---------- */
.cards {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 20px 22px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.24s cubic-bezier(0.2, 0.7, 0.2, 1), box-shadow 0.24s ease,
    border-color 0.24s ease;
}

.card:hover {
  transform: translateY(-8px);
  border-color: var(--brand-line);
  box-shadow: 0 24px 52px rgba(15, 23, 42, 0.14), 0 2px 6px rgba(15, 23, 42, 0.05);
}

.card-feature {
  background: linear-gradient(170deg, #ffffff 0%, #f5f9ff 100%);
  border-color: var(--brand-line);
}

a.card-link {
  color: inherit;
  cursor: pointer;
}

a.card-link:focus-visible {
  outline: 2px solid var(--brand);
  outline-offset: 3px;
}

.card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  color: var(--brand-dark);
  background: var(--brand-soft);
  border: 1px solid var(--brand-line);
}

.icon svg {
  width: 20px;
  height: 20px;
}

.icon-brand {
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-light));
  border-color: transparent;
  box-shadow: 0 10px 22px rgba(37, 99, 235, 0.26);
}

.card h3 {
  font-size: 17px;
  font-weight: 700;
}

.card-desc {
  margin-top: 8px;
  font-size: 13.2px;
  line-height: 1.72;
  color: var(--text-soft);
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 12px;
}

.card-tags span {
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 11px;
  color: var(--brand-dark);
  background: var(--brand-soft);
  border: 1px solid var(--brand-line);
}

.card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: auto;
  padding-top: 12px;
  font-size: 11.5px;
  color: var(--text-faint);
  border-top: 1px dashed var(--border);
}

.card-go {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-weight: 600;
  color: var(--brand);
  white-space: nowrap;
}

.card-go svg {
  width: 13px;
  height: 13px;
  transition: transform 0.2s ease;
}

a.card-link:hover .card-go svg {
  transform: translate(2px, -2px);
}

/* ---------- 能力 ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--border);
  border: 1px solid var(--border);
}

.feature {
  padding: 32px 30px;
  background: #fff;
}

.feature h3 {
  font-size: 16px;
  font-weight: 700;
}

.feature h3::before {
  content: "";
  display: block;
  width: 24px;
  height: 3px;
  margin-bottom: 12px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--brand), var(--brand-light));
}

.feature p {
  margin-top: 8px;
  font-size: 13.8px;
  color: var(--text-soft);
}

/* ---------- 流程 ---------- */
.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}

.step {
  position: relative;
  padding: 24px 22px;
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.step-no {
  display: inline-block;
  margin-bottom: 14px;
  padding: 2px 8px;
  border-radius: 7px;
  font-family: var(--mono);
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--brand);
  background: var(--brand-soft);
}

.step h3 {
  font-size: 16px;
  font-weight: 700;
}

.step p {
  margin-top: 8px;
  font-size: 13.5px;
  color: var(--text-soft);
}

/* ---------- FAQ ---------- */
.faq {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.faq details {
  padding: 2px 20px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--border);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.faq details[open] {
  border-color: var(--brand-line);
  box-shadow: var(--shadow-sm);
}

.faq summary {
  position: relative;
  padding: 15px 30px 15px 0;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  list-style: none;
  cursor: pointer;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::after {
  content: "";
  position: absolute;
  top: 50%;
  right: 2px;
  width: 9px;
  height: 9px;
  border-right: 1.8px solid var(--text-muted);
  border-bottom: 1.8px solid var(--text-muted);
  transform: translateY(-70%) rotate(45deg);
  transition: transform 0.2s ease;
}

.faq details[open] summary::after {
  transform: translateY(-30%) rotate(-135deg);
}

.faq p {
  padding: 13px 0 16px;
  font-size: 13.8px;
  color: var(--text-soft);
  border-top: 1px solid var(--border);
}

/* ---------- 最后一页：CTA + 免责声明 + 页脚 ---------- */
.page-closing {
  background: radial-gradient(120% 120% at 85% 0%, #16294d 0%, #0b1220 55%, #070d18 100%);
  color: #cbd5e1;
}

.closing-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
  gap: 44px;
  align-items: center;
}

.closing-cta h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  color: #fff;
}

.closing-sub {
  margin-top: 12px;
  font-size: 15px;
  color: rgba(203, 213, 225, 0.85);
}

.closing-cta .btn {
  margin-top: 26px;
}

.disclaimer-card {
  padding: 26px 28px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 24px 60px rgba(2, 8, 23, 0.35);
}

.disclaimer-head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}

.disclaimer-head h3 {
  font-size: 15.5px;
  font-weight: 700;
}

.disclaimer-badge {
  display: inline-flex;
  align-items: center;
  height: 22px;
  padding: 0 9px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 600;
  color: #b45309;
  background: #fffbeb;
  border: 1px solid #fde68a;
}

.disclaimer-list {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.disclaimer-list li {
  position: relative;
  padding-left: 14px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-muted);
}

.disclaimer-list li::before {
  content: "";
  position: absolute;
  top: 9px;
  left: 2px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--border-strong);
}

.site-footer {
  margin-top: 34px;
  padding-top: 18px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.footer-brand strong {
  font-size: 14px;
  color: #fff;
}

.footer-brand p {
  margin-top: 3px;
  font-size: 12.5px;
  color: rgba(148, 163, 184, 0.9);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
}

.footer-links a {
  font-size: 12.5px;
  color: rgba(148, 163, 184, 0.92);
  transition: color 0.16s ease;
}

.footer-links a:hover {
  color: #fff;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 14px;
  margin-top: 16px;
  font-size: 11.5px;
  color: rgba(100, 116, 139, 0.95);
}


/* ---------- 上手流程：双栏 + 纵向时间线 ---------- */
.workflow-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  gap: 64px;
  align-items: center;
}

.workflow-copy h2 {
  font-size: clamp(26px, 3vw, 36px);
  font-weight: 700;
}

.workflow-copy .section-sub {
  margin: 12px 0 26px;
}

.steps-vertical {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.steps-vertical::before {
  content: "";
  position: absolute;
  top: 26px;
  bottom: 26px;
  left: 35px;
  width: 1px;
  background: linear-gradient(180deg, var(--brand-line), var(--border));
}

.steps-vertical .step {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 16px 20px;
  z-index: 1;
}

.steps-vertical .step-no {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  flex: none;
  margin: 0;
  padding: 0;
  border-radius: 50%;
  background: #fff;
  border: 1px solid var(--brand-line);
  color: var(--brand);
  font-size: 11px;
}

.steps-vertical .step h3 {
  font-size: 15.5px;
}

.steps-vertical .step p {
  margin-top: 3px;
  font-size: 13.2px;
}

@media (max-width: 900px) {
  .workflow-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }

  .workflow-copy .btn {
    margin-top: 4px;
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1100px) {
  .cards,
  .features {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 900px) {
  html {
    scroll-snap-type: none;
  }

  .page {
    min-height: auto;
    padding: 92px 0 64px;
  }

  .hero-inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 44px;
  }

  .hero-visual {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
  }

  .panel {
    transform: none;
  }

  .scroll-hint,
  .page-nav,
  .page-index {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 12px 24px 20px;
    background: rgba(11, 18, 32, 0.97);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(14px);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    padding: 11px 0;
    font-size: 15px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }

  .site-nav a.nav-cta {
    justify-content: center;
    margin: 12px 0 0;
    padding: 9px 0;
    border-bottom: none;
  }

  .closing-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
  }
}

@media (max-width: 680px) {
  .shell {
    padding: 0 18px;
  }

  .cards,
  .features,
  .steps {
    grid-template-columns: minmax(0, 1fr);
  }

  .features {
    gap: 12px;
    background: transparent;
    border: none;
    overflow: visible;
  }

  .feature {
    border: 1px solid var(--border);
    border-radius: var(--radius);
  }

  .hero-stats {
    flex-wrap: wrap;
    gap: 24px;
  }

  .float-card {
    display: none;
  }

  .footer-links {
    gap: 14px;
  }

  .disclaimer-card {
    padding: 22px 20px;
  }
}

/* 矮屏（常见 768/800 高）压缩一档，保证一屏装得下 */
@media (max-height: 800px) and (min-width: 901px) {
  .page {
    padding: 82px 0 36px;
  }

  .section-head {
    margin-bottom: 24px;
  }

  .section-sub {
    margin-top: 8px;
  }

  .card {
    padding: 16px 19px;
  }

  .card-top {
    margin-bottom: 10px;
  }

  .card-desc {
    font-size: 12.4px;
    line-height: 1.65;
  }

  .card-tags {
    margin-top: 9px;
  }

  .feature {
    padding: 19px 21px;
  }

  .step {
    padding: 18px 20px;
  }

  .hero-stats {
    margin-top: 26px;
    padding-top: 18px;
  }

  .guest,
  .faq summary {
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .site-footer {
    margin-top: 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }

  .js .page .anim {
    opacity: 1;
    transform: none;
  }
}