:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;
    --bg-hover: #334155;

    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;

    --border-color: #334155;
    --border-hover: #475569;

    --accent-primary: #3b82f6;
    --accent-secondary: #60a5fa;
    --accent-gradient: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);

    --success: #10b981;
    --success-bg: #064e3b;
    --success-border: #065f46;

    --error: #ef4444;
    --error-bg: #7f1d1d;
    --error-border: #991b1b;

    --warning: #f59e0b;
    --warning-bg: #78350f;
    --warning-border: #92400e;

    --info: #06b6d4;
    --info-bg: #164e63;
    --info-border: #155e75;

    --sidebar-bg: linear-gradient(180deg, #1e3a8a 0%, #1e40af 100%);

    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
}

.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: 280px;
    height: 100vh;
    background: var(--sidebar-bg);
    color: white;
    padding: 30px 0;
    z-index: 1000;
    transition: transform 0.3s ease;
    box-shadow: var(--shadow-lg);
}

.sidebar .logo {
    text-align: center;
    padding: 0 30px 30px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    margin-bottom: 30px;
}

.sidebar .logo h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
}

.sidebar .logo p {
    opacity: 0.9;
    font-size: 0.9rem;
    margin-top: 5px;
    color: rgba(255,255,255,0.8);
}

.sidebar nav ul {
    list-style: none;
}

.sidebar nav a {
    display: block;
    color: white;
    text-decoration: none;
    padding: 15px 30px;
    transition: all 0.3s ease;
    border-left: 3px solid transparent;
}

.sidebar nav a:hover,
.sidebar nav a.active {
    background: rgba(255,255,255,0.15);
    border-left-color: white;
}

.sidebar nav a i {
    width: 20px;
    margin-right: 15px;
}

.main-content {
    margin-left: 280px;
    padding: 30px;
    min-height: 100vh;
}

.header {
    background: var(--bg-card);
    padding: 20px 30px;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
}

.header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    text-align: center;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
    border-color: var(--accent-primary);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--accent-gradient);
}

.stat-card .icon {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.8;
}

.stat-card .number {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.stat-card .label {
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

.chart-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.chart-card h3 {
    margin-bottom: 20px;
    color: var(--text-primary);
    font-size: 1.3rem;
}

.links-container {
    background: var(--bg-card);
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.links-header {
    background: var(--accent-gradient);
    color: white;
    padding: 20px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

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

.links-table th,
.links-table td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.links-table th {
    background: var(--bg-secondary);
    font-weight: 600;
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.links-table tbody tr {
    background: var(--bg-card);
    transition: all 0.3s ease;
}

.links-table tbody tr:hover {
    background: var(--bg-hover);
}

.short-code {
    font-family: 'Courier New', monospace;
    background: var(--bg-tertiary);
    color: var(--accent-secondary);
    padding: 8px 12px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.9rem;
}

.full-url {
    color: var(--accent-secondary);
    font-weight: 500;
    word-break: break-all;
    max-width: 300px;
}

.clicks-badge {
    background: var(--accent-gradient);
    color: white;
    padding: 4px 10px;
    border-radius: 12px;
    font-size: 0.8rem;
    font-weight: 600;
}

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

.country-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}

.country-item:last-child {
    border-bottom: none;
}

.form-container {
    background: var(--bg-card);
    padding: 40px;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
    max-width: 800px;
}

.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1.1rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 15px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    transition: all 0.3s ease;
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.2);
}

.destinations-container {
    border: 2px solid var(--border-color);
    border-radius: 10px;
    padding: 20px;
    background: var(--bg-secondary);
}

.destination-item {
    display: flex;
    gap: 10px;
    align-items: center;
    margin-bottom: 15px;
    padding: 15px;
    background: var(--bg-card);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    flex-wrap: wrap;
}

.country-selector-btn {
    width: 100%;
    padding: 15px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: all 0.3s ease;
    color: var(--text-primary);
}

.country-selector-btn:hover {
    border-color: var(--accent-primary);
    background: var(--bg-hover);
}

.country-dropdown {
    display: none;
    position: absolute;
    background: var(--bg-card);
    border: 2px solid var(--accent-primary);
    border-radius: 10px;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    max-height: 400px;
    overflow-y: auto;
    width: 100%;
    margin-top: 5px;
}

.country-dropdown.active {
    display: block;
}

.country-checkbox {
    display: flex;
    align-items: center;
    padding: 10px 15px;
    background: var(--bg-secondary);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
}

.country-checkbox:hover {
    border-color: var(--accent-primary);
    background: var(--bg-hover);
    transform: translateY(-2px);
}

.action-btn {
    padding: 6px 12px;
    border: none;
    border-radius: 5px;
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

.btn-copy {
    background: var(--success);
    color: white;
}

.btn-delete {
    background: var(--error);
    color: white;
}

.action-btn:hover {
    transform: translateY(-1px);
    opacity: 0.9;
}

.create-btn {
    background: var(--accent-gradient);
    color: white;
    padding: 12px 25px;
    border: none;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
    font-size: 1rem;
}

.create-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.4);
}

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 30px;
    flex-wrap: wrap;
}

.pagination a,
.pagination span {
    padding: 10px 15px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
}

.pagination a {
    background: var(--bg-card);
    color: var(--accent-secondary);
    border: 2px solid var(--border-color);
}

.pagination a:hover {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.pagination .current {
    background: var(--accent-gradient);
    color: white;
    border: 2px solid transparent;
}

.pagination .disabled {
    background: var(--bg-secondary);
    color: var(--text-muted);
    border: 2px solid var(--border-color);
    cursor: not-allowed;
}

.alert {
    padding: 15px;
    border-radius: 10px;
    margin-bottom: 25px;
    font-weight: 600;
}

.alert.success {
    background: var(--success-bg);
    color: var(--success);
    border: 1px solid var(--success-border);
}

.alert.error {
    background: var(--error-bg);
    color: var(--error);
    border: 1px solid var(--error-border);
}

.alert.warning {
    background: var(--warning-bg);
    color: var(--warning);
    border: 1px solid var(--warning-border);
}

.alert.info {
    background: var(--info-bg);
    color: var(--info);
    border: 1px solid var(--info-border);
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
}

.empty-state .icon {
    font-size: 4rem;
    margin-bottom: 20px;
    opacity: 0.5;
}

.empty-state h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.empty-state p {
    color: var(--text-muted);
    margin-bottom: 30px;
}

.settings-card {
    background: var(--bg-card);
    padding: 30px;
    border-radius: 15px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.settings-card h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--text-primary);
}

.info-box {
    background: var(--info-bg);
    border: 1px solid var(--info-border);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
    color: var(--text-secondary);
}

.quantity-info {
    background: var(--info-bg);
    border: 1px solid var(--info-border);
    padding: 15px;
    border-radius: 8px;
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.created-urls {
    background: var(--success-bg);
    border: 1px solid var(--success-border);
    padding: 20px;
    border-radius: 10px;
    margin-top: 20px;
}

.created-urls h3 {
    color: var(--success);
    margin-bottom: 15px;
}

.url-list {
    list-style: none;
}

.url-list li {
    background: var(--bg-card);
    padding: 10px 15px;
    margin-bottom: 8px;
    border-radius: 5px;
    font-family: 'Courier New', monospace;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.active {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 20px;
        padding-top: 80px;
    }
}