/* ===========================================================
   ConcreteCalc Tool Pro - 产品官网
   全局样式 / 响应式 / 移动端 / 暗色模式
   =========================================================== */

* { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #1976D2;
  --primary-dark: #1565C0;
  --primary-light: #E3F2FD;
  --accent: #FF6F00;
  --text: #1A1A2E;
  --text-sub: #555566;
  --text-mute: #888;
  --bg: #F5F7FA;
  --bg-elevated: #FFFFFF;
  --border: #E0E4EC;
  --border-soft: #F0F0F5;
  --success: #2E7D32;
  --warning: #E65100;
  --danger: #C62828;
  --radius: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
  --shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.10);
  --max-width: 1120px;
  --header-h: 64px;
  --scroll-anchor-offset: 80px;  /* topbar 高 + 缓冲，锚点跳转不被遮挡 */
}

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "Segoe UI",
               "Hiragino Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
}

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

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ====== 顶部导航栏 ====== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border-soft);
  height: var(--header-h);
}
.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.2px;
  text-decoration: none;
  flex-shrink: 0;
}
.brand:hover { text-decoration: none; }
.brand__icon {
  width: 36px; height: 36px; border-radius: 8px;
  box-shadow: var(--shadow-sm);
}
.brand__name { display: none; }
@media (min-width: 480px) { .brand__name { display: inline; } }

.nav-main {
  display: none;
  gap: 22px;
  margin-left: auto;
  font-size: 14px;
}
@media (min-width: 768px) { .nav-main { display: flex; } }
.nav-main a {
  color: var(--text-sub);
  font-weight: 500;
  text-decoration: none;
  padding: 4px 0;
}
.nav-main a:hover { color: var(--primary); text-decoration: none; }
.nav-main a.is-active { color: var(--primary); font-weight: 700; }

.lang-select-wrap {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 6px;
}
@media (min-width: 768px) { .lang-select-wrap { margin-left: 0; } }
.lang-select {
  appearance: none;
  -webkit-appearance: none;
  background: var(--bg-elevated) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path d='M0 0l5 6 5-6z' fill='%23888'/></svg>") no-repeat right 10px center;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 26px 6px 12px;
  font-size: 14px;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  font-weight: 500;
  transition: border-color 0.15s;
}
.lang-select:hover { border-color: var(--primary); }
.lang-select:focus { outline: 2px solid var(--primary-light); border-color: var(--primary); }

/* ====== 容器 ====== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}
.container--narrow { max-width: 800px; }

/* ====== 英雄区 ====== */
.hero {
  padding: 48px 0 32px;
  text-align: center;
}
@media (min-width: 768px) {
  .hero { padding: 80px 0 56px; }
}
.hero__badge {
  display: inline-block;
  background: var(--primary-light);
  color: var(--primary-dark);
  padding: 5px 14px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 18px;
}
.hero__icon {
  width: 100px;
  height: 100px;
  border-radius: 22px;
  box-shadow: var(--shadow-lg);
  margin: 0 auto 20px;
}
@media (min-width: 768px) {
  .hero__icon { width: 128px; height: 128px; border-radius: 28px; }
}
.hero__title {
  font-size: 28px;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
}
@media (min-width: 768px) {
  .hero__title { font-size: 42px; }
}
.hero__sub {
  font-size: 16px;
  color: var(--text-sub);
  line-height: 1.6;
  max-width: 620px;
  margin: 0 auto 16px;
}
@media (min-width: 768px) {
  .hero__sub { font-size: 18px; }
}
.hero__meta {
  font-size: 13px;
  color: var(--text-mute);
  margin-bottom: 24px;
}
.hero__actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

/* ====== 通用按钮 ====== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: 0;
  cursor: pointer;
  font-family: inherit;
  transition: transform 0.15s, background 0.15s, box-shadow 0.15s;
  line-height: 1.2;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: scale(0.97); }
.btn--primary { background: var(--primary); color: #fff; }
.btn--primary:hover { background: var(--primary-dark); color: #fff; box-shadow: var(--shadow); }
.btn--secondary { background: var(--bg-elevated); color: var(--text); border: 1px solid var(--border); }
.btn--secondary:hover { border-color: var(--primary); color: var(--primary); }
.btn--appstore { padding: 10px 22px; }

/* ====== App Store 按钮（CSS 重现官方样式） ====== */
.appstore-btn {
  display: inline-block;
  background: transparent;
  text-decoration: none !important;
  transition: transform 0.15s, opacity 0.15s;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.15);
  line-height: 0;
}
.appstore-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25); }
.appstore-btn:active { transform: scale(0.98); }
.appstore-btn svg { display: block; }

.appstore {
  text-align: center;
  margin: 4px 0 8px;
}

/* ====== 卡片 ====== */
.card {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 20px;
  margin-bottom: 16px;
  box-shadow: var(--shadow);
  scroll-margin-top: var(--scroll-anchor-offset);
}
@media (min-width: 768px) { .card { padding: 28px; } }
.card__title {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 14px;
  display: flex;
  align-items: center;
  gap: 8px;
}
@media (min-width: 768px) { .card__title { font-size: 20px; } }
.card__title-icon { font-size: 22px; line-height: 1; }

/* ====== 模块标题（大段区块用） ====== */
.section {
  padding: 40px 0;
}
@media (min-width: 768px) { .section { padding: 64px 0; } }
.section__head { text-align: center; margin-bottom: 32px; }
.section__eyebrow {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.2px;
  color: var(--primary);
  text-transform: uppercase;
  margin-bottom: 8px;
}
.section__title {
  font-size: 24px;
  font-weight: 800;
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}
@media (min-width: 768px) { .section__title { font-size: 32px; } }
.section__sub {
  font-size: 15px;
  color: var(--text-sub);
  max-width: 620px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ====== 产品功能网格 ====== */
.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}
@media (min-width: 600px) { .feature-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .feature-grid { grid-template-columns: repeat(3, 1fr); } }
.feature {
  background: var(--bg-elevated);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow);
  border: 1px solid var(--border-soft);
  transition: transform 0.2s, box-shadow 0.2s;
}
.feature:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.feature__icon {
  font-size: 32px;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-light);
  border-radius: 12px;
  margin-bottom: 14px;
}
.feature__title { font-size: 17px; font-weight: 700; margin-bottom: 6px; }
.feature__desc { font-size: 14px; color: var(--text-sub); line-height: 1.6; }

/* ====== 产品截图轮播 / 网格 ====== */
.screenshots {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  max-width: 900px;
  margin: 0 auto;
}
@media (min-width: 600px) { .screenshots { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 900px) { .screenshots { grid-template-columns: repeat(6, 1fr); } }
.screenshot {
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #000;
  aspect-ratio: 9/19.5;
}
.screenshot img { width: 100%; height: 100%; object-fit: cover; }

/* ====== 联系信息 ====== */
.contact-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  border-bottom: 1px solid var(--border-soft);
  font-size: 15px;
  flex-wrap: wrap;
  gap: 8px;
}
.contact-row:last-child { border-bottom: none; }
.contact-row__label { color: var(--text-mute); flex-shrink: 0; }
.contact-row__value { color: var(--text); font-weight: 500; text-align: right; word-break: break-all; }
.contact-row__value a { font-weight: 600; }

/* ====== FAQ ====== */
.faq-item {
  padding: 16px 0;
  border-bottom: 1px solid var(--border-soft);
}
.faq-item:last-child { border-bottom: none; }
.faq-q {
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  font-size: 15px;
  display: flex;
  gap: 10px;
  align-items: flex-start;
}
.faq-q::before {
  content: "Q";
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--primary);
  color: #fff;
  font-size: 12px;
  font-weight: 800;
  flex-shrink: 0;
  margin-top: 1px;
}
.faq-a {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.75;
  padding-left: 34px;
}

/* ====== 更新日志 ====== */
.changelog-item {
  padding: 14px 0;
  border-bottom: 1px solid var(--border-soft);
}
.changelog-item:last-child { border-bottom: none; }
.changelog-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 6px;
  flex-wrap: wrap;
  gap: 6px;
}
.changelog-version {
  font-weight: 700;
  color: var(--primary);
  font-size: 15px;
}
.changelog-date {
  font-size: 13px;
  color: var(--text-mute);
}
.changelog-content {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.65;
}

/* ====== 隐私页段落 ====== */
.privacy-section { margin-bottom: 24px; }
.privacy-section h2 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--primary-dark);
  border-left: 4px solid var(--primary);
  padding-left: 10px;
}
.privacy-section p,
.privacy-section li {
  color: var(--text-sub);
  font-size: 14px;
  line-height: 1.8;
  margin-bottom: 8px;
}
.privacy-section ul { padding-left: 22px; margin-bottom: 8px; }
.privacy-section li { margin-bottom: 4px; }
.privacy-section strong { color: var(--text); }
.privacy-highlight {
  background: #FFF8E1;
  border: 1px solid #FFE082;
  border-radius: 10px;
  padding: 14px 16px;
  color: var(--text);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 12px;
  font-weight: 500;
}

/* ====== CTA 区域 ====== */
.cta {
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: var(--radius-xl);
  padding: 32px 24px;
  text-align: center;
  margin: 24px 0;
  box-shadow: var(--shadow-lg);
}
@media (min-width: 768px) { .cta { padding: 48px 32px; } }
.cta__title { font-size: 24px; font-weight: 800; margin-bottom: 8px; }
@media (min-width: 768px) { .cta__title { font-size: 32px; } }
.cta__sub { font-size: 15px; opacity: 0.92; margin-bottom: 20px; max-width: 520px; margin-left: auto; margin-right: auto; }
.cta__btn {
  background: #fff;
  color: var(--primary);
  padding: 12px 28px;
  font-size: 15px;
  font-weight: 700;
  border-radius: 10px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: transform 0.15s, background 0.15s;
}
.cta__btn:hover { background: #f5f5f5; color: var(--primary-dark); text-decoration: none; transform: translateY(-2px); }

/* ====== 页脚 ====== */
.site-footer {
  border-top: 1px solid var(--border-soft);
  padding: 32px 0 24px;
  margin-top: 40px;
}
.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  text-align: center;
  color: var(--text-mute);
  font-size: 13px;
  line-height: 1.7;
}
@media (min-width: 600px) {
  .site-footer__inner { flex-direction: row; justify-content: space-between; text-align: left; }
}
.site-footer__links { display: flex; gap: 18px; justify-content: center; flex-wrap: wrap; }
.site-footer__links a { color: var(--text-mute); text-decoration: none; }
.site-footer__links a:hover { color: var(--primary); }
.site-footer__sep { color: var(--border); }

/* ====== 暗色模式 ====== */
@media (prefers-color-scheme: dark) {
  :root {
    --text: #F0F0F5;
    --text-sub: #B8B8C8;
    --text-mute: #888;
    --bg: #12121A;
    --bg-elevated: #1E1E2A;
    --border: #2A2A38;
    --border-soft: #252535;
    --primary-light: #1A2A40;
  }
  .site-header {
    background: rgba(30, 30, 42, 0.92);
  }
  .privacy-highlight {
    background: #2A2418;
    border-color: #4A3E1E;
  }
  .feature {
    border-color: var(--border);
  }
}

/* ====== 顶部导航条 ====== */
.topbar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  -webkit-backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border-soft);
}
.topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 16px;
}
.topbar__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--text);
  font-weight: 800;
  font-size: 18px;
  flex-shrink: 0;
}
.topbar__logo { width: 32px; height: 32px; display: block; }
.topbar__name { letter-spacing: -0.3px; }
.topbar__name--accent { color: var(--primary); margin-left: 2px; }
.topbar__nav {
  display: none;
  gap: 24px;
  flex: 1;
  justify-content: center;
}
.topbar__nav a {
  color: var(--text-sub);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  padding: 6px 2px;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}
.topbar__nav a:hover { color: var(--primary); }
.topbar__nav a.is-active {
  color: var(--primary);
  border-bottom-color: var(--primary);
  font-weight: 700;
}
.topbar__lang {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-shrink: 0;
}
.topbar__lang-icon { font-size: 16px; line-height: 1; }
.lang-select {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 14px;
  color: var(--text);
  cursor: pointer;
  font-family: inherit;
  appearance: none;
  -webkit-appearance: none;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'><path fill='%23555' d='M0 0l5 6 5-6z'/></svg>");
  background-repeat: no-repeat;
  background-position: right 8px center;
  padding-right: 24px;
}
.lang-select:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}
@media (min-width: 720px) {
  .topbar__nav { display: flex; }
}

/* ====== Hero / Banner ====== */
.hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
  padding: 48px 0 32px;
}
.hero--compact {
  display: block;
  padding: 32px 0 16px;
  text-align: center;
}
.hero__left { display: flex; flex-direction: column; }
.hero__right {
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero__eyebrow {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 1.5px;
  font-weight: 700;
  color: var(--primary);
  background: var(--primary-light);
  padding: 6px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
  width: max-content;
}
.hero__title {
  font-size: 36px;
  font-weight: 800;
  line-height: 1.15;
  color: var(--text);
  letter-spacing: -0.5px;
  margin-bottom: 12px;
}
.hero__title--accent { color: var(--primary); }
.hero__sub {
  font-size: 17px;
  color: var(--text-sub);
  line-height: 1.6;
  margin-bottom: 20px;
  max-width: 540px;
}
.hero__cta { margin: 8px 0 20px; }
.hero__bullets {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.hero__bullets li {
  display: flex;
  gap: 10px;
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.5;
}
.hero__bullets li > span:first-child {
  color: var(--success);
  font-weight: 800;
  flex-shrink: 0;
}
.hero__shot { display: none; } /* 旧版（已弃用），保留防泄漏 */
.hero__stack { display: none; } /* 旧版（已弃用），保留防泄漏 */

/* Hero 拼接图：3 张截图山字形倾斜拼接（尺寸由 montage.py 随机生成，典型 ~1300x760） */
.hero__montage {
  display: block;
  width: 100%;
  max-width: 640px;          /* 桌面端最大宽度（≈ 1300 的 50%） */
  height: auto;
  border-radius: 24px;
  box-shadow: var(--shadow-lg);
  background: var(--bg);
}

/* 三张截图山字形叠加（旧方案，已被横向拼接图替代） */
.phone-stack { display: none; }
@media (min-width: 820px) {
  .hero { grid-template-columns: 1.1fr 0.9fr; padding: 32px 0 48px; }
  .hero__title { font-size: 48px; }
  .hero__sub { font-size: 18px; }
}

/* ====== 产品介绍卡 ====== */
.intro .lead {
  font-size: 15px;
  line-height: 1.75;
  color: var(--text-sub);
  margin: 0;
}
.intro p strong { color: var(--text); }

/* ====== 截图网格 ====== */
/* 默认 2 列（手机） */
.shots__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
/* 自适应列数：1~6 张在桌面上一行展示 */
/* 1 张 → 占满整行（max-width 280px） */
.shots__grid[data-count="1"] { grid-template-columns: minmax(0, 280px); justify-content: center; }
/* 2~3 张 → 2/3 列 */
.shots__grid[data-count="2"] { grid-template-columns: repeat(2, 1fr); max-width: 600px; margin: 0 auto; }
.shots__grid[data-count="3"] { grid-template-columns: repeat(3, 1fr); }
/* 4~6 张 → 一行 N 列 */
.shots__grid[data-count="4"] { grid-template-columns: repeat(4, 1fr); }
.shots__grid[data-count="5"] { grid-template-columns: repeat(5, 1fr); }
.shots__grid[data-count="6"] { grid-template-columns: repeat(6, 1fr); }
.shots__grid a {
  display: block;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg);
  transition: transform 0.2s, box-shadow 0.2s;
}
.shots__grid a:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.shots__grid img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 1242 / 2688;
  object-fit: cover;
}
@media (max-width: 480px) {
  /* 手机小屏：3+ 张时缩为 2 列 */
  .shots__grid[data-count="3"],
  .shots__grid[data-count="4"],
  .shots__grid[data-count="5"],
  .shots__grid[data-count="6"] { grid-template-columns: repeat(2, 1fr); }
}

/* ====== 页脚 ====== */
.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 24px 0;
  text-align: center;
}
.footer__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 8px;
  font-size: 14px;
}
.footer__links a { color: var(--text-sub); text-decoration: none; }
.footer__links a:hover { color: var(--primary); }
.footer__sep { color: var(--text-mute); }
.footer__copy { font-size: 12px; color: var(--text-mute); }

/* ====== FAQ 直接展开版（无折叠） ====== */
.faq-item {
  padding: 16px 0;
  border-top: 1px solid var(--border-soft);
}
.faq-item:last-child { border-bottom: 1px solid var(--border-soft); }
.faq-q {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
  margin: 0 0 8px;
  letter-spacing: -0.2px;
}
.faq-a {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
}
.faq-a a { color: var(--primary); }

/* ====== 使用技巧（编号 + 标题 + 描述） ====== */
.tips {
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.tip {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 14px;
  padding: 14px 16px;
  background: var(--bg);
  border: 1px solid var(--border-soft);
  border-radius: 12px;
  transition: border-color 0.2s, transform 0.2s;
}
.tip:hover { border-color: var(--primary); transform: translateY(-1px); }
.tip__num {
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #fff;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  font-weight: 800;
  flex-shrink: 0;
}
.tip__body { min-width: 0; }
.tip__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin: 2px 0 6px;
}
.tip__desc {
  font-size: 13.5px;
  color: var(--text-sub);
  line-height: 1.6;
  margin: 0;
}

/* ====== 计算示例（场景式） ====== */
.example {
  padding: 16px 0;
  border-top: 1px solid var(--border-soft);
}
.example:first-child { border-top: none; padding-top: 4px; }
.example__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--primary);
  margin: 0 0 8px;
  letter-spacing: -0.2px;
}
.example__body {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.75;
  margin: 0;
}

/* ====== 技术规格（分组式） ====== */
.spec {
  padding: 14px 0;
  border-top: 1px solid var(--border-soft);
}
.spec:first-child { border-top: none; padding-top: 4px; }
.spec__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
  margin: 0 0 6px;
}
.spec__body {
  font-size: 14px;
  color: var(--text-sub);
  line-height: 1.7;
  margin: 0;
}

/* ====== Contact 行 ====== */
.contact-hint {
  font-size: 13px;
  color: var(--text-mute);
  margin-top: 10px;
  line-height: 1.6;
}
.contact-row__value a { color: var(--primary); text-decoration: none; word-break: break-all; }
.contact-row__value a:hover { text-decoration: underline; }

/* ====== Changelog 条目 ====== */
.changelog-item {
  padding: 14px 0;
  border-top: 1px solid var(--border-soft);
}
.changelog-item:first-child { border-top: none; }
.changelog-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 6px;
}
.changelog-ver {
  background: var(--primary);
  color: #fff;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}
.changelog-date { font-size: 12px; color: var(--text-mute); }
.changelog-body { font-size: 14px; color: var(--text-sub); line-height: 1.6; }

/* ====== 兼容性修复：feature__name (lang.js 用) ====== */
.feature__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}

/* ====== 打印 ====== */
@media print {
  .site-header, .site-footer, .cta, .lang-select-wrap, .appstore, .topbar { display: none; }
  body { background: #fff; color: #000; }
}