/* ====== RESET & BASE ====== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #3ba68c;
    --primary-dark: #2d8a73;
    --primary-light: #5cc4a8;
    --primary-50: #edf8f4;
    --primary-100: #d4f0e6;
    --primary-200: #a8e1cd;
    --primary-900: #1a4a3d;
    --gray-50: #f8fafb;
    --gray-100: #f1f4f6;
    --gray-200: #e2e8ec;
    --gray-300: #cdd5db;
    --gray-400: #9ba8b3;
    --gray-500: #6b7c8a;
    --gray-600: #4a5c6a;
    --gray-700: #364554;
    --gray-800: #1e2d3a;
    --gray-900: #0f1922;
    --white: #fff;
    --radius: 10px;
    --radius-sm: 6px;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --sidebar-w: 260px;
    --topnav-h: 56px;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 72px;
}

body {
    font-family: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--gray-800);
    background: var(--white);
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

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

a:hover {
    text-decoration: underline;
}

img {
    max-width: 100%;
}

code {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 0.85em;
    background: var(--gray-100);
    border: 1px solid var(--gray-200);
    padding: 1px 6px;
    border-radius: 4px;
    color: var(--primary-dark);
}

/* ====== TOP NAV ====== */
.topnav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--topnav-h);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--gray-200);
    transition: box-shadow 0.2s;
}

.topnav.scrolled {
    box-shadow: var(--shadow);
}

.topnav-inner {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.topnav-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 17px;
    color: var(--gray-900);
    text-decoration: none;
}

.topnav-logo {
    width: 28px;
    height: 28px;
}

.topnav-separator {
    color: var(--gray-300);
    font-weight: 300;
}

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

.topnav-actions {
    display: flex;
    align-items: center;
    gap: 16px;
}

.topnav-link {
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-500);
    text-decoration: none;
}

.topnav-link:hover {
    color: var(--primary);
    text-decoration: none;
}

.sidebar-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.sidebar-toggle span {
    display: block;
    width: 20px;
    height: 2px;
    background: var(--gray-600);
    border-radius: 2px;
    transition: all 0.3s;
}

.sidebar-toggle.open span:nth-child(1) {
    transform: rotate(45deg) translate(4px, 4px);
}

.sidebar-toggle.open span:nth-child(2) {
    opacity: 0;
}

.sidebar-toggle.open span:nth-child(3) {
    transform: rotate(-45deg) translate(4px, -4px);
}

/* ====== DOCS LAYOUT ====== */
.docs-layout {
    display: flex;
    margin-top: var(--topnav-h);
    min-height: calc(100vh - var(--topnav-h));
}

/* ====== SIDEBAR ====== */
.sidebar {
    width: var(--sidebar-w);
    flex-shrink: 0;
    position: sticky;
    top: var(--topnav-h);
    height: calc(100vh - var(--topnav-h));
    overflow-y: auto;
    border-right: 1px solid var(--gray-200);
    background: var(--gray-50);
    padding: 20px 0;
}

.sidebar-inner {
    padding: 0 16px;
}

.sidebar-section {
    margin-bottom: 20px;
}

.sidebar-heading {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--gray-400);
    padding: 0 10px;
    margin-bottom: 6px;
}

.sidebar-link {
    display: block;
    padding: 5px 10px;
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-600);
    border-radius: var(--radius-sm);
    transition: all 0.15s;
    text-decoration: none;
}

.sidebar-link:hover {
    color: var(--primary-dark);
    background: var(--primary-50);
    text-decoration: none;
}

.sidebar-link.active {
    color: var(--primary);
    background: var(--primary-50);
    font-weight: 600;
}

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

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

.sidebar::-webkit-scrollbar-thumb {
    background: var(--gray-300);
    border-radius: 4px;
}

/* ====== MAIN CONTENT ====== */
.content {
    flex: 1;
    min-width: 0;
    max-width: 860px;
    padding: 40px 48px 80px;
}

.content section {
    margin-bottom: 56px;
    padding-bottom: 56px;
    border-bottom: 1px solid var(--gray-100);
}

.content section:last-child {
    border-bottom: none;
}

/* ====== HERO DOC ====== */
.hero-doc {
    text-align: center;
    padding: 32px 0 40px;
}

.hero-doc-logo {
    width: 72px;
    height: 72px;
    margin-bottom: 16px;
}

.hero-doc h1 {
    font-size: 32px;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: 12px;
}

.hero-doc-sub {
    font-size: 17px;
    color: var(--gray-500);
    max-width: 520px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ====== TYPOGRAPHY ====== */
.content h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: 16px;
    padding-top: 8px;
}

.content h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--gray-800);
    margin: 28px 0 12px;
}

.content h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--gray-800);
    margin-bottom: 6px;
}

.content p {
    margin-bottom: 14px;
    color: var(--gray-600);
    font-size: 15px;
}

.content ul,
.content ol {
    margin: 0 0 16px 20px;
    color: var(--gray-600);
    font-size: 15px;
}

.content li {
    margin-bottom: 6px;
}

.content li strong {
    color: var(--gray-800);
}

/* ====== CALLOUTS ====== */
.callout {
    border-radius: var(--radius);
    padding: 16px 20px;
    margin: 20px 0;
    font-size: 14px;
}

.callout p {
    margin-bottom: 0;
    font-size: 14px;
}

.callout-title {
    font-weight: 700;
    font-size: 13px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 6px;
}

.callout-info {
    background: var(--primary-50);
    border: 1px solid var(--primary-100);
    color: var(--primary-900);
}

.callout-info .callout-title {
    color: var(--primary-dark);
}

.callout-tip {
    background: #f0fdf4;
    border: 1px solid #bbf7d0;
    color: #14532d;
}

.callout-tip .callout-title {
    color: #15803d;
}

.callout-warning {
    background: #fffbeb;
    border: 1px solid #fde68a;
    color: #78350f;
}

.callout-warning .callout-title {
    color: #b45309;
}

/* ====== CODE BLOCKS ====== */
.code-block {
    background: var(--gray-900);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin: 16px 0;
    overflow-x: auto;
}

.code-block pre {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 13px;
    line-height: 1.7;
    color: #c9d1d9;
    white-space: pre;
}

.code-inline {
    margin-bottom: 4px;
}

.code-inline code {
    display: inline-block;
    font-size: 12px;
}

/* ====== TABLES ====== */
.ref-table {
    width: 100%;
    border-collapse: collapse;
    margin: 16px 0;
    font-size: 14px;
}

.ref-table thead th {
    text-align: left;
    padding: 10px 14px;
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    font-weight: 700;
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--gray-500);
}

.ref-table tbody td {
    padding: 10px 14px;
    border: 1px solid var(--gray-200);
    color: var(--gray-600);
    vertical-align: top;
}

.ref-table tbody tr:hover {
    background: var(--gray-50);
}

/* ====== BADGES ====== */
.badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
    white-space: nowrap;
}

.badge-blue {
    background: #dbeafe;
    color: #1e40af;
}

.badge-orange {
    background: #ffedd5;
    color: #c2410c;
}

.badge-purple {
    background: #f3e8ff;
    color: #7c3aed;
}

.badge-yellow {
    background: #fef9c3;
    color: #a16207;
}

.badge-indigo {
    background: #e0e7ff;
    color: #4338ca;
}

.badge-slate {
    background: #f1f5f9;
    color: #475569;
}

.badge-green {
    background: #dcfce7;
    color: #16a34a;
}

.badge-teal {
    background: var(--primary-50);
    color: var(--primary-dark);
}

.badge-pink {
    background: #fce7f3;
    color: #be185d;
}

.badge-cyan {
    background: #cffafe;
    color: #0e7490;
}

.badge-red {
    background: #fee2e2;
    color: #dc2626;
}

/* ====== GRIDS ====== */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin: 16px 0;
}

.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin: 16px 0;
}

.info-card {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 20px;
}

.info-card h4 {
    margin-bottom: 8px;
    color: var(--gray-800);
}

.info-card p {
    font-size: 13px;
    color: var(--gray-500);
    margin-bottom: 8px;
}

/* ====== STEPS ====== */
.steps-doc {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 20px 0;
}

.step-doc {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.step-doc-num {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary);
    color: var(--white);
    font-size: 15px;
    font-weight: 800;
    border-radius: 50%;
}

.step-doc-body {
    flex: 1;
    padding-top: 4px;
}

.step-doc-body h4 {
    font-size: 15px;
    color: var(--gray-800);
    margin-bottom: 4px;
}

.step-doc-body p {
    font-size: 14px;
    color: var(--gray-500);
    margin-bottom: 4px;
}

.step-doc-body ul {
    margin: 4px 0 0 16px;
    font-size: 13px;
}

/* ====== SCREENSHOT PLACEHOLDER ====== */
.screenshot-placeholder-doc {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    background: linear-gradient(135deg, var(--primary-50), var(--gray-100));
    border: 2px dashed var(--primary-200);
    border-radius: var(--radius);
    padding: 40px;
    margin: 20px 0;
    min-height: 180px;
}

.screenshot-placeholder-doc p {
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-500);
    margin: 0;
}

.screenshot-placeholder-doc span {
    font-size: 12px;
    color: var(--gray-400);
}

/* ====== DIAGRAMS ====== */
.diagram {
    background: var(--gray-50);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
    padding: 24px;
    margin: 24px 0;
}

.diagram-title {
    text-align: center;
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--gray-400);
    margin-bottom: 20px;
}

.diagram-flow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    flex-wrap: nowrap;
}

.diagram-flow-wrap {
    flex-wrap: wrap;
}

.diagram-arrow {
    font-size: 20px;
    color: var(--gray-300);
    font-weight: 300;
    flex-shrink: 0;
    display: flex;
    align-items: center;
}

.diagram-arrow svg {
    width: 20px;
    height: 20px;
}

.diagram-node {
    text-align: center;
    padding: 16px 14px;
    border-radius: var(--radius);
    min-width: 100px;
    border: 1px solid transparent;
}

.diagram-node-icon {
    font-size: 22px;
    font-weight: 800;
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.diagram-node-icon svg {
    width: 22px;
    height: 22px;
}

.diagram-node-label {
    font-size: 13px;
    font-weight: 700;
    color: var(--gray-800);
}

.diagram-node-desc {
    font-size: 11px;
    color: var(--gray-500);
    margin-top: 2px;
}

.diagram-node-blue {
    background: #dbeafe;
    border-color: #93c5fd;
}

.diagram-node-blue .diagram-node-icon {
    color: #1e40af;
}

.diagram-node-green {
    background: #dcfce7;
    border-color: #86efac;
}

.diagram-node-green .diagram-node-icon {
    color: #16a34a;
}

.diagram-node-teal {
    background: var(--primary-50);
    border-color: var(--primary-200);
}

.diagram-node-teal .diagram-node-icon {
    color: var(--primary-dark);
}

.diagram-node-pink {
    background: #fce7f3;
    border-color: #f9a8d4;
}

.diagram-node-pink .diagram-node-icon {
    color: #be185d;
}

.diagram-node-purple {
    background: #f3e8ff;
    border-color: #d8b4fe;
}

.diagram-node-purple .diagram-node-icon {
    color: #7c3aed;
}

.diagram-node-yellow {
    background: #fef9c3;
    border-color: #fde68a;
}

.diagram-node-yellow .diagram-node-icon {
    color: #a16207;
}

.diagram-node-slate {
    background: #f1f5f9;
    border-color: #cbd5e1;
}

.diagram-node-slate .diagram-node-icon {
    color: #475569;
}

/* Scope diagram */
.diagram-scope {
    padding: 0 8px;
}

.diagram-scope-outer {
    border: 2px solid var(--gray-300);
    border-radius: var(--radius);
    padding: 16px;
    background: var(--white);
}

.diagram-scope-label {
    font-size: 11px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--gray-400);
    margin-bottom: 12px;
}

.diagram-scope-items {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.diagram-scope-item {
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--gray-200);
    background: var(--gray-50);
}

.diagram-scope-active {
    border-color: var(--primary);
    background: var(--primary-50);
    box-shadow: 0 0 0 2px rgba(59, 166, 140, 0.15);
}

.diagram-scope-item-label {
    font-size: 13px;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 4px;
}

.diagram-scope-tag {
    font-size: 11px;
    font-weight: 700;
    color: var(--primary);
    margin-left: 8px;
}

.diagram-scope-children {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding-left: 12px;
    border-left: 2px solid var(--primary-200);
    margin-top: 6px;
}

.diagram-scope-children span {
    font-family: 'IBM Plex Mono', monospace;
    font-size: 12px;
    color: var(--gray-500);
}

/* Block visual grid */
.block-visual-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 10px;
    margin: 20px 0;
}

.block-visual-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
    padding: 14px 8px;
    border-radius: var(--radius);
    border: 1px solid transparent;
    transition: transform 0.15s, box-shadow 0.15s;
}

.block-visual-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.bv-icon {
    font-size: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.bv-icon svg {
    width: 24px;
    height: 24px;
}

.bv-label {
    font-size: 11px;
    font-weight: 700;
    text-align: center;
}

.bv-blue {
    background: #dbeafe;
    border-color: #93c5fd;
    color: #1e40af;
}

.bv-orange {
    background: #ffedd5;
    border-color: #fdba74;
    color: #c2410c;
}

.bv-purple {
    background: #f3e8ff;
    border-color: #d8b4fe;
    color: #7c3aed;
}

.bv-yellow {
    background: #fef9c3;
    border-color: #fde68a;
    color: #a16207;
}

.bv-indigo {
    background: #e0e7ff;
    border-color: #a5b4fc;
    color: #4338ca;
}

.bv-slate {
    background: #f1f5f9;
    border-color: #cbd5e1;
    color: #475569;
}

.bv-green {
    background: #dcfce7;
    border-color: #86efac;
    color: #16a34a;
}

.bv-teal {
    background: var(--primary-50);
    border-color: var(--primary-200);
    color: var(--primary-dark);
}

.bv-pink {
    background: #fce7f3;
    border-color: #f9a8d4;
    color: #be185d;
}

.bv-cyan {
    background: #cffafe;
    border-color: #67e8f9;
    color: #0e7490;
}

/* Larger screenshot placeholder */
.screenshot-placeholder-doc-lg {
    min-height: 240px;
}

/* ====== RESPONSIVE ====== */
@media (max-width: 1024px) {
    .content {
        padding: 32px 32px 64px;
    }
}

@media (max-width: 768px) {
    .sidebar {
        position: fixed;
        left: -100%;
        top: var(--topnav-h);
        width: 280px;
        z-index: 90;
        transition: left 0.3s ease;
        box-shadow: none;
    }

    .sidebar.open {
        left: 0;
        box-shadow: 4px 0 20px rgba(0, 0, 0, 0.1);
    }

    .sidebar-toggle {
        display: flex;
    }

    .content {
        padding: 24px 20px 64px;
    }

    .grid-2 {
        grid-template-columns: 1fr;
    }

    .grid-3 {
        grid-template-columns: 1fr;
    }

    .block-visual-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .diagram-flow {
        flex-wrap: wrap;
    }

    .diagram-node {
        min-width: 80px;
        padding: 12px 10px;
    }

    .hero-doc h1 {
        font-size: 26px;
    }

    .content h2 {
        font-size: 20px;
    }

    .ref-table {
        font-size: 12px;
    }

    .ref-table thead th,
    .ref-table tbody td {
        padding: 8px 10px;
    }
}

@media (max-width: 480px) {
    .topnav-link {
        display: none;
    }

    .content {
        padding: 16px 14px 48px;
    }

    .code-block {
        padding: 14px 16px;
    }

    .code-block pre {
        font-size: 11px;
    }
}