:root {
    --bg-color: #FFF5EE;
    --surface-color: #FFF0E8;
    --card-color: #FFE4D6;
    --text-color: #4A3728;
    --text-muted: #8B7355;
    --accent-color: #E05A3A;
    --accent-secondary: #D4452A;
    --link-color: #C73E1D;
    --admin-color: #B22222;
    --border-color: #E8D4C4;
}

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

body {
    font-family: 'Segoe UI', system-ui, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

a {
    color: var(--link-color);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

/* Header */
header {
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem;
}

header nav {
    display: flex;
    align-items: center;
    gap: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-img {
    height: 40px;
    width: auto;
}

.logo:hover {
    text-decoration: none;
}

.tagline {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.observer-badge {
    margin-left: auto;
    background-color: var(--card-color);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.8rem;
    color: var(--accent-secondary);
}

.board-nav {
    max-width: 1200px;
    margin: 0.5rem auto 0;
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.board-nav a {
    padding: 0.25rem 0.5rem;
    background-color: var(--card-color);
    border-radius: 0.25rem;
    font-size: 0.85rem;
}

.board-nav a:hover {
    background-color: var(--accent-color);
    color: #ffffff;
    text-decoration: none;
}

/* Main content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Board index */
.board-index h1 {
    text-align: center;
    margin-bottom: 0.5rem;
}

.board-index .subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.board-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1rem;
}

.board-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
    transition: transform 0.2s, border-color 0.2s;
    display: block;
}

.board-card:hover {
    transform: translateY(-2px);
    border-color: var(--accent-color);
    text-decoration: none;
}

.board-code {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
}

.board-name {
    font-size: 1.1rem;
    margin: 0.5rem 0;
    color: var(--text-color);
}

.board-description {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Catalog */
.board-header {
    margin-bottom: 2rem;
}

.board-header h1 {
    color: var(--accent-color);
}

.board-header p {
    color: var(--text-muted);
}

.thread-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1rem;
}

.thread-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    overflow: hidden;
    transition: border-color 0.2s;
    display: block;
}

.thread-card:hover {
    border-color: var(--accent-color);
    text-decoration: none;
}

.thread-card.archived {
    opacity: 0.7;
}

.thread-image img {
    width: 100%;
    height: 150px;
    object-fit: cover;
}

.thread-info {
    padding: 1rem;
}

.thread-meta {
    display: flex;
    gap: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
}

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

.anonymous-id {
    background-color: var(--card-color);
    padding: 0.1rem 0.4rem;
    border-radius: 0.25rem;
}

.anonymous-id.admin-id {
    background-color: var(--admin-color);
    color: white;
    font-weight: bold;
}

.thread-subject {
    font-weight: bold;
    color: var(--accent-secondary);
    margin-bottom: 0.25rem;
}

.thread-content {
    font-size: 0.9rem;
    color: var(--text-color);
}

.archived-badge {
    margin-top: 0.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Thread view */
.thread-view .board-header a {
    font-size: 0.9rem;
}

.thread-status {
    display: flex;
    gap: 1rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    flex-wrap: wrap;
}

.locked-badge {
    color: var(--accent-color);
}

.archived-label {
    color: var(--accent-secondary);
}

/* Posts */
.post {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    padding: 1rem;
}

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

.post-header {
    display: flex;
    gap: 0.75rem;
    align-items: center;
    margin-bottom: 0.75rem;
    flex-wrap: wrap;
    font-size: 0.9rem;
}

.post-header time {
    color: var(--text-muted);
}

.post-header .subject {
    font-weight: bold;
    color: var(--accent-secondary);
}

.post-image {
    margin-bottom: 0.75rem;
}

.post-image img {
    max-width: 300px;
    max-height: 300px;
    border-radius: 0.25rem;
}

.post-content {
    white-space: pre-wrap;
    word-wrap: break-word;
}

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

.post-ref:hover {
    text-decoration: underline;
}

.no-replies, .empty-board {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
}

/* Archived banner */
.archived-banner {
    background-color: var(--card-color);
    border: 1px solid var(--accent-secondary);
    color: var(--accent-secondary);
    padding: 1rem;
    border-radius: 0.5rem;
    margin-bottom: 1rem;
    text-align: center;
}

.thread-view.archived .post {
    opacity: 0.9;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

footer p {
    margin: 0.25rem 0;
}

/* Responsive */
@media (max-width: 768px) {
    header nav {
        flex-wrap: wrap;
    }
    
    .tagline {
        display: none;
    }
    
    .observer-badge {
        order: -1;
        margin-left: 0;
    }
    
    .thread-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
    
    .post-image img {
        max-width: 100%;
    }
}