/**
 * Injection Molding Training Portal - Main CSS Framework
 * Version: 2.0.0
 * Description: Unified styling for all training modules
 */

/* ==================== CSS Variables ==================== */
:root {
    /* Primary Colors */
    --primary-gradient: linear-gradient(135deg, #00d9ff, #0066ff);
    --secondary-gradient: linear-gradient(135deg, #ff6b35, #ff9800);
    --success-gradient: linear-gradient(135deg, #00c853, #00e676);
    --danger-gradient: linear-gradient(135deg, #f44336, #ff5252);
    --expert-gradient: linear-gradient(135deg, #9c27b0, #e91e63);
    
    /* Solid Colors */
    --primary: #00d9ff;
    --secondary: #ff6b35;
    --success: #00c853;
    --warning: #ff9800;
    --danger: #f44336;
    --info: #2196f3;
    
    /* Background Colors */
    --bg-dark: #0a1628;
    --bg-card: rgba(30, 42, 61, 0.9);
    --bg-card-hover: rgba(40, 55, 80, 0.95);
    --bg-overlay: rgba(0, 0, 0, 0.8);
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-muted: rgba(255, 255, 255, 0.5);
    
    /* Border */
    --border-color: rgba(255, 255, 255, 0.1);
    --border-hover: rgba(0, 217, 255, 0.3);
    
    /* Shadows */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 30px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(0, 217, 255, 0.3);
    
    /* Spacing */
    --spacing-xs: 5px;
    --spacing-sm: 10px;
    --spacing-md: 20px;
    --spacing-lg: 30px;
    --spacing-xl: 50px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 50%;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-Index */
    --z-dropdown: 100;
    --z-modal: 1000;
    --z-toast: 2000;
    --z-tooltip: 3000;
}

/* ==================== Reset & Base ==================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Sarabun', sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(ellipse at 20% 20%, rgba(0, 217, 255, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 80%, rgba(255, 107, 53, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(156, 39, 176, 0.05) 0%, transparent 70%);
    pointer-events: none;
    z-index: -1;
}

/* ==================== Typography ==================== */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Prompt', sans-serif;
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5em; }
h2 { font-size: 2em; }
h3 { font-size: 1.5em; }
h4 { font-size: 1.25em; }
h5 { font-size: 1.1em; }
h6 { font-size: 1em; }

.text-primary { color: var(--primary); }
.text-secondary { color: var(--secondary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-muted { color: var(--text-muted); }

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

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

a:hover {
    color: #fff;
}

/* ==================== Layout ==================== */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-md);
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 calc(var(--spacing-sm) * -1);
}

.col { flex: 1; padding: 0 var(--spacing-sm); }
.col-auto { flex: 0 0 auto; padding: 0 var(--spacing-sm); }
.col-6 { flex: 0 0 50%; max-width: 50%; padding: 0 var(--spacing-sm); }
.col-4 { flex: 0 0 33.333%; max-width: 33.333%; padding: 0 var(--spacing-sm); }
.col-3 { flex: 0 0 25%; max-width: 25%; padding: 0 var(--spacing-sm); }

/* Grid System */
.grid {
    display: grid;
    gap: var(--spacing-md);
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-auto { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }

/* ==================== Navigation ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 70px;
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--spacing-lg);
    z-index: var(--z-modal);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: 'Prompt', sans-serif;
    font-size: 1.4em;
    font-weight: 600;
    color: var(--text-primary);
}

.navbar-brand i {
    background: var(--secondary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.navbar-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.navbar-item {
    padding: 10px 18px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-normal);
    display: flex;
    align-items: center;
    gap: 8px;
}

.navbar-item:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.navbar-item.active {
    background: var(--primary-gradient);
    color: var(--bg-dark);
}

/* ==================== Cards ==================== */
.card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    transition: var(--transition-normal);
    backdrop-filter: blur(10px);
}

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

.card-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

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

.card-icon.basic { background: var(--primary-gradient); }
.card-icon.advanced { background: var(--secondary-gradient); }
.card-icon.expert { background: var(--expert-gradient); }

.card-title {
    font-size: 1.3em;
    margin-bottom: 5px;
}

.card-subtitle {
    color: var(--text-muted);
    font-size: 0.9em;
}

.card-body {
    color: var(--text-secondary);
    line-height: 1.7;
}

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

/* Course Cards */
.course-card {
    position: relative;
    overflow: hidden;
}

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

.course-card.basic::before { background: var(--primary-gradient); }
.course-card.advanced::before { background: var(--secondary-gradient); }
.course-card.expert::before { background: var(--expert-gradient); }

.course-progress {
    margin-top: var(--spacing-md);
}

.course-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
    font-size: 0.9em;
    color: var(--text-muted);
}

.course-meta span {
    display: flex;
    align-items: center;
    gap: 5px;
}

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius-sm);
    font-family: 'Sarabun', sans-serif;
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: var(--primary-gradient);
    color: var(--bg-dark);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
    color: var(--bg-dark);
}

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

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

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

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

.btn-lg {
    padding: 15px 35px;
    font-size: 1.1em;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.9em;
}

.btn-block {
    width: 100%;
}

/* ==================== Progress Bars ==================== */
.progress {
    height: 10px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 5px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    border-radius: 5px;
    background: var(--primary-gradient);
    transition: width var(--transition-slow);
}

.progress-bar.success { background: var(--success-gradient); }
.progress-bar.warning { background: var(--secondary-gradient); }
.progress-bar.danger { background: var(--danger-gradient); }

/* ==================== Badges ==================== */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85em;
    font-weight: 600;
}

.badge-primary { background: rgba(0, 217, 255, 0.2); color: var(--primary); }
.badge-secondary { background: rgba(255, 107, 53, 0.2); color: var(--secondary); }
.badge-success { background: rgba(0, 200, 83, 0.2); color: var(--success); }
.badge-warning { background: rgba(255, 152, 0, 0.2); color: var(--warning); }
.badge-danger { background: rgba(244, 67, 54, 0.2); color: var(--danger); }

.badge-level {
    padding: 8px 20px;
    border-radius: 25px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.badge-level.basic { background: var(--primary-gradient); color: var(--bg-dark); }
.badge-level.advanced { background: var(--secondary-gradient); color: white; }
.badge-level.expert { background: var(--expert-gradient); color: white; }

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

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1em;
    transition: var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.1);
}

.form-control::placeholder {
    color: var(--text-muted);
}

/* ==================== Modals ==================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-overlay);
    backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: var(--spacing-lg);
    max-width: 500px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--transition-normal);
}

.modal-overlay.show .modal {
    transform: scale(1);
}

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

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5em;
    cursor: pointer;
    transition: var(--transition-fast);
}

.modal-close:hover {
    color: var(--danger);
}

/* ==================== Alerts & Toasts ==================== */
.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.alert-success { background: rgba(0, 200, 83, 0.15); border-left: 4px solid var(--success); }
.alert-warning { background: rgba(255, 152, 0, 0.15); border-left: 4px solid var(--warning); }
.alert-danger { background: rgba(244, 67, 54, 0.15); border-left: 4px solid var(--danger); }
.alert-info { background: rgba(33, 150, 243, 0.15); border-left: 4px solid var(--info); }

.toast-container {
    position: fixed;
    top: 90px;
    right: 20px;
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.toast {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 15px 20px;
    min-width: 300px;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: var(--shadow-md);
    animation: slideIn 0.3s ease;
}

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

/* ==================== Hero Section ==================== */
.hero {
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
}

.hero-title {
    font-size: 3em;
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, #fff, #00d9ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3em;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
}

.hero-stat {
    text-align: center;
}

.hero-stat-value {
    font-size: 3em;
    font-weight: 700;
    color: var(--primary);
}

.hero-stat-label {
    color: var(--text-muted);
}

/* ==================== Course Levels Section ==================== */
.level-section {
    padding: var(--spacing-xl) 0;
}

.level-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.level-icon {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2em;
    color: white;
}

.level-icon.basic { background: var(--primary-gradient); }
.level-icon.advanced { background: var(--secondary-gradient); }
.level-icon.expert { background: var(--expert-gradient); }

/* ==================== Animations ==================== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

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

.fade-in { animation: fadeIn 0.5s ease forwards; }
.pulse { animation: pulse 2s infinite; }
.spin { animation: spin 1s linear infinite; }

/* ==================== Utilities ==================== */
.d-flex { display: flex; }
.d-grid { display: grid; }
.d-none { display: none; }
.d-block { display: block; }

.flex-wrap { flex-wrap: wrap; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-full { border-radius: var(--radius-full); }

.shadow { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-glow { box-shadow: var(--shadow-glow); }

/* ==================== Responsive ==================== */
@media (max-width: 1200px) {
    .grid-4 { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 992px) {
    .grid-4 { grid-template-columns: repeat(2, 1fr); }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .col-4, .col-3 { flex: 0 0 50%; max-width: 50%; }
    
    .navbar-menu {
        display: none;
    }
    
    .hero-title { font-size: 2.5em; }
}

@media (max-width: 768px) {
    .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .col-6, .col-4, .col-3 { flex: 0 0 100%; max-width: 100%; }
    
    .hero { padding: 100px 0 60px; }
    .hero-title { font-size: 2em; }
    .hero-subtitle { font-size: 1.1em; }
    
    .hero-stats { gap: var(--spacing-lg); }
    .hero-stat-value { font-size: 2em; }
    
    .level-header { flex-direction: column; text-align: center; }
}

@media (max-width: 576px) {
    :root {
        --spacing-md: 15px;
        --spacing-lg: 20px;
    }
    
    .container { padding: 0 15px; }
    .card { padding: var(--spacing-md); }
    
    h1 { font-size: 1.8em; }
    h2 { font-size: 1.5em; }
}