:root {
    --primary: #0057FF;
    --primary-dark: #0040CC;
    --accent: #00E5FF;
    --dark: #050D1A;
    --dark2: #0A1628;
    --card: #0D1F3C;
    --text: #E8F0FE;
    --muted: #7B9CC4;
    --green: #00E676;
    --border: rgba(0,87,255,0.2);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Inter', sans-serif;
    background: var(--dark);
    color: var(--text);
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: var(--dark2);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
}
.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border);
}
.logo {
    display: flex;
    align-items: center;
    gap: 12px;
}
.logo-icon {
    width: 32px; height: 32px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 8px;
    display: flex; align-items: center; justify-content: center;
}
.logo-text {
    font-weight: 800; font-size: 18px; color: #fff;
}
.logo-text .accent { color: var(--accent); }

.nav-menu {
    list-style: none;
    padding: 20px 0;
    flex: 1;
}
.nav-menu li {
    padding: 4px 20px;
}
.nav-menu a {
    display: block;
    padding: 12px 16px;
    color: var(--muted);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.2s;
}
.nav-menu li.active a, .nav-menu a:hover {
    background: var(--primary);
    color: #fff;
}
.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--border);
}
.logout-btn {
    display: block;
    text-align: center;
    padding: 12px;
    background: rgba(255,0,0,0.1);
    color: #ff4d4d;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
}

.main-content {
    margin-left: 260px;
    flex: 1;
    padding: 40px;
}
.top-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
}
.header-left h1 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 4px;
}
.header-left p {
    color: var(--muted);
    font-size: 14px;
}
.header-right {
    display: flex;
    align-items: center;
    gap: 20px;
}
.status-badge {
    background: rgba(0,230,118,0.1);
    border: 1px solid var(--green);
    color: var(--green);
    padding: 6px 12px;
    border-radius: 50px;
    font-size: 13px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}
.status-badge .dot {
    width: 8px; height: 8px;
    background: var(--green);
    border-radius: 50%;
    animation: pulse 2s infinite;
}
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
.avatar {
    width: 40px; height: 40px;
    border-radius: 50%;
    background: var(--card);
    border: 2px solid var(--primary);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}
.stat-card {
    background: var(--card);
    border: 1px solid var(--border);
    padding: 24px;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.stat-card.highlight {
    background: linear-gradient(160deg, rgba(0,87,255,0.15), var(--card));
    border-color: var(--primary);
}
.stat-label {
    color: var(--muted);
    font-size: 13px;
    font-weight: 500;
}
.stat-value {
    font-size: 28px;
    font-weight: 800;
    color: #fff;
}
.stat-footer {
    font-size: 12px;
    color: var(--muted);
    margin-bottom: 16px;
}
.btn-pay {
    background: var(--primary);
    color: #fff;
    text-align: center;
    padding: 12px;
    border-radius: 10px;
    text-decoration: none;
    font-weight: 700;
    transition: 0.2s;
}
.btn-pay:hover { background: var(--primary-dark); }
.btn-link {
    color: var(--accent);
    text-decoration: none;
    font-size: 13px;
    font-weight: 600;
}

.content-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 24px;
}
.table-container {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
}
.table-container h3 {
    margin-bottom: 20px;
    font-size: 18px;
}
table {
    width: 100%;
    border-collapse: collapse;
}
th {
    text-align: left;
    color: var(--muted);
    font-size: 13px;
    padding: 12px;
    border-bottom: 1px solid var(--border);
}
td {
    padding: 16px 12px;
    font-size: 14px;
    border-bottom: 1px solid rgba(0,87,255,0.05);
}
.status {
    padding: 4px 10px;
    border-radius: 50px;
    font-size: 11px;
    font-weight: 700;
}
.status.paid {
    background: rgba(0,230,118,0.1);
    color: var(--green);
    border: 1px solid var(--green);
}

.quick-actions {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
}
.quick-actions h3 {
    margin-bottom: 20px;
    font-size: 18px;
}
.action-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.action-item {
    background: rgba(255,255,255,0.03);
    border: 1px solid var(--border);
    padding: 16px;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    text-align: left;
    transition: 0.2s;
    color: var(--text);
    font-family: inherit;
}
.action-item:hover {
    background: rgba(0,87,255,0.1);
    border-color: var(--primary);
    transform: translateX(4px);
}
.action-icon {
    font-size: 20px;
}
.action-text {
    font-size: 14px;
    font-weight: 500;
}

@media (max-width: 1024px) {
    .sidebar { width: 80px; }
    .sidebar-header .logo-text, .nav-menu a span, .sidebar-footer .logout-btn span { display: none; }
    .main-content { margin-left: 80px; }
    .content-grid { grid-template-columns: 1fr; }
}