/**
 * DESIGN SYSTEM - OTP Textnow
 * Modern Design System với CSS Variables
 * Created: 2026-03-06
 */

/* ============================================
   ROOT VARIABLES - LIGHT MODE (DEFAULT)
   ============================================ */
:root {
    /* Primary Colors - Blue Gradient */
    --color-primary: #3B82F6;
    --color-primary-dark: #2563EB;
    --color-primary-light: #60A5FA;
    --color-primary-rgb: 59, 130, 246;

    /* Accent Colors - Purple Gradient */
    --color-accent: #8B5CF6;
    --color-accent-dark: #7C3AED;
    --color-accent-light: #A78BFA;
    --color-accent-rgb: 139, 92, 246;

    /* Semantic Colors */
    --color-success: #10B981;
    --color-success-light: #34D399;
    --color-warning: #F59E0B;
    --color-warning-light: #FBBF24;
    --color-danger: #EF4444;
    --color-danger-light: #F87171;
    --color-info: #3B82F6;
    --color-info-light: #60A5FA;

    /* Neutral Colors */
    --color-white: #FFFFFF;
    --color-black: #000000;
    --color-gray-50: #F9FAFB;
    --color-gray-100: #F3F4F6;
    --color-gray-200: #E5E7EB;
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-gray-700: #374151;
    --color-gray-800: #1F2937;
    --color-gray-900: #111827;

    /* Background Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F9FAFB;
    --bg-tertiary: #F3F4F6;
    --bg-overlay: rgba(0, 0, 0, 0.5);

    /* Text Colors */
    --text-primary: #111827;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    --text-inverse: #FFFFFF;
    --color-text: #111827;

    /* Border Colors */
    --border-color: #E5E7EB;
    --border-color-light: #F3F4F6;
    --border-color-dark: #D1D5DB;

    /* Spacing System - 8px base */
    --spacing-1: 0.25rem;  /* 4px */
    --spacing-2: 0.5rem;   /* 8px */
    --spacing-3: 0.75rem;  /* 12px */
    --spacing-4: 1rem;     /* 16px */
    --spacing-5: 1.25rem;  /* 20px */
    --spacing-6: 1.5rem;   /* 24px */
    --spacing-8: 2rem;     /* 32px */
    --spacing-10: 2.5rem;  /* 40px */
    --spacing-12: 3rem;    /* 48px */
    --spacing-16: 4rem;    /* 64px */

    /* Typography */
    --font-family-base: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Border Radius */
    --radius-sm: 0.25rem;   /* 4px */
    --radius-md: 0.375rem;  /* 6px */
    --radius-lg: 0.5rem;    /* 8px */
    --radius-xl: 0.75rem;   /* 12px */
    --radius-2xl: 1rem;     /* 16px */
    --radius-full: 9999px;  /* Pill shape */

    /* Shadows */
    --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-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 20px rgba(59, 130, 246, 0.4);
    --shadow-glow-accent: 0 0 20px rgba(139, 92, 246, 0.4);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Z-index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--color-primary) 0%, var(--color-accent) 100%);
    --gradient-success: linear-gradient(135deg, #34D399 0%, #10B981 100%);
    --gradient-warning: linear-gradient(135deg, #FBBF24 0%, #F59E0B 100%);
    --gradient-danger: linear-gradient(135deg, #F87171 0%, #EF4444 100%);
    --gradient-blue: linear-gradient(135deg, #60A5FA 0%, #3B82F6 100%);
    --gradient-purple: linear-gradient(135deg, #A78BFA 0%, #8B5CF6 100%);
    
    /* Glassmorphism */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-blur: 10px;
}

/* ============================================
   DARK MODE VARIABLES
   ============================================ */
[data-theme="dark"] {
    /* Primary Colors - Adjusted for dark mode */
    --color-primary: #60A5FA;
    --color-primary-dark: #3B82F6;
    --color-primary-light: #93C5FD;

    /* Accent Colors - Adjusted for dark mode */
    --color-accent: #A78BFA;
    --color-accent-dark: #8B5CF6;
    --color-accent-light: #C4B5FD;

    /* Semantic Colors - Brighter for dark background */
    --color-success: #34D399;
    --color-success-light: #6EE7B7;
    --color-warning: #FBBF24;
    --color-warning-light: #FCD34D;
    --color-danger: #F87171;
    --color-danger-light: #FCA5A5;
    --color-info: #60A5FA;
    --color-info-light: #93C5FD;

    /* Background Colors - Dark theme */
    --bg-primary: #111827;      /* gray-900 */
    --bg-secondary: #1F2937;    /* gray-800 */
    --bg-tertiary: #374151;     /* gray-700 */
    --bg-overlay: rgba(0, 0, 0, 0.7);

    /* Text Colors - Inverted */
    --text-primary: #F9FAFB;    /* gray-50 */
    --text-secondary: #D1D5DB;  /* gray-300 */
    --text-tertiary: #9CA3AF;   /* gray-400 */
    --text-inverse: #111827;    /* gray-900 */
    --color-text: #F9FAFB;      /* alias for dark */
    --color-white: #1F2937;     /* white becomes dark bg in dark mode */

    /* Border Colors - Lighter for visibility */
    --border-color: #374151;    /* gray-700 */
    --border-color-light: #4B5563;  /* gray-600 */
    --border-color-dark: #1F2937;   /* gray-800 */

    /* Shadows - Adjusted for dark mode */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -2px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(96, 165, 250, 0.5);
    --shadow-glow-accent: 0 0 20px rgba(167, 139, 250, 0.5);

    /* Glassmorphism - Dark mode */
    --glass-bg: rgba(31, 41, 55, 0.7);      /* gray-800 with opacity */
    --glass-border: rgba(75, 85, 99, 0.3);  /* gray-600 with opacity */
    --glass-blur: 10px;

    /* Card backgrounds - Slightly lighter than bg-primary */
    --color-card-bg: #1F2937;     /* gray-800 */
    --color-card-border: #374151; /* gray-700 */
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

/* Text Utilities */
.text-primary { color: var(--color-primary) !important; }
.text-accent { color: var(--color-accent) !important; }
.text-success { color: var(--color-success) !important; }
.text-warning { color: var(--color-warning) !important; }
.text-danger { color: var(--color-danger) !important; }
.text-info { color: var(--color-info) !important; }
.text-muted { color: var(--text-secondary) !important; }
.text-white { color: var(--color-white) !important; }

/* Background Utilities */
.bg-primary { background-color: var(--color-primary) !important; }
.bg-accent { background-color: var(--color-accent) !important; }
.bg-success { background-color: var(--color-success) !important; }
.bg-warning { background-color: var(--color-warning) !important; }
.bg-danger { background-color: var(--color-danger) !important; }
.bg-gray-50 { background-color: var(--color-gray-50) !important; }
.bg-gray-100 { background-color: var(--color-gray-100) !important; }
.bg-white { background-color: var(--color-white) !important; }

/* Gradient Utilities */
.bg-gradient-primary { background: var(--gradient-primary) !important; }
.bg-gradient-success { background: var(--gradient-success) !important; }
.bg-gradient-warning { background: var(--gradient-warning) !important; }
.bg-gradient-danger { background: var(--gradient-danger) !important; }

/* Border Utilities */
.border-primary { border-color: var(--color-primary) !important; }
.border-gray-200 { border-color: var(--color-gray-200) !important; }
.border-gray-300 { border-color: var(--color-gray-300) !important; }

/* Rounded Utilities */
.rounded-sm { border-radius: var(--radius-sm) !important; }
.rounded-md { border-radius: var(--radius-md) !important; }
.rounded-lg { border-radius: var(--radius-lg) !important; }
.rounded-xl { border-radius: var(--radius-xl) !important; }
.rounded-2xl { border-radius: var(--radius-2xl) !important; }
.rounded-full { border-radius: var(--radius-full) !important; }

/* Shadow Utilities */
.shadow-xs { box-shadow: var(--shadow-xs) !important; }
.shadow-sm { box-shadow: var(--shadow-sm) !important; }
.shadow-md { box-shadow: var(--shadow-md) !important; }
.shadow-lg { box-shadow: var(--shadow-lg) !important; }
.shadow-xl { box-shadow: var(--shadow-xl) !important; }
.shadow-2xl { box-shadow: var(--shadow-2xl) !important; }
.shadow-none { box-shadow: none !important; }

/* Transition Utilities */
.transition-all { transition: all var(--transition-base) !important; }
.transition-fast { transition: all var(--transition-fast) !important; }
.transition-slow { transition: all var(--transition-slow) !important; }

/* Font Weight Utilities */
.font-normal { font-weight: var(--font-weight-normal) !important; }
.font-medium { font-weight: var(--font-weight-medium) !important; }
.font-semibold { font-weight: var(--font-weight-semibold) !important; }
.font-bold { font-weight: var(--font-weight-bold) !important; }

/* Font Size Utilities */
.text-xs { font-size: var(--font-size-xs) !important; }
.text-sm { font-size: var(--font-size-sm) !important; }
.text-base { font-size: var(--font-size-base) !important; }
.text-lg { font-size: var(--font-size-lg) !important; }
.text-xl { font-size: var(--font-size-xl) !important; }
.text-2xl { font-size: var(--font-size-2xl) !important; }
.text-3xl { font-size: var(--font-size-3xl) !important; }
.text-4xl { font-size: var(--font-size-4xl) !important; }

/* Spacing Utilities - Margins */
.m-0 { margin: 0 !important; }
.m-1 { margin: var(--spacing-1) !important; }
.m-2 { margin: var(--spacing-2) !important; }
.m-3 { margin: var(--spacing-3) !important; }
.m-4 { margin: var(--spacing-4) !important; }
.m-5 { margin: var(--spacing-5) !important; }
.m-6 { margin: var(--spacing-6) !important; }

.mt-0 { margin-top: 0 !important; }
.mt-1 { margin-top: var(--spacing-1) !important; }
.mt-2 { margin-top: var(--spacing-2) !important; }
.mt-3 { margin-top: var(--spacing-3) !important; }
.mt-4 { margin-top: var(--spacing-4) !important; }
.mt-5 { margin-top: var(--spacing-5) !important; }
.mt-6 { margin-top: var(--spacing-6) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-1 { margin-bottom: var(--spacing-1) !important; }
.mb-2 { margin-bottom: var(--spacing-2) !important; }
.mb-3 { margin-bottom: var(--spacing-3) !important; }
.mb-4 { margin-bottom: var(--spacing-4) !important; }
.mb-5 { margin-bottom: var(--spacing-5) !important; }
.mb-6 { margin-bottom: var(--spacing-6) !important; }

/* Using Bootstrap 5 naming (me/ms instead of mr/ml) */
.me-0 { margin-right: 0 !important; }
.me-1 { margin-right: var(--spacing-1) !important; }
.me-2 { margin-right: var(--spacing-2) !important; }
.me-3 { margin-right: var(--spacing-3) !important; }
.me-4 { margin-right: var(--spacing-4) !important; }

.ms-0 { margin-left: 0 !important; }
.ms-1 { margin-left: var(--spacing-1) !important; }
.ms-2 { margin-left: var(--spacing-2) !important; }
.ms-3 { margin-left: var(--spacing-3) !important; }
.ms-4 { margin-left: var(--spacing-4) !important; }

/* Spacing Utilities - Padding */
.p-0 { padding: 0 !important; }
.p-1 { padding: var(--spacing-1) !important; }
.p-2 { padding: var(--spacing-2) !important; }
.p-3 { padding: var(--spacing-3) !important; }
.p-4 { padding: var(--spacing-4) !important; }
.p-5 { padding: var(--spacing-5) !important; }
.p-6 { padding: var(--spacing-6) !important; }

.pt-0 { padding-top: 0 !important; }
.pt-4 { padding-top: var(--spacing-4) !important; }
.pt-5 { padding-top: var(--spacing-5) !important; }
.pt-6 { padding-top: var(--spacing-6) !important; }

.pb-0 { padding-bottom: 0 !important; }
.pb-4 { padding-bottom: var(--spacing-4) !important; }
.pb-5 { padding-bottom: var(--spacing-5) !important; }
.pb-6 { padding-bottom: var(--spacing-6) !important; }

/* Using Bootstrap 5 naming (pe/ps instead of pr/pl) */
.pe-0 { padding-right: 0 !important; }
.pe-3 { padding-right: var(--spacing-3) !important; }
.pe-4 { padding-right: var(--spacing-4) !important; }

.ps-0 { padding-left: 0 !important; }
.ps-3 { padding-left: var(--spacing-3) !important; }
.ps-4 { padding-left: var(--spacing-4) !important; }

/* Display Utilities */
.d-flex { display: flex !important; }
.d-inline-flex { display: inline-flex !important; }
.d-grid { display: grid !important; }
.d-block { display: block !important; }
.d-inline-block { display: inline-block !important; }
.d-none { display: none !important; }

/* Flex Utilities */
.flex-row { flex-direction: row !important; }
.flex-column { flex-direction: column !important; }
.flex-wrap { flex-wrap: wrap !important; }
.flex-nowrap { flex-wrap: nowrap !important; }
.justify-content-start { justify-content: flex-start !important; }
.justify-content-center { justify-content: center !important; }
.justify-content-end { justify-content: flex-end !important; }
.justify-content-between { justify-content: space-between !important; }
.align-items-start { align-items: flex-start !important; }
.align-items-center { align-items: center !important; }
.align-items-end { align-items: flex-end !important; }
.flex-grow-1 { flex-grow: 1 !important; }

/* Position Utilities */
.position-relative { position: relative !important; }
.position-absolute { position: absolute !important; }
.position-fixed { position: fixed !important; }
.position-sticky { position: sticky !important; }

/* Overflow Utilities */
.overflow-hidden { overflow: hidden !important; }
.overflow-auto { overflow: auto !important; }
.overflow-x-auto { overflow-x: auto !important; }
.overflow-y-auto { overflow-y: auto !important; }

/* Width Utilities */
.w-25 { width: 25% !important; }
.w-50 { width: 50% !important; }
.w-75 { width: 75% !important; }
.w-100 { width: 100% !important; }
.w-auto { width: auto !important; }

/* Height Utilities */
.h-100 { height: 100% !important; }
.h-auto { height: auto !important; }

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

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

/* Animation Utilities */
.animate-fadeIn { animation: fadeIn var(--transition-base); }
.animate-fadeInUp { animation: fadeInUp var(--transition-slow); }
.animate-slideDown { animation: slideDown var(--transition-fast); }
.animate-pulse { animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite; }
.animate-spin { animation: spin 1s linear infinite; }

/* ============================================
   ACCESSIBILITY - Reduced Motion Support
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================================
   RESPONSIVE HELPERS
   ============================================ */
@media (max-width: 768px) {
    .d-md-none { display: none !important; }
    .d-md-block { display: block !important; }
}

@media (min-width: 769px) {
    .d-none { display: none !important; }
    .d-md-block { display: block !important; }
}

/* ============================================
   THEME TRANSITION
   ============================================ */

/* Smooth transition when changing themes */
html.theme-transitioning,
html.theme-transitioning *,
html.theme-transitioning *::before,
html.theme-transitioning *::after {
    transition: background-color var(--transition-slow),
                color var(--transition-slow),
                border-color var(--transition-slow),
                box-shadow var(--transition-slow) !important;
    transition-delay: 0s !important;
}

/* Theme visibility - always visible */
html {
    visibility: visible;
}

/* Dark mode specific adjustments */
[data-theme="dark"] {
    color-scheme: dark;
}

[data-theme="dark"] body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

[data-theme="dark"] .card,
[data-theme="dark"] .modal-content,
[data-theme="dark"] .dropdown-menu {
    background-color: var(--bg-secondary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .table {
    color: var(--text-primary);
}

[data-theme="dark"] .table-striped tbody tr:nth-of-type(odd) {
    background-color: rgba(255, 255, 255, 0.02);
}

[data-theme="dark"] .form-control,
[data-theme="dark"] .form-select {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="dark"] .form-control:focus,
[data-theme="dark"] .form-select:focus {
    background-color: var(--bg-tertiary);
    border-color: var(--color-primary);
    color: var(--text-primary);
}

[data-theme="dark"] .form-control::placeholder {
    color: var(--text-tertiary);
}

/* Theme toggle button styles */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-2);
    padding: var(--spacing-3) var(--spacing-4);
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    color: var(--text-primary);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
    border-color: var(--color-primary);
    transform: translateY(-1px);
}

.theme-toggle i {
    font-size: var(--font-size-lg);
    transition: transform var(--transition-fast);
}

.theme-toggle:hover i {
    transform: rotate(20deg) scale(1.1);
}

[data-theme="dark"] .theme-toggle i {
    color: var(--color-warning);
}

/* Compact theme toggle for sidebar */
.theme-toggle-compact {
    width: 40px;
    height: 40px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
}

.theme-toggle-compact .toggle-text {
    display: none;
}