/* 炫星起源社区 - 深空主题样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg-deep: #0a0a1a;
    --bg-card: #12122a;
    --bg-card-hover: #1a1a3a;
    --border: #2a2a4a;
    --text: #e0e0f0;
    --text-dim: #8888aa;
    --accent: #6366f1;
    --accent-light: #818cf8;
    --gold: #fbbf24;
}

body {
    font-family: 'Noto Sans SC', -apple-system, sans-serif;
    background: var(--bg-deep);
    color: var(--text);
    min-height: 100vh;
    position: relative;
}

#starfield {
    position: fixed;
    top: 0; left: 0;
    width: 100%; height: 100%;
    z-index: 0;
    pointer-events: none;
}

.navbar {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 26, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 60px;
}

.nav-logo {
    font-size: 20px;
    font-weight: 700;
    color: var(--accent-light);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}

.nav-links a:hover { color: var(--text); }

.nav-user {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn {
    padding: 8px 16px;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    font-size: 14px;
    text-decoration: none;
    display: inline-block;
    transition: all 0.2s;
}

.btn-primary {
    background: var(--accent);
    color: white;
}
.btn-primary:hover { background: var(--accent-light); }

.btn-ghost {
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border);
}
.btn-ghost:hover { color: var(--text); border-color: var(--text-dim); }

.btn-admin {
    background: #7c3aed;
    color: white;
    font-size: 12px;
    padding: 6px 12px;
}

.user-chip {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
}

.level-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px; height: 22px;
    border-radius: 50%;
    font-size: 11px;
    font-weight: 700;
    color: #000;
}

.main-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 24px 20px;
    position: relative;
    z-index: 1;
}

/* 卡片 */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 16px;
    transition: border-color 0.2s;
}

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

.card-title {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text);
}

/* 帖子列表 */
.post-item {
    padding: 16px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    transition: background 0.15s;
}

.post-item:last-child { border-bottom: none; }
.post-item:hover { background: var(--bg-card-hover); }

.post-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text);
}

.post-meta {
    font-size: 12px;
    color: var(--text-dim);
    display: flex;
    gap: 16px;
}

/* 表单 */
.form-group { margin-bottom: 16px; }
.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    color: var(--text-dim);
}

.form-control {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-deep);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 14px;
}

.form-control:focus {
    outline: none;
    border-color: var(--accent);
}

textarea.form-control {
    min-height: 150px;
    resize: vertical;
}

/* 成就网格 */
.achievement-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 16px;
}

.achievement-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
}

.achievement-icon {
    font-size: 36px;
    margin-bottom: 8px;
}

.achievement-card.unlocked .achievement-icon {
    filter: drop-shadow(0 0 8px var(--gold));
}

.achievement-card.locked {
    opacity: 0.4;
    filter: grayscale(1);
}

.achievement-name {
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 4px;
}

.achievement-desc {
    font-size: 12px;
    color: var(--text-dim);
}

/* 排行榜 */
.rank-item {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    border-bottom: 1px solid var(--border);
}

.rank-num {
    width: 32px;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-dim);
}

.rank-item:nth-child(1) .rank-num { color: #ffd700; }
.rank-item:nth-child(2) .rank-num { color: #c0c0c0; }
.rank-item:nth-child(3) .rank-num { color: #cd7f32; }

/* 经验条 */
.xp-bar {
    height: 8px;
    background: var(--bg-deep);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 8px;
}

.xp-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-light));
    border-radius: 4px;
    transition: width 0.3s;
}

/* 板块 */
.board-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 16px;
}

.board-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 20px;
    text-decoration: none;
    color: var(--text);
    transition: transform 0.2s, border-color 0.2s;
}

.board-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
}

.board-icon { font-size: 32px; margin-bottom: 8px; }

.footer {
    text-align: center;
    padding: 32px 20px;
    color: var(--text-dim);
    font-size: 14px;
    border-top: 1px solid var(--border);
    margin-top: 40px;
    position: relative;
    z-index: 1;
}

.footer-small { font-size: 12px; margin-top: 8px; opacity: 0.6; }

/* 响应式 */
@media (max-width: 768px) {
    .nav-links { display: none; }
    .achievement-grid { grid-template-columns: repeat(2, 1fr); }
}