/* ═══════════════════════════════════════════════════════════
   Tinh Hoa Việt v0.3 – Style System
   Design Philosophy: Organic Modernism × Joyful Children's Energy
   ═══════════════════════════════════════════════════════════ */

/* ─── DESIGN TOKENS ─── */
:root {
   /* Primary Palette */
    --color-primary: #1E88E5; /* Lam (Blue) - Tạo sự tin tưởng, thông minh */
    --color-primary-light: #64B5F6;
    --color-accent: #FFCA28; /* Vàng (Yellow) - Tạo sự năng động, vui tươi */
    --color-accent-light: #FFECB3;
    --color-bg: #F4F9FF; /* Nền xanh nhạt thay cho vàng nâu cũ */
    --color-white: #FFFFFF;
    --color-border: #E3F2FD;
    --color-text: #2C3E50;
    --color-text-muted: #546E7A;

    /* Category Colors (Joyful Palette) */
    --cat-toan: #1E88E5; /* Lam */
    --cat-viet: #FF5252; /* Đỏ (Red) - Kích thích thị giác */
    --cat-combo: #66BB6A; /* Lục (Green) - Thân thiện, an toàn */
    --cat-ky-nang: #AB47BC; /* Tím */
    --cat-viet-chu: #FFCA28; /* Vàng */
    
    /* Joyful Accents */
    --joy-coral: #FF5252;
    --joy-teal: #26C6DA;
    --joy-yellow: #FFCA28;
    --joy-green: #66BB6A;
    --joy-pink: #FF80AB;
    --joy-purple: #BA68C8;

    /* Typography */
    --font-heading: 'Playfair Display', Georgia, serif;
    --font-main: 'Be Vietnam Pro', 'Helvetica Neue', Arial, sans-serif;

    /* Spacing */
    --section-padding: 6rem 0;
    --container-max: 1280px;
    --container-pad: 2rem;

    /* Radii */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    --radius-pill: 100px;

    /* Shadows */
    --shadow-soft: 0 2px 8px rgba(45, 79, 79, 0.08);
    --shadow-md: 0 8px 24px rgba(45, 79, 79, 0.12);
    --shadow-lg: 0 16px 40px rgba(45, 79, 79, 0.16);

    /* Transitions */
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* ─── RESET & BASE ─── */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-main);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    overflow-x: hidden;
}

body.menu-open {
    overflow: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
    padding: 0;
}

/* ─── TYPOGRAPHY ─── */
.h-serif, h1, h2, h3 {
    font-family: var(--font-heading);
    line-height: 1.2;
    font-weight: 700;
}

h1 { font-size: clamp(2.25rem, 5vw, 3.75rem); }
h2 { font-size: clamp(1.75rem, 3.5vw, 2.75rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.5rem); }

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

/* ─── UTILITIES ─── */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-pad);
}

.hidden { display: none !important; }

.section-header {
    text-align: center;
    max-width: 680px;
    margin: 0 auto 4rem;
}

.section-header h2 {
    margin-bottom: 1rem;
    color: var(--color-primary);
}

.section-header p {
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

/* ─── BUTTONS ─── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.75rem;
    border-radius: var(--radius-pill);
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: var(--transition-base);
    text-decoration: none;
    min-height: 48px;
    touch-action: manipulation;
    white-space: nowrap;
}

.btn i { width: 18px; height: 18px; flex-shrink: 0; }

.btn-primary {
    background: var(--color-accent);
    color: var(--color-primary);
    margin-bottom: 0.7cm;
}

.btn-primary:hover {
    background: #d4895e;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-outline:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.btn-sm {
    padding: 0.55rem 1.25rem;
    font-size: 0.9rem;
    min-height: 40px;
}

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

.btn.added {
    background: var(--cat-teal, #4ECDC4);
    color: white;
}

/* ─── ICON BUTTONS ─── */
.icon-btn {
    background: none;
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    transition: var(--transition-base);
    color: var(--color-text-muted);
}

.icon-btn:hover {
    background: var(--color-border);
    color: var(--color-primary);
}

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

.icon-btn.icon-btn-danger:hover {
    background: rgba(255, 107, 107, 0.1); /* Nền đỏ nhạt */
    color: var(--joy-coral); /* #FF6B6B */
}

.icon-btn i { width: 22px; height: 22px; }

/* ═══════════════════════════════════════════════════════════
   HEADER
═══════════════════════════════════════════════════════════ */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 900;
    background: transparent;
    transition: transform 0.3s ease, background 0.3s ease, box-shadow 0.3s ease;
    -webkit-backdrop-filter: blur(0);
    backdrop-filter: blur(0);
}

.main-header.scrolled {
    background: rgba(249, 248, 243, 0.92);
    -webkit-backdrop-filter: blur(16px);
    backdrop-filter: blur(16px);
    box-shadow: var(--shadow-soft);
}

.main-header.header-hidden {
    transform: translateY(-100%);
}

.nav-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
    gap: 2rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.3rem;
    color: var(--color-primary);
    font-weight: 700;
    white-space: nowrap;
}

.logo-icon { width: 28px; height: 28px; }

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex: 1;
    justify-content: center;
}

.nav-links a {
    padding: 0.6rem 1rem;
    border-radius: var(--radius-pill);
    font-weight: 500;
    color: var(--color-text);
    transition: var(--transition-base);
    font-size: 0.95rem;
}

.nav-links a:hover {
    background: rgba(45, 79, 79, 0.08);
    color: var(--color-primary);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Cart Trigger */
.cart-trigger {
    position: relative;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    transition: var(--transition-base);
    color: var(--color-primary);
}

.cart-trigger:hover {
    background: rgba(45, 79, 79, 0.1);
}

.cart-trigger i { width: 24px; height: 24px; }

.cart-badge {
    position: absolute;
    top: 6px;
    right: 6px;
    background: var(--joy-coral);
    color: white;
    font-size: 0.65rem;
    font-weight: 700;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    line-height: 1;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    align-items: center;
    justify-content: center;
    color: var(--color-primary);
    transition: var(--transition-base);
}

.mobile-menu-btn:hover { background: rgba(45,79,79,0.08); }
.mobile-menu-btn i { width: 24px; height: 24px; }

/* ─── MOBILE MENU OVERLAY ─── */
.mobile-menu {
    position: fixed;
    inset: 0;
    background: var(--color-primary);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
}

.mobile-menu.hidden { display: none !important; }

.mobile-menu-close {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: rgba(255,255,255,0.15);
    border: none;
    color: white;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition-base);
}

.mobile-menu-close:hover { background: rgba(255,255,255,0.3); }
.mobile-menu-close i { width: 22px; height: 22px; }

.mobile-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
}

.mobile-nav a {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: white;
    font-size: 1.5rem;
    font-weight: 600;
    padding: 0.75rem 2rem;
    border-radius: var(--radius-pill);
    transition: var(--transition-base);
}

.mobile-nav a:hover { background: rgba(255,255,255,0.15); }
.mobile-nav a i { width: 24px; height: 24px; }
.mobile-nav .btn { background: var(--color-accent); color: var(--color-primary); font-size: 1.1rem; }

/* ═══════════════════════════════════════════════════════════
   HERO SECTION
═══════════════════════════════════════════════════════════ */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: 8rem 0 5rem;
    background: linear-gradient(135deg, var(--color-bg) 0%, #EEF5F5 100%);
}

/* Organic Blobs */
.organic-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}

.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(60px);
    opacity: 0.35;
    animation: blobPulse 8s ease-in-out infinite;
}

.blob-1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, var(--joy-teal), transparent 70%);
    top: -100px; right: -100px;
    animation-delay: 0s;
}

.blob-2 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, var(--color-accent-light), transparent 70%);
    bottom: -50px; left: -80px;
    animation-delay: -3s;
}

.blob-3 {
    width: 300px; height: 300px;
    background: radial-gradient(circle, var(--joy-yellow), transparent 70%);
    top: 40%; right: 30%;
    animation-delay: -6s;
}

@keyframes blobPulse {
    0%, 100% { transform: scale(1) translate(0, 0); }
    33% { transform: scale(1.1) translate(20px, -20px); }
    66% { transform: scale(0.95) translate(-15px, 15px); }
}

.hero-container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 420px;
    align-items: center;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    min-height: 80vh;
}

.hero-content {
    flex: 1;
    max-width: 50%;
}

.hero-image-wrapper {
    flex: 1;
    display: flex;
    justify-content: flex-end;
}

.hero-image {
    max-width: 100%;
    height: auto;
    object-fit: contain;
    /* Có thể thêm animation lơ lửng nhẹ tại đây nếu muốn */
}

.hero-tagline {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(78, 205, 196, 0.15);
    color: var(--color-primary);
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-pill);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    border: 1px solid rgba(78, 205, 196, 0.3);
}

.hero-tagline i { width: 16px; height: 16px; color: var(--joy-teal); }

.hero-title {
    margin-bottom: 1.5rem;
    color: var(--color-primary);
    letter-spacing: -0.02em;
}

.hero-desc {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    margin-bottom: 2.5rem;
    max-width: 480px;
}

.hero-btns {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Hero Waitlist Card */
.hero-waitlist-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
}

.hero-waitlist-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--joy-teal), var(--color-accent), var(--joy-yellow));
}

.hero-waitlist-icon {
    width: 56px; height: 56px;
    background: linear-gradient(135deg, var(--color-accent), var(--joy-yellow));
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 1.25rem;
}

.hero-waitlist-icon i { width: 28px; height: 28px; color: white; }

.hero-waitlist-card h3 {
    font-size: 1.35rem;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

.hero-waitlist-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

.waitlist-form {
    display: flex;
    gap: 0.75rem;
    flex-direction: column;
}

.waitlist-form input[type="email"] {
    width: 100%;
    padding: 0.85rem 1.25rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-pill);
    font-family: var(--font-main);
    font-size: 0.95rem;
    transition: var(--transition-base);
    background: var(--color-bg);
}

.waitlist-form input:focus {
    outline: none;
    border-color: var(--color-accent);
    background: white;
}

.waitlist-msg {
    font-size: 0.9rem;
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    margin-top: 0.5rem;
}

.waitlist-msg.success { background: #EFF9F7; color: #2D7D60; }
.waitlist-msg.error { background: #FFF0F0; color: #CC3333; }

/* ═══════════════════════════════════════════════════════════
   FEATURES SECTION
═══════════════════════════════════════════════════════════ */
.features-section {
    padding: var(--section-padding);
    background: white;
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    padding: 2.5rem 2rem;
    background: var(--color-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: var(--transition-spring);
    text-align: center;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.feature-icon-wrapper {
    width: 72px; height: 72px;
    background: color-mix(in srgb, var(--cat-color, var(--color-accent)) 15%, white);
    color: var(--cat-color, var(--color-accent));
    border-radius: var(--radius-md);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1.5rem;
}

.feature-icon-wrapper i { width: 36px; height: 36px; }

.feature-card h3 {
    color: var(--color-primary);
    margin-bottom: 0.75rem;
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    line-height: 1.65;
}

/* ═══════════════════════════════════════════════════════════
   CATALOG SECTION
═══════════════════════════════════════════════════════════ */
.catalog-section {
    padding: var(--section-padding);
    background: var(--color-bg);
}

.catalog-message {
    text-align: center;
    padding: 3rem;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.catalog-message i { width: 20px; height: 20px; animation: spin 1.5s linear infinite; }

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

.product-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

/* Product Card */
.product-card {
    background: white;
    border-radius: var(--radius-lg);
    overflow: visible !important;
    border: 1px solid var(--color-border);
    transition: var(--transition-base);
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 10;
}

.product-card:hover, 
.product-card:focus-within {
    transform: translateY(-6px);
    box-shadow: var(--shadow-md);
    border-color: transparent;
    z-index: 20;
}

.product-card-link {
    display: block;
    overflow: hidden;
}

.product-img-wrapper {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4/3;
    background: var(--color-bg);
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.book-cover-front {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: left center;
    transition: transform 0.4s ease;
}

.product-card:hover .book-cover-front {
    transform: scale(1.04);
}

.discount-badge {
    position: absolute;
    top: 12px; right: 12px;
    background: var(--joy-coral);
    color: white;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-pill);
}

.product-info {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    flex: 1;
}

.product-category {
    display: inline-flex;
    align-items: center;
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-pill);
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    align-self: flex-start;
}

/* Category Colors */
.cat-toán { background: rgba(78,205,196,0.15); color: #2A8F89; }
.cat-tiếng-việt { background: rgba(255,107,107,0.15); color: #CC3333; }
.cat-combo { background: rgba(168,230,207,0.2); color: #2D7D60; }
.cat-kỹ-năng { background: rgba(195,177,225,0.2); color: #6B4FA0; }
.cat-default { background: rgba(232,159,113,0.15); color: #B5651D; }

.product-title {
    font-size: 1rem;
    font-family: var(--font-main);
    font-weight: 600;
    color: var(--color-primary);
    line-height: 1.4;
}

.product-title a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s;
}

.product-title a:hover { color: var(--color-accent); }

/* Price Row */
.product-price-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-wrap: wrap;
    position: relative;
}

.price-cover {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-decoration: line-through;
}

.price-cover del {
    text-decoration: line-through;
    margin-right: 4px;
}

.price-discount-inline {
    color: #e02424;
    font-weight: 700;
}

.price-main {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
}

.tier-info-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.2rem;
    border-radius: 50%;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    transition: var(--transition-base);
    touch-action: manipulation;
}

.tier-info-btn:hover { color: var(--color-accent); }
.tier-info-btn i { width: 16px; height: 16px; }

/* Tier Tooltip */
.tier-tooltip {
    position: absolute;
    bottom: calc(100% + 10px);
    left: 0;
    background: white;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    z-index: 9990;
    min-width: 260px;
    font-size: 0.875rem;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.2s ease;
    pointer-events: none;
}

.tier-tooltip::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 20px;
    border-width: 6px;
    border-style: solid;
    border-color: white transparent transparent transparent;
}

.tier-info-btn:hover + .tier-tooltip,
.tier-tooltip:hover {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
}

.tier-tooltip-header {
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
}

.tier-table {
    width: 100%;
    border-collapse: collapse;
}

.tier-table th, .tier-table td {
    padding: 0.4rem 0.5rem;
    text-align: left;
    font-size: 0.82rem;
}

.tier-table th {
    color: var(--color-text-muted);
    font-weight: 600;
    border-bottom: 1px solid var(--color-border);
}

.tier-price {
    font-weight: 700;
    color: var(--joy-coral);
}

/* Price Preview */
.price-preview {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.price-preview-value {
    font-weight: 700;
    color: var(--color-primary);
}

/* Quantity Controls */
.qty-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-pill);
    padding: 0.25rem 0.5rem;
    width: fit-content;
}

.qty-btn {
    background: none;
    border: none;
    cursor: pointer;
    width: 32px; height: 32px;
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    color: var(--color-primary);
    transition: var(--transition-base);
    touch-action: manipulation;
}

.qty-btn:hover:not(:disabled) { background: var(--color-bg); }
.qty-btn:disabled { opacity: 0.3; cursor: not-allowed; }
.qty-btn i { width: 16px; height: 16px; }

.qty-input {
    width: 48px;
    text-align: center;
    border: none;
    background: none;
    font-family: var(--font-main);
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    -moz-appearance: textfield;
}

.qty-input::-webkit-inner-spin-button,
.qty-input::-webkit-outer-spin-button { -webkit-appearance: none; }

.add-to-cart-btn {
    width: 100%;
    justify-content: center;
    margin-top: auto;
}

/* Explore CTA */
.explore-cta {
    background: white;
    border-radius: var(--radius-xl);
    border: 2px dashed var(--color-border);
    padding: 3rem 2rem;
    display: flex;
    justify-content: center;
}

.explore-cta-content {
    display: flex;
    align-items: center;
    gap: 2rem;
    max-width: 700px;
    text-align: left;
}

.explore-cta-content > i {
    width: 56px; height: 56px;
    color: var(--color-accent);
    flex-shrink: 0;
}

.explore-cta-content h3 { margin-bottom: 0.3rem; color: var(--color-primary); }
.explore-cta-content p { color: var(--color-text-muted); font-size: 0.95rem; }

/* ═══════════════════════════════════════════════════════════
   REVIEWS / SOCIAL PROOF
═══════════════════════════════════════════════════════════ */
.reviews-section {
    padding: var(--section-padding);
    background: linear-gradient(135deg, #EEF5F5 0%, #F9F8F3 100%);
}

/* Trust Stats Bar */
.trust-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    background: white;
    border-radius: var(--radius-xl);
    padding: 2rem 3rem;
    margin-bottom: 4rem;
    box-shadow: var(--shadow-soft);
    flex-wrap: wrap;
}

.trust-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.4rem;
    text-align: center;
}

.trust-stat i { width: 28px; height: 28px; color: var(--color-accent); }

.trust-stat strong {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.trust-stat span {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

/* Reviews Grid */
.reviews-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.review-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-soft);
    border: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    transition: var(--transition-base);
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.review-card-featured {
    background: var(--color-primary);
    border-color: transparent;
    color: white;
}

.review-card-featured blockquote { color: rgba(255,255,255,0.85); }
.review-card-featured .reviewer-info strong { color: white; }
.review-card-featured .reviewer-info span { color: rgba(255,255,255,0.6); }
.review-card-featured .review-stars { color: var(--joy-yellow); }

/* Star Rating */
.review-stars {
    display: flex;
    gap: 0.2rem;
    color: var(--joy-yellow);
}

.review-stars i { width: 18px; height: 18px; fill: currentColor; }

.review-text {
    font-style: italic;
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-text);
    flex: 1;
}

.reviewer {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.reviewer-avatar {
    width: 44px; height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-accent), var(--joy-teal));
    color: white;
    font-weight: 700;
    font-size: 0.85rem;
    display: flex; align-items: center; justify-content: center;
    flex-shrink: 0;
}

.reviewer-info strong {
    display: block;
    font-size: 0.95rem;
    color: var(--color-primary);
}

.reviewer-info span {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

/* ═══════════════════════════════════════════════════════════
   WAITLIST SECTION
═══════════════════════════════════════════════════════════ */
.waitlist-section {
    padding: var(--section-padding);
    background: var(--color-bg);
}

.waitlist-card {
    background: var(--color-primary);
    color: white;
    border-radius: var(--radius-xl);
    padding: 4rem 3rem;
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.waitlist-card::after {
    content: '';
    position: absolute;
    bottom: -60px; right: -60px;
    width: 200px; height: 200px;
    border-radius: 50%;
    background: rgba(255,255,255,0.05);
}

.waitlist-icon {
    width: 72px; height: 72px;
    background: rgba(255,255,255,0.15);
    border-radius: var(--radius-lg);
    display: flex; align-items: center; justify-content: center;
    margin: 0 auto 1.5rem;
}

.waitlist-icon i { width: 36px; height: 36px; color: var(--color-accent); }

.waitlist-card .h-serif {
    color: var(--color-accent);
    font-size: clamp(1.5rem, 3vw, 2.2rem);
    margin-bottom: 1rem;
}

.waitlist-card p {
    color: rgba(255,255,255,0.8);
    max-width: 500px;
    margin: 0 auto 2rem;
}

.waitlist-features {
    display: flex;
    flex-direction: column;
    gap: 0.6rem;
    align-items: center;
    margin-bottom: 2rem;
}

.waitlist-features span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: rgba(255,255,255,0.85);
}

.waitlist-features i { width: 16px; height: 16px; color: var(--joy-teal); }

/* ═══════════════════════════════════════════════════════════
   FOOTER
═══════════════════════════════════════════════════════════ */
.main-footer {
    background: var(--color-primary);
    color: white;
    padding-top: 5rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1.5fr;
    gap: 4rem;
    padding-bottom: 4rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo {
    font-size: 1.3rem;
    color: white;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.footer-brand p {
    color: rgba(255,255,255,0.65);
    font-size: 0.9rem;
    margin-bottom: 2rem;
    line-height: 1.7;
}

.social-links {
    display: flex;
    gap: 0.75rem;
}

.social-links a {
    width: 44px; height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.1);
    display: flex; align-items: center; justify-content: center;
    color: white;
    transition: var(--transition-base);
}

.social-links a:hover {
    background: var(--color-accent);
    transform: translateY(-3px);
}

.social-links i { width: 18px; height: 18px; }

.footer-links h4, .footer-contact h4 {
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 1.25rem;
    color: rgba(255,255,255,0.9);
    text-transform: uppercase;
    letter-spacing: 0.08em;
    font-family: var(--font-main);
}

.footer-links ul, .footer-contact ul {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.footer-links a {
    color: rgba(255,255,255,0.65);
    font-size: 0.9rem;
    transition: var(--transition-base);
}

.footer-links a:hover {
    color: var(--color-accent);
    padding-left: 4px;
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    color: rgba(255,255,255,0.65);
    font-size: 0.9rem;
    line-height: 1.5;
}

.footer-contact i { width: 18px; height: 18px; color: var(--color-accent); flex-shrink: 0; margin-top: 2px; }

.footer-bottom {
    padding: 1.5rem 0;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

/* ═══════════════════════════════════════════════════════════
   CART DRAWER
═══════════════════════════════════════════════════════════ */
.cart-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.45);
    -webkit-backdrop-filter: blur(4px);
    backdrop-filter: blur(4px);
    z-index: 950;
    transition: opacity 0.3s ease;
}

.cart-drawer {
    position: fixed;
    top: 0; right: 0;
    width: 100%;
    max-width: 420px;
    height: 100vh;
    background: white;
    z-index: 960;
    display: flex;
    flex-direction: column;
    box-shadow: -10px 0 40px rgba(0,0,0,0.12);
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.cart-drawer.open { transform: translateX(0); }

.cart-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--color-bg);
}

.cart-header h2 {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    font-size: 1.15rem;
    color: var(--color-primary);
    font-family: var(--font-main);
}

.cart-header h2 i { width: 20px; height: 20px; }

.cart-items {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Empty Cart State */
.cart-empty {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    padding: 3rem;
    color: var(--color-text-muted);
    text-align: center;
    height: 100%;
}

.cart-empty i { width: 48px; height: 48px; opacity: 0.3; }
.cart-empty p { font-weight: 600; }
.cart-empty small { font-size: 0.85rem; }

/* Cart Item */
.cart-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 1rem;
    background: var(--color-bg);
}

.cart-item-body {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.cart-item-title {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--color-primary);
    line-height: 1.4;
}

.cart-item-unit-price {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

.cart-item-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-pill);
    padding: 0.15rem 0.4rem;
    flex-shrink: 0;
}

.cart-qty {
    min-width: 28px;
    text-align: center;
    font-weight: 700;
    font-size: 0.95rem;
    color: var(--color-primary);
}

.cart-item-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.cart-line-total {
    font-weight: 700;
    font-size: 1rem;
    color: var(--color-primary);
}

.cart-remove {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    padding: 0.25rem;
    border-radius: var(--radius-sm);
    transition: var(--transition-base);
}

.cart-remove:hover { color: var(--joy-coral); background: rgba(255,107,107,0.1); }
.cart-remove i { width: 16px; height: 16px; }

.cart-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--color-border);
    background: var(--color-bg);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.cart-total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-primary);
}

.cart-disclaimer {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.78rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

.cart-disclaimer i { width: 14px; height: 14px; flex-shrink: 0; margin-top: 2px; }

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

/* ═══════════════════════════════════════════════════════════
   CHECKOUT MODAL
═══════════════════════════════════════════════════════════ */
#checkout-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 9999;
    transition: opacity 0.3s ease;
}

#checkout-overlay.hidden {
    opacity: 0;
    pointer-events: none;
}

#checkout-modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 90%;
    max-width: 450px;
    background: #ffffff;
    border-radius: var(--radius-lg, 12px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    z-index: 10000;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#checkout-modal.hidden {
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, -45%);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg);
}

.modal-header h3 {
    margin: 0;
    font-size: 1.15rem;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.close-btn {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.2s, color 0.2s;
}

.close-btn:hover {
    background-color: rgba(0,0,0,0.05);
    color: var(--color-text);
}

.text-hint { font-size: 0.9rem; color: #6B7280; margin-bottom: 16px; }

/* Clean Textarea */
.clean-textarea {
    min-height: 280px;
    width: 100%;
    padding: 16px;
    background: #F3F4F6;
    border: 1px solid transparent;
    border-radius: 16px;
    font-family: inherit;
    font-size: 0.95rem;
    color: #1F2937;
    line-height: 1.6;
    resize: none;
    transition: all 0.2s;
    margin-bottom: 8px;
}
.clean-textarea:focus {
    background: #fff;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 4px rgba(45, 79, 79, 0.1);
    outline: none;
}

/* Action Buttons */
.btn-ghost {
    background: transparent; border: none;
    color: var(--color-primary); font-weight: 600;
    width: 100%; padding: 12px; margin-bottom: 16px;
    border-radius: 12px; cursor: pointer;
    display: flex; align-items: center; justify-content: center; gap: 8px;
}
.btn-ghost:hover { background: #F3F4F6; }

.checkout-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.btn-zalo, .btn-mess {
    padding: 14px; border: none; border-radius: 14px;
    font-weight: 600; font-size: 0.95rem; cursor: pointer;
    color: #fff; transition: transform 0.1s;
}
.btn-zalo { background: #0068FF; }
.btn-mess { background: #00B2FF; }
.btn-zalo:active, .btn-mess:active { transform: scale(0.96); }

.modal-body {
    padding: 1.5rem;
}

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

.mb-3 {
    margin-bottom: 0.75rem;
}

#ch-summary-text {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    transition: border-color 0.2s, box-shadow 0.2s;
}

#ch-summary-text:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(45, 79, 79, 0.1);
    background-color: #ffffff;
}



@media (max-width: 600px) {
    #checkout-modal {
        top: auto;
        bottom: 0;
        left: 0;
        transform: translateY(0);
        width: 100%;
        max-width: 100%;
        border-radius: 20px 20px 0 0;
        padding-bottom: env(safe-area-inset-bottom, 20px);
    }

    #checkout-modal.hidden {
        transform: translateY(100%);
    }
    
    .modal-body {
        padding: 1.25rem;
    }
    
    .checkout-actions .btn {
        padding: 14px 16px;
        font-size: 1rem;
        font-weight: 600;
    }
    
    #ch-summary-text {
        font-size: 16px; 
    }
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════════════════════════ */

/* Tablet */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        max-width: 600px;
        margin: 0 auto;
        text-align: center;
    }

    .hero-content { max-width: 100%; }
    .hero-desc { margin: 0 auto 2rem; }
    .hero-btns { justify-content: center; }
    .hero-tagline { display: inline-flex; }

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

    .explore-cta-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-grid { grid-template-columns: 1fr; gap: 2.5rem; }
    .trust-stats { gap: 2rem; }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --section-padding: 4rem 0;
        --container-pad: 1.25rem;
    }

    .nav-links { display: none; }
    .mobile-menu-btn { display: flex; }

    .hero-section { padding: 6rem 0 4rem; min-height: auto; }

    .hero-container {
        flex-direction: column;
        text-align: center;
        padding-top: 100px;
    }
    .hero-content { max-width: 100%; }
    .hero-image-wrapper { justify-content: center; }

    .feature-grid { grid-template-columns: 1fr; }

    .feature-card {
        width: 300px;
        flex-shrink: 0;
        display: flex;
        flex-direction: row;
        align-items: flex-start;
        gap: 1.25rem;
        text-align: left;
    }

    .feature-icon-wrapper {
        margin: 0;
        flex-shrink: 0;
        width: 56px; height: 56px;
    }

    .feature-icon-wrapper i { width: 28px; height: 28px; }

    .product-grid { grid-template-columns: 1fr; gap: 1.25rem; }

    .product-img-wrapper { aspect-ratio: 16/9; }

    .reviews-grid {
        display: flex;
        overflow-x: auto;
        scroll-snap-type: x mandatory;
        gap: 1rem;
        padding-bottom: 1rem;
        -webkit-overflow-scrolling: touch;
    }

    .review-card {
        min-width: 300px;
        scroll-snap-align: start;
        flex-shrink: 0;
    }

    .trust-stats {
        gap: 1.5rem;
        padding: 1.5rem;
        grid-template-columns: repeat(2, 1fr);
        display: grid;
    }

    .waitlist-card { padding: 2.5rem 1.5rem; }

    .footer-grid { grid-template-columns: 1fr; gap: 2rem; }

    /* Full-width cart on small screens */
    .cart-drawer { max-width: 100vw; }

    .explore-cta { padding: 2rem 1.5rem; }
    .explore-cta-content { flex-direction: column; text-align: center; gap: 1.25rem; }
    .explore-cta-content > i { display: none; }

    /* Hero waitlist stacks in single column */
    .waitlist-form { flex-direction: column; }
}

/* Focus Visible (Accessibility) */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
    border-radius: 4px;
}