/* Olimpos Tahsilat - Modern UI & Design Tokens */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

:root {
    --primary-color: #0f172a;
    --secondary-color: #2563eb;
    --bg-main: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --shadow-soft: 0 10px 25px -5px rgba(0, 0, 0, 0.05), 0 8px 10px -6px rgba(0, 0, 0, 0.01);
}

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
}

/* Header & Navbar */
.brand-header {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.brand-logo-text {
    font-weight: 800;
    font-size: 1.35rem;
    letter-spacing: -0.5px;
    color: var(--primary-color);
}

/* Credit Card Input Styling */
.card-preview {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    border-radius: var(--radius-lg);
    color: #ffffff;
    padding: 24px;
    box-shadow: 0 15px 30px rgba(15, 23, 42, 0.2);
    margin-bottom: 24px;
    position: relative;
    overflow: hidden;
}

.card-chip {
    width: 48px;
    height: 34px;
    background: linear-gradient(135deg, #fcd34d 0%, #f59e0b 100%);
    border-radius: 6px;
    margin-bottom: 20px;
}

.card-number-display {
    font-size: 1.25rem;
    letter-spacing: 3px;
    font-family: monospace;
    margin-bottom: 16px;
}

.card-holder-display {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    opacity: 0.9;
}

/* Custom UI Elements */
.card-custom {
    background: var(--card-bg);
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-soft);
}

.form-control:focus, .form-select:focus {
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.btn-primary-custom {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
    color: #ffffff;
    font-weight: 600;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    transition: all 0.2s ease;
}

.btn-primary-custom:hover {
    filter: brightness(0.9);
    transform: translateY(-1px);
}

/* Installment Table Badge */
.installment-option {
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px;
    cursor: pointer;
    transition: all 0.2s;
}

.installment-option:hover, .installment-option.selected {
    border-color: var(--secondary-color);
    background-color: rgba(37, 99, 235, 0.04);
}

/* Sidebar for Admin */
.admin-sidebar {
    background: var(--primary-color);
    color: #ffffff;
    min-height: 100vh;
    padding: 20px;
}

.admin-sidebar .nav-link {
    color: #94a3b8;
    font-weight: 500;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 4px;
}

.admin-sidebar .nav-link.active, .admin-sidebar .nav-link:hover {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.1);
}