/* ==========================================================================
   SBALT 官網共用設計系統
   黑底白字骨架 · 橘色 (#F97316) 限用於 accent · 系統字體 · 零 emoji
   對齊 App 內 constants/theme.ts 的視覺語言
   ========================================================================== */

:root {
  --bg:            #0A0A0A;
  --surface:       #141414;
  --surface-2:     #1A1A1A;
  --border:        #262626;
  --border-soft:   #1F1F1F;
  --text:          #F5F5F5;
  --text-2:        #9CA3AF;
  --text-3:        #6B7280;
  --brand:         #F97316;
  --brand-soft:    rgba(249, 115, 22, 0.12);
  --radius:        16px;
  --radius-lg:     24px;
  --radius-pill:   999px;
  --maxw:          1080px;
  --maxw-doc:      720px;
  --ease:          cubic-bezier(0.16, 1, 0.3, 1);
  --font: -apple-system, BlinkMacSystemFont, 'PingFang TC', 'Microsoft JhengHei', 'Noto Sans TC', sans-serif;
}

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

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

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

a { color: inherit; }

::selection { background: var(--brand); color: #0A0A0A; }

/* ---------- 頂部導覽列 ---------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  background: rgba(10, 10, 10, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-soft);
}
.nav-inner {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  height: 26px;
  width: auto;
  display: block;
  mix-blend-mode: lighten;
}
.nav-links { display: flex; gap: 28px; align-items: center; }
.nav-links a {
  font-size: 14px;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.nav-links a:hover { color: var(--text); }

/* ---------- 通用容器 ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.wrap-doc { max-width: var(--maxw-doc); margin: 0 auto; padding: 0 24px; }

/* ---------- 區段標題小標 ---------- */
.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--brand);
  margin-bottom: 16px;
}

/* ---------- 按鈕 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--text);
  color: #0A0A0A;
  padding: 15px 32px;
  border-radius: var(--radius-pill);
  font-size: 16px;
  font-weight: 700;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform 0.15s var(--ease), opacity 0.2s var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: scale(0.98); }
.btn[aria-disabled="true"] {
  background: var(--surface-2);
  color: var(--text-2);
  border: 1px solid var(--border);
  cursor: default;
}
.btn[aria-disabled="true"]:hover { transform: none; }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.card:hover { border-color: #333; transform: translateY(-2px); }

/* ---------- 頁尾 ---------- */
.footer {
  border-top: 1px solid var(--border);
  margin-top: 96px;
  padding: 40px 24px 56px;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.footer-brand { display: flex; align-items: center; gap: 12px; }
.footer-logo { height: 20px; width: auto; mix-blend-mode: lighten; }
.footer-copy { font-size: 13px; color: var(--text-3); }
.footer-links { display: flex; flex-wrap: wrap; gap: 20px; }
.footer-links a {
  font-size: 13px;
  color: var(--text-2);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}
.footer-links a:hover { color: var(--text); }

/* ==========================================================================
   法律 / 文件頁排版（privacy / terms / account-deletion 共用）
   ========================================================================== */
.doc {
  padding: 56px 0 24px;
}
.doc h1 {
  font-size: clamp(28px, 5vw, 36px);
  font-weight: 900;
  letter-spacing: -0.8px;
  line-height: 1.15;
  margin-bottom: 8px;
}
.doc .updated { color: var(--text-3); font-size: 14px; margin-bottom: 4px; }
.doc .lead { color: var(--text-2); font-size: 16px; margin: 20px 0; }
.doc h2 {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.3px;
  margin: 48px 0 12px;
  padding-top: 8px;
}
.doc h3 {
  font-size: 16px;
  font-weight: 700;
  color: #E5E7EB;
  margin: 28px 0 8px;
}
.doc p { margin: 12px 0; color: #D1D5DB; }
.doc ul, .doc ol { margin: 12px 0 12px 22px; color: #D1D5DB; }
.doc li { margin: 7px 0; }
.doc strong { color: var(--text); font-weight: 700; }
.doc hr { border: none; border-top: 1px solid var(--border); margin: 28px 0; }
.doc a { color: var(--brand); text-decoration: none; }
.doc a:hover { text-decoration: underline; }
.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  font-size: 15px;
}
.doc th, .doc td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  color: #D1D5DB;
  vertical-align: top;
}
.doc th { color: var(--text); font-weight: 700; }
.doc blockquote {
  background: var(--surface);
  border-left: 3px solid var(--brand);
  border-radius: 0 8px 8px 0;
  padding: 16px 20px;
  margin: 20px 0;
  color: #D1D5DB;
}
.doc blockquote strong { color: var(--text); }

/* 回首頁返回鏈 */
.backlink {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-2);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s var(--ease);
}
.backlink:hover { color: var(--text); }

/* ---------- 進場動畫（尊重 reduce-motion） ---------- */
@media (prefers-reduced-motion: no-preference) {
  .reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  }
  .reveal.in { opacity: 1; transform: none; }
}

/* ---------- RWD ---------- */
@media (max-width: 720px) {
  .nav { padding: 14px 18px; }
  .nav-links { gap: 18px; }
  .nav-links a { font-size: 13px; }
  .wrap, .wrap-doc { padding: 0 18px; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}