/* 
   ==========================================================================
   MINH HOANG BDS - DESIGN SYSTEM & COMPONENT LIBRARY
   Version: 2.0 (Architecture First)
   ========================================================================== 
*/

/* 1. DESIGN TOKEN SYSTEM */
:root {
    /* Color Tokens - Primitives */
    --c-black-900: #0B0C10;
    --c-black-800: #151821;
    --c-black-700: #1c202b;
    --c-gold-500: #dfba6b;
    --c-gold-600: #b89345;
    --c-gold-100: rgba(223, 186, 107, 0.15);
    --c-white: #ffffff;
    --c-gray-400: #a0aabf;
    --c-gray-500: #6b7280;
    
    /* Color Tokens - Semantic */
    --lx-bg-main: var(--c-black-900);           
    --lx-bg-card: var(--c-black-800);           
    --lx-bg-card-hover: var(--c-black-700);
    --lx-bg-glass: rgba(21, 24, 33, 0.7);
    --lx-bg-light: #f8f9fa; /* Cho section Light Theme */
    
    --lx-primary: var(--c-gold-500);      
    --lx-primary-hover: var(--c-gold-600);         
    --lx-primary-dim: var(--c-gold-100); 
    
    --lx-text-main: var(--c-white);
    --lx-text-muted: var(--c-gray-400);        
    --lx-text-dark: var(--c-black-900); /* Chữ tối cho nền sáng */
    
    --lx-border-primary: rgba(223, 186, 107, 0.2); 
    --lx-border-light: rgba(255, 255, 255, 0.1);
    --lx-border-dark: rgba(0, 0, 0, 0.1);

    /* Typography Tokens */
    --lx-font-serif: 'Playfair Display', serif; 
    --lx-font-sans: 'Inter', sans-serif;        
    
    /* Spacing Tokens */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;
    
    /* Section Padding Tokens */
    --section-pad-y: var(--space-4xl);

    /* Border Radius Tokens */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-round: 50px;

    /* Z-Index Tokens */
    --z-negative: -1;
    --z-elevate: 10;
    --z-sticky: 100;
    --z-modal-backdrop: 900;
    --z-modal: 1000;
    --z-toast: 2000;
}

/* ==========================================================================
   GLOBAL RESET & UTILITIES
   ========================================================================== */
body {
    background-color: var(--lx-bg-main);
    color: var(--lx-text-main);
    font-family: var(--lx-font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Section Variants (Dark/Light alternating) */
.lx-section {
    padding: var(--section-pad-y) 0;
    position: relative;
}
.lx-section-dark {
    background-color: var(--lx-bg-main);
    color: var(--lx-text-main);
}
.lx-section-light {
    background-color: var(--lx-bg-light);
    color: var(--lx-text-dark);
}
.lx-section-light .lx-text-muted {
    color: var(--c-gray-500);
}
.lx-section-light .lx-title {
    color: var(--lx-text-dark);
}
.lx-section-light .lx-title-gold {
    color: var(--lx-primary-hover);
}

h1, h2, h3, h4, h5, h6, .lx-title {
    font-family: var(--lx-font-serif);
    font-weight: 600;
    margin-top: 0;
}
.lx-title-gold {
    color: var(--lx-primary);
}

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

/* ==========================================================================
   COMPONENT: BUTTONS (Variant Component)
   ========================================================================== */
.lx-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 12px 28px;
    border-radius: var(--radius-round);
    font-family: var(--lx-font-sans);
    font-weight: 600;
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 1px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    text-decoration: none;
    border: none;
    position: relative;
    overflow: hidden;
}

/* Variant: Primary */
.lx-btn-primary {
    background: linear-gradient(135deg, var(--lx-primary) 0%, var(--lx-primary-hover) 100%);
    color: var(--c-black-900);
    box-shadow: 0 4px 15px rgba(223, 186, 107, 0.3);
}
.lx-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(223, 186, 107, 0.5);
    color: var(--c-black-900);
}

/* Variant: Outline */
.lx-btn-outline {
    background: transparent;
    color: var(--lx-primary);
    border: 1px solid var(--lx-primary);
}
.lx-btn-outline:hover {
    background: var(--lx-primary-dim);
    color: var(--lx-primary);
}
.lx-section-light .lx-btn-outline {
    border-color: var(--lx-primary-hover);
    color: var(--lx-primary-hover);
}

/* Variant: Block */
.lx-btn-block {
    width: 100%;
}

/* ==========================================================================
   COMPONENT: CARDS & BADGES
   ========================================================================== */
.lx-card {
    background: var(--lx-bg-card);
    border: 1px solid var(--lx-border-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.lx-section-light .lx-card {
    background: var(--c-white);
    border-color: var(--lx-border-dark);
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}
.lx-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}

.lx-card-glass {
    background: var(--lx-bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--lx-border-primary);
    border-radius: var(--radius-lg);
}

.lx-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: var(--radius-round);
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.lx-badge-gold {
    background: var(--lx-primary-dim);
    color: var(--lx-primary);
    border: 1px solid var(--lx-primary);
}
.lx-section-light .lx-badge-gold {
    background: rgba(184, 147, 69, 0.1);
    color: var(--lx-primary-hover);
    border-color: var(--lx-primary-hover);
}

/* ==========================================================================
   COMPONENT: FORMS
   ========================================================================== */
.lx-form-group {
    margin-bottom: var(--space-md);
    position: relative;
}
.lx-input {
    width: 100%;
    padding: 14px 16px;
    background: rgba(0,0,0,0.3);
    border: 1px solid var(--lx-border-light);
    border-radius: var(--radius-md);
    color: var(--lx-text-main);
    font-family: var(--lx-font-sans);
    font-size: 15px;
    transition: all 0.3s ease;
}
.lx-section-light .lx-input {
    background: var(--c-white);
    border-color: #e5e7eb;
    color: var(--lx-text-dark);
}
.lx-input:focus {
    border-color: var(--lx-primary);
    background: rgba(0,0,0,0.5);
    outline: none;
    box-shadow: 0 0 0 3px var(--lx-primary-dim);
}
.lx-section-light .lx-input:focus {
    background: var(--c-white);
}

/* ==========================================================================
   ANIMATION SYSTEM (Nhẹ)
   ========================================================================== */
/* 1. Fade Up */
@keyframes lx-fade-up {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
.anim-fade-up {
    opacity: 0;
    animation: lx-fade-up 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Delay Utils */
.anim-d-100 { animation-delay: 100ms; }
.anim-d-200 { animation-delay: 200ms; }
.anim-d-300 { animation-delay: 300ms; }
.anim-d-400 { animation-delay: 400ms; }

/* 2. Parallax Setup */
.parallax-bg {
    background-attachment: fixed;
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
}

/* ==========================================================================
   SKELETON LOADING SYSTEM
   ========================================================================== */
@keyframes lx-skeleton-shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}
.skeleton {
    background: #2a2d38;
    background-image: linear-gradient(90deg, #2a2d38 0px, #3b3f4f 40px, #2a2d38 80px);
    background-size: 1000px 100%;
    animation: lx-skeleton-shimmer 2s infinite linear;
    border-radius: var(--radius-sm);
}
.lx-section-light .skeleton {
    background: #e2e8f0;
    background-image: linear-gradient(90deg, #e2e8f0 0px, #f1f5f9 40px, #e2e8f0 80px);
}
.skeleton-text {
    height: 14px;
    margin-bottom: 8px;
    width: 100%;
}
.skeleton-text.short { width: 60%; }
.skeleton-img {
    height: 200px;
    width: 100%;
}

/* ==========================================================================
   LAYOUT UTILITIES
   ========================================================================== */
.lx-grid { display: grid; gap: var(--space-xl); }
.lx-grid-2 { grid-template-columns: repeat(2, 1fr); }
.lx-grid-3 { grid-template-columns: repeat(3, 1fr); }
.lx-grid-4 { grid-template-columns: repeat(4, 1fr); }

/* Responsive Rules */
@media (max-width: 991px) {
    .lx-grid-3, .lx-grid-4 { grid-template-columns: repeat(2, 1fr); }
    --section-pad-y: var(--space-3xl);
}

@media (max-width: 767px) {
    .lx-grid-2, .lx-grid-3, .lx-grid-4 { grid-template-columns: 1fr; }
    --section-pad-y: var(--space-2xl);
    h1, .h1 { font-size: 2.5rem !important; }
    h2, .h2 { font-size: 2rem !important; }
}