/* ============================================================
   Studio0808對外公開站 共用樣式 v2 (2026-06-14)
   - 支援暗 / 亮雙主題(body[data-theme="dark"|"light"])
   - UI 緊實版(間距 -25%)
   - 提高對比 / 可讀性
   ============================================================ */

/* === 暗色主題(預設)=== */
:root,
body[data-theme="dark"] {
    --bg: #0A0F1A;
    --bg-card: #131826;
    --bg-card-hover: #1A2235;
    --bg-elevated: #1E2738;
    --border: rgba(255, 255, 255, 0.10);
    --border-bright: rgba(0, 212, 224, 0.45);
    --border-warm: rgba(245, 158, 11, 0.35);

    --text: #F1F5F9;            /* 更亮 */
    --text-muted: #B8C2D1;      /* 比原來亮 */
    --text-dim: #94A3B8;        /* 比原來亮 */

    --primary: #22D9E7;         /* 比原 #00D4E0 亮一點 */
    --primary-glow: rgba(34, 217, 231, 0.4);
    --accent: #34E68E;          /* 比原 #00E676 亮 */
    --warning: #FBBF24;         /* 比原 #F59E0B 亮 */
    --danger: #F87171;          /* 比原 #EF4444 柔 */
    --purple: #B4A0FF;
    --pink: #F472B6;
    --gold: #FBBF24;

    --beginner: #34E68E;
    --intermediate: #FBBF24;
    --expert: #F87171;

    --nav-bg: rgba(10, 15, 26, 0.88);
    --code-bg: rgba(34, 217, 231, 0.12);
}

/* === 亮色主題 === */
body[data-theme="light"] {
    --bg: #F5F7FA;
    --bg-card: #FFFFFF;
    --bg-card-hover: #F8FAFC;
    --bg-elevated: #FFFFFF;
    --border: rgba(15, 23, 42, 0.12);
    --border-bright: rgba(6, 137, 159, 0.45);
    --border-warm: rgba(180, 83, 9, 0.35);

    --text: #0F172A;
    --text-muted: #374151;
    --text-dim: #6B7280;

    --primary: #06899F;
    --primary-glow: rgba(6, 137, 159, 0.25);
    --accent: #047857;
    --warning: #B45309;
    --danger: #DC2626;
    --purple: #6D28D9;
    --pink: #BE185D;
    --gold: #92400E;

    --beginner: #047857;
    --intermediate: #B45309;
    --expert: #DC2626;

    --nav-bg: rgba(245, 247, 250, 0.88);
    --code-bg: rgba(6, 137, 159, 0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', 'Noto Sans TC', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.65;
    min-height: 100vh;
    transition: background-color 0.2s, color 0.2s;
}
body[data-theme="dark"] {
    background-image:
        radial-gradient(at 20% 0%, rgba(34, 217, 231, 0.05) 0px, transparent 50%),
        radial-gradient(at 80% 100%, rgba(52, 230, 142, 0.04) 0px, transparent 50%);
    background-attachment: fixed;
}
body[data-theme="light"] {
    background-image:
        radial-gradient(at 20% 0%, rgba(6, 137, 159, 0.04) 0px, transparent 50%),
        radial-gradient(at 80% 100%, rgba(4, 120, 87, 0.03) 0px, transparent 50%);
    background-attachment: fixed;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 1rem 1.5rem 2rem;
}

/* === Navigation === */
.top-nav {
    background: var(--nav-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 0.7rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}
.top-nav-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.8rem;
}
.top-nav .brand {
    font-weight: 700;
    color: var(--text);
    text-decoration: none;
    font-size: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.top-nav .brand-icon { font-size: 1.3rem; }

/* 品牌字樣:Studio0808 青藍 + 量化策略實驗室 白 (亮模式黑),搭配輕微 neon 光暈 */
.brand-mark {
    color: var(--primary);
    font-weight: 800;
    letter-spacing: 0.01em;
    text-shadow: 0 0 8px rgba(34, 217, 231, 0.35);
}
.brand-suffix {
    color: var(--text);
    font-weight: 700;
}
body[data-theme="light"] .brand-mark {
    text-shadow: 0 0 6px rgba(6, 137, 159, 0.25);
}
.top-nav .nav-links {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    align-items: center;
}
.top-nav .nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.86rem;
    font-weight: 500;
    transition: color 0.15s;
}
.top-nav .nav-links a:hover,
.top-nav .nav-links a.active { color: var(--primary); }

/* Theme toggle button */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    margin-left: 0.4rem;
    transition: all 0.2s;
}
.theme-toggle:hover {
    color: var(--primary);
    border-color: var(--border-bright);
    transform: rotate(15deg);
}

/* === Hero(超緊實版)=== */
.hero {
    text-align: center;
    padding: 1.2rem 1rem 1rem;
    margin-bottom: 1rem;
}
.hero-icon {
    font-size: 2.5rem;
    margin-bottom: 0.35rem;
    filter: drop-shadow(0 0 14px var(--primary-glow));
}
.hero h1 {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 0.3rem;
    letter-spacing: -0.02em;
    line-height: 1.2;
}
body[data-theme="dark"] .hero h1 {
    background: linear-gradient(135deg, #fff 0%, #B8C2D1 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    color: transparent;
}
.hero .subtitle {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 720px;
    margin: 0 auto;
    line-height: 1.5;
}
.hero .badge-row {
    margin-top: 0.7rem;
    display: flex;
    gap: 0.4rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* === Badges === */
.badge {
    padding: 0.28rem 0.75rem;
    background: rgba(34, 217, 231, 0.12);
    border: 1px solid var(--border-bright);
    color: var(--primary);
    border-radius: 999px;
    font-size: 0.76rem;
    font-weight: 600;
}
body[data-theme="light"] .badge { background: rgba(6, 137, 159, 0.08); }
.badge.accent { background: rgba(52, 230, 142, 0.12); border-color: rgba(52, 230, 142, 0.40); color: var(--accent); }
.badge.warning { background: rgba(251, 191, 36, 0.12); border-color: rgba(251, 191, 36, 0.40); color: var(--warning); }
.badge.danger { background: rgba(248, 113, 113, 0.12); border-color: rgba(248, 113, 113, 0.40); color: var(--danger); }
.badge.purple { background: rgba(180, 160, 255, 0.12); border-color: rgba(180, 160, 255, 0.40); color: var(--purple); }
.badge.beginner { background: rgba(52, 230, 142, 0.14); border-color: rgba(52, 230, 142, 0.4); color: var(--beginner); }
.badge.intermediate { background: rgba(251, 191, 36, 0.14); border-color: rgba(251, 191, 36, 0.4); color: var(--intermediate); }
.badge.expert { background: rgba(248, 113, 113, 0.14); border-color: rgba(248, 113, 113, 0.4); color: var(--expert); }

/* === Sections(超緊實版)=== */
section.block {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.1rem 1.3rem;
    margin-bottom: 0.9rem;
}
section.block h2 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.3rem;
    color: var(--text);
    display: flex;
    align-items: center;
    gap: 0.45rem;
}
section.block h3 {
    font-size: 1.02rem;
    font-weight: 600;
    margin: 0.85rem 0 0.4rem;
    color: var(--primary);
}
section.block .section-desc {
    color: var(--text-muted);
    font-size: 0.88rem;
    margin-bottom: 0.85rem;
    line-height: 1.55;
}
section.block p { margin-bottom: 0.55rem; line-height: 1.6; }
section.block ul, section.block ol { margin: 0 0 0.55rem 1.3rem; }
section.block li { margin-bottom: 0.22rem; line-height: 1.55; }
section.block strong { color: var(--text); font-weight: 600; }
section.block em { color: var(--gold); font-style: normal; font-weight: 600; }
section.block code {
    background: var(--code-bg);
    color: var(--primary);
    padding: 0.12rem 0.4rem;
    border-radius: 4px;
    font-family: 'JetBrains Mono', 'Consolas', monospace;
    font-size: 0.88em;
}

/* === Topic Cards(靠左對齊)=== */
.topic-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 0.8rem;
    margin: 0.9rem 0;
}
.topic-card {
    display: block;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.1rem 1.2rem;
    text-decoration: none;
    color: var(--text);
    transition: all 0.2s;
    position: relative;
    overflow: hidden;
    text-align: left;
}
.topic-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--primary);
    transform: scaleX(0);
    transition: transform 0.25s;
    transform-origin: left;
}
.topic-card:hover {
    border-color: var(--border-bright);
    transform: translateY(-3px);
    box-shadow: 0 10px 28px rgba(34, 217, 231, 0.10);
}
body[data-theme="light"] .topic-card:hover {
    box-shadow: 0 10px 28px rgba(0, 0, 0, 0.08);
}
.topic-card:hover::before { transform: scaleX(1); }
.topic-card .topic-icon { font-size: 1.8rem; margin-bottom: 0.3rem; display: block; }
.topic-card .topic-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 0.25rem; color: var(--text); }
.topic-card .topic-desc { font-size: 0.84rem; color: var(--text-muted); line-height: 1.55; margin-bottom: 0.5rem; }
.topic-card .topic-meta {
    font-size: 0.74rem;
    color: var(--text-dim);
    border-top: 1px dashed var(--border);
    padding-top: 0.45rem;
}

/* === Glossary Entries(緊實 + 靠左)=== */
.entry {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 3px solid;
    border-radius: 8px;
    padding: 0.85rem 1.1rem;
    margin-bottom: 0.65rem;
    transition: border-color 0.2s;
    text-align: left;
}
.entry:hover { background: var(--bg-card-hover); }
.entry.beginner { border-left-color: var(--beginner); }
.entry.intermediate { border-left-color: var(--intermediate); }
.entry.expert { border-left-color: var(--expert); }
.entry-header {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 0.4rem;
}
.entry-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
}
.entry-en {
    color: var(--accent);              /* 改成綠色比較顯眼 */
    font-weight: 600;
    font-style: normal;                /* 不再 italic,提高可讀性 */
    font-size: 0.95rem;
}
.entry-cn {
    color: var(--text-muted);
    font-size: 0.84rem;
}
.entry-summary {
    background: rgba(34, 217, 231, 0.08);
    border-left: 2px solid var(--primary);
    padding: 0.5rem 0.8rem;
    margin: 0.45rem 0;
    border-radius: 4px;
    font-size: 0.92rem;
    color: var(--text);
}
body[data-theme="light"] .entry-summary { background: rgba(6, 137, 159, 0.06); }
.entry-summary strong { color: var(--primary); }
.entry-body {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}
.entry-body p { margin-bottom: 0.5rem; }
.entry-body ul { margin-bottom: 0.5rem; margin-left: 1.3rem; }
.entry-example {
    background: rgba(251, 191, 36, 0.07);
    border: 1px solid var(--border-warm);
    padding: 0.55rem 0.85rem;
    border-radius: 6px;
    font-size: 0.86rem;
    margin-top: 0.5rem;
    color: var(--text);
}
body[data-theme="light"] .entry-example { background: rgba(180, 83, 9, 0.05); }
.entry-example::before {
    content: '💡 實例:';
    font-weight: 700;
    color: var(--warning);
    margin-right: 0.4rem;
}
.entry-link {
    margin-top: 0.5rem;
    font-size: 0.82rem;
    color: var(--text-dim);
}
.entry-link a { color: var(--primary); text-decoration: none; }
.entry-link a:hover { text-decoration: underline; }

/* === Tab / Filter === */
.tab-row {
    display: flex;
    gap: 0.4rem;
    margin-bottom: 1.1rem;
    flex-wrap: wrap;
}
.tab-btn {
    padding: 0.45rem 0.95rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    color: var(--text-muted);
    border-radius: 7px;
    cursor: pointer;
    font-size: 0.86rem;
    font-weight: 600;
    transition: all 0.2s;
}
.tab-btn:hover { color: var(--text); background: var(--bg-card-hover); }
.tab-btn.active {
    background: rgba(34, 217, 231, 0.14);
    border-color: var(--border-bright);
    color: var(--primary);
}
body[data-theme="light"] .tab-btn.active { background: rgba(6, 137, 159, 0.10); }

/* === Master Quote Cards === */
.master-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.3rem 1.6rem;
    margin-bottom: 1.2rem;
}
.master-header {
    display: flex;
    align-items: baseline;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-bottom: 0.3rem;
}
.master-name {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
}
.master-en {
    color: var(--accent);
    font-style: normal;
    font-weight: 600;
    font-size: 1.05rem;
}
.master-meta {
    color: var(--text-muted);              /* 從 dim 改 muted,更亮 */
    font-size: 0.95rem;                    /* 從 0.82 改 0.95,更大 */
    margin-bottom: 0.9rem;
    line-height: 1.55;
    border-bottom: 1px dashed var(--border);
    padding-bottom: 0.65rem;
}
.quote-item {
    background: var(--bg-card-hover);
    border-left: 3px solid var(--gold);
    padding: 0.8rem 1rem;
    margin: 0.65rem 0;
    border-radius: 4px;
}
body[data-theme="light"] .quote-item { background: #FAFBFC; }
.quote-en {
    color: var(--text);
    font-style: italic;
    margin-bottom: 0.35rem;
    line-height: 1.55;
    font-size: 0.95rem;
}
.quote-cn {
    color: var(--text);
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 0.4rem;
}
.quote-note {
    color: var(--text-muted);
    font-size: 0.86rem;
    border-top: 1px dotted var(--border);
    padding-top: 0.45rem;
    line-height: 1.6;
}
.quote-note::before { content: '💡 '; }

/* === Pitfall Article === */
.pitfall {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 4px solid var(--danger);
    border-radius: 12px;
    padding: 1.3rem 1.6rem;
    margin-bottom: 1.3rem;
}
.pitfall .pitfall-num {
    color: var(--danger);
    font-size: 0.8rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.35rem;
}
.pitfall h3 {
    margin-top: 0 !important;
    color: var(--text) !important;
    font-size: 1.25rem !important;
}
.pitfall .pitfall-en {
    color: var(--accent);
    font-style: normal;
    font-weight: 600;
    font-size: 0.92rem;
}
.pitfall-summary {
    background: rgba(248, 113, 113, 0.07);
    border-left: 2px solid var(--danger);
    padding: 0.6rem 0.85rem;
    margin: 0.7rem 0;
    border-radius: 4px;
    color: var(--text);
}
body[data-theme="light"] .pitfall-summary { background: rgba(220, 38, 38, 0.05); }
.pitfall-section { margin-top: 0.95rem; }
.pitfall-section .sec-label {
    display: block;
    font-weight: 700;
    color: var(--warning);
    margin-bottom: 0.4rem;
    font-size: 0.95rem;
}
.pitfall-section.solution .sec-label { color: var(--accent); }

/* === Roadmap Levels === */
.level-ladder {
    display: grid;
    gap: 0.85rem;
}
.level-card {
    display: grid;
    grid-template-columns: 74px 1fr;
    gap: 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-left: 4px solid var(--primary);
    border-radius: 12px;
    padding: 1.1rem 1.4rem;
}
.level-num {
    background: var(--bg-card-hover);
    border-radius: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0.6rem;
    text-align: center;
}
.level-num .num {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--primary);
    font-family: 'JetBrains Mono', monospace;
    line-height: 1;
}
.level-num .label { font-size: 0.68rem; color: var(--text-muted); margin-top: 0.15rem; }
.level-content h3 {
    margin: 0 0 0.3rem !important;
    font-size: 1.1rem !important;
    color: var(--text) !important;
}
.level-content .level-time {
    color: var(--text-dim);
    font-size: 0.82rem;
    margin-bottom: 0.65rem;
}
.level-content .level-bullets {
    list-style: none;
    margin: 0;
    padding: 0;
}
.level-content .level-bullets li {
    padding: 0.22rem 0;
    color: var(--text-muted);
    font-size: 0.88rem;
}
.level-content .level-bullets li::before {
    content: '▸ ';
    color: var(--primary);
    font-weight: 700;
    margin-right: 0.3rem;
}

/* Difficulty tints */
.level-card.lv-1 { border-left-color: var(--beginner); }
.level-card.lv-1 .level-num .num { color: var(--beginner); }
.level-card.lv-2 { border-left-color: #5DD49E; }
.level-card.lv-2 .level-num .num { color: #5DD49E; }
.level-card.lv-3 { border-left-color: var(--gold); }
.level-card.lv-3 .level-num .num { color: var(--gold); }
.level-card.lv-4 { border-left-color: var(--warning); }
.level-card.lv-4 .level-num .num { color: var(--warning); }
.level-card.lv-5 { border-left-color: var(--danger); }
.level-card.lv-5 .level-num .num { color: var(--danger); }
.level-card.lv-6 { border-left-color: var(--purple); }
.level-card.lv-6 .level-num .num { color: var(--purple); }

/* === Footer === */
.site-footer {
    text-align: center;
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.82rem;
    line-height: 1.65;
}
.site-footer .disclaimer {
    color: var(--warning);
    font-weight: 600;
    margin-bottom: 0.4rem;
}
.site-footer .footer-community {
    margin: 0.8rem 0 0.6rem;
    padding: 0.7rem 1rem;
    background: rgba(24, 119, 242, 0.08);
    border: 1px solid rgba(24, 119, 242, 0.35);
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 0.85rem;
}
.site-footer .footer-community a {
    color: #1877F2;
    font-weight: 700;
    text-decoration: none;
    border-bottom: 1px dashed rgba(24, 119, 242, 0.5);
}
.site-footer .footer-community a:hover {
    border-bottom-style: solid;
}
body[data-theme="light"] .site-footer .footer-community {
    background: rgba(24, 119, 242, 0.06);
}

/* === Community CTA (homepage hero promotion) === */
.community-cta {
    background: linear-gradient(135deg, rgba(24, 119, 242, 0.10), rgba(34, 217, 231, 0.06));
    border: 1px solid rgba(24, 119, 242, 0.4);
    border-radius: 14px;
    padding: 1.4rem 1.5rem;
    margin-bottom: 1rem;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 1.2rem;
}
.community-cta .community-icon {
    font-size: 2.6rem;
    line-height: 1;
}
.community-cta .community-text h2 {
    font-size: 1.2rem;
    margin: 0 0 0.3rem;
    color: var(--text);
}
.community-cta .community-text p {
    margin: 0;
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.55;
}
.community-cta .community-text .tag-row {
    margin-top: 0.5rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}
.community-cta .community-text .tag {
    font-size: 0.75rem;
    padding: 0.15rem 0.55rem;
    border-radius: 999px;
    background: rgba(24, 119, 242, 0.15);
    color: #4FA3FF;
    border: 1px solid rgba(24, 119, 242, 0.3);
}
.community-cta .community-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.7rem 1.3rem;
    background: #1877F2;
    color: white;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 700;
    font-size: 0.95rem;
    white-space: nowrap;
    transition: transform 0.2s, box-shadow 0.2s;
}
.community-cta .community-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(24, 119, 242, 0.35);
}
@media (max-width: 640px) {
    .community-cta {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .community-cta .community-text .tag-row { justify-content: center; }
}

/* === Responsive === */
@media (max-width: 768px) {
    .hero h1 { font-size: 1.7rem; }
    .hero .subtitle { font-size: 0.92rem; }
    .level-card { grid-template-columns: 1fr; gap: 0.5rem; }
    .level-num { padding: 0.4rem; }
    .level-num .num { font-size: 1.3rem; }
    section.block { padding: 1.1rem 1rem; }
    .container { padding: 1rem 1rem 2.5rem; }
}

@media (max-width: 480px) {
    .top-nav { padding: 0.55rem 1rem; }
    .top-nav .nav-links { gap: 0.6rem; font-size: 0.8rem; }
    .topic-card { padding: 1rem 0.9rem; }
}

/* === Print === */
@media print {
    .top-nav, .site-footer, .theme-toggle { display: none; }
    body { background: white; color: black; }
    section.block { background: white; border: 1px solid #ccc; }
}