/* index.css — 社区首页专属样式（通用主题见 theme.css） */

body {
    align-items: normal;
}

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

/* ===== 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: opacity 0.15s, transform 0.1s, background 0.15s, border-color 0.15s;
}
.btn:active { transform: scale(0.96); }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 2px 8px rgba(232, 133, 58, 0.28); }
.btn-primary:hover { background: var(--accent-dark); opacity: 1; box-shadow: 0 4px 14px rgba(232, 133, 58, 0.36); }
.btn-ghost { background: var(--accent-soft); color: var(--accent-dark); }
.btn-ghost:hover { border-color: var(--accent); opacity: 1; }
.btn-lg { padding: 0.7rem 1.9rem; font-size: 1rem; border-radius: var(--radius-md); }

/* ===== 头部：悬浮毛玻璃导航（镜像 minimap/userpanel 风格） ===== */
.header {
    position: sticky;
    top: 0.75rem;
    z-index: 100;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    background: rgba(253, 246, 238, 0.72);
    border: 1px solid var(--border-light);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    box-shadow: var(--shadow-md);
    transition: background 0.2s, border-color 0.2s;
}
@media (prefers-color-scheme: dark) {
    .header {
        background: rgba(30, 23, 18, 0.72);
        border-color: var(--border);
    }
}

.header h1 {
    display: flex;
    align-items: center;
    font-size: 1.15rem;
    font-weight: 700;
    letter-spacing: 0.01em;
    cursor: pointer;
    user-select: none;
    transition: color 0.15s;
}
.header h1:hover { color: var(--accent); }

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

#avatar {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1.5px solid var(--border);
    object-fit: cover;
}

#name {
    font-size: 0.88rem;
    max-width: 120px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

/* ===== Hero 首屏 ===== */
.hero {
    position: relative;
    text-align: center;
    padding: 6rem 1rem 5rem;
}
.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse 60% 50% at 50% 30%, var(--accent-glow), transparent 70%);
    pointer-events: none;
}
.hero::after {
    content: "";
    position: absolute;
    left: 50%;
    top: 52%;
    width: 640px;
    height: 640px;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, var(--accent-glow), transparent 62%);
    opacity: 0.5;
    pointer-events: none;
}
.hero > * { position: relative; z-index: 1; }
.hero-title {
    font-size: clamp(2rem, 6vw, 3rem);
    font-weight: 800;
    line-height: 1.28;
    letter-spacing: 0.02em;
    margin-bottom: 1rem;
}
.accent-text {
    background: linear-gradient(120deg, var(--accent) 20%, var(--accent-dark) 80%);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}
.hero-sub {
    font-size: 1.08rem;
    color: var(--fg-secondary);
    max-width: 30rem;
    margin: 0 auto;
    line-height: 1.7;
}
.hero-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.85rem;
    margin-top: 2.1rem;
}

/* ===== 特性卡片 ===== */
.section-title {
    text-align: center;
    margin-top: 4rem;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.01em;
}
.section-title::after {
    content: "";
    display: block;
    width: 44px;
    height: 3px;
    margin: 0.6rem auto 0;
    border-radius: 2px;
    background: var(--accent);
    opacity: 0.85;
}
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.1rem;
    width: 100%;
    max-width: 960px;
    margin: 1.75rem auto 0;
}
.feature-card {
    position: relative;
    background: var(--card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    padding: 1.7rem 1.4rem;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    transition: transform 0.18s, box-shadow 0.2s, border-color 0.2s;
}
.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), var(--accent-dark));
    opacity: 0;
    transition: opacity 0.2s;
}
.feature-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
}
.feature-card:hover::before { opacity: 0.9; }
.feature-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    margin-bottom: 0.9rem;
    border-radius: var(--radius-sm);
    background: linear-gradient(135deg, var(--accent-soft), rgba(232, 133, 58, 0.16));
    color: var(--accent-dark);
}
.feature-icon svg { width: 22px; height: 22px; }
.feature-card h3 { margin-bottom: 0.4rem; font-size: 1.05rem; }
.feature-card p {
    font-size: 0.88rem;
    line-height: 1.7;
    color: var(--fg-secondary);
}

/* ===== 关于本站 ===== */
.about {
    text-align: center;
    padding: 1rem 1rem 3rem;
    max-width: 760px;
    margin: 0 auto;
}
.about .site-intro {
    background: var(--card);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    padding: 1.75rem 1.9rem;
}
.site-intro {
    font-size: 0.96rem;
    line-height: 1.95;
    color: var(--fg-secondary);
}
.quick-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 1.5rem;
    margin-top: 1.75rem;
}
.quick-links a {
    font-size: 0.86rem;
    color: var(--muted);
    text-decoration: none;
    padding-bottom: 1px;
    border-bottom: 1px solid transparent;
    transition: color 0.15s, border-color 0.15s;
}
.quick-links a:hover { color: var(--accent); border-bottom-color: var(--accent); }

/* ===== 入场动画 ===== */
@keyframes fade-up {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: none; }
}
@media (prefers-reduced-motion: no-preference) {
    .hero > *, .feature-card, .about { animation: fade-up 0.5s ease both; }
    .hero-sub { animation-delay: 0.08s; }
    .hero-actions { animation-delay: 0.16s; }
    .feature-card:nth-child(2) { animation-delay: 0.06s; }
    .feature-card:nth-child(3) { animation-delay: 0.12s; }
    .feature-card:nth-child(4) { animation-delay: 0.18s; }
}

/* ===== 响应式 ===== */
/* 触屏设备：加大可点目标 */
@media (hover: none) and (pointer: coarse) {
    .btn { min-height: 44px; }
    .quick-links a { padding: 0.5rem 0.25rem; }
}

/* 平板及以下：收敛首屏光晕与留白 */
@media (max-width: 768px) {
    body { padding: 1.25rem 0.75rem; }
    .hero { padding: 4rem 1.25rem 3.5rem; }
    .hero::after { width: 420px; height: 420px; opacity: 0.4; }
    .hero-title { letter-spacing: 0.01em; }
    .features { gap: 0.9rem; }
    .feature-card { padding: 1.4rem 1.2rem; }
}

/* 手机：全宽布局、紧凑排版 */
@media (max-width: 480px) {
    body { padding: 1rem 0.75rem; }
    .header {
        top: 0.5rem;
        padding: 0.45rem 0.85rem;
        gap: 0.4rem;
    }
    .header h1 { font-size: 1rem; }
    .header h1 svg { display: none; } /* 小屏隐藏 logo 图标，避免挤压 */
    .right-group { gap: 0.35rem; }
    .right-group .btn { padding: 0.5rem 0.95rem; font-size: 0.82rem; }
    #name { max-width: 72px; }

    .hero { padding: 3rem 0.75rem 2.5rem; }
    .hero::after { width: 300px; height: 300px; opacity: 0.32; }
    .hero-title { margin-bottom: 0.75rem; }
    .hero-sub { font-size: 0.95rem; }
    .hero-actions {
        flex-direction: column;
        align-items: stretch;
        gap: 0.65rem;
    }
    .hero-actions .btn-lg { width: 100%; padding: 0.85rem 1.5rem; }

    .section-title { margin-top: 2.5rem; font-size: 1.3rem; }
    .features { margin-top: 1.25rem; grid-template-columns: 1fr; }
    .feature-card:hover { transform: none; } /* 触屏取消悬浮位移 */

    .about { padding: 0.5rem 0.5rem 2.5rem; }
    .about .site-intro { padding: 1.4rem 1.3rem; text-align: left; }
    .quick-links { gap: 1rem 1.5rem; margin-top: 1.5rem; }
}

/* 超小屏 */
@media (max-width: 360px) {
    .hero { padding: 2.5rem 0.5rem 2rem; }
    .header h1 { font-size: 0.95rem; }
    .right-group .btn { padding: 0.45rem 0.8rem; font-size: 0.8rem; }
}