/* 789wim Universal Styles - Tất cả styles chung cho website */
/* Mobile-first responsive design - Thiết kế đáp ứng ưu tiên di động */

/* CSS Reset and Base Styles - Reset CSS và Styles cơ bản */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color palette - Bảng màu */
    --primary-bg: #2E4057;
    --secondary-bg: #708090;
    --accent-bg: #808080;
    --light-text: #FAFAD2;
    --accent-text: #DEB887;
    --neutral: #C0C0C0;
    
    /* Typography - Kiểu chữ */
    --font-size-base: 62.5%; /* 10px */
    --line-height-base: 1.5rem;
    
    /* Spacing - Khoảng cách */
    --container-max: 430px;
    --padding-base: 1rem;
    --margin-base: 1rem;
    
    /* Animations - Hoạt ảnh */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    font-size: 1.4rem;
    line-height: var(--line-height-base);
    color: var(--light-text);
    background: linear-gradient(135deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
    min-height: 100vh;
    overflow-x: hidden;
    max-width: var(--container-max);
    margin: 0 auto;
}

/* Container and Layout - Container và Layout */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--padding-base);
}

/* Header Navigation - Điều hướng header */
.header {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: var(--container-max);
    background: rgba(46, 64, 87, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--accent-bg);
    z-index: 1000;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    min-height: 6rem;
}

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.logo-img {
    width: 24px;
    height: 24px;
    border-radius: 4px;
}

.site-name {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--accent-text);
    text-decoration: none;
    transition: var(--transition-fast);
}

.site-name:hover {
    color: var(--light-text);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.login-btn, .register-btn {
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 6px;
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.login-btn {
    background: transparent;
    color: var(--light-text);
    border: 1px solid var(--neutral);
}

.register-btn {
    background: linear-gradient(45deg, var(--accent-text), #f4d03f);
    color: var(--primary-bg);
}

.login-btn:hover, .register-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.menu-toggle {
    display: flex;
    flex-direction: column;
    width: 24px;
    height: 24px;
    cursor: pointer;
    justify-content: space-between;
}

.menu-toggle span {
    width: 100%;
    height: 2px;
    background: var(--light-text);
    transition: var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Navigation Menu - Menu điều hướng di động */
.nav-menu {
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: rgba(46, 64, 87, 0.98);
    backdrop-filter: blur(15px);
    border-bottom: 1px solid var(--accent-bg);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-smooth);
}

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

.nav-menu ul {
    list-style: none;
    padding: 1rem 0;
}

.nav-menu li {
    border-bottom: 1px solid rgba(192, 192, 192, 0.1);
}

.nav-menu a {
    display: block;
    padding: 1.2rem 2rem;
    color: var(--light-text);
    text-decoration: none;
    font-size: 1.4rem;
    transition: var(--transition-fast);
}

.nav-menu a:hover {
    background: rgba(222, 184, 135, 0.1);
    color: var(--accent-text);
}

/* Main Content - Nội dung chính */
.main-content {
    margin-top: 8rem;
    min-height: calc(100vh - 8rem);
    padding-bottom: 12rem;
}

/* Carousel Styles - Styles băng chuyền */
.carousel {
    position: relative;
    width: 100%;
    height: 200px;
    overflow: hidden;
    border-radius: 12px;
    margin: 2rem 0;
}

.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.5s ease;
    cursor: pointer;
}

.carousel-slide.active {
    opacity: 1;
}

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

.carousel-indicators {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 0.5rem;
}

.carousel-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: var(--transition-fast);
}

.carousel-indicator.active {
    background: var(--accent-text);
}

/* Section Styles - Styles phần */
.section {
    margin: 3rem 0;
    padding: 2rem;
    background: rgba(112, 128, 144, 0.1);
    border-radius: 12px;
    border: 1px solid rgba(192, 192, 192, 0.1);
}

.section-title {
    font-size: 2.2rem;
    font-weight: bold;
    color: var(--accent-text);
    margin-bottom: 1.5rem;
    text-align: center;
}

.section-content {
    line-height: 1.6;
    color: var(--light-text);
}

/* Game Grid - Lưới game */
.games-category {
    margin: 2rem 0;
}

.category-title {
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--accent-text);
    margin-bottom: 1rem;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.games-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.game-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1rem;
    background: rgba(46, 64, 87, 0.3);
    border-radius: 8px;
    border: 1px solid rgba(192, 192, 192, 0.2);
    transition: var(--transition-smooth);
    cursor: pointer;
    min-height: 44px;
}

.game-item:hover {
    transform: translateY(-2px);
    background: rgba(222, 184, 135, 0.1);
    border-color: var(--accent-text);
}

.game-item img {
    width: 40px;
    height: 40px;
    object-fit: cover;
    border-radius: 6px;
    margin-bottom: 0.5rem;
}

.game-item span {
    font-size: 1rem;
    color: var(--light-text);
    text-align: center;
    line-height: 1.2;
    word-break: break-word;
}

/* Promotional Links - Liên kết khuyến mãi */
.promo-link {
    display: inline-block;
    padding: 1rem 2rem;
    background: linear-gradient(45deg, var(--accent-text), #f4d03f);
    color: var(--primary-bg);
    text-decoration: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 1.4rem;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
    min-height: 44px;
    text-align: center;
}

.promo-link:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(222, 184, 135, 0.3);
}

.promo-text {
    color: var(--accent-text);
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

.promo-text:hover {
    color: var(--light-text);
    text-shadow: 0 0 8px var(--accent-text);
}

/* Footer Styles - Styles footer */
.footer {
    background: var(--primary-bg);
    border-top: 1px solid var(--accent-bg);
    padding: 3rem 0 12rem;
    margin-top: 4rem;
}

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

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 2rem;
}

.footer-links a {
    color: var(--light-text);
    text-decoration: none;
    font-size: 1.2rem;
    padding: 0.5rem;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--accent-text);
}

.partners {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
    margin: 2rem 0;
}

.partner-logo {
    width: 32px;
    height: 32px;
    opacity: 0.7;
    transition: var(--transition-fast);
}

.partner-logo:hover {
    opacity: 1;
}

.copyright {
    color: var(--neutral);
    font-size: 1.2rem;
    margin-top: 2rem;
}

/* Bottom Navigation - Điều hướng dưới */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: var(--container-max);
    background: rgba(46, 64, 87, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--accent-bg);
    z-index: 1000;
}

.bottom-nav-container {
    display: flex;
    justify-content: space-around;
    padding: 1rem 0;
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--light-text);
    font-size: 1rem;
    transition: var(--transition-fast);
    min-width: 44px;
    min-height: 44px;
    justify-content: center;
}

.bottom-nav-item:hover {
    color: var(--accent-text);
}

.bottom-nav-item i {
    font-size: 1.8rem;
    margin-bottom: 0.2rem;
}

/* Animations - Hoạt ảnh */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

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

/* Responsive Design - Thiết kế đáp ứng */
@media (min-width: 480px) {
    .games-grid {
        grid-template-columns: repeat(5, 1fr);
    }
    
    .game-item img {
        width: 50px;
        height: 50px;
    }
    
    .carousel {
        height: 250px;
    }
}

/* Utility Classes - Lớp tiện ích */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }

.p-1 { padding: 1rem; }
.p-2 { padding: 2rem; }

.d-none { display: none; }
.d-block { display: block; }
.d-flex { display: flex; }

.fw-bold { font-weight: bold; }
.fw-normal { font-weight: normal; }

/* Loading States - Trạng thái tải */
.loading {
    opacity: 0.5;
    pointer-events: none;
}

body:not(.loaded) .fade-in {
    opacity: 0;
}

/* Accessibility - Khả năng tiếp cận */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus States - Trạng thái focus */
button:focus,
a:focus,
.game-item:focus {
    outline: 2px solid var(--accent-text);
    outline-offset: 2px;
}