:root {
    --primary: #ef4444;
    --primary-dark: #dc2626;
    --accent: #f97415;
    --danger: #ef4444;
    --warning: #f97415;
    --success: #1e8e3e;
    --text: #f9fafb;
    --text-secondary: #9cbac9;
    --border: #477085;
    --bg: #024f6e;
    --card-bg: #054057;
    --sidebar-bg: #032d3e;
    --sidebar-text: #f9fafb;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    display: flex;
    min-height: 100vh;
}

/* ─── Sidebar ──────────────────────────────────────────────── */

.sidebar {
    width: 240px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--border);
}

.sidebar-header {
    display: flex;
    align-items: center;
    gap: 12px;
}

.sidebar-logo {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

.sidebar-header h1 {
    font-size: 16px;
    font-weight: 600;
}

.sidebar-header-text p {
    font-size: 11px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.sidebar-nav {
    flex: 1;
    padding: 12px 0;
}

.sidebar-nav a {
    display: block;
    padding: 10px 20px;
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 14px;
    transition: background 0.15s;
}

.sidebar-nav a:hover {
    background: rgba(255,255,255,0.08);
}

.sidebar-nav a.active {
    background: rgba(239,68,68,0.15);
    color: var(--primary);
    border-left: 3px solid var(--primary);
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--border);
    font-size: 12px;
}

.sidebar-footer .user-name {
    font-weight: 600;
}

.sidebar-footer button {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 12px;
    padding: 0;
    margin-top: 4px;
}

.sidebar-footer button:hover {
    color: var(--text);
}

/* ─── Main content ─────────────────────────────────────────── */

.main {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.topbar {
    padding: 16px 24px;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.topbar h2 {
    font-size: 20px;
    font-weight: 500;
}

.content {
    padding: 24px;
    flex: 1;
}

/* ─── Notifications ────────────────────────────────────────── */

.notification {
    padding: 12px 16px;
    margin-bottom: 16px;
    border-radius: 6px;
    font-size: 14px;
    display: none;
}

.notification.error {
    background: rgba(239,68,68,0.15);
    color: #fca5a5;
    border: 1px solid rgba(239,68,68,0.3);
}

.notification.success {
    background: rgba(30,142,62,0.15);
    color: #86efac;
    border: 1px solid rgba(30,142,62,0.3);
}

.notification.visible {
    display: block;
}

/* ─── Stats cards ──────────────────────────────────────────── */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}

.stat-card {
    background: var(--card-bg);
    border-radius: 8px;
    padding: 20px;
    border: 1px solid var(--border);
}

.stat-value {
    font-size: 32px;
    font-weight: 600;
    color: var(--primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.stat-detail {
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 2px;
}

/* ─── Tables ───────────────────────────────────────────────── */

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.data-table th,
.data-table td {
    padding: 10px 14px;
    text-align: left;
    font-size: 13px;
    border-bottom: 1px solid var(--border);
}

.data-table th {
    background: var(--sidebar-bg);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table tr:hover {
    background: rgba(255,255,255,0.03);
}

.data-table tr.removed {
    opacity: 0.5;
}

.data-table tr.expired td {
    color: var(--text-secondary);
}

.sortable th[data-sort] {
    cursor: pointer;
    user-select: none;
    position: relative;
    padding-right: 20px;
}

.sortable th[data-sort]:hover {
    color: var(--text);
}

.sortable th[data-sort]::after {
    content: '\2195';
    position: absolute;
    right: 6px;
    opacity: 0.3;
    font-size: 10px;
}

.sortable th.sort-asc::after {
    content: '\25B2';
    opacity: 0.8;
}

.sortable th.sort-desc::after {
    content: '\25BC';
    opacity: 0.8;
}

.data-table a {
    color: var(--accent);
    text-decoration: none;
}

.data-table a:hover {
    text-decoration: underline;
}

/* ─── Badges ───────────────────────────────────────────────── */

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

.badge-trial { background: rgba(239,68,68,0.15); color: #fca5a5; }
.badge-student { background: rgba(249,116,21,0.15); color: #fdba74; }
.badge-active { background: rgba(30,142,62,0.15); color: #86efac; }
.badge-expired { background: rgba(239,68,68,0.1); color: #f87171; }
.badge-removed { background: rgba(71,112,133,0.3); color: var(--text-secondary); }

/* ─── Buttons ──────────────────────────────────────────────── */

.btn {
    padding: 8px 16px;
    border-radius: 4px;
    border: 1px solid var(--border);
    background: var(--card-bg);
    color: var(--text);
    font-size: 13px;
    cursor: pointer;
    transition: background 0.15s;
}

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

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

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

.btn-secondary {
    background: var(--card-bg);
    color: var(--accent);
    border-color: var(--accent);
}

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

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

.btn-small {
    padding: 4px 10px;
    font-size: 12px;
}

.btn-inline {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 12px;
    cursor: pointer;
    padding: 0;
    margin-left: 8px;
}

.btn-inline:hover { text-decoration: underline; }

/* ─── Detail view ──────────────────────────────────────────── */

.detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}

.detail-header h2 {
    font-size: 18px;
}

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

.detail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 12px;
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 20px;
    margin-bottom: 24px;
}

.detail-field label {
    display: block;
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.detail-field span {
    font-size: 14px;
}

/* ─── Filters ──────────────────────────────────────────────── */

.filters {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    align-items: center;
    flex-wrap: wrap;
}

.filters input[type="text"] {
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 13px;
    background: var(--card-bg);
    color: var(--text);
    min-width: 250px;
}

.filters input[type="text"]::placeholder {
    color: var(--text-secondary);
}

.filters select {
    padding: 6px 10px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 13px;
    background: var(--card-bg);
    color: var(--text);
}

.filters .count {
    color: var(--text-secondary);
    font-size: 13px;
    margin-left: auto;
}

/* ─── Views ────────────────────────────────────────────────── */

.view { display: none; }
.view.active { display: block; }

/* ─── Login screen ─────────────────────────────────────────── */

.login-screen {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    width: 100%;
    background: var(--bg);
}

.login-card {
    background: var(--card-bg);
    padding: 48px;
    border-radius: 8px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.3);
    text-align: center;
    max-width: 400px;
    border: 1px solid var(--border);
}

.login-logo {
    width: 80px;
    height: 80px;
    margin-bottom: 16px;
}

.login-card h1 {
    font-size: 22px;
    margin-bottom: 8px;
}

.login-card p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 14px;
}

h2 {
    font-size: 20px;
    font-weight: 500;
    margin-bottom: 16px;
}

h3 {
    font-size: 16px;
    font-weight: 500;
    margin-bottom: 12px;
    margin-top: 8px;
}