:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-soft: #eef4fb;
  --ink: #18324a;
  --muted: #5c7184;
  --line: #d7e1eb;
  --primary: #2563eb;
  --primary-dark: #1748ab;
  --accent: #f28c28;
  --free: #2f9e44;
  --paid: #f28c28;
  --web: #2563eb;
  --shadow: 0 18px 40px rgba(24, 50, 74, 0.08);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; color: var(--ink); font-family: "Noto Sans TC", "Segoe UI", sans-serif; background: linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%); }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
input, textarea, select { width: 100%; border: 1px solid var(--line); border-radius: 14px; padding: 12px 14px; font: inherit; color: var(--ink); background: var(--surface); }
.site-shell { min-height: 100vh; display: flex; flex-direction: column; }
.container { width: min(1120px, calc(100% - 32px)); margin: 0 auto; }
.site-header { position: sticky; top: 0; z-index: 20; backdrop-filter: blur(14px); background: rgba(248, 251, 255, 0.88); border-bottom: 1px solid rgba(215, 225, 235, 0.9); }
.header-row { min-height: 76px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; flex-direction: column; gap: 4px; }
.brand-mark { font-size: 1.3rem; font-weight: 800; letter-spacing: 0.02em; }
.brand-sub { color: var(--muted); font-size: 0.92rem; }
.nav-toggle { display: none; align-items: center; gap: 8px; border: 1px solid var(--line); background: var(--surface); color: var(--ink); padding: 10px 14px; border-radius: 999px; font: inherit; font-weight: 700; cursor: pointer; }
.nav-toggle-bars, .nav-toggle-bars::before, .nav-toggle-bars::after { display: block; width: 18px; height: 2px; border-radius: 999px; background: currentColor; content: ""; }
.nav-toggle-bars { position: relative; }
.nav-toggle-bars::before, .nav-toggle-bars::after { position: absolute; left: 0; }
.nav-toggle-bars::before { top: -6px; }
.nav-toggle-bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after { top: 0; transform: rotate(-45deg); }
.site-nav { display: flex; align-items: center; gap: 10px; }
.site-nav a { padding: 10px 14px; border-radius: 999px; color: var(--muted); font-weight: 600; }
.site-nav a.is-active, .site-nav a:hover { background: var(--surface); color: var(--primary-dark); box-shadow: var(--shadow); }
.hero { padding: 72px 0 40px; }
.hero-grid { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 28px; align-items: center; }
.hero-copy { min-width: 0; }
.eyebrow { display: inline-block; margin-bottom: 14px; color: var(--primary); letter-spacing: 0.12em; text-transform: uppercase; font-size: 0.8rem; font-weight: 700; }
.hero h1, .section-head h2, .page-hero h1, .book-content-panel h1 { margin: 0 0 16px; line-height: 1.12; font-size: clamp(2.2rem, 5vw, 4.2rem); }
.hero p, .page-hero p, .section-copy, .card p, .book-meta, .info-panel p, .empty-state p, .book-content-panel p, .home-filter-panel p, .hero-stats dd { color: var(--muted); line-height: 1.8; }
.hero-actions, .filter-bar, .cta-row { display: flex; flex-wrap: wrap; gap: 12px; }
.hero-stats { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; margin: 28px 0 0; }
.hero-stats div { padding: 14px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255, 255, 255, 0.72); }
.hero-stats dt { margin: 0 0 2px; color: var(--primary-dark); font-size: 1.55rem; font-weight: 900; }
.hero-stats dd { margin: 0; font-size: 0.92rem; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 48px; padding: 0 18px; border-radius: 999px; font-weight: 700; border: 1px solid transparent; }
.button.compact { min-height: 40px; padding: 0 14px; font-size: 0.92rem; }
.button.primary { background: linear-gradient(135deg, var(--primary), #4a86ff); color: #fff; }
.button.secondary { background: var(--surface); border-color: var(--line); color: var(--ink); }
.hero-panel, .feature-card, .book-card, .info-panel, .page-panel, .filter-shell, .submit-card, .contact-card, .about-card, .book-cover-panel, .book-content-panel { background: var(--surface); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.hero-panel, .feature-card, .info-panel, .page-panel, .submit-card, .contact-card, .about-card, .book-content-panel, .book-cover-panel { padding: 22px; }
.hero-panel img { width: 100%; border-radius: 18px; }
.hero-panel-body { padding-top: 18px; }
.hero-panel-body h2 { margin: 12px 0 8px; font-size: clamp(1.35rem, 2vw, 1.8rem); }
.hero-panel-body p { margin: 0 0 12px; }
.section { padding: 28px 0 56px; }
.section-soft { background: rgba(255, 255, 255, 0.45); border-top: 1px solid rgba(215, 225, 235, 0.55); border-bottom: 1px solid rgba(215, 225, 235, 0.55); }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 20px; }
.section-head h2 { font-size: clamp(1.8rem, 3vw, 2.8rem); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 18px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 18px; }
.book-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.book-card { overflow: hidden; background: var(--surface); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); }
.book-card-media { background: linear-gradient(180deg, #eaf2ff 0%, #d7e8ff 100%); aspect-ratio: 4 / 5; display: flex; align-items: center; justify-content: center; padding: 18px; }
.book-card-media img { max-height: 100%; object-fit: contain; }
.book-card-body { padding: 18px; }
.book-card h3, .feature-card h3, .info-panel h3, .page-panel h3, .submit-card h3, .contact-card h3, .about-card h3 { margin-top: 0; }
.feature-number { display: inline-flex; margin-bottom: 18px; color: var(--accent); font-weight: 900; }
.book-meta { margin: 0 0 14px; font-size: 0.95rem; }
.tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.tag { display: inline-flex; align-items: center; padding: 6px 10px; border-radius: 999px; font-size: 0.82rem; font-weight: 700; }
.tag.free { background: rgba(47, 158, 68, 0.14); color: var(--free); }
.tag.paid { background: rgba(242, 140, 40, 0.14); color: var(--paid); }
.tag.web { background: rgba(37, 99, 235, 0.14); color: var(--web); }
.tag.category { background: var(--surface-soft); color: var(--primary-dark); }
.card-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.card-link { color: var(--primary-dark); font-weight: 700; }
.page-hero { padding: 52px 0 22px; }
.filter-shell { padding: 18px; margin-bottom: 22px; }
.home-filter-panel { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 20px; padding: 16px; border: 1px solid var(--line); border-radius: 24px; background: var(--surface); box-shadow: var(--shadow); }
.home-filter-panel p { margin: 0; flex: 0 0 auto; font-weight: 700; }
.filter-group { display: flex; flex-wrap: wrap; gap: 10px; }
.filter-chip { border: 1px solid var(--line); background: var(--surface); border-radius: 999px; padding: 10px 14px; font: inherit; color: var(--muted); cursor: pointer; }
.filter-chip.is-active, .filter-chip:hover { color: var(--primary-dark); border-color: rgba(37, 99, 235, 0.26); background: rgba(37, 99, 235, 0.08); }
.book-detail { display: grid; grid-template-columns: 320px minmax(0, 1fr); gap: 24px; }
.book-cover-stage { border-radius: 18px; background: linear-gradient(180deg, #eaf2ff 0%, #d6e7fb 100%); padding: 28px; }
.book-summary { margin-bottom: 18px; }
.meta-list { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 24px 0; }
.meta-item { padding: 14px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface-soft); }
.meta-item span { display: block; color: var(--muted); font-size: 0.88rem; margin-bottom: 4px; }
.split-layout { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 20px; }
.rule-list, .flow-list, .contact-list { display: grid; gap: 12px; padding-left: 18px; }
.form-field-wide { display: block; margin-top: 16px; }
.form-actions { margin-top: 16px; }
.footer { margin-top: auto; padding: 24px 0 36px; color: var(--muted); }
.footer-bar { display: flex; align-items: center; justify-content: space-between; gap: 16px; border-top: 1px solid var(--line); padding-top: 18px; }
.empty-state { text-align: center; padding: 36px 20px; background: var(--surface); border: 1px dashed var(--line); border-radius: 24px; }
.admin-layout { display: grid; grid-template-columns: 0.9fr 1.1fr; gap: 20px; align-items: start; }
.admin-panel { background: var(--surface); border: 1px solid var(--line); border-radius: 24px; box-shadow: var(--shadow); padding: 22px; }
.admin-panel-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; margin-bottom: 18px; }
.admin-panel-head h2 { margin: 0; font-size: clamp(1.5rem, 2vw, 2rem); }
.admin-toolbar, .admin-actions, .admin-row-actions { display: flex; flex-wrap: wrap; gap: 10px; }
.admin-form { display: grid; gap: 14px; }
.admin-form label, .json-output-label { display: grid; gap: 8px; color: var(--muted); font-weight: 700; }
.admin-form-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; }
.admin-checks { display: flex; flex-wrap: wrap; gap: 14px; }
.admin-checks label { display: inline-flex; align-items: center; gap: 8px; color: var(--ink); }
.admin-checks input { width: auto; }
.admin-summary { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 16px; }
.admin-summary span { display: inline-flex; padding: 8px 12px; border-radius: 999px; background: var(--surface-soft); color: var(--primary-dark); font-weight: 800; }
.admin-list { display: grid; gap: 12px; margin-bottom: 18px; }
.admin-book-row { display: flex; align-items: center; justify-content: space-between; gap: 14px; padding: 14px; border: 1px solid var(--line); border-radius: 18px; background: #fbfdff; }
.admin-book-row.is-hidden { opacity: 0.72; background: #f7f3ef; }
.admin-book-main { display: flex; align-items: center; gap: 12px; min-width: 0; }
.admin-book-main h3 { margin: 0 0 4px; }
.admin-book-main p { margin: 0; color: var(--muted); }
.admin-order { flex: 0 0 auto; display: inline-grid; place-items: center; width: 42px; height: 42px; border-radius: 14px; background: var(--surface-soft); color: var(--primary-dark); font-weight: 900; }
.admin-status { display: inline-flex; margin-top: 8px; padding: 5px 9px; border-radius: 999px; background: rgba(47, 158, 68, 0.14); color: var(--free); font-size: 0.8rem; font-weight: 800; }
.admin-book-row.is-hidden .admin-status { background: rgba(92, 113, 132, 0.14); color: var(--muted); }
.admin-row-actions button { border: 1px solid var(--line); border-radius: 999px; background: var(--surface); color: var(--ink); padding: 8px 10px; font: inherit; font-weight: 700; cursor: pointer; }
.admin-row-actions button:disabled { opacity: 0.4; cursor: not-allowed; }
.json-output { min-height: 240px; font-family: Consolas, "Courier New", monospace; font-size: 0.9rem; white-space: pre; }
@media (max-width: 980px) { .hero-grid, .split-layout, .book-detail { grid-template-columns: 1fr; } .book-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); } .grid-3, .grid-2 { grid-template-columns: 1fr; } }
@media (max-width: 980px) { .admin-layout { grid-template-columns: 1fr; } }
@media (max-width: 760px) { .site-header { position: sticky; } .brand-sub { display: none; } .header-row { min-height: auto; padding: 14px 0; flex-wrap: wrap; gap: 12px; } .nav-toggle { display: inline-flex; } .site-nav { width: 100%; display: none; flex-direction: column; align-items: stretch; gap: 6px; padding: 10px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); box-shadow: var(--shadow); } .site-nav.is-open { display: flex; } .site-nav a { width: 100%; border-radius: 14px; } .hero { padding-top: 38px; } .hero-stats { grid-template-columns: 1fr; } .home-filter-panel { align-items: stretch; flex-direction: column; } .home-filter-panel p { flex: auto; } .book-grid, .meta-list, .admin-form-grid { grid-template-columns: 1fr; } .section-head, .footer-bar, .admin-panel-head, .admin-book-row { flex-direction: column; align-items: flex-start; } }