/* ========================================
   Đất Mỏ Travel - Corporate Website
   Style: Premium Corporate
   Colors: Navy Blue (#0B1F3B), Gold (#C9A24A), White (#FFFFFF)
======================================== */

/* ========================================
   CSS Variables
======================================== */
:root {
    /* =========================
       Brand Colors (Logo-based)
    ========================= */
    --primary-color: #00CFEA;     /* Cyan – màu chính (logo D) */
    --secondary-color: #C84CFF;   /* Tím – điểm nhấn (logo M) */
    --accent-color: #0E4B63;      /* Xanh đậm – chữ, nền footer */

    /* =========================
       Text Colors
    ========================= */
    --text-dark: #0E4B63;         /* Heading */
    --text-medium: #374151;       /* Paragraph */
    --text-light: #6B7280;

    /* =========================
       Background
    ========================= */
    --bg-light: #F8FAFC;
    --bg-white: #FFFFFF;
    --border-color: #E5E7EB;

    /* =========================
       Typography
    ========================= */
    --font-primary: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --line-height-base: 1.6;

    /* =========================
       Spacing
    ========================= */
    --section-padding: 80px 0;
    --container-padding: 0 20px;
    --border-radius: 8px;

    /* =========================
       Transitions & Shadows
    ========================= */
    --transition-base: all 0.3s ease;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 6px 20px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 12px 36px rgba(0, 0, 0, 0.16);
}


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

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

body {
    font-family: var(--font-primary);
    line-height: var(--line-height-base);
    color: var(--text-dark);
    background-color: var(--bg-white);
    overflow-x: hidden;
}

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

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

ul {
    list-style: none;
}

/* ========================================
   Typography
======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.3;
    color: var(--primary-color);
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-medium);
}

/* ========================================
   Layout
======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--container-padding);
}

.section {
    padding: var(--section-padding);
}

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

.section-title {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-medium);
    max-width: 700px;
    margin: 0 auto;
}

.title-divider {
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--secondary-color), var(--primary-color));
    margin: 1.5rem auto;
}

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

.bg-light {
    background-color: var(--bg-light);
}

.bg-primary {
    background-color: var(--primary-color);
    color: var(--bg-white);
}

.bg-primary .section-title,
.bg-primary h1, .bg-primary h2, .bg-primary h3 {
    color: var(--bg-white);
}

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: var(--border-radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition-base);
    text-align: center;
}

.btn i {
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #0E4B63;
    border-color: #0E4B63;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--bg-white);
    border-color: var(--bg-white);
}

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

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

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

.btn-light {
    background-color: var(--bg-white);
    color: var(--primary-color);
    border-color: var(--bg-white);
}

.btn-light:hover {
    background-color: transparent;
    color: var(--bg-white);
    border-color: var(--bg-white);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.125rem;
}

/* ===== QUOTE BUTTON ===== */
.quote-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.quote-icon {
    display: none;
}


/* ========================================
   Header & Navigation
======================================== */
.header {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-base);
}

.navbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem 0;
}

.logo a {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: 2rem;
    color: var(--secondary-color);
}

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

.nav-menu a {
    font-weight: 500;
    color: var(--text-dark);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color);
    transition: var(--transition-base);
}

.nav-menu a:hover::after,
.nav-menu a.active::after {
    width: 100%;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.language-switch {
    display: flex;
    align-items: center;
    gap: 8px;
}

.lang-btn {
    background: none;
    border: none;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-light);
    cursor: pointer;
    transition: var(--transition-base);
}

.lang-btn.active {
    color: var(--primary-color);
}

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

.separator {
    color: var(--border-color);
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-toggle span {
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    transition: var(--transition-base);
}

/* ========================================
   Hero Section
======================================== */
.hero {
    position: relative;
    min-height: 650px;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: var(--bg-white);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><path fill="rgba(255,255,255,0.05)" d="M0,100 Q300,50 600,100 T1200,100 L1200,600 L0,600 Z"/></svg>');
    background-size: cover;
    opacity: 0.5;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(11, 31, 59, 0.4);
}

.hero-content {
    position: relative;
    z-index: 2;
    padding: 4rem 0;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--bg-white);
    margin-bottom: 1.5rem;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.95);
    margin-bottom: 2.5rem;
    max-width: 800px;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* Trust Badges */
.trust-badges {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    padding: 1.5rem 0;
    z-index: 3;
}

.badges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.badge-item {
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--primary-color);
}

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

.badge-item span {
    font-weight: 600;
    font-size: 0.95rem;
}

/* ========================================
   Introduction Section
======================================== */
.intro-content {
    max-width: 900px;
    margin: 0 auto;
}

.intro-text {
    font-size: 1.125rem;
    line-height: 1.8;
    text-align: center;
    margin-bottom: 2rem;
}

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

/* ========================================
   Services Section
======================================== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.service-card {
    background-color: var(--bg-white);
    border-radius: var(--border-radius);
    padding: 2.5rem 2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
    text-align: center;
}

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

.service-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--secondary-color), #d4ad5a);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
}

.service-icon i {
    font-size: 2rem;
    color: var(--bg-white);
}

.service-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.service-desc {
    font-size: 1rem;
    color: var(--text-medium);
    margin-bottom: 1.5rem;
}

.service-link {
    color: var(--secondary-color);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.service-link i {
    transition: var(--transition-base);
}

.service-link:hover i {
    transform: translateX(4px);
}

/* ========================================
   Capability Section
======================================== */
.capability-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.capability-desc {
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: 2rem;
}

.capability-features {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.feature-item {
    background-color: var(--bg-light);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    border-left: 4px solid var(--secondary-color);
}

.feature-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--secondary-color);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.feature-item h4 {
    font-size: 1rem;
    color: var(--text-dark);
}

/* ========================================
   CTA Section
======================================== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
}

.cta-content {
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2.5rem;
    color: var(--bg-white);
    margin-bottom: 1rem;
}

.cta-desc {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
}

/* ========================================
   Footer
======================================== */
.footer {
    background-color: var(--primary-color);
    color: var(--bg-white);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.footer-logo i {
    font-size: 2rem;
    color: var(--secondary-color);
}

.footer-desc {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.footer-social {
    display: flex;
    gap: 1rem;
}

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

.social-link:hover {
    background-color: var(--secondary-color);
    transform: translateY(-3px);
}

.footer-title {
    font-size: 1.125rem;
    color: var(--bg-white);
    margin-bottom: 1.5rem;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition-base);
}

.footer-links a:hover {
    color: var(--secondary-color);
    padding-left: 5px;
}

.footer-contact li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.8);
}

.footer-contact i {
    color: var(--secondary-color);
    margin-top: 3px;
}

.footer-contact a {
    color: rgba(255, 255, 255, 0.8);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
}

.footer-copyright,
.footer-legal {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

/* ========================================
   Back to Top Button
======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background-color: var(--secondary-color);
    color: var(--bg-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    z-index: 999;
}

.back-to-top:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.back-to-top.show {
    display: flex;
}

/* ========================================
   Responsive Design
======================================== */

/* Tablet */
@media (max-width: 968px) {
    :root {
        --section-padding: 60px 0;
    }
    
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background-color: var(--bg-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 2rem;
        gap: 1.5rem;
        box-shadow: var(--shadow-lg);
        transition: var(--transition-base);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .capability-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile */
@media (max-width: 640px) {
    :root {
        --section-padding: 40px 0;
        --container-padding: 0 15px;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.75rem; }
    h3 { font-size: 1.5rem; }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .hero {
        min-height: 550px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .badges-grid {
        grid-template-columns: 1fr;
        gap: 1rem;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
    }
    
    .capability-features {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .cta-title {
        font-size: 1.75rem;
    }
}

/* =========================
   Logo Header
========================= */

.logo img {
  height: 48px;          /* chiều cao logo desktop */
  width: auto;
  display: block;
}

@media (max-width: 768px) {
  .logo img {
    height: 40px;        /* logo mobile */
  }
}

.logo img {
  transition: var(--transition-base);
}

.logo img:hover {
  opacity: 0.85;
}

/* =========================
   Footer Logo
========================= */

.footer {
  background: var(--accent-color);
  color: #ffffff;
}

.footer-logo img {
  height: 42px;     /* nhỏ hơn header */
  width: auto;
  margin-bottom: 16px;
}

.footer-logo p {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
}
.footer-logo img {
  filter: brightness(0) invert(1);
}

@media (max-width: 480px) {
    .quote-btn {
        width: 42px;
        height: 42px;
        padding: 0;
        border-radius: 50%;
        justify-content: center;
    }

    .quote-btn .quote-text {
        display: none;
    }

    .quote-btn .quote-icon {
        display: inline-block;
        font-size: 1rem;
    }
}

/* ===== MOBILE CTA FIX - FORCE ICON MODE ===== */
@media (max-width: 480px) {
    .header .quote-btn {
        width: 42px !important;
        height: 42px !important;
        padding: 0 !important;
        border-radius: 50% !important;

        display: flex !important;
        align-items: center !important;
        justify-content: center !important;
    }

    .header .quote-btn .quote-text {
        display: none !important;
    }

    .header .quote-btn .quote-icon {
        display: block !important;
        font-size: 1rem;
        line-height: 1;
    }
}