/**
 * GeLa Sprachschule - Stylesheet
 */

/* ============================================================================
   CSS Variables
   ============================================================================ */

:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1d4ed8;
    --color-primary-light: #3b82f6;
    --color-secondary: #64748b;
    --color-success: #22c55e;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-info: #3b82f6;

    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    /* Spacing */
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-xl: 0.75rem;
    --radius-2xl: 1rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;

    /* Layout */
    --container-max: 1200px;
    --header-height: 72px;
}

/* ============================================================================
   Reset & Base
   ============================================================================ */

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-gray-50);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

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

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

img {
    max-width: 100%;
    height: auto;
}

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-gray-900);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

/* ============================================================================
   Layout
   ============================================================================ */

.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-4);
}

.main-content {
    flex: 1;
    padding-top: var(--spacing-8);
    padding-bottom: var(--spacing-16);
}

/* ============================================================================
   Header & Navigation
   ============================================================================ */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    height: var(--header-height);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-gray-900);
}

.logo:hover {
    color: var(--color-primary);
}

.logo-icon {
    font-size: 1.5em;
}

.main-nav {
    display: none;
}

@media (min-width: 768px) {
    .main-nav {
        display: block;
    }
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-6);
}

.nav-list a {
    color: var(--color-gray-600);
    font-weight: 500;
    padding: var(--spacing-2) 0;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
}

.nav-list a:hover,
.nav-list a.active {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
}

.nav-admin {
    color: var(--color-warning) !important;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--spacing-4);
}

/* Language Switcher */
.lang-switcher {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
}

.lang-link {
    color: var(--color-gray-500);
    font-weight: 500;
    padding: var(--spacing-1) var(--spacing-2);
    border-radius: var(--radius-sm);
}

.lang-link:hover,
.lang-link.active {
    color: var(--color-primary);
    background: var(--color-primary);
    background: rgba(37, 99, 235, 0.1);
}

.lang-separator {
    color: var(--color-gray-300);
}

/* User Menu */
.user-menu {
    position: relative;
}

.user-menu-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    background: none;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-full);
    padding: var(--spacing-1) var(--spacing-3) var(--spacing-1) var(--spacing-1);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.user-menu-toggle:hover {
    border-color: var(--color-gray-300);
    background: var(--color-gray-50);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--color-primary);
    color: var(--color-white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--font-size-sm);
}

.user-name {
    font-weight: 500;
    color: var(--color-gray-700);
}

.user-dropdown {
    position: absolute;
    top: calc(100% + var(--spacing-2));
    right: 0;
    min-width: 180px;
    background: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-2);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
}

.user-menu:hover .user-dropdown,
.user-menu.active .user-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.user-dropdown a {
    display: block;
    padding: var(--spacing-2) var(--spacing-3);
    color: var(--color-gray-700);
    border-radius: var(--radius-md);
}

.user-dropdown a:hover {
    background: var(--color-gray-100);
    color: var(--color-primary);
}

.user-dropdown hr {
    border: none;
    border-top: 1px solid var(--color-gray-200);
    margin: var(--spacing-2) 0;
}

/* Mobile Menu */
.mobile-menu-toggle {
    display: flex;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    padding: var(--spacing-2);
    cursor: pointer;
}

@media (min-width: 768px) {
    .mobile-menu-toggle {
        display: none;
    }
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-gray-700);
    transition: all var(--transition-fast);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    padding: var(--spacing-4);
    z-index: 99;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav-list {
    list-style: none;
}

.mobile-nav-list a {
    display: block;
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--color-gray-700);
    border-radius: var(--radius-md);
}

.mobile-nav-list a:hover {
    background: var(--color-gray-100);
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-2);
    padding: var(--spacing-2) var(--spacing-4);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

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

.btn-secondary {
    background: var(--color-gray-600);
    color: var(--color-white);
}

.btn-secondary:hover {
    background: var(--color-gray-700);
    color: var(--color-white);
}

.btn-outline {
    border-color: var(--color-gray-300);
    color: var(--color-gray-700);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--color-gray-400);
    background: var(--color-gray-50);
    color: var(--color-gray-900);
}

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

.btn-success:hover {
    background: #16a34a;
    color: var(--color-white);
}

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

.btn-danger:hover {
    background: #dc2626;
    color: var(--color-white);
}

.btn-lg {
    padding: var(--spacing-3) var(--spacing-6);
    font-size: var(--font-size-base);
}

.btn-sm {
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-xs);
}

.btn-block {
    width: 100%;
}

/* ============================================================================
   Forms
   ============================================================================ */

.form-group {
    margin-bottom: var(--spacing-4);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-2);
    font-weight: 500;
    color: var(--color-gray-700);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: var(--spacing-3) var(--spacing-4);
    font-size: var(--font-size-base);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    background: var(--color-white);
    transition: all var(--transition-fast);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
    border-color: var(--color-error);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
}

.form-checkbox input {
    width: 18px;
    height: 18px;
    accent-color: var(--color-primary);
}

.form-hint {
    margin-top: var(--spacing-1);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.form-error {
    margin-top: var(--spacing-1);
    font-size: var(--font-size-sm);
    color: var(--color-error);
}

.form-row {
    display: grid;
    gap: var(--spacing-4);
}

@media (min-width: 640px) {
    .form-row {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ============================================================================
   Cards
   ============================================================================ */

.card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-gray-200);
    overflow: hidden;
}

.card-header {
    padding: var(--spacing-4) var(--spacing-6);
    border-bottom: 1px solid var(--color-gray-200);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
}

.card-body {
    padding: var(--spacing-6);
}

.card-footer {
    padding: var(--spacing-4) var(--spacing-6);
    border-top: 1px solid var(--color-gray-200);
    background: var(--color-gray-50);
}

/* ============================================================================
   Course Cards
   ============================================================================ */

.courses-grid {
    display: grid;
    gap: var(--spacing-6);
}

@media (min-width: 640px) {
    .courses-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .courses-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.course-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: all var(--transition-base);
    position: relative;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.course-card-image {
    position: relative;
    height: 160px;
    overflow: hidden;
}

.course-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.course-card:hover .course-card-image img {
    transform: scale(1.05);
}

.course-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-4);
    background: var(--color-gray-50);
}

.course-level {
    padding: var(--spacing-1) var(--spacing-3);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
}

.niveau-a1, .niveau-a2 {
    background: #dcfce7;
    color: #166534;
}

.niveau-b1, .niveau-b2 {
    background: #fef3c7;
    color: #92400e;
}

.niveau-c1, .niveau-c2 {
    background: #fecaca;
    color: #991b1b;
}

.course-language {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.course-card-title {
    padding: var(--spacing-4);
    font-size: var(--font-size-lg);
    line-height: 1.4;
}

.course-card-description {
    padding: 0 var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    line-height: 1.6;
}

.course-card-info {
    padding: var(--spacing-4);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.info-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.info-icon {
    width: 20px;
    text-align: center;
}

.course-card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-4);
    border-top: 1px solid var(--color-gray-100);
}

.course-spots {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-1);
}

.spots-count {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-success);
}

.spots-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.course-spots.few-spots .spots-count {
    color: var(--color-warning);
}

.course-spots.no-spots .spots-label {
    color: var(--color-error);
    font-weight: 500;
}

.course-price {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-gray-900);
}

.course-card-link {
    display: block;
    padding: var(--spacing-4);
    text-align: center;
    background: var(--color-primary);
    color: var(--color-white);
    font-weight: 500;
    transition: background var(--transition-fast);
}

.course-card-link:hover {
    background: var(--color-primary-dark);
    color: var(--color-white);
}

/* ============================================================================
   Course Detail Page
   ============================================================================ */

/* Course Detail Hero */
.course-detail-hero {
    position: relative;
    height: 300px;
    overflow: hidden;
    margin-bottom: var(--spacing-8);
}

.course-detail-hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.course-detail-hero-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-8) 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.7));
    color: var(--color-white);
}

.course-detail-hero-overlay h1 {
    color: var(--color-white);
    font-size: var(--font-size-3xl);
    margin-top: var(--spacing-3);
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

.course-detail-hero-overlay .course-level {
    display: inline-block;
}

@media (max-width: 640px) {
    .course-detail-hero {
        height: 200px;
        margin-bottom: var(--spacing-4);
    }

    .course-detail-hero-overlay {
        padding: var(--spacing-4) 0;
    }

    .course-detail-hero-overlay h1 {
        font-size: var(--font-size-xl);
    }
}

.course-detail {
    max-width: 900px;
    margin: 0 auto;
}

.course-detail-header {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-3);
    margin-bottom: var(--spacing-6);
}

.course-detail-title {
    width: 100%;
    margin-bottom: var(--spacing-2);
}

.course-meta {
    display: grid;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-6);
}

@media (min-width: 640px) {
    .course-meta {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .course-meta {
        grid-template-columns: repeat(4, 1fr);
    }
}

.meta-item {
    padding: var(--spacing-4);
    background: var(--color-gray-50);
    border-radius: var(--radius-lg);
}

.meta-label {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-1);
}

.meta-value {
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-gray-900);
}

.course-description {
    margin-bottom: var(--spacing-8);
    line-height: 1.8;
}

.course-schedule {
    margin-bottom: var(--spacing-8);
}

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

.schedule-table th,
.schedule-table td {
    padding: var(--spacing-3) var(--spacing-4);
    text-align: left;
    border-bottom: 1px solid var(--color-gray-200);
}

.schedule-table th {
    font-weight: 500;
    color: var(--color-gray-500);
    font-size: var(--font-size-sm);
    text-transform: uppercase;
}

.course-registration-box {
    background: var(--color-white);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    text-align: center;
}

.registration-spots {
    margin-bottom: var(--spacing-4);
}

.registration-price {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-4);
}

/* ============================================================================
   Page Header
   ============================================================================ */

.page-header {
    padding: var(--spacing-8) 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-200);
    margin-bottom: var(--spacing-8);
}

.back-link {
    display: inline-block;
    margin-bottom: var(--spacing-4);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

.back-link:hover {
    color: var(--color-primary);
}

.page-title {
    margin-bottom: var(--spacing-2);
}

.page-subtitle {
    color: var(--color-gray-600);
    font-size: var(--font-size-lg);
}

/* ============================================================================
   Breadcrumb
   ============================================================================ */

.breadcrumb {
    padding: var(--spacing-4) 0;
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-100);
}

.breadcrumb-list {
    display: flex;
    flex-wrap: wrap;
    list-style: none;
    font-size: var(--font-size-sm);
}

.breadcrumb-list li {
    display: flex;
    align-items: center;
}

.breadcrumb-list li:not(:last-child)::after {
    content: '/';
    margin: 0 var(--spacing-2);
    color: var(--color-gray-400);
}

.breadcrumb-list a {
    color: var(--color-gray-500);
}

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

.breadcrumb-list span[aria-current] {
    color: var(--color-gray-900);
}

/* ============================================================================
   Flash Messages
   ============================================================================ */

.flash-message {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-4);
    margin-bottom: var(--spacing-4);
    border-radius: var(--radius-lg);
    max-width: var(--container-max);
    margin-left: auto;
    margin-right: auto;
}

.flash-success {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #86efac;
}

.flash-error {
    background: #fef2f2;
    color: #991b1b;
    border: 1px solid #fecaca;
}

.flash-warning {
    background: #fffbeb;
    color: #92400e;
    border: 1px solid #fde68a;
}

.flash-info {
    background: #eff6ff;
    color: #1e40af;
    border: 1px solid #bfdbfe;
}

.flash-icon {
    font-weight: bold;
}

.flash-text {
    flex: 1;
}

.flash-close {
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.flash-close:hover {
    opacity: 1;
}

/* ============================================================================
   Auth Forms
   ============================================================================ */

.auth-container {
    max-width: 440px;
    margin: 0 auto;
    padding: var(--spacing-4);
}

.auth-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-8);
}

.auth-header {
    text-align: center;
    margin-bottom: var(--spacing-8);
}

.auth-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-2);
}

.auth-subtitle {
    color: var(--color-gray-500);
}

.auth-footer {
    text-align: center;
    margin-top: var(--spacing-6);
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--color-gray-200);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.auth-footer a {
    font-weight: 500;
}

/* ============================================================================
   Dashboard
   ============================================================================ */

.dashboard-header {
    margin-bottom: var(--spacing-8);
}

.dashboard-welcome {
    font-size: var(--font-size-2xl);
    font-weight: 600;
}

.dashboard-stats {
    display: grid;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-8);
}

@media (min-width: 640px) {
    .dashboard-stats {
        grid-template-columns: repeat(3, 1fr);
    }
}

.stat-card {
    background: var(--color-white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-6);
    text-align: center;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-gray-200);
}

.stat-value {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-primary);
}

.stat-label {
    color: var(--color-gray-600);
    margin-top: var(--spacing-2);
}

/* ============================================================================
   Tables
   ============================================================================ */

.table-container {
    overflow-x: auto;
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-gray-200);
}

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

.data-table th,
.data-table td {
    padding: var(--spacing-4);
    text-align: left;
    border-bottom: 1px solid var(--color-gray-200);
}

.data-table th {
    background: var(--color-gray-50);
    font-weight: 600;
    font-size: var(--font-size-sm);
    text-transform: uppercase;
    color: var(--color-gray-600);
}

.data-table tr:last-child td {
    border-bottom: none;
}

.data-table tr:hover td {
    background: var(--color-gray-50);
}

.table-actions {
    display: flex;
    gap: var(--spacing-2);
}

/* ============================================================================
   Filter Bar
   ============================================================================ */

.filter-bar {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-4);
    margin-bottom: var(--spacing-6);
    padding: var(--spacing-4);
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
}

.filter-group {
    flex: 1;
    min-width: 150px;
}

.filter-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-1);
}

.filter-group select,
.filter-group input {
    width: 100%;
    padding: var(--spacing-2) var(--spacing-3);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
}

/* ============================================================================
   Empty States
   ============================================================================ */

.empty-state {
    text-align: center;
    padding: var(--spacing-16) var(--spacing-8);
}

.empty-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-4);
}

.empty-title {
    font-size: var(--font-size-xl);
    color: var(--color-gray-900);
    margin-bottom: var(--spacing-2);
}

.empty-text {
    color: var(--color-gray-500);
    margin-bottom: var(--spacing-6);
}

/* ============================================================================
   Pagination
   ============================================================================ */

.pagination {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2);
    margin-top: var(--spacing-8);
}

.pagination-link {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 40px;
    height: 40px;
    padding: 0 var(--spacing-3);
    background: var(--color-white);
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-weight: 500;
    color: var(--color-gray-700);
    transition: all var(--transition-fast);
}

.pagination-link:hover {
    background: var(--color-gray-50);
    border-color: var(--color-gray-400);
    color: var(--color-gray-900);
}

.pagination-link.current {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: var(--color-white);
}

/* ============================================================================
   Footer
   ============================================================================ */

.site-footer {
    background: var(--color-gray-900);
    color: var(--color-gray-300);
    padding: var(--spacing-12) 0 var(--spacing-6);
    margin-top: auto;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: var(--spacing-8);
    margin-bottom: var(--spacing-8);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2);
}

.footer-brand span {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--color-white);
}

.footer-brand .tagline {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-6);
}

.footer-links a {
    color: var(--color-gray-400);
    font-size: var(--font-size-sm);
}

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

.footer-bottom {
    padding-top: var(--spacing-6);
    border-top: 1px solid var(--color-gray-800);
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
}

/* ============================================================================
   Admin Specific
   ============================================================================ */

.admin-layout {
    display: flex;
    min-height: calc(100vh - var(--header-height));
}

.admin-sidebar {
    width: 250px;
    background: var(--color-white);
    border-right: 1px solid var(--color-gray-200);
    padding: var(--spacing-6);
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .admin-sidebar {
        display: none;
    }
}

.admin-nav {
    list-style: none;
}

.admin-nav a {
    display: flex;
    align-items: center;
    gap: var(--spacing-3);
    padding: var(--spacing-3) var(--spacing-4);
    color: var(--color-gray-600);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-1);
}

.admin-nav a:hover,
.admin-nav a.active {
    background: var(--color-gray-100);
    color: var(--color-primary);
}

.admin-content {
    flex: 1;
    padding: var(--spacing-8);
    overflow-x: auto;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-6);
}

/* ============================================================================
   Utilities
   ============================================================================ */

.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.text-success { color: var(--color-success); }
.text-warning { color: var(--color-warning); }
.text-error { color: var(--color-error); }
.text-muted { color: var(--color-gray-500); }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--spacing-4); }
.mb-8 { margin-bottom: var(--spacing-8); }
.mt-4 { margin-top: var(--spacing-4); }
.mt-8 { margin-top: var(--spacing-8); }

.hidden { display: none !important; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Status badges */
.badge {
    display: inline-block;
    padding: var(--spacing-1) var(--spacing-2);
    font-size: var(--font-size-xs);
    font-weight: 500;
    border-radius: var(--radius-full);
}

.badge-success {
    background: #dcfce7;
    color: #166534;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.badge-error {
    background: #fef2f2;
    color: #991b1b;
}

.badge-info {
    background: #eff6ff;
    color: #1e40af;
}

/* ============================================================================
   Decorative Side Images (Desktop Only)
   ============================================================================ */

@media (min-width: 1400px) {
    body {
        position: relative;
    }

    body::before,
    body::after {
        content: '';
        position: fixed;
        top: var(--header-height);
        width: 200px;
        height: calc(100vh - var(--header-height));
        background-size: cover;
        background-position: center;
        background-repeat: no-repeat;
        opacity: 0.15;
        pointer-events: none;
        z-index: -1;
    }

    body::before {
        left: 0;
        background-image: url('https://images.unsplash.com/photo-1522202176988-66273c2fd55f?w=400&h=800&fit=crop');
    }

    body::after {
        right: 0;
        background-image: url('https://images.unsplash.com/photo-1523240795612-9a054b0db644?w=400&h=800&fit=crop');
    }
}

/* Hero Section with Background */
.page-header {
    position: relative;
    overflow: hidden;
}

.page-header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('https://images.unsplash.com/photo-1524178232363-1fb2b075b655?w=1920&h=400&fit=crop');
    background-size: cover;
    background-position: center;
    opacity: 0.08;
    z-index: -1;
}

/* Course Overview Hero Banner */
.hero-banner {
    position: relative;
    padding: var(--spacing-12) 0;
    margin-bottom: var(--spacing-8);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    overflow: hidden;
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('https://images.unsplash.com/photo-1571260899304-425eee4c7efc?w=1920&h=600&fit=crop');
    background-size: cover;
    background-position: center;
    opacity: 0.2;
}

.hero-content {
    position: relative;
    z-index: 1;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-8);
}

.hero-text {
    flex: 1;
}

.hero-title {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    margin-bottom: var(--spacing-4);
}

.hero-title-small {
    font-size: var(--font-size-xl);
    font-weight: 500;
    color: var(--color-white);
    opacity: 0.9;
}

.hero-title-large {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.2;
}

.hero-banner p {
    font-size: var(--font-size-xl);
    opacity: 0.9;
    max-width: 600px;
}

.hero-image {
    flex-shrink: 0;
}

.owners-photo-large {
    width: 180px;
    height: 180px;
    border-radius: var(--radius-full);
    object-fit: cover;
    border: 4px solid var(--color-white);
    box-shadow: var(--shadow-xl);
}

@media (max-width: 768px) {
    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-title {
        align-items: center;
    }

    .hero-image {
        order: -1;
        margin-bottom: var(--spacing-4);
    }

    .owners-photo-large {
        width: 120px;
        height: 120px;
    }

    .hero-banner p {
        margin: 0 auto;
    }
}

@media (max-width: 640px) {
    .hero-banner {
        padding: var(--spacing-8) 0;
    }

    .hero-title-small {
        font-size: var(--font-size-base);
    }

    .hero-title-large {
        font-size: var(--font-size-2xl);
    }

    .hero-banner p {
        font-size: var(--font-size-base);
    }

    .owners-photo-large {
        width: 100px;
        height: 100px;
    }
}

/* Image Cards for Features */
.feature-section {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-6);
    margin: var(--spacing-12) 0;
}

@media (max-width: 768px) {
    .feature-section {
        grid-template-columns: 1fr;
    }
}

.feature-card {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    aspect-ratio: 4/3;
    box-shadow: var(--shadow-lg);
}

.feature-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.feature-card:hover img {
    transform: scale(1.05);
}

.feature-card-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-6);
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    color: var(--color-white);
}

.feature-card-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-2);
    color: var(--color-white);
}

.feature-card-text {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

/* Testimonial Section with Image */
.testimonial-section {
    padding: var(--spacing-16) 0;
    background: var(--color-gray-100);
    margin: var(--spacing-12) 0;
}

.testimonial-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-8);
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-8);
    background: var(--color-white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

.testimonial-image {
    flex-shrink: 0;
    width: 150px;
    height: 150px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.testimonial-content {
    flex: 1;
}

.testimonial-quote {
    font-size: var(--font-size-lg);
    font-style: italic;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-4);
    line-height: 1.8;
}

.testimonial-author {
    font-weight: 600;
    color: var(--color-gray-900);
}

@media (max-width: 768px) {
    .testimonial-card {
        flex-direction: column;
        text-align: center;
        padding: var(--spacing-6);
    }

    .testimonial-image {
        width: 100px;
        height: 100px;
    }
}

/* About Section with Side Image */
.about-section {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-12);
    align-items: center;
    margin: var(--spacing-12) 0;
}

@media (max-width: 768px) {
    .about-section {
        grid-template-columns: 1fr;
        gap: var(--spacing-6);
    }
}

.about-image {
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
}

.about-image img {
    width: 100%;
    height: auto;
    display: block;
}

.about-content h2 {
    margin-bottom: var(--spacing-4);
}

.about-content p {
    color: var(--color-gray-600);
    line-height: 1.8;
    margin-bottom: var(--spacing-4);
}

/* ============================================================================
   Mobile Optimizations
   ============================================================================ */

/* Mobile Typography */
@media (max-width: 640px) {
    html {
        font-size: 14px;
    }

    h1 {
        font-size: var(--font-size-2xl);
        line-height: 1.2;
    }

    h2 {
        font-size: var(--font-size-xl);
    }

    h3 {
        font-size: var(--font-size-lg);
    }

    .page-title {
        font-size: var(--font-size-2xl);
    }

    .page-subtitle {
        font-size: var(--font-size-base);
    }
}

/* Mobile Header */
@media (max-width: 640px) {
    :root {
        --header-height: 60px;
    }

    .logo {
        font-size: var(--font-size-base);
        max-width: 180px;
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    .logo-icon {
        font-size: 1.2em;
    }

    .header-actions {
        gap: var(--spacing-2);
    }

    .header-actions .btn {
        display: none;
    }

    .lang-switcher {
        font-size: var(--font-size-xs);
    }

    .user-menu-toggle {
        padding: var(--spacing-1);
    }

    .user-name {
        display: none;
    }

    .user-avatar {
        width: 28px;
        height: 28px;
        font-size: var(--font-size-xs);
    }
}

/* Mobile Navigation */
@media (max-width: 640px) {
    .mobile-nav {
        padding: var(--spacing-2);
        max-height: calc(100vh - var(--header-height));
        overflow-y: auto;
    }

    .mobile-nav-list a {
        padding: var(--spacing-4);
        font-size: var(--font-size-base);
        border-bottom: 1px solid var(--color-gray-100);
    }

    .mobile-nav-list li:last-child a {
        border-bottom: none;
    }
}

/* Mobile Page Header */
@media (max-width: 640px) {
    .page-header {
        padding: var(--spacing-4) 0;
        margin-bottom: var(--spacing-4);
    }

    .main-content {
        padding-top: var(--spacing-4);
        padding-bottom: var(--spacing-8);
    }
}

/* Mobile Filter Bar */
@media (max-width: 640px) {
    .filter-bar {
        flex-direction: column;
        gap: var(--spacing-3);
        padding: var(--spacing-3);
    }

    .filter-group {
        min-width: 100%;
    }

    .filter-group:last-child {
        display: flex;
        flex-direction: row;
        gap: var(--spacing-2);
    }

    .filter-group:last-child .btn {
        flex: 1;
    }
}

/* Mobile Course Cards */
@media (max-width: 640px) {
    .courses-grid {
        gap: var(--spacing-4);
    }

    .course-card {
        border-radius: var(--radius-lg);
    }

    .course-card:hover {
        transform: none;
    }

    .course-card-image {
        height: 120px;
    }

    .course-card:hover .course-card-image img {
        transform: none;
    }

    .course-card-header {
        padding: var(--spacing-3);
    }

    .course-card-title {
        padding: var(--spacing-3);
        font-size: var(--font-size-base);
    }

    .course-card-description {
        padding: 0 var(--spacing-3);
        font-size: var(--font-size-sm);
    }

    .course-card-info {
        padding: var(--spacing-3);
    }

    .course-card-footer {
        padding: var(--spacing-3);
        flex-direction: column;
        gap: var(--spacing-2);
        align-items: flex-start;
    }

    .course-price {
        font-size: var(--font-size-lg);
    }

    .course-card-link {
        padding: var(--spacing-3);
        font-size: var(--font-size-sm);
    }
}

/* Mobile Course Detail */
@media (max-width: 640px) {
    .course-detail {
        padding: 0 var(--spacing-2);
    }

    .course-detail-header {
        margin-bottom: var(--spacing-4);
    }

    .course-detail-title {
        font-size: var(--font-size-xl);
    }

    .course-meta {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-2);
    }

    .meta-item {
        padding: var(--spacing-3);
    }

    .meta-label {
        font-size: var(--font-size-xs);
    }

    .meta-value {
        font-size: var(--font-size-base);
    }

    .course-registration-box {
        padding: var(--spacing-4);
        border-radius: var(--radius-lg);
    }

    .registration-price {
        font-size: var(--font-size-2xl);
    }

    .schedule-table th,
    .schedule-table td {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: var(--font-size-sm);
    }
}

/* Mobile Cards */
@media (max-width: 640px) {
    .card {
        border-radius: var(--radius-lg);
    }

    .card-header {
        padding: var(--spacing-3) var(--spacing-4);
    }

    .card-body {
        padding: var(--spacing-4);
    }

    .card-footer {
        padding: var(--spacing-3) var(--spacing-4);
    }

    .card-title {
        font-size: var(--font-size-base);
    }
}

/* Mobile Auth Forms */
@media (max-width: 640px) {
    .auth-container {
        padding: var(--spacing-2);
    }

    .auth-card {
        padding: var(--spacing-4);
        border-radius: var(--radius-lg);
    }

    .auth-header {
        margin-bottom: var(--spacing-4);
    }

    .auth-title {
        font-size: var(--font-size-xl);
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}

/* Mobile Buttons - Better Touch Targets */
@media (max-width: 640px) {
    .btn {
        padding: var(--spacing-3) var(--spacing-4);
        min-height: 44px;
        font-size: var(--font-size-base);
    }

    .btn-sm {
        padding: var(--spacing-2) var(--spacing-3);
        min-height: 36px;
        font-size: var(--font-size-sm);
    }

    .btn-lg {
        padding: var(--spacing-4) var(--spacing-6);
        min-height: 52px;
    }
}

/* Mobile Forms - Better Touch Targets */
@media (max-width: 640px) {
    .form-input,
    .form-select,
    .form-textarea {
        padding: var(--spacing-3);
        font-size: 16px; /* Prevents zoom on iOS */
        min-height: 48px;
    }

    .form-checkbox input {
        width: 22px;
        height: 22px;
    }

    .form-label {
        font-size: var(--font-size-sm);
    }
}

/* Mobile Tables */
@media (max-width: 640px) {
    .table-container {
        border-radius: var(--radius-lg);
        margin: 0 calc(-1 * var(--spacing-2));
        width: calc(100% + var(--spacing-4));
    }

    .data-table th,
    .data-table td {
        padding: var(--spacing-2) var(--spacing-3);
        font-size: var(--font-size-sm);
    }

    .data-table th {
        font-size: var(--font-size-xs);
    }

    .table-actions {
        flex-direction: column;
        gap: var(--spacing-1);
    }

    .table-actions .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Mobile Dashboard */
@media (max-width: 640px) {
    .dashboard-stats {
        grid-template-columns: 1fr;
        gap: var(--spacing-3);
    }

    .stat-card {
        padding: var(--spacing-4);
        display: flex;
        align-items: center;
        justify-content: space-between;
        text-align: left;
    }

    .stat-value {
        font-size: var(--font-size-2xl);
        order: 2;
    }

    .stat-label {
        margin-top: 0;
        order: 1;
    }
}

/* Mobile Footer */
@media (max-width: 640px) {
    .site-footer {
        padding: var(--spacing-8) 0 var(--spacing-4);
    }

    .footer-content {
        flex-direction: column;
        gap: var(--spacing-6);
        margin-bottom: var(--spacing-6);
    }

    .footer-brand {
        text-align: center;
    }

    .footer-links {
        justify-content: center;
        gap: var(--spacing-4);
    }

    .footer-bottom {
        text-align: center;
        padding-top: var(--spacing-4);
    }
}

/* Mobile Flash Messages */
@media (max-width: 640px) {
    .flash-message {
        margin: var(--spacing-2);
        padding: var(--spacing-3);
        border-radius: var(--radius-md);
        font-size: var(--font-size-sm);
    }
}

/* Mobile Empty State */
@media (max-width: 640px) {
    .empty-state {
        padding: var(--spacing-8) var(--spacing-4);
    }

    .empty-icon {
        font-size: 3rem;
    }

    .empty-title {
        font-size: var(--font-size-lg);
    }
}

/* Mobile Admin */
@media (max-width: 768px) {
    .admin-layout {
        flex-direction: column;
    }

    .admin-content {
        padding: var(--spacing-4);
    }

    .admin-header {
        flex-direction: column;
        gap: var(--spacing-3);
        align-items: flex-start;
    }

    .admin-header h1 {
        font-size: var(--font-size-xl);
    }
}

/* Mobile Breadcrumb */
@media (max-width: 640px) {
    .breadcrumb {
        padding: var(--spacing-2) 0;
    }

    .breadcrumb-list {
        font-size: var(--font-size-xs);
    }
}

/* Prevent horizontal scroll */
@media (max-width: 640px) {
    body {
        overflow-x: hidden;
    }

    .container {
        padding: 0 var(--spacing-3);
    }
}

/* Touch-friendly spacing */
@media (max-width: 640px) {
    .course-card-link,
    .mobile-nav-list a,
    .user-dropdown a {
        min-height: 44px;
        display: flex;
        align-items: center;
        justify-content: center;
    }
}