:root {
    --primary-color: #4A5568;
    --accent-color: #ED8936;
    --success-color: #38A169;
    --danger-color: #E53E3E;
    --info-color: #3182CE;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f8f9fa;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding: 2rem 0;
}

.post-content {
    line-height: 1.8;
    font-size: 16px;
}

.post-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 1rem 0;
}

.post-content p {
    margin-bottom: 1rem;
}

.post-content ul, .post-content ol {
    margin-bottom: 1rem;
    padding-left: 1.5rem;
}

.post-content h1, .post-content h2, .post-content h3 {
    margin-top: 1.5rem;
    margin-bottom: 1rem;
}

.post-content a {
    color: var(--accent-color);
}

.navbar-brand {
    font-weight: bold;
    color: var(--accent-color) !important;
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255, 255, 255, 0.85);
    transition: color 0.3s;
}

.navbar-dark .navbar-nav .nav-link:hover {
    color: var(--accent-color);
}

.card {
    border: none;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s, box-shadow 0.3s;
    margin-bottom: 1.5rem;
    position: relative;
}

.card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.12);
}

.card-header {
    background-color: white;
    border-bottom: 2px solid #f1f1f1;
    font-weight: 600;
}

.card .post-title {
    color: var(--primary-color);
    text-decoration: none;
    position: relative;
    z-index: 10;
}

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

.category-badge {
    font-size: 0.75rem;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

.category-租房经验 { background-color: #FED7D7; color: #C53030; }
.category-工作交流 { background-color: #C6F6D5; color: #276749; }
.category-生活吐槽 { background-color: #BEE3F8; color: #2B6CB0; }
.category-情感树洞 { background-color: #E9D8FD; color: #6B46C1; }
.category-北京攻略 { background-color: #FEEBC8; color: #C05621; }
.category-求职招聘 { background-color: #C4F1F9; color: #0987A0; }

.tag-badge {
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    margin-right: 0.25rem;
    border-radius: 8px;
    display: inline-block;
    margin-bottom: 0.25rem;
}

.btn-accent {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: white;
}

.btn-accent:hover {
    background-color: #DD6B20;
    border-color: #DD6B20;
    color: white;
}

.topic-card {
    background: linear-gradient(135deg, var(--accent-color), #DD6B20);
    border-radius: 12px;
    padding: 1.5rem;
    transition: transform 0.2s, box-shadow 0.2s;
}

.topic-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(237, 137, 54, 0.4);
    color: white;
}

.topic-card .topic-title {
    font-size: 1.1rem;
    font-weight: bold;
    margin-bottom: 0.5rem;
}

.topic-card .topic-desc {
    opacity: 0.9;
    font-size: 0.85rem;
    margin-bottom: 0.5rem;
}

.search-highlight {
    background-color: #FEF3C7;
    padding: 0 2px;
    border-radius: 2px;
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--accent-color);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.comment-area {
    background-color: #f8f9fa;
    border-radius: 8px;
    padding: 1rem;
    margin-top: 1rem;
}

.comment-item {
    border-left: 3px solid var(--accent-color);
    padding-left: 1rem;
    margin-bottom: 1rem;
}

.comment-reply {
    margin-left: 2rem;
    border-left-color: var(--info-color);
}

.form-control:focus {
    border-color: var(--accent-color);
    box-shadow: 0 0 0 0.2rem rgba(237, 137, 54, 0.25);
}

.badge.bg-warning.text-dark {
    font-size: 0.65rem;
}

.sidebar-widget {
    background: white;
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.sidebar-widget h5 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent-color);
}

.anonymous-badge {
    font-size: 0.7rem;
    background-color: #718096;
    color: white;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
    margin-left: 0.5rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: bold;
    color: var(--accent-color);
}

.page-link {
    color: var(--accent-color);
}

.page-link:hover {
    color: #DD6B20;
}

.page-item.active .page-link {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}

@media (max-width: 768px) {
    .navbar-brand {
        font-size: 1rem;
    }

    .card {
        border-radius: 8px;
    }

    .topic-card {
        margin-bottom: 1rem;
    }
}