/*
Theme Name: K8VN21 Theme
Theme URI: https://k8vn21.com
Author: K8VN21 Team
Author URI: https://k8vn21.com
Description: Theme chuyen nghiep cho nha cai K8 voi thiet ke hien dai, toi uu SEO
Version: 1.0.0
License: GPL v2 or later
License URI: https://www.gnu.org/licenses/gpl-2.0.html
Text Domain: k8vn21
Domain Path: /languages
Tags: casino, betting, responsive, seo-friendly, vietnamese
*/

/* ========================================
   CSS RESET & BASE
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f5f5f5;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

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

ul, ol {
    list-style: none;
}

/* ========================================
   VARIABLES
   ======================================== */
:root {
    --primary-color: #1a237e;
    --primary-dark: #0d1642;
    --secondary-color: #ffc107;
    --secondary-dark: #ffa000;
    --accent-color: #ff5722;
    --text-dark: #212121;
    --text-light: #757575;
    --bg-light: #f5f5f5;
    --bg-white: #ffffff;
    --border-color: #e0e0e0;
    --success-color: #4caf50;
    --error-color: #f44336;
    --shadow: 0 2px 10px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 30px rgba(0,0,0,0.15);
    --radius: 8px;
    --radius-lg: 16px;
    --transition: all 0.3s ease;
}

/* ========================================
   LAYOUT
   ======================================== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.container-fluid {
    width: 100%;
    padding: 0 20px;
}

.row {
    display: flex;
    flex-wrap: wrap;
    margin: 0 -15px;
}

.col {
    flex: 1;
    padding: 0 15px;
}

.col-6 { flex: 0 0 50%; max-width: 50%; }
.col-4 { flex: 0 0 33.333%; max-width: 33.333%; }
.col-3 { flex: 0 0 25%; max-width: 25%; }

/* ========================================
   HEADER
   ======================================== */
.site-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.site-branding {
    display: flex;
    align-items: center;
}

.site-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--secondary-color);
    text-transform: uppercase;
    letter-spacing: 2px;
}

.site-title span {
    color: var(--bg-white);
}

.main-navigation {
    display: flex;
    align-items: center;
}

.nav-menu {
    display: flex;
    gap: 5px;
}

.nav-menu li a {
    display: block;
    padding: 10px 20px;
    color: var(--bg-white);
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: var(--radius);
    text-transform: capitalize;
}

.nav-menu li a:hover,
.nav-menu li.current-menu-item a {
    background-color: var(--secondary-color);
    color: var(--primary-dark);
}

.header-actions {
    display: flex;
    gap: 10px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    text-transform: capitalize;
}

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

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

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

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

.btn-lg {
    padding: 14px 32px;
    font-size: 1.1rem;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--bg-white);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 10px;
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 150px 0 100px;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('assets/images/pattern.png') repeat;
    opacity: 0.05;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 800;
    color: var(--bg-white);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-title span {
    color: var(--secondary-color);
}

.hero-description {
    font-size: 1.2rem;
    color: rgba(255,255,255,0.9);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   SECTIONS
   ======================================== */
.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 20px;
    text-transform: capitalize;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-light);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 50px;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

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

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

.bg-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--bg-white);
}

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

/* ========================================
   CARDS
   ======================================== */
.card {
    background-color: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 30px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    height: 100%;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    font-size: 1.8rem;
    color: var(--secondary-color);
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 15px;
    text-transform: capitalize;
}

.card-text {
    color: var(--text-light);
    line-height: 1.7;
}

/* ========================================
   FEATURES
   ======================================== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.feature-item {
    display: flex;
    gap: 20px;
    padding: 25px;
    background-color: var(--bg-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.feature-item:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    background-color: rgba(26, 35, 126, 0.1);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--primary-color);
}

.feature-content h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
    text-transform: capitalize;
}

.feature-content p {
    color: var(--text-light);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* ========================================
   STEPS
   ======================================== */
.steps-container {
    display: flex;
    justify-content: space-between;
    gap: 30px;
    flex-wrap: wrap;
}

.step-item {
    flex: 1;
    min-width: 200px;
    text-align: center;
    position: relative;
}

.step-item:not(:last-child)::after {
    content: '';
    position: absolute;
    top: 40px;
    right: -15px;
    width: 30px;
    height: 2px;
    background-color: var(--secondary-color);
}

.step-number {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--secondary-color);
    border: 4px solid var(--secondary-color);
}

.step-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 10px;
    text-transform: capitalize;
}

.step-description {
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ========================================
   FAQ
   ======================================== */
.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background-color: var(--bg-white);
    border-radius: var(--radius);
    margin-bottom: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.faq-question {
    padding: 20px 25px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-dark);
    transition: var(--transition);
}

.faq-question:hover {
    background-color: rgba(26, 35, 126, 0.05);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary-color);
    transition: var(--transition);
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    padding: 0 25px;
    max-height: 0;
    overflow: hidden;
    transition: var(--transition);
}

.faq-item.active .faq-answer {
    padding: 0 25px 20px;
    max-height: 500px;
}

.faq-answer p {
    color: var(--text-light);
    line-height: 1.7;
}

/* ========================================
   CTA
   ======================================== */
.cta-section {
    padding: 80px 0;
    text-align: center;
}

.cta-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-transform: capitalize;
}

.cta-description {
    font-size: 1.2rem;
    margin-bottom: 40px;
    opacity: 0.9;
}

/* ========================================
   FOOTER
   ======================================== */
.site-footer {
    background: linear-gradient(135deg, var(--primary-dark) 0%, #0a0f2e 100%);
    color: var(--bg-white);
    padding: 60px 0 20px;
}

.footer-widgets {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-widget h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 20px;
    color: var(--secondary-color);
    text-transform: capitalize;
}

.footer-widget p {
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    margin-bottom: 15px;
}

.footer-widget ul li {
    margin-bottom: 10px;
}

.footer-widget ul li a {
    color: rgba(255,255,255,0.7);
    transition: var(--transition);
}

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

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}

.footer-copyright {
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
}

.footer-seo-text {
    background-color: rgba(255,255,255,0.05);
    padding: 20px;
    border-radius: var(--radius);
    margin-top: 30px;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.6);
    line-height: 1.8;
}

/* ========================================
   PAGE CONTENT
   ======================================== */
.page-content {
    padding: 120px 0 80px;
    min-height: 600px;
}

.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    padding: 150px 0 80px;
    text-align: center;
    color: var(--bg-white);
}

.page-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    text-transform: capitalize;
}

.page-description {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto;
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--bg-white);
    padding: 50px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.content-wrapper h2 {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 40px 0 20px;
    text-transform: capitalize;
}

.content-wrapper h3 {
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--text-dark);
    margin: 30px 0 15px;
    text-transform: capitalize;
}

.content-wrapper p {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 20px;
}

.content-wrapper ul,
.content-wrapper ol {
    margin-bottom: 20px;
    padding-left: 25px;
}

.content-wrapper ul li,
.content-wrapper ol li {
    color: var(--text-light);
    line-height: 1.8;
    margin-bottom: 10px;
}

.content-wrapper ul li {
    list-style-type: disc;
}

.content-wrapper ol li {
    list-style-type: decimal;
}

/* ========================================
   LOGIN PAGE
   ======================================== */
.login-container {
    max-width: 500px;
    margin: 0 auto;
    background-color: var(--bg-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.login-title {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-dark);
    text-align: center;
    margin-bottom: 30px;
    text-transform: capitalize;
}

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

.form-label {
    display: block;
    font-weight: 500;
    color: var(--text-dark);
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 1rem;
    transition: var(--transition);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-submit {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: var(--bg-white);
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    text-transform: capitalize;
}

.form-submit:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.login-links {
    text-align: center;
    margin-top: 20px;
}

.login-links a {
    color: var(--primary-color);
    font-weight: 500;
}

.login-links a:hover {
    text-decoration: underline;
}

/* ========================================
   PROMOTION CARDS
   ======================================== */
.promo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.promo-card {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: var(--radius-lg);
    padding: 35px;
    color: var(--bg-white);
    position: relative;
    overflow: hidden;
}

.promo-card::before {
    content: '';
    position: absolute;
    top: -50px;
    right: -50px;
    width: 150px;
    height: 150px;
    background-color: rgba(255,255,255,0.1);
    border-radius: 50%;
}

.promo-badge {
    display: inline-block;
    background-color: var(--secondary-color);
    color: var(--primary-dark);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.promo-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    text-transform: capitalize;
}

.promo-description {
    opacity: 0.9;
    margin-bottom: 25px;
    line-height: 1.6;
}

.promo-value {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

/* ========================================
   GUIDE SECTIONS
   ======================================== */
.guide-section {
    margin-bottom: 50px;
}

.guide-section h2 {
    font-size: 1.6rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--secondary-color);
    display: inline-block;
    text-transform: capitalize;
}

.tip-box {
    background-color: rgba(255, 193, 7, 0.1);
    border-left: 4px solid var(--secondary-color);
    padding: 20px;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin: 25px 0;
}

.tip-box h4 {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 10px;
    text-transform: capitalize;
}

.warning-box {
    background-color: rgba(244, 67, 54, 0.1);
    border-left: 4px solid var(--error-color);
    padding: 20px;
    border-radius: 0 var(--radius) var(--radius) 0;
    margin: 25px 0;
}

/* ========================================
   CONTACT PAGE
   ======================================== */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}

.contact-info h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 20px;
    text-transform: capitalize;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 25px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--secondary-color);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.contact-details h4 {
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 5px;
    text-transform: capitalize;
}

.contact-details p {
    color: var(--text-light);
}

.contact-form-wrapper {
    background-color: var(--bg-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

/* ========================================
   RESPONSIVE
   ======================================== */
@media (max-width: 992px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 1.8rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .menu-toggle {
        display: block;
    }
    
    .main-navigation {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
        flex-direction: column;
        padding: 30px 20px;
        transition: var(--transition);
        overflow-y: auto;
    }
    
    .main-navigation.active {
        left: 0;
    }
    
    .nav-menu {
        flex-direction: column;
        width: 100%;
        gap: 10px;
    }
    
    .nav-menu li a {
        padding: 15px;
        font-size: 1.1rem;
    }
    
    .header-actions {
        flex-direction: column;
        width: 100%;
        margin-top: 20px;
    }
    
    .header-actions .btn {
        width: 100%;
    }
    
    .hero-section {
        padding: 120px 0 60px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
    }
    
    .section {
        padding: 60px 0;
    }
    
    .steps-container {
        flex-direction: column;
    }
    
    .step-item:not(:last-child)::after {
        display: none;
    }
    
    .content-wrapper {
        padding: 30px 20px;
    }
    
    .col-6,
    .col-4,
    .col-3 {
        flex: 0 0 100%;
        max-width: 100%;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.6rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .btn-lg {
        width: 100%;
    }
    
    .page-title {
        font-size: 1.8rem;
    }
    
    .cta-title {
        font-size: 1.8rem;
    }
}