* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* VNPay Brand Colors - Fintech Blue Theme */
    --primary-color: #005BAA;
    --primary-dark: #004a8f;
    --primary-light: #1a7acc;
    --secondary-color: #f5a623;
    --accent-red: #e74c3c;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --text-white: #ffffff;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --bg-gray: #f0f2f5;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --container-width: 1200px;

    /* Status Colors */
    --success-color: #059669;
    --success-light: rgba(5, 150, 105, 0.1);
    --error-color: #dc2626;
    --error-light: rgba(220, 38, 38, 0.1);
    --warning-color: #f59e0b;
    --warning-light: rgba(245, 158, 11, 0.1);
}

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

body {
    font-family: 'Montserrat', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

/* Touch-friendly: reduce tap highlight on mobile */
a,
button {
    -webkit-tap-highlight-color: rgba(0, 91, 170, 0.1);
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

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

ul {
    list-style: none;
}

/* Accessibility: screen-reader only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 32px;
    font-size: 16px;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    text-align: center;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    min-height: 48px;
    min-width: 48px;
    user-select: none;
    -webkit-tap-highlight-color: transparent;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-white);
    box-shadow: 0 4px 12px rgba(0, 91, 170, 0.25);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(0, 91, 170, 0.35);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:focus {
    outline: 3px solid rgba(0, 91, 170, 0.3);
    outline-offset: 2px;
}

.btn-primary:disabled {
    background-color: var(--bg-gray);
    color: var(--text-light);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: var(--text-white);
    box-shadow: 0 4px 12px rgba(245, 166, 35, 0.25);
}

.btn-secondary:hover {
    background-color: #e09612;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(245, 166, 35, 0.35);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-secondary:focus {
    outline: 3px solid rgba(245, 166, 35, 0.3);
    outline-offset: 2px;
}

.btn-secondary:disabled {
    background-color: var(--bg-gray);
    color: var(--text-light);
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-ghost {
    background: transparent;
    color: var(--primary-color);
    box-shadow: none;
}

.btn-ghost:hover {
    background-color: rgba(0, 91, 170, 0.08);
    transform: translateY(-2px);
    box-shadow: none;
}

.btn-ghost:active {
    transform: translateY(0);
}

.btn-ghost:focus {
    outline: 3px solid rgba(0, 91, 170, 0.3);
    outline-offset: 2px;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-submit-refund {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 4px 12px rgba(0, 91, 170, 0.25);
    }
    50% {
        box-shadow: 0 4px 20px rgba(0, 91, 170, 0.4);
    }
}

/* Loading spinner for buttons */
.btn-loading {
    pointer-events: none;
}

.btn-loading .spinner {
    display: inline-block;
    animation: spin 1s linear infinite;
}

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

.spinner {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    display: none;
}

.section-title {
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    font-weight: 300;
    color: var(--text-light);
    text-align: center;
    margin-bottom: 48px;
    letter-spacing: 0.01em;
}

.form-message {
    margin-top: 16px;
    padding: 12px 16px;
    border-radius: 8px;
    display: none;
}

.form-message.success {
    display: block;
    background-color: #d1fae5;
    color: #065f46;
    border: 1px solid #34d399;
}

.form-message.error {
    display: block;
    background-color: #fee2e2;
    color: #991b1b;
    border: 1px solid #f87171;
}

/* Header Styles */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: var(--shadow-md);
    backdrop-filter: blur(8px);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo-img {
    height: 40px;
    width: auto;
    max-width: 140px;
}

.logo-text {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.nav-link {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-dark);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.nav-link.disabled {
    color: var(--text-light);
    cursor: not-allowed;
    opacity: 0.6;
}

.nav-link.disabled:hover {
    color: var(--text-light);
}

.nav-link.disabled::after {
    display: none;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    border-radius: 8px;
    min-width: 48px;
    min-height: 48px;
    transition: all 0.3s ease;
}

.mobile-toggle:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.mobile-toggle:focus {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-dark);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border-radius: 2px;
}

/* Mobile toggle animations */
.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translateY(7px);
}

.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translateY(-7px);
}

/* Hero Section */
.hero {
    position: relative;
    padding: 100px 0 50px;
    background: linear-gradient(135deg, #f0f9f4 0%, #e8f5e9 100%);
    min-height: auto;
    overflow: hidden;
}

.hero>.container {
    max-width: 100%;
    padding: 0;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.08;
}

.hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-content {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 100%;
}

/* Hero Banner with Overlay */
.hero-banner {
    position: relative;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 91, 170, 0.25);
    margin: 0 auto 40px;
    width: 100%;
    max-width: 100%;
}

.hero-banner>img {
    width: 100%;
    height: auto;
    display: block;
    min-height: 500px;
    object-fit: cover;
    object-position: center top;
}

.hero-banner-overlay {
    position: relative;
    width: 100%;
}

.hero-banner-overlay .hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    color: #1f2937;
    margin-bottom: 16px;
    text-shadow: 2px 2px 8px rgba(255, 255, 255, 0.5), 0 0 30px rgba(255, 255, 255, 0.3);
    line-height: 1.15;
    letter-spacing: 2px;
    animation: slideInDown 0.8s ease-out;
}

.hero-banner-overlay .hero-subtitle {
    font-size: 1.6rem;
    color: #374151;
    margin-bottom: 32px;
    font-weight: 500;
    text-shadow: 1px 1px 4px rgba(255, 255, 255, 0.8);
    animation: slideInUp 0.8s ease-out 0.2s both;
}

.hero-banner-overlay .hero-cta {
    margin-bottom: 0;
}

.hero-banner-overlay .btn-primary {
    background-color: #f5a623;
    color: #fff;
    padding: 18px 56px;
    font-size: 1.3rem;
    font-weight: 700;
    border-radius: 12px;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.hero-banner-overlay .btn-primary:hover {
    background-color: #e09612;
    transform: translateY(-3px);
    box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 16px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--primary-color);
    margin-bottom: 32px;
    font-weight: 500;
}

.hero-cta {
    margin-bottom: 32px;
}

.hero-info {
    text-align: left;
    background-color: var(--bg-white);
    padding: 24px 32px;
    border-radius: 12px;
    box-shadow: var(--shadow-md);
}

.hero-info p {
    margin-bottom: 12px;
    color: var(--text-dark);
}

.hero-info p:last-child {
    margin-bottom: 0;
}

.hero-info .highlight {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.125rem;
    margin-top: 16px;
    padding-top: 16px;
    border-top: 1px solid var(--border-color);
}

/* About Section */
.about {
    padding: 80px 0;
    background-color: #fff;
    position: relative;
    overflow: hidden;
}

.about::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 91, 170, 0.05) 0%, transparent 70%);
    border-radius: 50%;
}

.about-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto 56px;
    position: relative;
    z-index: 1;
}

.about-description {
    font-size: 1.35rem;
    color: var(--primary-color);
    font-weight: 700;
    margin-bottom: 20px;
}

.about-detail {
    font-size: 1.05rem;
    color: var(--text-light);
    line-height: 1.85;
}

.about-section {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    padding: 48px 40px;
    background: linear-gradient(135deg, #f8fafc 0%, #eef2f6 100%);
    border-radius: 20px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
    position: relative;
    z-index: 1;
}

.about-heading {
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 20px;
}

.about-text {
    color: var(--text-light);
    margin-bottom: 20px;
    line-height: 1.8;
    font-size: 1.05rem;
}

.about-tagline {
    font-size: 1.2rem;
    color: var(--primary-color);
    font-weight: 700;
    font-style: italic;
    padding: 16px 24px;
    background: linear-gradient(135deg, rgba(0, 91, 170, 0.1) 0%, rgba(0, 91, 170, 0.05) 100%);
    border-radius: 12px;
    display: inline-block;
}

/* Services Section */
.services {
    padding: 80px 0;
    background: linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    margin-top: 48px;
}

.service-card {
    background-color: #fff;
    padding: 40px 28px;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.service-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 20px 50px rgba(0, 91, 170, 0.15);
}

.service-card:hover::before {
    transform: scaleX(1);
}

/* Disabled Service Card */
.service-card-disabled {
    opacity: 0.6;
    background: linear-gradient(135deg, #f9fafb 0%, #f3f4f6 100%);
}

.service-card-disabled::before {
    display: none;
}

.service-card-disabled:hover {
    transform: none;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
}

.service-card-disabled .service-icon {
    color: #9ca3af;
}

.service-card-disabled .service-icon svg {
    stroke: #9ca3af;
}

.service-badge {
    display: inline-block;
    padding: 6px 16px;
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #92400e;
    font-size: 12px;
    font-weight: 600;
    border-radius: 20px;
    margin-top: 12px;
}

.service-image {
    margin-bottom: 24px;
    border-radius: 12px;
    overflow: hidden;
    display: block;
    width: 100%;
}

.service-image img {
    width: 100%;
    height: 180px;
    object-fit: cover;
    border-radius: 12px;
}

.service-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #005BAA 0%, #004a8f 100%);
    border-radius: 20px;
    color: #fff;
    transition: all 0.3s ease;
    position: relative;
    z-index: 2;
    box-shadow: 0 6px 20px rgba(0, 91, 170, 0.3);
}

.service-icon--blue {
    background: linear-gradient(135deg, #005BAA 0%, #1a7acc 100%);
    box-shadow: 0 6px 20px rgba(0, 91, 170, 0.35);
}

.service-icon--green {
    background: linear-gradient(135deg, var(--success-color) 0%, #10b981 100%);
    box-shadow: 0 6px 20px rgba(5, 150, 105, 0.35);
}

.service-icon--orange {
    background: linear-gradient(135deg, #f5a623 0%, #f97316 100%);
    box-shadow: 0 6px 20px rgba(245, 166, 35, 0.35);
}

.service-card:hover .service-icon--blue {
    background: linear-gradient(135deg, #004a8f 0%, #005BAA 100%);
    transform: scale(1.1) rotate(-5deg);
}

.service-card:hover .service-icon--green {
    background: linear-gradient(135deg, #047857 0%, var(--success-color) 100%);
    transform: scale(1.1) rotate(-5deg);
}

.service-card:hover .service-icon--orange {
    background: linear-gradient(135deg, #e09612 0%, #f5a623 100%);
    transform: scale(1.1) rotate(-5deg);
}

.service-card:hover .service-icon {
    transform: scale(1.1) rotate(-5deg);
}

.service-icon svg {
    width: 36px;
    height: 36px;
}

.service-title {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 12px;
    margin-top: 8px;
}

.service-description {
    font-size: 1rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 16px;
}

.service-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: #005BAA;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 0.9375rem;
    margin-top: 12px;
    padding: 8px 16px;
    border-radius: 8px;
    background: rgba(0, 91, 170, 0.06);
}

.service-link:hover {
    color: var(--primary-dark);
    background: rgba(0, 91, 170, 0.13);
    gap: 10px;
    text-decoration: none;
}

/* Newsletter Section */
.newsletter {
    padding: 80px 0;
    background: linear-gradient(135deg, #005BAA 0%, #003d73 100%);
    position: relative;
    overflow: hidden;
}

.newsletter::before {
    content: '';
    position: absolute;
    top: -100px;
    left: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.newsletter::after {
    content: '';
    position: absolute;
    bottom: -100px;
    right: -100px;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.newsletter-box {
    max-width: 650px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.newsletter-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 16px;
}

.newsletter-description {
    font-size: 1.15rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 36px;
}

.newsletter-form {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
    justify-content: center;
}

.newsletter-input {
    flex: 1;
    min-width: 220px;
    padding: 16px 24px;
    font-size: 1rem;
    border: none;
    border-radius: 12px;
    background-color: rgba(255, 255, 255, 0.95);
    color: var(--text-dark);
    transition: all 0.3s ease;
}

.newsletter-input::placeholder {
    color: var(--text-light);
}

.newsletter-input:focus {
    outline: none;
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.3);
    background-color: #fff;
}

.newsletter .btn-secondary {
    padding: 16px 36px;
    font-size: 1.05rem;
    border-radius: 12px;
}

/* Contact Section */
.contact {
    padding: 80px 0;
    background-color: var(--bg-white);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    margin-top: 48px;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    padding: 20px;
    background-color: var(--bg-light);
    border-radius: 8px;
}

.contact-heading {
    font-size: 1rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.contact-item p {
    font-size: 0.9375rem;
    color: var(--text-dark);
    line-height: 1.6;
}

.contact-form-wrapper {
    padding: 32px;
    background-color: var(--bg-light);
    border-radius: 12px;
}

.form-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 24px;
}

.form-group {
    margin-bottom: 16px;
}

.form-input {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background-color: var(--bg-white);
    color: var(--text-dark);
    transition: var(--transition);
}

.form-input::placeholder {
    color: var(--text-light);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(26, 127, 55, 0.1);
}

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

/* Refund Section */
.refund {
    padding: 80px 0;
    background: linear-gradient(180deg, #f8fafc 0%, #e2e8f0 100%);
}

.refund-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.refund-description {
    font-size: 1.15rem;
    color: var(--text-light);
    margin-bottom: 40px;
    line-height: 1.75;
}

.refund-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 40px;
    text-align: left;
}

.refund-feature {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 20px 24px;
    background-color: #fff;
    border-radius: 14px;
    font-size: 1.05rem;
    color: var(--text-dark);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    transition: all 0.3s ease;
}

.refund-feature:hover {
    transform: translateX(8px);
    box-shadow: 0 8px 25px rgba(0, 91, 170, 0.12);
}

.refund-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    color: var(--text-white);
    border-radius: 50%;
    font-size: 1rem;
    font-weight: 700;
    flex-shrink: 0;
}

.refund .btn-primary {
    padding: 16px 48px;
    font-size: 1.1rem;
    border-radius: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* Promo Section (BVBank x Digimi) */
.promo {
    padding: 80px 0;
    background-color: var(--bg-white);
}

.promo-banner {
    max-width: 900px;
    margin: 32px auto 0;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background-color: var(--bg-light);
}

.promo-banner img {
    width: 100%;
    height: auto;
    display: block;
}

/* Video Section */
.video-section {
    padding: 80px 0;
    background-color: var(--bg-white);
}

.video-wrapper {
    position: relative;
    max-width: 800px;
    margin: 48px auto 0;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background-color: var(--text-dark);
}

.video-frame {
    width: 100%;
    height: 450px;
    display: block;
}

/* Footer */
.footer {
    background-color: #0d1b2a;
    color: #ffffff;
}

.footer-main {
    padding: 60px 0 40px;
    background: linear-gradient(180deg, #0d1b2a 0%, #1b263b 100%);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 40px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo-img {
    height: 36px;
    width: auto;
}

.footer-logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.footer-description {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.footer-social {
    display: flex;
    gap: 12px;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: #ffffff;
    transition: var(--transition);
}

.social-link:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.footer-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: #ffffff;
    margin-bottom: 20px;
    position: relative;
    padding-bottom: 12px;
}

.footer-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 3px;
    background-color: var(--primary-color);
    border-radius: 2px;
}

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

.footer-list a {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9375rem;
    transition: var(--transition);
    display: inline-block;
}

.footer-list a:hover {
    color: var(--primary-color);
    transform: translateX(5px);
}

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

.contact-row {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9375rem;
    line-height: 1.5;
}

.contact-row svg {
    flex-shrink: 0;
    color: var(--primary-color);
    margin-top: 2px;
}

.footer-bottom {
    background-color: #061220;
    padding: 20px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-copyright {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
}

.footer-certificate {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8125rem;
    text-align: right;
}

/* ========== Mobile First & Responsive ========== */
/* Safe area for notched devices */
@supports (padding: env(safe-area-inset-top)) {
    .header {
        padding-left: env(safe-area-inset-left);
        padding-right: env(safe-area-inset-right);
    }

    .footer-main .container {
        padding-left: calc(20px + env(safe-area-inset-left));
        padding-right: calc(20px + env(safe-area-inset-right));
    }
}

@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .container {
        padding-left: 16px;
        padding-right: 16px;
    }

    .floating-contact {
        display: block;
    }

    .header .container {
        height: 56px;
        padding-left: 16px;
        padding-right: 16px;
    }

    .logo-img {
        height: 34px;
    }

    .mobile-toggle {
        display: flex;
        padding: 10px;
        min-width: 44px;
        min-height: 44px;
        justify-content: center;
        align-items: center;
    }

    .mobile-toggle span {
        width: 22px;
    }

    .nav {
        position: fixed;
        top: 56px;
        left: 0;
        right: 0;
        background-color: var(--bg-white);
        padding: 20px 16px;
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        max-height: calc(100vh - 56px);
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: 0;
    }

    .nav-list li a {
        display: block;
        padding: 14px 16px;
        min-height: 48px;
        font-size: 1rem;
    }

    .hero {
        padding: 76px 0 40px;
    }

    .hero>.container {
        padding: 0 12px;
    }

    .hero-banner {
        max-width: 100%;
        border-radius: 12px;
        margin-bottom: 24px;
    }

    .hero-banner>img,
    .hero-banner-overlay img {
        min-height: 200px;
        object-fit: cover;
    }

    .hero-banner-overlay {
        padding: 20px 16px;
    }

    .hero-banner-overlay .hero-title {
        font-size: 1.5rem;
    }

    .hero-banner-overlay .hero-subtitle {
        font-size: 0.9375rem;
    }

    .hero-banner-overlay .btn-primary {
        padding: 14px 28px;
        font-size: 0.9375rem;
        min-height: 48px;
    }

    .section-title {
        font-size: 1.5rem;
        margin-bottom: 12px;
    }

    .section-subtitle {
        font-size: 1rem;
        margin-bottom: 32px;
    }

    .about {
        padding: 48px 0;
    }

    .about-content {
        margin-bottom: 36px;
    }

    .about-description {
        font-size: 1.15rem;
    }

    .about-section {
        padding: 28px 20px;
        border-radius: 12px;
    }

    .about-heading {
        font-size: 1.25rem;
    }

    .services {
        padding: 48px 0;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 28px;
    }

    .service-card {
        padding: 28px 20px;
    }

    .service-image img {
        height: 140px;
    }

    .service-icon {
        width: 52px;
        height: 52px;
        margin-top: -26px;
    }

    .service-icon svg {
        width: 24px;
        height: 24px;
    }

    .refund {
        padding: 48px 0;
    }

    .refund-features {
        grid-template-columns: 1fr;
        gap: 12px;
        margin-bottom: 28px;
    }

    .refund-feature {
        padding: 16px;
        font-size: 0.9375rem;
    }

    .refund .btn-primary {
        padding: 14px 32px;
        font-size: 1rem;
        min-height: 48px;
        width: 100%;
    }

    .promo {
        padding: 48px 0;
    }

    .promo-banner {
        margin-top: 24px;
        border-radius: 12px;
    }

    .video-section {
        padding: 48px 0;
    }

    .video-wrapper {
        margin-top: 28px;
        border-radius: 12px;
    }

    .video-frame {
        height: 220px;
    }

    .newsletter {
        padding: 48px 0;
    }

    .newsletter-title {
        font-size: 1.5rem;
    }

    .newsletter-description {
        font-size: 0.9375rem;
        margin-bottom: 24px;
    }

    .newsletter-form {
        flex-direction: column;
        gap: 12px;
    }

    .newsletter-input {
        min-width: 100%;
        padding: 14px 18px;
        font-size: 16px;
        min-height: 48px;
    }

    .newsletter .btn-secondary {
        padding: 14px 28px;
        min-height: 48px;
    }

    .contact {
        padding: 48px 0;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 28px;
        margin-top: 28px;
    }

    .contact-form-wrapper {
        padding: 24px 20px;
    }

    .form-input {
        padding: 14px 16px;
        min-height: 48px;
        font-size: 16px;
    }

    .btn {
        min-height: 48px;
        padding: 14px 24px;
        font-size: 0.9375rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer-main {
        padding: 36px 0 24px;
    }

    .footer-bottom {
        padding: 16px;
    }

    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
        gap: 12px;
    }

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

@media (max-width: 480px) {
    .container {
        padding-left: 14px;
        padding-right: 14px;
    }

    .section-title {
        font-size: 1.35rem;
    }

    .hero {
        padding: 68px 0 32px;
    }

    .hero-banner-overlay img {
        min-height: 160px;
    }

    .hero-banner-overlay .hero-title {
        font-size: 1.35rem;
    }

    .hero-banner-overlay .hero-subtitle {
        font-size: 0.875rem;
    }

    .hero-banner-overlay .btn-primary {
        padding: 12px 24px;
    }

    .about-section {
        padding: 24px 16px;
    }

    .about-heading {
        font-size: 1.15rem;
    }

    .service-card {
        padding: 24px 16px;
    }

    .contact-form-wrapper {
        padding: 20px 16px;
    }

    .form-input {
        font-size: 16px;
    }

    .video-frame {
        height: 200px;
    }

    .promo-banner {
        margin-top: 20px;
    }

    .refund-feature {
        padding: 14px;
    }
}

/* Màn hình rất nhỏ (iPhone SE, etc.) */
@media (max-width: 375px) {
    .container {
        padding-left: 12px;
        padding-right: 12px;
    }

    .section-title {
        font-size: 1.25rem;
    }

    .hero-banner-overlay .hero-title {
        font-size: 1.2rem;
    }

    .newsletter-title {
        font-size: 1.35rem;
    }

    .footer-description {
        font-size: 0.875rem;
    }
}

/* Animation for form submission */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }

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

.form-message.success,
.form-message.error {
    animation: fadeIn 0.3s ease;
}

/* Hero Banner Animations */
@keyframes slideInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }

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

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

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

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }
}

.hero-banner-overlay .hero-cta {
    animation: slideInUp 0.8s ease-out 0.4s both;
}

.hero-banner-overlay .btn-primary {
    animation: pulse 2s ease-in-out infinite;
}

/* =========================================
   Contact Icon Styles
   ========================================= */
.contact-heading {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.contact-icon {
    color: var(--primary-color);
    flex-shrink: 0;
}

.contact-item p a {
    color: var(--primary-color);
    font-weight: 500;
}

.contact-item p a:hover {
    text-decoration: underline;
}

/* =========================================
   Refund Icon - SVG support
   ========================================= */
.refund-icon svg {
    display: block;
}

/* =========================================
   Support Icon - SVG color theming
   ========================================= */
.support-icon.phone {
    background: rgba(0, 91, 170, 0.12);
    color: #005BAA;
}

.support-icon.email {
    background: rgba(234, 67, 53, 0.12);
    color: #EA4335;
}

.support-icon.chat {
    background: rgba(5, 150, 105, 0.12);
    color: var(--success-color);
}

/* =========================================
   Mobile Responsive — Additional Fixes
   ========================================= */

/* Tablet: ≤ 1024px */
@media (max-width: 1024px) {
    .services-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 24px;
    }

    .refund-features {
        grid-template-columns: 1fr;
    }

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

    .video-frame {
        height: 360px;
    }
}

/* Mobile: ≤ 768px */
@media (max-width: 768px) {

    /* Typography */
    .section-title {
        font-size: 1.6rem;
    }

    .section-subtitle {
        font-size: 1rem;
        margin-bottom: 32px;
    }

    /* Services */
    .services-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    .service-card {
        padding: 28px 20px;
    }

    .service-icon {
        width: 60px;
        height: 60px;
    }

    .service-icon svg {
        width: 28px;
        height: 28px;
    }

    /* Refund features */
    .refund-features {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .refund-feature {
        padding: 14px 18px;
        font-size: 0.9375rem;
    }

    /* Newsletter */
    .newsletter-form {
        flex-direction: column;
        gap: 12px;
    }

    .newsletter-input {
        width: 100%;
    }

    .newsletter-form .btn {
        width: 100%;
    }

    /* Contact */
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    /* Video */
    .video-frame {
        height: 220px;
    }

    /* Footer grid */
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 28px;
    }

    .footer-bottom-content {
        flex-direction: column;
        text-align: center;
        gap: 8px;
    }

    /* Hero adjustments */
    .hero-banner>img {
        min-height: 220px;
    }

    .about {
        padding: 48px 0;
    }

    .services,
    .refund,
    .promo,
    .video-section,
    .newsletter,
    .contact {
        padding: 48px 0;
    }
}

/* Small mobile: ≤ 480px */
@media (max-width: 480px) {
    .container {
        padding: 0 14px;
    }

    .section-title {
        font-size: 1.4rem;
    }

    .btn {
        padding: 11px 24px;
        font-size: 0.9375rem;
    }

    .service-link {
        font-size: 0.875rem;
        padding: 6px 12px;
    }

    /* Footer single column */
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .footer-main {
        padding: 40px 0 28px;
    }

    .footer-bottom-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }

    .footer-certificate {
        font-size: 0.75rem;
    }
}