/* ======================================
   ระบบลงทะเบียนอบรมอาชีพเสริม ปี 2568
   สหกรณ์ออมทรัพย์สาธารณสุขสกลนคร
   Modern Color Scheme with Eye Comfort
   ====================================== */

/* CSS Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Government Color Palette - Professional & Eye-friendly */
    --primary-gradient: linear-gradient(135deg, #2563eb 0%, #1d4ed8 50%, #1e40af 100%);
    --secondary-gradient: linear-gradient(135deg, #0891b2 0%, #0e7490 100%);
    --accent-gradient: linear-gradient(135deg, #059669 0%, #047857 100%);
    --warning-gradient: linear-gradient(135deg, #d97706 0%, #b45309 100%);
    --danger-gradient: linear-gradient(135deg, #dc2626 0%, #b91c1c 100%);
    
    /* Primary Colors - Professional Blue */
    --primary-50: #eff6ff;
    --primary-100: #dbeafe;
    --primary-200: #bfdbfe;
    --primary-300: #93c5fd;
    --primary-400: #60a5fa;
    --primary-500: #3b82f6;
    --primary-600: #2563eb;
    --primary-700: #1d4ed8;
    --primary-800: #1e40af;
    --primary-900: #1e3a8a;
    
    /* Neutral Colors - Warm Gray for comfort */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Semantic Colors */
    --success-light: #d1fae5;
    --success-main: #059669;
    --success-dark: #047857;
    
    --warning-light: #fed7aa;
    --warning-main: #d97706;
    --warning-dark: #b45309;
    
    --error-light: #fee2e2;
    --error-main: #dc2626;
    --error-dark: #b91c1c;
    
    --info-light: #dbeafe;
    --info-main: #2563eb;
    --info-dark: #1d4ed8;
    
    /* Background & Surface Colors */
    --bg-primary: #ffffff;
    --bg-secondary: var(--gray-50);
    --bg-tertiary: var(--gray-100);
    --bg-elevated: #ffffff;
    --bg-overlay: rgba(17, 24, 39, 0.4);
    --bg-gradient-main: linear-gradient(135deg, var(--gray-50) 0%, #ffffff 100%);
    
    /* Text Colors */
    --text-primary: var(--gray-900);
    --text-secondary: var(--gray-600);
    --text-tertiary: var(--gray-500);
    --text-light: var(--gray-400);
    --text-white: #ffffff;
    --text-inverse: var(--gray-50);
    
    /* Border & Divider Colors */
    --border-light: var(--gray-200);
    --border-main: var(--gray-300);
    --border-strong: var(--gray-400);
    --border-primary: var(--primary-300);
    --border-focus: var(--primary-500);
    
    /* Shadow Colors */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-colored: 0 10px 15px -3px rgba(37, 99, 235, 0.1), 0 4px 6px -2px rgba(37, 99, 235, 0.05);
    
    /* Typography */
    --font-family: 'Kanit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'SF Mono', Monaco, Inconsolata, 'Roboto Mono', monospace;
    
    --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;
    --font-size-5xl: 3rem;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-normal: 250ms ease-out;
    --transition-slow: 350ms ease-out;
    
    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
}

/* Base Styles */
html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--text-primary);
    background: var(--bg-gradient-main);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Navigation */
.navbar {
    background: var(--glass-bg);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--glass-border);
    box-shadow: var(--shadow-sm);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: var(--transition-normal);
}

.nav-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    color: var(--primary-600);
    font-weight: 600;
    font-size: var(--font-size-lg);
    text-decoration: none;
    transition: var(--transition-fast);
}

.nav-brand:hover {
    color: var(--primary-700);
    transform: translateY(-1px);
}

.nav-brand i {
    font-size: var(--font-size-2xl);
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-lg);
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    opacity: 0.1;
    transition: var(--transition-normal);
    z-index: -1;
}

.nav-link:hover::before,
.nav-link.active::before {
    left: 0;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-600);
    transform: translateY(-1px);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.nav-toggle:hover {
    background: var(--bg-tertiary);
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-secondary);
    border-radius: var(--radius-full);
    transition: var(--transition-fast);
}

/* Main Content */
.main-content {
    margin-top: 72px;
    min-height: calc(100vh - 72px);
}

.section {
    display: none;
    padding: var(--space-16) 0;
    animation: fadeInUp 0.6s ease-out;
}

.section.active {
    display: block;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.section-header h2 {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    line-height: var(--line-height-tight);
}

.section-header p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: var(--line-height-relaxed);
}

/* ==================== HOME SECTION ==================== */
#home .welcome-card {
    background: linear-gradient(135deg, #ffffff 0%, #f8fafc 100%);
    border-radius: var(--radius-2xl);
    padding: var(--space-20);
    box-shadow: var(--shadow-xl);
    text-align: center;
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
    margin-bottom: var(--space-16);
}

#home .welcome-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: var(--primary-gradient);
}

#home .welcome-card::after {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 200px;
    height: 200px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.05) 0%, transparent 70%);
    border-radius: 50%;
}

#home .welcome-header h1 {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--space-4);
    line-height: var(--line-height-tight);
}

#home .welcome-header p {
    font-size: var(--font-size-xl);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
    font-weight: 500;
}

#home .org-name {
    font-size: var(--font-size-lg);
    color: var(--primary-600);
    font-weight: 600;
    margin-bottom: var(--space-16);
    padding: var(--space-4);
    background: var(--primary-50);
    border-radius: var(--radius-xl);
    border: 1px solid var(--primary-200);
    display: inline-block;
}

#home .quick-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-16);
}

#home .stat-card {
    background: var(--bg-elevated);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    display: flex;
    align-items: center;
    gap: var(--space-4);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
}

#home .stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary-gradient);
    transition: var(--transition-normal);
}

#home .stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--border-primary);
}

#home .stat-card:hover::before {
    width: 100%;
    opacity: 0.05;
}

#home .stat-card i {
    font-size: var(--font-size-3xl);
    padding: var(--space-4);
    border-radius: var(--radius-xl);
    background: var(--primary-gradient);
    color: var(--text-white);
    min-width: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
}

#home .stat-number {
    display: block;
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--text-primary);
    line-height: var(--line-height-tight);
}

#home .stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

#home .cta-buttons {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* ==================== PROFILE SECTION ==================== */
#profile .profile-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-2xl);
    padding: var(--space-12);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
    position: relative;
    overflow: hidden;
    max-width: 800px;
    margin: 0 auto;
}

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

#profile .profile-avatar {
    text-align: center;
    margin-bottom: var(--space-8);
}

#profile .profile-avatar i {
    font-size: 6rem;
    color: var(--primary-600);
    background: var(--primary-50);
    border-radius: 50%;
    padding: var(--space-8);
    border: 3px solid var(--primary-200);
    margin-bottom: var(--space-4);
}

#profile .profile-info {
    display: grid;
    gap: var(--space-4);
}

#profile .info-row {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: var(--transition-fast);
    align-items: center;
}

#profile .info-row:hover {
    background: var(--bg-tertiary);
    transform: translateX(var(--space-1));
}

#profile .info-row label {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    font-weight: 600;
    margin: 0;
}

#profile .info-row span {
    font-size: var(--font-size-base);
    color: var(--text-primary);
    font-weight: 500;
}

/* ==================== COURSES SECTION ==================== */
#courses .eligibility-status {
    background: var(--info-light);
    border: 1px solid var(--info-main);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    margin-bottom: var(--space-8);
    text-align: center;
}

#courses .status-checking {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    color: var(--info-dark);
    font-weight: 600;
}

#courses .status-checking i {
    font-size: var(--font-size-xl);
    animation: spin 1s linear infinite;
}

#courses .courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: var(--space-8);
}

#courses .course-card {
    background: var(--bg-elevated);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    transition: var(--transition-normal);
    position: relative;
}

#courses .course-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-primary);
}

#courses .course-header {
    background: var(--primary-gradient);
    color: var(--text-white);
    padding: var(--space-8);
    text-align: center;
    position: relative;
}

#courses .course-header i {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--space-4);
    background: rgba(255, 255, 255, 0.2);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-left: auto;
    margin-right: auto;
}

#courses .course-header h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--space-2);
}

#courses .course-details {
    padding: var(--space-8);
}

#courses .course-details p {
    color: var(--text-secondary);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-base);
    line-height: var(--line-height-relaxed);
}

#courses .course-details ul {
    list-style: none;
    padding: 0;
    margin-bottom: var(--space-6);
}

#courses .course-details li {
    padding: var(--space-2) var(--space-3);
    margin-bottom: var(--space-2);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--primary-500);
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
}

#courses .course-quota {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
    padding: var(--space-6);
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
}

#courses .quota-item {
    text-align: center;
    padding: var(--space-4);
    border-radius: var(--radius-md);
}

#courses .quota-item.main {
    background: var(--success-light);
    border: 1px solid var(--success-main);
}

#courses .quota-item.reserve {
    background: var(--warning-light);
    border: 1px solid var(--warning-main);
}

#courses .quota-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: var(--space-1);
}

#courses .quota-count {
    font-size: var(--font-size-xl);
    font-weight: 800;
    color: var(--text-primary);
}

/* ==================== STATUS SECTION ==================== */
#status .no-registration {
    text-align: center;
    padding: var(--space-20);
    background: var(--bg-elevated);
    border-radius: var(--radius-2xl);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-lg);
}

#status .no-registration i {
    font-size: var(--font-size-4xl);
    color: var(--info-main);
    margin-bottom: var(--space-4);
}

#status .no-registration p {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
}

#status .registration-status {
    background: var(--bg-elevated);
    border-radius: var(--radius-2xl);
    padding: var(--space-12);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
    margin-bottom: var(--space-8);
    position: relative;
    overflow: hidden;
}

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

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    border: none;
    border-radius: var(--radius-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
    overflow: hidden;
    white-space: nowrap;
    user-select: none;
    line-height: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-normal);
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--primary-gradient);
    color: var(--text-white);
    box-shadow: var(--shadow-colored);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    filter: brightness(110%);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--primary-600);
    border: 2px solid var(--primary-500);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: var(--primary-50);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-success {
    background: var(--accent-gradient);
    color: var(--text-white);
    box-shadow: 0 4px 14px 0 rgba(5, 150, 105, 0.25);
}

.btn-warning {
    background: var(--warning-gradient);
    color: var(--text-white);
    box-shadow: 0 4px 14px 0 rgba(212, 125, 15, 0.25);
}

.btn-danger {
    background: var(--danger-gradient);
    color: var(--text-white);
    box-shadow: 0 4px 14px 0 rgba(220, 38, 38, 0.25);
}

.btn-logout {
    background: var(--warning-gradient);
    color: var(--text-white);
    padding: var(--space-2) var(--space-4);
    font-size: var(--font-size-sm);
}

.btn-register {
    width: 100%;
    justify-content: center;
    background: var(--accent-gradient);
    color: var(--text-white);
    font-weight: 600;
    padding: var(--space-4) var(--space-6);
}

.btn:disabled {
    background: var(--gray-400);
    color: var(--text-white);
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
    filter: none !important;
}

.btn:disabled::before {
    display: none;
}

/* ==================== Modal ==================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    backdrop-filter: blur(8px);
    z-index: 2000;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background: var(--bg-elevated);
    border-radius: var(--radius-2xl);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
    animation: slideInUp 0.4s ease-out;
}

.modal-header {
    padding: var(--space-6);
    border-bottom: 1px solid var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h3 {
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: var(--font-size-2xl);
    color: var(--text-light);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
}

.modal-body {
    padding: var(--space-6);
}

.modal-footer {
    padding: var(--space-6);
    border-top: 1px solid var(--border-light);
    display: flex;
    gap: var(--space-3);
    justify-content: flex-end;
}

/* ==================== Forms ==================== */
.form-group {
    margin-bottom: var(--space-6);
}

.form-group label {
    display: block;
    margin-bottom: var(--space-2);
    font-weight: 600;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
}

.form-group input {
    width: 100%;
    padding: var(--space-4);
    border: 2px solid var(--border-main);
    border-radius: var(--radius-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    background: var(--bg-elevated);
    color: var(--text-primary);
    transition: var(--transition-fast);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
    background: var(--bg-primary);
}

.form-group small {
    display: block;
    margin-top: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--text-light);
}

/* ==================== Loading & Overlays ==================== */
.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    backdrop-filter: blur(8px);
    z-index: 3000;
}

.loading-overlay.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.loading-spinner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    color: var(--primary-600);
    text-align: center;
}

.loading-spinner i {
    font-size: var(--font-size-4xl);
    animation: spin 1s linear infinite;
}

.loading-spinner span {
    font-weight: 600;
    font-size: var(--font-size-lg);
}

/* ==================== Alerts ==================== */
.alert-container {
    position: fixed;
    top: 100px;
    right: var(--space-6);
    z-index: 4000;
    max-width: 400px;
}

.alert {
    padding: var(--space-4) var(--space-6);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-weight: 500;
    border: 1px solid;
    animation: slideInRight 0.4s ease-out;
    box-shadow: var(--shadow-lg);
}

.alert i {
    font-size: var(--font-size-lg);
    flex-shrink: 0;
}

.alert-success {
    background: var(--success-light);
    color: var(--success-dark);
    border-color: var(--success-main);
}

.alert-error {
    background: var(--error-light);
    color: var(--error-dark);
    border-color: var(--error-main);
}

.alert-warning {
    background: var(--warning-light);
    color: var(--warning-dark);
    border-color: var(--warning-main);
}

.alert-info {
    background: var(--info-light);
    color: var(--info-dark);
    border-color: var(--info-main);
}

/* ==================== Animations ==================== */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(60px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(100px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ==================== Responsive Design ==================== */
@media (max-width: 768px) {
    :root {
        --space-16: 3rem;
        --space-20: 4rem;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        background: var(--glass-bg);
        backdrop-filter: blur(20px) saturate(180%);
        border-top: 1px solid var(--border-light);
        flex-direction: column;
        padding: var(--space-6);
        gap: var(--space-4);
        transform: translateY(-100vh);
        transition: var(--transition-normal);
        z-index: 999;
    }
    
    .nav-menu.active {
        transform: translateY(0);
    }
    
    .section-header h2 {
        font-size: var(--font-size-3xl);
    }
    
    #home .welcome-header h1 {
        font-size: var(--font-size-4xl);
    }
    
    #home .quick-stats {
        grid-template-columns: 1fr;
    }
    
    #home .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }
    
    #courses .courses-grid {
        grid-template-columns: 1fr;
    }
    
    #profile .info-row {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }
    
    .modal-content {
        width: 95%;
        margin: var(--space-4);
    }
    
    .container {
        padding: 0 var(--space-4);
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 var(--space-4);
    }
    
    #home .welcome-card {
        padding: var(--space-12);
    }
    
    .modal-header,
    .modal-body,
    .modal-footer {
        padding: var(--space-4);
    }

}
    /* gallery */
    /* ==================== GALLERY SECTION ==================== */
.gallery-section {
    background: var(--bg-elevated);
    border-radius: var(--radius-2xl);
    padding: var(--space-12);
    box-shadow: var(--shadow-xl);
    border: 1px solid var(--border-light);
    margin-top: var(--space-16);
    position: relative;
    overflow: hidden;
}

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

.gallery-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.gallery-header h3 {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-3);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
}

.gallery-header h3 i {
    color: var(--primary-600);
    background: var(--primary-50);
    padding: var(--space-3);
    border-radius: var(--radius-lg);
}

.gallery-header p {
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    max-width: 600px;
    margin: 0 auto;
    line-height: var(--line-height-relaxed);
}

.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    cursor: pointer;
    transition: var(--transition-normal);
    aspect-ratio: 4/3;
    background: var(--bg-secondary);
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
}

.gallery-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--border-primary);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: var(--text-white);
    padding: var(--space-6);
    transform: translateY(100%);
    transition: var(--transition-normal);
}

.gallery-item:hover .gallery-overlay {
    transform: translateY(0);
}

.gallery-title {
    font-weight: 600;
    font-size: var(--font-size-base);
    margin-bottom: var(--space-2);
    line-height: var(--line-height-tight);
}

.gallery-description {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    line-height: var(--line-height-normal);
}

/* ==================== LIGHTBOX ==================== */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    z-index: 3000;
    display: none;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
}

.lightbox.active {
    display: flex;
    animation: fadeIn 0.3s ease-out;
}

.lightbox-content {
    position: relative;
    max-width: 90%;
    max-height: 90%;
    animation: slideInUp 0.4s ease-out;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

.lightbox-close {
    position: absolute;
    top: -50px;
    right: 0;
    color: var(--text-white);
    font-size: var(--font-size-3xl);
    cursor: pointer;
    background: none;
    border: none;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: scale(1.1);
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    border: none;
    font-size: var(--font-size-2xl);
    padding: var(--space-4);
    cursor: pointer;
    border-radius: 50%;
    transition: var(--transition-fast);
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(8px);
}

.lightbox-nav:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: translateY(-50%) scale(1.1);
}

.lightbox-prev {
    left: -80px;
}

.lightbox-next {
    right: -80px;
}

.lightbox-info {
    position: absolute;
    bottom: -80px;
    left: 0;
    right: 0;
    color: var(--text-white);
    text-align: center;
    padding: var(--space-4);
}

.lightbox-info h4 {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--space-2);
}

.lightbox-info p {
    font-size: var(--font-size-base);
    opacity: 0.9;
    line-height: var(--line-height-normal);
}

/* ==================== Utility Classes ==================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.d-none { display: none !important; }
.d-block { display: block !important; }
.d-flex { display: flex !important; }
.d-grid { display: grid !important; }

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.w-full { width: 100%; }
.h-full { height: 100%; }

.mt-0 { margin-top: 0 !important; }
.mt-4 { margin-top: var(--space-4) !important; }
.mb-0 { margin-bottom: 0 !important; }
.mb-4 { margin-bottom: var(--space-4) !important; }

.p-4 { padding: var(--space-4) !important; }
.rounded-lg { border-radius: var(--radius-lg) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }