/* ── Reset & Variables ─────────────────────────── */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* ── Dark Theme (Default for crypto) ──────────── */
[data-theme="dark"] {
    --bg-primary: #0d0f1a;
    --bg-card: #161a2b;
    --bg-tag: #1e2340;
    --bg-hover: #1c2038;
    --text-primary: #e8eaf0;
    --text-secondary: #a0a8c0;
    --text-muted: #5a6080;
    --border: #252a45;
    --accent: #00d4aa;
    --accent-hover: #00b894;
    --accent-red: #ff4757;
    --accent-orange: #ffa502;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-hover: 0 4px 16px rgba(0, 212, 170, 0.15);
    --tab-bg: #0d0f1a;
    --signal-bullish: #00d4aa;
    --signal-bearish: #ff4757;
    --signal-neutral: #a0a8c0;
}

/* ── Light Theme ──────────────────────────────── */
[data-theme="light"] {
    --bg-primary: #f8f9fc;
    --bg-card: #ffffff;
    --bg-tag: #f0f2f8;
    --bg-hover: #f4f5fa;
    --text-primary: #1a1a2e;
    --text-secondary: #5a5e80;
    --text-muted: #8890a8;
    --border: #e2e5f0;
    --accent: #00a884;
    --accent-hover: #008f70;
    --accent-red: #e03e4e;
    --accent-orange: #e89500;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 12px rgba(0, 168, 132, 0.12);
    --tab-bg: #f8f9fc;
    --signal-bullish: #00a884;
    --signal-bearish: #e03e4e;
    --signal-neutral: #8890a8;
}

/* ── Base ──────────────────────────────────────── */
html,
body {
    height: 100%;
    font-size: 16px;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-sans);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    transition: background 0.3s, color 0.3s;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* ── Sticky Top (Header + Tabs) ───────────────── */
.sticky-top {
    flex-shrink: 0;
    background: var(--bg-primary);
    z-index: 20;
    border-bottom: 1px solid var(--border);
    transition: background 0.3s;
}

/* ── Header ───────────────────────────────────── */
.header {
    border-bottom: 1px solid var(--border);
}

.header-inner {
    max-width: 720px;
    margin: 0 auto;
    padding: 16px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent);
}

.theme-toggle {
    background: var(--bg-tag);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 6px 12px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.2s;
}

.theme-toggle:hover {
    border-color: var(--accent);
}

[data-theme="light"] .icon-dark {
    display: none;
}

[data-theme="dark"] .icon-light {
    display: none;
}

/* ── Hero ─────────────────────────────────────── */
.hero {
    border-bottom: 1px solid var(--border);
    background: var(--bg-primary);
}

.hero-inner {
    max-width: 720px;
    margin: 0 auto;
    padding: 20px 16px;
    text-align: center;
}

.hero-tagline {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}

.hero-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 6px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 12px;
    font-size: 0.78rem;
    color: var(--text-muted);
}

.stat-divider {
    color: var(--border);
}

@media (max-width: 480px) {
    .hero-inner {
        padding: 16px 12px;
    }

    .hero-tagline {
        font-size: 1.05rem;
    }

    .hero-stats {
        gap: 4px;
        font-size: 0.72rem;
    }
}

/* ── Tabs ─────────────────────────────────────── */
.tabs {
    background: var(--tab-bg);
}

.tabs-inner {
    max-width: 720px;
    margin: 0 auto;
    display: flex;
    padding: 0 16px;
}

.tab {
    flex: 1;
    background: none;
    border: none;
    border-bottom: 2px solid transparent;
    color: var(--text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    padding: 12px 0;
    transition: all 0.2s;
    text-align: center;
}

.tab:hover {
    color: var(--text-secondary);
}

.tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
    font-weight: 600;
}

/* ── Scrollable Content ───────────────────────── */
.content {
    flex: 1;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.container {
    max-width: 720px;
    width: 100%;
    margin: 0 auto;
    padding: 20px 16px 0;
    overflow: hidden;
}

/* ── Tab Panels ───────────────────────────────── */
.tab-panel {
    display: none;
}

.tab-panel.active {
    display: block;
}

/* ── News Card ────────────────────────────────── */
.news-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: var(--shadow);
    overflow: hidden;
    min-width: 0;
}

.news-card:hover {
    box-shadow: var(--shadow-hover);
    border-color: var(--accent);
}

.news-card .card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 8px;
}

.news-card .card-header-left {
    display: flex;
    align-items: center;
    gap: 8px;
    flex: 1;
    min-width: 0;
}

.news-card .card-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
    word-break: break-word;
    overflow-wrap: break-word;
    min-width: 0;
}

.news-card .card-summary {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-top: 8px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.news-card .card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 10px;
    align-items: center;
}

.card-reason,
.modal-reason {
    font-size: 0.82rem;
    color: var(--accent);
    margin-top: 8px;
    line-height: 1.5;
}

.card-sources,
.modal-sources {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 8px;
    word-break: break-all;
    overflow-wrap: break-word;
}

.card-sources a,
.modal-sources a {
    color: var(--accent);
    text-decoration: none;
}

.card-sources a:hover,
.modal-sources a:hover {
    text-decoration: underline;
}

/* ── Tags ─────────────────────────────────────── */
.tag {
    background: var(--bg-tag);
    color: var(--text-secondary);
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 10px;
    white-space: nowrap;
}

.tag.signal-bullish {
    background: rgba(0, 212, 170, 0.15);
    color: var(--signal-bullish);
    font-weight: 600;
}

.tag.signal-bearish {
    background: rgba(255, 71, 87, 0.15);
    color: var(--signal-bearish);
    font-weight: 600;
}

.tag.signal-neutral {
    background: var(--bg-tag);
    color: var(--signal-neutral);
}

.tag.level-critical {
    background: rgba(255, 71, 87, 0.12);
    color: var(--accent-red);
    font-weight: 600;
}

.tag.level-major {
    background: rgba(255, 165, 2, 0.12);
    color: var(--accent-orange);
}

.tag.urgency-immediate {
    background: rgba(255, 71, 87, 0.1);
    color: var(--accent-red);
    font-size: 0.68rem;
}

.tag.coin-tag {
    background: rgba(0, 212, 170, 0.1);
    color: var(--accent);
    font-weight: 500;
}

/* ── Sentiment Bar (多空比例条) ────────────────── */
.sentiment-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    margin-bottom: 16px;
    font-size: 0.85rem;
    box-shadow: var(--shadow);
}

.sb-label {
    color: var(--text-secondary);
    font-weight: 500;
    white-space: nowrap;
}

.sb-bullish {
    color: var(--signal-bullish);
    font-weight: 600;
    white-space: nowrap;
}

.sb-bearish {
    color: var(--signal-bearish);
    font-weight: 600;
    white-space: nowrap;
}

.sb-neutral {
    color: var(--signal-neutral);
    white-space: nowrap;
}

.sb-gauge {
    flex: 1;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
    display: flex;
    min-width: 60px;
}

.sb-bull-part {
    background: var(--signal-bullish);
    transition: width 0.3s;
}

.sb-bear-part {
    background: var(--signal-bearish);
    transition: width 0.3s;
}

@media (max-width: 480px) {
    .sentiment-bar {
        gap: 8px;
        font-size: 0.78rem;
        padding: 10px 12px;
    }
}

/* ── Impact Stars (星级评分) ──────────────────── */
.impact-stars {
    font-size: 0.75rem;
    color: var(--accent-orange);
    white-space: nowrap;
    flex-shrink: 0;
    letter-spacing: 1px;
}

/* ── Category Tag (分类标签) ──────────────────── */
.tag.category-tag {
    background: var(--bg-tag);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    font-size: 0.72rem;
    padding: 2px 8px;
    border-radius: 4px;
}

/* ── Archive Tree ─────────────────────────────── */
.archive-tree {
    padding-bottom: 16px;
}

.tree-node {
    margin-bottom: 2px;
}

.tree-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    background: none;
    border: none;
    padding: 10px 14px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: background 0.15s;
    text-align: left;
    font-family: var(--font-sans);
}

.tree-toggle:hover {
    background: var(--bg-hover);
}

.tree-toggle .arrow {
    display: inline-block;
    font-size: 0.65rem;
    transition: transform 0.2s;
    color: var(--text-muted);
    width: 10px;
    flex-shrink: 0;
}

.tree-node.open>.tree-toggle .arrow {
    transform: rotate(90deg);
}

.tree-toggle .node-label {
    flex: 1;
}

.tree-toggle .node-count {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
}

.tree-children {
    display: none;
    padding-left: 20px;
}

.tree-node.open>.tree-children {
    display: block;
}

/* Day-level news items */
.tree-news-list {
    display: none;
    padding-left: 20px;
}

.tree-node.open>.tree-news-list {
    display: block;
}

.tree-news-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 9px 14px;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.15s;
    font-size: 0.88rem;
    gap: 12px;
}

.tree-news-item:hover {
    background: var(--bg-hover);
}

.tree-news-item .item-title {
    color: var(--text-primary);
    font-weight: 400;
    line-height: 1.4;
}

.tree-news-item .item-signal {
    font-size: 0.72rem;
    flex-shrink: 0;
    white-space: nowrap;
}

/* ── Search ────────────────────────────────────── */
.search-box {
    position: sticky;
    top: 0;
    z-index: 5;
    padding: 12px 0;
    background: var(--bg-primary);
}

.search-box input {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font-sans);
    outline: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.search-box input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(0, 212, 170, 0.15);
}

[data-theme="light"] .search-box input:focus {
    box-shadow: 0 0 0 3px rgba(0, 168, 132, 0.12);
}

.search-meta {
    font-size: 0.82rem;
    color: var(--text-muted);
    padding: 0 0 8px;
}

/* ── Empty State ──────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ── Modal ─────────────────────────────────────── */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.6);
    z-index: 100;
    align-items: center;
    justify-content: center;
    padding: 16px;
}

.modal-overlay.active {
    display: flex;
}

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    max-width: 640px;
    width: 100%;
    max-height: 80vh;
    overflow-y: auto;
    padding: 24px;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
}

.modal-close {
    position: absolute;
    top: 12px;
    right: 16px;
    background: none;
    border: none;
    font-size: 1.2rem;
    color: var(--text-muted);
    cursor: pointer;
    padding: 4px;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-content h2 {
    font-size: 1.2rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.modal-content .meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 16px;
}

.modal-content .meta .signal-label {
    font-weight: 600;
}

.modal-content .meta .signal-label.bullish {
    color: var(--signal-bullish);
}

.modal-content .meta .signal-label.bearish {
    color: var(--signal-bearish);
}

.modal-content .meta .signal-label.neutral {
    color: var(--signal-neutral);
}

.modal-content .body {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

.modal-content .coin-list {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-top: 12px;
}

/* ── Footer ───────────────────────────────────── */
.footer {
    text-align: center;
    padding: 24px 0;
    color: var(--text-muted);
    font-size: 0.8rem;
    border-top: 1px solid var(--border);
    margin-top: 32px;
}

.footer .footer-slogan {
    font-size: 0.88rem;
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 6px;
}

.footer .update-schedule {
    margin-top: 6px;
    font-size: 0.75rem;
    opacity: 0.8;
}

/* ── Responsive ───────────────────────────────── */
@media (max-width: 480px) {

    .header-inner,
    .container {
        padding-left: 12px;
        padding-right: 12px;
    }

    .tabs-inner {
        padding: 0 12px;
    }

    .logo {
        font-size: 1.1rem;
    }

    .news-card {
        padding: 14px;
    }

    .tab {
        font-size: 0.84rem;
    }
}

/* ── Toast 提示 ───────────────────────────────── */
.toast {
    position: fixed;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent);
    color: #0d0f1a;
    padding: 10px 24px;
    border-radius: 8px;
    font-size: 0.88rem;
    font-weight: 600;
    z-index: 200;
    box-shadow: 0 4px 16px rgba(0, 212, 170, 0.3);
    transition: opacity 0.3s;
    pointer-events: none;
}

.toast.hidden {
    display: none;
}