:root {
    --bg: #f0ebe1;
    --bg-card: #faf7f0;
    --bg-card-hover: #fffdf8;
    --ink: #2c2c2c;
    --ink-light: #6a6a6a;
    --vermillion: #c41e3a;
    --vermillion-dark: #9b1830;
    --gold: #8a6d2b;
    --gold-dim: #7a6030;
    --gold-bg: rgba(138,109,43,0.05);
    --border: #c8bda0;
    --border-light: #e2dace;
    --tag-bg: rgba(196,30,58,0.07);
    --tag-border: rgba(196,30,58,0.25);
    --font-title: 'Ma Shan Zheng', cursive;
    --font-body: 'Noto Serif SC', serif;
}

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

body {
    font-family: var(--font-body);
    font-size: 17px;
    background: var(--bg);
    color: var(--ink);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    background:
        radial-gradient(ellipse at 15% 20%, rgba(120,100,70,0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 85% 70%, rgba(100,80,50,0.06) 0%, transparent 45%);
}

body::after {
    content: '';
    position: fixed;
    inset: 0;
    z-index: -1;
    opacity: 0.018;
    background-image:
        repeating-linear-gradient(
            0deg,
            transparent,
            transparent 2px,
            rgba(100,80,50,0.3) 2px,
            transparent 3px
        ),
        repeating-linear-gradient(
            90deg,
            transparent,
            transparent 3px,
            rgba(100,80,50,0.15) 3px,
            transparent 4px
        );
    pointer-events: none;
}

.xf-tabs {
    max-width: 900px;
    margin: 0 auto;
    padding: 48px 24px 0;
    display: flex;
    gap: 0;
    border-bottom: 2px solid var(--border-light);
}

.xf-tab {
    font-family: var(--font-title);
    font-size: 1.3rem;
    padding: 10px 32px 10px;
    background: none;
    border: none;
    border-bottom: 3px solid transparent;
    margin-bottom: -2px;
    color: var(--ink-light);
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 4px;
    position: relative;
}

.xf-tab::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    right: 50%;
    height: 4px;
    background: var(--vermillion);
    border-radius: 2px 2px 0 0;
    transition: left 0.3s cubic-bezier(0.4, 0, 0.2, 1), right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.xf-tab.active::after {
    left: 0;
    right: 0;
}

.xf-tab:hover {
    color: var(--ink);
    transition: color 0.3s ease;
}

.xf-tab.active {
    color: var(--vermillion);
    border-bottom-color: transparent;
}

.xf-main {
    max-width: 900px;
    margin: 0 auto;
    padding: 28px 24px 80px;
}

.xf-section-title {
    font-family: var(--font-title);
    font-size: 1.1rem;
    color: var(--ink-light);
    letter-spacing: 3px;
    margin-bottom: 16px;
    padding-bottom: 6px;
    border-bottom: 1px solid var(--border-light);
    position: relative;
    padding-left: 18px;
}

.xf-section-title::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%) rotate(45deg);
    width: 7px;
    height: 7px;
    background: var(--vermillion);
    opacity: 0.6;
}

.xf-card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    margin-bottom: 32px;
}

.xf-card {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 6px;
    padding: 20px 18px 16px;
    position: relative;
    overflow: hidden;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    animation: xf-card-enter 0.5s cubic-bezier(0.2, 0.8, 0.3, 1) both;
}

@keyframes xf-card-enter {
    from {
        opacity: 0;
        transform: translateY(16px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.xf-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--vermillion), var(--gold-dim), var(--vermillion));
    box-shadow: 0 2px 8px rgba(196,30,58,0.2);
}

.xf-card::after {
    content: '';
    position: absolute;
    inset: 0;
    opacity: 0.025;
    background-image:
        radial-gradient(circle at 20% 30%, rgba(100,80,50,0.4) 0%, transparent 40%),
        radial-gradient(circle at 75% 60%, rgba(80,60,30,0.3) 0%, transparent 35%),
        radial-gradient(circle at 50% 80%, rgba(100,80,50,0.35) 0%, transparent 45%);
    pointer-events: none;
}

.xf-card:hover {
    transform: translateY(-4px);
    background: var(--bg-card-hover);
    box-shadow:
        0 2px 6px rgba(0,0,0,0.03),
        0 8px 20px rgba(0,0,0,0.06),
        0 16px 40px rgba(0,0,0,0.04),
        0 0 0 1px rgba(200,189,160,0.15);
}

.xf-card-name {
    font-family: var(--font-title);
    font-size: 1.5rem;
    color: var(--ink);
    margin-bottom: 8px;
    letter-spacing: 2px;
    text-shadow: 0 1px 2px rgba(0,0,0,0.06);
}

.xf-card-desc {
    font-size: 0.92rem;
    line-height: 1.8;
    color: var(--ink);
}

.xf-card-desc code {
    background: rgba(196,30,58,0.07);
    color: var(--vermillion);
    padding: 1px 5px;
    border-radius: 2px;
    font-family: var(--font-body);
    font-size: 0.9rem;
    border: 1px solid rgba(196,30,58,0.1);
}

.xf-card-desc em {
    color: #1a6b4a;
    background: rgba(26,107,74,0.07);
    padding: 0 3px;
    border-radius: 2px;
    font-style: italic;
}

.xf-card-desc strong {
    color: var(--vermillion);
    font-weight: 700;
}

.xf-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 8px;
}

.xf-card-tag {
    font-size: 0.7rem;
    padding: 2px 8px;
    border: 1px solid var(--tag-border);
    background: var(--tag-bg);
    color: var(--vermillion-dark);
    border-radius: 2px;
    letter-spacing: 1px;
    box-shadow: inset 0 1px 2px rgba(196,30,58,0.06);
    transition: all 0.2s ease;
}

.xf-card-tag:hover {
    background: rgba(196,30,58,0.12);
    border-color: rgba(196,30,58,0.4);
    box-shadow: inset 0 1px 3px rgba(196,30,58,0.1);
}

.xf-card-info {
    display: flex;
    flex-direction: column;
    gap: 3px;
    margin-bottom: 8px;
}

.xf-card-info-row {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.82rem;
}

.xf-card-info-label {
    color: var(--ink-light);
    white-space: nowrap;
}

.xf-card-info-value {
    color: var(--ink);
}

.global-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 900;
    display: flex;
    justify-content: center;
    gap: 0;
    background: rgba(240,235,225,0.88);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-top: 1px solid rgba(200,189,160,0.5);
}

.global-nav::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg,
        transparent 0%,
        var(--gold-dim) 20%,
        var(--vermillion) 50%,
        var(--gold-dim) 80%,
        transparent 100%
    );
    opacity: 0.4;
}

.global-nav-item {
    flex: 1;
    max-width: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    padding: 8px 12px 10px;
    text-decoration: none;
    background: none;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
    font-family: var(--font-body);
    position: relative;
}

.global-nav-item:hover {
    background: rgba(0,0,0,0.03);
}

.global-nav-item.active {
    background: rgba(196,30,58,0.04);
}

.global-nav-item.active::before {
    content: '';
    position: absolute;
    top: 0;
    left: 20%;
    right: 20%;
    height: 2px;
    background: var(--vermillion);
    border-radius: 0 0 2px 2px;
}

.global-nav-icon {
    font-family: var(--font-title);
    font-size: 1.3rem;
    color: var(--ink-light);
    line-height: 1;
    transition: all 0.25s ease;
}

.global-nav-item.active .global-nav-icon {
    color: var(--vermillion);
    font-size: 1.45rem;
}

.global-nav-label {
    font-size: 0.68rem;
    color: var(--ink-light);
    letter-spacing: 1px;
    transition: color 0.2s;
}

.global-nav-item.active .global-nav-label {
    color: var(--vermillion);
    font-weight: 600;
}

@media (max-width: 600px) {
    .xf-tabs {
        padding: 40px 16px 0;
    }
    .xf-tab {
        font-size: 1.1rem;
        padding: 8px 20px 8px;
        letter-spacing: 2px;
    }
    .xf-main {
        padding: 20px 16px 80px;
    }
    .xf-card-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}