/**
 * Certificate Master - Blue Theme CSS
 * Color palette based on Material Design Blue
 */

/* ========================================
   CSS Variables - Blue Color Palette
   ======================================== */
:root {
    /* Blue Gradient Scale */
    --blue-50: #e3f2fd;   /* Alice Blue - Light backgrounds */
    --blue-100: #bbdefb;  /* Icy Blue - Secondary backgrounds */
    --blue-200: #90caf9;  /* Sky Blue - Icons, badges */
    --blue-300: #64b5f6;  /* Cool Sky - Interactive elements */
    --blue-400: #42a5f5;  /* Cool Sky 2 - Secondary buttons */
    --blue-500: #2196f3;  /* Dodger Blue - Primary */
    --blue-600: #1e88e5;  /* Brilliant Azure - Active states */
    --blue-700: #1976d2;  /* Cornflower Ocean - Headers */
    --blue-800: #1565c0;  /* Ocean Deep - Sidebar */
    --blue-900: #0d47a1;  /* Cobalt Blue - Footer */

    /* Semantic Colors */
    --primary: var(--blue-500);
    --primary-hover: var(--blue-600);
    --primary-active: var(--blue-700);
    --primary-dark: var(--blue-800);
    --primary-darker: var(--blue-900);
    --primary-light: var(--blue-100);
    --primary-lighter: var(--blue-50);

    /* Background Gradients */
    --bg-gradient: linear-gradient(135deg, var(--blue-500) 0%, var(--blue-700) 100%);
    --bg-gradient-dark: linear-gradient(135deg, var(--blue-700) 0%, var(--blue-900) 100%);
    --bg-gradient-light: linear-gradient(135deg, var(--blue-50) 0%, var(--blue-100) 100%);

    /* Text Colors */
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #adb5bd;
    --text-white: #ffffff;
    --text-on-primary: #ffffff;

    /* Status Colors */
    --success: #28a745;
    --success-light: #d4edda;
    --danger: #dc3545;
    --danger-light: #f8d7da;
    --warning: #ffc107;
    --warning-light: #fff3cd;
    --info: var(--blue-400);
    --info-light: var(--blue-50);

    /* Shadows */
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 1rem 3rem rgba(0, 0, 0, 0.175);
    --shadow-primary: 0 0.5rem 1rem rgba(33, 150, 243, 0.3);

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius: 0.5rem;
    --radius-lg: 1rem;
    --radius-pill: 50rem;

    /* Transitions */
    --transition: all 0.3s ease;
    --transition-fast: all 0.15s ease;
}

/* ========================================
   Base Styles
   ======================================== */
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    color: var(--text-primary);
}

main {
    flex: 1;
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

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

/* ========================================
   Hero Section
   ======================================== */
.hero-section {
    background: var(--bg-gradient);
    color: var(--text-white);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    pointer-events: none;
}

.hero-section h1,
.hero-section p {
    position: relative;
    z-index: 1;
}

/* ========================================
   Cards
   ======================================== */
.card {
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card-hover:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.card-primary {
    background: var(--bg-gradient);
    color: var(--text-white);
}

.card-header {
    background: var(--primary-lighter);
    border-bottom: 1px solid var(--blue-100);
    font-weight: 600;
}

/* ========================================
   Buttons
   ======================================== */
.btn-primary {
    background: var(--primary);
    border-color: var(--primary);
    box-shadow: var(--shadow-primary);
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--primary-hover);
    border-color: var(--primary-hover);
    box-shadow: 0 0.5rem 1.5rem rgba(33, 150, 243, 0.4);
}

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

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

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

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

.btn-light:hover {
    background: var(--primary-lighter);
    border-color: var(--primary-lighter);
    color: var(--primary-dark);
}

/* ========================================
   Forms
   ======================================== */
.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 0.25rem rgba(33, 150, 243, 0.25);
}

.form-label {
    font-weight: 500;
    color: var(--text-primary);
}

.input-group-text {
    background: var(--primary-lighter);
    border-color: var(--blue-200);
    color: var(--primary);
}

/* ========================================
   Navigation
   ======================================== */
.navbar {
    background: var(--bg-gradient-dark);
    box-shadow: var(--shadow);
}

.navbar-brand {
    font-weight: 700;
    color: var(--text-white) !important;
}

.nav-link {
    color: rgba(255, 255, 255, 0.85) !important;
    font-weight: 500;
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--text-white) !important;
}

.nav-link.active {
    color: var(--text-white) !important;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-sm);
}

/* ========================================
   Sidebar
   ======================================== */
.sidebar {
    background: var(--primary-dark);
    min-height: calc(100vh - 56px);
    color: var(--text-white);
}

.sidebar .nav-link {
    color: rgba(255, 255, 255, 0.7) !important;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    margin: 0.125rem 0.5rem;
}

.sidebar .nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-white) !important;
}

.sidebar .nav-link.active {
    background: var(--primary);
    color: var(--text-white) !important;
}

.sidebar .nav-link i {
    width: 1.5rem;
    margin-right: 0.5rem;
}

/* ========================================
   Footer
   ======================================== */
.footer {
    background: var(--primary-darker);
    color: rgba(255, 255, 255, 0.7);
    padding: 1.5rem 0;
}

.footer a {
    color: rgba(255, 255, 255, 0.85);
}

.footer a:hover {
    color: var(--text-white);
}

/* ========================================
   Tables
   ======================================== */
.table {
    --bs-table-bg: transparent;
}

.table thead th {
    background: var(--primary-lighter);
    border-bottom: 2px solid var(--blue-200);
    color: var(--primary-dark);
    font-weight: 600;
}

.table-hover tbody tr:hover {
    background-color: var(--primary-lighter);
}

/* ========================================
   Badges
   ======================================== */
.badge-primary {
    background: var(--primary);
}

.badge-success {
    background: var(--success);
}

.badge-danger {
    background: var(--danger);
}

.badge-warning {
    background: var(--warning);
    color: var(--text-primary);
}

.badge-info {
    background: var(--info);
}

/* ========================================
   Alerts
   ======================================== */
.alert-primary {
    background: var(--primary-lighter);
    border-color: var(--blue-200);
    color: var(--primary-dark);
}

.alert-success {
    background: var(--success-light);
    border-color: #c3e6cb;
    color: #155724;
}

.alert-danger {
    background: var(--danger-light);
    border-color: #f5c6cb;
    color: #721c24;
}

.alert-warning {
    background: var(--warning-light);
    border-color: #ffeeba;
    color: #856404;
}

/* ========================================
   Progress Bars
   ======================================== */
.progress {
    background: var(--primary-lighter);
    border-radius: var(--radius-pill);
}

.progress-bar {
    background: var(--bg-gradient);
}

/* ========================================
   Stats Cards
   ======================================== */
.stat-card {
    background: var(--text-white);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.stat-card:hover {
    box-shadow: var(--shadow);
}

.stat-card .stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-card .stat-icon.primary {
    background: var(--primary-lighter);
    color: var(--primary);
}

.stat-card .stat-icon.success {
    background: var(--success-light);
    color: var(--success);
}

.stat-card .stat-icon.warning {
    background: var(--warning-light);
    color: var(--warning);
}

.stat-card .stat-icon.info {
    background: var(--info-light);
    color: var(--info);
}

.stat-card .stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.stat-card .stat-label {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* ========================================
   Language Switcher
   ======================================== */
.lang-switcher {
    position: relative;
}

.lang-switcher .dropdown-toggle {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-sm);
}

.lang-switcher .dropdown-toggle:hover {
    background: rgba(255, 255, 255, 0.2);
}

.lang-switcher .dropdown-menu {
    min-width: 120px;
}

.lang-switcher .dropdown-item {
    padding: 0.5rem 1rem;
}

.lang-switcher .dropdown-item.active {
    background: var(--primary-lighter);
    color: var(--primary);
}

/* ========================================
   Login Page
   ======================================== */
.login-page {
    min-height: 100vh;
    background: var(--bg-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-card {
    background: var(--text-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    max-width: 400px;
    width: 100%;
    padding: 2rem;
}

.login-card .login-logo {
    text-align: center;
    margin-bottom: 1.5rem;
}

.login-card .login-logo i {
    font-size: 3rem;
    color: var(--primary);
}

.login-card h1 {
    font-size: 1.5rem;
    text-align: center;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.login-card .login-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

/* ========================================
   Certificate Download Page
   ======================================== */
.certificate-page {
    min-height: 100vh;
    background: var(--bg-gradient-light);
}

.certificate-card {
    background: var(--text-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
    max-width: 500px;
    width: 100%;
    padding: 2rem;
}

.certificate-card .event-logo {
    text-align: center;
    margin-bottom: 1.5rem;
}

.certificate-card .event-logo i {
    font-size: 4rem;
    color: var(--primary);
}

/* ========================================
   Utilities
   ======================================== */
.bg-primary-gradient {
    background: var(--bg-gradient);
}

.bg-primary-light {
    background: var(--primary-lighter);
}

.text-primary {
    color: var(--primary) !important;
}

.text-primary-dark {
    color: var(--primary-dark) !important;
}

.border-primary {
    border-color: var(--primary) !important;
}

.rounded-lg {
    border-radius: var(--radius-lg) !important;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
    .hero-section {
        padding: 60px 0;
    }

    .hero-section h1 {
        font-size: 2rem;
    }

    .stat-card {
        margin-bottom: 1rem;
    }

    .sidebar {
        min-height: auto;
    }
}