:root {
    /* Colors */
    --bg-dark: #0f172a;
    --bg-surface: #1e293b;
    --bg-surface-hover: #334155;
    --border-color: #334155;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --accent-primary: #0ea5e9;
    --accent-primary-hover: #38bdf8;
    --accent-secondary: #6366f1;
    
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    
    /* Typography */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    
    /* Metrics */
    --sidebar-width: 280px;
    --header-height: 70px;
    --border-radius: 12px;
    --transition-speed: 0.2s;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent-primary);
    text-decoration: none;
    transition: color var(--transition-speed);
}

a:hover {
    color: var(--accent-primary-hover);
}

/* App Layout */
.app-container {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background-color: rgba(30, 41, 59, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
}

.sidebar-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    border-bottom: 1px solid var(--border-color);
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.025em;
    color: #fff;
}

.logo-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: 8px;
    color: white;
    font-size: 1.2rem;
}

.version-badge {
    background-color: var(--bg-surface-hover);
    color: var(--text-secondary);
    font-size: 0.75rem;
    padding: 2px 8px;
    border-radius: 99px;
    font-weight: 600;
}

.sidebar-nav {
    flex: 1;
    overflow-y: auto;
    padding: 24px 16px;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.sidebar-nav::-webkit-scrollbar {
    width: 4px;
}

.sidebar-nav::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.nav-heading {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 8px;
    padding: 0 12px;
    font-weight: 600;
}

.nav-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 8px 12px;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-weight: 500;
    transition: all var(--transition-speed);
}

.nav-link i {
    font-size: 1.1rem;
    color: var(--text-muted);
    transition: color var(--transition-speed);
}

.nav-link:hover {
    background-color: var(--bg-surface);
    color: var(--text-primary);
}

.nav-link:hover i {
    color: var(--text-secondary);
}

.nav-link.active {
    background-color: rgba(14, 165, 233, 0.1);
    color: var(--accent-primary);
}

.nav-link.active i {
    color: var(--accent-primary);
}

.sidebar-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
}

.back-link {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
}

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

/* Main Content */
.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
}

/* Topbar */
.topbar {
    height: var(--header-height);
    background-color: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.5rem;
    cursor: pointer;
}

.search-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    background-color: var(--bg-surface);
    padding: 8px 16px;
    border-radius: 99px;
    width: 300px;
    border: 1px solid transparent;
    transition: border-color var(--transition-speed);
}

.search-bar:focus-within {
    border-color: var(--accent-primary);
}

.search-bar i {
    color: var(--text-muted);
}

.search-bar input {
    background: none;
    border: none;
    outline: none;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.9rem;
    width: 100%;
}

.search-bar input::placeholder {
    color: var(--text-muted);
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: rgba(16, 185, 129, 0.1);
    color: var(--success);
    padding: 6px 12px;
    border-radius: 99px;
    font-size: 0.85rem;
    font-weight: 600;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.status-dot {
    width: 8px;
    height: 8px;
    background-color: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--success);
}

/* Content Area */
.content-wrapper {
    padding: 48px 32px;
    max-width: 900px;
    margin: 0 auto;
    width: 100%;
}

/* Markdown Styling */
.markdown-body {
    color: var(--text-primary);
    font-size: 1.05rem;
}

.markdown-body h1, .markdown-body h2, .markdown-body h3, .markdown-body h4 {
    color: #fff;
    margin-top: 2em;
    margin-bottom: 0.75em;
    font-weight: 600;
    line-height: 1.3;
}

.markdown-body h1 {
    font-size: 2.25rem;
    margin-top: 0;
    letter-spacing: -0.025em;
    background: linear-gradient(135deg, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.markdown-body h2 {
    font-size: 1.75rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.3em;
}

.markdown-body h3 {
    font-size: 1.35rem;
}

.markdown-body p {
    margin-bottom: 1.25em;
    color: var(--text-secondary);
}

.markdown-body ul, .markdown-body ol {
    margin-bottom: 1.25em;
    padding-left: 24px;
    color: var(--text-secondary);
}

.markdown-body li {
    margin-bottom: 0.5em;
}

.markdown-body code {
    font-family: var(--font-mono);
    background-color: var(--bg-surface);
    padding: 0.2em 0.4em;
    border-radius: 6px;
    font-size: 0.85em;
    color: #fff;
}

.markdown-body pre {
    background-color: #0d1117; /* Darker background for code blocks */
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 16px;
    overflow-x: auto;
    margin-bottom: 0;
}

.markdown-body pre code {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
    font-size: 0.9em;
    color: inherit;
}

/* Code Block Wrapper */
.code-block-wrapper {
    position: relative;
    margin-bottom: 1.5em;
}

.copy-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    background-color: rgba(30, 41, 59, 0.8);
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: 6px 10px;
    border-radius: 6px;
    font-size: 0.8rem;
    font-family: var(--font-sans);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 4px;
    transition: all 0.2s;
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    opacity: 0; /* Hide by default */
}

.code-block-wrapper:hover .copy-btn {
    opacity: 1; /* Show on hover */
}

.copy-btn:hover {
    background-color: var(--bg-surface-hover);
    color: #fff;
}

.copy-btn.copied {
    background-color: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--success);
    opacity: 1;
}

.markdown-body blockquote {
    border-left: 4px solid var(--accent-primary);
    background-color: rgba(14, 165, 233, 0.05);
    padding: 16px 24px;
    margin-bottom: 1.5em;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    color: var(--text-secondary);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.4s ease-out forwards;
}

/* Responsive */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-speed);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .topbar {
        padding: 0 16px;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    .search-bar {
        display: none; /* Hide on mobile to save space */
    }
    
    .content-wrapper {
        padding: 32px 24px;
    }
}

/* --- Agreement Modal --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background-color: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal-overlay.show {
    opacity: 1;
    visibility: visible;
}

.modal-card {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    transform: translateY(20px) scale(0.95);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.modal-overlay.show .modal-card {
    transform: translateY(0) scale(1);
}

.modal-card::-webkit-scrollbar {
    width: 6px;
}
.modal-card::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 6px;
}

.modal-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    gap: 16px;
}

.modal-icon {
    width: 48px;
    height: 48px;
    background-color: var(--accent-primary);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
}

.modal-header h2 {
    font-size: 1.5rem;
    color: #fff;
    margin: 0;
    letter-spacing: -0.025em;
}

.modal-intro {
    padding: 24px 24px 16px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.modal-terms {
    padding: 0 24px 24px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.term-item {
    background-color: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 16px;
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.term-icon {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    flex-shrink: 0;
    color: white;
}

.term-icon.bg-blue { background-color: var(--accent-primary); }
.term-icon.bg-red { background-color: var(--danger); }

.term-item p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.term-item strong {
    color: var(--accent-primary);
}

.term-item .bg-red + p strong {
    color: var(--danger);
}

.text-danger { color: var(--danger); }
.font-bold { font-weight: 700; }

.modal-footer {
    padding: 24px;
    background-color: rgba(15, 23, 42, 0.8);
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 20px;
    border-radius: 0 0 16px 16px;
}

.checkbox-container {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    background-color: rgba(30, 41, 59, 0.5);
    padding: 16px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: background-color 0.2s;
}

.checkbox-container:hover {
    background-color: var(--bg-surface-hover);
}

.checkbox-container input {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--accent-primary);
}

.checkbox-label {
    font-weight: 600;
    color: #fff;
    font-size: 0.95rem;
}

.btn-primary {
    background-color: var(--accent-primary);
    color: white;
    border: none;
    padding: 16px;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    transition: all 0.2s;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--accent-primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(14, 165, 233, 0.3);
}

.btn-primary:disabled {
    background-color: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
    opacity: 0.7;
}

/* --- License Striped Blocks --- */
.license-container {
    display: flex;
    flex-direction: column;
    gap: 32px;
    margin-top: 24px;
}

.license-block {
    background-color: var(--bg-surface);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.license-block-header {
    background-color: #ffffff; /* White to match the image and support logos */
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
}

.license-block-header img {
    height: 40px;
    max-width: 200px;
    object-fit: contain;
}

.license-block-row {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
}

.license-block-row:last-child {
    border-bottom: none;
}

.license-block-row.text-row {
    background-color: var(--bg-surface);
    color: var(--text-primary);
    font-size: 0.95rem;
}

.license-block-row.code-row {
    background-color: rgba(0, 0, 0, 0.2); /* Darker background for code */
    font-family: var(--font-mono);
    color: #c4b5fd; /* Purple-ish text like the image */
    font-size: 0.9rem;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.license-block-row.code-row code {
    background: none;
    padding: 0;
    color: inherit;
    word-break: break-all;
}

.license-block-row.code-row .copy-btn {
    position: static;
    opacity: 0;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.license-block-row.code-row:hover .copy-btn {
    opacity: 1;
}

@media (max-width: 768px) {
    .license-block-row.code-row {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }
    
    .license-block-row.code-row .copy-btn {
        opacity: 1;
        align-self: flex-end;
    }
}