:root {
  --bg: #f4f6fa;
  --surface: #ffffff;
  --border: #dde3ee;
  --text: #16213d;
  --text-muted: #5b6579;
  --accent: #14213d;
  --shadow: 0 1px 3px rgba(20, 33, 61, 0.08), 0 4px 16px rgba(20, 33, 61, 0.06);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1420;
    --surface: #171d2d;
    --border: #2a3346;
    --text: #e7ebf5;
    --text-muted: #9aa4bd;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.3), 0 4px 16px rgba(0, 0, 0, 0.25);
  }
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang TC", "Noto Sans TC", sans-serif;
  display: flex;
  flex-direction: column;
}

/* ---------- topbar ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1rem;
  padding-top: max(0.6rem, env(safe-area-inset-top));
  padding-left: max(1rem, env(safe-area-inset-left));
  padding-right: max(1rem, env(safe-area-inset-right));
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 1rem;
  flex-shrink: 0;
}
.brand-mark { font-size: 1.2rem; }

.search-wrap {
  position: relative;
  flex: 1 1 260px;
  min-width: 180px;
  order: 3;
}

.site-nav {
  order: 2;
  display: flex;
  gap: 0.4rem;
  flex-shrink: 1;
  min-width: 0;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.site-nav::-webkit-scrollbar { display: none; }

@media (min-width: 720px) {
  .search-wrap { order: 2; }
  .site-nav { order: 3; }
}

.search-input {
  width: 100%;
  padding: 0.55rem 0.8rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.95rem;
}
.search-input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}

.nav-chip {
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.85rem;
  white-space: nowrap;
}
.nav-chip.active {
  border-color: var(--accent);
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, transparent);
  font-weight: 600;
}

/* ---------- search results dropdown ---------- */

.search-results {
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  right: 0;
  max-height: min(70vh, 480px);
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 0.3rem;
}

.search-hit {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  text-align: left;
  padding: 0.5rem 0.6rem;
  border: none;
  background: none;
  border-radius: 8px;
  cursor: pointer;
  color: var(--text);
  font: inherit;
}
.search-hit:hover, .search-hit:focus {
  background: var(--bg);
}

.hit-icon { font-size: 1.15rem; flex-shrink: 0; }
.hit-body {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  min-width: 0;
  flex: 1;
}
.hit-title {
  font-weight: 600;
  font-size: 0.92rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.hit-summary {
  font-size: 0.78rem;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.hit-site {
  flex-shrink: 0;
  font-size: 0.72rem;
  padding: 0.15rem 0.5rem;
  border-radius: 999px;
  color: var(--accent);
  border: 1px solid var(--accent);
}

.search-empty {
  padding: 1rem;
  color: var(--text-muted);
  font-size: 0.88rem;
  text-align: center;
}

/* ---------- main / home ---------- */

#app-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.home-view {
  padding: 2rem 1.2rem;
  padding-bottom: max(2rem, env(safe-area-inset-bottom));
  padding-left: max(1.2rem, env(safe-area-inset-left));
  padding-right: max(1.2rem, env(safe-area-inset-right));
  max-width: 900px;
  margin: 0 auto;
  width: 100%;
}

.home-intro {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  text-align: center;
}

.site-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.site-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.6rem;
  padding: 2rem 1rem;
  border-radius: 16px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 4px solid var(--accent);
  text-decoration: none;
  color: var(--text);
  box-shadow: var(--shadow);
  transition: transform 0.15s ease;
}
.site-card:hover { transform: translateY(-2px); }
.site-card-icon { font-size: 2.2rem; }
.site-card-name { font-weight: 700; text-align: center; }

/* ---------- site view (iframe) ---------- */

.site-view {
  flex: 1;
  display: flex;
  min-height: 0;
}

#site-frame {
  flex: 1;
  width: 100%;
  border: none;
  min-height: 0;
}