/**
 * AI Ads Automation Platform - Main Stylesheet
 * Modern, Premium Design with Glassmorphism & Gradients
 */

/* ============================================
   CSS Variables & Theme
   ============================================ */
:root {
    /* Primary Colors */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    
    /* Secondary Colors */
    --secondary: #ec4899;
    --secondary-dark: #db2777;
    --secondary-light: #f472b6;
    
    /* Accent Colors */
    --accent: #10b981;
    --accent-dark: #059669;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Neutral Colors */
    --dark: #0f172a;
    --dark-800: #1e293b;
    --dark-700: #334155;
    --dark-600: #475569;
    --gray: #64748b;
    --light-gray: #cbd5e1;
    --light: #f1f5f9;
    --white: #ffffff;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-warm: linear-gradient(135deg, #fa709a 0%, #fee140 100%);
    --gradient-cool: linear-gradient(135deg, #30cfd0 0%, #330867 100%);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    font-weight: 400;
    line-height: 1.6;
    color: var(--dark);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    background-attachment: fixed;
    min-height: 100vh;
}

body.font-kanit {
    font-family: 'Kanit', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {font-size: 2.5rem;}
h2 {font-size: 2rem;}
h3 {font-size: 1.75rem;}
h4 {font-size: 1.5rem;}
h5 {font-size: 1.25rem;}
h6 {font-size: 1rem;}

p {
    margin-bottom: var(--spacing-sm);
}

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

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

/* ============================================
   Container & Layout
   ============================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

/* ============================================
   Language Switcher (Fixed)
   ============================================ */
.language-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.language-switcher select {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: var(--transition);
}

.language-switcher select:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* ============================================
   Cards & Glassmorphism
   ============================================ */
.card {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: var(--transition);
}

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

.card-glass {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.card-header {
    border-bottom: 1px solid var(--light-gray);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 0;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

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

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

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1rem;
}

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

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

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--light-gray);
    border-radius: var(--radius);
    font-size: 0.875rem;
    transition: var(--transition-fast);
    background: var(--white);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3E%3Cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3E%3C/svg%3E");
    background-position: right 0.5rem center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5rem;
}

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

.form-error {
    color: var(--danger);
    font-size: 0.75rem;
    margin-top: var(--spacing-xs);
}

/* ============================================
   Utilities
   ============================================ */
.text-center {
    text-align: center;
}

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

.mt-1 {margin-top: var(--spacing-xs);}
.mt-2 {margin-top: var(--spacing-sm);}
.mt-3 {margin-top: var(--spacing-md);}
.mt-4 {margin-top: var(--spacing-lg);}

.mb-1 {margin-bottom: var(--spacing-xs);}
.mb-2 {margin-bottom: var(--spacing-sm);}
.mb-3 {margin-bottom: var(--spacing-md);}
.mb-4 {margin-bottom: var(--spacing-lg);}

.p-1 {padding: var(--spacing-xs);}
.p-2 {padding: var(--spacing-sm);}
.p-3 {padding: var(--spacing-md);}
.p-4 {padding: var(--spacing-lg);}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

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

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-1 {gap: var(--spacing-xs);}
.gap-2 {gap: var(--spacing-sm);}
.gap-3 {gap: var(--spacing-md);}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
    h1 {font-size: 2rem;}
    h2 {font-size: 1.75rem;}
    h3 {font-size: 1.5rem;}
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .card {
        padding: var(--spacing-md);
    }
}

/* ============================================
   Loading Animation
   ============================================ */
.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--light-gray);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================
   Notification Toast
   ============================================ */
.toast {
    position: fixed;
    top: 80px;
    right: 20px;
    background: var(--white);
    padding: 1rem 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-xl);
    z-index: 9999;
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.success {
    border-left: 4px solid var(--accent);
}

.toast.error {
    border-left: 4px solid var(--danger);
}

.toast.warning {
    border-left: 4px solid var(--warning);
}

.toast.info {
    border-left: 4px solid var(--primary);
}