:root {
    --primary: #4A90D9;
    --primary-hover: #3a7bc8;
    --danger: #E74C3C;
    --danger-hover: #c0392b;
    --success: #27AE60;
    --success-hover: #219a52;
    --warning: #F39C12;
    --purple: #8E44AD;
    --dark: #1a1a2e;
    --dark-light: #16213e;
    --bg: #f0f2f5;
    --white: #ffffff;
    --border: #e1e4e8;
    --text: #24292e;
    --text-secondary: #586069;
    --text-light: #8b949e;
    --shadow: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --radius: 8px;
}

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

body {
    background: var(--bg);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--text);
    line-height: 1.6;
    font-size: 14px;
}

a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* Layout */
.sidebar {
    position: fixed; top: 0; left: 0; bottom: 0; width: 220px;
    background: var(--dark); color: #fff; display: flex; flex-direction: column;
    z-index: 100; transition: transform 0.2s;
}
.sidebar-brand {
    padding: 20px; font-size: 16px; font-weight: 700;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    letter-spacing: 0.5px;
}
.sidebar-nav { flex: 1; padding: 12px 0; }
.sidebar-nav a {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 20px; color: rgba(255,255,255,0.7);
    font-size: 14px; transition: all 0.15s; text-decoration: none;
}
.sidebar-nav a:hover { color: #fff; background: rgba(255,255,255,0.06); }
.sidebar-nav a.active { color: #fff; background: rgba(255,255,255,0.1); border-right: 3px solid var(--primary); }
.sidebar-user {
    padding: 16px 20px; border-top: 1px solid rgba(255,255,255,0.08);
    font-size: 13px; color: rgba(255,255,255,0.6);
    display: flex; justify-content: space-between; align-items: center;
}
.sidebar-user .logout-btn {
    background: none; border: none; color: rgba(255,255,255,0.5);
    cursor: pointer; font-size: 13px; padding: 4px 8px; border-radius: 4px;
}
.sidebar-user .logout-btn:hover { color: #fff; background: rgba(255,255,255,0.1); }

.main-content { margin-left: 220px; padding: 24px 32px; min-height: 100vh; }
.page-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 24px;
}
.page-header h1 { font-size: 22px; font-weight: 600; }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 16px; font-size: 13px; font-weight: 500;
    border: 1px solid var(--border); border-radius: 6px;
    cursor: pointer; background: var(--white); color: var(--text);
    transition: all 0.15s; line-height: 1.4; text-decoration: none;
}
.btn:hover { background: #f6f8fa; text-decoration: none; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { background: var(--danger); color: #fff; border-color: var(--danger); }
.btn-danger:hover { background: var(--danger-hover); }
.btn-success { background: var(--success); color: #fff; border-color: var(--success); }
.btn-success:hover { background: var(--success-hover); }
.btn-sm { padding: 5px 10px; font-size: 12px; }
.btn-group { display: flex; gap: 6px; }

/* Cards */
.card { background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); padding: 24px; }
.stats-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card {
    background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow);
    padding: 20px; text-align: center;
}
.stat-card .stat-value { font-size: 32px; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { font-size: 13px; color: var(--text-light); margin-top: 4px; }

/* Table */
.table-wrap { background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow); overflow: hidden; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 13px; }
th { background: #f6f8fa; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; font-size: 11px; letter-spacing: 0.5px; }
tbody tr:hover { background: #f8f9fb; }

/* Badges */
.badge {
    display: inline-block; padding: 2px 8px; font-size: 11px; font-weight: 600;
    border-radius: 10px; color: #fff; line-height: 1.6;
}
.badge-feature { background: var(--primary); }
.badge-bugfix { background: var(--danger); }
.badge-improvement { background: var(--success); }
.badge-breaking { background: var(--warning); }
.badge-security { background: var(--purple); }
.badge-draft { background: var(--text-light); }
.badge-published { background: var(--success); }
.badge-active { background: var(--success); }
.badge-archived { background: var(--text-light); }
.badge-minor { background: #6c757d; }
.badge-major { background: var(--warning); }
.badge-critical { background: var(--danger); }

/* Forms */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; font-size: 13px; color: var(--text-secondary); }
.form-control {
    width: 100%; padding: 9px 12px; font-size: 14px;
    border: 1px solid var(--border); border-radius: 6px;
    background: var(--white); color: var(--text); outline: none;
    transition: border-color 0.15s, box-shadow 0.15s;
}
.form-control:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(74,144,217,0.12); }
textarea.form-control { min-height: 150px; resize: vertical; font-family: inherit; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-actions { display: flex; gap: 8px; margin-top: 20px; }

/* Modal */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.4);
    display: flex; align-items: center; justify-content: center;
    z-index: 1000; animation: fadeIn 0.15s;
}
.modal {
    background: var(--white); border-radius: 12px; padding: 28px;
    width: 90%; max-width: 560px; max-height: 85vh; overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0,0,0,0.15); animation: slideUp 0.2s;
}
.modal h2 { margin-bottom: 20px; font-size: 18px; }
.modal-footer { display: flex; gap: 8px; justify-content: flex-end; margin-top: 24px; }

/* Login */
.login-wrap {
    display: flex; align-items: center; justify-content: center;
    min-height: 100vh; padding: 20px;
}
.login-box { width: 100%; max-width: 380px; }
.login-box h1 { text-align: center; margin-bottom: 8px; font-size: 22px; color: var(--dark); }
.login-box .subtitle { text-align: center; color: var(--text-light); margin-bottom: 28px; font-size: 14px; }
.login-box .error-msg { color: var(--danger); text-align: center; margin-bottom: 12px; font-size: 13px; }

/* Toast */
.toast {
    position: fixed; top: 20px; right: 20px; padding: 12px 20px;
    border-radius: 8px; font-size: 13px; font-weight: 500;
    color: #fff; z-index: 2000; box-shadow: var(--shadow-md);
    animation: slideIn 0.3s; max-width: 360px;
}
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }

/* Empty state */
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-light); }
.empty-state p { font-size: 15px; margin-bottom: 16px; }

/* Animations */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes slideIn { from { opacity: 0; transform: translateX(40px); } to { opacity: 1; transform: translateX(0); } }

/* Responsive */
@media (max-width: 768px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-content { margin-left: 0; padding: 16px; }
    .form-row { grid-template-columns: 1fr; }
    .page-header { flex-direction: column; align-items: flex-start; gap: 12px; }
    .stats-row { grid-template-columns: 1fr; }
    th, td { padding: 8px 10px; }
}