/* ============================================
   KIẾN VIỆT - Premium Construction Website
   Design System & Styling
   ============================================ */

/* --- Smooth Scroll --- */
html {
    scroll-behavior: smooth;
}

/* --- CSS Variables --- */
:root {
    --kv-blue-primary: #0052A5;
    --kv-blue-dark: #003B75;
    --kv-blue-light: #E8F0FE;
    --kv-red-primary: #D32F2F;
    --kv-red-light: #FFEBEE;
    --kv-green-primary: #2E7D32;
    --kv-green-light: #E8F5E9;
    --kv-gold: #C6993E;
    --kv-gold-light: #FFF8E1;

    --kv-dark-900: #0F1419;
    --kv-dark-800: #1A1F2E;
    --kv-dark-700: #2D3348;
    --kv-dark-600: #3D4460;
    --kv-gray-500: #6B7280;
    --kv-gray-400: #9CA3AF;
    --kv-gray-300: #D1D5DB;
    --kv-gray-200: #E5E7EB;
    --kv-gray-100: #F3F4F6;
    --kv-white: #FFFFFF;

    --kv-font-primary: 'Inter', -apple-system, sans-serif;
    --kv-font-display: 'Playfair Display', Georgia, serif;

    --kv-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --kv-shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --kv-shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.12);
    --kv-shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.15);

    --kv-radius-sm: 6px;
    --kv-radius-md: 12px;
    --kv-radius-lg: 20px;
    --kv-radius-xl: 28px;

    --kv-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* --- KV Base Overrides --- */
.kv-page {
    font-family: var(--kv-font-primary);
    color: var(--kv-dark-800);
    line-height: 1.7;
    overflow-x: hidden;
    background: var(--kv-white);
}

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

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

.kv-page ul {
    list-style: none;
}

/* --- Section Common --- */
.kv-section {
    padding: 100px 0;
}

.kv-section-header {
    text-align: center;
    margin-bottom: 60px;
}

.kv-section-tag {
    display: inline-block;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 3px;
    color: var(--kv-blue-primary);
    background: var(--kv-blue-light);
    padding: 6px 20px;
    border-radius: 50px;
    margin-bottom: 16px;
}

.kv-section-title {
    font-family: var(--kv-font-display);
    font-size: 2.6rem;
    font-weight: 700;
    color: var(--kv-dark-900);
    margin-bottom: 12px;
}

.kv-text-accent {
    color: var(--kv-blue-primary);
}

.kv-text-red {
    color: var(--kv-red-primary);
}

.kv-section-divider {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--kv-blue-primary), var(--kv-red-primary));
    margin: 16px auto;
    border-radius: 2px;
}

.kv-section-desc {
    max-width: 600px;
    margin: 0 auto;
    color: var(--kv-gray-500);
    font-size: 1.05rem;
}

/* --- Buttons --- */
.kv-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    font-size: 0.95rem;
    font-weight: 600;
    border: 2px solid transparent;
    border-radius: var(--kv-radius-sm);
    cursor: pointer;
    transition: var(--kv-transition);
    font-family: var(--kv-font-primary);
    text-decoration: none;
}

.kv-btn-primary {
    background: linear-gradient(135deg, var(--kv-blue-primary), var(--kv-blue-dark));
    color: var(--kv-white);
    border-color: var(--kv-blue-primary);
}

.kv-btn-primary:hover {
    background: linear-gradient(135deg, var(--kv-blue-dark), #002855);
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(0, 82, 165, 0.35);
    color: var(--kv-white);
}

.kv-btn-outline {
    background: transparent;
    color: var(--kv-blue-primary);
    border-color: var(--kv-blue-primary);
}

.kv-btn-outline:hover {
    background: var(--kv-blue-primary);
    color: var(--kv-white);
    border-color: var(--kv-blue-primary);
    transform: translateY(-2px);
}

.kv-btn-full {
    width: 100%;
    justify-content: center;
}

/* ============================================
   HEADER
   ============================================ */
.kv-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    transition: var(--kv-transition);
}

.kv-header.scrolled {
    box-shadow: var(--kv-shadow-md);
}

.kv-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 75px;
}

.kv-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
}

.kv-logo-img {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.kv-logo-text {
    display: flex;
    flex-direction: column;
}

.kv-logo-name {
    font-family: var(--kv-font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--kv-blue-primary);
    line-height: 1.2;
}

.kv-logo-slogan {
    font-size: 0.65rem;
    color: var(--kv-blue-primary);
    letter-spacing: 1px;
    font-weight: 500;
}

.kv-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.kv-nav-link {
    padding: 8px 16px;
    font-size: 0.88rem;
    font-weight: 500;
    color: var(--kv-dark-700);
    border-radius: var(--kv-radius-sm);
    position: relative;
    text-decoration: none;
}

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

.kv-nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.kv-nav-toggle span {
    width: 24px;
    height: 2.5px;
    background: var(--kv-dark-800);
    border-radius: 2px;
    transition: var(--kv-transition);
}

/* --- Dropdown Menu --- */
.kv-nav-dropdown {
    position: relative;
}

.kv-nav-link-dropdown {
    display: flex;
    align-items: center;
    gap: 6px;
}

.kv-dropdown-arrow {
    font-size: 0.6rem;
    transition: transform 0.3s ease;
}

.kv-nav-dropdown:hover .kv-dropdown-arrow {
    transform: rotate(180deg);
}

.kv-dropdown-menu {
    position: absolute;
    color: #fff;
    top: 100%;
    left: 0;
    min-width: 240px;
    background: linear-gradient(180deg, var(--kv-blue-primary), var(--kv-blue-dark));
    border-radius: 0 0 var(--kv-radius-sm) var(--kv-radius-sm);
    box-shadow: 0 12px 30px rgba(0, 52, 120, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 1000;
    overflow: hidden;
    padding: 0;
    margin: 0;
    list-style: none;
}

.kv-nav-dropdown:hover .kv-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.kv-dropdown-item {
    display: block;
    padding: 14px 24px;
    color: var(--kv-white);
    font-size: 0.88rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--kv-transition);
    text-decoration: none;
}

.kv-dropdown-item:last-child {
    border-bottom: none;
}

.kv-dropdown-item:hover {
    background: rgba(255, 255, 255, 0.12);
    padding-left: 30px;
    color: var(--kv-white);
}

/* ============================================
   HERO
   ============================================ */
.kv-hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.kv-hero-bg {
    position: absolute;
    inset: 0;
}

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

/* Hero Slider */
.kv-hero-slider {
    position: absolute;
    inset: 0;
}

.kv-hero-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 1.2s ease, transform 6s ease;
    transform: scale(1.05);
}

.kv-hero-slide.active {
    opacity: 1;
    transform: scale(1);
}

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

/* Hero Dots */
.kv-hero-dots {
    position: absolute;
    bottom: 70px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3;
    display: flex;
    gap: 10px;
}

.kv-hero-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid var(--kv-blue-primary);
    background: transparent;
    cursor: pointer;
    transition: all 0.3s ease;
    padding: 0;
}

.kv-hero-dot:hover {
    background: rgba(0, 82, 165, 0.4);
}

.kv-hero-dot.active {
    background: var(--kv-blue-primary);
    transform: scale(1.2);
    box-shadow: 0 0 8px rgba(0, 82, 165, 0.5);
}

.kv-hero-overlay {
    position: absolute;
    inset: 0;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(2px);
}

.kv-hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    color: var(--kv-dark-800);
    max-width: 800px;
    padding: 0 20px;
    animation: kvFadeInUp 1s ease-out;
}

.kv-hero-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 3px;
    padding: 8px 24px;
    border: 1px solid rgba(0, 82, 165, 0.3);
    border-radius: 50px;
    margin-bottom: 24px;
    background: rgba(0, 82, 165, 0.08);
    color: var(--kv-blue-primary);
}

.kv-hero-title-main {
    display: block;
    font-family: var(--kv-font-display);
    font-size: 4.5rem;
    font-weight: 700;
    letter-spacing: 5px;
    margin-bottom: 8px;
    color: var(--kv-blue-primary);
    text-shadow: none;
}

.kv-hero-title-sub {
    display: block;
    font-size: 1.3rem;
    font-weight: 300;
    letter-spacing: 5px;
    font-style: italic;
    line-height: 1.2;
    color: var(--kv-blue-primary);
    opacity: 1;
}

.kv-hero-description {
    font-size: 1.15rem;
    margin: 28px 0 36px;
    line-height: 1.8;
    color: var(--kv-dark-700);
}

.kv-hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    color: #fff;
}

.kv-hero-scroll {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.kv-hero-scroll a {
    color: var(--kv-blue-primary);
    font-size: 1.2rem;
    animation: kvBounce 2s infinite;
    opacity: 0.7;
}

@keyframes kvBounce {

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

    40% {
        transform: translateY(-12px);
    }

    60% {
        transform: translateY(-6px);
    }
}

@keyframes kvFadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }

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

/* ============================================
   STATS BAR
   ============================================ */
.kv-stats-bar {
    background: linear-gradient(135deg, var(--kv-blue-primary), var(--kv-blue-dark));
    padding: 0;
    position: relative;
    z-index: 10;
}

.kv-stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
}

.kv-stat-item {
    text-align: center;
    padding: 40px 20px;
    color: var(--kv-white);
    position: relative;
}

.kv-stat-item:not(:last-child)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 20%;
    height: 60%;
    width: 1px;
    background: rgba(255, 255, 255, 0.2);
}

.kv-stat-icon {
    font-size: 1.8rem;
    margin-bottom: 10px;
    opacity: 0.8;
}

.kv-stat-number {
    font-family: var(--kv-font-display);
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.kv-stat-number::after {
    content: '+';
}

.kv-stat-label {
    font-size: 0.85rem;
    opacity: 0.8;
    letter-spacing: 0.5px;
}

/* ============================================
   ABOUT
   ============================================ */
.kv-about {
    background: var(--kv-white);
}

.kv-about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.kv-about-image {
    position: relative;
    border-radius: var(--kv-radius-lg);
    overflow: hidden;
    box-shadow: var(--kv-shadow-xl);
}

.kv-about-image img {
    width: 100%;
    height: 450px;
    object-fit: cover;
}

.kv-about-image-badge {
    position: absolute;
    bottom: 20px;
    right: 20px;
    background: linear-gradient(135deg, var(--kv-blue-primary), var(--kv-blue-dark));
    color: var(--kv-white);
    padding: 20px 28px;
    border-radius: var(--kv-radius-md);
    text-align: center;
    box-shadow: var(--kv-shadow-lg);
}

.kv-badge-number {
    display: block;
    font-family: var(--kv-font-display);
    font-size: 2rem;
    font-weight: 700;
}

.kv-badge-text {
    font-size: 0.75rem;
    letter-spacing: 1px;
    opacity: 0.9;
}

.kv-about-content h3 {
    font-size: 1.35rem;
    color: var(--kv-blue-primary);
    margin-bottom: 20px;
    line-height: 1.4;
}

.kv-about-content p {
    color: var(--kv-gray-500);
    margin-bottom: 16px;
    font-size: 0.95rem;
}

.kv-about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin: 28px 0;
}

.kv-about-feature {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--kv-dark-700);
}

.kv-about-feature i {
    color: var(--kv-green-primary);
    font-size: 1rem;
}

/* ============================================
   SERVICES
   ============================================ */
.kv-services {
    background: var(--kv-gray-100);
}

.kv-services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.kv-service-card {
    background: var(--kv-white);
    border-radius: var(--kv-radius-md);
    padding: 36px 28px;
    transition: var(--kv-transition);
    border: 1px solid var(--kv-gray-200);
    position: relative;
    overflow: hidden;
}

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

.kv-service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--kv-shadow-lg);
    border-color: transparent;
}

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

.kv-service-card.featured {
    border-color: var(--kv-blue-primary);
    background: linear-gradient(180deg, var(--kv-blue-light), var(--kv-white));
}

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

.kv-service-badge {
    position: absolute;
    top: 16px;
    right: 16px;
    background: var(--kv-red-primary);
    color: var(--kv-white);
    font-size: 0.65rem;
    font-weight: 700;
    padding: 4px 12px;
    border-radius: 50px;
    letter-spacing: 1px;
}

.kv-service-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--kv-radius-md);
    background: var(--kv-blue-light);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
    color: var(--kv-blue-primary);
    margin-bottom: 22px;
    transition: var(--kv-transition);
}

.kv-service-card:hover .kv-service-icon {
    background: var(--kv-blue-primary);
    color: var(--kv-white);
    transform: scale(1.05);
}

.kv-service-card h3 {
    font-size: 1.15rem;
    margin-bottom: 12px;
    color: var(--kv-dark-900);
}

.kv-service-card p {
    color: var(--kv-gray-500);
    font-size: 0.9rem;
    margin-bottom: 18px;
}

.kv-service-list {
    padding: 0;
    margin: 0;
}

.kv-service-list li {
    padding: 6px 0;
    font-size: 0.85rem;
    color: var(--kv-dark-700);
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.kv-service-list li::before {
    content: '✓';
    color: var(--kv-green-primary);
    font-weight: 700;
    font-size: 0.8rem;
}

/* ============================================
   PROJECTS
   ============================================ */
.kv-projects {
    background: var(--kv-white);
}

.kv-project-filters {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.kv-filter-btn {
    padding: 10px 24px;
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--kv-gray-100);
    color: var(--kv-gray-500);
    border: 1px solid var(--kv-gray-200);
    border-radius: 50px;
    cursor: pointer;
    transition: var(--kv-transition);
    font-family: var(--kv-font-primary);
}

.kv-filter-btn:hover,
.kv-filter-btn.active {
    background: var(--kv-blue-primary);
    color: var(--kv-white);
    border-color: var(--kv-blue-primary);
}

.kv-project-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.kv-tab-btn {
    padding: 10px 24px;
    font-size: 0.85rem;
    font-weight: 600;
    background: var(--kv-gray-100);
    color: var(--kv-gray-500);
    border: 1px solid var(--kv-gray-200);
    border-radius: 50px;
    cursor: pointer;
    transition: var(--kv-transition);
    font-family: var(--kv-font-primary);
}

.kv-tab-btn:hover,
.kv-tab-btn.active {
    background: var(--kv-blue-primary);
    color: var(--kv-white);
    border-color: var(--kv-blue-primary);
}

.kv-project-card {
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.kv-project-card.kv-hidden {
    display: none;
}

.kv-projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.kv-project-card {
    border-radius: var(--kv-radius-md);
    overflow: hidden;
    cursor: pointer;
    transition: var(--kv-transition);
}

.kv-project-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--kv-shadow-xl);
}

.kv-project-image {
    position: relative;
    height: 280px;
    overflow: hidden;
}

.kv-project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

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

.kv-project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 30, 70, 0.9) 0%, transparent 60%);
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 24px;
    color: var(--kv-white);
    opacity: 0;
    transform: translateY(10px);
    transition: var(--kv-transition);
}

.kv-project-card:hover .kv-project-overlay {
    opacity: 1;
    transform: translateY(0);
}

.kv-project-category {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--kv-gold);
    margin-bottom: 6px;
}

.kv-project-overlay h4 {
    font-size: 1.15rem;
    margin-bottom: 4px;
}

.kv-project-overlay p {
    font-size: 0.82rem;
    opacity: 0.8;
}

/* ============================================
   WHY CHOOSE US
   ============================================ */
.kv-why-us {
    background: linear-gradient(135deg, var(--kv-dark-900), var(--kv-dark-800));
    color: var(--kv-white);
}

.kv-why-us .kv-section-tag {
    background: rgba(255, 255, 255, 0.1);
    color: var(--kv-gold);
}

.kv-why-us .kv-section-title {
    color: var(--kv-white);
}

.kv-why-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.kv-why-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--kv-radius-md);
    padding: 36px 28px;
    text-align: center;
    transition: var(--kv-transition);
}

.kv-why-card:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.15);
}

.kv-why-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--kv-blue-primary), #1976D2);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--kv-white);
}

.kv-why-card h4 {
    font-size: 1.05rem;
    margin-bottom: 10px;
}

.kv-why-card p {
    font-size: 0.88rem;
    opacity: 0.7;
    line-height: 1.7;
}

/* ============================================
   PROCESS
   ============================================ */
.kv-process {
    background: var(--kv-gray-100);
}

.kv-process-timeline {
    display: flex;
    gap: 16px;
    position: relative;
    flex-wrap: wrap;
    justify-content: center;
}

.kv-process-step {
    flex: 1;
    min-width: 190px;
    max-width: 220px;
    text-align: center;
    position: relative;
}

.kv-step-number {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--kv-blue-primary), var(--kv-blue-dark));
    color: var(--kv-white);
    font-family: var(--kv-font-display);
    font-size: 1.3rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(0, 82, 165, 0.3);
    position: relative;
    z-index: 2;
}

.kv-step-content h4 {
    font-size: 0.95rem;
    margin-bottom: 8px;
    color: var(--kv-dark-900);
}

.kv-step-content p {
    font-size: 0.82rem;
    color: var(--kv-gray-500);
}

/* ============================================
   TESTIMONIALS
   ============================================ */
.kv-testimonials {
    background: var(--kv-white);
}

.kv-testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.kv-testimonial-card {
    background: var(--kv-gray-100);
    border-radius: var(--kv-radius-md);
    padding: 32px;
    border: 1px solid var(--kv-gray-200);
    transition: var(--kv-transition);
}

.kv-testimonial-card:hover {
    box-shadow: var(--kv-shadow-md);
    border-color: var(--kv-blue-light);
}

.kv-testimonial-stars {
    color: #F59E0B;
    font-size: 0.9rem;
    margin-bottom: 16px;
    display: flex;
    gap: 3px;
}

.kv-testimonial-card>p {
    font-size: 0.92rem;
    color: var(--kv-gray-500);
    font-style: italic;
    margin-bottom: 20px;
    line-height: 1.8;
}

.kv-testimonial-author {
    display: flex;
    align-items: center;
    gap: 12px;
}

.kv-author-avatar {
    font-size: 2.2rem;
    color: var(--kv-blue-primary);
    opacity: 0.6;
}

.kv-testimonial-author strong {
    display: block;
    font-size: 0.9rem;
    color: var(--kv-dark-800);
}

.kv-testimonial-author span {
    font-size: 0.78rem;
    color: var(--kv-gray-400);
}

/* ============================================
   CONTACT
   ============================================ */
.kv-contact {
    background: var(--kv-gray-100);
}

.kv-contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 50px;
    align-items: start;
}

.kv-contact-item {
    display: flex;
    gap: 16px;
    margin-bottom: 28px;
}

.kv-contact-icon {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--kv-blue-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--kv-blue-primary);
    font-size: 1.1rem;
    flex-shrink: 0;
}

.kv-contact-item h4 {
    font-size: 0.95rem;
    margin-bottom: 4px;
    color: var(--kv-dark-800);
}

.kv-contact-item p,
.kv-contact-item a {
    font-size: 0.9rem;
    color: var(--kv-gray-500);
}

.kv-contact-item a:hover {
    color: var(--kv-blue-primary);
}

.kv-contact-social {
    display: flex;
    gap: 12px;
    margin-top: 10px;
}

.kv-social-link {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--kv-blue-light);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--kv-blue-primary);
    font-size: 1rem;
    transition: var(--kv-transition);
    text-decoration: none;
}

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

.kv-contact-form {
    background: var(--kv-white);
    padding: 36px;
    border-radius: var(--kv-radius-md);
    box-shadow: var(--kv-shadow-md);
}

.kv-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.kv-form-group {
    margin-bottom: 20px;
}

.kv-form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--kv-dark-700);
    margin-bottom: 6px;
}

.kv-required {
    color: var(--kv-red-primary);
}

.kv-form-group input,
.kv-form-group select,
.kv-form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.9rem;
    font-family: var(--kv-font-primary);
    border: 1.5px solid var(--kv-gray-300);
    border-radius: var(--kv-radius-sm);
    background: var(--kv-gray-100);
    transition: var(--kv-transition);
    color: var(--kv-dark-800);
}

.kv-form-group input:focus,
.kv-form-group select:focus,
.kv-form-group textarea:focus {
    outline: none;
    border-color: var(--kv-blue-primary);
    background: var(--kv-white);
    box-shadow: 0 0 0 3px rgba(0, 82, 165, 0.1);
}

.kv-form-group textarea {
    resize: vertical;
    min-height: 100px;
}

/* ============================================
   FOOTER
   ============================================ */
.kv-footer {
    background: var(--kv-dark-900);
    color: rgba(255, 255, 255, 0.75);
    padding: 70px 0 0;
}

.kv-footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

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

.kv-footer-logo-img {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.kv-footer-logo span {
    font-family: var(--kv-font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--kv-white);
}

.kv-footer-brand p {
    font-size: 0.88rem;
    line-height: 1.7;
    margin-bottom: 8px;
}

.kv-footer-slogan {
    font-style: italic;
    color: var(--kv-gold) !important;
    font-size: 0.85rem !important;
}

.kv-footer-links h4,
.kv-footer-contact h4 {
    color: var(--kv-white);
    font-size: 1rem;
    margin-bottom: 20px;
}

.kv-footer-links a {
    display: block;
    font-size: 0.88rem;
    padding: 5px 0;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--kv-transition);
    text-decoration: none;
}

.kv-footer-links a:hover {
    color: var(--kv-white);
    padding-left: 6px;
}

.kv-footer-contact p {
    font-size: 0.88rem;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.kv-footer-contact i {
    color: var(--kv-blue-primary);
    width: 16px;
}

.kv-footer-bottom {
    text-align: center;
    padding: 24px 0;
    font-size: 0.82rem;
    color: rgba(255, 255, 255, 0.4);
}

/* ============================================
   BACK TO TOP & FLOATING
   ============================================ */
.kv-back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--kv-blue-primary);
    color: var(--kv-white);
    border: none;
    font-size: 1.1rem;
    cursor: pointer;
    box-shadow: var(--kv-shadow-lg);
    transition: var(--kv-transition);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    z-index: 999;
}

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

.kv-back-to-top:hover {
    background: var(--kv-blue-dark);
    transform: translateY(-3px);
}

.kv-zalo-float {
    position: fixed;
    bottom: 90px;
    right: 28px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: #0068FF;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 104, 255, 0.4);
    z-index: 999;
    animation: kvPulseZalo 2s infinite;
    text-decoration: none;
}

.kv-zalo-float img {
    border-radius: 50%;
}

@keyframes kvPulseZalo {
    0% {
        box-shadow: 0 0 0 0 rgba(0, 104, 255, 0.5);
    }

    70% {
        box-shadow: 0 0 0 15px rgba(0, 104, 255, 0);
    }

    100% {
        box-shadow: 0 0 0 0 rgba(0, 104, 255, 0);
    }
}

/* ============================================
   SCROLL ANIMATIONS
   ============================================ */
.kv-fade-in {
    color: #fff;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.kv-fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    .kv-section-title {
        font-size: 2.2rem;
    }

    .kv-hero-title-main {
        font-size: 3.5rem;
    }

    .kv-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .kv-about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .kv-projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .kv-why-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .kv-testimonials-grid {
        grid-template-columns: 1fr;
    }

    .kv-footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .kv-section {
        padding: 70px 0;
    }

    .kv-section-title {
        font-size: 1.8rem;
    }

    .kv-header {
        display: none;
    }

    .menu-res {
        display: block !important;
    }

    .kv-hero {
        min-height: 70vh;
        margin-top: 0;
    }

    .kv-hero-title-main {
        font-size: 2.5rem;
        letter-spacing: 2px;
    }

    .kv-hero-title-sub {
        font-size: 1rem;
    }

    .kv-hero-badge {
        font-size: 0.6rem;
        letter-spacing: 1.5px;
        padding: 6px 16px;
    }

    .kv-stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .kv-stat-item {
        padding: 24px 16px;
    }

    .kv-stat-number {
        font-size: 2rem;
    }

    .kv-stat-item:not(:last-child)::after {
        display: none;
    }

    .kv-about-grid {
        grid-template-columns: 1fr;
    }

    .kv-about-image img {
        height: 300px;
    }

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

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

    .kv-projects-grid {
        grid-template-columns: 1fr;
    }

    .kv-why-grid {
        grid-template-columns: 1fr;
    }

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

    .kv-form-row {
        grid-template-columns: 1fr;
    }

    .kv-footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .kv-process-timeline {
        flex-direction: column;
        align-items: center;
    }

    .kv-process-step {
        max-width: 100%;
    }

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

    .kv-btn {
        width: 100%;
        justify-content: center;
    }

    .kv-zalo-float {
        bottom: 80px;
        right: 16px;
        width: 48px;
        height: 48px;
    }

    .kv-back-to-top {
        bottom: 20px;
        right: 16px;
        width: 42px;
        height: 42px;
    }
}

@media (max-width: 480px) {
    .kv-hero-title-main {
        font-size: 2rem;
    }

    .kv-section-title {
        font-size: 1.5rem;
    }

    .kv-logo-name {
        font-size: 1.1rem;
    }

    .kv-logo-slogan {
        font-size: 0.55rem;
    }

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