/* 新竹台大小兒部學習網 — 零框架純 CSS */
:root {
  --primary: #0f766e;
  --primary-dark: #115e59;
  --primary-light: #ccfbf1;
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --muted: #64748b;
  --border: #e2e8f0;
  --warn-bg: #fef2f2;
  --warn-border: #fca5a5;
  --warn-text: #b91c1c;
  --demo-bg: #fef9c3;
  --demo-text: #854d0e;
  --radius: 12px;
  --shadow: 0 1px 3px rgba(15, 23, 42, .08), 0 4px 12px rgba(15, 23, 42, .05);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

/* ---------- 導覽列 ---------- */
.topbar {
  background: var(--primary);
  color: #fff;
  padding: 0 16px;
  position: sticky;
  top: 0;
  z-index: 20;
  box-shadow: var(--shadow);
}
.topbar-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  padding: 10px 0;
}
.brand {
  font-weight: 700;
  font-size: 1.05rem;
  margin-right: 12px;
  white-space: nowrap;
}
.brand small { display: block; font-weight: 400; font-size: .7rem; opacity: .85; }
.nav { display: flex; gap: 4px; flex-wrap: wrap; }
.nav a {
  color: rgba(255, 255, 255, .85);
  text-decoration: none;
  padding: 6px 12px;
  border-radius: 8px;
  font-size: .92rem;
  white-space: nowrap;
}
.nav a:hover { background: rgba(255, 255, 255, .12); color: #fff; }
.nav a.active { background: rgba(255, 255, 255, .2); color: #fff; font-weight: 600; }

/* ---------- 版面 ---------- */
.container { max-width: 1080px; margin: 0 auto; padding: 24px 16px 64px; }
.page-title { font-size: 1.5rem; margin-bottom: 4px; color: var(--primary-dark); }
.page-desc { color: var(--muted); font-size: .92rem; margin-bottom: 20px; }

/* ---------- 卡片 ---------- */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
}
.card h3 { font-size: 1.05rem; margin-bottom: 6px; color: var(--primary-dark); }
.card .meta { font-size: .8rem; color: var(--muted); margin-bottom: 8px; }
.card .summary { font-size: .9rem; }
.card-actions { margin-top: 12px; display: flex; gap: 8px; flex-wrap: wrap; }

/* 標籤 */
.tag, .cat {
  display: inline-block;
  font-size: .72rem;
  padding: 2px 9px;
  border-radius: 99px;
  margin-right: 4px;
}
.cat { background: var(--primary-light); color: var(--primary-dark); font-weight: 600; }
.tag { background: #f1f5f9; color: var(--muted); }
.badge-demo {
  display: inline-block;
  font-size: .7rem;
  padding: 2px 8px;
  border-radius: 99px;
  background: var(--demo-bg);
  color: var(--demo-text);
  font-weight: 600;
  margin-left: 6px;
  vertical-align: 2px;
}

/* 按鈕 */
.btn {
  display: inline-block;
  border: none;
  cursor: pointer;
  font-size: .85rem;
  padding: 7px 14px;
  border-radius: 8px;
  text-decoration: none;
  font-family: inherit;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: #fff; color: var(--primary-dark); border: 1px solid var(--border); }
.btn-outline:hover { border-color: var(--primary); }
.btn-disabled { background: #f1f5f9; color: #94a3b8; cursor: not-allowed; }

/* ---------- 篩選列 ---------- */
.filterbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; align-items: center; }
.filterbar input[type="search"] {
  flex: 1;
  min-width: 200px;
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .92rem;
  font-family: inherit;
}
.filterbar select {
  padding: 9px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: .9rem;
  font-family: inherit;
  background: #fff;
}
.chip {
  cursor: pointer;
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 99px;
  padding: 5px 14px;
  font-size: .85rem;
  font-family: inherit;
}
.chip.active { background: var(--primary); border-color: var(--primary); color: #fff; }

/* ---------- 內文（展開閱讀） ---------- */
.article {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 28px;
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}
.article h2 { color: var(--primary-dark); font-size: 1.15rem; margin: 18px 0 8px; }
.article h2:first-child { margin-top: 0; }
.article h3 {
  font-size: 1.05rem;
  color: var(--primary-dark);
  margin: 18px 0 6px;
  padding-left: 10px;
  border-left: 4px solid var(--primary);
}
.article ul, .article ol { padding-left: 1.4em; margin: 6px 0 12px; }
.article li { margin: 3px 0; font-size: .93rem; }
.article p { margin: 8px 0; font-size: .93rem; }
.article blockquote {
  border-left: 4px solid var(--warn-border);
  background: var(--warn-bg);
  padding: 10px 14px;
  border-radius: 0 8px 8px 0;
  font-size: .88rem;
  color: var(--warn-text);
  margin: 10px 0;
}
.article table, .tool table { border-collapse: collapse; width: 100%; margin: 10px 0; font-size: .9rem; }
.article th, .article td, .tool th, .tool td {
  border: 1px solid var(--border);
  padding: 7px 12px;
  text-align: left;
}
.article th, .tool th { background: var(--primary-light); color: var(--primary-dark); }
.tool tbody tr:nth-child(even) { background: #f8fafc; }
code { background: #f1f5f9; padding: 1px 6px; border-radius: 4px; font-size: .85em; }

/* ---------- 警示橫幅 ---------- */
.banner-warn {
  background: var(--warn-bg);
  border: 1px solid var(--warn-border);
  color: var(--warn-text);
  border-radius: var(--radius);
  padding: 12px 16px;
  font-size: .88rem;
  margin-bottom: 18px;
  font-weight: 500;
}

/* ---------- 工具頁 ---------- */
.tool {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 24px;
  box-shadow: var(--shadow);
  margin-bottom: 18px;
}
.tool h2 { color: var(--primary-dark); font-size: 1.1rem; margin-bottom: 12px; }
.tool-inputs { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.tool-inputs label { font-size: .85rem; color: var(--muted); display: block; margin-bottom: 3px; }
.tool-inputs input, .tool-inputs select {
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  font-family: inherit;
  width: 150px;
  background: #fff;
}
.result-box {
  background: var(--primary-light);
  border-radius: 8px;
  padding: 14px 18px;
  font-size: .95rem;
  margin-top: 8px;
}
.result-box .big { font-size: 1.3rem; font-weight: 700; color: var(--primary-dark); }
.hint { font-size: .8rem; color: var(--muted); margin-top: 8px; }

/* ---------- 首頁 ---------- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  border-radius: var(--radius);
  padding: 32px 28px;
  margin-bottom: 24px;
}
.hero h1 { font-size: 1.5rem; margin-bottom: 6px; }
.hero p { opacity: .9; font-size: .95rem; }
.home-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px; margin-bottom: 28px; }
.home-tile {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform .12s ease;
}
.home-tile:hover { transform: translateY(-2px); border-color: var(--primary); }
.home-tile .icon { font-size: 1.6rem; }
.home-tile h3 { color: var(--primary-dark); margin: 6px 0 4px; font-size: 1rem; }
.home-tile p { font-size: .82rem; color: var(--muted); }
.section-title { font-size: 1.1rem; color: var(--primary-dark); margin: 24px 0 12px; }

.empty { color: var(--muted); text-align: center; padding: 40px 0; }
footer { text-align: center; color: var(--muted); font-size: .78rem; padding: 24px 16px; }

@media (max-width: 640px) {
  .article { padding: 18px 16px; }
  .tool-inputs input, .tool-inputs select { width: 120px; }
}