:root { color-scheme: light dark; --bg: #f6f7f9; --card: #ffffff; --fg: #111827; --muted: #6b7280; --line: #e5e7eb; --accent: #2563eb; }
@media (prefers-color-scheme: dark) { :root { --bg: #0b0f17; --card: #121826; --fg: #e5e7eb; --muted: #9ca3af; --line: #1f2937; --accent: #60a5fa; } }
* { box-sizing: border-box; }
html, body { margin: 0; background: var(--bg); color: var(--fg); font-family: -apple-system, "PingFang TC", "Noto Sans TC", "Noto Sans CJK TC", system-ui, sans-serif; font-size: 17px; line-height: 1.75; -webkit-text-size-adjust: 100%; }
#top { position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px; padding: calc(10px + env(safe-area-inset-top)) 16px 10px; background: color-mix(in srgb, var(--bg) 88%, transparent); backdrop-filter: blur(10px); border-bottom: 1px solid var(--line); }
#top h1 { font-size: 18px; margin: 0; flex: 1; }
#count { color: var(--muted); font-size: 13px; }
#add { font-size: 22px; line-height: 1; width: 36px; height: 36px; border-radius: 50%; border: 1px solid var(--line); background: var(--card); color: var(--fg); }
#toggle { font-size: 13px; padding: 6px 10px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); color: var(--fg); }
.banner { margin: 10px 16px 0; padding: 8px 12px; border-radius: 10px; background: #fef3c7; color: #78350f; font-size: 14px; cursor: pointer; }
#feed { max-width: 640px; margin: 0 auto; padding: 8px 0 80px; }
.card { background: var(--card); border-bottom: 1px solid var(--line); padding: 14px 16px 10px; }
@media (min-width: 680px) { .card { border: 1px solid var(--line); border-radius: 14px; margin: 12px 0; } }
.card header { display: flex; gap: 8px; align-items: center; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.chip { color: #fff; background: var(--c, #555); padding: 1px 8px; border-radius: 999px; font-size: 12px; }
.card h2 { font-size: 19px; margin: 0 0 8px; line-height: 1.4; }
.body p, .more p { margin: 0 0 10px; }
.body table, .more table { border-collapse: collapse; font-size: 14px; margin: 8px 0; width: 100%; }
.body th, .body td, .more th, .more td { border: 1px solid var(--line); padding: 4px 8px; text-align: left; }
.body code, .more code { font-size: 14px; background: color-mix(in srgb, var(--fg) 8%, transparent); padding: 1px 4px; border-radius: 4px; }
.mermaid { background: transparent; overflow-x: auto; font-size: 14px; }
.mermaid svg { max-width: 100%; height: auto; }
figure { margin: 8px 0; }
figure img { width: 100%; border-radius: 8px; background: #fff; }
figcaption { font-size: 13px; color: var(--muted); }
.more-btn { border: none; background: none; color: var(--accent); padding: 4px 0; font-size: 15px; }
.more { border-left: 3px solid var(--line); padding-left: 12px; margin: 6px 0 10px; font-size: 16px; }
.sources { font-size: 13px; color: var(--muted); margin: 4px 0 8px; }
.sources a { color: var(--accent); text-decoration: none; }
.card footer { border-top: 1px dashed var(--line); padding-top: 8px; }
.reacts { display: flex; gap: 6px; flex-wrap: wrap; }
.reacts button { flex: 1; min-width: 56px; padding: 8px 0; border-radius: 10px; border: 1px solid var(--line); background: transparent; color: var(--fg); font-size: 14px; }
.reacts button.on { background: var(--accent); color: #fff; border-color: var(--accent); }
.comment { display: flex; gap: 6px; margin-top: 8px; }
textarea { flex: 1; width: 100%; font: inherit; font-size: 15px; padding: 8px; border-radius: 10px; border: 1px solid var(--line); background: var(--bg); color: var(--fg); resize: vertical; }
.ack { font-size: 13px; color: var(--muted); margin-top: 6px; }
.hidden { display: none !important; }
#end { text-align: center; color: var(--muted); padding: 24px 16px 80px; font-size: 14px; }
#sheet { position: fixed; left: 0; right: 0; bottom: 0; z-index: 10; max-width: 640px; margin: 0 auto; background: var(--card); border-top: 1px solid var(--line); border-radius: 16px 16px 0 0; padding: 16px 16px calc(16px + env(safe-area-inset-bottom)); box-shadow: 0 -8px 30px rgba(0,0,0,.25); }
#sheet h3 { margin: 0 0 8px; font-size: 16px; }
.row { display: flex; gap: 8px; margin-top: 8px; }
.row button { flex: 1; padding: 10px; border-radius: 10px; border: 1px solid var(--line); background: transparent; color: var(--fg); font-size: 15px; }
button.primary, .send { background: var(--accent); color: #fff; border-color: var(--accent); border-radius: 10px; border: none; padding: 8px 12px; font-size: 14px; }
.katex { font-size: 1.05em; }