@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@300;400;500;600;700;800&display=swap');

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

:root {
    /* Modern Color Palette */
    --primary-green: #10b981;
    --light-green: #34d399;
    --dark-green: #059669;
    --primary-blue: #3b82f6;
    --light-blue: #60a5fa;
    --dark-blue: #2563eb;
    --orange-gradient: linear-gradient(135deg, #f59e0b 0%, #f97316 100%);
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --blue-50: #eff6ff;
    --blue-100: #dbeafe;
    
    /* Semantic Colors */
    --text-primary: var(--white);
    --text-secondary: rgba(255, 255, 255, 0.9);
    --text-dark: var(--gray-800);
    --text-muted: var(--gray-600);
    --error-color: #ef4444;
    --success-color: #10b981;
    
    /* Background */
    --bg-hero: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --bg-light: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    --bg-white: var(--white);
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-white);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Banner */
.banner {
    background: var(--bg-white);
    padding: 1rem 0;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

/* Navigation Menu */
.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--text-dark);
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: -5px;
    left: 50%;
    background: var(--primary-green);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

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

.brand h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
}

/* Hero Banner Section */
.hero-banner {
    background: url('../assets/banner.jpg') center center/cover no-repeat;
    min-height: 400px;
    position: relative;
    overflow: hidden;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    display: flex;
    align-items: center;
    z-index: 1;
}

.banner-content {
    width: 100%;
    position: relative;
    z-index: 2;
}

.banner-left {
    max-width: 400px;
    color: var(--text-dark);
    text-align: left;
    padding-left: 4rem;
}

.banner-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.banner-subtitle {
    font-size: 1.4rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    font-weight: 600;
    color: var(--text-dark);
    text-shadow: none;
}

.banner-features {
    margin-bottom: 2.5rem;
}

.feature-item {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: rgba(255, 255, 255, 0.95);
    text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
}

.banner-cta-btn {
    background: linear-gradient(135deg, #f59e0b, #f97316);
    color: white;
    border: none;
    padding: 1.4rem 3rem;
    font-size: 1.2rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(245, 158, 11, 0.4);
    text-shadow: none;
    margin-top: 1rem;
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.banner-cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(245, 158, 11, 0.4);
    background: linear-gradient(135deg, #f97316, #ea580c);
}

/* Mobile Banner Content */
.mobile-banner-content {
    display: none;
    background: var(--bg-light);
    padding: 2rem 0;
    text-align: center;
}

.mobile-subtitle {
    font-size: 1.2rem;
    line-height: 1.6;
    margin-bottom: 2rem;
    color: var(--text-dark);
    font-weight: 500;
}

.mobile-cta-btn {
    background: linear-gradient(135deg, #f59e0b, #f97316);
    color: white;
    border: none;
    padding: 1.2rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(245, 158, 11, 0.3);
    text-decoration: none;
    display: inline-block;
    text-align: center;
}

.mobile-cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(245, 158, 11, 0.4);
    background: linear-gradient(135deg, #f97316, #ea580c);
}

@media (max-width: 768px) {
    .banner-subtitle,
    .banner-cta-btn {
        display: none;
    }
    
    .banner-left {
        display: none;
    }
    
    .hero-banner {
        min-height: 300px;
        background-position: right center;
    }
    
    .banner-overlay {
        min-height: 300px;
    }
    
    .mobile-banner-content {
        display: block;
    }
    
    .mobile-banner-overlay {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: transparent;
        display: flex;
        align-items: center;
        z-index: 1;
    }
}

/* Hero Section */
.hero {
    min-height: 80vh;
    background: var(--bg-light);
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding: 2rem 0;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="20" cy="20" r="1" fill="%2310b981" opacity="0.1"/><circle cx="80" cy="40" r="1" fill="%2310b981" opacity="0.1"/><circle cx="40" cy="80" r="1" fill="%2310b981" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
    pointer-events: none;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
    width: 100%;
    position: relative;
    z-index: 1;
}

.hero-content-centered {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: 100%;
    position: relative;
    z-index: 1;
    max-width: 1000px;
    margin: 0 auto;
}

.hero-header {
    margin-bottom: 3rem;
}

.hero-left {
    color: var(--text-dark);
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: var(--bg-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.3rem;
    line-height: 1.6;
    margin-bottom: 2.5rem;
    color: var(--gray-600);
    font-weight: 500;
}

/* QR Section */
.hero-right {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding-top: 2.5rem; /* Align with form container padding */
}

.qr-section {
    text-align: center;
    display: none; /* Hidden by default for mobile */
}

.qr-code {
    background: var(--white);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: var(--shadow-2xl);
    display: inline-block;
    border: 1px solid var(--gray-100);
}

.qr-placeholder {
    margin-bottom: 1.5rem;
}

.qr-text {
    color: var(--text-dark);
    font-weight: 600;
    font-size: 1.1rem;
    margin: 0;
}

/* Show QR only on desktop */
@media (min-width: 1024px) {
    .qr-section {
        display: block;
    }
}

.secondary-cta {
    margin-top: 2rem;
}

.download-btn {
    display: inline-block;
    padding: 1rem 2rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    width: 100%;
    max-width: 300px;
}

.download-btn.secondary {
    background: var(--gradient-accent);
    color: white;
    border: 2px solid var(--accent-color);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    opacity: 0.9;
}

/* Form Styles */
.form-container {
    max-width: 450px;
    background: var(--white);
    padding: 2.5rem;
    border-radius: 24px;
    box-shadow: var(--shadow-2xl);
    border: 1px solid var(--gray-100);
}

.form-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 2rem;
    background: var(--bg-hero);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.lead-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    position: relative;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 1.2rem 1.5rem;
    border: 2px solid var(--gray-200);
    border-radius: 16px;
    background: var(--gray-50);
    color: var(--text-dark);
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.3s ease;
    font-family: 'Be Vietnam Pro', sans-serif;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-green);
    background: var(--white);
    box-shadow: 0 0 0 4px rgba(16, 185, 129, 0.1);
    transform: translateY(-2px);
}

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

.form-group select {
    cursor: pointer;
}

.form-group select option {
    padding: 0.5rem;
}

.form-error {
    display: block;
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: 0.5rem;
    min-height: 1.25rem;
}

.submit-btn {
    width: 100%;
    padding: 1.4rem;
    background: var(--orange-gradient);
    color: var(--white);
    border: none;
    border-radius: 16px;
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    margin-top: 1rem;
    position: relative;
    overflow: hidden;
}

.submit-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.submit-btn:hover::before {
    left: 100%;
}

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

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.loading-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-left: 0.5rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.form-message {
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 8px;
    text-align: center;
    font-weight: 500;
    display: none;
}

.form-message.success {
    background: rgba(16, 185, 129, 0.1);
    color: #059669;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.form-message.error {
    background: rgba(239, 68, 68, 0.1);
    color: #dc2626;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Checkbox Styles */
.checkbox-group {
    margin-top: 1rem;
}

.checkbox-wrapper {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
}

.checkbox-wrapper input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin: 0;
    accent-color: var(--primary-green);
    cursor: pointer;
    flex-shrink: 0;
    margin-top: 2px;
}

.checkbox-wrapper label {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.4;
    cursor: pointer;
    flex: 1;
}

.checkbox-wrapper label a {
    color: var(--primary-green);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.checkbox-wrapper label a:hover {
    color: var(--dark-green);
    text-decoration: underline;
}

/* Footer */
.footer {
    background: #1f2937;
    padding: 3rem 0 1.5rem;
    margin-top: 0rem;
    color: #ffffff;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 2rem;
    margin-bottom: 1.5rem;
}

.footer-section h3 {
    color: #ffffff;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.8rem;
}

.footer-section h4 {
    color: #34d399;
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.footer-section p,
.footer-section a {
    color: #d1d5db;
    margin: 0.3rem 0;
    text-decoration: none;
    transition: color 0.3s ease;
    font-size: 0.9rem;
}

.footer-section a:hover {
    color: #34d399;
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 1.5rem;
    text-align: center;
    color: #9ca3af;
    font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
        align-items: center;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .form-container {
        max-width: none;
        padding: 2rem;
        margin: 0 1rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
        text-align: center;
    }
}

.offer-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.benefits-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin-bottom: 2rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.benefit-item {
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 500;
    transition: all 0.3s ease;
}

.benefit-item:hover {
    border-color: var(--accent-color);
    transform: scale(1.02);
}

.cta-button.large {
    padding: 1rem 2rem;
    font-size: 1.1rem;
    border-radius: 0.75rem;
    background: var(--gradient-accent);
    border: none;
    color: white;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s ease;
}

.cta-button.large:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* Download Section */
.download {
    padding: 5rem 0;
    background: var(--background-color);
}

.section-description {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.download-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.store-button {
    display: block;
    transition: transform 0.3s ease;
}

.store-button img {
    height: 60px;
    width: auto;
}

.store-button:hover {
    transform: scale(1.05);
}


/* Responsive Design */
@media (min-width: 640px) {
    .container {
        padding: 0 2rem;
    }
    
    .app-buttons {
        flex-direction: row;
    }
    
    .download-buttons {
        flex-direction: row;
        justify-content: center;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr 400px;
        gap: 4rem;
    }
    
    .hero-title {
        font-size: 3.5rem;
    }
    
    .footer-content {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

@media (min-width: 1024px) {
    .hero-title {
        font-size: 4rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Features Section */
.features-container {
    width: 100%;
    max-width: 900px;
}

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

.feature-item {
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--gray-100);
    transition: all 0.3s ease;
    overflow: hidden;
    height: 100%;
}

.feature-item:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-green);
}

.feature-content {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 2rem;
    height: 100%;
}

.feature-icon {
    color: var(--primary-green);
    flex-shrink: 0;
    background: rgba(16, 185, 129, 0.1);
    padding: 1rem;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-text {
    flex: 1;
}

.feature-item h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 0.75rem;
    line-height: 1.3;
    -webkit-font-smoothing: auto;
    -moz-osx-font-smoothing: auto;
    text-rendering: auto;
}

.feature-item p {
    font-size: 0.95rem;
    color: var(--gray-700);
    margin: 0;
    line-height: 1.5;
    -webkit-font-smoothing: auto;
    -moz-osx-font-smoothing: auto;
    text-rendering: auto;
}

.cta-section {
    text-align: center;
    margin-top: 2rem;
}

.primary-cta-btn {
    background: var(--orange-gradient);
    color: white;
    border: none;
    padding: 1.4rem 3rem;
    font-size: 1.2rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    text-decoration: none;
    display: inline-block;
    text-align: center;
    margin-bottom: 1rem;
}

.primary-cta-btn:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

.cta-note {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
    font-weight: 500;
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        gap: 2rem;
        text-align: center;
        align-items: center;
    }
    
    .hero-header {
        margin-bottom: 2rem;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .feature-content {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
        padding: 1.5rem;
    }
    
    .feature-icon {
        align-self: center;
    }
    
    .primary-cta-btn {
        padding: 1.2rem 2.5rem;
        font-size: 1.1rem;
    }
}

@media (max-width: 480px) {
    .feature-content {
        padding: 1.2rem;
    }
    
    .feature-item h3 {
        font-size: 1.1rem;
    }
    
    .feature-item p {
        font-size: 0.9rem;
    }
}

/* Phuchien Page Blue Theme */
body.phuchien-page {
    --primary-color: var(--primary-blue);
    --light-color: var(--light-blue);
    --dark-color: var(--dark-blue);
    --primary-green: var(--primary-blue);
    --light-green: var(--light-blue);
    --dark-green: var(--dark-blue);
    --bg-hero: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    --success-color: var(--primary-blue);
}

body.phuchien-page .hero-title {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

body.phuchien-page .form-title {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--dark-blue) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

body.phuchien-page .form-group input:focus,
body.phuchien-page .form-group select:focus {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.1);
}

body.phuchien-page .checkbox-wrapper label a {
    color: var(--primary-blue);
}

body.phuchien-page .checkbox-wrapper label a:hover {
    color: var(--dark-blue);
}

body.phuchien-page .checkbox-wrapper input[type="checkbox"] {
    accent-color: var(--primary-blue);
}

body.phuchien-page .form-message.success {
    background: rgba(59, 130, 246, 0.1);
    color: var(--dark-blue);
    border: 1px solid rgba(59, 130, 246, 0.2);
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

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

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }