:root {
    --bg: #f5f5f5;
    --card-bg: #fff;
    --text: #333;
    --text-light: #666;
    --text-muted: #999;
    --primary: #2c3e50;
    --accent: #3498db;
    --accent-hover: #2980b9;
    --border: #e0e0e0;
    --danger: #e74c3c;
    --success: #27ae60;
    --warning: #f39c12;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(0,0,0,0.06);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ── Navbar ── */
.navbar {
    background: var(--primary);
    padding: 0 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.nav-container {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 56px;
}

.nav-brand {
    color: #fff;
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;
}

.nav-links a {
    color: #bdc3c7;
    text-decoration: none;
    margin-left: 1.5rem;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-links a:hover { color: #fff; }

/* ── Container ── */
.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem 1rem;
    flex: 1;
}

/* ── Flash ── */
.flash-container {
    max-width: 900px;
    margin: 1rem auto 0;
    padding: 0 1rem;
}

.flash {
    padding: 0.75rem 1rem;
    border-radius: var(--radius);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.flash-success { background: #d4edda; color: #155724; }
.flash-error { background: #f8d7da; color: #721c24; }
.flash-warning { background: #fff3cd; color: #856404; }
.flash-info { background: #d1ecf1; color: #0c5460; }

/* ── Post Card ── */
.post-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    overflow: hidden;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
    transition: box-shadow 0.2s;
}

.post-card:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.1); }

.post-cover img {
    width: 100%;
    height: 240px;
    object-fit: cover;
}

.post-body { padding: 1.5rem 2rem; }

.post-body h2 { font-size: 1.4rem; margin-bottom: 0.4rem; }
.post-body h2 a { color: var(--text); text-decoration: none; }
.post-body h2 a:hover { color: var(--accent); }

.post-meta {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
}

.post-summary {
    color: var(--text-light);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.read-more {
    color: var(--accent);
    text-decoration: none;
    font-size: 0.9rem;
}

.read-more:hover { text-decoration: underline; }

/* ── Post Full ── */
.post-full {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 2.5rem;
    box-shadow: var(--shadow);
}

.post-header {
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
}

.post-header h1 { font-size: 2rem; line-height: 1.4; }

.post-nav { margin-top: 1.5rem; }
.post-nav a { color: var(--accent); text-decoration: none; }
.post-nav a:hover { text-decoration: underline; }

/* ── Markdown Body ── */
.markdown-body { line-height: 1.9; }
.markdown-body h1, .markdown-body h2, .markdown-body h3 { margin: 1.5rem 0 0.8rem; }
.markdown-body h1 { font-size: 1.6rem; }
.markdown-body h2 { font-size: 1.35rem; }
.markdown-body h3 { font-size: 1.15rem; }
.markdown-body p { margin-bottom: 1rem; }
.markdown-body img { max-width: 100%; border-radius: 4px; margin: 1rem 0; }
.markdown-body blockquote {
    border-left: 4px solid var(--accent);
    padding: 0.5rem 1rem;
    margin: 1rem 0;
    background: #f9f9f9;
    color: var(--text-light);
}
.markdown-body code {
    background: #f0f0f0;
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    font-size: 0.9em;
}
.markdown-body pre {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 1rem;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 1rem 0;
}
.markdown-body pre code {
    background: none;
    padding: 0;
    color: inherit;
}
.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: 1rem 0;
}
.markdown-body th, .markdown-body td {
    border: 1px solid var(--border);
    padding: 0.5rem 0.75rem;
    text-align: left;
}
.markdown-body th { background: #f5f5f5; }
.markdown-body a { color: var(--accent); }
.markdown-body ul, .markdown-body ol { padding-left: 1.5rem; margin-bottom: 1rem; }

/* ── Login ── */
.login-box {
    max-width: 400px;
    margin: 4rem auto;
    background: var(--card-bg);
    padding: 2.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.login-box h2 {
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--primary);
}

/* ── Forms ── */
.form-group {
    margin-bottom: 1.2rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 500;
    font-size: 0.9rem;
}

.form-group input[type="text"],
.form-group input[type="password"],
.form-group textarea {
    width: 100%;
    padding: 0.65rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(52,152,219,0.1);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

/* ── Buttons ── */
.btn {
    display: inline-block;
    padding: 0.55rem 1.2rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--card-bg);
    color: var(--text);
    font-size: 0.9rem;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

.btn:hover { background: #f0f0f0; }

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

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

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

.btn-danger:hover { background: #c0392b; }

.btn-small { padding: 0.3rem 0.8rem; font-size: 0.82rem; }

.btn-block { width: 100%; text-align: center; }

/* ── Admin ── */
.admin-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.admin-section {
    background: var(--card-bg);
    border-radius: var(--radius);
    padding: 1.5rem 2rem;
    margin-bottom: 1.5rem;
    box-shadow: var(--shadow);
}

.admin-section h3 { margin-bottom: 1rem; }

.password-form {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.password-form input {
    flex: 1;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 0.9rem;
}

.post-table {
    width: 100%;
    border-collapse: collapse;
}

.post-table th, .post-table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

.post-table th { font-weight: 600; font-size: 0.85rem; color: var(--text-muted); }
.post-table a { color: var(--accent); text-decoration: none; }
.post-table a:hover { text-decoration: underline; }

.actions { display: flex; gap: 0.5rem; align-items: center; }

.inline-form { display: inline; }

.badge {
    display: inline-block;
    padding: 0.15rem 0.6rem;
    border-radius: 12px;
    font-size: 0.78rem;
    font-weight: 500;
}

.badge-published { background: #d4edda; color: #155724; }
.badge-draft { background: #fff3cd; color: #856404; }

.empty-text { color: var(--text-muted); }
.empty-text a { color: var(--accent); }

/* ── Editor ── */
.editor-page h1 { margin-bottom: 1.5rem; }

.editor-form {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.form-actions {
    display: flex;
    gap: 0.75rem;
    margin-top: 1rem;
}

.upload-section {
    margin-top: 2rem;
    background: var(--card-bg);
    padding: 1.5rem 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.upload-section h3 { margin-bottom: 0.5rem; }
.upload-section p { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 0.75rem; }
.upload-section input[type="file"] { margin-right: 0.5rem; }

.upload-success { color: var(--success); margin-top: 0.5rem; font-size: 0.85rem; }
.upload-error { color: var(--danger); margin-top: 0.5rem; font-size: 0.85rem; }

/* ── Empty State ── */
.empty-state {
    text-align: center;
    padding: 4rem 1rem;
    color: var(--text-muted);
}

.empty-state h2 { margin-bottom: 0.5rem; }

/* ── Footer ── */
.footer {
    text-align: center;
    padding: 1.5rem;
    color: var(--text-muted);
    font-size: 0.82rem;
    border-top: 1px solid var(--border);
}

.footer a { color: var(--text-muted); text-decoration: none; }
.footer a:hover { text-decoration: underline; }

/* ── Responsive ── */
@media (max-width: 640px) {
    .post-body { padding: 1rem 1.2rem; }
    .post-full { padding: 1.5rem; }
    .post-header h1 { font-size: 1.5rem; }
    .admin-header { flex-direction: column; gap: 1rem; align-items: flex-start; }
    .post-table { font-size: 0.85rem; }
    .post-table th:nth-child(3), .post-table td:nth-child(3) { display: none; }
}