/* ========================================
   ANH KHANG CLEANROOM - LANDING PAGE STYLES
   Design System: Deep Blue & White Theme
   ======================================== */

/* ========================================
   1. CSS RESET & BASE STYLES
   ======================================== */

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

:root {
    /* Color Palette - Enhanced */
    --color-primary: #0099DD;
    --color-primary-light: #00B4FF;
    --color-primary-dark: #0077BB;
    --color-secondary: #FFFFFF;
    --color-accent-orange: #FF5722;
    --color-accent-red: #E65100;
    --color-accent-gold: #FFB300;
    --color-success: #2E7D32;
    --color-gray-50: #FAFAFA;
    --color-gray-100: #F5F5F5;
    --color-gray-200: #EEEEEE;
    --color-gray-600: #757575;
    --color-gray-800: #424242;
    --color-gray-900: #1A1A1A;

    /* Typography - Enhanced */
    --font-heading: 'Montserrat', 'Helvetica Neue', sans-serif;
    --font-body: 'Roboto', 'Arial', sans-serif;

    /* Font Sizes - Responsive */
    --font-size-base: 17px;
    --font-size-sm: 15px;
    --font-size-xs: 13px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    --font-size-4xl: 40px;
    --font-size-5xl: 48px;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-2xl: 64px;
    --spacing-3xl: 96px;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px rgba(0, 0, 0, 0.15);

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;

    /* Z-index */
    --z-sticky: 1000;
    --z-modal: 2000;
    --z-tooltip: 3000;
}

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-body);
    color: var(--color-gray-900);
    background-color: var(--color-secondary);
    line-height: 1.6;
    overflow-x: hidden;
}

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

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ========================================
   2. CONTAINER & LAYOUT
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* ========================================
   3. TYPOGRAPHY
   ======================================== */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 800;
    line-height: 1.25;
    color: var(--color-primary-dark);
    letter-spacing: -0.02em;
}

.section-title {
    font-size: var(--font-size-3xl);
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary-dark);
    font-weight: 900;
    letter-spacing: -0.03em;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
}

.section-subtitle {
    font-size: var(--font-size-lg);
    text-align: center;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-xl);
}

@media (max-width: 768px) {
    .section-title {
        font-size: var(--font-size-2xl);
    }

    .section-subtitle {
        font-size: var(--font-size-base);
    }
}

/* ========================================
   4. BUTTONS
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 14px 32px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: var(--font-size-base);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    text-align: center;
    cursor: pointer;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-accent-orange) 0%, var(--color-accent-red) 100%);
    color: var(--color-secondary);
    box-shadow: 0 8px 24px rgba(255, 87, 34, 0.35);
    font-weight: 700;
    letter-spacing: 0.02em;
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s;
}

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

.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 12px 32px rgba(255, 87, 34, 0.45);
}

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

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

.btn-large {
    padding: 18px 40px;
    font-size: var(--font-size-lg);
}

@media (max-width: 768px) {
    .btn {
        width: 100%;
        padding: 16px 24px;
    }

    .btn-large {
        padding: 18px 32px;
    }
}

/* ========================================
   5. SECTION 1: HERO SECTION
   ======================================== */

.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-secondary);
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg,
            rgba(0, 153, 221, 0.95),
            rgba(0, 180, 255, 0.93));
    z-index: 1;
}

.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    object-fit: cover;
}

.hero-image-fallback {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light)),
        url('assets/images/hero-bg.jpg') center/cover no-repeat;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: var(--spacing-2xl) 0;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 10px 24px;
    border-radius: var(--radius-2xl);
    margin-bottom: var(--spacing-md);
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: fadeInDown 1s ease-out;
}

.badge-icon {
    font-size: var(--font-size-xl);
}

.hero-title {
    font-size: var(--font-size-5xl);
    margin-bottom: var(--spacing-md);
    font-weight: 900;
    line-height: 1.15;
    letter-spacing: -0.02em;
    color: #FFFFFF;
    text-shadow: 0 4px 16px rgba(0, 0, 0, 0.7), 0 2px 8px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 1s ease-out 0.3s both;
}

.hero-title .highlight {
    color: #FFD700;
    font-weight: 900;
    text-shadow: 0 3px 10px rgba(255, 215, 0, 0.4);
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: #FFFFFF;
    opacity: 0.95;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 1s ease-out 0.5s both;
}

.hero-slogan {
    font-size: var(--font-size-xl);
    font-style: italic;
    font-weight: 500;
    margin-bottom: var(--spacing-xl);
    color: #FFD54F;
    opacity: 1;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
    animation: fadeInUp 1s ease-out 0.7s both;
}

.hero-benefits {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.9s both;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 14px 24px;
    border-radius: var(--spacing-lg);
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: all var(--transition-base);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    color: #FFFFFF;
}

.benefit-item:hover {
    background: rgba(255, 255, 255, 0.25);
    transform: translateY(-2px);
}

.benefit-icon {
    font-size: var(--font-size-xl);
}

.cta-main {
    animation: fadeInUp 1s ease-out 1.1s both;
    margin-bottom: var(--spacing-xs);
}

.hero-cta-note {
    font-size: var(--font-size-sm);
    color: rgba(255, 255, 255, 0.85);
    margin-top: var(--spacing-xs);
    font-style: italic;
}

.hero-scroll-indicator {
    margin-top: var(--spacing-xl);
    opacity: 0.7;
    animation: fadeIn 1s ease-out 1.5s both;
}

.scroll-arrow {
    font-size: var(--font-size-2xl);
    animation: bounce 2s infinite;
    margin-top: var(--spacing-xs);
}

@media (max-width: 768px) {
    .hero-title {
        font-size: var(--font-size-3xl);
    }

    .hero-subtitle {
        font-size: var(--font-size-base);
    }

    .hero-benefits {
        flex-direction: column;
        align-items: center;
    }
}

/* ========================================
   6. SECTION 2: SOCIAL PROOF
   ======================================== */

.social-proof-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-gray-50), var(--color-secondary));
}

.partners-logos {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
    align-items: center;
}

.logo-item {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    transition: transform var(--transition-base);
}

.logo-item img {
    max-width: 150px;
    height: auto;
    filter: grayscale(100%);
    opacity: 0.6;
    transition: all var(--transition-base);
}

.logo-item:hover img {
    filter: grayscale(0%);
    opacity: 1;
    transform: scale(1.1);
}

.stats-counter {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-2xl);
}

.stat-item {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--color-secondary);
    border-radius: var(--radius-xl);
    box-shadow: 0 8px 24px rgba(0, 38, 77, 0.12);
    transition: all var(--transition-base);
    border: 2px solid var(--color-gray-100);
}

.stat-item:hover {
    transform: translateY(-8px);
}

.stat-number {
    display: inline-block;
    font-size: 72px;
    font-weight: 900;
    color: var(--color-primary);
    font-family: var(--font-heading);
    line-height: 1;
    letter-spacing: -0.03em;
}

.stat-suffix {
    display: inline-block;
    font-size: 52px;
    font-weight: 900;
    color: var(--color-accent-orange);
    margin-left: 4px;
}

.stat-label {
    margin-top: var(--spacing-sm);
    font-size: var(--font-size-lg);
    color: var(--color-gray-600);
    font-weight: 500;
}

@media (max-width: 768px) {
    .stats-counter {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   7. SECTION 3: PAIN POINTS & SOLUTIONS
   ======================================== */

.solutions-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-secondary);
}

.comparison-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.comparison-column {
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
}

.problems-column {
    background: var(--color-gray-50);
    border: 2px solid var(--color-gray-200);
}

.solutions-column {
    background: linear-gradient(135deg, rgba(0, 102, 204, 0.05), rgba(0, 59, 115, 0.05));
    border: 2px solid var(--color-primary-light);
}

.column-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.comparison-items {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.comparison-item {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.icon-wrapper {
    flex-shrink: 0;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-2xl);
    border-radius: var(--radius-md);
}

.problem-icon {
    background: rgba(255, 0, 0, 0.1);
}

.solution-icon {
    background: rgba(40, 167, 69, 0.1);
}

.item-content h4 {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xs);
    color: var(--color-primary);
}

.item-content p {
    color: var(--color-gray-600);
    line-height: 1.6;
}

.cta-center {
    text-align: center;
    margin-top: var(--spacing-xl);
}

@media (max-width: 768px) {
    .comparison-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   8. SECTION 4: PROJECT SHOWCASE
   ======================================== */

.projects-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-gray-50), var(--color-secondary));
}

.projects-slider {
    position: relative;
    margin-top: var(--spacing-2xl);
}

.slider-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    overflow: hidden;
}

.project-card {
    background: var(--color-secondary);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: 0 8px 24px rgba(0, 38, 77, 0.12);
    transition: all var(--transition-base);
    border: 1px solid var(--color-gray-100);
}

.project-card:hover {
    transform: translateY(-12px);
    box-shadow: 0 16px 40px rgba(0, 38, 77, 0.2);
    border-color: var(--color-primary-light);
}

.project-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/10;
    background: var(--color-gray-200);
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

.project-card:hover .project-image img {
    transform: scale(1.1);
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 59, 115, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.view-details {
    color: var(--color-secondary);
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.project-info {
    padding: var(--spacing-lg);
}

.project-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.project-meta {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

.project-description {
    color: var(--color-gray-600);
    line-height: 1.6;
}

.slider-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-secondary);
    color: var(--color-primary);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: var(--font-size-3xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    z-index: 10;
    display: none;
    /* Hidden on desktop grid layout */
}

.slider-btn:hover {
    background: var(--color-primary);
    color: var(--color-secondary);
}

.slider-btn-prev {
    left: -25px;
}

.slider-btn-next {
    right: -25px;
}

.slider-dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-lg);
}

@media (max-width: 768px) {
    .slider-container {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   9. SECTION 5: WORKFLOW PROCESS
   ======================================== */

.workflow-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-primary);
    color: var(--color-secondary);
}

.workflow-section .section-title,
.workflow-section .section-subtitle {
    color: var(--color-secondary);
}

.workflow-timeline {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-2xl);
}

.workflow-step {
    text-align: center;
    padding: var(--spacing-xl);
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    border: 2px solid rgba(255, 255, 255, 0.2);
    transition: all var(--transition-base);
    position: relative;
}

.workflow-step:hover {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-8px);
}

.step-number {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--color-accent-orange), var(--color-accent-red));
    color: var(--color-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: var(--font-size-lg);
}

.step-icon {
    font-size: 48px;
    margin: var(--spacing-md) 0;
}

.step-title {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-sm);
    color: var(--color-secondary);
}

.step-description {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    line-height: 1.6;
}

@media (max-width: 768px) {
    .workflow-timeline {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   10. SECTION 6: TESTIMONIALS
   ======================================== */

.testimonials-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--color-gray-50), var(--color-secondary));
}

.testimonials-slider {
    position: relative;
    margin-top: var(--spacing-2xl);
}

.testimonials-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.testimonial-card {
    background: var(--color-secondary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base);
}

.testimonial-card:hover {
    transform: translateY(-8px);
}

.testimonial-image {
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-md);
    overflow: hidden;
    aspect-ratio: 16/10;
    background: var(--color-gray-100);
}

.testimonial-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.testimonial-content {
    position: relative;
}

.quote-icon {
    font-size: 64px;
    color: var(--color-primary-light);
    opacity: 0.2;
    line-height: 0;
    margin-bottom: var(--spacing-sm);
}

.testimonial-text {
    font-size: var(--font-size-lg);
    line-height: 1.8;
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-lg);
    font-style: italic;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.author-name {
    font-size: var(--font-size-lg);
    color: var(--color-primary);
    margin-bottom: 4px;
}

.author-position {
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
}

@media (max-width: 768px) {
    .testimonials-container {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   11. SECTION 7: CONTACT FORM
   ======================================== */

.contact-section {
    padding: var(--spacing-3xl) 0;
    background: var(--color-secondary);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-2xl);
}

.contact-info .section-title {
    text-align: left;
}

.promotion-box {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-secondary);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
}

.promotion-badge {
    display: inline-block;
    background: var(--color-accent-orange);
    padding: 6px 16px;
    border-radius: var(--radius-2xl);
    font-size: var(--font-size-sm);
    font-weight: 600;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}

.promotion-title {
    font-size: var(--font-size-2xl);
    margin-bottom: var(--spacing-sm);
    color: var(--color-secondary);
}

.promotion-text {
    line-height: 1.8;
    font-size: var(--font-size-base);
}

.highlight-price {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-accent-orange);
}

.contact-details {
    margin-top: var(--spacing-xl);
}

.contact-details h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.contact-item {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.contact-icon {
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
}

.contact-text {
    line-height: 1.6;
}

.contact-link {
    color: var(--color-primary);
    font-weight: 600;
}

.contact-link:hover {
    text-decoration: underline;
}

.contact-form-wrapper {
    background: var(--color-gray-50);
    padding: var(--spacing-xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
}

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

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

.form-group label {
    font-weight: 600;
    color: var(--color-gray-800);
    font-size: var(--font-size-base);
}

.required {
    color: var(--color-accent-orange);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 14px 16px;
    border: 2px solid var(--color-gray-200);
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: var(--font-size-base);
    transition: all var(--transition-base);
    background: var(--color-secondary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.1);
}

.form-group.error input,
.form-group.error select,
.form-group.error textarea {
    border-color: #dc3545;
}

.error-message {
    color: #dc3545;
    font-size: var(--font-size-sm);
    display: none;
}

.form-group.error .error-message {
    display: block;
}

.btn-submit {
    margin-top: var(--spacing-md);
}

.privacy-note {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--color-gray-600);
    margin-top: var(--spacing-sm);
}

.success-message {
    text-align: center;
    padding: var(--spacing-2xl);
    background: var(--color-success);
    color: var(--color-secondary);
    border-radius: var(--radius-xl);
}

.success-icon {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
}

.success-message h3 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

/* ========================================
   12. SECTION 8: FOOTER
   ======================================== */

.footer-section {
    background: var(--color-primary-dark);
    color: var(--color-secondary);
    padding: var(--spacing-2xl) 0 var(--spacing-md);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-logo img {
    max-width: 200px;
    margin-bottom: var(--spacing-md);
}

.footer-description {
    line-height: 1.8;
    opacity: 0.9;
    margin-bottom: var(--spacing-md);
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

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

.social-link:hover {
    background: var(--color-accent-orange);
    transform: translateY(-4px);
}

.footer-title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-md);
    color: var(--color-secondary);
}

.footer-links {
    list-style: none;
}

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

.footer-links a {
    opacity: 0.8;
    transition: opacity var(--transition-base);
}

.footer-links a:hover {
    opacity: 1;
    text-decoration: underline;
}

.footer-contact {
    list-style: none;
}

.footer-contact li {
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.certificates {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.cert-logo {
    max-width: 80px;
    height: auto;
    filter: brightness(0) invert(1);
    opacity: 0.7;
    transition: opacity var(--transition-base);
}

.cert-logo:hover {
    opacity: 1;
}

.footer-map {
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.8;
}

.footer-bottom .slogan {
    margin-top: var(--spacing-xs);
    font-style: italic;
    color: var(--color-accent-orange);
}

/* ========================================
   13. STICKY BUTTONS
   ======================================== */

.sticky-buttons {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    z-index: var(--z-sticky);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-base);
}

.sticky-buttons.visible {
    opacity: 1;
    transform: translateY(0);
}

.sticky-btn {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 14px 20px;
    border-radius: var(--radius-2xl);
    font-weight: 600;
    box-shadow: var(--shadow-xl);
    transition: all var(--transition-base);
    cursor: pointer;
}

.call-btn {
    background: var(--color-success);
    color: var(--color-secondary);
    animation: shake 2s infinite;
}

.call-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(40, 167, 69, 0.4);
}

.zalo-btn {
    background: #0068FF;
    color: var(--color-secondary);
}

.zalo-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 8px 20px rgba(0, 104, 255, 0.4);
}

.sticky-btn .btn-icon {
    font-size: var(--font-size-xl);
}

@media (max-width: 768px) {
    .sticky-buttons {
        right: var(--spacing-sm);
        bottom: var(--spacing-sm);
    }

    .sticky-btn .btn-label {
        display: none;
    }

    .sticky-btn {
        width: 56px;
        height: 56px;
        padding: 0;
        justify-content: center;
    }
}

/* ========================================
   14. BACK TO TOP BUTTON
   ======================================== */

.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    left: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background: var(--color-primary);
    color: var(--color-secondary);
    border-radius: 50%;
    font-size: var(--font-size-2xl);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transform: translateY(20px);
    transition: all var(--transition-base);
    z-index: var(--z-sticky);
    cursor: pointer;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-primary-light);
    transform: translateY(-4px);
}

/* ========================================
   15. ANIMATIONS
   ======================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

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

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

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

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

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0);
    }

    40% {
        transform: translateY(-10px);
    }

    60% {
        transform: translateY(-5px);
    }
}

@keyframes shake {

    0%,
    100% {
        transform: rotate(0deg);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: rotate(-5deg);
    }

    20%,
    40%,
    60%,
    80% {
        transform: rotate(5deg);
    }
}

/* ========================================
   16. UTILITY CLASSES
   ======================================== */

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

.mt-1 {
    margin-top: var(--spacing-xs);
}

.mt-2 {
    margin-top: var(--spacing-sm);
}

.mt-3 {
    margin-top: var(--spacing-md);
}

.mt-4 {
    margin-top: var(--spacing-lg);
}

.mb-1 {
    margin-bottom: var(--spacing-xs);
}

.mb-2 {
    margin-bottom: var(--spacing-sm);
}

.mb-3 {
    margin-bottom: var(--spacing-md);
}

.mb-4 {
    margin-bottom: var(--spacing-lg);
}

/* ========================================
   17. LOADING STATES
   ======================================== */

.loading {
    pointer-events: none;
    opacity: 0.6;
}

.loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 4px solid var(--color-gray-200);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}