/* ============================================================================
 * Scratch Pad 官网样式
 *
 * 设计基调：对齐桌面编辑器，而非网页后台。
 * - 单一强调色（沿用应用内的主题蓝 #2383e2），不用渐变堆砌
 * - 细发丝线分层，不用大圆角 + 大阴影的卡片堆
 * - 排版靠字号与字重拉层级，靠留白分区
 * - 三态主题：跟随系统为默认，顶栏按钮可显式锁定亮/暗，选择写入 localStorage
 * ========================================================================== */

/* ---------- 设计令牌 ---------- */

/**
 * 主题策略：
 * - 默认（html 无 data-theme）：跟随系统偏好
 * - html[data-theme="light"] / [data-theme="dark"]：用户显式锁定，覆盖系统
 * - 暗色令牌写在一个共用选择器里，避免与系统分支重复维护两份值
 */
:root {
  --bg: #ffffff;
  --bg-alt: #faf9f7;
  --bg-sunken: #f4f3f0;
  --fg: #1f1f1f;
  --fg-muted: #5f5e5b;
  --fg-subtle: #8b8a86;
  --line: rgb(0 0 0 / 9%);
  --line-strong: rgb(0 0 0 / 16%);
  --accent: #2383e2;
  --accent-soft: rgb(35 131 226 / 9%);
  --accent-line: rgb(35 131 226 / 32%);
  --code-bg: #f7f6f3;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 5%), 0 2px 8px rgb(0 0 0 / 4%);
  --shadow-md: 0 4px 12px rgb(0 0 0 / 6%), 0 16px 40px rgb(0 0 0 / 8%);
  --radius: 8px;
  --radius-sm: 5px;
  --shell: 1160px;
  --font-sans: "Segoe UI Variable Text", "Segoe UI", "Microsoft YaHei UI",
    "Microsoft YaHei", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "Cascadia Code", "Cascadia Mono", "SF Mono", Consolas,
    "Microsoft YaHei UI", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #191919;
    --bg-alt: #1f1f1f;
    --bg-sunken: #242424;
    --fg: #ececec;
    --fg-muted: #a8a8a6;
    --fg-subtle: #7a7a78;
    --line: rgb(255 255 255 / 10%);
    --line-strong: rgb(255 255 255 / 18%);
    --accent: #4da3f0;
    --accent-soft: rgb(77 163 240 / 14%);
    --accent-line: rgb(77 163 240 / 38%);
    --code-bg: #252525;
    --shadow-sm: 0 1px 2px rgb(0 0 0 / 30%), 0 2px 8px rgb(0 0 0 / 24%);
    --shadow-md: 0 4px 12px rgb(0 0 0 / 36%), 0 16px 40px rgb(0 0 0 / 44%);
  }
}

/* 显式锁定暗色：与系统偏好分支取值一致 */
html[data-theme="dark"] {
  --bg: #191919;
  --bg-alt: #1f1f1f;
  --bg-sunken: #242424;
  --fg: #ececec;
  --fg-muted: #a8a8a6;
  --fg-subtle: #7a7a78;
  --line: rgb(255 255 255 / 10%);
  --line-strong: rgb(255 255 255 / 18%);
  --accent: #4da3f0;
  --accent-soft: rgb(77 163 240 / 14%);
  --accent-line: rgb(77 163 240 / 38%);
  --code-bg: #252525;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 30%), 0 2px 8px rgb(0 0 0 / 24%);
  --shadow-md: 0 4px 12px rgb(0 0 0 / 36%), 0 16px 40px rgb(0 0 0 / 44%);
}

/* 显式锁定亮色：需要压过系统的暗色媒体查询，因此取值必须再声明一次 */
html[data-theme="light"] {
  --bg: #ffffff;
  --bg-alt: #faf9f7;
  --bg-sunken: #f4f3f0;
  --fg: #1f1f1f;
  --fg-muted: #5f5e5b;
  --fg-subtle: #8b8a86;
  --line: rgb(0 0 0 / 9%);
  --line-strong: rgb(0 0 0 / 16%);
  --accent: #2383e2;
  --accent-soft: rgb(35 131 226 / 9%);
  --accent-line: rgb(35 131 226 / 32%);
  --code-bg: #f7f6f3;
  --shadow-sm: 0 1px 2px rgb(0 0 0 / 5%), 0 2px 8px rgb(0 0 0 / 4%);
  --shadow-md: 0 4px 12px rgb(0 0 0 / 6%), 0 16px 40px rgb(0 0 0 / 8%);
}

/* 主题切换只改令牌不换 DOM，避免瞬时闪烁 */
html[data-theme] body {
  transition: background-color 0.2s ease, color 0.2s ease;
}

/* ---------- 基础 ---------- */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  /* 锚点滚动时给固定顶栏留出空间 */
  scroll-padding-top: 88px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.018em;
  line-height: 1.24;
}

p {
  margin: 0;
}

ul,
ol,
dl,
dd {
  margin: 0;
  padding: 0;
}

ul,
ol {
  list-style: none;
}

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

img {
  display: block;
  max-width: 100%;
}

code,
kbd {
  font-family: var(--font-mono);
}

::selection {
  background: var(--accent-soft);
}

.shell {
  width: 100%;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 28px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 999;
  padding: 10px 16px;
  background: var(--bg);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  left: 16px;
  top: 16px;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 3px;
}

/* ---------- 顶栏 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, backdrop-filter 0.2s ease;
}

/* 滚动后才加底色：首屏顶栏与 Hero 融为一体 */
.site-header.is-stuck {
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(180%) blur(14px);
  border-bottom-color: var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 68px;
}

.brand {
  display: flex;
  flex: none;
  align-items: center;
  gap: 10px;
}

.brand-mark {
  display: grid;
  width: 32px;
  height: 32px;
  flex: none;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
}

.brand-mark svg {
  width: 19px;
  height: 19px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-size: 15px;
  font-weight: 650;
  letter-spacing: -0.01em;
}

.brand-tagline {
  font-size: 11.5px;
  color: var(--fg-subtle);
}

.site-nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
  font-size: 14px;
}

.site-nav a {
  padding: 6px 11px;
  border-radius: var(--radius-sm);
  color: var(--fg-muted);
  transition: background 0.15s ease, color 0.15s ease;
}

.site-nav a:hover {
  background: var(--bg-sunken);
  color: var(--fg);
}

.header-actions {
  display: flex;
  flex: none;
  align-items: center;
  gap: 12px;
}

/* ---------- 语言切换（滑块式分段控件） ---------- */

.lang-switch {
  position: relative;
  display: flex;
  padding: 2px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-sunken);
}

.lang-btn {
  position: relative;
  z-index: 1;
  min-width: 46px;
  padding: 5px 10px;
  border: none;
  border-radius: 999px;
  background: none;
  color: var(--fg-subtle);
  font: inherit;
  font-size: 12.5px;
  font-weight: 550;
  cursor: pointer;
  transition: color 0.18s ease;
}

.lang-btn.is-active {
  color: var(--fg);
}

.lang-thumb {
  position: absolute;
  z-index: 0;
  top: 2px;
  bottom: 2px;
  left: 2px;
  width: calc(50% - 2px);
  border-radius: 999px;
  background: var(--bg);
  box-shadow: var(--shadow-sm);
  transition: transform 0.22s cubic-bezier(0.4, 0, 0.2, 1);
}

html[data-locale="en"] .lang-thumb {
  transform: translateX(100%);
}

/* ---------- 主题切换（三态循环按钮） ---------- */

.theme-toggle {
  display: grid;
  width: 34px;
  height: 34px;
  flex: none;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
  color: var(--fg-muted);
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.theme-toggle:hover {
  border-color: var(--line-strong);
  color: var(--fg);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.theme-toggle svg {
  width: 17px;
  height: 17px;
}

/**
 * 三个图标按当前生效主题显隐。
 * data-theme 缺省时由 .theme-system 显示「跟随系统」图标。
 */
.theme-toggle .ti {
  display: none;
}

html:not([data-theme]) .theme-toggle .ti-system,
html[data-theme="light"] .theme-toggle .ti-sun,
html[data-theme="dark"] .theme-toggle .ti-moon {
  display: block;
}

/* ---------- 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  font-size: 14.5px;
  font-weight: 550;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease,
    transform 0.1s ease;
}

.btn .ico {
  width: 16px;
  height: 16px;
  flex: none;
}

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

.btn-primary {
  background: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  background: color-mix(in srgb, var(--accent) 88%, black);
}

.btn-ghost {
  border-color: var(--line);
  color: var(--fg);
}

.btn-ghost:hover {
  border-color: var(--line-strong);
  background: var(--bg-sunken);
}

.btn-outline {
  border-color: var(--line-strong);
  color: var(--fg);
}

.btn-outline:hover {
  background: var(--bg-sunken);
}

.btn-sm {
  padding: 7px 15px;
  font-size: 13.5px;
}

.btn-lg {
  padding: 13px 26px;
  font-size: 15px;
}

/* ---------- 入场动画 ---------- */

.rise {
  animation: rise 0.6s cubic-bezier(0.22, 0.61, 0.36, 1) both;
  animation-delay: var(--d, 0ms);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* 滚动进场：由 app.js 加 .in-view */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.55s ease, transform 0.55s cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

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

  .rise,
  .reveal {
    opacity: 1;
    transform: none;
    animation: none;
    transition: none;
  }
}

/* ---------- Hero ---------- */

.hero {
  position: relative;
  overflow: hidden;
  padding: 88px 0 104px;
}

/* 极淡的网格底纹，给大面积留白一点肌理，不抢内容 */
.hero::before {
  position: absolute;
  inset: 0;
  content: "";
  background-image: linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, #000 5%, transparent 72%);
  opacity: 0.72;
  pointer-events: none;
}

.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
  gap: 56px;
  align-items: center;
}

.hero-copy {
  min-width: 0;
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  padding: 5px 12px 5px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg);
  color: var(--fg-muted);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.01em;
}

.badge-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.hero-title {
  font-size: clamp(38px, 5vw, 58px);
  font-weight: 680;
  letter-spacing: -0.032em;
  line-height: 1.1;
}

.hero-title .accent {
  color: var(--accent);
}

.hero-lead {
  max-width: 30em;
  margin-top: 22px;
  color: var(--fg-muted);
  font-size: 16.5px;
  line-height: 1.75;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
}

.hero-note {
  margin-top: 18px;
  color: var(--fg-subtle);
  font-size: 13px;
}

.hero-stats {
  display: flex;
  gap: 0;
  margin-top: 44px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.stat {
  flex: 1;
  min-width: 0;
  padding-right: 20px;
}

.stat + .stat {
  padding-left: 22px;
  border-left: 1px solid var(--line);
}

.stat-value {
  font-size: 27px;
  font-weight: 650;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.stat-label {
  margin-top: 2px;
  color: var(--fg-subtle);
  font-size: 12.5px;
  line-height: 1.5;
}

/* ---------- 应用窗口实拍 ---------- */

.hero-shot {
  min-width: 0;
  margin: 0;
}

.window {
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--bg);
  box-shadow: var(--shadow-md);
}

.window-bar {
  display: flex;
  align-items: center;
  gap: 8px;
  height: 38px;
  padding: 0 10px 0 8px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--line);
}

.window-tabs {
  display: flex;
  min-width: 0;
  gap: 4px;
}

.wtab {
  display: flex;
  align-items: center;
  gap: 6px;
  height: 26px;
  padding: 0 10px;
  border-radius: var(--radius-sm);
  color: var(--fg-subtle);
  font-size: 12.5px;
  white-space: nowrap;
}

.wtab.is-active {
  background: color-mix(in srgb, var(--fg) 8%, transparent);
  color: var(--fg);
}

.wtab-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #e8b339;
}

.window-controls {
  display: flex;
  gap: 2px;
  margin-left: auto;
}

.wc {
  display: block;
  width: 30px;
  height: 22px;
  border-radius: 4px;
  /* 用居中的细横线暗示窗口按钮，避免引外部图标 */
  background: linear-gradient(currentColor, currentColor) center / 10px 1px no-repeat;
  color: var(--fg-subtle);
  opacity: 0.5;
}

.wc-close {
  color: #e81123;
  opacity: 0.75;
}

.window-body {
  position: relative;
  aspect-ratio: 1200 / 820;
  background: var(--bg);
}

/* picture 是行内元素，需要显式撑满才能让 img 的百分比高度生效 */
.window-body picture {
  display: block;
  width: 100%;
  height: 100%;
}

.window-body img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: top center;
}

/* 截图缺失时退回线框占位，页面结构不塌 */
.window-body .shot-fallback {
  display: none;
}

.window-body.is-missing picture,
.window-body.is-missing img {
  display: none;
}

.window-body.is-missing .shot-fallback {
  display: block;
  padding: 26px 30px;
}

.fb-line {
  height: 9px;
  margin-bottom: 11px;
  border-radius: 4px;
  background: var(--bg-sunken);
}

.fb-h1 {
  width: 52%;
  height: 20px;
  margin-bottom: 20px;
  background: color-mix(in srgb, var(--fg) 16%, transparent);
}

.fb-p {
  width: 92%;
}

.fb-short {
  width: 68%;
}

.fb-callout {
  height: 56px;
  margin: 18px 0;
  border-radius: 6px;
  background: var(--accent-soft);
}

.fb-code {
  height: 74px;
  border-radius: 6px;
  background: var(--code-bg);
}

.shot-caption {
  margin-top: 14px;
  color: var(--fg-subtle);
  font-size: 12.5px;
  text-align: center;
}

/* ---------- 区块 ---------- */

.section {
  padding: 96px 0;
  border-top: 1px solid var(--line);
}

.section-alt {
  background: var(--bg-alt);
}

.section-head {
  max-width: 640px;
  margin-bottom: 52px;
}

.kicker {
  margin-bottom: 12px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.section-title {
  font-size: clamp(26px, 3.2vw, 36px);
  font-weight: 660;
  letter-spacing: -0.026em;
}

.section-lead {
  margin-top: 16px;
  color: var(--fg-muted);
  font-size: 16px;
  line-height: 1.75;
}

/* ---------- 三支柱 ---------- */

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

.pillar {
  padding: 30px 28px 34px;
  background: var(--bg);
}

.pillar-icon {
  display: grid;
  width: 34px;
  height: 34px;
  margin-bottom: 18px;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
}

.pillar-icon svg {
  width: 18px;
  height: 18px;
}

.pillar h3 {
  margin-bottom: 9px;
  font-size: 16.5px;
}

.pillar p {
  color: var(--fg-muted);
  font-size: 14.5px;
  line-height: 1.72;
}

/* ---------- 特性网格 ---------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.feature {
  padding: 26px 24px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
  transition: border-color 0.18s ease, transform 0.18s ease, box-shadow 0.18s ease;
}

.feature:hover {
  border-color: var(--line-strong);
  box-shadow: var(--shadow-sm);
  transform: translateY(-2px);
}

.feature-icon {
  display: grid;
  width: 34px;
  height: 34px;
  margin-bottom: 18px;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent);
}

.feature-icon svg {
  width: 18px;
  height: 18px;
}

.feature h3 {
  margin-bottom: 9px;
  font-size: 16px;
}

.feature p {
  color: var(--fg-muted);
  font-size: 14.5px;
  line-height: 1.72;
}

/* ---------- 斜杠命令 ---------- */

.command-groups {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.command-group {
  padding: 22px 22px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
}

.command-group h3 {
  margin-bottom: 16px;
  color: var(--fg-subtle);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.command-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
}

.command-list li:last-child {
  border-bottom: none;
}

.command-list .cmd-slash {
  flex: none;
  color: var(--fg-subtle);
  font-family: var(--font-mono);
  font-size: 13px;
}

.command-list .cmd-name {
  flex: 1;
  min-width: 0;
}

.command-list .cmd-extra {
  flex: none;
  color: var(--fg-subtle);
  font-family: var(--font-mono);
  font-size: 11.5px;
}

.command-hint {
  margin-top: 22px;
  color: var(--fg-subtle);
  font-size: 13.5px;
}

/* ---------- 快捷键 ---------- */

.shortcut-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.shortcut-col {
  padding: 22px 22px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
}

.shortcut-col h3 {
  margin-bottom: 16px;
  color: var(--fg-subtle);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.shortcut-list li {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 7px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14.5px;
}

.shortcut-list li:last-child {
  border-bottom: none;
}

.shortcut-list .sc-label {
  color: var(--fg-muted);
}

kbd {
  display: inline-block;
  min-width: 22px;
  padding: 2px 6px;
  border: 1px solid var(--line-strong);
  border-bottom-width: 2px;
  border-radius: 4px;
  background: var(--bg-alt);
  color: var(--fg);
  font-size: 11.5px;
  font-weight: 550;
  line-height: 1.5;
  text-align: center;
  white-space: nowrap;
}

/* ---------- .scratch 容器示意 ---------- */

.layout-diagram {
  display: flex;
  gap: 2px;
  margin-bottom: 40px;
  padding: 20px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg-alt);
}

.seg {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  min-width: 62px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  background: var(--bg-sunken);
  text-align: center;
}

.seg-magic {
  background: var(--accent-soft);
  color: var(--accent);
}

.seg-num {
  min-width: 74px;
}

.seg-part {
  flex: 1;
  min-width: 150px;
}

.seg-meta {
  background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.seg-content {
  background: color-mix(in srgb, var(--accent) 20%, transparent);
}

.seg-crc {
  background: color-mix(in srgb, #d44c47 13%, transparent);
  color: color-mix(in srgb, #d44c47 88%, var(--fg));
}

.seg-name {
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 650;
  white-space: nowrap;
}

.seg-size {
  color: var(--fg-subtle);
  font-family: var(--font-mono);
  font-size: 10.5px;
  white-space: nowrap;
}

/* ---------- 规格表 ---------- */

.spec-table-wrap {
  margin-bottom: 40px;
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.spec-table {
  width: 100%;
  min-width: 560px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.spec-table th {
  padding: 12px 20px;
  background: var(--bg-alt);
  border-bottom: 1px solid var(--line);
  color: var(--fg-subtle);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.07em;
  text-align: left;
  text-transform: uppercase;
}

.spec-table td {
  padding: 13px 20px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.spec-table tbody tr:last-child td {
  border-bottom: none;
}

.spec-table td:first-child {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.spec-table td:nth-child(2) {
  color: var(--fg-subtle);
  font-family: var(--font-mono);
  font-size: 12.5px;
  white-space: nowrap;
}

.spec-table td:last-child {
  color: var(--fg-muted);
  line-height: 1.65;
}

/* ---------- 三条保证 ---------- */

.guarantees {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.guarantee {
  padding: 24px 22px 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--bg);
}

.guarantee-num {
  margin-bottom: 14px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
}

.guarantee h3 {
  margin-bottom: 9px;
  font-size: 15.5px;
}

.guarantee p {
  color: var(--fg-muted);
  font-size: 14.5px;
  line-height: 1.72;
}

/* ---------- 逃生通道 ---------- */

.escape-hatch {
  display: flex;
  gap: 22px;
  align-items: flex-start;
  padding: 26px 28px;
  border: 1px solid var(--accent-line);
  border-radius: var(--radius);
  background: var(--accent-soft);
}

.escape-icon {
  display: grid;
  width: 38px;
  height: 38px;
  flex: none;
  place-items: center;
  border-radius: var(--radius-sm);
  background: var(--bg);
  color: var(--accent);
}

.escape-icon svg {
  width: 19px;
  height: 19px;
}

.escape-hatch h3 {
  margin-bottom: 8px;
  font-size: 16.5px;
}

.escape-hatch p {
  max-width: 62em;
  color: var(--fg-muted);
  font-size: 14.5px;
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 16px;
}

.tag-list li {
  padding: 4px 11px;
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: 12px;
}

/* ---------- 路线图 ---------- */

.timeline {
  display: grid;
  gap: 0;
  margin-bottom: 48px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.timeline-item {
  display: grid;
  grid-template-columns: 148px minmax(0, 1fr);
  gap: 24px;
  padding: 24px 28px;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.timeline-item:last-child {
  border-bottom: none;
}

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

.timeline-stage {
  color: var(--fg-subtle);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.timeline-body h3 {
  margin-bottom: 7px;
  font-size: 16px;
}

.timeline-body p {
  color: var(--fg-muted);
  font-size: 14.5px;
  line-height: 1.72;
}

.status {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  align-self: flex-start;
  padding: 3px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 550;
}

.status::before {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  content: "";
}

.status-done {
  border-color: color-mix(in srgb, #448361 34%, transparent);
  background: color-mix(in srgb, #448361 11%, transparent);
  color: #448361;
}

.status-active {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent);
}

.status-planned {
  color: var(--fg-subtle);
}

/* ---------- 明确不做 ---------- */

.out-of-scope h3 {
  margin-bottom: 18px;
  font-size: 16px;
}

.scope-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
}

.scope-list li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 16px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius-sm);
  color: var(--fg-muted);
  font-size: 14px;
}

.scope-list li::before {
  flex: none;
  color: var(--fg-subtle);
  font-weight: 700;
  content: "\2014";
}

/* ---------- 下载 CTA ---------- */

.cta-section {
  padding: 96px 0;
  border-top: 1px solid var(--line);
}

.cta-card {
  padding: 60px 40px 64px;
  border: 1px solid var(--line);
  border-radius: 12px;
  background: var(--bg-alt);
  text-align: center;
}

.cta-card h2 {
  font-size: clamp(25px, 3.2vw, 34px);
  font-weight: 660;
  letter-spacing: -0.026em;
}

.cta-card p {
  max-width: 40em;
  margin: 16px auto 0;
  color: var(--fg-muted);
  font-size: 16px;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 32px;
}

/* ---------- 页脚 ---------- */

.site-footer {
  padding: 56px 0 40px;
  border-top: 1px solid var(--line);
  background: var(--bg-alt);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr repeat(3, minmax(0, 1fr));
  gap: 40px;
}

.footer-brand .brand-name {
  font-size: 15px;
}

.footer-desc {
  max-width: 30em;
  margin-top: 10px;
  color: var(--fg-muted);
  font-size: 13.5px;
  line-height: 1.7;
}

.footer-stack {
  margin-top: 14px;
  color: var(--fg-subtle);
  font-family: var(--font-mono);
  font-size: 11.5px;
}

.footer-col h4 {
  margin-bottom: 14px;
  color: var(--fg-subtle);
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.footer-col ul li + li {
  margin-top: 9px;
}

.footer-col a {
  color: var(--fg-muted);
  font-size: 13.5px;
  transition: color 0.15s ease;
}

.footer-col a:hover {
  color: var(--accent);
}

.footer-meta dt {
  color: var(--fg-subtle);
  font-size: 11.5px;
}

.footer-meta dd {
  margin-bottom: 10px;
  color: var(--fg-muted);
  font-size: 13.5px;
}

/* ---------- 响应式 ---------- */

/* 顶栏导航在中等宽度先收起来（保留品牌、语言、下载） */
@media (max-width: 1040px) {
  .site-nav {
    display: none;
  }
}

@media (max-width: 980px) {
  .hero {
    padding: 64px 0 72px;
  }

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

  .hero-lead {
    max-width: 100%;
  }

  .triple,
  .feature-grid,
  .command-groups,
  .shortcut-columns,
  .guarantees {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .footer-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 34px;
  }

  .timeline-item {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }

  .timeline-head {
    flex-direction: row;
    align-items: center;
    gap: 12px;
  }
}

@media (max-width: 640px) {
  .shell {
    padding: 0 20px;
  }

  .section,
  .cta-section {
    padding: 68px 0;
  }

  .header-inner {
    gap: 12px;
    height: 60px;
  }

  .brand-tagline {
    display: none;
  }

  .lang-btn {
    min-width: 40px;
    padding: 5px 8px;
  }

  .theme-toggle {
    width: 32px;
    height: 32px;
  }

  .hero-stats {
    flex-direction: column;
    gap: 16px;
    padding-top: 22px;
  }

  .stat {
    padding-right: 0;
  }

  .stat + .stat {
    padding-top: 16px;
    padding-left: 0;
    border-top: 1px solid var(--line);
    border-left: none;
  }

  .triple,
  .feature-grid,
  .command-groups,
  .shortcut-columns,
  .guarantees,
  .scope-list,
  .footer-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .cta-card {
    padding: 44px 22px 48px;
  }

  .escape-hatch {
    flex-direction: column;
    gap: 16px;
    padding: 22px;
  }

  .btn-lg {
    width: 100%;
  }
}

/* ---------- 打印 ---------- */

@media print {
  .site-header,
  .hero-cta,
  .cta-actions {
    display: none;
  }

  body {
    font-size: 12pt;
  }
}