/* #44 冷知识问答卡片 · 社媒分享卡片风（独立设计系统 trv-） */
.trv-page, .trv-modal, .trv-toast {
    --trv-bg: #fff8ef;
    --trv-surface: #ffffff;
    --trv-surface-2: #f6ece0;
    --trv-ink: #2c2340;
    --trv-ink-2: #766b84;
    --trv-line: #e8d9c8;
    --trv-coral: #ec5c72;
    --trv-indigo: #4f42a8;
    --trv-lemon: #f2bd2c;
    --trv-shadow: 0 14px 36px rgba(76, 52, 64, .13);
    --trv-c1: #ec5c72;
    --trv-c2: #ffb35c;
}
:root[data-theme="dark"] .trv-page,
:root[data-theme="dark"] .trv-modal,
:root[data-theme="dark"] .trv-toast {
    --trv-bg: #171320;
    --trv-surface: #211b2c;
    --trv-surface-2: #2b2338;
    --trv-ink: #f6eef7;
    --trv-ink-2: #b4a7c0;
    --trv-line: #3d324c;
    --trv-coral: #ff8fa0;
    --trv-indigo: #a99bff;
    --trv-lemon: #ffd66b;
    --trv-shadow: 0 18px 44px rgba(0, 0, 0, .45);
}
.trv-page [hidden] { display: none !important; }
.trv-page {
    background: var(--trv-bg); color: var(--trv-ink); padding: 26px 0 60px;
    font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", system-ui, sans-serif;
    font-size: 15px; line-height: 1.8;
    background-image: radial-gradient(circle at 4% 12%, rgba(236, 92, 114, .13), transparent 28%),
        radial-gradient(circle at 96% 8%, rgba(79, 66, 168, .11), transparent 26%);
}
.trv-wrap { max-width: 1160px; margin: 0 auto; padding: 0 22px; }
.trv-page b { color: var(--trv-coral); }
.trv-page h1, .trv-page h2, .trv-page h3 { line-height: 1.35; letter-spacing: -.02em; }
.trv-page h2 { font-size: 23px; margin: 0; font-weight: 900; }
.trv-page h3 { font-size: 17px; margin: 0 0 10px; font-weight: 850; }
.trv-page p { margin: 0; }
.trv-page input { font-family: inherit; }

/* 首屏 */
.trv-hero { display: grid; grid-template-columns: 1fr .88fr; gap: 34px; margin-top: 22px; align-items: start; }
.trv-hero-copy { min-width: 0; padding-top: 10px; }
.trv-sticker { display: inline-flex; align-items: center; gap: 10px; font-size: 11px; font-weight: 900; letter-spacing: .1em; color: #fff; background: var(--trv-coral); padding: 8px 15px; border-radius: 4px; transform: rotate(-1.5deg); box-shadow: 4px 4px 0 var(--trv-lemon); }
.trv-sticker span { font-weight: 600; opacity: .9; }
.trv-hero h1 { font-size: clamp(34px, 4.6vw, 54px); margin: 26px 0 16px; font-weight: 900; }
.trv-sub { font-size: 17px; line-height: 2; color: var(--trv-ink-2); max-width: 620px; }
.trv-hero-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; margin: 26px 0 18px; max-width: 620px; }
.trv-hero-stats > div { background: var(--trv-surface); border: 2px solid var(--trv-ink); border-radius: 10px; padding: 11px; box-shadow: 4px 4px 0 var(--trv-lemon); }
:root[data-theme="dark"] .trv-hero-stats > div { border-color: var(--trv-line); }
.trv-hero-stats b { display: block; font-size: 25px; font-variant-numeric: tabular-nums; }
.trv-hero-stats span { font-size: 11px; color: var(--trv-ink-2); }
.trv-hero-note { font-size: 12px; line-height: 1.9; color: var(--trv-ink-2); border-left: 4px solid var(--trv-indigo); padding-left: 12px; max-width: 620px; }
.trv-deck { background: var(--trv-surface); border: 1px solid var(--trv-line); border-radius: 18px; padding: 18px; box-shadow: var(--trv-shadow); min-width: 0; }
.trv-deck-head { display: flex; justify-content: space-between; font-size: 10px; letter-spacing: .12em; font-weight: 850; color: var(--trv-ink-2); margin-bottom: 12px; }
.trv-card { perspective: 1200px; height: 288px; cursor: pointer; }
.trv-card-inner { position: relative; width: 100%; height: 100%; transform-style: preserve-3d; transition: transform .55s cubic-bezier(.4, .2, .2, 1); }
.trv-card.is-flipped .trv-card-inner { transform: rotateY(180deg); }
.trv-face { position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden; border-radius: 14px; padding: 20px; display: flex; flex-direction: column; overflow: hidden; }
.trv-front { color: #fff; background: linear-gradient(145deg, var(--trv-c1), var(--trv-c2)); box-shadow: 0 12px 26px rgba(236, 92, 114, .24); }
.trv-front::after { content: ''; position: absolute; width: 210px; height: 210px; border: 26px solid rgba(255, 255, 255, .12); border-radius: 50%; right: -80px; bottom: -90px; }
.trv-back { transform: rotateY(180deg); color: var(--trv-ink); background: var(--trv-surface-2); border: 2px solid var(--trv-line); }
.trv-face-top { display: flex; justify-content: space-between; align-items: center; position: relative; z-index: 1; }
.trv-cat { font-size: 10px; font-weight: 850; letter-spacing: .1em; background: rgba(255, 255, 255, .22); padding: 4px 10px; border-radius: 20px; }
.trv-back .trv-cat { background: var(--trv-coral); color: #fff; }
.trv-back-mark { font-size: 20px; font-weight: 900; color: var(--trv-coral); }
.trv-fav { border: 0; background: rgba(255, 255, 255, .24); color: #fff; font-size: 18px; width: 30px; height: 30px; border-radius: 50%; cursor: pointer; line-height: 1; }
.trv-fav.is-on { background: var(--trv-lemon); color: var(--trv-ink); }
.trv-q { position: relative; z-index: 1; font-size: 23px; font-weight: 900; line-height: 1.6; margin: auto 0; }
.trv-a { font-size: 15px; line-height: 2; margin: auto 0; }
.trv-face-foot { position: relative; z-index: 1; display: flex; justify-content: space-between; font-size: 10px; opacity: .82; border-top: 1px solid rgba(255, 255, 255, .35); padding-top: 10px; }
.trv-back .trv-face-foot { border-top-color: var(--trv-line); opacity: 1; color: var(--trv-ink-2); }
.trv-scorebar { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin: 16px 0 12px; }
.trv-scorebar > div { background: var(--trv-surface-2); border-radius: 9px; padding: 8px 10px; text-align: center; }
.trv-scorebar span { display: block; font-size: 10px; color: var(--trv-ink-2); }
.trv-scorebar b { font-size: 19px; font-variant-numeric: tabular-nums; }
.trv-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.trv-actions.small { margin-top: 8px; }
.trv-btn-main, .trv-btn-know, .trv-btn-no, .trv-btn-ghost, .trv-btn-sub { font-family: inherit; font-size: 13px; font-weight: 850; padding: 10px 14px; border-radius: 9px; cursor: pointer; border: 2px solid var(--trv-ink); }
:root[data-theme="dark"] .trv-btn-main, :root[data-theme="dark"] .trv-btn-know, :root[data-theme="dark"] .trv-btn-no { border-color: var(--trv-line); }
.trv-btn-main { flex: 1; background: var(--trv-ink); color: var(--trv-surface); }
.trv-btn-know { background: var(--trv-lemon); color: var(--trv-ink); }
.trv-btn-no { background: var(--trv-coral); color: #fff; }
.trv-btn-ghost { background: transparent; color: var(--trv-ink); border-color: var(--trv-line); flex: 1; font-size: 12px; padding: 8px 6px; }
.trv-btn-ghost:hover { border-color: var(--trv-coral); }
.trv-btn-sub { background: var(--trv-coral); color: #fff; border-color: var(--trv-coral); }
.trv-themes { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; margin-top: 12px; }
.trv-themes span { font-size: 11px; font-weight: 750; color: var(--trv-ink-2); }
.trv-themes button { font-family: inherit; font-size: 11px; font-weight: 750; padding: 5px 10px; border-radius: 20px; border: 1px solid var(--trv-line); background: var(--trv-surface-2); color: var(--trv-ink-2); cursor: pointer; }
.trv-themes button.is-on { background: var(--trv-indigo); color: #fff; border-color: var(--trv-indigo); }
.trv-err { font-size: 12px; font-weight: 700; color: var(--trv-coral); margin-top: 10px; }

/* 题库 */
.trv-sec-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 18px; flex-wrap: wrap; }
.trv-sec-head > span { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; border-radius: 8px; flex: none; background: var(--trv-indigo); color: #fff; font-size: 11px; font-weight: 850; }
.trv-sec-head p { font-size: 12px; color: var(--trv-ink-2); }
.trv-page section.trv-library, .trv-page section.trv-share { margin-top: 46px; }
.trv-filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.trv-filters button { font-family: inherit; font-size: 12px; font-weight: 800; padding: 7px 14px; border-radius: 20px; border: 2px solid var(--trv-ink); background: var(--trv-surface); color: var(--trv-ink); cursor: pointer; }
:root[data-theme="dark"] .trv-filters button { border-color: var(--trv-line); color: var(--trv-ink); }
.trv-filters button.is-on { background: var(--trv-coral); color: #fff; border-color: var(--trv-coral); }
.trv-lib-head { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 12px; }
.trv-lib-head h3 small, .trv-batch-out h3 small { font-size: 11px; font-weight: 500; color: var(--trv-ink-2); margin-left: 8px; }
.trv-btns { display: flex; flex-wrap: wrap; gap: 8px; }
.trv-card-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 10px; max-height: 420px; overflow-y: auto; padding: 2px; }
.trv-mini { text-align: left; font-family: inherit; border: 1px solid var(--trv-line); border-left: 4px solid var(--trv-coral); border-radius: 9px; background: var(--trv-surface); padding: 10px 11px; cursor: pointer; min-width: 0; }
.trv-mini:hover { border-color: var(--trv-coral); }
.trv-mini b { display: block; font-size: 12px; line-height: 1.6; }
.trv-mini small { display: block; font-size: 10px; color: var(--trv-ink-2); margin-top: 4px; }
.trv-batch-out { margin-top: 18px; background: var(--trv-surface); border: 1px solid var(--trv-line); border-radius: 14px; padding: 18px; box-shadow: var(--trv-shadow); }
.trv-scroll { width: 100%; overflow-x: auto; }
.trv-table { width: 100%; border-collapse: collapse; font-size: 13px; min-width: 560px; }
.trv-table th, .trv-table td { padding: 9px 11px; border-bottom: 1px solid var(--trv-line); text-align: left; }
.trv-table th { font-size: 11px; color: var(--trv-ink-2); background: var(--trv-surface-2); font-weight: 750; }
.trv-table td { vertical-align: top; }
.trv-note { font-size: 11px; line-height: 1.85; color: var(--trv-ink-2); margin-top: 10px; }

/* 分享 */
.trv-share-grid { display: grid; grid-template-columns: 1fr .8fr; gap: 20px; }
.trv-share-copy { background: var(--trv-surface); border: 1px solid var(--trv-line); border-radius: 14px; padding: 24px; box-shadow: var(--trv-shadow); min-width: 0; }
.trv-share-copy h3 { font-size: 20px; }
.trv-share-copy > p { font-size: 13px; line-height: 2.05; color: var(--trv-ink-2); margin-bottom: 12px; }
.trv-prose-p { font-size: 13px; }
.trv-share-preview { background: var(--trv-surface-2); border: 1px dashed var(--trv-coral); border-radius: 14px; padding: 14px; text-align: center; min-width: 0; }
.trv-preview-kicker { font-size: 10px; letter-spacing: .12em; font-weight: 850; color: var(--trv-coral); margin-bottom: 10px; }
.trv-share-preview canvas { width: 100%; max-width: 300px; height: auto; border-radius: 10px; box-shadow: var(--trv-shadow); display: block; margin: 0 auto; }

/* 弹窗 */
.trv-modal { position: fixed; inset: 0; z-index: 9000; background: rgba(28, 20, 38, .68); display: flex; align-items: center; justify-content: center; padding: 18px; }
.trv-modal[hidden] { display: none !important; }
.trv-modal-box { position: relative; width: min(460px, 100%); max-height: 88vh; overflow-y: auto; background: var(--trv-surface); color: var(--trv-ink); border-radius: 16px; padding: 26px; box-shadow: var(--trv-shadow); }
.trv-modal-x { position: absolute; right: 12px; top: 8px; border: 0; background: transparent; font-size: 24px; color: var(--trv-ink-2); cursor: pointer; line-height: 1; }
.trv-modal-kicker { font-size: 10px; letter-spacing: .14em; font-weight: 850; color: var(--trv-coral); }
.trv-modal-box h3 { font-size: 21px; margin: 8px 0 14px; }
.trv-modal-result { background: var(--trv-surface-2); border-radius: 10px; padding: 14px; font-size: 13px; line-height: 1.9; margin-bottom: 16px; }
.trv-toast { position: fixed; left: 50%; bottom: 30px; transform: translateX(-50%); z-index: 9500; background: var(--trv-ink); color: var(--trv-surface); padding: 11px 20px; border-radius: 9px; font-size: 13px; box-shadow: var(--trv-shadow); }
.trv-toast[hidden] { display: none !important; }

@media (max-width: 900px) {
    .trv-hero, .trv-share-grid { grid-template-columns: 1fr; }
    .trv-card-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
    .trv-wrap { padding: 0 14px; }
    .trv-page { padding-top: 16px; font-size: 14px; }
    .trv-hero h1 { font-size: 31px; }
    .trv-sub { font-size: 15px; }
    .trv-hero-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .trv-card { height: 258px; }
    .trv-q { font-size: 19px; }
    .trv-card-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
    .trv-scorebar { grid-template-columns: repeat(4, minmax(0, 1fr)); }
    .trv-page section.trv-library, .trv-page section.trv-share { margin-top: 30px; }
    .trv-share-copy { padding: 16px; }
    .trv-table { min-width: 480px; }
}