/* ========================
   Cấu hình cơ bản & biến CSS
   ======================== */
:root {
    --primary-color: #0f172a;
    /* Deep Navy */
    --accent-color: #c5a059;
    /* Burnished Gold */
    --accent-dark: #b45309;
    /* Copper */

    --bg-light: #f8fafc;
    --bg-surface: #ffffff;
    --bg-dark: #020617;

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-light: #ffffff;
    --text-accent: #c5a059;

    --font-heading: 'Outfit', 'Montserrat', sans-serif;
    --font-body: 'Inter', 'Roboto', sans-serif;

    --padding-section: 100px 0;
    --container-width: 1200px;
    --border-radius-main: 12px;
    --border-radius-sm: 8px;

    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-premium: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);

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

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-body);
    color: var(--text-secondary);
    line-height: 1.6;
    background-color: var(--bg-surface);
    -webkit-font-smoothing: antialiased;
}

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

/* ========================
   Tiêu đề & Nút bấm
   ======================== */
/* ========================
   Tiêu đề & Nút bấm
   ======================== */
.section-padding {
    padding: var(--padding-section);
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header .title {
    font-family: var(--font-heading);
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    letter-spacing: -0.01em;
}

.section-header .subtitle {
    font-size: 1.1rem;
    color: var(--accent-color);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
    display: block;
    margin-bottom: 10px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    border-radius: var(--border-radius-main);
    font-weight: 600;
    font-family: var(--font-heading);
    text-decoration: none;
    transition: var(--transition-base);
    cursor: pointer;
    border: none;
}

.btn i {
    margin-left: 10px;
    font-size: 0.9rem;
    transition: transform 0.3s ease;
}

.btn:hover i {
    transform: translateX(5px);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--text-light);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background-color: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: var(--text-light);
    transform: translateY(-2px);
}

/* ========================
   Header & Navigation
   ======================== */
/* ========================
   Header & Navigation (Premium Glassmorphism)
   ======================== */
header {
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 18px 0;
    position: fixed;
    /* Fixed for better feel */
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

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

header .logo img {
    height: 48px;
    width: auto;
}

header nav ul {
    display: flex;
    gap: 32px;
    align-items: center;
    list-style: none;
}

header nav a {
    color: var(--text-primary);
    font-family: var(--font-heading);
    font-weight: 500;
    font-size: 0.95rem;
    text-decoration: none;
    transition: var(--transition-base);
    position: relative;
}

header nav a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: var(--transition-base);
}

header nav a:hover {
    color: var(--accent-color);
}

header nav a:hover::after {
    width: 100%;
}

header nav a.btn {
    padding: 10px 24px;
    background-color: var(--primary-color);
    color: var(--text-light);
    border-radius: var(--border-radius-sm);
}

header nav a.btn:hover {
    background-color: var(--accent-color);
    color: var(--primary-color);
    transform: translateY(-1px);
}

header nav a.btn::after {
    display: none;
}

/* ========================
   Hero Section
   ======================== */
/* ========================
   Hero Section (Premium Layout)
   ======================== */
.hero-section {
    background-color: var(--bg-light);
    padding: 180px 0 120px;
    /* Space for fixed header */
    overflow: hidden;
}

.hero-section .container {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    align-items: center;
    gap: 60px;
}

.hero-content h1 {
    font-family: var(--font-heading);
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    max-width: 540px;
    line-height: 1.6;
}

.hero-buttons {
    display: flex;
    gap: 16px;
}

.hero-image-container {
    position: relative;
    padding: 20px;
}

.hero-main-img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-premium);
    transform: perspective(1000px) rotateY(-5deg);
    transition: var(--transition-base);
}

.hero-main-img:hover {
    transform: perspective(1000px) rotateY(0deg);
}

.hero-badge {
    position: absolute;
    bottom: 40px;
    left: -20px;
    background-color: var(--bg-surface);
    padding: 20px 30px;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: 15px;
    animation: float 4s ease-in-out infinite;
}

@keyframes float {

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

    50% {
        transform: translateY(-10px);
    }
}

.hero-badge i {
    font-size: 2rem;
    color: var(--accent-color);
}

.hero-badge span {
    font-weight: 600;
    font-family: var(--font-heading);
    color: var(--text-primary);
}

/* ========================
   About Us Section
   ======================== */
/* ========================
   About Us Section (Modern Grid)
   ======================== */
.about-section {
    background-color: var(--bg-surface);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 80px;
}

.about-image {
    position: relative;
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-lg);
    z-index: 2;
    position: relative;
}

.about-image::before {
    content: '';
    position: absolute;
    top: -30px;
    left: -30px;
    width: 70%;
    height: 70%;
    background-color: var(--accent-color);
    border-radius: var(--border-radius-main);
    z-index: 1;
    opacity: 0.1;
}

.about-text h3 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: 24px;
}

.about-text p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.about-text strong {
    color: var(--text-primary);
}

/* ========================
   Services Section
   ======================== */
/* ========================
   Services Section (Premium Cards)
   ======================== */
.services-section {
    background-color: var(--bg-light);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.service-item {
    background-color: var(--bg-surface);
    padding: 60px 40px;
    border-radius: var(--border-radius-main);
    box-shadow: var(--shadow-md);
    text-align: left;
    transition: var(--transition-base);
    border-bottom: 4px solid transparent;
}

.service-item:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-premium);
    border-bottom-color: var(--accent-color);
}

.service-item .icon-box {
    width: 60px;
    height: 60px;
    background-color: var(--bg-light);
    color: var(--accent-color);
    border-radius: var(--border-radius-sm);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    margin-bottom: 30px;
    transition: var(--transition-base);
}

.service-item:hover .icon-box {
    background-color: var(--accent-color);
    color: var(--text-light);
}

.service-item h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.service-item p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 25px;
}

.service-item .service-link {
    display: inline-flex;
    align-items: center;
    font-weight: 600;
    color: var(--primary-color);
    text-decoration: none;
    font-family: var(--font-heading);
    gap: 8px;
    transition: var(--transition-base);
}

.service-item .service-link:hover {
    color: var(--accent-color);
    gap: 12px;
}

/* ========================
   Benefits Section
   ======================== */
/* ========================
   Benefits Section (Premium Grid)
   ======================== */
.benefits-section {
    background-color: var(--bg-surface);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.benefit-item {
    text-align: left;
    padding: 40px;
    border-radius: var(--border-radius-main);
    background-color: var(--bg-light);
    transition: var(--transition-base);
    border-left: 4px solid transparent;
}

.benefit-item:hover {
    background-color: var(--bg-surface);
    box-shadow: var(--shadow-lg);
    border-left-color: var(--accent-color);
}

.benefit-item i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 24px;
    display: block;
}

.benefit-item h4 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.benefit-item p {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ========================
   Process Section
   ======================== */
/* ========================
   Process Section (Premium Timeline)
   ======================== */
.process-section {
    background-color: var(--bg-light);
}

.process-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 40px;
}

.process-item {
    text-align: center;
    position: relative;
    z-index: 2;
}

.process-number {
    width: 64px;
    height: 64px;
    background-color: var(--primary-color);
    color: var(--text-light);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 24px;
    box-shadow: var(--shadow-md);
    position: relative;
}

.process-item h4 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.process-item p {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* ========================
   Testimonials Section
   ======================== */
/* ========================
   Testimonials Section (Elegant Cards)
   ======================== */
.testimonials-section {
    background-color: var(--bg-surface);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 40px;
}

.testimonial-item {
    background-color: var(--bg-light);
    padding: 50px;
    border-radius: var(--border-radius-main);
    display: flex;
    flex-direction: column;
    position: relative;
    transition: var(--transition-base);
}

.testimonial-item:hover {
    background-color: var(--bg-surface);
    box-shadow: var(--shadow-premium);
}

.testimonial-item::before {
    content: '"';
    position: absolute;
    top: 20px;
    right: 40px;
    font-size: 8rem;
    color: var(--accent-color);
    opacity: 0.1;
    font-family: serif;
    line-height: 1;
}

.testimonial-item p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 30px;
    position: relative;
    z-index: 1;
}

.client-info {
    display: flex;
    align-items: center;
    gap: 20px;
}

.client-info img {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--accent-color);
}

.client-details h4 {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.client-details span {
    font-size: 0.9rem;
    color: var(--accent-color);
    font-weight: 500;
}

/* ========================
   FAQ Section (Modern Accordion)
   ======================== */
.faq-section {
    background-color: var(--bg-light);
}

.faq-accordion {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--bg-surface);
    border-radius: var(--border-radius-sm);
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.faq-question {
    font-family: var(--font-heading);
    font-size: 1.15rem;
    font-weight: 600;
    color: var(--text-primary);
    padding: 24px 30px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition-base);
}

.faq-question:hover {
    color: var(--accent-color);
}

.faq-question::after {
    content: '\f067';
    font-family: 'Font Awesome 6 Free';
    font-weight: 900;
    font-size: 0.9rem;
    transition: var(--transition-base);
}

.faq-item.active .faq-question::after {
    content: '\f068';
    transform: rotate(180deg);
}

.faq-answer {
    padding: 0 30px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.5s ease;
    color: var(--text-secondary);
    line-height: 1.7;
}

.faq-item.active .faq-answer {
    padding-bottom: 24px;
    max-height: 300px;
}

/* ========================
   Contact Section (Refined)
   ======================== */
.contact-section {
    background-color: var(--bg-surface);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 80px;
}

.contact-info {
    background-color: var(--primary-color);
    padding: 60px;
    border-radius: var(--border-radius-main);
    color: var(--text-light);
}

.contact-info h3 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 30px;
    color: var(--text-light);
}

.contact-info p {
    margin-bottom: 24px;
    font-size: 1.1rem;
}

.contact-info i {
    color: var(--accent-color);
    width: 24px;
    font-size: 1.25rem;
}

.contact-info a {
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition-base);
}

.contact-info a:hover {
    color: var(--accent-color);
}

.contact-form h3 {
    font-family: var(--font-heading);
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 30px;
}

.contact-form .form-group {
    margin-bottom: 24px;
}

.contact-form label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    display: block;
}

.contact-form input,
.contact-form textarea {
    background-color: var(--bg-light);
    border: none;
    padding: 16px 20px;
    border-radius: var(--border-radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
}

.contact-form input:focus,
.contact-form textarea:focus {
    background-color: var(--bg-surface);
    box-shadow: 0 0 0 2px var(--accent-color);
}

.map-container {
    margin-top: 50px;
    border-radius: var(--border-radius-main);
    overflow: hidden;
    box-shadow: var(--box-shadow-light);
}

.map-container iframe {
    width: 100%;
    height: 400px;
    border: none;
}

/* ========================
   Footer (Premium Dark)
   ======================== */
footer {
    background-color: var(--bg-dark);
    color: rgba(255, 255, 255, 0.6);
    padding: 100px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 80px;
    margin-bottom: 80px;
}

.footer-about img {
    height: 40px;
    margin-bottom: 20px;
}

.footer-about p {
    margin-top: 24px;
    font-size: 1.1rem;
    line-height: 1.7;
}

.footer-links h4,
.footer-contact-info h4 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    color: var(--text-light);
    margin-bottom: 30px;
    font-weight: 700;
}

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

.footer-links li {
    margin-bottom: 12px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.6);
    text-decoration: none;
    transition: var(--transition-base);
}

.footer-links a:hover {
    color: var(--accent-color);
    padding-left: 8px;
}

.footer-contact-info p {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
}

.footer-contact-info i {
    color: var(--primary-color);
    margin-right: 15px;
}

.footer-contact-info a {
    color: rgba(255, 255, 255, 0.8);
    transition: color 0.3s ease;
}

.footer-contact-info a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 40px;
    text-align: center;
    font-size: 0.95rem;
}

/* ========================
   Responsive Design
   ======================== */
@media (max-width: 992px) {

    .hero-section .container,
    .about-content,
    .contact-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-image,
    .about-image {
        margin-bottom: 30px;
    }

    .hero-buttons {
        display: flex;
        justify-content: center;
    }

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

    .process-item::after {
        display: none;
    }
}

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

    .hero-content h1 {
        font-size: 2.2rem;
    }

    header nav {
        display: none;
        /* Ẩn menu trên mobile để thay bằng hamburger menu (cần JS) */
    }
}