/* -------------------------------------------------------------
 * VNMAX PREMIUM CSS DESIGN SYSTEM
 * Style Guide: AI & Tech Corporate Hybrid Vibe
 * ------------------------------------------------------------- */

/* Custom Variables */
:root {
    /* Color System */
    --color-bg-dark: #090d16;
    --color-bg-dark-card: #131b2e;
    --color-bg-light: #ffffff;
    --color-bg-light-sec: #f8fafc;
    --color-text-dark-primary: #ffffff;
    --color-text-dark-secondary: #94a3b8;
    --color-text-light-primary: #0f172a;
    --color-text-light-secondary: #475569;
    
    /* Accents & Gradients */
    --color-primary: #6366f1; /* Indigo */
    --color-primary-hover: #4f46e5;
    --color-secondary: #06b6d4; /* Cyan */
    --color-secondary-hover: #0891b2;
    --color-success: #10b981; /* Green */
    --color-danger: #ef4444; /* Red */
    
    --grad-primary: linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);
    --grad-dark-hero: radial-gradient(circle at 50% 50%, #1e1b4b 0%, #090d16 100%);
    --grad-text: linear-gradient(90deg, #6366f1, #06b6d4);
    
    /* Typography */
    --font-heading: 'Outfit', 'Inter', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Layout & Utilities */
    --container-width: 1200px;
    --border-radius-sm: 8px;
    --border-radius-md: 16px;
    --border-radius-lg: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 30px rgba(99, 102, 241, 0.05);
    --shadow-lg: 0 20px 45px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px rgba(6, 182, 212, 0.2);
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-text-light-secondary);
    background-color: var(--color-bg-light);
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-text-light-primary);
    font-weight: 700;
    line-height: 1.25;
}

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

ul {
    list-style: none;
}

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

input, select, textarea, button {
    font-family: inherit;
    font-size: inherit;
    outline: none;
    border: none;
}

.container {
    width: 100%;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Typography Helpers */
.text-gradient {
    background: var(--grad-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

/* Button System */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-weight: 600;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    gap: 8px;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.125rem;
    border-radius: var(--border-radius-md);
}

.btn-primary {
    background: var(--grad-primary);
    color: #ffffff;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5), var(--shadow-glow);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.18);
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    border: 1.5px solid var(--color-secondary);
    color: var(--color-secondary);
}

.btn-outline:hover {
    background-color: var(--color-secondary);
    color: #000000;
    box-shadow: var(--shadow-glow);
}

.btn-block {
    width: 100%;
}

/* Header & Navigation */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: rgba(9, 13, 22, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    padding: 16px 0;
    transition: var(--transition);
}

.site-header.scrolled {
    padding: 12px 0;
    background-color: rgba(9, 13, 22, 0.95);
    box-shadow: var(--shadow-lg);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    transition: var(--transition);
}

.logo-img {
    height: 48px;
    width: auto;
    display: block;
    object-fit: contain;
    transition: var(--transition);
}

.site-header.scrolled .logo-img {
    height: 40px;
}

.main-nav ul {
    display: flex;
    gap: 32px;
}

.main-nav a {
    color: var(--color-text-dark-secondary);
    font-size: 0.938rem;
    font-weight: 500;
}

.main-nav a:hover,
.main-nav a.active {
    color: #ffffff;
    text-shadow: 0 0 10px rgba(99, 102, 241, 0.5);
}

.header-cta {
    display: flex;
    align-items: center;
    gap: 16px;
}

.icon-zalo {
    width: 16px;
    height: 16px;
}

.mobile-nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    cursor: pointer;
}

.mobile-nav-toggle .bar {
    width: 24px;
    height: 2px;
    background-color: #ffffff;
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero Section */
.hero-section {
    background: var(--grad-dark-hero);
    color: var(--color-text-dark-primary);
    padding: 180px 0 120px;
    position: relative;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    z-index: 1;
    pointer-events: none;
}

.bg-glow-primary {
    width: 400px;
    height: 400px;
    background-color: rgba(99, 102, 241, 0.15);
    top: -100px;
    left: -100px;
}

.bg-glow-secondary {
    width: 350px;
    height: 350px;
    background-color: rgba(6, 182, 212, 0.15);
    bottom: -50px;
    right: -50px;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.badge {
    align-self: flex-start;
    background-color: rgba(99, 102, 241, 0.15);
    border: 1px solid rgba(99, 102, 241, 0.3);
    color: #a5b4fc;
    padding: 6px 14px;
    border-radius: 100px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-content h1 {
    font-size: 3.25rem;
    font-weight: 800;
    color: #ffffff;
    line-height: 1.15;
}

.hero-lead {
    font-size: 1.125rem;
    color: var(--color-text-dark-secondary);
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-top: 10px;
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding-top: 32px;
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-num {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-secondary);
}

.stat-label {
    font-size: 0.813rem;
    color: var(--color-text-dark-secondary);
}

/* Tech Graphic Card Visual */
.hero-visual {
    display: flex;
    justify-content: center;
}

.tech-card-wrapper {
    width: 100%;
    max-width: 420px;
    perspective: 1000px;
}

.tech-card {
    background-color: var(--color-bg-dark-card);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-lg), 0 0 30px rgba(99, 102, 241, 0.1);
    overflow: hidden;
    transform: rotateY(-8deg) rotateX(8deg);
    transition: var(--transition);
}

.tech-card:hover {
    transform: rotateY(0deg) rotateX(0deg) scale(1.02);
}

.card-header {
    background-color: rgba(9, 13, 22, 0.5);
    padding: 12px 18px;
    display: flex;
    align-items: center;
    gap: 6px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.card-header .dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}

.card-header .dot.red { background-color: var(--color-danger); }
.card-header .dot.yellow { background-color: #f59e0b; }
.card-header .dot.green { background-color: var(--color-success); }

.card-title {
    color: var(--color-text-dark-secondary);
    font-size: 0.75rem;
    font-family: var(--font-body);
    font-weight: 500;
    margin-left: 8px;
}

.card-body-content {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.chart-flow {
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: relative;
}

.flow-node {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    background-color: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.06);
    padding: 10px 14px;
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    color: var(--color-text-dark-secondary);
    min-width: 80px;
}

.flow-node.active {
    background-color: rgba(6, 182, 212, 0.1);
    border-color: var(--color-secondary);
    color: #ffffff;
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.2);
}

.flow-node .node-icon {
    font-size: 1.25rem;
}

.flow-line {
    flex-grow: 1;
    height: 2px;
    background-color: rgba(255, 255, 255, 0.06);
    margin: 0 10px;
    position: relative;
}

.flow-line.active {
    background: linear-gradient(90deg, var(--color-secondary), rgba(255,255,255,0.06));
}

.flow-line.active::after {
    content: '';
    position: absolute;
    width: 6px;
    height: 6px;
    background-color: var(--color-secondary);
    border-radius: 50%;
    top: -2px;
    left: 0;
    animation: flow-point 2s infinite linear;
}

@keyframes flow-point {
    0% { left: 0%; opacity: 1; }
    100% { left: 100%; opacity: 0; }
}

.terminal-box {
    background-color: #05070c;
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: var(--border-radius-sm);
    padding: 14px;
    font-family: monospace;
    font-size: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 6px;
    min-height: 100px;
}

.text-dim { color: #475569; }
.text-cyan { color: var(--color-secondary); }
.text-purple { color: #a78bfa; }
.text-green { color: var(--color-success); }

/* Section Standard Header */
.section-header {
    max-width: 700px;
    margin: 0 auto 56px;
}

.section-tag {
    color: var(--color-primary);
    font-size: 0.813rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    display: inline-block;
    margin-bottom: 12px;
}

.section-header h2 {
    font-size: 2.25rem;
    color: var(--color-text-light-primary);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.063rem;
    color: var(--color-text-light-secondary);
}

/* Pain Points Section */
.thach-thuc-section {
    padding: 100px 0;
    background-color: var(--color-bg-light);
}

.challenges-intro {
    margin-bottom: 40px;
}

.highlight-text {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-light-primary);
}

.challenges-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 56px;
}

.challenge-card {
    background-color: var(--color-bg-light);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: var(--border-radius-md);
    padding: 32px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.challenge-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.15);
}

.challenge-card .card-icon {
    width: 48px;
    height: 48px;
    background-color: rgba(99, 102, 241, 0.08);
    color: var(--color-primary);
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    transition: var(--transition);
}

.challenge-card:hover .card-icon {
    background-color: var(--color-primary);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.challenge-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.challenges-summary {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--color-bg-light-sec);
    padding: 24px;
    border-radius: var(--border-radius-md);
    border-left: 4px solid var(--color-primary);
}

.summary-highlight {
    font-size: 1.063rem;
    font-weight: 600;
    color: var(--color-text-light-primary);
}

/* About VNMAX Section */
.ve-vnmax-section {
    padding: 100px 0;
    background-color: var(--color-bg-dark);
    color: var(--color-text-dark-primary);
    position: relative;
    overflow: hidden;
}

.ve-vnmax-section h2 {
    color: #ffffff;
}

.ve-vnmax-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 60px;
    align-items: center;
}

.ve-vnmax-image {
    position: relative;
}

.image-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(6, 182, 212, 0.05));
    border: 1.5px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--border-radius-lg);
    padding: 48px;
    position: relative;
    z-index: 2;
    overflow: hidden;
}

.image-glow {
    position: absolute;
    width: 200px;
    height: 200px;
    background-color: rgba(99, 102, 241, 0.25);
    border-radius: 50%;
    filter: blur(80px);
    top: -50px;
    right: -50px;
    z-index: 1;
}

.box-content {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.box-content h3 {
    color: var(--color-secondary);
    font-size: 1.5rem;
}

.focus-quote {
    font-size: 1.125rem;
    font-weight: 500;
    line-height: 1.5;
    border-left: 2px solid var(--color-secondary);
    padding-left: 16px;
    color: var(--color-text-dark-secondary);
}

.focus-points {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 10px;
}

.point-item {
    font-weight: 600;
    font-size: 0.938rem;
    color: #ffffff;
}

.ve-vnmax-content p {
    color: var(--color-text-dark-secondary);
    margin-bottom: 18px;
}

.goals-list {
    margin-top: 32px;
}

.goals-list h3 {
    font-size: 1.125rem;
    color: #ffffff;
    margin-bottom: 16px;
}

.styled-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.styled-list li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: var(--color-text-dark-secondary);
    font-size: 0.938rem;
}

.styled-list .bullet {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-secondary);
    margin-top: 8px;
    flex-shrink: 0;
}

.styled-list strong {
    color: #ffffff;
}

/* Solutions Section (Tabs) */
.giai-phap-section {
    padding: 100px 0;
    background-color: var(--color-bg-light-sec);
}

.tabs-nav {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 48px;
    flex-wrap: wrap;
}

.tab-btn {
    background-color: var(--color-bg-light);
    border: 1px solid rgba(0,0,0,0.06);
    color: var(--color-text-light-secondary);
    padding: 14px 24px;
    border-radius: 100px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.tab-btn svg {
    stroke: var(--color-text-light-secondary);
    transition: var(--transition);
}

.tab-btn:hover {
    border-color: rgba(99, 102, 241, 0.3);
    color: var(--color-primary);
}

.tab-btn.active {
    background-color: var(--color-text-light-primary);
    border-color: var(--color-text-light-primary);
    color: #ffffff;
}

.tab-btn.active svg {
    stroke: #ffffff;
}

.tabs-content {
    background-color: var(--color-bg-light);
    border: 1px solid rgba(0,0,0,0.04);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.tab-pane {
    display: none;
    padding: 48px;
}

.tab-pane.active {
    display: block;
    animation: fadeIn 0.5s ease-in-out;
}

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

.tab-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
    align-items: center;
}

.tab-text h3 {
    font-size: 1.75rem;
    margin-bottom: 16px;
}

.tab-text p {
    color: var(--color-text-light-secondary);
    margin-bottom: 24px;
}

.feature-bullets {
    display: flex;
    flex-direction: column;
    gap: 14px;
    margin-bottom: 32px;
}

.feature-bullets li {
    position: relative;
    padding-left: 20px;
    font-size: 0.938rem;
}

.feature-bullets li::before {
    content: "⚡";
    position: absolute;
    left: 0;
    top: 2px;
    color: var(--color-primary);
    font-size: 0.75rem;
}

.feature-bullets li strong {
    color: var(--color-text-light-primary);
}

/* Solution Visual Mockups */
.tab-visual {
    display: flex;
    justify-content: center;
}

.visual-mockup {
    width: 100%;
    max-width: 360px;
    background-color: var(--color-bg-dark-card);
    border-radius: var(--border-radius-md);
    border: 1px solid rgba(255,255,255,0.06);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    font-size: 0.813rem;
}

.mock-header {
    background-color: rgba(9, 13, 22, 0.4);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 1px solid rgba(255,255,255,0.04);
    color: #ffffff;
    font-weight: 500;
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.status-indicator.online { background-color: var(--color-success); }

.mock-body {
    padding: 18px;
}

/* Marketing mock styles */
.social-post-preview {
    background-color: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.04);
    border-radius: var(--border-radius-sm);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.social-post-preview .user-info {
    display: flex;
    gap: 8px;
    align-items: center;
}

.social-post-preview .avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background-color: var(--color-primary);
    color: #ffffff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.75rem;
}

.social-post-preview .name {
    display: block;
    color: #ffffff;
    font-weight: 600;
}

.social-post-preview .time {
    display: block;
    color: var(--color-text-dark-secondary);
    font-size: 0.688rem;
}

.social-post-preview .post-content {
    color: #e2e8f0;
}

.post-image-placeholder {
    height: 120px;
    background-color: rgba(0,0,0,0.3);
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.tech-graphic-mini {
    background: rgba(6, 182, 212, 0.1);
    border: 1px dashed var(--color-secondary);
    color: var(--color-secondary);
    padding: 4px 10px;
    border-radius: 4px;
    font-size: 0.688rem;
    font-weight: 600;
}

/* AI mock styles */
.chat-message {
    margin-bottom: 12px;
    max-width: 85%;
}

.chat-message.user {
    margin-left: auto;
    background-color: var(--color-primary);
    color: #ffffff;
    border-radius: 12px 12px 0 12px;
    padding: 8px 12px;
}

.chat-message.bot {
    margin-right: auto;
    background-color: rgba(255,255,255,0.05);
    color: #e2e8f0;
    border-radius: 12px 12px 12px 0;
    padding: 8px 12px;
    border: 1px solid rgba(255,255,255,0.04);
}

.typing-effect {
    border-right: 2px solid var(--color-secondary);
    white-space: normal;
    animation: blink-caret 0.75s step-end infinite;
}

@keyframes blink-caret {
    from, to { border-color: transparent }
    50% { border-color: var(--color-secondary); }
}

/* Management mock styles */
.dashboard-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-bottom: 14px;
}

.dash-stat-box {
    background-color: rgba(255,255,255,0.02);
    border: 1px solid rgba(255,255,255,0.04);
    padding: 10px;
    border-radius: var(--border-radius-sm);
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.dash-stat-box .label {
    color: var(--color-text-dark-secondary);
    font-size: 0.688rem;
}

.dash-stat-box .value {
    color: var(--color-secondary);
    font-size: 1.125rem;
    font-weight: 700;
}

.simple-chart {
    height: 100px;
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    padding-top: 10px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.chart-bar {
    width: 20px;
    background: var(--grad-primary);
    border-radius: 4px 4px 0 0;
    animation: barGrow 1.5s ease-in-out forwards;
}

@keyframes barGrow {
    from { height: 0; }
}

/* Finance mock styles */
.transaction-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.tx-item {
    background-color: rgba(255,255,255,0.02);
    border-radius: 4px;
    padding: 8px 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-left: 3px solid;
}

.tx-item.positive {
    border-left-color: var(--color-success);
    color: #e2e8f0;
}

.tx-item.positive strong {
    color: var(--color-success);
}

.tx-item.negative {
    border-left-color: var(--color-danger);
    color: #e2e8f0;
}

.tx-item.negative strong {
    color: var(--color-danger);
}

/* AI Acceleration Section */
.ai-acceleration-section {
    padding: 100px 0;
    background-color: var(--color-bg-dark);
    color: var(--color-text-dark-primary);
    position: relative;
    overflow: hidden;
}

.ai-acceleration-section h2 {
    color: #ffffff;
}

.ai-acc-grid {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 2;
}

.ai-acc-content p {
    color: var(--color-text-dark-secondary);
    margin-bottom: 20px;
}

.ai-features-list {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 14px;
    margin-top: 28px;
}

.ai-feat-item {
    background-color: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.05);
    padding: 14px 20px;
    border-radius: var(--border-radius-sm);
    display: flex;
    align-items: center;
    gap: 10px;
    transition: var(--transition);
}

.ai-feat-item:hover {
    background-color: rgba(255,255,255,0.06);
    border-color: var(--color-secondary);
}

.ai-feat-item h4 {
    font-size: 0.875rem;
    color: #ffffff;
    font-weight: 600;
}

.ai-feat-item h4::before {
    content: "✦";
    color: var(--color-secondary);
    margin-right: 8px;
}

.benefit-box {
    background: linear-gradient(135deg, rgba(255,255,255,0.03) 0%, rgba(255,255,255,0.01) 100%);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    backdrop-filter: blur(10px);
}

.benefit-box h3 {
    font-size: 1.375rem;
    margin-bottom: 24px;
    color: var(--color-secondary);
}

.benefit-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.b-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.b-num {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 800;
    color: rgba(99, 102, 241, 0.4);
    line-height: 1;
}

.b-text h4 {
    color: #ffffff;
    font-size: 0.938rem;
    margin-bottom: 4px;
}

.b-text p {
    color: var(--color-text-dark-secondary);
    font-size: 0.875rem;
}

/* Why Choose VNMAX Section */
.tai-sao-chon-section {
    padding: 100px 0;
    background-color: var(--color-bg-light);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.adv-card {
    background-color: var(--color-bg-light-sec);
    border: 1px solid rgba(0,0,0,0.03);
    border-radius: var(--border-radius-md);
    padding: 40px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.adv-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    background-color: var(--color-bg-light);
    border-color: rgba(99, 102, 241, 0.15);
}

.adv-icon {
    font-size: 2.25rem;
    margin-bottom: 20px;
}

.adv-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
}

.adv-card p {
    font-size: 0.938rem;
    color: var(--color-text-light-secondary);
    line-height: 1.6;
}

/* Future Roadmap Section */
.dinh-huong-section {
    padding: 100px 0;
    background-color: var(--color-bg-light-sec);
}

.roadmap-wrapper {
    max-width: 900px;
    margin: 50px auto 0;
    position: relative;
}

.roadmap-line {
    position: absolute;
    left: 50%;
    top: 0;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary), rgba(0,0,0,0.02));
    transform: translateX(-50%);
}

.roadmap-item {
    display: flex;
    justify-content: flex-end;
    width: 50%;
    padding: 20px 40px;
    position: relative;
}

.roadmap-item.right {
    margin-left: auto;
    justify-content: flex-start;
}

.roadmap-dot {
    position: absolute;
    right: -8px;
    top: 28px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--color-primary);
    border: 3px solid var(--color-bg-light-sec);
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.8);
    z-index: 2;
    transition: var(--transition);
}

.roadmap-item.right .roadmap-dot {
    left: -8px;
    background-color: var(--color-secondary);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.8);
}

.roadmap-item:hover .roadmap-dot {
    transform: scale(1.3);
}

.roadmap-content {
    background-color: var(--color-bg-light);
    border: 1px solid rgba(0,0,0,0.03);
    padding: 24px;
    border-radius: var(--border-radius-md);
    box-shadow: var(--shadow-sm);
    max-width: 380px;
    transition: var(--transition);
}

.roadmap-content:hover {
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.1);
}

.roadmap-badge {
    display: inline-block;
    font-size: 0.688rem;
    font-weight: 700;
    color: var(--color-primary);
    text-transform: uppercase;
    margin-bottom: 6px;
}

.roadmap-item.right .roadmap-badge {
    color: var(--color-secondary);
}

.roadmap-content h3 {
    font-size: 1.125rem;
    margin-bottom: 8px;
}

.roadmap-content p {
    font-size: 0.875rem;
    color: var(--color-text-light-secondary);
    margin-bottom: 0;
}

/* Contact Form Section */
.lien-he-section {
    padding: 100px 0;
    background-color: var(--color-bg-light);
}

.contact-cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: 40px;
    margin-bottom: 50px;
}

.contact-card-item {
    background-color: var(--color-bg-light-sec);
    border: 1px solid rgba(0, 0, 0, 0.04);
    border-radius: var(--border-radius-md);
    padding: 40px 24px;
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.contact-card-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.15);
    background-color: #ffffff;
}

.contact-card-icon {
    width: 56px;
    height: 56px;
    background-color: rgba(99, 102, 241, 0.08);
    color: var(--color-primary);
    font-size: 1.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    transition: var(--transition);
}

.contact-card-item:hover .contact-card-icon {
    background-color: var(--color-primary);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.contact-card-item h3 {
    font-size: 1.125rem;
    margin-bottom: 12px;
    color: var(--color-text-light-primary);
}

.contact-card-item p {
    margin-bottom: 0;
}

.contact-card-item p a {
    color: var(--color-text-light-primary);
    font-weight: 700;
    font-size: 1.188rem;
}

.contact-card-item p a:hover {
    color: var(--color-primary);
}

.contact-card-action {
    display: block;
    margin-top: 12px;
    font-size: 0.813rem;
    color: var(--color-text-light-secondary);
    font-weight: 500;
}

.contact-quote-centered {
    max-width: 800px;
    margin: 0 auto;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    padding-top: 32px;
}

.contact-quote-centered p {
    font-style: italic;
    font-size: 1rem;
    color: var(--color-text-light-secondary);
    line-height: 1.6;
}

.contact-form h3 {
    font-size: 1.5rem;
    margin-bottom: 8px;
}

.form-sub {
    font-size: 0.875rem;
    margin-bottom: 24px;
    color: var(--color-text-light-secondary);
}

.form-group {
    margin-bottom: 20px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.form-group label {
    font-size: 0.813rem;
    font-weight: 600;
    color: var(--color-text-light-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    background-color: var(--color-bg-light-sec);
    border: 1px solid rgba(0,0,0,0.06);
    border-radius: var(--border-radius-sm);
    padding: 12px 16px;
    font-size: 0.938rem;
    color: var(--color-text-light-primary);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-primary);
    background-color: #ffffff;
    box-shadow: 0 0 10px rgba(99, 102, 241, 0.1);
}

.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23475569' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    background-size: 16px;
}

.error-msg {
    font-size: 0.75rem;
    color: var(--color-danger);
    display: none;
}

.form-status {
    margin-top: 14px;
    padding: 10px;
    border-radius: var(--border-radius-sm);
    font-size: 0.875rem;
    display: none;
    text-align: center;
}

.form-status.success {
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
    display: block;
}

.form-status.error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--color-danger);
    display: block;
}

/* Site Footer */
.site-footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-dark-primary);
    padding: 80px 0 0;
    border-top: 1px solid rgba(255,255,255,0.05);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 60px;
    padding-bottom: 50px;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.footer-desc {
    color: var(--color-text-dark-secondary);
    font-size: 0.875rem;
}

.footer-info h3,
.footer-links h3 {
    font-size: 1.125rem;
    color: #ffffff;
    margin-bottom: 24px;
    position: relative;
    padding-bottom: 8px;
}

.footer-info h3::after,
.footer-links h3::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 30px;
    height: 2px;
    background-color: var(--color-secondary);
}

.footer-info p {
    color: var(--color-text-dark-secondary);
    font-size: 0.875rem;
    margin-bottom: 12px;
}

.footer-info .company-name {
    color: #ffffff;
    font-size: 0.938rem;
    margin-bottom: 16px;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-links a {
    color: var(--color-text-dark-secondary);
    font-size: 0.875rem;
}

.footer-links a:hover {
    color: #ffffff;
    padding-left: 4px;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.04);
    padding: 24px 0;
    font-size: 0.813rem;
    color: var(--color-text-dark-secondary);
}

.footer-bottom-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.verification-note {
    font-style: italic;
    color: var(--color-secondary);
}

/* Floating Action Widgets */
.floating-widgets {
    position: fixed;
    bottom: 30px;
    right: 30px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    z-index: 999;
}

.float-btn {
    width: 52px;
    height: 52px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
    position: relative;
    transition: var(--transition);
}

.float-btn:hover {
    transform: scale(1.1);
}

.float-phone {
    background-color: var(--color-success);
}

.float-phone svg {
    width: 24px;
    height: 24px;
    animation: phone-shake 1.5s infinite ease-in-out;
}

@keyframes phone-shake {
    0%, 100% { transform: rotate(0); }
    10%, 90% { transform: rotate(-10deg); }
    20%, 80% { transform: rotate(10deg); }
    30%, 50%, 70% { transform: rotate(-15deg); }
    40%, 60% { transform: rotate(15deg); }
}

.float-zalo {
    background-color: #0068ff;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 0.75rem;
}

.float-zalo .zalo-text-icon {
    letter-spacing: -0.5px;
}

.float-top {
    background-color: rgba(9, 13, 22, 0.8);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255,255,255,0.08);
    opacity: 0;
    visibility: hidden;
}

.float-top.visible {
    opacity: 1;
    visibility: visible;
}

.float-top svg {
    width: 20px;
    height: 20px;
}

.float-btn .tooltip {
    position: absolute;
    right: 68px;
    top: 50%;
    transform: translateY(-50%) translateX(10px);
    background-color: #0f172a;
    color: #ffffff;
    padding: 6px 12px;
    border-radius: var(--border-radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.float-btn .tooltip::after {
    content: '';
    position: absolute;
    left: 100%;
    top: 50%;
    transform: translateY(-50%);
    border-width: 5px;
    border-style: solid;
    border-color: transparent transparent transparent #0f172a;
}

.float-btn:hover .tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%) translateX(0);
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(9, 13, 22, 0.7);
    backdrop-filter: blur(8px);
}

.modal-wrapper {
    background-color: var(--color-bg-light);
    border-radius: var(--border-radius-md);
    width: 90%;
    max-width: 750px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    position: relative;
    z-index: 10;
    box-shadow: var(--shadow-lg);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}

.modal.active .modal-wrapper {
    transform: scale(1);
}

.modal-header {
    padding: 24px;
    border-bottom: 1px solid rgba(0,0,0,0.06);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 1.25rem;
    color: var(--color-text-light-primary);
}

.close-modal-btn {
    background: transparent;
    font-size: 1.75rem;
    cursor: pointer;
    color: var(--color-text-light-secondary);
    line-height: 1;
    transition: var(--transition);
}

.close-modal-btn:hover {
    color: var(--color-primary);
}

.modal-body {
    padding: 24px;
    overflow-y: auto;
    font-size: 0.938rem;
    color: var(--color-text-light-secondary);
    line-height: 1.7;
}

.modal-body.text-content h4 {
    margin: 20px 0 8px;
    color: var(--color-text-light-primary);
    font-size: 1.063rem;
}

.modal-body.text-content p {
    margin-bottom: 12px;
}

.modal-body.text-content ul,
.modal-body.text-content ol {
    margin-bottom: 16px;
    padding-left: 20px;
}

.modal-body.text-content li {
    margin-bottom: 8px;
}

.modal-body .last-updated {
    font-style: italic;
    font-size: 0.813rem;
    margin-bottom: 20px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid rgba(0,0,0,0.06);
    display: flex;
    justify-content: flex-end;
}

/* Scroll Animation Hooks */
.scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.scroll-reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Media Queries */
@media (max-width: 1024px) {
    html {
        font-size: 15px;
    }
    
    .hero-container,
    .ve-vnmax-grid,
    .ai-acc-grid,
    .lien-he-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    
    .hero-visual,
    .ve-vnmax-image,
    .ai-acc-benefits {
        order: 2;
    }
    
    .hero-content,
    .ve-vnmax-content,
    .ai-acc-content {
        order: 1;
    }
    
    .hero-content h1 {
        font-size: 2.75rem;
    }
    
    .challenges-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .tab-grid {
        grid-template-columns: 1fr;
    }
    
    .tab-visual {
        margin-top: 30px;
    }
    
    .roadmap-line {
        left: 24px;
    }
    
    .roadmap-item {
        width: 100%;
        padding-left: 50px;
        padding-right: 0;
        justify-content: flex-start;
    }
    
    .roadmap-dot {
        left: 16px;
        right: auto;
    }
    
    .roadmap-item.right .roadmap-dot {
        left: 16px;
    }
    
    .roadmap-content {
        max-width: 100%;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 768px) {
    .main-nav {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--color-bg-dark);
        padding: 40px 24px;
        transition: var(--transition);
    }
    
    .main-nav.active {
        left: 0;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 24px;
        align-items: center;
    }
    
    .main-nav a {
        font-size: 1.25rem;
    }
    
    .mobile-nav-toggle {
        display: flex;
    }
    
    /* Hamburger to X Transformation */
    .mobile-nav-toggle.active .bar:nth-child(1) {
        transform: translateY(7px) rotate(45deg);
    }
    
    .mobile-nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }
    
    .mobile-nav-toggle.active .bar:nth-child(3) {
        transform: translateY(-7px) rotate(-45deg);
    }
    
    .header-cta .btn {
        display: none; /* Hide header contact button on mobile, keep floating buttons */
    }
    
    .challenges-grid {
        grid-template-columns: 1fr;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
        gap: 0;
    }
    
    .hero-actions {
        flex-direction: column;
    }
}