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

:root {
    /* Gaming-inspired color palette */
    --primary-color: #6B46FF;
    --secondary-color: #FF4655;
    --accent-color: #FFD700;
    --dark-bg: #0F0F1E;
    --card-bg: #1A1A2E;
    --text-primary: #FFFFFF;
    --text-secondary: #B8B8D1;
    --success: #4CAF50;
    --warning: #FFA726;
    --border-color: #2A2A3E;
    --hover-glow: 0 0 20px rgba(107, 70, 255, 0.5);
    --card-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, #0F0F1E 0%, #1A1A2E 100%);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

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

/* Typography and Spacing */
p {
    margin-bottom: 1.2em;
    line-height: 1.7;
}

ul, ol {
    margin-bottom: 1.5em;
    line-height: 1.8;
    padding-left: 1.5em;
}

li {
    margin-bottom: 0.5em;
    line-height: 1.7;
}

/* Content sections spacing */
section {
    margin-bottom: 2.5em;
}

.intro-section, .guide-overview, .tier-info {
    margin-bottom: 2rem;
}

.intro-section p {
    margin-bottom: 1.5em;
    font-size: 1.1em;
    line-height: 1.8;
}

.guide-overview ul li, .tier-info ul li {
    margin-bottom: 0.8em;
    line-height: 1.8;
}

h2 {
    margin-bottom: 1em;
    line-height: 1.4;
}

h3 {
    margin-bottom: 0.8em;
    margin-top: 1.5em;
    line-height: 1.4;
}

/* Header Styles */
.site-header {
    background: var(--card-bg);
    border-bottom: 2px solid var(--primary-color);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    background: rgba(26, 26, 46, 0.95);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
}

.site-title {
    font-size: 1.8rem;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin: 0;
}

/* Main Navigation */
.main-nav {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 6px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link:hover {
    color: var(--text-primary);
    background: rgba(107, 70, 255, 0.1);
}

.nav-link.active {
    color: var(--accent-color);
    background: rgba(255, 215, 0, 0.1);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 16px;
    right: 16px;
    height: 2px;
    background: var(--accent-color);
    border-radius: 1px;
}

/* Language Switcher - Positioned in top right */
.language-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
}

.current-lang {
    padding: 12px 20px;
    background: var(--primary-color);
    border-radius: 8px;
    cursor: pointer;
    display: inline-block;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    box-shadow: var(--card-shadow);
    min-height: 40px;
    min-width: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.current-lang:hover {
    transform: translateY(-2px);
    box-shadow: var(--hover-glow);
}

.lang-dropdown {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 10px;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    min-width: 200px;
    display: none;
    box-shadow: var(--card-shadow);
}

.language-switcher:hover .lang-dropdown {
    display: block;
}

.lang-dropdown a {
    display: block;
    padding: 14px 20px;
    color: var(--text-primary);
    text-decoration: none;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    min-height: 40px;
    display: flex;
    align-items: center;
}

.lang-dropdown a:hover {
    background: var(--primary-color);
    color: var(--text-primary);
}

/* Breadcrumb Navigation */
.breadcrumb {
    background: var(--card-bg);
    padding: 12px 0;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9rem;
}

.breadcrumb-nav {
    display: flex;
    align-items: center;
    color: var(--text-secondary);
}

.breadcrumb-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.breadcrumb-nav a:hover {
    color: var(--primary-color);
}

.breadcrumb-nav .current {
    color: var(--text-primary);
    font-weight: 500;
}

.breadcrumb-sep {
    margin: 0 8px;
    color: var(--border-color);
}

/* Hero Section */
.hero-section {
    padding: 60px 0;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    margin-bottom: 15px;
    background: linear-gradient(90deg, var(--accent-color), var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

/* Language Grid */
.language-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin-top: 40px;
}

.lang-card {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 30px;
    text-decoration: none;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
}

.lang-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(107, 70, 255, 0.3), transparent);
    transition: left 0.6s ease;
}

.lang-card:hover::before {
    left: 100%;
}

.lang-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--hover-glow);
}

.lang-card .flag {
    font-size: 3rem;
    display: block;
    margin-bottom: 15px;
}

.lang-card h3 {
    color: var(--text-primary);
    font-size: 1.3rem;
    margin-bottom: 8px;
}

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

/* Quick Links Section */
.quick-links {
    padding: 60px 0;
    background: rgba(15, 15, 30, 0.5);
}

.quick-links h2 {
    text-align: center;
    font-size: 2rem;
    margin-bottom: 40px;
    color: var(--accent-color);
}

.links-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.resource-card {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 25px;
    text-align: center;
    text-decoration: none;
    transition: all 0.3s ease;
}

.resource-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.3);
}

.resource-card .icon {
    font-size: 2.5rem;
    display: block;
    margin-bottom: 15px;
}

.resource-card h3 {
    color: var(--text-primary);
    font-size: 1.2rem;
    margin-bottom: 8px;
}

.resource-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Footer */
.site-footer {
    background: var(--card-bg);
    border-top: 2px solid var(--border-color);
    padding: 30px 0;
    margin-top: 80px;
}

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

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

.footer-nav a {
    color: var(--text-secondary);
    text-decoration: none;
    margin: 0 15px;
    transition: color 0.3s ease;
}

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

/* Status Alert Banner (for codes pages) */
.status-banner {
    background: linear-gradient(90deg, var(--secondary-color), var(--primary-color));
    padding: 15px;
    text-align: center;
    margin-bottom: 30px;
    border-radius: 8px;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.9; }
}

.status-banner strong {
    font-size: 1.2rem;
    color: var(--text-primary);
}

/* Code Cards (for codes pages) */
.codes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.code-card {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    position: relative;
}

.code-card.featured {
    border-color: var(--accent-color);
    box-shadow: 0 0 20px rgba(255, 215, 0, 0.2);
}

.code-value {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent-color);
    font-family: 'Courier New', monospace;
    margin-bottom: 10px;
}

.code-reward {
    color: var(--text-secondary);
    margin-bottom: 15px;
}

.copy-button {
    background: var(--primary-color);
    color: var(--text-primary);
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    transition: all 0.3s ease;
    width: 100%;
    min-height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.copy-button:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--hover-glow);
}

/* Responsive Design */
@media (max-width: 768px) {
    .site-title {
        font-size: 1.3rem;
    }

    .hero-title {
        font-size: 1.8rem;
    }

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

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

    .footer-nav a {
        display: block;
        margin: 5px 0;
    }

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

    /* Mobile language switcher adjustments */
    .language-switcher {
        top: 15px;
        right: 15px;
    }

    .current-lang {
        padding: 6px 12px;
        font-size: 0.8rem;
    }

    .lang-dropdown {
        min-width: 180px;
    }

    .lang-dropdown a {
        padding: 10px 12px;
        font-size: 0.8rem;
    }

    /* Add some top padding to avoid language switcher overlap */
    .site-header {
        padding-top: 20px;
    }
}

/* Accessibility */
a:focus,
button:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Live List (Google Sheets iframe) Styles */
.live-list {
    margin-block: 24px 32px;
}
.live-list .muted {
    color: #6b7280;
    font-size: 0.95rem;
    margin: 6px 0 14px;
}
.expired-codes summary {
    cursor: pointer;
    color: #374151;
    margin: 16px 0;
    padding: 8px;
    background: var(--card-bg);
    border-radius: 6px;
    border: 1px solid var(--border-color);
}
.expired-codes[open] summary {
    font-weight: 600;
    background: var(--primary-color);
    color: var(--text-primary);
}

/* Sources Grid Styles */
.sources-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 30px;
    margin-top: 20px;
}

.source-category {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    border: 2px solid var(--border-color);
}

.source-category h3 {
    color: var(--primary-color);
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.source-category ul {
    list-style: none;
    padding: 0;
}

.source-category li {
    margin-bottom: 10px;
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.source-category li:last-child {
    border-bottom: none;
}

.source-category strong {
    color: var(--accent-color);
}

/* Table Styles (for codes pages) */
.table-container {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 20px;
    margin: 30px 0;
    border: 2px solid var(--border-color);
    overflow-x: auto;
}

.table-container iframe {
    width: 100%;
    min-height: 400px;
    border: none;
    border-radius: 8px;
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 14px;
    min-width: 600px;
}

th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
}

th {
    background: var(--primary-color);
    color: var(--text-primary);
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 10;
}

td {
    color: var(--text-primary);
    background: var(--card-bg);
}

tr:hover td {
    background: rgba(107, 70, 255, 0.1);
}

/* Status Badge Styles */
.status-badge {
    padding: 4px 8px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.status-working {
    background: var(--success);
    color: white;
}

.status-expiring {
    background: var(--warning);
    color: white;
}

.status-expired {
    background: #666666;
    color: white;
}

/* Collapsible Section Styles */
.collapsible-section {
    margin: 30px 0;
}

.collapsible-header {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 15px 20px;
    cursor: pointer;
    transition: all 0.3s ease;
    user-select: none;
}

.collapsible-header:hover {
    border-color: var(--primary-color);
    background: rgba(107, 70, 255, 0.1);
}

.collapsible-header h3 {
    margin: 0;
    color: var(--text-primary);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.collapsible-header .toggle-icon {
    transition: transform 0.3s ease;
}

.collapsible-section.open .toggle-icon {
    transform: rotate(180deg);
}

.collapsible-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.collapsible-section.open .collapsible-content {
    max-height: 1000px;
}

/* How to Redeem Styles */
.redeem-steps {
    display: grid;
    gap: 30px;
    margin-top: 30px;
}

.step {
    display: flex;
    align-items: flex-start;
    gap: 20px;
    padding: 25px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.step:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.step-number {
    background: var(--primary-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.step-content h3 {
    color: var(--text-primary);
    margin: 0 0 8px 0;
    font-size: 1.2rem;
}

.step-content p {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* FAQ / Troubleshooting Styles */
.faq-list {
    display: grid;
    gap: 20px;
    margin-top: 30px;
}

.faq-item {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.faq-item h3 {
    color: var(--text-primary);
    margin: 0 0 10px 0;
    font-size: 1.1rem;
}

.faq-item p {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* Sources Grid */
.sources-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.source-item {
    background: var(--card-bg);
    padding: 20px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    text-align: center;
    transition: all 0.3s ease;
}

.source-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

.source-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: 10px;
}

.source-item h3 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin: 0 0 8px 0;
}

.source-item p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.9rem;
}

.verification-note {
    background: rgba(107, 70, 255, 0.1);
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
    margin-top: 20px;
}

.verification-note em {
    color: var(--text-primary);
    font-style: normal;
}

/* Hero Introduction */
.hero-intro {
    background: var(--card-bg);
    padding: 25px;
    border-radius: 12px;
    border: 2px solid var(--border-color);
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1.1rem;
    margin-top: 20px;
}

/* Responsive Design Updates */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        gap: 15px;
        text-align: center;
    }

    .main-nav {
        gap: 20px;
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-link {
        padding: 6px 12px;
        font-size: 0.9rem;
    }

    .site-title {
        font-size: 1.5rem;
    }

    .step {
        flex-direction: column;
        text-align: center;
        gap: 15px;
    }

    .sources-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .redeem-steps {
        gap: 20px;
    }

    /* Mobile adjustments for iframe */
    .live-list iframe {
        height: 520px;       /* 小屏稍降高度，避免双滚动过长 */
    }
}

/* Print Styles */
@media print {
    .site-header,
    .language-switcher,
    .site-footer {
        display: none;
    }

    body {
        background: white;
        color: black;
    }
}