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

:root {
    /* Light theme colors */
    --bg-primary: #f9fafb;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f3f4f6;
    --text-primary: #0A0A0A;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --border-color: #e5e7eb;
    --accent-blue: #D97706;
    --accent-blue-hover:#D97706;;
    --accent-green: #059669;
    --accent-purple: #7c3aed;
    --accent-orange: #ea580c;
    --accent-red: #dc2626;
    --accent-yellow: #d97706;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    /* Dark theme colors */
    --bg-primary-dark: #0A0A0A;
    --bg-secondary-dark: #0A0A0A;
    --bg-card-dark: #0A0A0A;
    --text-primary-dark: #ffffff;
    --text-secondary-dark: #b3b3b3;
    --text-muted-dark: #868e96;
    --border-color-dark: #4a4a4a;
    --accent-color-dark: #F59E0B;
    --accent-light-dark: #D97706;
    --primary-dark: #F59E0B;
    --primary-hover-dark: #D97706;
}

[data-theme="dark"] {
    /* Dark theme colors */
    --bg-primary: var(--bg-primary-dark);
    --bg-secondary: var(--bg-secondary-dark);
    --bg-tertiary: var(--bg-card-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --text-muted: var(--text-muted-dark);
    --border-color: var(--border-color-dark);
    --accent-blue: var(--accent-color-dark);
    --accent-blue-hover: var(--accent-light-dark);
    --accent-green: var(--accent-color-dark);
    --accent-purple: var(--accent-color-dark);
    --accent-orange: var(--primary-dark);
    --accent-red: var(--accent-color-dark);
    --accent-yellow: var(--primary-dark);
    --accent-color: var(--accent-color-dark);
    --accent-light: var(--accent-light-dark);
    --bg-secondary: #0A0A0A;
    --bg-tertiary: #374151;
    --text-primary: #f9fafb;
    --text-secondary: #d1d5db;
    --text-muted: #9ca3af;
    --border-color: #374151;
    --accent-blue: #D97706;
    --accent-blue-hover: #D97706;
    --accent-green: #10b981;
    --accent-purple: #8b5cf6;
    --accent-orange: #f97316;
    --accent-red: #ef4444;
    --accent-yellow: #f59e0b;
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3), 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    max-width: 1024px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header Styles */
.header {
    position: sticky;
    top: 0;
    z-index: 50;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

[data-theme="dark"] .header {
    background-color: rgba(31, 41, 55, 0.8);
}

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

.logo-section {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    background-color: var(--accent-blue);
    border-radius: 0.5rem;
    color: white;
    font-size: 1.25rem;
}

.logo-text h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.125rem;
}

.logo-text p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.theme-toggle {
    padding: 0.5rem;
    border-radius: 0.5rem;
    background-color: var(--bg-tertiary);
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--border-color);
    transform: scale(1.05);
}

/* Main Content */
.main-content {
    padding: 2rem 0;
}

.page-title {
    text-align: center;
    margin-bottom: 2rem;
}

.page-title h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.page-title p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 32rem;
    margin: 0 auto;
}

/* Table of Contents */
.table-of-contents {
    background-color: var(--bg-secondary);
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

.toc-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.toc-header i {
    color: var(--accent-blue);
    font-size: 1.25rem;
}

.toc-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.toc-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toc-item {
    display: flex;
    align-items: flex-start;
    padding: 0.5rem;
    border-radius: 0.375rem;
    text-decoration: none;
    transition: all 0.2s ease;
}

.toc-item:hover {
    background-color: var(--bg-tertiary);
}

.toc-number {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--accent-blue);
    margin-right: 0.75rem;
    margin-top: 0.125rem;
    min-width: 1.5rem;
}

.toc-title {
    font-size: 0.875rem;
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

.toc-item:hover .toc-title {
    color: var(--accent-blue);
}

/* Section Styles */
.section {
    margin-bottom: 3rem;
    scroll-margin-top: 6rem;
}

.section-header {
    border-left: 4px solid var(--accent-blue);
    padding-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.section-header h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.section-number {
    color: var(--accent-blue);
    margin-right: 0.5rem;
}

.section-divider {
    width: 4rem;
    height: 2px;
    background-color: var(--accent-blue);
}

.section-content {
    line-height: 1.7;
}

.section-content p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.section-content ul {
    list-style: disc;
    margin-left: 1.5rem;
    margin-bottom: 1rem;
}

.section-content li {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.section-content h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.section-content h4 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

/* Icon Content */
.icon-content {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.section-icon {
    font-size: 1.5rem;
    color: var(--accent-blue);
    margin-top: 0.25rem;
}

.section-icon.green {
    color: var(--accent-green);
}

/* Notice Boxes */
.notice-box {
    border-radius: 0.5rem;
    padding: 1rem;
    margin: 1rem 0;
    border: 1px solid;
}

.notice-box.warning {
    background-color: rgba(251, 191, 36, 0.1);
    border-color: rgba(251, 191, 36, 0.3);
    color: var(--accent-yellow);
}

.notice-box.error {
    background-color: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
    color: var(--accent-red);
}

.notice-box.info {
    background-color: rgba(59, 130, 246, 0.1);
    border-color: rgba(59, 130, 246, 0.3);
    color: var(--accent-blue);
}

.notice-box.neutral {
    background-color: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-secondary);
}

.notice-box.success {
    background-color: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--accent-green);
}

.notice-box.large {
    padding: 1.5rem;
}

.notice-box h4 {
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.notice-box ul {
    margin-top: 0.75rem;
}

/* Responsibility Grid */
.responsibility-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

.responsibility-card {
    border-radius: 0.5rem;
    padding: 1rem;
    border: 1px solid;
}

.responsibility-card.success {
    background-color: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
}

.responsibility-card.error {
    background-color: rgba(239, 68, 68, 0.1);
    border-color: rgba(239, 68, 68, 0.3);
}

.responsibility-card h4 {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.responsibility-card.success h4 {
    color: var(--accent-green);
}

.responsibility-card.error h4 {
    color: var(--accent-red);
}

.responsibility-card ul {
    list-style: none;
    margin: 0;
}

.responsibility-card li {
    font-size: 0.875rem;
    margin-bottom: 0.25rem;
}

.responsibility-card.success li {
    color: var(--accent-green);
}

.responsibility-card.error li {
    color: var(--accent-red);
}

/* Services Grid */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.service-card {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1.5rem;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.service-title {
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.service-title.blue {
    color: var(--accent-blue);
}

.service-title.green {
    color: var(--accent-green);
}

.service-title.purple {
    color: var(--accent-purple);
}

.service-card p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Privacy Grid */
.privacy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1rem;
    margin: 1rem 0;
}

.privacy-card {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    padding: 1rem;
}

.privacy-card h4 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.privacy-card p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Dispute Steps */
.dispute-steps {
    margin: 1rem 0;
}

.dispute-step {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 1.5rem;
    height: 1.5rem;
    background-color: var(--accent-blue);
    color: white;
    font-size: 0.875rem;
    font-weight: 700;
    border-radius: 50%;
    flex-shrink: 0;
}

.step-content h4 {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.step-content p {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Contact Card */
.contact-card {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(99, 102, 241, 0.1));
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 0.5rem;
    padding: 1.5rem;
    margin: 1rem 0;
}

.contact-info {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.contact-icon {
    font-size: 2rem;
    color: var(--accent-blue);
}

.contact-info h4 {
    font-weight: 600;
    color: var(--accent-blue);
    margin-bottom: 0.25rem;
}

.contact-email {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 500;
    font-size: 1.125rem;
    transition: color 0.2s ease;
}

.contact-email:hover {
    color: var(--accent-blue-hover);
}

.contact-note {
    font-size: 0.875rem;
    color: var(--accent-blue);
    margin: 0;
}

/* Terms Footer */
.terms-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 2rem;
    margin-top: 3rem;
    text-align: center;
}

.terms-footer p {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

/* Theme Toggle */
.theme-toggle-container {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
}

.theme-toggle {
    background: none;
    border: none;
    padding: 10px;
    cursor: pointer;
    color: var(--text-primary);
    transition: color 0.3s ease;
}

.theme-toggle:hover {
    color: var(--accent-color);
}

[data-theme="dark"] {
    --bg-primary: var(--bg-primary-dark);
    --bg-secondary: var(--bg-secondary-dark);
    --bg-card: var(--bg-card-dark);
    --text-primary: var(--text-primary-dark);
    --text-secondary: var(--text-secondary-dark);
    --text-muted: var(--text-muted-dark);
    --border-color: var(--border-color-dark);
    --accent-color: var(--accent-color-dark);
    --accent-light: var(--accent-light-dark);
    --primary: var(--primary-dark);
    --primary-hover: var(--primary-hover-dark);
}

[data-theme="dark"] .theme-toggle {
    color: var(--text-primary-dark);
}

[data-theme="dark"] .theme-toggle:hover {
    color: var(--accent-color-dark);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: 50;
    padding: 0.75rem;
    border-radius: 50%;
    background-color: var(--accent-blue);
    color: white;
    border: none;
    box-shadow: var(--shadow-lg);
    cursor: pointer;
    opacity: 0;
    transform: translateY(2.5rem);
    transition: all 0.3s ease;
    pointer-events: none;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.back-to-top:hover {
    background-color: var(--accent-blue-hover);
    transform: translateY(-2px);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 0.75rem;
    }
    
    .page-title h1 {
        font-size: 2rem;
    }
    
    .page-title p {
        font-size: 1rem;
    }
    
    .section-header h2 {
        font-size: 1.25rem;
    }
    
    .services-grid,
    .responsibility-grid,
    .privacy-grid {
        grid-template-columns: 1fr;
    }
    
    .icon-content {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .section-icon {
        align-self: flex-start;
    }
    
    .back-to-top {
        bottom: 1rem;
        right: 1rem;
    }
}

@media (max-width: 480px) {
    .header-content {
        padding: 0.75rem 0;
    }
    
    .logo-text h1 {
        font-size: 1.25rem;
    }
    
    .page-title h1 {
        font-size: 1.75rem;
    }
    
    .table-of-contents {
        padding: 1rem;
    }
    
    .section-header {
        padding-left: 1rem;
    }
    
    .contact-info {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Focus styles for accessibility */
.theme-toggle:focus,
.toc-item:focus,
.back-to-top:focus {
    outline: 2px solid var(--accent-blue);
    outline-offset: 2px;
}

/* Print styles */
@media print {
    .header,
    .back-to-top,
    .theme-toggle {
        display: none;
    }
    
    .main-content {
        padding: 0;
    }
    
    .section {
        break-inside: avoid;
    }
}