:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --sidebar-width: 280px;
}

/* Dark mode overrides */
[data-theme="dark"] {
    --bg-primary: #1e2433;
    --bg-secondary: #161b27;
    --bg-tertiary: #252d3d;
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --border-color: #2d3748;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.3);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.5);
}
[data-theme="dark"] .info-box    { background: #1e2d45; border-color: #2563eb55; }
[data-theme="dark"] .success-box { background: #14291e; border-color: #10b98155; }
[data-theme="dark"] .warning-box { background: #2a2010; border-color: #f59e0b55; }
[data-theme="dark"] .step-header { background: linear-gradient(135deg, #1e40af 0%, #1e3a8a 100%); }
[data-theme="dark"] .code-block  { background: #0d1117; }
[data-theme="dark"] .feature-card { background: var(--bg-tertiary); border-color: var(--border-color); }
[data-theme="dark"] .params-table th { background: var(--bg-tertiary); color: var(--text-primary); }
[data-theme="dark"] .params-table td code { background: var(--bg-secondary); color: #93c5fd; }
[data-theme="dark"] .translate-widget {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
}
[data-theme="dark"] .goog-te-gadget-simple {
    background: var(--bg-secondary) !important;
    border-color: var(--border-color) !important;
}
[data-theme="dark"] .goog-te-menu-value span,
[data-theme="dark"] .goog-te-gadget-simple span,
[data-theme="dark"] .goog-te-gadget-simple a {
    color: var(--text-primary) !important;
    filter: invert(0) !important;
}
[data-theme="dark"] .goog-te-gadget-icon {
    filter: invert(1) brightness(2);
}

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

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

/* Google Translate Widget */
.translate-widget {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1000;
    background: var(--bg-primary);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    padding: 8px 12px;
}

#google_translate_element {
    display: inline-block;
}

/* Hide Google Translate banner */
.goog-te-banner-frame.skiptranslate {
    display: none !important;
}

body {
    top: 0 !important;
}

/* Style Google Translate select */
.goog-te-gadget {
    font-family: 'Inter', sans-serif !important;
    font-size: 14px !important;
    color: var(--text-primary) !important;
}

.goog-te-gadget-simple {
    background-color: transparent !important;
    border: none !important;
    padding: 0 !important;
    font-size: 14px !important;
}

.goog-te-gadget-icon {
    display: none !important;
}

.goog-te-menu-value span {
    color: var(--text-primary) !important;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: 30px 0;
    z-index: 100;
}

.logo {
    padding: 0 30px 30px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.logo h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 5px;
}

.logo p {
    font-size: 14px;
    color: var(--text-secondary);
}

.nav-menu {
    padding: 0 15px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 15px;
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: 8px;
    margin-bottom: 4px;
    transition: all 0.2s;
    font-size: 14px;
    font-weight: 500;
}

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

.nav-item.active {
    background: var(--primary-color);
    color: white;
}

/* Theme toggle */
.theme-toggle {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 10px;
}
.theme-toggle-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 4px 12px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    font-family: inherit;
    transition: all 0.2s;
    white-space: nowrap;
}
.theme-toggle-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}
.theme-icon { font-size: 15px; }

/* Docs switcher */
.docs-switcher {
    margin-top: 8px;
    display: flex;
    align-items: center;
    gap: 4px;
    flex-wrap: wrap;
}

.docs-switch {
    font-size: 12px;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 2px 6px;
    border-radius: 4px;
    transition: all 0.2s;
}

.docs-switch:hover {
    color: var(--primary-color);
    background: var(--bg-tertiary);
    text-decoration: none;
}

.docs-switch.active {
    color: var(--primary-color);
    font-weight: 600;
}

.docs-switch-sep { color: var(--text-tertiary); font-size: 12px; }

/* Nav hierarchy */
.nav-h1 {
    font-size: 13px;
    font-weight: 700;
    color: var(--text-primary);
    padding: 11px 15px 9px;
    margin-top: 4px;
    border-radius: 8px;
    border-top: 1px solid var(--border-color);
}

.nav-h1:first-child {
    border-top: none;
    margin-top: 0;
}

.nav-h1.active {
    background: var(--primary-color);
    color: white;
    border-top-color: transparent;
}

.nav-h2 {
    padding: 8px 12px 8px 26px;
    font-size: 13px;
    font-weight: 400;
}

.nav-h3 {
    padding-left: 38px;
    font-size: 12px;
    font-weight: 400;
}

.nav-h4 {
    padding-left: 50px;
    font-size: 12px;
    font-weight: 400;
    color: var(--text-tertiary);
}

.view-all-btn {
    margin: 20px 15px 0;
    width: calc(100% - 30px);
    padding: 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 14px;
}

.view-all-btn:hover {
    background: var(--bg-secondary);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Main Content */
.content {
    margin-left: var(--sidebar-width);
    padding: 40px 60px 80px;
    max-width: 1200px;
}

.step-container {
    background: var(--bg-primary);
    border-radius: 12px;
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

.step {
    display: none;
    animation: fadeIn 0.4s ease-in-out;
}

.step.active {
    display: block;
}

.step.view-all-mode {
    display: block;
    margin-bottom: 40px;
    border-bottom: 2px solid var(--border-color);
}

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

.step-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 40px 50px;
}

.step-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 15px;
}

.step-header h1 {
    font-size: 32px;
    font-weight: 700;
    margin: 0;
}

.step-content {
    padding: 50px;
}

/* Typography */
.lead {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 30px;
    line-height: 1.7;
}

.small-note {
    font-size: 14px;
    color: var(--text-tertiary);
    font-style: italic;
    margin-top: 8px;
    display: block;
}

h3 {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 30px 0 15px;
}

h4 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 20px 0 10px;
}

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

/* Video Container */
.video-container {
    margin: 30px 0;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    background: #000;
}

.video-container video {
    width: 100%;
    height: auto;
    display: block;
}

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

.feature-card {
    background: var(--bg-secondary);
    padding: 25px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 32px;
    margin-bottom: 15px;
}

.feature-card h3 {
    font-size: 18px;
    margin: 0 0 10px;
}

.feature-card p {
    font-size: 14px;
    margin: 0;
    color: var(--text-secondary);
}

/* Instruction Steps */
.instruction-step {
    background: var(--bg-secondary);
    border-left: 4px solid var(--primary-color);
    padding: 25px;
    border-radius: 8px;
    margin: 25px 0;
}

.substep {
    background: white;
    border-left: 3px solid var(--secondary-color);
    padding: 20px;
    border-radius: 6px;
    margin: 15px 0;
}

/* Code Blocks */
.code-block {
    background: #1e293b;
    color: #e2e8f0;
    padding: 20px;
    border-radius: 8px;
    margin: 15px 0;
    overflow-x: auto;
    font-family: 'Monaco', 'Menlo', 'Courier New', monospace;
    font-size: 14px;
    line-height: 1.6;
    position: relative;
}

.code-block code {
    display: block;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Info Boxes */
.info-box {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-left: 4px solid var(--primary-color);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.info-box h4 {
    color: var(--primary-color);
    margin-top: 0;
}

.success-box {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    border-left: 4px solid var(--success-color);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.success-box h4 {
    color: var(--success-color);
    margin-top: 0;
}

.warning-box {
    background: #fffbeb;
    border: 1px solid #fed7aa;
    border-left: 4px solid var(--warning-color);
    padding: 20px;
    border-radius: 8px;
    margin: 20px 0;
}

.warning-box h4 {
    color: var(--warning-color);
    margin-top: 0;
}

/* Tables */
.params-table {
    margin: 20px 0;
    overflow-x: auto;
}

.params-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.params-table th {
    background: var(--bg-tertiary);
    padding: 12px 15px;
    text-align: left;
    font-weight: 600;
    font-size: 14px;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.params-table td {
    padding: 12px 15px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
}

.params-table tr:last-child td {
    border-bottom: none;
}

.params-table tr:hover {
    background: var(--bg-secondary);
}

.params-table code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    color: var(--primary-color);
}

/* Params Section */
.params-section {
    margin: 40px 0;
}

.params-section > h3 {
    font-size: 22px;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--border-color);
}

/* Plain tables generated from markdown */
.step-content table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-primary);
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--border-color);
    margin: 20px 0;
    font-size: 14px;
}

.step-content th {
    background: var(--bg-tertiary);
    padding: 10px 14px;
    text-align: left;
    font-weight: 600;
    color: var(--text-primary);
    border-bottom: 2px solid var(--border-color);
}

.step-content td {
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-secondary);
    vertical-align: top;
}

.step-content tr:last-child td { border-bottom: none; }
.step-content tr:hover { background: var(--bg-secondary); }

.step-content td code, .step-content th code {
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 13px;
    color: var(--primary-color);
}

/* details/summary generated from markdown */
.step-content details {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0;
    margin: 20px 0;
    overflow: hidden;
}

.step-content summary {
    padding: 14px 20px;
    cursor: pointer;
    font-weight: 600;
    color: var(--text-primary);
    background: var(--bg-tertiary);
    list-style: none;
    user-select: none;
}

.step-content summary:hover { background: var(--border-color); }

.step-content details[open] > summary {
    border-bottom: 1px solid var(--border-color);
}

.step-content details > *:not(summary) {
    padding: 16px 20px 4px;
}

/* Blockquotes */
.step-content blockquote {
    border-left: 4px solid var(--border-color);
    margin: 16px 0;
    padding: 10px 16px;
    background: var(--bg-secondary);
    border-radius: 0 6px 6px 0;
    color: var(--text-secondary);
    font-style: italic;
}

.step-content blockquote p {
    margin: 4px 0;
}

/* Lists */
ul, ol {
    padding-left: 25px;
    margin: 15px 0;
}

li {
    margin: 8px 0;
    color: var(--text-secondary);
}

/* Responsive images: all imgs get fluid sizing; badges stay inline */
.step-content img {
    max-width: 100%;
    height: auto;
}

/* Standalone content images (e.g. diagrams, screenshots) are block */
.step-content img.img-block {
    display: block;
    margin: 12px auto;
    border-radius: 6px;
}

/* Hamburger button (hidden on desktop) */
.hamburger {
    display: none;
    position: fixed;
    top: 14px;
    left: 14px;
    z-index: 200;
    background: var(--primary-color);
    border: none;
    border-radius: 8px;
    padding: 10px 11px;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
}
.hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: all 0.25s;
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Sidebar overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    z-index: 99;
}
.sidebar-overlay.visible { display: block; }

/* Links */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: all 0.2s;
}

a:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

/* Navigation Buttons */
.nav-buttons {
    display: flex;
    justify-content: space-between;
    margin-top: 40px;
    padding: 0 50px 50px;
}

.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 15px;
    cursor: pointer;
    transition: all 0.2s;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    border-color: var(--secondary-color);
}

#nextBtn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Footer */
.footer {
    margin-top: 60px;
    padding: 30px 50px;
    background: var(--bg-tertiary);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content p {
    margin: 8px 0;
    font-size: 14px;
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .sidebar {
        width: 250px;
    }
    
    .content {
        margin-left: 250px;
        padding: 30px 40px;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s;
        width: 280px;
    }
    
    .sidebar.mobile-open {
        transform: translateX(0);
    }
    
    .content {
        margin-left: 0;
        padding: 20px;
        padding-top: 60px; /* room for hamburger */
    }
    
    .step-header {
        padding: 30px 25px;
    }
    
    .step-header h1 {
        font-size: 24px;
    }
    
    .step-content {
        padding: 30px 25px;
    }
    
    .nav-buttons {
        padding: 0 25px 30px;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .translate-widget {
        top: 10px;
        right: 10px;
        font-size: 12px;
    }
}

/* Scrollbar Styling */
.sidebar::-webkit-scrollbar {
    width: 6px;
}

.sidebar::-webkit-scrollbar-track {
    background: transparent;
}

.sidebar::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.sidebar::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Print Styles */
@media print {
    .sidebar, .nav-buttons, .translate-widget, .footer {
        display: none;
    }
    
    .content {
        margin-left: 0;
    }
    
    .step {
        display: block !important;
        page-break-after: always;
    }
}