/* ======================================================= */
/* 1. THIẾT LẬP CHUNG VÀ BIẾN (GLOBAL STYLES & VARIABLES) */
/* ======================================================= */

:root {
    --color-dark-bg: #111417;          /* Nền tối chính */
    --color-dark-card: #1e2126;        /* Nền card/input */
    --color-dark-text: #e0e6ec;        /* Màu chữ sáng */
    --color-primary: #3b82f6;          /* Màu chủ đạo (Xanh dương) */
    --color-secondary-text: #a0aec0;   /* Màu chữ phụ */
    --padding-section: 80px;
}

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

body {
    font-family: Arial, sans-serif;
    background-color: var(--color-dark-bg);
    color: var(--color-dark-text);
    line-height: 1.6;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}

/* --- Đường kẻ phân cách --- */
hr {
    border: 0;
    height: 1px;
    background-color: #2d3748; 
}

.section-divider {
    margin: 40px 0;
}

/* --- Định kiểu nút bấm và liên kết chung --- */
.btn-primary {
    background-color: var(--color-primary);
    color: white;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s;
    border: none;
    cursor: pointer;
}

.btn-primary:hover {
    background-color: #2563eb;
}

.btn-secondary {
    background: none;
    border: 1px solid var(--color-primary);
    color: var(--color-primary);
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s, color 0.3s;
}

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

.large-btn {
    padding: 15px 30px;
    font-size: 1.1em;
}

.small-btn {
    padding: 8px 15px;
    font-size: 0.9em;
}

/* ======================================================= */
/* 2. HEADER & NAVIGATION */
/* ======================================================= */

.header {
    background-color: var(--color-dark-bg);
    padding: 15px 0;
    border-bottom: 1px solid #2d3748;
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo {
    font-size: 1.8em;
    font-weight: bold;
    color: var(--color-dark-text);
}

.navbar a {
    color: var(--color-dark-text);
    text-decoration: none;
    margin-left: 25px;
    font-size: 0.95em;
    padding-bottom: 5px;
    transition: color 0.3s;
}

.navbar a:hover,
.navbar a.active {
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-primary);
}


/* ======================================================= */
/* 3. CÁC KHỐI NỘI DUNG CHUNG (SECTION STYLES) */
/* ======================================================= */

.section {
    padding: var(--padding-section) 0;
    text-align: center;
}

.section-title {
    font-size: 2.5em;
    margin-bottom: 10px;
}

.section-subtitle {
    color: var(--color-secondary-text);
    margin-bottom: 50px;
    font-size: 1.1em;
}

/* --- Breadcrumb --- */
.breadcrumb {
    text-align: left;
    font-size: 0.9em;
    color: var(--color-secondary-text);
    margin-bottom: 20px;
}

.breadcrumb a {
    color: var(--color-primary);
    text-decoration: none;
}


/* --- Card Grid Layout --- */
.card-grid {
    display: grid;
    gap: 30px;
    grid-template-columns: repeat(3, 1fr); /* Mặc định 3 cột */
}

.card-grid.two-columns {
    grid-template-columns: repeat(2, 1fr); /* 2 cột cho testimonial/portfolio/about */
}

/* --- Icons cho card --- */
.icon-card {
    font-size: 2.2em;
    color: var(--color-primary);
    margin-bottom: 15px;
    display: block;
}

/* ======================================================= */
/* 4. ĐỊNH KIỂU CHO INDEX.HTML (TRANG CHỦ) */
/* ======================================================= */

/* --- Hero Section --- */
.hero-section {
    padding: 100px 0;
}

.hero-content {
    display: flex;
    align-items: center;
    text-align: left;
    gap: 40px;
}

.hero-text {
    flex: 2;
}

.hero-text h1 {
    font-size: 3.5em;
    line-height: 1.2;
    margin-bottom: 20px;
}

.hero-text h1 strong {
    color: var(--color-primary);
}

.hero-text p {
    font-size: 1.1em;
    color: var(--color-secondary-text);
    margin-bottom: 30px;
}

.hero-image {
    flex: 1;
}

.hero-image img {
    width: 100%;
    border-radius: 8px;
    /* Tạm thời set màu nền cho ảnh placeholder */
    background-color: #2a3340; 
}

.hero-actions {
    display: flex;
    gap: 20px;
}

/* --- Service Detail Card (Dùng chung cho Index/Service) --- */
.service-detail-card {
    background-color: var(--color-dark-card);
    padding: 25px;
    border-radius: 8px;
    transition: box-shadow 0.3s, transform 0.3s;
    height: 100%;
    text-align: left;
}

.service-detail-card:hover {
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.2); 
    transform: translateY(-3px);
}

.service-detail-card h3 {
    font-size: 1.2em;
    margin-bottom: 10px;
}

.service-detail-card p {
    color: var(--color-secondary-text);
    font-size: 0.95em;
    margin-bottom: 15px;
}

/* --- Feature Card (Why Us) --- */
.feature-card {
    background-color: var(--color-dark-card);
    padding: 25px;
    border-radius: 8px;
    text-align: center;
    height: 100%;
}

.icon-feature {
    font-size: 2em;
    color: var(--color-primary);
    margin-bottom: 15px;
}

.feature-card p {
    color: var(--color-secondary-text);
    font-size: 0.95em;
}

/* --- Team Member --- */
.team-member {
    background-color: var(--color-dark-card);
    padding: 20px;
    border-radius: 8px;
    text-align: center;
}

.member-photo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 15px;
    border: 3px solid var(--color-primary);
    background-color: #2a3340; /* Tạm thời */
}

.member-role {
    color: var(--color-primary);
    font-weight: bold;
    margin-bottom: 8px;
}

.member-bio {
    color: var(--color-secondary-text);
    font-size: 0.9em;
}

/* --- Testimonials --- */
.testimonial-card {
    background-color: var(--color-dark-card);
    padding: 30px;
    border-radius: 8px;
    text-align: left;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.testimonial-card p {
    font-style: italic;
    font-size: 1.05em;
    margin-bottom: 20px;
}

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

.client-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    object-fit: cover;
    margin-right: 15px;
    background-color: #2a3340; /* Tạm thời */
}

.client-info h4 {
    margin: 0;
}

.client-info p {
    margin: 0;
    font-size: 0.9em;
    font-style: normal;
    color: var(--color-secondary-text);
}

/* --- CTA Bottom (Chung cho nhiều trang) --- */
.cta-section-bottom {
    background-color: var(--color-primary);
    color: white;
    padding: 60px 0;
}

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

.cta-content h2 {
    font-size: 2em;
    margin-bottom: 10px;
}

.cta-content p {
    font-size: 1.1em;
    margin-bottom: 30px;
}

.cta-content .btn-primary {
    background-color: white;
    color: var(--color-primary);
    border: none;
    transition: background-color 0.3s;
}

.cta-content .btn-primary:hover {
    background-color: #f0f0f0;
}


/* ======================================================= */
/* 5. ĐỊNH KIỂU CHO SERVICES.HTML (TRANG DỊCH VỤ) */
/* ======================================================= */

.services-page-main {
    padding-top: 40px; 
}

.page-hero-title {
    text-align: center;
    padding-bottom: 40px;
}

.page-hero-title h1 {
    font-size: 3em;
    margin-bottom: 10px;
}

.page-hero-title h1 strong {
    color: var(--color-primary);
}

.page-hero-title .subtitle-text {
    color: var(--color-secondary-text);
    margin-bottom: 30px;
    font-size: 1.1em;
}

.service-category {
    text-align: left;
}

.category-title {
    font-size: 2em;
    margin-bottom: 10px;
    color: var(--color-dark-text);
}

.category-title i {
    color: var(--color-primary);
    margin-right: 10px;
}

.category-desc {
    color: var(--color-secondary-text);
    margin-bottom: 30px;
    font-size: 1em;
}

.tech-stack {
    display: inline-block;
    font-size: 0.8em;
    color: #48bb78; 
    background-color: #2a4365;
    padding: 4px 8px;
    border-radius: 4px;
    margin-top: 10px;
}


/* ======================================================= */
/* 6. ĐỊNH KIỂU CHO CONTACT.HTML (TRANG LIÊN HỆ) */
/* ======================================================= */

.contact-main {
    padding: 60px 0;
}

.main-title {
    font-size: 3em;
    text-align: center;
    margin-bottom: 10px;
}

.subtitle {
    text-align: center;
    color: var(--color-secondary-text);
    margin-bottom: 50px;
    font-size: 1.1em;
}

.contact-content {
    display: flex;
    gap: 40px;
    text-align: left;
}

.form-section {
    flex: 2;
    background-color: var(--color-dark-card);
    padding: 30px;
    border-radius: 8px;
}

.form-section h2 {
    font-size: 1.5em;
    margin-bottom: 25px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-row {
    display: flex;
    gap: 20px;
    width: 100%;
}

.input-group {
    flex: 1;
    display: flex;
    flex-direction: column;
}

.input-group label {
    margin-bottom: 8px;
    font-weight: bold;
    font-size: 0.9em;
}

.input-group input,
.input-group select,
.input-group textarea {
    background-color: var(--color-dark-bg);
    color: var(--color-dark-text);
    border: 1px solid #4a5568;
    padding: 12px 15px;
    border-radius: 6px;
    font-size: 1em;
    outline: none;
    transition: border-color 0.3s;
}

.input-group input:focus,
.input-group select:focus,
.input-group textarea:focus {
    border-color: var(--color-primary);
}

.btn-submit {
    background-color: var(--color-primary);
    color: white;
    padding: 15px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 1.1em;
    margin-top: 15px;
    transition: background-color 0.3s;
}

.btn-submit:hover {
    background-color: #2563eb;
}

/* Info Section */
.info-section {
    flex: 1;
    padding: 0;
}

.info-section h2 {
    font-size: 1.2em;
    margin-bottom: 20px;
    border-bottom: 1px solid #2d3748;
    padding-bottom: 10px;
}

.contact-detail {
    display: flex;
    align-items: flex-start;
    margin-bottom: 20px;
}

.contact-detail i {
    font-size: 1.2em;
    color: var(--color-primary);
    margin-right: 15px;
    margin-top: 3px;
}

.detail-text h4 {
    margin: 0;
    color: var(--color-dark-text);
    font-size: 1em;
}

.detail-text p {
    color: var(--color-secondary-text);
    font-size: 0.95em;
    margin-top: 5px;
}

.map-title {
    margin-top: 30px;
}

.map-container {
    background-color: #f7f9fb; 
    border-radius: 8px;
    overflow: hidden; 
}

.map-container iframe {
    display: block; 
}


/* ======================================================= */
/* 7. ĐỊNH KIỂU CHO PORTFOLIO.HTML */
/* ======================================================= */

.project-card {
    background-color: var(--color-dark-card);
    border-radius: 8px;
    overflow: hidden;
    transition: box-shadow 0.3s, transform 0.3s;
    height: 100%;
    text-align: left;
}

.project-card:hover {
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.2); 
    transform: translateY(-5px);
}

.project-image {
    width: 100%;
    height: 220px;
    object-fit: cover;
    display: block;
    background-color: #2a3340; /* Tạm thời */
}

.project-info {
    padding: 20px;
}

.project-info h3 {
    font-size: 1.3em;
    margin-bottom: 10px;
}

.project-info p {
    color: var(--color-secondary-text);
    margin-bottom: 15px;
}

/* ======================================================= */
/* 8. ĐỊNH KIỂU CHO ABOUT.HTML */
/* ======================================================= */

.vision-mission-section .detail-block {
    text-align: left;
    background-color: var(--color-dark-card);
    padding: 30px;
    border-radius: 8px;
    height: 100%;
}

.vision-mission-section .detail-block h2 {
    font-size: 1.8em;
    color: var(--color-primary);
    margin-bottom: 10px;
}

.vision-mission-section .detail-block .icon-feature {
    font-size: 2.5em;
    margin-bottom: 20px;
}


/* ======================================================= */
/* 9. FOOTER */
/* ======================================================= */

.footer {
    background-color: var(--color-dark-bg);
    border-top: 1px solid #2d3748;
    padding: 20px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9em;
}

.social-links a {
    color: var(--color-secondary-text);
    font-size: 1.2em;
    margin-left: 15px;
    transition: color 0.3s;
}

.social-links a:hover {
    color: var(--color-primary);
}


/* ======================================================= */
/* 10. RESPONSIVE (MEDIA QUERIES) */
/* ======================================================= */

@media (max-width: 992px) {
    /* Đa số các khối từ 3 cột về 2 cột */
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    /* Các khối đặc biệt chuyển về 1 cột trên iPad/Tablet */
    .card-grid.three-columns,
    .card-grid.two-columns {
        grid-template-columns: 1fr;
    }
    
    /* Trang chủ */
    .hero-content {
        flex-direction: column;
        text-align: center;
    }

    .hero-image {
        order: -1; 
        margin-bottom: 30px;
    }

    .hero-text h1 {
        font-size: 2.5em;
    }

    .hero-actions {
        justify-content: center;
    }

    /* Trang liên hệ */
    .contact-content {
        flex-direction: column;
    }
    
    .form-section, .info-section {
        flex: none;
        width: 100%;
    }
    
    .form-section {
        margin-bottom: 30px;
    }
}

@media (max-width: 600px) {
    /* Tất cả các khối Card chuyển về 1 cột trên mobile */
    .card-grid {
        grid-template-columns: 1fr;
    }

    /* Navbar bị ẩn (cần JavaScript để hiện menu hamburger) */
    .navbar {
        display: none;
    }
    
    /* Footer */
    .footer-content {
        flex-direction: column;
        gap: 10px;
    }

    /* Trang liên hệ - Form */
    .form-row {
        flex-direction: column;
        gap: 0;
    }
    
    .section-title {
        font-size: 2em;
    }

    .main-title {
        font-size: 2.5em;
    }
}