:root {
    --primary: #4F46E5;
    --primary-hover: #4338CA;
    --bg: #F3F4F6;
    --surface: #FFFFFF;
    --text: #1F2937;
    --text-muted: #6B7280;
    --border: #E5E7EB;
    --error: #EF4444;
    --success: #10B981;
}

[data-theme="dark"] {
    --primary: #6366F1;
    --primary-hover: #818CF8;
    --bg: #111827;
    --surface: #1F2937;
    --text: #F9FAFB;
    --text-muted: #9CA3AF;
    --border: #374151;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--surface);
    padding: 1rem 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.nav-brand {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--primary);
    letter-spacing: 1px;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 1.5rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-muted);
    font-weight: 600;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Buttons */
.btn, .btn-outline {
    display: inline-block;
    padding: 0.5rem 1rem;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

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

.btn:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
}

.btn-outline {
    border: 1px solid var(--border);
    background: transparent;
    color: var(--text);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-text {
    color: var(--text);
    text-decoration: none;
    font-weight: 600;
}

.icon-btn {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
}

.lang-switch a {
    color: var(--text-muted);
    text-decoration: none;
}
.lang-switch a.active {
    color: var(--primary);
    font-weight: bold;
}

/* Cards & Forms */
.card {
    background: var(--surface);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg);
    color: var(--text);
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.alert {
    padding: 1rem;
    border-radius: 6px;
    margin-bottom: 1rem;
}
.alert-error { background: #FEE2E2; color: #991B1B; }
.alert-success { background: #D1FAE5; color: #065F46; }

[data-theme="dark"] .alert-error { background: #7F1D1D; color: #FEE2E2; }
[data-theme="dark"] .alert-success { background: #064E3B; color: #D1FAE5; }

/* Tables */
.table-responsive {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
th {
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    font-size: 0.85rem;
}