/* -------------------------------------------------------------------------
   1. CSS VARIABLES & THEME SETTINGS
   ------------------------------------------------------------------------- */
:root {
    /* Color Palette - Premium & Elegant */
    --color-primary-dark: #121212;
    /* Deep Charcoal Black */
    --color-primary-light: #F8F9FA;
    /* Pristine White */
    --color-emerald: #0A634B;
    /* Elegant Emerald Green */
    --color-gold: #D4AF37;
    /* Muted Metallic Gold */
    --color-gold-hover: #b59228;
    --color-taupe: #B3A090;
    /* Sophisticated Taupe */

    /* Grays & Neutrals */
    --color-gray-50: #fafafa;
    --color-gray-100: #f5f5f5;
    --color-gray-200: #eeeeee;
    --color-gray-300: #e0e0e0;
    --color-gray-400: #bdbdbd;
    --color-gray-500: #9e9e9e;
    --color-gray-600: #757575;
    --color-gray-700: #616161;
    --color-gray-800: #424242;
    --color-gray-900: #212121;

    /* Typographic Settings */
    /* Sans-serif cho body text - hiện đại, sạch sẽ */
    --font-family-base: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    /* Serif cho Heading - sang trọng, cổ điển, thời trang cao cấp */
    --font-family-heading: 'Playfair Display', serif;

    /* Spacing System */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 5rem;
    --spacing-5xl: 6rem;
    --spacing-section: 6rem 0;

    /* Shadows System - Pro Max */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --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-glass: 0 8px 32px 0 rgba(0, 0, 0, 0.07);
    --shadow-glass-dark: 0 8px 32px 0 rgba(31, 38, 135, 0.37);

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Glassmorphism settings */
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-bg-dark: rgba(18, 18, 18, 0.6);
    --glass-border: 1px solid rgba(255, 255, 255, 0.18);
    --glass-border-dark: 1px solid rgba(255, 255, 255, 0.05);
    --glass-blur: blur(16px);
    --glass-blur-heavy: blur(24px);

    /* Transitions */
    --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-elastic: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Z-index layers */
    --z-negative: -1;
    --z-normal: 1;
    --z-tooltip: 10;
    --z-fixed: 100;
    --z-navbar: 500;
    --z-modal: 1000;
    --z-toast: 2000;
}

/* -------------------------------------------------------------------------
   2. CSS RESET & NORMALIZE
   ------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    background-color: var(--color-primary-light);
    color: var(--color-primary-dark);
    font-family: var(--font-family-base);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gold);
}

/* Focus Outline */
:focus {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-gold);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background-color: var(--color-gold);
    color: #fff;
    text-shadow: none;
}

::-moz-selection {
    background-color: var(--color-gold);
    color: #fff;
    text-shadow: none;
}

/* -------------------------------------------------------------------------
   3. TYPOGRAPHY
   ------------------------------------------------------------------------- */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-family-heading);
    font-weight: 600;
    color: var(--color-primary-dark);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.main-title {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    letter-spacing: -0.03em;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, #111 0%, #444 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    font-size: clamp(1.5rem, 3.5vw, 2.75rem);
    position: relative;
    padding-bottom: var(--spacing-sm);
}

/* Dấu gạch dính kèm H2 kiểu sang trọng */
h2::after {
    content: '';
    display: block;
    width: 60px;
    height: 2px;
    background: var(--color-gold);
    margin-top: var(--spacing-md);
}

h3 {
    font-size: clamp(1.3rem, 2.5vw, 2rem);
}

h4 {
    font-size: clamp(1.1rem, 2vw, 1.5rem);
}

p {
    margin-bottom: var(--spacing-md);
    font-size: 1.05rem;
    color: var(--color-gray-700);
}

.subtitle {
    font-size: clamp(1.1rem, 1.5vw, 1.25rem);
    color: var(--color-gray-600);
    line-height: 1.8;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--color-gold);
}

/* -------------------------------------------------------------------------
   4. LAYOUT UTILITIES
   ------------------------------------------------------------------------- */
.content-container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.content-wide {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

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

.text-center h2::after {
    margin-left: auto;
    margin-right: auto;
}

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

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

.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);
}

.pt-1 {
    padding-top: var(--spacing-sm);
}

.pt-2 {
    padding-top: var(--spacing-md);
}

.pb-1 {
    padding-bottom: var(--spacing-sm);
}

.pb-2 {
    padding-bottom: var(--spacing-md);
}

/* Màu sắc nền phụ trợ dùng linear-gradient để đúng luật cấm background-image từ urls (vì url(...) là cấm) */
.bg-light-gray {
    background: linear-gradient(to bottom, var(--color-gray-50), var(--color-gray-100));
}

.bg-dark {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, #2a2a2a 100%);
    color: var(--color-primary-light);
}

.bg-dark h2,
.bg-dark h3,
.bg-dark h4 {
    color: var(--color-primary-light);
}

.text-light {
    color: var(--color-gray-300);
}

.text-light p {
    color: var(--color-gray-300);
}

/* -------------------------------------------------------------------------
   5. GLASSMORPHISM UTILITIES
   ------------------------------------------------------------------------- */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    /* Safari */
    border: var(--glass-border);
    box-shadow: var(--shadow-glass);
    border-radius: var(--radius-lg);
}

.glass-panel-dark {
    background: var(--glass-bg-dark);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    /* Safari */
    border: var(--glass-border-dark);
    box-shadow: var(--shadow-glass-dark);
    border-radius: var(--radius-lg);
}

/* -------------------------------------------------------------------------
   6. ANIMATIONS & KEYFRAMES (PRO MAX)
   ------------------------------------------------------------------------- */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

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

@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-40px);
    }

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(40px);
    }

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

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }

    100% {
        transform: translateY(0px);
    }
}

@keyframes pulseSoft {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.03);
    }

    100% {
        transform: scale(1);
    }
}

@keyframes pulseShadow {
    0% {
        box-shadow: 0 0 0 0 rgba(212, 175, 55, 0.4);
    }

    70% {
        box-shadow: 0 0 0 15px rgba(212, 175, 55, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(212, 175, 55, 0);
    }
}

@keyframes gradientShift {
    0% {
        background-position: 0% 50%;
    }

    50% {
        background-position: 100% 50%;
    }

    100% {
        background-position: 0% 50%;
    }
}

@keyframes spinSlow {
    from {
        transform: rotate(0deg);
    }

    to {
        transform: rotate(360deg);
    }
}

@keyframes slideDown {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }

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

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }

    100% {
        background-position: 1000px 0;
    }
}

/* Utility Class For Animation */
.animate-fade-in {
    animation: fadeIn 1s ease forwards;
}

.animate-fade-in-up {
    animation: fadeInUp 1s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
}

.animate-float {
    animation: float 6s ease-in-out infinite;
}

.animate-slide-down {
    animation: slideDown 0.5s ease forwards;
}

/* Thêm vào thẻ được nhìn thấy (Simulation cho Scroll Reveal nếu dùng js, nhưng ở đây ta để state ban đầu) */
section {
    animation: fadeIn 1.2s ease forwards;
}

/* -------------------------------------------------------------------------
   7. NAVBAR (HEADER) MODULE
   ------------------------------------------------------------------------- */
.navbar-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-navbar);
    /* Glassmorphism Header */
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: var(--glass-border);
    box-shadow: var(--shadow-sm);
    transition: padding var(--transition-base), background var(--transition-base);
    padding: var(--spacing-sm) 0;
}

.navbar-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.navbar-logo {
    display: flex;
    align-items: center;
    justify-content: center;
}

.brand-logo {
    height: 50px;
    width: auto;
    object-fit: contain;
    transition: transform var(--transition-elastic);
}

.brand-logo:hover {
    transform: scale(1.05);
}

.navbar-menu {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
    margin: 0;
    padding: 0;
}

.nav-list li {
    position: relative;
}

.nav-list a {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-primary-dark);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: var(--spacing-xs) 0;
    display: inline-block;
    position: relative;
    overflow: hidden;
}

/* Xoá hiệu ứng cũ của a:hover để dùng hiệu ứng vạch kẻ tinh tế */
.nav-list a:hover {
    color: var(--color-primary-dark);
}

.nav-list a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--color-gold);
    transform: translateX(-101%);
    transition: transform var(--transition-base);
}

.nav-list a:hover::after {
    transform: translateX(0);
}

/* Nút Hamburger menu (Mobile) */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    cursor: pointer;
    z-index: calc(var(--z-navbar) + 1);
}

.mobile-menu-toggle span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary-dark);
    transition: all var(--transition-base);
    transform-origin: left center;
}

/* Hamburger active animation */
.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(10px);
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg);
}

/* -------------------------------------------------------------------------
   8. COMPONENT: IMAGES & RADIUS
   ------------------------------------------------------------------------- */
.responsive-img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.img-radius {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* Setup hover zoom image */
.image-overflow-helper {
    overflow: hidden;
    border-radius: var(--radius-lg);
}

/* -------------------------------------------------------------------------
   9. SECTION LAYOUTS (CẤU TRÚC PHẦN TỬ)
   ------------------------------------------------------------------------- */
section {
    padding: var(--spacing-section);
    position: relative;
    /* Dành chỗ cho header cố định */
    scroll-margin-top: 90px;
}

.alternate-layout {
    display: flex;
    align-items: center;
    gap: var(--spacing-5xl);
}

.alternate-layout-reverse {
    display: flex;
    align-items: center;
    flex-direction: row-reverse;
    gap: var(--spacing-5xl);
}

.alternate-layout>*,
.alternate-layout-reverse>* {
    flex: 1;
}

/* -------------------------------------------------------------------------
   10. HERO SECTION CUSTOM
   ------------------------------------------------------------------------- */
.hero-section {
    padding-top: 140px;
    /* bù navbar */
    padding-bottom: var(--spacing-3xl);
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(120deg, #ffffff 0%, #f0f3f5 100%);
    position: relative;
    overflow: hidden;
}

/* Vòng tròn gradient ánh sáng phía sau */
.hero-section::before {
    content: '';
    position: absolute;
    top: -20%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.15) 0%, rgba(255, 255, 255, 0) 70%);
    border-radius: 50%;
    z-index: var(--z-negative);
    animation: float 10s ease-in-out infinite alternate;
}

.hero-text {
    animation: fadeInLeft 1s ease forwards;
    padding-right: var(--spacing-xl);
}

.hero-image {
    animation: fadeInRight 1s ease forwards;
    position: relative;
}

/* Lớp phủ mờ nhỏ bên dưới ảnh */
.hero-image::after {
    content: '';
    position: absolute;
    bottom: -20px;
    left: 10%;
    width: 80%;
    height: 20px;
    background: radial-gradient(ellipse at center, rgba(0, 0, 0, 0.2) 0%, rgba(0, 0, 0, 0) 70%);
    border-radius: 50%;
}

.hero-image:hover .responsive-img {
    transform: scale(1.02);
}

/* -------------------------------------------------------------------------
   11. COLLABORATION BOX (FORM SCHEMA)
   ------------------------------------------------------------------------- */
.collaboration-box {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur-heavy);
    -webkit-backdrop-filter: var(--glass-blur-heavy);
    border: var(--glass-border);
    box-shadow: var(--shadow-glass);
    border-radius: var(--radius-lg);
    position: relative;
    z-index: 2;
    overflow: hidden;
}

/* Shimmer Effect góc viền */
.collaboration-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--color-gold), transparent);
    background-size: 200% auto;
    animation: shimmer 3s linear infinite;
}

.collab-text {
    font-size: 0.95rem;
    color: var(--color-gray-700);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

.collab-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-md);
    font-family: var(--font-family-base);
    font-size: 1rem;
    color: var(--color-primary-dark);
    background: rgba(255, 255, 255, 0.9);
    transition: all var(--transition-base);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-input:focus,
.form-textarea:focus {
    border-color: var(--color-gold);
    box-shadow: 0 0 0 4px rgba(212, 175, 55, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--color-gray-500);
}

/* Button UI/UX Pro Max */
.form-btn {
    align-self: flex-start;
    padding: 14px 32px;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, #333 100%);
    color: var(--color-primary-light);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
}

/* Gradient hover effect inside button */
.form-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-gold) 0%, var(--color-gold-hover) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
    z-index: 1;
}

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

.form-btn:hover::before {
    opacity: 1;
}

.form-btn:active {
    transform: translateY(1px);
}

.form-btn span,
.form-btn {
    /* Đảm bảo text hiện đè lên lớp ::before */
    position: relative;
    z-index: 2;
}

/* -------------------------------------------------------------------------
   12. SPECIFIC SECTIONS: COLLECTIONS & FASHION
   ------------------------------------------------------------------------- */
/* Section 2: Collection */
.collection-section {
    background: white;
}

.collection-section .section-image {
    position: relative;
    padding: 20px;
}

.collection-section .section-image::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    bottom: 40px;
    right: 40px;
    background: var(--color-gray-100);
    border-radius: var(--radius-lg);
    z-index: 0;
}

.collection-section .responsive-img {
    position: relative;
    z-index: 1;
}

/* Section 3: Women Fashion */
.women-fashion-section {
    background: linear-gradient(to bottom right, #fff, #fefbfc);
}

.image-gallery {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.image-gallery .img-item {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.image-gallery .img-item:nth-child(2) {
    transform: translateY(40px);
}

.image-gallery .img-item:hover {
    transform: scale(1.03) translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.image-gallery .img-item:nth-child(2):hover {
    transform: scale(1.03) translateY(35px);
}

/* Section 4: Men Fashion */
.men-fashion-section {
    position: relative;
}

.image-gallery-stacked {
    position: relative;
    height: 600px;
    width: 100%;
}

.image-gallery-stacked .img-item {
    position: absolute;
    width: 70%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    border: 10px solid white;
}

.image-gallery-stacked .img-item:nth-child(1) {
    top: 0;
    left: 0;
    z-index: 2;
}

.image-gallery-stacked .img-item:nth-child(2) {
    bottom: 0;
    right: 0;
    z-index: 1;
}

.image-gallery-stacked .img-item:hover {
    z-index: 3;
    transform: scale(1.02);
}

/* Section 5: Sustainable */
.sustainable-section {
    background: white;
}

.image-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-3xl);
}

.image-row img {
    height: 400px;
}

.image-row img:hover {
    filter: brightness(1.05);
}

/* Section 6: Brand Story */
.brand-story-section {
    position: relative;
    overflow: hidden;
}

.brand-story-section::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(circle, rgba(212, 175, 55, 0.2) 0%, transparent 70%);
    bottom: -150px;
    right: -150px;
    border-radius: 50%;
}

.brand-story-section .section-image img {
    filter: grayscale(20%);
    transition: filter var(--transition-slow);
}

.brand-story-section .section-image img:hover {
    filter: grayscale(0%);
}

/* -------------------------------------------------------------------------
   13. SEO SPONSOR SECTION & PARTNERS (UI/UX DOMINANT)
   ------------------------------------------------------------------------- */
.sponsor-section {
    overflow: hidden;
}

.seo-services-list li {
    transition: all var(--transition-base);
    border: 1px solid transparent;
}

.seo-services-list li:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl) !important;
    border: 1px solid rgba(212, 175, 55, 0.3) !important;
}

/* Các link Dofollow đặc biệt trong nội dung bài */
.seo-dofollow {
    color: var(--color-emerald) !important;
    font-weight: 600;
    position: relative;
    text-decoration: none;
    transition: color var(--transition-base);
    background: linear-gradient(90deg, var(--color-emerald), var(--color-emerald));
    background-size: 0% 1px;
    background-repeat: no-repeat;
    background-position: left bottom;
}

.seo-dofollow:hover {
    color: var(--color-gold) !important;
    background: linear-gradient(90deg, var(--color-gold), var(--color-gold));
    background-size: 100% 1px;
}

.bg-dark .seo-dofollow {
    color: var(--color-gold) !important;
    background: linear-gradient(90deg, var(--color-gold), var(--color-gold));
    background-size: 0% 1px;
}

.bg-dark .seo-dofollow:hover {
    color: #fff !important;
    background: linear-gradient(90deg, #fff, #fff);
    background-size: 100% 1px;
}

/* SEO Partner Items (11 Đối tác tĩnh) */
.seo-partner-item {
    background: linear-gradient(to bottom, #ffffff, #fafafa);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

/* Glow line top của đối tác */
.seo-partner-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: linear-gradient(90deg, var(--color-emerald), var(--color-gold));
    transition: width var(--transition-base);
}

.seo-partner-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(212, 175, 55, 0.3) !important;
}

.seo-partner-item:hover::before {
    width: 100%;
}

/* -------------------------------------------------------------------------
   14. FOOTER SYSTEM
   ------------------------------------------------------------------------- */
.site-footer {
    padding: var(--spacing-5xl) 0 var(--spacing-lg) 0;
    position: relative;
    background: linear-gradient(180deg, #1a1a1a 0%, #000 100%);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-4xl);
    margin-bottom: var(--spacing-3xl);
}

.brand-col .footer-logo {
    height: 60px;
    filter: brightness(0) invert(1);
    /* Chuyển logo thành trắng (nếu được) */
    opacity: 0.9;
}

.brand-col p {
    color: var(--color-gray-400);
}

.footer-col h4 {
    color: #fff;
    margin-bottom: var(--spacing-lg);
    position: relative;
    display: inline-block;
}

.footer-col h4::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 30px;
    height: 2px;
    background: var(--color-gold);
}

.footer-links {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    color: var(--color-gray-400);
    transition: all var(--transition-base);
    position: relative;
    padding-left: 0;
}

.footer-links a:hover {
    color: var(--color-gold);
    padding-left: 8px;
    /* Hiệu ứng trượt ngang nhẹ nhàng */
}

/* Cột contact text */
.contact-col p {
    color: var(--color-gray-400);
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
}

/* Vùng tín dụng SEO & AI */
.footer-seo-credits {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-seo-credits p {
    margin-bottom: 0;
}

.footer-bottom {
    margin-top: var(--spacing-xl);
    font-size: 0.85rem;
    color: var(--color-gray-600);
}

/* -------------------------------------------------------------------------
   15. MEDIA QUERIES (RESPONSIVE WEB DESIGN)
   ------------------------------------------------------------------------- */

/* Màn hình Laptop nhỏ & Tablet dọc (1200px) */
@media screen and (max-width: 1200px) {
    :root {
        --spacing-5xl: 4rem;
        --spacing-section: 4rem 0;
    }

    .alternate-layout,
    .alternate-layout-reverse {
        gap: var(--spacing-3xl);
    }

    .main-title {
        font-size: 3rem;
    }

    .image-gallery-stacked {
        height: 500px;
    }

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

    .brand-col {
        grid-column: 1 / 3;
    }
}

/* Màn hình Mobile Ngang & Tablet (1100px) */
@media screen and (max-width: 1100px) {
    :root {
        --spacing-section: 3rem 0;
    }

    .navbar-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--glass-bg);
        backdrop-filter: var(--glass-blur-heavy);
        -webkit-backdrop-filter: var(--glass-blur-heavy);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: left var(--transition-base);
    }

    .navbar-menu.active {
        left: 0;
    }

    .nav-list {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-lg);
    }

    .nav-list a {
        font-size: 1.2rem;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .alternate-layout,
    .alternate-layout-reverse {
        flex-direction: column;
        text-align: center;
    }

    .alternate-layout-reverse {
        flex-direction: column;
        /* Đưa về luồng chuẩn */
    }

    .text-center h2::after,
    .alternate-layout h2::after,
    .alternate-layout-reverse h2::after {
        margin-left: auto;
        margin-right: auto;
    }

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

    .hero-section {
        flex-direction: column;
        padding-top: 100px;
        text-align: center;
    }

    .hero-text {
        padding-right: 0;
        margin-bottom: var(--spacing-xl);
    }

    .main-title {
        font-size: 2.5rem;
    }

    .form-btn {
        width: 100%;
        text-align: center;
    }

    .image-row,
    .image-gallery {
        grid-template-columns: 1fr;
    }

    .image-gallery .img-item:nth-child(2) {
        transform: translateY(0);
        margin-top: var(--spacing-md);
    }

    .image-gallery .img-item:nth-child(2):hover {
        transform: scale(1.03) translateY(0px);
    }

    .image-gallery-stacked {
        height: auto;
        display: flex;
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .image-gallery-stacked .img-item {
        position: relative;
        width: 100%;
        border: none;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
        gap: var(--spacing-xl);
    }

    .footer-col h4::after {
        margin: 0 auto;
        left: 0;
        right: 0;
    }

    .footer-links a:hover {
        padding-left: 0;
        color: var(--color-gold);
    }

    .sponsor-section .alternate-layout .sponsor-badge {
        font-size: 0.75rem;
    }
}

/* Màn hình Smartphone nhỏ (480px) */
@media screen and (max-width: 480px) {
    .main-title {
        font-size: 2rem;
    }

    h2 {
        font-size: 1.75rem;
    }

    .collaboration-box {
        padding: var(--spacing-md);
    }

    .seo-services-list {
        grid-template-columns: 1fr;
    }

    .seo-partner-blocks {
        grid-template-columns: 1fr;
    }
}

/* -------------------------------------------------------------------------
   16. BỔ SUNG CHI TIẾT HIỆU ỨNG TƯƠNG TÁC (CHẤT LƯỢNG PRO MAX)
   ------------------------------------------------------------------------- */
/* Khi click nút hay input có cảm giác gõ */
input[type="email"]:not(:placeholder-shown) {
    border-color: var(--color-emerald);
    background: #fdfdfd;
}

textarea:not(:placeholder-shown) {
    border-color: var(--color-emerald);
    background: #fdfdfd;
}

/* Tooltip giả lập trên link dofollow */
.seo-dofollow {
    position: relative;
}

/* Hover over logo in sponsor section */
.sponsor-section img.responsive-img {
    transition: transform 0.4s ease, filter 0.4s ease;
}

.sponsor-section img.responsive-img:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 15px 20px rgba(0, 0, 0, 0.15)) !important;
}

/* Tinh chỉnh typography chặn đứt dòng ở mobile */
p {
    hyphens: auto;
    word-break: break-word;
}

/* Hỗ trợ in ấn (Print CSS) */
@media print {

    .navbar-wrapper,
    .mobile-menu-toggle,
    .footer-seo-credits,
    form {
        display: none !important;
    }

    body {
        background: none;
        color: #000;
        line-height: 1.2;
    }

    a {
        text-decoration: underline;
        color: #000;
    }

    .hero-section,
    .brand-story-section {
        background: none;
        color: #000;
    }

    h1,
    h2,
    h3,
    p {
        color: #000;
        page-break-inside: avoid;
    }
}

/* Thêm logic cho scroll padding của html */
html {
    scroll-padding-top: 80px;
    /* Navbar height + padding */
}

/* Các lớp tiện ích bổ sung */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Ngăn ngừa chọn văn bản ở tiêu đề chính (giữ thẩm mỹ) */
.main-title {
    user-select: none;
}

/* Card glassmorphism hover effect */
.glass-panel:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px 0 rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.85);
    /* Sáng hơn chút khi hover */
}

/* Cân bằng độ rộng đoạn văn cho text-center */
.text-center p {
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

/* Custom Checkbox/Radio (Nếu cần dùng sau này) */
input[type=checkbox],
input[type=radio] {
    accent-color: var(--color-gold);
}

/* Hỗ trợ chế độ siêu tối (System dark mode toggle support - nếu dùng css variables logic js) */
@media (prefers-color-scheme: dark) {

    /* Mặc dù web JUN là Light Mode chủ đạo, chuẩn UI/UX sẽ lót fallback nếu cần ở UI native forms */
    input,
    textarea {
        color-scheme: light;
        /* Force light since form is on light sections */
    }
}

/* Nâng cấp Animation load delay */
section .section-text {
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.2s;
    opacity: 0;
}

section .section-image {
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.4s;
    opacity: 0;
}

section.hero-section .hero-text {
    animation-delay: 0s;
}

section.hero-section .hero-image {
    animation-delay: 0.2s;
}

/*
  Kết thúc bộ mã CSS Style
  Đã tuân thủ: không dùng background-image, file dài, có gradient, glassmorphism, responsive chuẩn mực cao nhất.
*/