:root {
    --bg: #0a0a0a;
    --bg-elevated: #141414;
    --bg-card: #1a1a1a;
    --bg-hover: #222222;
    --border: #2a2a2a;
    --border-focus: #16a34a;
    --accent: #16a34a;
    --accent-hover: #15803d;
    --accent-light: #22c55e;
    --text: #f5f5f5;
    --text-secondary: #a3a3a3;
    --text-muted: #737373;
    --danger: #dc2626;
    --danger-hover: #b91c1c;
    --warning: #d97706;
    --radius: 8px;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
    --transition: all 0.2s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--accent-light);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--accent);
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.container-narrow {
    max-width: 800px;
}

/* Navbar */
.navbar {
    background-color: rgba(10, 10, 10, 0.95);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-size: 1.25rem;
    font-weight: 700;
}

.logo:hover {
    color: var(--accent-light);
}

.logo svg {
    color: var(--accent);
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 28px;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
}

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

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

.user-info {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text);
}

.user-info:hover {
    color: var(--accent-light);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--accent);
    color: #fff;
}

.btn-primary:hover {
    background-color: var(--accent-hover);
    color: #fff;
}

.btn-outline {
    background-color: transparent;
    border-color: var(--border);
    color: var(--text);
}

.btn-outline:hover {
    border-color: var(--accent);
    color: var(--accent-light);
    background-color: rgba(22, 163, 74, 0.08);
}

.btn-danger {
    background-color: var(--danger);
    color: #fff;
}

.btn-danger:hover {
    background-color: var(--danger-hover);
    color: #fff;
}

.btn-warning {
    background-color: var(--warning);
    color: #fff;
}

.btn-warning:hover {
    opacity: 0.9;
}

.btn-success {
    background-color: var(--accent);
    color: #fff;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

.btn-block {
    width: 100%;
}

/* Forms */
.input,
.textarea,
select {
    width: 100%;
    padding: 12px 14px;
    background-color: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    color: var(--text);
    font-size: 0.95rem;
    transition: var(--transition);
    font-family: inherit;
}

.input:focus,
.textarea:focus,
select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.15);
}

.input::placeholder,
.textarea::placeholder {
    color: var(--text-muted);
}

.textarea {
    resize: vertical;
    min-height: 120px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--text);
}

.form-hint {
    margin-top: 6px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.form-check {
    display: flex;
    align-items: center;
}

.check-label {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    color: var(--text-secondary);
}

.check-label input {
    accent-color: var(--accent);
}

.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 24px;
}

.form-divider {
    height: 1px;
    background-color: var(--border);
    margin: 28px 0;
}

.form-section-title {
    font-size: 1.1rem;
    margin-bottom: 16px;
    color: var(--text);
}

.inline-form {
    display: inline-block;
}

/* Main */
.main {
    flex: 1;
    padding-bottom: 60px;
}

/* Hero */
.hero {
    padding: 80px 0 60px;
    background: radial-gradient(ellipse at top, rgba(22, 163, 74, 0.08), transparent 60%);
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
}

.text-muted {
    color: var(--text-secondary);
}

.text-accent {
    color: var(--accent-light);
}

.hero-desc {
    color: var(--text-secondary);
    font-size: 1.1rem;
    margin-bottom: 32px;
    max-width: 480px;
}

.hero-actions {
    display: flex;
    gap: 16px;
}

.code-window {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 16px;
    background-color: var(--bg-elevated);
    border-bottom: 1px solid var(--border);
}

.dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.dot.red { background-color: #ef4444; }
.dot.yellow { background-color: #eab308; }
.dot.green { background-color: #22c55e; }

.code-title {
    margin-left: 8px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.code-body {
    padding: 20px;
    font-family: "SF Mono", "Fira Code", Consolas, monospace;
    font-size: 0.9rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

.code-body .kw { color: #c084fc; }
.code-body .str { color: #86efac; }
.code-body .num { color: #60a5fa; }
.code-body .fn { color: #fcd34d; }

/* Sections */
.section {
    padding: 60px 0;
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 32px;
    flex-wrap: wrap;
    gap: 16px;
}

.section-title {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--text);
}

.section-subtitle {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 20px;
}

/* Search */
.search-form {
    display: flex;
    gap: 8px;
    max-width: 360px;
    width: 100%;
}

.search-form .input {
    flex: 1;
}

/* Cards */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 32px;
    box-shadow: var(--shadow);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 24px;
}

/* Post List */
.post-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.post-card {
    position: relative;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: var(--transition);
}

.post-card:hover {
    border-color: rgba(22, 163, 74, 0.4);
    transform: translateY(-2px);
}

.post-card.pinned {
    border-left: 3px solid var(--accent);
}

.pin-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background-color: rgba(22, 163, 74, 0.15);
    color: var(--accent-light);
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 20px;
    font-weight: 500;
}

.post-meta-top {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.post-author {
    color: var(--text);
    font-weight: 600;
}

.post-category {
    background-color: var(--bg-elevated);
    color: var(--accent-light);
    font-size: 0.8rem;
    padding: 2px 8px;
    border-radius: 4px;
}

.post-time {
    color: var(--text-muted);
    font-size: 0.85rem;
}

.post-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.post-title a {
    color: var(--text);
}

.post-title a:hover {
    color: var(--accent-light);
}

.post-excerpt {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 16px;
}

.post-stats {
    display: flex;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.post-stats span {
    display: flex;
    align-items: center;
    gap: 4px;
}

/* Pagination */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 40px;
}

.page-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: 80px 20px;
    color: var(--text-secondary);
}

.empty-state p {
    margin-bottom: 20px;
    font-size: 1.1rem;
}

.empty-text {
    color: var(--text-muted);
    margin-bottom: 20px;
}

/* Auth */
.auth-section {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - 64px - 60px);
    padding: 40px 20px;
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px;
    box-shadow: var(--shadow);
}

.auth-logo {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.auth-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 28px;
}

.auth-form {
    margin-bottom: 20px;
}

.auth-footer {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.alert-error {
    background-color: rgba(220, 38, 38, 0.1);
    border: 1px solid rgba(220, 38, 38, 0.3);
    color: #fca5a5;
}

.alert-success {
    background-color: rgba(22, 163, 74, 0.1);
    border: 1px solid rgba(22, 163, 74, 0.3);
    color: #86efac;
}

/* Post Detail */
.post-detail {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    margin-bottom: 32px;
}

.post-detail-header {
    border-bottom: 1px solid var(--border);
    padding-bottom: 20px;
    margin-bottom: 24px;
}

.post-detail-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 12px 0 16px;
    line-height: 1.3;
}

.post-detail-body {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
    white-space: pre-wrap;
}

.post-actions {
    display: flex;
    gap: 10px;
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

/* Replies */
.replies-section {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
}

.reply-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-bottom: 28px;
}

.reply-card {
    padding: 20px;
    background-color: var(--bg-elevated);
    border-radius: 12px;
    border: 1px solid var(--border);
}

.reply-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 12px;
    flex-wrap: wrap;
}

.reply-author {
    color: var(--text);
    font-weight: 600;
}

.reply-floor {
    color: var(--accent-light);
    font-size: 0.8rem;
    font-weight: 600;
}

.reply-time {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.reply-body {
    color: var(--text-secondary);
    line-height: 1.7;
    white-space: pre-wrap;
}

.reply-form-wrap {
    padding-top: 24px;
    border-top: 1px solid var(--border);
}

.reply-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.reply-login-tip {
    text-align: center;
    padding: 24px;
    color: var(--text-secondary);
}

.reply-form .form-group {
    margin-bottom: 0;
}

.reply-form .editor-toolbar {
    margin-bottom: 0;
}

/* Avatars */
.avatar-xs,
.avatar-sm,
.avatar-lg {
    border-radius: 50%;
    object-fit: cover;
    background-color: var(--bg-elevated);
}

.avatar-xs {
    width: 28px;
    height: 28px;
}

.avatar-sm {
    width: 38px;
    height: 38px;
}

.avatar-lg {
    width: 80px;
    height: 80px;
}

.avatar-group {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

/* Admin */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 40px;
}

.stat-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 24px;
    transition: var(--transition);
}

.stat-card:hover {
    border-color: rgba(22, 163, 74, 0.4);
}

.stat-icon {
    color: var(--accent);
    margin-bottom: 12px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.admin-actions {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.admin-action-card {
    display: flex;
    align-items: center;
    gap: 16px;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 28px;
    color: var(--text);
    font-size: 1.1rem;
    font-weight: 600;
    transition: var(--transition);
}

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

/* Tables */
.table-card {
    overflow-x: auto;
    padding: 0;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.data-table th,
.data-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background-color: var(--bg-elevated);
    color: var(--text-secondary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

.data-table tbody tr:hover {
    background-color: var(--bg-hover);
}

.table-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.badge {
    display: inline-block;
    padding: 3px 10px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
}

.badge-primary {
    background-color: rgba(96, 165, 250, 0.15);
    color: #93c5fd;
}

.badge-secondary {
    background-color: var(--bg-elevated);
    color: var(--text-secondary);
}

.badge-success {
    background-color: rgba(22, 163, 74, 0.15);
    color: var(--accent-light);
}

.badge-danger {
    background-color: rgba(220, 38, 38, 0.15);
    color: #fca5a5;
}

/* Footer */
.footer {
    background-color: var(--bg-elevated);
    border-top: 1px solid var(--border);
    padding: 24px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 900px) {
    .hero-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-visual {
        order: -1;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background-color: var(--bg-card);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        align-items: flex-start;
        padding: 16px 24px;
        gap: 12px;
        display: none;
    }

    .nav-links.active {
        display: flex;
    }

    .nav-user {
        gap: 8px;
    }

    .nav-user .btn-sm {
        padding: 5px 10px;
        font-size: 0.8rem;
    }

    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .search-form {
        max-width: 100%;
    }

    .hero {
        padding: 40px 0;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .auth-card,
    .card {
        padding: 24px;
    }

    .post-detail,
    .replies-section {
        padding: 20px;
    }

    .post-detail-title {
        font-size: 1.4rem;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .admin-actions {
        grid-template-columns: 1fr;
    }

    .data-table {
        min-width: 800px;
    }

    .form-actions {
        flex-direction: column;
    }
}

/* Post images */
.post-image {
    display: block;
    max-width: 100%;
    border-radius: var(--radius);
    margin: 16px 0;
    border: 1px solid var(--border);
}

.post-detail-body img {
    max-width: 100%;
    height: auto;
}

/* Editor toolbar */
.editor-toolbar {
    position: relative;
    margin-bottom: 8px;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.875rem;
}

.emoji-picker {
    display: none;
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    z-index: 10;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 10px;
    box-shadow: var(--shadow);
    grid-template-columns: repeat(8, 1fr);
    gap: 6px;
    width: max-content;
    max-width: 300px;
}

.emoji-picker.active {
    display: grid;
}

.emoji {
    cursor: pointer;
    font-size: 1.25rem;
    text-align: center;
    padding: 4px;
    border-radius: 4px;
    transition: var(--transition);
}

.emoji:hover {
    background-color: var(--bg-hover);
}

.form-hint {
    color: var(--text-muted);
    font-size: 0.8rem;
    margin-top: 6px;
}