/* ========================================
   VIRAL CONTENT EDITOR - VIETNAMESE UI
   Common Styles & Design System
   ======================================== */

/* ========== CSS VARIABLES ========== */
:root {
    /* Background Colors */
    --bg-dark: #0f172a;
    --bg-darker: #020617;
    --bg-panel: #1e293b;
    --bg-hover: #334155;
    --bg-glass: rgba(30, 41, 59, 0.7);

    /* Primary Colors */
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --primary-glow: rgba(59, 130, 246, 0.3);

    /* Accent Colors */
    --accent: #8b5cf6;
    --accent-dark: #7c3aed;
    --accent-light: #a78bfa;

    /* Status Colors */
    --success: #10b981;
    --success-light: #34d399;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;

    /* Text Colors */
    --text-main: #f8fafc;
    --text-secondary: #e2e8f0;
    --text-muted: #94a3b8;
    --text-dark: #64748b;

    /* Border & Divider */
    --border: #334155;
    --border-light: #475569;
    --divider: rgba(51, 65, 85, 0.5);

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.3);
    --shadow-glow: 0 0 20px var(--primary-glow);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3b82f6, #8b5cf6);
    --gradient-success: linear-gradient(135deg, #10b981, #059669);
    --gradient-danger: linear-gradient(135deg, #ef4444, #dc2626);
    --gradient-dark: linear-gradient(180deg, #1e293b, #0f172a);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

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

/* ========== GLOBAL RESETS ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    font-size: 16px;
}

/* ========== TYPOGRAPHY ========== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: 'Outfit', 'Inter', sans-serif;
    font-weight: 600;
    line-height: 1.2;
    color: var(--text-main);
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

h6 {
    font-size: 1rem;
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

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

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

/* ========== BUTTONS ========== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.btn-secondary {
    background-color: var(--bg-hover);
    color: var(--text-main);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background-color: var(--bg-panel);
    border-color: var(--primary);
}

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

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

.btn-ghost {
    background: transparent;
    color: var(--text-muted);
}

.btn-ghost:hover {
    background-color: var(--bg-hover);
    color: var(--text-main);
}

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

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

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.85rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* Social Login Buttons */
.btn-social {
    background: white;
    color: #333;
    border: 1px solid #ddd;
}

.btn-google:hover {
    background: #f8f9fa;
}

.btn-facebook {
    background: #1877f2;
    color: white;
}

.btn-facebook:hover {
    background: #166fe5;
}

.btn-zalo {
    background: linear-gradient(135deg, #0068ff, #0180ff);
    color: white;
}

.btn-zalo:hover {
    background: linear-gradient(135deg, #0057d9, #006de5);
}

/* ========== CARDS ========== */
.card {
    background-color: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    border: 1px solid var(--border);
    transition: all var(--transition-base);
}

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

.card-glass {
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.card-compact {
    padding: var(--spacing-md);
}

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

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-main);
    margin: 0;
}

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

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-main);
    font-size: 0.9rem;
}

.form-control {
    width: 100%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    color: var(--text-main);
    font-size: 1rem;
    transition: all var(--transition-base);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

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

/* Floating Label Style */
.form-floating {
    position: relative;
}

.form-floating input {
    padding-top: 1.5rem;
    padding-bottom: 0.5rem;
}

.form-floating label {
    position: absolute;
    top: 0.75rem;
    left: 1rem;
    color: var(--text-muted);
    font-size: 1rem;
    transition: all var(--transition-fast);
    pointer-events: none;
}

.form-floating input:focus~label,
.form-floating input:not(:placeholder-shown)~label {
    top: 0.25rem;
    font-size: 0.75rem;
    color: var(--primary);
}

/* ========== BADGES ========== */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
}

.badge-primary {
    background-color: rgba(59, 130, 246, 0.2);
    color: var(--primary-light);
}

.badge-success {
    background-color: rgba(16, 185, 129, 0.2);
    color: var(--success-light);
}

.badge-warning {
    background-color: rgba(245, 158, 11, 0.2);
    color: var(--warning);
}

.badge-danger {
    background-color: rgba(239, 68, 68, 0.2);
    color: var(--danger);
}

/* ========== UTILITIES ========== */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

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

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

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

.text-primary {
    color: var(--primary);
}

.text-success {
    color: var(--success);
}

.text-danger {
    color: var(--danger);
}

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

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

.bg-panel {
    background-color: var(--bg-panel);
}

.mt-1 {
    margin-top: var(--spacing-sm);
}

.mt-2 {
    margin-top: var(--spacing-md);
}

.mt-3 {
    margin-top: var(--spacing-lg);
}

.mt-4 {
    margin-top: var(--spacing-xl);
}

.mb-1 {
    margin-bottom: var(--spacing-sm);
}

.mb-2 {
    margin-bottom: var(--spacing-md);
}

.mb-3 {
    margin-bottom: var(--spacing-lg);
}

.mb-4 {
    margin-bottom: var(--spacing-xl);
}

.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-sm);
}

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

.gap-3 {
    gap: var(--spacing-lg);
}

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

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* ========== ANIMATIONS ========== */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.animate-fadeIn {
    animation: fadeIn 0.3s ease;
}

.animate-slideUp {
    animation: slideUp 0.4s ease;
}

.animate-slideDown {
    animation: slideDown 0.4s ease;
}

.animate-scaleIn {
    animation: scaleIn 0.3s ease;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    h3 {
        font-size: 1.25rem;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

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

/* ========== LOADING STATES ========== */
.spinner {
    display: inline-block;
    width: 1em;
    height: 1em;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

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

.skeleton {
    background: linear-gradient(90deg, var(--bg-panel) 25%, var(--bg-hover) 50%, var(--bg-panel) 75%);
    background-size: 200% 100%;
    animation: skeleton-loading 1.5s ease-in-out infinite;
    border-radius: var(--radius-md);
}

@keyframes skeleton-loading {
    0% {
        background-position: 200% 0;
    }

    100% {
        background-position: -200% 0;
    }
}

/* ========== DIVIDER ========== */
.divider {
    height: 1px;
    background-color: var(--divider);
    margin: var(--spacing-lg) 0;
}

.divider-vertical {
    width: 1px;
    height: 100%;
    background-color: var(--divider);
    margin: 0 var(--spacing-lg);
}