/* ==========================================================================
   color-tool 主题样式 —— 六站家族中的「动态配色特例站」声明
   本站色板有意不采用共享 tokens.css 的 --accent/--bg/--surface 命名：
   取色器会随用户选中颜色实时改写 --color-accent / --color-primary，并用
   WCAG 对比度自动决定 --color-on-accent，静态站的品牌令牌体系无法承载这套
   运行时变色机制，故保留自有 --color-* 命名空间（非待迁移的技术债）。
   仍与家族对齐的部分：间距 --space-* / 容器宽度 / z-index 台阶 / 断点白名单
   均直接引用 tokens.css；新增样式请继续走本文件 --color-* 体系，勿另起第三套命名。
   ========================================================================== */
:root {
  color-scheme: light;
  --color-primary: #2457d6;
  --color-background: #f6f7f9;
  --color-surface: #ffffff;
  --color-text: #1a1d24;
  --color-muted-text: #5f6775;
  --color-border: #e2e6eb;
  --color-focus: #0b66ff;
  --color-code-bg: #f0f2f5;
  --color-danger: #c0352f;
  --shadow-soft: 0 6px 24px rgba(18, 23, 42, 0.08);
  /* 动态强调色，由 JS 随当前选中颜色更新 */
  --color-accent: #2457d6;
  /* 强调色上的文字色：JS 用 WCAG 对比度在黑/白间自动取值，保证任意主色都可读 */
  --color-on-accent: #ffffff;
  /* 跨站统一样式别名（审计 T6）：back-to-top 等跨站组件用 var(--accent)，
     本站真实令牌是 --color-*，不建别名则回顶按钮背景透明 */
  --accent: var(--color-accent);
  /* 广告区：文字色随主题走，亮/暗两态均达 AA */
  --ad-bg-from: #fff7e6;
  --ad-bg-to: #ffe7d6;
  --ad-title: #1a1d24;
  --ad-accent: #b34700;
  --ad-hover-border: #ff9244;
  /* 骨架屏 */
  --skeleton-base: #e7eaef;
  --skeleton-shine: #f4f6f9;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  /* --radius-sm / --radius-lg 与 tokens.css 同值，已去重（审计 T9）；--radius-md 为本站品牌档保留 */
  --radius-md: 12px;
  /* 对齐六站共享设计令牌（tokens.css）：间距基数 / 容器宽引用共享变量（取值相同，无视觉变化） */
  --space-unit: var(--space-1);
  --content-width: 1920px;
}

/* 页头高度：本站有意用 56px（工具站导航密、需把竖向空间留给取色区），
   覆盖共享令牌 --header-h: 64px；各静态站页头高度差异只允许出现在本特例站 */
:root {
  --header-h: 3.5rem;
  --subnav-h: 3.25rem;
}

/* 暗色模式令牌 */
:root[data-theme="dark"] {
  color-scheme: dark;
  --color-primary: #5b8cff;
  --color-background: #0f1115;
  --color-surface: #171a21;
  --color-text: #e7eaf0;
  --color-muted-text: #9aa3b2;
  --color-border: #2a2f3a;
  --color-focus: #6ea0ff;
  --color-code-bg: #1f232c;
  --color-danger: #ff8078;
  --shadow-soft: 0 6px 24px rgba(0, 0, 0, 0.45);
  /* 暗色下广告卡是深色渐变，标题/眉标/CTA 必须换成亮色才可读 */
  --ad-bg-from: #2a2318;
  --ad-bg-to: #241c14;
  --ad-title: #f4ecdf;
  --ad-accent: #ffb066;
  --ad-hover-border: #8a6636;
  --skeleton-base: #22262f;
  --skeleton-shine: #2c313c;
}

/* 减少 FOUC：在 JS 载入前就给强调色一个初始值（与 JS 默认值一致） */
.preview-swatch,
.convert-swatch {
  background: var(--color-accent, #2457d6);
}

* {
  box-sizing: border-box;
}

html {
  background: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h, 3.5rem) + var(--subnav-h, 3.25rem) + 0.5rem);
}

body {
  margin: 0;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

button,
input,
select,
textarea {
  font: inherit;
}

a {
  color: var(--color-primary);
}

:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
}

.skip-link {
  left: 1rem;
  position: fixed;
  top: 1rem;
  transform: translateY(-200%);
  z-index: var(--z-header);
  background: var(--color-surface);
  padding: 0.5rem 0.75rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.skip-link:focus {
  transform: translateY(0);
}

/* ---------- 共享壳层 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.site-header .shell {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  /* ≤720px 汉堡菜单展开面板的定位基准（审计 T6） */
  position: relative;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--color-text);
  text-decoration: none;
}

.brand-swatch {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 0.4rem;
  background: conic-gradient(
    #f06, #ff0, #0f0, #0ff, #00f, #f0f, #f06
  );
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.08);
}

.site-nav {
  display: flex;
  gap: 1rem;
  align-items: center;
}

.site-nav a {
  color: var(--color-muted-text);
  text-decoration: none;
  font-weight: 500;
  padding: 0.35rem 0.1rem;
}

.site-nav a[aria-current="page"],
.site-nav a:hover {
  color: var(--color-text);
}

/* 语言切换入口（中文页 → /en/，英文页 → 根目录中文页） */
.lang-switch {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.4rem 0.8rem !important;
  /* 触控目标 ≥44px（审计 T5：EN 实测 20px） */
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-muted-text) !important;
}

.lang-switch:hover {
  color: var(--color-text) !important;
  border-color: var(--color-accent, #2457d6);
}

.site-main {
  flex: 1;
  width: 100%;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2rem;
}

.site-footer {
  border-top: 1px solid var(--color-border);
  background: var(--color-surface);
}

.site-footer .shell {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 1.25rem;
}

.site-footer .footer-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1.2fr;
  align-items: start;
  gap: 1.25rem;
  margin-bottom: 0.5rem;
}
.site-footer .footer-grid h4 {
  color: var(--color-text);
  font-size: 0.82rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}
.site-footer .footer-grid ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.1875rem;
}
.site-footer .footer-grid a {
  color: var(--color-muted-text);
  font-size: 0.82rem;
  display: inline-block;
  padding: 0.125rem 0 0.125rem 0.5rem;
  border-left: 2px solid transparent;
  transition: all var(--dur-fast) ease;
  text-decoration: none;
}
.site-footer .footer-grid a:hover {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  padding-left: 0.75rem;
}
.footer-brand .brand {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
}
.footer-brand .brand-text { font-size: 0.92rem; }
.footer-brand p { margin: 0.2rem 0 0; font-size: 0.78rem; color: var(--color-muted-text); line-height: 1.4; }

.footer-contact { margin-top: 0.75rem; padding-top: 0.625rem; border-top: 1px solid var(--color-border); }
.footer-contact h4 { color: var(--color-text); font-size: 0.78rem; font-weight: 600; margin: 0 0 0.375rem; }
.footer-contact ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0.1875rem; }
.footer-contact a {
  color: var(--color-muted-text);
  font-size: 0.78rem;
  display: inline-block;
  padding: 0.125rem 0 0.125rem 0.5rem;
  border-left: 2px solid transparent;
  transition: all var(--dur-fast) ease;
}
.footer-contact a:hover {
  color: var(--color-accent);
  border-left-color: var(--color-accent);
  padding-left: 0.75rem;
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 0.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--color-muted-text);
}
.footer-bottom .legal { display: flex; gap: 0.5rem; flex-wrap: wrap; align-items: center; }
.footer-bottom a { color: var(--color-muted-text); }
.footer-bottom a:hover { color: var(--color-accent); }

@media (max-width: 980px) {
  .site-footer .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .site-footer .footer-grid { grid-template-columns: 1fr; }
}

/* ── footer 列过多时自动分两列 ── */
.site-footer .footer-col ul.is-split { display: block; column-count: 2; column-gap: 1.2rem; }
.site-footer .footer-col ul.is-split a { font-size: 0.8rem; }
@media (max-width: 720px) {
  .site-footer .footer-col ul.is-split { column-count: 1; }
}

/* ICP 备案号：独占一行（工信部要求展示并可跳转 beian.miit.gov.cn） */
.site-footer .site-beian {
  flex: 0 0 100%;
  color: inherit;
  text-decoration: none;
}

.site-footer .site-beian:hover,
.site-footer .site-beian:focus-visible {
  text-decoration: underline;
}

/* 页脚联系行（中英文站共用） */
.footer-contact {
  margin: 0;
  flex: 1 1 auto;
}
.footer-contact a {
  font-weight: 600;
  text-decoration: none;
}
.footer-contact a:hover {
  text-decoration: underline;
}

/* ==========================================================================
   英文版排版增强（仅 html[lang="en"] 生效）
   中文/英文共用一套令牌；英文需要更清晰的标题字阶与更适合长句的宽度/行距。
   ========================================================================== */
html[lang="en"] {
  --font-body: ui-sans-serif, system-ui, -apple-system, "Segoe UI Variable Text",
    "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-display: "Segoe UI Variable Display", ui-sans-serif, system-ui,
    -apple-system, "Segoe UI", Roboto, sans-serif;
  --content-width: 1140px;
}
html[lang="en"] body {
  line-height: 1.65;
}
html[lang="en"] .page-heading h1 {
  font-size: clamp(2rem, 3.2vw, 2.6rem);
  letter-spacing: -0.025em;
}
html[lang="en"] .page-heading p {
  max-width: 52em;
  font-size: 1.1rem;
}
html[lang="en"] .section-title {
  letter-spacing: -0.01em;
}
html[lang="en"] .card {
  padding: 1.4rem;
}
html[lang="en"] .coupon-hero h1 {
  font-size: clamp(2rem, 3vw, 2.4rem);
}
html[lang="en"] .coupon-hero .lead {
  max-width: 54em;
}

/* ---------- 通用组件 ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}

.card + .card {
  margin-top: 1.1rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 650;
  margin: 0 0 0.25rem;
}

.section-desc {
  margin: 0 0 1rem;
  color: var(--color-muted-text);
  font-size: 0.95rem;
}

.page-heading {
  margin: 0 0 1.1rem;
}

.page-heading h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 750;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.page-heading p {
  margin: 0;
  color: var(--color-muted-text);
  font-size: 1.05rem;
  max-width: 46em;
}

/* ---------- 取色器 ---------- */
.picker-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1.5rem;
}

/* ---------- 优惠券落地页（WO-47） ---------- */
.coupon-page {
  padding-top: 1.5rem;
  padding-bottom: 2.5rem;
}

.coupon-hero {
  background: linear-gradient(135deg, var(--ad-bg-from), var(--ad-bg-to));
  border: 1px solid var(--ad-hover-border);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  margin-bottom: 1.75rem;
}

.coupon-hero .eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ad-accent);
  background: rgba(255, 255, 255, 0.65);
  border-radius: var(--radius-pill);
  padding: 0.2rem 0.7rem;
  margin: 0 0 0.6rem;
}

.coupon-hero h1 {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 750;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
}

.coupon-hero .lead {
  margin: 0;
  color: var(--color-text);
  font-size: 1.02rem;
  max-width: 48em;
  line-height: 1.6;
}

.coupon-widget-section {
  margin-bottom: 1.5rem;
}

.coupon-widget-container {
  min-height: 8rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1rem;
  box-shadow: var(--shadow-soft);
}

.coupon-note {
  margin: 0.75rem 0 0;
  font-size: 0.85rem;
  color: var(--color-muted-text);
}

.coupon-back {
  margin-top: 1rem;
}

.coupon-back a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: 600;
}

.coupon-back a:hover {
  text-decoration: underline;
}

.preview-pane {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.preview-swatch {
  position: relative;
  /* 14rem 在 <360px 或小视口下过高，用 clamp 让它在 9rem–14rem 之间自适应 */
  height: clamp(9rem, 32vh, 14rem);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: var(--color-accent);
  transition: background var(--dur-fast) ease;
}

.preview-label {
  position: absolute;
  right: 0.75rem;
  bottom: 0.75rem;
  padding: 0.25rem 0.5rem;
  font-size: 0.75rem;
  font-weight: 600;
  /* 底色就是当前主色，文字色由 JS 按对比度在黑/白间取值，不再依赖 difference 混合 */
  color: var(--color-on-accent);
}

.controls {
  display: grid;
  gap: 0.9rem;
}

/* 窄屏下三列会互相挤压，改成 minmax：标签与数值按内容收缩，滑块吃掉剩余空间 */
.control-row {
  display: grid;
  align-items: center;
  grid-template-columns: minmax(3.5rem, auto) minmax(4rem, 1fr) minmax(2.75rem, auto);
  gap: 0.75rem;
}

.control-row label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-muted-text);
}

.control-row input[type="range"] {
  width: 100%;
  accent-color: var(--color-accent);
}

.control-row .value {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
  color: var(--color-text);
}

.color-input-row {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 0.75rem;
}

.color-input-row input[type="color"] {
  width: 3rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: none;
  cursor: pointer;
}

.color-hex-field {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

/* ---------- 色值与复制 ---------- */
.value-grid {
  display: grid;
  gap: 0.75rem;
}

.value-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  justify-content: space-between;
}

.value-row code {
  flex: 1;
  padding: 0.55rem 0.75rem;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.9rem;
  word-break: break-all;
}

.btn {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  padding: 0.55rem 0.9rem;
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  white-space: nowrap;
}

.btn:hover {
  background: var(--color-background);
}

.btn-accent {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-on-accent);
}

.btn-accent:hover {
  filter: brightness(1.05);
}

/* 一组横向排列的操作按钮：替代各页重复的内联 style="margin-top:1rem;display:flex;..." */
.btn-row {
  margin-top: 1rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  align-items: center;
}

/* ---------- 调色板生成 ---------- */
.palette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(6.5rem, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
}

.swatch-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
}

.swatch-block {
  height: 4.5rem;
}

.swatch-info {
  padding: 0.5rem 0.65rem;
  display: grid;
  gap: 0.15rem;
  font-size: 0.78rem;
  color: var(--color-muted-text);
  font-variant-numeric: tabular-nums;
}

/* ---------- 配色工作台（Coolors 式一键随机 + 逐色锁定） ---------- */
.wb-bar {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.5rem;
  margin-top: 1rem;
}

.wb-cell {
  position: relative;
  height: 12rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  overflow: hidden;
}

.wb-lock {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.16);
  color: inherit;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
}

.wb-lock[aria-pressed="true"] { background: rgba(0, 0, 0, 0.4); }

.wb-hex {
  border: none;
  background: transparent;
  color: inherit;
  font: inherit;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  cursor: pointer;
  padding: 0.4rem 0.6rem;
}

.wb-controls {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
}

.wb-controls label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-muted-text);
}

.wb-controls select {
  padding: 0.4rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: inherit;
}

@media (max-width: 720px) {
  .wb-cell { height: 8rem; }
  .wb-hex { font-size: 0.62rem; padding: 0.3rem 0.35rem; }
  .wb-lock { width: 1.6rem; height: 1.6rem; font-size: 0.85rem; }
}

/* ---------- 颜色转换 ---------- */
.convert-form {
  display: grid;
  gap: 1rem;
}

.convert-form label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-muted-text);
  margin-bottom: 0.4rem;
}

.convert-form input[type="text"] {
  width: 100%;
  padding: 0.65rem 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
}

.convert-result {
  margin-top: 0.25rem;
  display: grid;
  gap: 0.6rem;
}

.convert-swatch {
  height: 3.5rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: var(--color-accent);
}

.hint {
  font-size: 0.82rem;
  color: var(--color-muted-text);
}

/* ---------- 通用：复制反馈 ---------- */
.is-flash {
  outline: 2px solid var(--color-accent) !important;
  outline-offset: 2px;
  transition: outline-color var(--dur-base) ease;
}

.btn.is-flash {
  filter: brightness(1.05);
}

/* ---------- 自营广告位（ad-slots.js 由 ad-slots.json 渲染） ---------- */
/* 容器：取不到广告时彻底不占位，避免出现空框 */
.ad-slot:empty { display: none; }

.ad-slot {
  margin-top: 1.5rem;
}

.ad-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.35rem;
  padding: 1.25rem 1.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--ad-bg-from) 0%, var(--ad-bg-to) 100%);
  text-align: left;
  text-decoration: none;
  color: inherit;
  transition: transform var(--dur-base) ease, box-shadow var(--dur-base) ease, border-color var(--dur-base) ease;
}

.ad-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
  border-color: var(--ad-hover-border);
}

/* 头部行：眉标居左、角标居右，两端对齐，文字长时省略号截断，永不重叠 */
.ad-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  width: 100%;
  min-width: 0;
}

.ad-badge {
  flex-shrink: 0;
  font-size: 0.7rem;
  color: var(--color-muted-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: 0.1rem 0.5rem;
  white-space: nowrap;
}

.ad-desc {
  font-size: 0.85rem;
  color: var(--color-muted-text);
  line-height: 1.6;
}

.ad-eyebrow {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ad-accent);
  text-transform: uppercase;
}

/* 广告图：来自 ad-slots.json 的 image 字段，加载完成才显示，避免破图占位
   宽横幅（宽高比 ≥ 2）：铺满宽度、按高度裁切；
   方图/竖图：完整居中展示，不拉伸不裁切，避免模糊与构图破碎 */
.ad-image {
  display: block;
  width: 100%;
  max-height: 140px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  margin: 6px 0 2px;
  opacity: 0;
  transition: opacity var(--dur-base);
}

.ad-image[data-shape="square"] {
  width: auto;
  max-width: min(100%, 260px);
  height: 140px;
  max-height: 140px;
  object-fit: contain;
  align-self: center;
  background: rgba(255, 255, 255, 0.5);
}

:root[data-theme="dark"] .ad-image[data-shape="square"] {
  background: rgba(255, 255, 255, 0.08);
}

.ad-image[data-loaded="1"] { opacity: 1; }

/* 站外广告标题/描述可能很长，统一截断，避免卡片高度失控 */
.ad-card > span { width: 100%; }

.ad-title {
  font-size: 1.12rem;
  font-weight: 750;
  letter-spacing: -0.01em;
  color: var(--ad-title);
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  line-height: 1.35;
}

/* 域名出售位保留等宽大标题，站外广告标题较长用小号 */
.ad-card--domain .ad-title {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 1.6rem;
  -webkit-line-clamp: 1;
}

.ad-desc {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.ad-cta {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ad-accent);
}

.event-note {
  margin-top: 1rem;
  font-size: 0.88rem;
  color: var(--color-primary);
}

/* ---------- 关于页 ---------- */
.prose h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  margin: 1.5rem 0 0.5rem;
}

.prose p,
.prose li {
  color: var(--color-muted-text);
  line-height: 1.7;
}

.prose ul {
  margin: 0.5rem 0;
  padding-left: 1.25rem;
}

/* ---------- 配色方案生成 ---------- */
.seg-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.seg-btn {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: var(--radius-pill);
  padding: 0.45rem 1rem;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
}

.seg-btn:hover {
  background: var(--color-background);
}

.seg-btn[aria-pressed="true"] {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-on-accent);
}

.schema-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(6.5rem, 1fr));
  gap: 0.75rem;
}

.schema-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
}

.schema-block {
  height: 5rem;
}

.schema-info {
  padding: 0.5rem 0.65rem;
  display: grid;
  gap: 0.15rem;
  font-size: 0.78rem;
  color: var(--color-muted-text);
  font-variant-numeric: tabular-nums;
}

.schema-info b {
  color: var(--color-text);
  font-weight: 600;
}

/* ---------- 渐变生成器 ---------- */
.grad-preview {
  height: 9.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  background: linear-gradient(120deg, var(--grad-from, #ff6633), var(--grad-to, #2457d6));
}

.grad-controls {
  margin-top: 1rem;
  display: grid;
  gap: 1rem;
}

.grad-colors {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem;
  align-items: flex-start;
}

.grad-color {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  gap: 0.6rem;
}

.grad-color label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-muted-text);
}

.grad-color input[type="color"] {
  width: 2.75rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: none;
  cursor: pointer;
}

.grad-color code {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.85rem;
}

.grad-row {
  display: grid;
  align-items: center;
  grid-template-columns: auto 1fr 4rem;
  gap: 0.75rem;
}

.grad-row .value {
  text-align: right;
  font-variant-numeric: tabular-nums;
  font-size: 0.9rem;
  color: var(--color-text);
}

.grad-row label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-muted-text);
}

.grad-row input[type="range"] {
  width: 100%;
  accent-color: var(--color-accent);
}

.grad-output {
  margin-top: 0.5rem;
}

.grad-css {
  padding: 0.6rem 0.75rem;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.85rem;
  word-break: break-all;
}

/* ---------- 对比度检测 ---------- */
.contrast-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 1.5rem;
  align-items: start;
}

.contrast-inputs {
  display: grid;
  gap: 1rem;
}

.contrast-field {
  display: grid;
  grid-template-columns: auto auto 1fr;
  align-items: center;
  gap: 0.75rem;
}

.contrast-field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-muted-text);
}

.contrast-field input[type="color"] {
  width: 2.75rem;
  height: 2.25rem;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: none;
  cursor: pointer;
}

.contrast-field code {
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  font-size: 0.85rem;
  word-break: break-all;
}

.ratio-box {
  text-align: center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  min-width: 11rem;
  background: var(--color-surface);
}

.ratio-big {
  font-size: 2.4rem;
  font-weight: 750;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.ratio-label {
  color: var(--color-muted-text);
  font-size: 0.85rem;
}

.grade-row {
  display: flex;
  gap: 0.4rem;
  justify-content: center;
  margin-top: 0.75rem;
}

/* 未达标徽章是 0.78rem 粗体小字，用正文色而非弱化色，保证对比度达 AA */
.grade-badge {
  font-size: 0.78rem;
  font-weight: 700;
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}

.grade-badge.pass {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-on-accent);
}

.contrast-sample {
  margin-top: 1.25rem;
  padding: 1.5rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  color: var(--sample-fg, #fff);
  background: var(--sample-bg, #fff);
  font-size: 1rem;
  line-height: 1.7;
}

.contrast-sample .small {
  font-size: 0.85rem;
  opacity: 0.85;
}

/* ---------- 随机配色灵感 ---------- */
.random-hint {
  color: var(--color-muted-text);
  font-size: 0.85rem;
  margin: 0 0 1rem;
}

.random-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 0.6rem;
}

.random-card {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
}

.random-block {
  height: 5.5rem;
}

.random-info {
  padding: 0.5rem 0.55rem;
  font-size: 0.78rem;
  color: var(--color-muted-text);
  font-variant-numeric: tabular-nums;
  word-break: break-all;
}

/* ---------- 导出格式选择 ---------- */
.export-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
  margin-top: 1rem;
}

.export-bar label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-muted-text);
}

.export-bar select,
.export-bar input[type="text"] {
  padding: 0.45rem 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 0.85rem;
}

/* ---------- 历史记录 / 收藏夹 ---------- */
.history-box {
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.history-box h3 {
  font-size: 0.9rem;
  font-weight: 650;
  margin: 0 0 0.5rem;
  color: var(--color-text);
}

.history-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  min-height: 2rem;
}

.history-empty {
  color: var(--color-muted-text);
  font-size: 0.82rem;
  font-style: italic;
}

.history-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  cursor: pointer;
  font-size: 0.78rem;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
  color: var(--color-text);
}

.history-chip:hover {
  background: var(--color-background);
}

.history-chip-swatch {
  width: 1rem;
  height: 1rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
}

.history-chip-label {
  font-variant-numeric: tabular-nums;
}

.history-clear {
  margin-top: 0.5rem;
  font-size: 0.78rem;
  padding: 0.25rem 0.6rem;
}

/* 收藏夹 */
.fav-row {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  margin-bottom: 0.4rem;
}

.fav-swatch {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 0.25rem;
  border: 1px solid var(--color-border);
}

.fav-load {
  margin-left: auto;
  font-size: 0.78rem;
  padding: 0.2rem 0.6rem;
}

.fav-del {
  border: none;
  background: none;
  color: var(--color-muted-text);
  font-size: 1rem;
  cursor: pointer;
  padding: 0 0.3rem;
}

.fav-del:hover {
  color: var(--color-danger);
}

/* ---------- 图片取色 ---------- */
.img-drop {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.25rem;
  text-align: center;
  color: var(--color-muted-text);
  cursor: pointer;
  transition: border-color var(--dur-fast) ease, background var(--dur-fast) ease;
}

.img-drop:hover,
.img-drop.drag-over {
  border-color: var(--color-accent);
  background: var(--color-background);
}

.img-drop.has-image {
  border-style: solid;
  text-align: left;
  padding: 1rem;
}

.img-drop input[type="file"] {
  display: none;
}

.img-canvas-wrap {
  margin-top: 0.75rem;
  text-align: center;
}

#img-canvas {
  display: none;
  max-width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  cursor: crosshair;
}

.img-pick-result {
  margin-top: 0.6rem;
  padding: 0.5rem 0.75rem;
  border-left: 3px solid var(--color-border);
  background: var(--color-background);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-family: ui-monospace, "Cascadia Mono", Consolas, monospace;
}

/* ---------- 相关工具内链 ---------- */
.related-tools {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.related-tools h3 {
  font-size: 0.9rem;
  font-weight: 650;
  margin: 0 0 0.6rem;
  color: var(--color-text);
}

.related-tools ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.related-tools a {
  display: inline-block;
  padding: 0.3rem 0.7rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  background: var(--color-surface);
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
}

.related-tools a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---------- 主题切换按钮 ---------- */
.theme-toggle {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.7rem;
  font-size: 0.82rem;
  cursor: pointer;
  font-weight: 600;
}

/* ---------- 工具落地页静态说明（供爬虫读取） ---------- */
.tool-docs {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid var(--color-border);
}

.tool-docs details {
  margin-bottom: 0.6rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  background: var(--color-surface);
}

.tool-docs summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
}

.tool-docs details p {
  margin: 0.5rem 0 0;
  color: var(--color-muted-text);
  font-size: 0.88rem;
  line-height: 1.6;
}

/* ---------- 骨架屏（网格懒渲染占位，避免空白与布局跳动） ---------- */
.is-skeleton {
  pointer-events: none;
}

.skeleton-block,
.skeleton-line {
  background: var(--skeleton-base);
  background-image: linear-gradient(
    90deg,
    var(--skeleton-base) 0%,
    var(--skeleton-shine) 40%,
    var(--skeleton-base) 80%
  );
  background-size: 300% 100%;
  animation: skeleton-sweep 1.4s ease-in-out infinite;
}

.skeleton-line {
  display: block;
  height: 0.7rem;
  width: 70%;
  border-radius: var(--radius-pill);
}

@keyframes skeleton-sweep {
  from { background-position: 150% 0; }
  to { background-position: -150% 0; }
}

/* ---------- 分享配色提示条（来自 #pal= / #sch= / #rnd= 链接） ---------- */
.share-hint {
  margin-top: 0.75rem;
  padding: 0.5rem 0.75rem;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-code-bg);
  font-size: 0.85rem;
  color: var(--color-muted-text);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.link-btn {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  color: var(--color-accent);
  cursor: pointer;
  text-decoration: underline;
}

/* ---------- 嵌入模式：被 iframe 引用时只保留工具本体 ---------- */
[data-embed="1"] .skip-link,
[data-embed="1"] .site-header,
[data-embed="1"] .site-nav,
[data-embed="1"] .page-heading {
  display: none;
}

/* 嵌入态页脚只保留 ICP 备案号（合规要求）；隐藏其余页脚内容（联系行等）与跨站出站卡，避免 iframe 内出现双重导航/递归内嵌 */
[data-embed="1"] .site-footer .shell > :not(.site-beian),
[data-embed="1"] .site-footer .cap-block {
  display: none;
}

[data-embed="1"] .site-footer .shell {
  padding: 0.75rem 1rem;
  justify-content: flex-start;
}

[data-embed="1"] .site-main {
  padding: 0.75rem;
}

[data-embed="1"][data-embed-ads="0"] .ad-slot {
  display: none;
}

/* 代码块背景统一 */
.value-row code,
.grad-css {
  background: var(--color-code-bg);
}

/* 卡片阴影 */
.card {
  box-shadow: var(--shadow-soft);
}

/* ---------- 首页分区吸顶导航 ---------- */
.section-nav {
  position: sticky;
  top: var(--header-h, 3.5rem);
  z-index: 15;
  display: flex;
  gap: 6px;
  overflow-x: auto;
  padding: 0.5rem 0;
  margin-bottom: 1.25rem;
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.section-nav::-webkit-scrollbar { display: none; }
.section-nav a {
  flex: 0 0 auto;
  padding: 0.4rem 0.85rem;
  border-radius: var(--radius-pill);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--color-muted-text);
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: background var(--dur-fast), color var(--dur-fast), border-color var(--dur-fast);
}
.section-nav a:hover {
  color: var(--color-text);
  border-color: var(--color-border);
}
.section-nav a.is-active {
  background: var(--color-accent);
  color: var(--color-on-accent);
  border-color: var(--color-accent);
}

/* ---------- 响应式 ---------- */
@media (max-width: 720px) {
  .picker-grid {
    grid-template-columns: 1fr;
  }

  .site-nav {
    gap: 0.75rem;
  }

  .page-heading h1 {
    font-size: 1.6rem;
  }

  .card {
    padding: 1.25rem;
  }

  .contrast-layout {
    grid-template-columns: 1fr;
  }

  .random-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 420px) {
  .random-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 超窄屏（<360px）：标签换行、色板收窄，避免文字被挤压截断 */
@media (max-width: 360px) {
  .site-main {
    padding: 1.5rem 0.875rem 2.5rem;
  }

  .card {
    padding: 1rem;
  }

  .control-row {
    grid-template-columns: minmax(0, 1fr) minmax(2.5rem, auto);
    gap: 0.35rem 0.5rem;
  }

  .control-row label {
    grid-column: 1;
  }

  .control-row .value {
    grid-column: 2;
  }

  .control-row input[type="range"] {
    grid-column: 1 / -1;
  }

  .palette-grid,
  .schema-grid {
    grid-template-columns: repeat(auto-fit, minmax(5rem, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: var(--dur-fast) !important;
  }
}

/* ---------- 配色灵感图库 ---------- */
.gallery-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin: 1.5rem 0 1.25rem;
}
.gallery-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.g-chip {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-muted-text);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.85rem;
  font-size: 0.82rem;
  cursor: pointer;
  transition: border-color var(--dur-fast) ease, color var(--dur-fast) ease, background var(--dur-fast) ease;
}
.g-chip:hover { border-color: var(--color-focus); color: var(--color-primary); }
.g-chip.is-active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.btn-fav-filter {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: var(--radius-pill);
  padding: 0.4rem 0.95rem;
  font-size: 0.85rem;
  cursor: pointer;
  white-space: nowrap;
}
.btn-fav-filter.is-active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.palette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1.1rem;
}
.palette-card {
  position: relative;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}
.palette-swatches { display: flex; height: 92px; }
.swatch {
  flex: 1;
  border: 0;
  padding: 0;
  cursor: pointer;
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: center;
}
.swatch-label {
  font-size: 0.62rem;
  font-family: ui-monospace, Consolas, monospace;
  background: rgba(0, 0, 0, 0.42);
  color: #fff;
  padding: 1px 4px;
  border-radius: var(--radius-sm);
  margin-bottom: 6px;
  opacity: 0;
  transition: opacity var(--dur-fast) ease;
}
.swatch:hover .swatch-label { opacity: 1; }
.palette-meta { padding: 0.75rem 0.85rem 0.85rem; }
.palette-name { margin: 0 0 0.4rem; font-size: 0.98rem; color: var(--color-text); }
.palette-tags { display: flex; flex-wrap: wrap; gap: 0.35rem; }
.palette-tag {
  font-size: 0.72rem;
  color: var(--color-muted-text);
  background: var(--color-code-bg, #f0f2f5);
  border-radius: var(--radius-pill);
  padding: 1px 8px;
}
.fav-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 30px;
  height: 30px;
  border-radius: var(--radius-full);
  border: 1px solid rgba(255, 255, 255, 0.7);
  background: rgba(0, 0, 0, 0.35);
  color: #fff;
  font-size: 1rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}
.fav-btn.is-fav { background: var(--color-primary); border-color: var(--color-primary); }
.gallery-empty { color: var(--color-muted-text); text-align: center; padding: 2rem 0; }

/* 工具条动作区 + 随机发现 */
.gallery-actions { display: flex; align-items: center; gap: 0.6rem; flex-wrap: wrap; }
.btn-random-discover {
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  border-radius: var(--radius-pill);
  padding: 0.4rem 0.95rem;
  font-size: 0.85rem;
  cursor: pointer;
  white-space: nowrap;
  transition: border-color var(--dur-fast) ease, color var(--dur-fast) ease, box-shadow var(--dur-fast) ease;
}
.btn-random-discover:hover { border-color: var(--color-primary); color: var(--color-primary); box-shadow: 0 2px 10px rgba(36,87,214,.16); }
.palette-hint { margin-top: .5rem; font-size: .74rem; color: var(--color-muted-text); opacity: .8; }
.palette-card { cursor: pointer; transition: transform var(--dur-base) ease, box-shadow var(--dur-base) ease, border-color var(--dur-base) ease; }
.palette-card:hover { transform: translateY(-3px); border-color: var(--color-focus); box-shadow: 0 10px 28px rgba(18,23,42,.14); }
.palette-card:focus-visible { outline: 3px solid var(--color-focus); outline-offset: 3px; }
.palette-card.is-flash { animation: palFlash 1.2s ease; }
@keyframes palFlash {
  0%, 100% { box-shadow: var(--shadow-soft); }
  30% { box-shadow: 0 0 0 3px var(--color-focus), 0 12px 30px rgba(18,23,42,.2); }
}

/* 配色详情浮层 */
.pal-detail {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: clamp(0.5rem, 3vw, 2rem);
}
.pal-detail[hidden] { display: none; }
.pal-detail-mask {
  position: absolute;
  inset: 0;
  background: rgba(10, 12, 18, .55);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.pal-detail-card {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 960px;
  max-height: calc(100dvh - 2rem);
  overflow: auto;
  background: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 60px rgba(0, 0, 0, .35);
  padding: clamp(1.1rem, 3vw, 1.8rem);
}
body.pal-detail-open { overflow: hidden; }
.pal-detail-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 38px;
  height: 38px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: var(--color-background);
  color: var(--color-muted-text);
  cursor: pointer;
  font-size: 1rem;
  line-height: 1;
}
.pal-detail-close:hover { color: var(--color-primary); border-color: var(--color-primary); }
.pal-detail-head { display: flex; align-items: baseline; gap: .8rem; flex-wrap: wrap; padding-right: 2.5rem; }
.pal-detail-name { margin: 0 0 .4rem; font-size: 1.4rem; }
.pal-detail-desc { color: var(--color-muted-text); font-size: .92rem; margin: .5rem 0 1rem; }
.pal-stripes { display: flex; height: 120px; border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--color-border); }
.pal-stripe { flex: 1; }
.pal-primary {
  display: flex; align-items: center; gap: .9rem;
  margin: 1rem 0;
  padding: .75rem 1rem;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}
.pal-chip-lg { width: 46px; height: 46px; border-radius: var(--radius-sm); border: 1px solid var(--color-border); flex: none; }
.pal-primary-label { font-size: .7rem; letter-spacing: .06em; text-transform: uppercase; color: var(--color-muted-text); }
.pal-primary-hex { font-size: 1.15rem; font-weight: 600; }
.pal-list { display: flex; flex-direction: column; gap: .5rem; margin-bottom: 1.2rem; }
.pal-row {
  display: flex; align-items: center; gap: .8rem;
  width: 100%;
  text-align: left;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: .55rem .8rem;
  cursor: pointer;
  color: var(--color-text);
}
.pal-row:hover { border-color: var(--color-focus); }
.pal-chip { width: 28px; height: 28px; border-radius: var(--radius-sm); border: 1px solid var(--color-border); flex: none; }
.pal-hex { font-family: ui-monospace, Consolas, monospace; font-size: .92rem; flex: 1; }
.pal-rgb { color: var(--color-muted-text); font-size: .8rem; }
.pal-copy { color: var(--color-muted-text); font-size: .78rem; }

/* 实时 UI 预览 */
.pal-preview { border-top: 1px dashed var(--color-border); padding-top: 1rem; display: flex; flex-direction: column; gap: .9rem; }
.pal-preview-title { font-size: .72rem; letter-spacing: .12em; text-transform: uppercase; color: var(--color-muted-text); }
.pv-row { display: flex; gap: .7rem; flex-wrap: wrap; align-items: center; }
.pv-block { display: flex; flex-direction: column; gap: .4rem; }
.pv-label { font-size: .78rem; color: var(--color-muted-text); }
.pv-btn { border: 0; border-radius: var(--radius-sm); padding: .6rem 1.4rem; font-weight: 600; font-size: .9rem; cursor: pointer; }
.pv-btn-outline { background: none; border: 1.5px solid; border-radius: var(--radius-sm); padding: .55rem 1.3rem; font-weight: 600; font-size: .9rem; cursor: pointer; }
.pv-card { border: 1px solid; border-radius: var(--radius-sm); padding: .9rem 1rem; }
.pv-card-title { font-size: .95rem; font-weight: 700; margin-bottom: .3rem; }
.pv-card-text { font-size: .82rem; color: var(--color-muted-text); line-height: 1.5; }
.pv-input { width: 100%; border: 1.5px solid; border-radius: var(--radius-sm); background: var(--color-background); color: var(--color-text); padding: .6rem .8rem; font-size: .9rem; }
.pv-stars { display: flex; gap: .2rem; font-size: 1.2rem; }
.pv-star { line-height: 1; }
.pv-badge { font-size: .74rem; font-weight: 600; padding: .2rem .6rem; border-radius: var(--radius-pill); }
.pv-grad { height: 10px; border-radius: var(--radius-sm); }

@media (max-width: 640px) {
  .pal-stripes { height: 88px; }
  .pal-rgb { display: none; }
}

/* 返回顶部按钮（跨站统一） */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 46px;
  height: 46px;
  border: 0;
  border-radius: var(--radius-full);
  background: var(--accent);
  /* 本站强调色由 JS 动态更新，文字色走 --color-on-accent 配对，保证任意主色可读（审计 T6） */
  color: var(--color-on-accent, #fff);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity var(--dur-base) ease, visibility var(--dur-base) ease, transform var(--dur-base) ease, background var(--dur-base) ease;
  z-index: var(--z-dropdown);
}
.back-to-top.is-visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--accent-strong, var(--accent)); }
.back-to-top:focus-visible { outline: 2px solid var(--accent-strong, var(--accent)); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  .back-to-top { transition: none; }
}

/* ≤720px 汉堡菜单折叠（审计 T6，参照 visitor/history 口径）：
   ☰ 按钮由 color-tool.js 自注入，无需改各页 HTML */
.nav-burger { display: none; }
@media (max-width: 720px) {
  .nav-burger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    /* 触控目标 ≥44px（审计 T5） */
    min-width: 44px;
    min-height: 44px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-surface);
    color: var(--color-text);
    font-size: 1.15rem;
    cursor: pointer;
  }
  .site-nav {
    display: none;
    position: absolute;
    top: calc(100% + 4px);
    right: 1.25rem;
    left: 1.25rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.4rem;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
    z-index: 30;
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 0.65rem 0.8rem; min-height: 44px; }
  .site-nav .theme-toggle { min-height: 44px; }
}

/* ---------- 色彩学院 learn ---------- */
.quickstart-steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: .85rem; }
.quickstart-steps li { display: flex; align-items: flex-start; gap: .75rem; font-size: .95rem; color: var(--color-text); line-height: 1.6; }
.qs-num { flex: none; width: 1.7rem; height: 1.7rem; border-radius: var(--radius-full); background: var(--color-primary); color: #fff; font-weight: 700; font-size: .9rem; display: grid; place-items: center; }
.quickstart-steps b { color: var(--color-primary); }

.learn-stage { display: grid; grid-template-columns: 1fr; gap: 1.4rem; margin: 1.5rem 0; }
@media (min-width: 880px) { .learn-stage { grid-template-columns: minmax(0,1fr) minmax(0,1fr); align-items: start; } }
.wheel-card { position: relative; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 1.1rem; box-shadow: var(--shadow-soft); }
.wheel-card svg { width: 100%; height: auto; display: block; touch-action: manipulation; }
.wedge { cursor: pointer; transition: opacity var(--dur-slow) ease, stroke-width var(--dur-base) ease; stroke: var(--color-surface); stroke-width: 2; }
.wedge.sel { stroke: #ffd166; stroke-width: 6; }
.wedge.sel-warm { stroke: #ff7a45; stroke-width: 5; }
.wedge.sel-cool { stroke: #38bdf8; stroke-width: 5; }
.wedge.dim { opacity: .22; }
.wedge:focus-visible { outline: none; stroke: var(--color-focus); stroke-width: 6; }
.wlabel { font-size: 15px; font-weight: 700; fill: var(--color-text); paint-order: stroke; stroke: var(--color-surface); stroke-width: 3px; pointer-events: none; }
.hub { position: absolute; left: 50%; top: 50%; transform: translate(-50%,-50%); width: 150px; height: 150px; border-radius: var(--radius-full); background: var(--color-surface); border: 1px solid var(--color-border); display: flex; flex-direction: column; align-items: center; justify-content: center; text-align: center; box-shadow: var(--shadow-soft); pointer-events: none; padding: 6px; }
.hub .h-main { font-size: 15px; font-weight: 800; line-height: 1.25; color: var(--color-text); }
.hub .h-sub { font-size: 12.5px; color: var(--color-muted-text); margin-top: 3px; line-height: 1.3; }

.learn-panel, .panel { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 1.25rem; box-shadow: var(--shadow-soft); }
.tabs { display: flex; flex-wrap: wrap; gap: .5rem; margin-bottom: 1.1rem; }
.tab { flex: 1 1 auto; min-width: 78px; border: 1px solid var(--color-border); background: var(--color-background); color: var(--color-text); border-radius: var(--radius-sm); padding: .55rem .4rem; font-size: 14px; font-weight: 600; cursor: pointer; transition: all var(--dur-base) ease; }
.tab:hover { border-color: var(--color-focus); color: var(--color-primary); }
.tab.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.q { display: inline-flex; align-items: center; gap: 8px; font-size: 13px; font-weight: 700; color: var(--color-primary); background: var(--color-code-bg); border-radius: var(--radius-pill); padding: 5px 12px; margin-bottom: .7rem; }
.q::before { content: "?"; display: inline-grid; place-items: center; width: 18px; height: 18px; border-radius: var(--radius-full); background: var(--color-primary); color: #fff; font-size: 12px; font-weight: 800; }
.explain { font-size: 15px; color: var(--color-text); line-height: 1.75; }
.explain .key { color: var(--color-primary); font-weight: 700; }
.note { font-size: 13px; color: var(--color-muted-text); margin-top: .8rem; }
.learn-demo { margin-top: 1rem; }
.learn-demo[hidden] { display: none; }
.demo-title { font-size: .82rem; color: var(--color-muted-text); margin-bottom: .5rem; }
.ladder { display: flex; border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--color-border); }
.ladder-cell { flex: 1; min-height: 58px; display: flex; align-items: center; justify-content: center; cursor: pointer; font-family: ui-monospace, Consolas, monospace; font-size: .66rem; padding: .3rem .1rem; transition: transform var(--dur-fast) ease; }
.ladder-cell:hover { transform: scaleY(1.06); }
.ladder-cell.copied { outline: 2px solid var(--color-focus); outline-offset: -2px; }
.contrast-box { border-radius: var(--radius-sm); padding: 1rem 1.1rem; border: 1px solid var(--color-border); }
.cb-lg { font-size: 1.4rem; font-weight: 800; }
.cb-sm { font-size: .92rem; margin-top: .35rem; }
.contrast-meta { display: flex; align-items: center; gap: .7rem; flex-wrap: wrap; margin-top: .6rem; }
.cm-ratio { font-size: 1.1rem; font-weight: 800; color: var(--color-text); }
.cm-badge { font-size: .76rem; font-weight: 700; padding: .18rem .6rem; border-radius: var(--radius-pill); }
.cm-ok { background: #e6f4ea; color: #1e7e34; }
.cm-warn { background: #fff4e0; color: #9a6400; }
.cm-no { background: #fdecea; color: #c0352f; }
:root[data-theme="dark"] .cm-ok { background: #123a1e; color: #6ee7a0; }
:root[data-theme="dark"] .cm-warn { background: #3a2c0e; color: #ffcf70; }
:root[data-theme="dark"] .cm-no { background: #3a1414; color: #ff9c94; }
.cm-note { font-size: .76rem; color: var(--color-muted-text); font-family: ui-monospace, Consolas, monospace; }
.temp-cols { display: flex; gap: .6rem; }
.temp-col { flex: 1; border-radius: var(--radius-sm); padding: .7rem .8rem; font-size: .82rem; border: 1px solid var(--color-border); }
.temp-col b { display: block; font-size: .95rem; margin-bottom: .2rem; }
.temp-warm { background: #fff1ea; color: #8a2f12; }
.temp-cool { background: #e9f4ff; color: #12456e; }
:root[data-theme="dark"] .temp-warm { background: #3a1c12; color: #ffb08a; }
:root[data-theme="dark"] .temp-cool { background: #122a3a; color: #8fd0ff; }
.temp-hint { font-size: .82rem; color: var(--color-muted-text); margin: .6rem 0 0; }

.mixbar { display: flex; align-items: center; gap: .5rem; flex-wrap: wrap; margin-top: 1rem; }
.mixbar[hidden] { display: none; }
.chip { font-size: 13px; border: 1px solid var(--color-border); border-radius: var(--radius-pill); padding: 5px 11px; background: var(--color-background); color: var(--color-text); }
.chip.primary { border-color: var(--color-primary); color: var(--color-primary); }
.chip.secondary { border-color: #2a5b7c; color: #2a5b7c; }
:root[data-theme="dark"] .chip.secondary { border-color: #7fb4d8; color: #7fb4d8; }
.chip.picked { background: #ffd166; border-color: #caa12e; color: #1a1d24; font-weight: 700; }
.learn-deeplink { margin-top: 1rem; }
.dl-link { display: inline-block; font-size: .9rem; font-weight: 600; color: var(--color-primary); border: 1px solid var(--color-border); border-radius: var(--radius-sm); padding: .5rem .85rem; text-decoration: none; transition: border-color var(--dur-fast) ease, background var(--dur-fast) ease; }
.dl-link:hover { border-color: var(--color-primary); background: var(--color-code-bg); }

.legend { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: .8rem; margin: 1.5rem 0; }
.leg { display: flex; align-items: center; gap: .6rem; font-size: 14px; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: .7rem .9rem; }
.leg small { display: block; color: var(--color-muted-text); font-size: 12px; }
.dot { width: 22px; height: 22px; border-radius: var(--radius-sm); border: 1px solid var(--color-border); flex: none; }
.dot-hl { background: #ffd166; border-color: #caa12e; }

.quiz .section-desc { color: var(--color-muted-text); font-size: .9rem; margin-top: -.3rem; }
.ques { margin-bottom: 1.2rem; }
.ques p { font-weight: 600; font-size: 15px; margin: 0 0 .5rem; color: var(--color-text); }
.opt { display: flex; align-items: center; gap: .5rem; font-size: 14.5px; padding: .5rem .7rem; border: 1px solid var(--color-border); border-radius: var(--radius-sm); margin: .35rem 0; cursor: pointer; background: var(--color-background); color: var(--color-text); }
.opt input { margin: 0; }
.opt.correct { background: #eaf6ec; border-color: #4f7942; }
.opt.wrong { background: #fdecea; border-color: #c0352f; }
:root[data-theme="dark"] .opt.correct { background: #12331a; border-color: #3f8a55; }
:root[data-theme="dark"] .opt.wrong { background: #331515; border-color: #a4493f; }
.fb { font-size: 13.5px; margin-top: .4rem; color: var(--color-muted-text); }
.fb.ok { color: #2f7d3b; }
.fb.no { color: #c0352f; }
:root[data-theme="dark"] .fb.ok { color: #6ee7a0; }
:root[data-theme="dark"] .fb.no { color: #ff9c94; }
.btn-ghost { background: none; }
.quiz-score { font-weight: 700; margin-top: .6rem; }
.quiz-score.score-ok { color: #2f7d3b; }
.quiz-score.score-low { color: #c0352f; }
:root[data-theme="dark"] .quiz-score.score-ok { color: #6ee7a0; }
:root[data-theme="dark"] .quiz-score.score-low { color: #ff9c94; }

/* ============================================================
 * 新增工具页组件：颜色混合器 / 色盲模拟器 / 图片调色板 / 命名色查找
 * ============================================================ */

/* 颜色混合器 color-mixer */
.mix-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin-bottom: 1rem; }
.mix-color { display: flex; flex-direction: column; gap: .45rem; }
.mix-color label { font-size: .85rem; font-weight: 600; color: var(--color-muted-text); }
@media (max-width: 640px) { .mix-inputs { grid-template-columns: 1fr; } }
.mix-result-swatch { height: 120px; border-radius: var(--radius-md); border: 1px solid var(--color-border); display: flex; align-items: center; justify-content: center; margin: 1rem 0 .8rem; transition: background var(--dur-fast) ease; }
.mix-scale { display: flex; gap: 2px; margin: .8rem 0 1rem; }
.mix-stop { flex: 1 1 0; height: 44px; border: none; border-radius: var(--radius-sm); cursor: pointer; padding: 0; transition: transform var(--dur-fast) ease; }
.mix-stop:first-child { border-radius: 8px 4px 4px 8px; }
.mix-stop:last-child { border-radius: 4px 8px 8px 4px; }
.mix-stop:hover { transform: scaleY(1.12); }
.mix-stop.is-copied { outline: 2px solid var(--color-primary); outline-offset: -2px; }

/* 色盲模拟器 color-blindness */
.seg-group-wrap { flex-wrap: wrap; row-gap: .5rem; }
.cb-board { display: flex; flex-direction: column; gap: .5rem; margin: 1rem 0; overflow-x: auto; padding-bottom: .25rem; }
.cb-row { display: grid; grid-template-columns: 5.5rem repeat(9, minmax(64px, 1fr)); gap: .4rem; align-items: stretch; min-width: 720px; }
.cb-row-label { display: flex; align-items: center; font-size: .78rem; color: var(--color-muted-text); font-weight: 600; }
.cb-cell { min-height: 64px; border-radius: var(--radius-sm); border: 1px solid var(--color-border); display: flex; align-items: flex-end; justify-content: center; padding: .3rem .2rem; }
.cb-cell-label { font-size: .68rem; font-weight: 600; letter-spacing: .02em; }
.cb-cell-copy { cursor: pointer; transition: transform var(--dur-fast) ease, box-shadow var(--dur-fast) ease; }
.cb-cell-copy:hover { transform: translateY(-2px); box-shadow: var(--shadow-soft); }

/* 图片调色板 image-palette */
.ip-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: .7rem; margin: 1rem 0; }
.ip-card { border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: .8rem .7rem .6rem; display: flex; flex-direction: column; gap: .25rem; cursor: pointer; text-align: left; min-height: 96px; justify-content: flex-end; font: inherit; transition: transform var(--dur-fast) ease, box-shadow var(--dur-fast) ease; }
.ip-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-soft); }
.ip-hex { font-weight: 700; font-size: .85rem; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.ip-share { font-size: .75rem; opacity: .85; }
.ip-bar { display: block; height: 4px; border-radius: var(--radius-sm); background: rgba(127, 127, 127, .35); margin-top: .35rem; overflow: hidden; }
.ip-bar > i { display: block; height: 100%; border-radius: var(--radius-sm); background: currentColor; opacity: .8; }
.ip-empty { color: var(--color-muted-text); font-size: .9rem; grid-column: 1 / -1; }

/* 命名色查找 nearest-color */
.nc-best { display: grid; grid-template-columns: auto 1fr; gap: 1rem; align-items: center; margin-top: 1rem; padding: 1rem; background: var(--color-background); border: 1px solid var(--color-border); border-radius: var(--radius-md); }
.nc-best-swatches { display: flex; gap: .5rem; }
.nc-swatch { width: 64px; height: 64px; border-radius: var(--radius-sm); border: 1px solid var(--color-border); }
.nc-best-info b { font-size: 1.15rem; }
.nc-best-info > span { color: var(--color-muted-text); margin-left: .4rem; font-size: .9rem; }
.nc-best-info p { color: var(--color-muted-text); font-size: .85rem; margin: .3rem 0 .6rem; }
@media (max-width: 640px) { .nc-best { grid-template-columns: 1fr; } }
.nc-list { display: flex; flex-direction: column; gap: .45rem; margin-top: 1rem; }
.nc-item { display: grid; grid-template-columns: 40px 1fr auto auto; gap: .8rem; align-items: center; width: 100%; text-align: left; background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-sm); padding: .55rem .8rem; cursor: pointer; font: inherit; color: inherit; transition: border-color var(--dur-fast) ease, background var(--dur-fast) ease; }
.nc-item:hover { border-color: var(--color-primary); background: var(--color-code-bg); }
.nc-sw { width: 32px; height: 32px; border-radius: var(--radius-sm); border: 1px solid var(--color-border); }
.nc-name b { font-size: .95rem; }
.nc-name i { font-style: normal; color: var(--color-muted-text); font-size: .8rem; margin-left: .45rem; }
.nc-meta { color: var(--color-muted-text); font-size: .82rem; font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; }
.nc-de { font-size: .82rem; font-weight: 700; color: var(--color-primary); min-width: 4.5rem; text-align: right; }
.nc-example-link { color: var(--color-primary); }

/* ---------- 标准 About 页面组件 ---------- */
.section { padding: 1.5rem 0; }
.section.hero { padding: 2rem 0 1rem; }
.eyebrow {
  display: inline-block; margin-bottom: 6px; padding: 3px 10px;
  border-radius: var(--radius-pill); background: var(--color-accent-soft, rgba(36,87,214,.1));
  color: var(--color-accent); font-size: 0.75rem; font-weight: 600; letter-spacing: 0.02em;
}
.section-head { margin-bottom: 14px; }
.section-head h2 { font-size: 1.3rem; margin: 0 0 4px; }
.section-head.left { text-align: left; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
.card-icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; margin-bottom: 10px; border-radius: var(--radius-sm);
  background: var(--color-accent-soft, rgba(36,87,214,.1)); font-size: 1.2rem;
}
.btn-primary {
  background: var(--color-accent); border-color: var(--color-accent);
  color: var(--color-on-accent); box-shadow: 0 2px 8px rgba(36,87,214,.22);
}
.btn-primary:hover { filter: brightness(1.05); }
.btn-row.center { justify-content: center; }
.faq-list { display: grid; gap: 10px; }
details.faq { border: 1px solid var(--color-border); border-radius: var(--radius-lg); background: var(--color-surface); overflow: hidden; }
details.faq summary { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 16px; font-weight: 600; cursor: pointer; list-style: none; }
details.faq summary::-webkit-details-marker { display: none; }
details.faq summary::after { content: "+"; color: var(--color-accent); font-size: 1.25rem; font-weight: 700; }
details.faq[open] summary::after { content: "\2212"; }
.faq-body { padding: 0 16px 14px; color: var(--color-muted-text); font-size: 0.9rem; line-height: 1.7; }
.cta-band {
  margin: 28px 0; padding: 2rem 1.5rem;
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); text-align: center;
}
.cta-band h2 { margin-bottom: 6px; }
.cta-band p { color: var(--color-muted-text); font-size: 0.9rem; margin-top: 4px; }
@media (max-width: 768px) { .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 480px) { .grid-3 { grid-template-columns: minmax(0, 1fr); } }