:root {
  --bg: #f2f3f5;
  --card-bg: #ffffff;
  --text: #222222;
  --muted: #666666;
  --accent: #1976d2;
  --tag: #1976d2;
  --overview-bg: #f0f4f8;
  --overview-text: #1a1a1a;
  --border: #e4e6eb;
  --font-scale: 15px;
  --family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}
body[data-bg="dark"] {
  --bg: #1e1e1e;
  --card-bg: #2a2a2a;
  --text: #e0e0e0;
  --muted: #aaaaaa;
  --accent: #64b5f6;
  --tag: #64b5f6;
  --overview-bg: #2a2a2a;
  --overview-text: #f0f0f0;
  --border: #3a3a3a;
}
body[data-font="small"] { --font-scale: 13px; }
body[data-font="large"] { --font-scale: 18px; }
body[data-family="song"] { --family: Georgia, "Songti SC", "SimSun", serif; }

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--family);
  font-size: var(--font-scale);
  line-height: 1.6;
  -webkit-tap-highlight-color: transparent;
}
.hidden { display: none !important; }
.view { max-width: 720px; margin: 0 auto; min-height: 100vh; }

/* topbar */
.topbar {
  position: sticky; top: 0; z-index: 10;
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px; padding-top: max(10px, env(safe-area-inset-top));
  background: var(--card-bg); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 600; font-size: 1.05em; flex: 1; }
.topbar-actions { display: flex; gap: 4px; }
.icon-btn {
  background: none; border: none; color: var(--text);
  font-size: 1.3em; width: 38px; height: 38px; border-radius: 8px; cursor: pointer;
}
.icon-btn:active { background: var(--bg); }

/* tabs */
.tabs {
  display: flex; background: var(--card-bg);
  border-bottom: 1px solid var(--border); position: sticky; top: 57px; z-index: 9;
}
.tab {
  flex: 1; padding: 12px 4px; border: none; background: none;
  color: var(--muted); font-size: 0.95em; cursor: pointer;
  border-bottom: 2px solid transparent;
}
.tab.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 600; }

/* cards */
.cards { padding: 8px; }
.card {
  background: var(--card-bg); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px; margin-bottom: 10px; cursor: pointer;
}
.card.read { opacity: 0.65; }
.card-title { font-weight: 600; font-size: 1.05em; margin: 0 0 6px; }
.card-meta { color: var(--muted); font-size: 0.82em; margin-bottom: 6px; }
.card-overview { color: var(--text); margin: 6px 0; }
.card-tags { color: var(--tag); font-size: 0.82em; margin-top: 8px; }
.card-foot { color: var(--muted); font-size: 0.8em; margin-top: 6px; }
.badge-ad { color: #e67e22; }
.badge-star { color: #f5a623; }

.empty { text-align: center; color: var(--muted); margin-top: 80px; }

/* login */
#login-view { display: flex; align-items: center; justify-content: center; padding: 24px; }
.login-card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: 16px;
  padding: 28px 24px; width: 100%; max-width: 340px; display: flex; flex-direction: column; gap: 14px;
}
.login-card h1 { margin: 0 0 6px; font-size: 1.3em; text-align: center; }
.login-card input {
  padding: 12px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--bg); color: var(--text); font-size: 1em;
}
.login-card button, button.primary {
  padding: 12px; border: none; border-radius: 10px; background: var(--accent);
  color: #fff; font-size: 1em; cursor: pointer;
}
.error { color: #e74c3c; font-size: 0.85em; text-align: center; margin: 0; }

/* detail */
.detail { padding: 16px; padding-bottom: 60px; }
.detail h1 { font-size: 1.25em; margin: 0 0 10px; }
.detail .meta { color: var(--muted); font-size: 0.85em; margin-bottom: 8px; }
.detail .tags { color: var(--tag); font-size: 0.85em; margin-bottom: 14px; }
.detail .overview {
  background: var(--overview-bg); color: var(--overview-text);
  padding: 12px 14px; border-radius: 10px; margin-bottom: 16px; font-weight: 500;
}
.detail .summary { white-space: pre-wrap; }
.detail .original { white-space: pre-wrap; color: var(--muted); margin-top: 12px;
  border-top: 1px dashed var(--border); padding-top: 12px; }
.actions {
  position: sticky; bottom: 0; display: flex; flex-wrap: wrap; gap: 8px;
  background: var(--card-bg); border-top: 1px solid var(--border);
  padding: 10px; padding-bottom: max(10px, env(safe-area-inset-bottom)); margin: 16px -16px -60px;
}
.action-btn {
  flex: 1 1 auto; min-width: 72px; padding: 10px 8px; border: 1px solid var(--border);
  border-radius: 10px; background: var(--bg); color: var(--text); font-size: 0.9em; cursor: pointer;
}
.action-btn.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.depth-seg { display: flex; flex: 1 1 100%; gap: 6px; }
.depth-seg button { flex: 1; padding: 8px; border: 1px solid var(--border);
  background: var(--bg); color: var(--text); border-radius: 8px; cursor: pointer; }
.depth-seg button.on { background: var(--accent); color: #fff; border-color: var(--accent); }

/* settings modal */
.modal {
  position: fixed; inset: 0; background: rgba(0,0,0,0.45);
  display: flex; align-items: flex-end; justify-content: center; z-index: 50;
}
.modal-card {
  background: var(--card-bg); width: 100%; max-width: 720px;
  border-radius: 16px 16px 0 0; padding: 20px;
  padding-bottom: max(20px, env(safe-area-inset-bottom));
}
.modal-card h2 { margin: 0 0 16px; font-size: 1.1em; }
.setting-row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }
.setting-row label { color: var(--muted); }
.seg { display: flex; gap: 6px; }
.seg button {
  padding: 8px 14px; border: 1px solid var(--border); background: var(--bg);
  color: var(--text); border-radius: 8px; cursor: pointer;
}
.seg button.on { background: var(--accent); color: #fff; border-color: var(--accent); }

/* toast */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: rgba(0,0,0,0.82); color: #fff; padding: 10px 18px; border-radius: 20px;
  font-size: 0.9em; z-index: 100;
}