/* ==========================================================================
   AI Workout Planner — 全站设计系统（唯一样式文件，所有页面必须引用）
   移动优先 · 断点 480 / 768 / 1024 / 1440 · 375px 下无横向滚动

   【图片约定】所有实物照片一律使用图片生成接口：
   图片使用 Unsplash 真实照片直链：https://images.unsplash.com/photo-<id>?auto=format&fit=crop&w=1600&h=900&q=80
   禁止占位图 / 纯色块 / 纯图标卡片。
   .photo-card 的用法：inline style 只写 background-image:url(生成接口地址)，
   深色渐变遮罩由 .photo-card::before 自动叠加，文字自动为白色。
   ========================================================================== */

:root {
  --primary: #FF6B35;
  --primary-dark: #E8541F;
  --primary-light: #FFF1EA;
  --text: #20242E;
  --text-muted: #606A78;
  --bg: #F7F7F8;
  --card: #FFFFFF;
  --border: #E7E8EC;
  --radius: 12px;
  --shadow-sm: 0 1px 3px rgba(16, 24, 40, .08);
  --shadow-md: 0 8px 24px rgba(16, 24, 40, .12);
  --header-h: 64px;
  --container: 1200px;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  padding-top: var(--header-h); /* 固定顶栏占位 */
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial,
               "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 .5em; font-weight: 800; }
h1 { font-size: 1.9rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
button { font: inherit; }

.container { max-width: var(--container); margin: 0 auto; padding: 0 16px; }
.section { padding: 40px 0; }
.section-head { margin-bottom: 24px; }
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; /* 触控目标 ≥44px */
  padding: 10px 22px;
  border: 2px solid transparent; border-radius: 10px;
  font-weight: 700; cursor: pointer;
  background: #fff; color: var(--text);
  transition: background .15s, border-color .15s, color .15s, transform .1s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-outline { background: transparent; border-color: var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary-light); color: var(--primary-dark); }
.btn-block { width: 100%; }

/* ---------- 卡片 ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 20px;
}
a.card { display: block; color: var(--text); transition: box-shadow .15s, transform .15s; }
a.card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); color: var(--text); }

/* 实物照片卡片：背景图 + 深色渐变遮罩 + 白字，高 180–220px */
.photo-card {
  position: relative;
  display: flex; flex-direction: column; justify-content: flex-end;
  height: 200px;
  padding: 18px;
  border-radius: var(--radius);
  overflow: hidden;
  background-size: cover; background-position: center;
  color: #fff;
  box-shadow: var(--shadow-md);
}
.photo-card::before {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0, 0, 0, .05) 35%, rgba(0, 0, 0, .7) 100%);
}
.photo-card > * { position: relative; z-index: 1; }
.photo-card h3, .photo-card p { color: #fff; margin-bottom: .25em; }
.photo-card .badge { background: rgba(255, 255, 255, .22); color: #fff; }

/* ---------- 徽章 ---------- */
.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--primary-light); color: var(--primary-dark);
  font-size: .78rem; font-weight: 700; letter-spacing: .02em;
}

/* ---------- 表单（触控目标 ≥44px） ---------- */
.field { margin-bottom: 18px; }
.field label, .field-label { display: block; font-weight: 700; margin-bottom: 6px; }
input[type="text"], input[type="number"], input[type="email"], input[type="tel"],
select, textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--border); border-radius: 10px;
  background: #fff; color: var(--text);
  font: inherit;
}
input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(255, 107, 53, .18);
}
input[type="radio"], input[type="checkbox"] {
  width: 22px; height: 22px;
  accent-color: var(--primary);
  flex: none;
}
/* 单选/多选大触控行：包一层 label.choice 即可 */
.choice {
  display: flex; align-items: center; gap: 10px;
  min-height: 44px;
  padding: 8px 12px; margin-bottom: 8px;
  border: 1px solid var(--border); border-radius: 10px;
  background: #fff; cursor: pointer;
}
.choice:has(input:checked) { border-color: var(--primary); background: var(--primary-light); }
.form-row { display: grid; gap: 0 16px; }

/* ---------- 结果框 ---------- */
.result-box {
  background: #fff;
  border: 1px solid var(--border);
  border-left: 4px solid var(--primary);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  padding: 20px;
  margin-top: 20px;
}
.result-box .result-value { font-size: 2rem; font-weight: 800; color: var(--primary); line-height: 1.1; }
.result-box .result-label { color: var(--text-muted); font-size: .9rem; }

/* ---------- 响应式表格：包一层 .table-wrap 即可横向滚动 ---------- */
.table-wrap {
  overflow-x: auto;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}
.table { width: 100%; border-collapse: collapse; min-width: 540px; font-size: .95rem; }
.table th, .table td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); }
.table thead th { background: #FAFAFB; font-weight: 700; white-space: nowrap; }
.table tbody tr:last-child td { border-bottom: none; }

/* ---------- 工具网格（自适应） ---------- */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 16px;
}

/* ---------- 收藏按钮（由 assets/js/favorites.js 自动绑定） ---------- */
.fav-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; padding: 0;
  border: none; border-radius: 50%;
  background: rgba(255, 255, 255, .92);
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  color: #B9BFC9;
}
.fav-btn::before { content: "\2665"; font-size: 20px; line-height: 1; }
.fav-btn.is-fav { color: var(--primary); }
.photo-card .fav-btn { position: absolute; top: 10px; right: 10px; z-index: 2; }

/* ---------- 头部（固定顶栏） ---------- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-h);
  background: rgba(255, 255, 255, .96);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.header-inner { display: flex; align-items: center; justify-content: space-between; gap: 12px; height: var(--header-h); }
.logo { font-size: 1.15rem; font-weight: 800; color: var(--text); white-space: nowrap; }
.logo span { color: var(--primary); }
.main-nav { display: flex; align-items: center; gap: 2px; }
.main-nav a { padding: 8px 12px; border-radius: 8px; color: var(--text); font-weight: 600; font-size: .95rem; }
.main-nav a:hover { background: var(--bg); color: var(--text); }
.main-nav a.active { color: var(--primary); background: var(--primary-light); }
.lang-toggle {
  margin-left: 8px;
  min-height: 40px; min-width: 56px;
  padding: 6px 14px;
  border: 1px solid var(--border); border-radius: 999px;
  background: #fff; color: var(--text);
  font-weight: 700; cursor: pointer;
}
.lang-toggle:hover { border-color: var(--primary); color: var(--primary); }
.hamburger {
  display: none;
  width: 44px; height: 44px;
  border: none; background: transparent; cursor: pointer;
  flex-direction: column; align-items: center; justify-content: center; gap: 5px;
}
.hamburger span { display: block; width: 22px; height: 2px; background: var(--text); border-radius: 2px; transition: transform .2s, opacity .2s; }
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
body.nav-open { overflow: hidden; }

/* ---------- 页脚（深色多列） ---------- */
.site-footer { margin-top: 56px; background: #171A21; color: #C7CDD6; font-size: .95rem; }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: 28px; padding: 44px 0 28px; }
.site-footer .logo { color: #fff; }
.footer-col h3 { color: #fff; font-size: 1rem; margin-bottom: 12px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col li { margin-bottom: 8px; }
.site-footer a { color: #C7CDD6; }
.site-footer a:hover { color: var(--primary); }
.footer-bottom { border-top: 1px solid rgba(255, 255, 255, .12); padding: 18px 0 22px; text-align: center; font-size: .85rem; }
.footer-bottom .disclaimer { color: #98A1AD; max-width: 760px; margin: 0 auto 8px; }
.footer-bottom p { margin-bottom: 4px; }

/* ---------- 断点：480 / 768 / 1024 / 1440 ---------- */
@media (min-width: 480px) {
  .form-row { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 768px) {
  h1 { font-size: 2.4rem; }
  h2 { font-size: 1.8rem; }
  .container { padding: 0 24px; }
  .section { padding: 56px 0; }
  .photo-card { height: 220px; }
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; gap: 40px; }
}
/* 移动端：<768px 导航折叠为全屏抽屉 */
@media (max-width: 767px) {
  .hamburger { display: inline-flex; }
  .main-nav {
    position: fixed;
    top: var(--header-h); left: 0; right: 0; bottom: 0;
    z-index: 999;
    flex-direction: column; align-items: stretch; gap: 6px;
    background: #fff;
    padding: 20px 16px;
    border-top: 1px solid var(--border);
    transform: translateX(100%);
    transition: transform .25s ease;
    overflow-y: auto;
  }
  .main-nav.open { transform: none; }
  .main-nav a { font-size: 1.05rem; padding: 14px 16px; }
  .lang-toggle { margin: 12px 0 0; align-self: flex-start; min-height: 44px; }
}
@media (min-width: 1024px) {
  .container { padding: 0 32px; }
  .section { padding: 64px 0; }
}
@media (min-width: 1440px) {
  .section { padding: 72px 0; }
}

/* ---------- 打印样式：隐藏 header / footer / 按钮 ---------- */
@media print {
  .site-header, .site-footer,
  .btn, .fav-btn, .hamburger, .lang-toggle { display: none !important; }
  body { padding-top: 0; background: #fff; color: #000; }
  .card, .result-box, .table-wrap { box-shadow: none; border-color: #bbb; }
  a { color: #000; }
}