/* index.css — 社区首页样式（通用主题见 theme.css）
 *
 * 设计原则：
 *   1. 统一版心 .wrap（max-width 1024px），所有区块对齐同一内容栏
 *   2. 品牌节点树 motif 贯穿 Hero / CTA / About 装饰，形成视觉呼应
 *   3. 柔和的间距节奏（4.5rem 基准间距，2.25rem 组件间距）
 *   4. 动效克制：入场渐显 + 品牌树描边，尊重 prefers-reduced-motion
 */

body {
    align-items: stretch;
    padding: 0;
}

::selection {
    background: var(--accent-glow);
    color: var(--fg);
}

@media (prefers-reduced-motion: no-preference) {
    html { scroll-behavior: smooth; }
}

/* ===== 版心 ===== */
.wrap {
    width: 100%;
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

#main-page { width: 100%; }

/* ===== 按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.55rem 1.3rem;
    font-size: 0.88rem;
    font-weight: 600;
    font-family: inherit;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    line-height: 1.4;
    transition: transform 0.2s ease, background 0.2s, border-color 0.2s, box-shadow 0.25s;
}
.btn:active { transform: scale(0.96); }

.btn-primary {
    position: relative;
    overflow: hidden;
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: #fff;
    box-shadow: 0 2px 8px rgba(232, 133, 58, 0.25);
}
.btn-primary::after {
    content: "";
    position: absolute;
    top: 0; left: -80%;
    width: 50%; height: 100%;
    background: linear-gradient(100deg, transparent, rgba(255,255,255,0.3), transparent);
    transform: skewX(-20deg);
    transition: left 0.5s ease;
    pointer-events: none;
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 16px rgba(232, 133, 58, 0.35);
}
.btn-primary:hover::after { left: 130%; }

.btn-ghost {
    background: var(--accent-soft);
    color: var(--accent-dark);
    border-color: var(--accent-glow);
}
.btn-ghost:hover { border-color: var(--accent); transform: translateY(-1px); }
.btn-lg { padding: 0.72rem 1.8rem; font-size: 0.95rem; border-radius: 999px; letter-spacing: 0.02em; }

/* ===== 头部 ===== */
.header {
    position: sticky;
    top: 0.75rem;
    z-index: 100;
    margin-top: 0.75rem;
}
.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-lg);
    background: rgba(253, 246, 238, 0.75);
    border: 1px solid var(--border-light);
    backdrop-filter: blur(18px) saturate(1.5);
    -webkit-backdrop-filter: blur(18px) saturate(1.5);
    box-shadow: var(--shadow-sm);
    transition: background 0.25s, border-color 0.25s, box-shadow 0.25s;
}
@media (prefers-color-scheme: dark) {
    .header-inner {
        background: rgba(30, 23, 18, 0.78);
        border-color: var(--border);
    }
}

.header h1 {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    cursor: pointer;
    user-select: none;
    transition: color 0.2s;
}
.header h1 svg { color: var(--accent); flex: none; }
.header h1:hover { color: var(--accent); }

.right-group {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.4rem;
}

#avatar {
    width: 34px;
    height: 34px;
    border-radius: 50%;
    border: 1.5px solid var(--border);
    object-fit: cover;
}

#name {
    font-size: 0.85rem;
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ===== Hero ===== */
.hero {
    position: relative;
    text-align: center;
    padding: 5rem 0 6rem;
    overflow: hidden;
}
/* 点阵底纹 */
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(var(--border) 1px, transparent 1px);
    background-size: 28px 28px;
    -webkit-mask-image: radial-gradient(ellipse 65% 55% at 50% 45%, #000 20%, transparent 70%);
    mask-image: radial-gradient(ellipse 65% 55% at 50% 45%, #000 20%, transparent 70%);
    pointer-events: none;
    opacity: 0.7;
}
/* 暖色光晕 */
.hero::after {
    content: "";
    position: absolute;
    left: 50%; top: 44%;
    width: 600px; height: 600px;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, var(--accent-glow), transparent 55%),
                radial-gradient(ellipse 50% 35% at 50% 60%, var(--accent-soft), transparent 65%);
    opacity: 0.45;
    pointer-events: none;
}
.hero-inner { position: relative; z-index: 1; }

/* 品牌树装饰 */
.hero-bg {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    pointer-events: none;
    z-index: 0;
}
.hero-tree {
    width: min(700px, 92%);
    height: auto;
    color: var(--accent);
    opacity: 0.13;
    margin-bottom: -2%;
}
@media (prefers-color-scheme: dark) {
    .hero-tree { opacity: 0.18; }
}

/* 徽章 */
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.32rem 0.9rem;
    margin-bottom: 1.5rem;
    font-size: 0.78rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    color: var(--accent-dark);
    background: var(--accent-soft);
    border: 1px solid var(--accent-glow);
    border-radius: 999px;
}
.badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--accent);
    flex: none;
}

.hero-title {
    font-size: clamp(2rem, 6vw, 3rem);
    font-weight: 800;
    line-height: 1.3;
    letter-spacing: 0.02em;
    text-wrap: balance;
    margin-bottom: 1rem;
}
.accent-text {
    background: linear-gradient(120deg, var(--accent) 15%, var(--accent-dark) 45%, var(--accent) 85%);
    background-size: 220% auto;
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.hero-sub {
    font-size: 1rem;
    letter-spacing: 0.02em;
    color: var(--fg-secondary);
    max-width: 30rem;
    margin: 0 auto;
    line-height: 1.85;
}
.hero-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-top: 2.2rem;
}

.scroll-hint {
    position: absolute;
    left: 50%; bottom: 1.2rem;
    transform: translateX(-50%);
    z-index: 1;
    display: flex;
    color: var(--muted);
    transition: color 0.2s;
}
.scroll-hint:hover { color: var(--accent); }
.scroll-hint svg { width: 20px; height: 20px; }

/* ===== 章节节奏与标题组 ===== */
.section { padding-top: 5rem; }
#features { scroll-margin-top: 5.5rem; }

.section-eyebrow {
    text-align: center;
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.3em;
    text-indent: 0.3em;
    color: var(--accent);
    text-transform: uppercase;
}
.section-title {
    text-align: center;
    margin-top: 0.65rem;
    margin-bottom: 0;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.02em;
}
.section-title::after {
    content: "";
    display: block;
    width: 40px;
    height: 2.5px;
    margin: 0.6rem auto 0;
    border-radius: 2px;
    background: linear-gradient(90deg, var(--accent), var(--accent-dark));
    opacity: 0.85;
}
.section-sub {
    text-align: center;
    margin-top: 0.85rem;
    font-size: 0.92rem;
    letter-spacing: 0.03em;
    color: var(--fg-secondary);
}

/* ===== 特性卡片 ===== */
.features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.15rem;
    margin-top: 2.5rem;
}
.feature-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--card);
    background-image: radial-gradient(240px circle at var(--mx, 50%) var(--my, 0%), var(--accent-soft), transparent 75%);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    padding: 1.6rem 1.4rem 1.3rem;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform 0.25s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}
/* 顶部渐变线（hover 显现） */
.feature-card::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2.5px;
    background: linear-gradient(90deg, var(--accent), var(--accent-dark));
    opacity: 0;
    transition: opacity 0.3s;
}
.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-glow);
    box-shadow: 0 8px 24px rgba(74, 55, 40, 0.08);
}
.feature-card:hover::before { opacity: 0.85; }

.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-bottom: 0.85rem;
    border-radius: 12px;
    background: linear-gradient(135deg, var(--accent-soft), rgba(232, 133, 58, 0.12));
    color: var(--accent-dark);
    transition: transform 0.3s, background 0.3s, color 0.3s, box-shadow 0.3s;
}
.feature-icon svg { width: 20px; height: 20px; }
.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, var(--accent), var(--accent-dark));
    color: #fff;
    transform: translateY(-2px) scale(1.05);
    box-shadow: 0 5px 12px rgba(232, 133, 58, 0.3);
}

.feature-body { flex: 1; }
.feature-body h3 { margin-bottom: 0.35rem; font-size: 1rem; letter-spacing: 0.01em; }
.feature-body p {
    font-size: 0.86rem;
    line-height: 1.75;
    color: var(--fg-secondary);
}

.feature-tag {
    align-self: flex-start;
    margin-top: 0.9rem;
    padding: 0.2rem 0.65rem;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--accent-dark);
    background: var(--accent-soft);
    border: 1px solid var(--accent-glow);
    border-radius: 999px;
    transition: color 0.25s, border-color 0.25s;
}
.feature-card:hover .feature-tag {
    color: var(--accent);
    border-color: var(--accent);
}

/* ===== 关于本站 ===== */
.about-section { position: relative; }

.about-panel {
    position: relative;
    text-align: center;
    background: var(--card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 2.2rem 2.2rem 1.8rem;
    margin-top: 2.5rem;
    overflow: hidden;
    transition: border-color 0.3s, box-shadow 0.3s;
}
.about-panel:hover {
    border-color: var(--border);
    box-shadow: var(--shadow-md);
}
/* 顶部品牌线 */
.about-panel::before {
    content: "";
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 2.5px;
    background: linear-gradient(90deg, var(--accent), var(--accent-dark));
    opacity: 0.8;
}
/* 装饰同心圆 */
.about-deco {
    position: absolute;
    right: -40px; bottom: -40px;
    width: 180px; height: 180px;
    color: var(--accent);
    pointer-events: none;
    opacity: 0.6;
}

.site-intro {
    position: relative;
    max-width: 38rem;
    margin: 0 auto;
    font-size: 0.94rem;
    line-height: 2;
    color: var(--fg-secondary);
}

.about-stats {
    list-style: none;
    display: flex;
    justify-content: space-around;
    gap: 1rem;
    margin-top: 1.6rem;
    padding-top: 1.4rem;
    border-top: 1px solid var(--border-light);
}
.about-stats li {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
    min-width: 0;
}
.about-stats b {
    font-size: 1.4rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: 0.02em;
    background: linear-gradient(120deg, var(--accent), var(--accent-dark));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.about-stats span {
    font-size: 0.76rem;
    letter-spacing: 0.02em;
    color: var(--muted);
}

.quick-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-top: 1.8rem;
}
.quick-links a {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.48rem 1.1rem;
    font-size: 0.84rem;
    font-weight: 600;
    color: var(--fg-secondary);
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 999px;
    text-decoration: none;
    box-shadow: var(--shadow-sm);
    transition: color 0.2s, border-color 0.2s, transform 0.2s, box-shadow 0.2s;
}
.quick-links a::after {
    content: "→";
    font-size: 0.85em;
    transition: transform 0.2s;
}
.quick-links a:hover {
    color: var(--accent);
    border-color: var(--accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}
.quick-links a:hover::after { transform: translateX(3px); }

/* ===== CTA 横幅 ===== */
.cta-band {
    position: relative;
    overflow: hidden;
    text-align: center;
    padding: 3.2rem 1.5rem 3.4rem;
    border-radius: var(--radius-lg);
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: #fff;
    box-shadow: 0 12px 30px rgba(232, 133, 58, 0.22);
}
/* 底部点阵 */
.cta-band::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(255,255,255,0.18) 1px, transparent 1px);
    background-size: 24px 24px;
    -webkit-mask-image: radial-gradient(ellipse 70% 75% at 50% 110%, #000 15%, transparent 68%);
    mask-image: radial-gradient(ellipse 70% 75% at 50% 110%, #000 15%, transparent 68%);
    pointer-events: none;
}
/* 顶部高光线 */
.cta-band::after {
    content: "";
    position: absolute;
    left: 0; right: 0; top: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.45), transparent);
}

.cta-tree {
    position: absolute;
    right: -10px; bottom: -16px;
    width: min(300px, 50%);
    height: auto;
    color: #fff;
    opacity: 0.12;
    pointer-events: none;
}

.cta-title {
    position: relative;
    font-size: clamp(1.4rem, 3.5vw, 1.85rem);
    font-weight: 800;
    letter-spacing: 0.03em;
    margin-bottom: 0;
}
.cta-sub {
    position: relative;
    margin-top: 0.6rem;
    font-size: 0.92rem;
    letter-spacing: 0.04em;
    opacity: 0.9;
}
.btn-cta {
    position: relative;
    margin-top: 1.5rem;
    background: #fff;
    color: var(--accent-dark);
    box-shadow: 0 5px 14px rgba(0,0,0,0.12);
}
.btn-cta:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.16);
}
@media (prefers-color-scheme: dark) {
    .cta-band {
        color: #38220f;
        box-shadow: 0 12px 30px rgba(0,0,0,0.4);
    }
    .cta-band::before {
        background-image: radial-gradient(rgba(56,34,15,0.14) 1px, transparent 1px);
    }
    .cta-band::after {
        background: linear-gradient(90deg, transparent, rgba(56,34,15,0.3), transparent);
    }
    .cta-tree { color: #38220f; opacity: 0.14; }
    .btn-cta { background: #38220f; color: #f7ead9; }
}

/* ===== 页脚 ===== */
.footer {
    width: 100%;
    margin-top: auto;
    padding-top: 5rem;
    padding-bottom: 1.5rem;
}
.footer-inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    padding-top: 1.6rem;
    border-top: 1px solid var(--border-light);
    text-align: center;
    font-size: 0.75rem;
    color: var(--muted);
}
.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    font-size: 0.92rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    color: var(--fg);
}
.footer-brand svg { color: var(--accent); }
.footer-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.35rem 1.5rem;
}
.footer-nav a {
    font-size: 0.82rem;
    color: var(--fg-secondary);
    text-decoration: none;
    transition: color 0.15s;
}
.footer-nav a:hover { color: var(--accent); }
.footer-icp { margin-top: 0.1rem; }
.footer-icp a {
    color: var(--muted);
    text-decoration: none;
    transition: color 0.15s;
}
.footer-icp a:hover { color: var(--accent); }

/* ===== 动画 ===== */
@keyframes fade-up {
    from { opacity: 0; transform: translateY(12px); }
    to   { opacity: 1; transform: none; }
}
@keyframes tree-draw { to { stroke-dashoffset: 0; } }
@keyframes node-pop {
    from { opacity: 0; transform: scale(0); }
    to   { opacity: 1; transform: scale(1); }
}
@keyframes tree-sway {
    0%, 100% { transform: rotate(0deg); }
    50%      { transform: rotate(0.5deg); }
}
@keyframes text-shine { to { background-position: 220% center; } }
@keyframes badge-pulse {
    0%, 100% { box-shadow: 0 0 0 0 var(--accent-glow); }
    50%      { box-shadow: 0 0 0 4px transparent; }
}
@keyframes hint-bounce {
    0%, 100% { transform: translateY(0); }
    50%      { transform: translateY(4px); }
}

@media (prefers-reduced-motion: no-preference) {
    /* Hero 入场 */
    .hero-inner > * {
        animation: fade-up 0.5s ease both;
    }
    .hero-badge   { animation-delay: 0s; }
    .hero-title   { animation-delay: 0.06s; }
    .hero-sub     { animation-delay: 0.12s; }
    .hero-actions { animation-delay: 0.2s; }

    .accent-text { animation: text-shine 8s linear infinite; }
    .badge-dot   { animation: badge-pulse 2.8s ease-in-out infinite; }
    .scroll-hint svg { animation: hint-bounce 2.2s ease-in-out infinite; }

    /* 品牌树描绘 */
    .hero-tree {
        animation: tree-sway 12s ease-in-out 3s infinite;
        transform-origin: 50% 100%;
    }
    .tree-branches path {
        stroke-dasharray: 100;
        stroke-dashoffset: 100;
        animation: tree-draw 0.8s ease-out forwards;
    }
    .tree-branches path:nth-of-type(1) { animation-delay: 0.1s; }
    .tree-branches path:nth-of-type(2),
    .tree-branches path:nth-of-type(3) { animation-delay: 0.6s; }
    .tree-branches path:nth-of-type(n+4) { animation-delay: 1.1s; }

    .tree-nodes circle {
        opacity: 0;
        transform-box: fill-box;
        transform-origin: center;
        animation: node-pop 0.4s ease-out forwards;
    }
    .tree-nodes circle:nth-of-type(1) { animation-delay: 0.15s; }
    .tree-nodes circle:nth-of-type(2) { animation-delay: 0.7s; }
    .tree-nodes circle:nth-of-type(3),
    .tree-nodes circle:nth-of-type(4) { animation-delay: 1.2s; }
    .tree-nodes circle:nth-of-type(n+5) { animation-delay: 1.7s; }
}

/* ===== 滚动渐显 ===== */
.reveal {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.55s ease, transform 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}
.reveal.reveal-in { opacity: 1; transform: none; }

/* ===== 响应式 ===== */
@media (hover: none) and (pointer: coarse) {
    .btn { min-height: 44px; }
    .quick-links a { padding: 0.55rem 1rem; }
}

@media (max-width: 768px) {
    .hero { padding: 4rem 0 4.5rem; }
    .hero::after { width: 400px; height: 400px; opacity: 0.35; }
    .hero-tree { opacity: 0.1; }
    .section { padding-top: 4rem; }
    .footer { padding-top: 4rem; }
}

@media (max-width: 640px) {
    .features { grid-template-columns: 1fr; }
    .feature-card:hover { transform: none; }
}

@media (max-width: 480px) {
    .wrap { padding: 0 0.85rem; }

    .header { top: 0.5rem; margin-top: 0.5rem; }
    .header-inner { padding: 0.4rem 0.8rem; gap: 0.35rem; }
    .header h1 { font-size: 0.98rem; }
    .header h1 svg { display: none; }
    .right-group { gap: 0.3rem; }
    .right-group .btn { padding: 0.48rem 0.9rem; font-size: 0.82rem; }
    #name { max-width: 72px; }

    .hero { padding: 2.8rem 0 2.8rem; }
    .hero::after { width: 280px; height: 280px; opacity: 0.3; }
    .hero-tree { opacity: 0.08; }
    .hero-badge { font-size: 0.72rem; padding: 0.28rem 0.75rem; margin-bottom: 1.1rem; }
    .hero-title { margin-bottom: 0.7rem; }
    .hero-sub { font-size: 0.92rem; }
    .hero-sub br { display: none; }
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
        gap: 0.6rem;
    }
    .hero-actions .btn-lg { width: 100%; padding: 0.82rem 1.4rem; }
    .scroll-hint { display: none; }

    .section { padding-top: 3rem; }
    .section-title { font-size: 1.25rem; }
    .features { margin-top: 1.8rem; gap: 0.9rem; }
    .feature-card { padding: 1.3rem 1.2rem 1.1rem; }

    .about-panel { padding: 1.5rem 1.2rem 1.3rem; margin-top: 1.8rem; }
    .about-stats { margin-top: 1.3rem; padding-top: 1.1rem; gap: 0.5rem; }
    .quick-links { gap: 0.55rem 0.7rem; margin-top: 1.4rem; }

    .cta-band { padding: 2.5rem 1.1rem 2.6rem; }
    .cta-tree { width: 70%; opacity: 0.08; }

    .footer { padding-top: 3rem; }
}

@media (max-width: 360px) {
    .header h1 { font-size: 0.92rem; }
    .right-group .btn { padding: 0.42rem 0.75rem; font-size: 0.78rem; }
    .hero { padding: 2.2rem 0 2.2rem; }
}