/* Documentation Page Stylesheet - Zero Forwarder */
/* Light Theme */

:root {
    /* Color Variables - Light Theme */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc; /* Slate 50 */
    --bg-tertiary: #f1f5f9;  /* Slate 100 */
    --bg-backdrop: rgba(255, 255, 255, 0.9);

    --accent-primary: #0ea5e9;   /* Sky 500 */
    --accent-secondary: #06b6d4; /* Cyan 500 */
    --accent-hover: #0284c7;     /* Sky 600 */

    --text-primary: #1e293b;   /* Slate 800 */
    --text-secondary: #64748b; /* Slate 500 */
    --text-muted: #94a3b8;     /* Slate 400 */
    --text-inverted: #ffffff;

    --border-color: #e2e8f0;   /* Slate 200 */
    --border-hover: #cbd5e1;   /* Slate 300 */

    /* Shadow Levels */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-primary: 0 4px 14px rgba(14, 165, 233, 0.25);
    --shadow-glow: 0 0 20px rgba(14, 165, 233, 0.35);

    /* Font Variables */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Layout */
    --navbar-height: 4rem;
    --sidebar-width: 260px;
    --toc-width: 220px;
}

/* ============================================================
   RESET & BASE
   ============================================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
}

/* ============================================================
   NAVBAR
   ============================================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    background: var(--bg-backdrop);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-lg);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: var(--text-primary);
}

.logo-icon {
    width: 2rem;
    height: 2rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    color: white;
}

.brand-name {
    font-size: 1.25rem;
    font-weight: 600;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--accent-primary);
    border-radius: 1px;
}

.cta-btn {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    padding: var(--space-sm) var(--space-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-primary);
}

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

/* Hamburger Menu */
.hamburger-menu {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 24px;
    height: 18px;
    background: transparent;
    border: none;
    cursor: pointer;
    z-index: 1002;
    padding: 0;
}

.hamburger-menu .bar {
    width: 100%;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}

/* ============================================================
   DOCS LAYOUT CONTAINER
   ============================================================ */

.docs-container {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr var(--toc-width);
    gap: 0;
    min-height: calc(100vh - var(--navbar-height));
    padding-top: var(--navbar-height);
}

/* ============================================================
   SIDEBAR
   ============================================================ */

.docs-sidebar {
    background: var(--bg-secondary);
    border-right: 1px solid var(--border-color);
    position: sticky;
    top: var(--navbar-height);
    height: calc(100vh - var(--navbar-height));
    overflow-y: auto;
    padding: 1.5rem;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.docs-sidebar::-webkit-scrollbar {
    width: 6px;
}

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

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

/* Sidebar Header with Search */
.sidebar-header {
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--space-lg);
}

.sidebar-header h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.search-container {
    position: relative;
}

.search-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: var(--font-primary);
    transition: all 0.3s ease;
}

.search-input:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

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

/* Sidebar Navigation */
.sidebar-nav {
    padding: 0;
}

.nav-list {
    list-style: none;
}

.nav-category {
    margin-bottom: var(--space-lg);
}

.nav-category-title {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-muted);
    padding: var(--space-xs) var(--space-sm);
    margin-bottom: var(--space-xs);
}

.nav-item {
    margin-bottom: 2px;
}

.nav-link-item {
    display: block;
    padding: var(--space-sm) var(--space-md);
    color: var(--text-secondary);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    font-size: 0.9rem;
    position: relative;
    line-height: 1.4;
}

.nav-link-item:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    transform: translateX(2px);
}

.nav-link-item.active {
    background: rgba(14, 165, 233, 0.1);
    color: var(--accent-primary);
    border-left: 3px solid var(--accent-primary);
    padding-left: calc(var(--space-md) - 3px);
    font-weight: 500;
}

/* No search results */
.no-results {
    padding: var(--space-xl) var(--space-md);
    text-align: center;
    color: var(--text-muted);
    list-style: none;
}

.no-results-content {
    background: var(--bg-tertiary);
    padding: var(--space-lg);
    border-radius: var(--radius-md);
    border: 1px dashed var(--border-color);
    font-size: 0.9rem;
}

.nav-item,
.nav-category {
    transition: opacity 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-5px); }
    to   { opacity: 1; transform: translateY(0); }
}

.nav-item[style*="display: block"],
.nav-category[style*="display: block"] {
    animation: fadeIn 0.3s ease forwards;
}

/* ============================================================
   MAIN CONTENT
   ============================================================ */

.docs-main {
    display: flex;
    flex-direction: column;
    background: var(--bg-primary);
    position: relative;
    min-width: 0;
}

.docs-content {
    flex: 1;
    padding: var(--space-2xl);
    max-width: none;
    scroll-margin-top: 80px;
}

/* Mobile Reader Toolbar (hidden on desktop) */
.mobile-reader-toolbar {
    display: none;
}

/* ============================================================
   MARKDOWN BODY
   ============================================================ */

.markdown-body {
    max-width: 800px;
    line-height: 1.75;
    color: var(--text-primary);
}

/* Headings */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4,
.markdown-body h5,
.markdown-body h6 {
    color: var(--text-primary);
    font-weight: 600;
    margin-top: var(--space-2xl);
    margin-bottom: var(--space-lg);
    scroll-margin-top: calc(var(--navbar-height) + 1.5rem);
    line-height: 1.3;
}

.markdown-body h1 {
    font-size: 2.5rem;
    border-bottom: 2px solid var(--accent-primary);
    padding-bottom: var(--space-md);
    margin-top: 0;
}

.markdown-body h2 {
    font-size: 2rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: var(--space-sm);
}

.markdown-body h3 {
    font-size: 1.5rem;
}

.markdown-body h4 {
    font-size: 1.25rem;
}

.markdown-body h5 {
    font-size: 1.125rem;
}

.markdown-body h6 {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Paragraphs */
.markdown-body p {
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

/* Lists */
.markdown-body ul,
.markdown-body ol {
    margin-bottom: var(--space-lg);
    padding-left: var(--space-xl);
}

.markdown-body li {
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.markdown-body li strong {
    color: var(--text-primary);
    font-weight: 700;
}

/* Inline Code */
.markdown-body code {
    background: var(--bg-tertiary);
    color: #0987a0;
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    border: 1px solid var(--border-color);
}

/* Code Blocks */
.markdown-body pre {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    position: relative;
}

.markdown-body pre code {
    background: none;
    color: var(--text-primary);
    padding: 0;
    border: none;
    font-size: 0.875rem;
    line-height: 1.5;
    font-family: var(--font-mono);
}

/* Blockquote */
.markdown-body blockquote {
    border-left: 4px solid var(--accent-primary);
    background: var(--bg-secondary);
    padding: var(--space-lg);
    margin: var(--space-lg) 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.markdown-body blockquote p {
    margin: 0;
    color: var(--text-secondary);
    font-style: italic;
}

/* Tables */
.markdown-body table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-lg) 0;
    background: white;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.markdown-body th,
.markdown-body td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.markdown-body th {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    font-weight: 600;
}

.markdown-body td {
    color: var(--text-primary);
}

.markdown-body tr:last-child td {
    border-bottom: none;
}

/* Images */
.markdown-body img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: var(--space-lg) 0;
}

/* Links */
.markdown-body a {
    color: var(--accent-primary);
    text-decoration: none;
    border-bottom: 1px solid transparent;
    transition: all 0.3s ease;
}

.markdown-body a:hover {
    border-bottom-color: var(--accent-primary);
}

/* Horizontal Rule */
.markdown-body hr {
    border: none;
    border-top: 1px solid var(--border-color);
    margin: var(--space-2xl) 0;
}

/* ============================================================
   TABLE OF CONTENTS (TOC)
   ============================================================ */

.docs-toc {
    background: white;
    border-left: 1px solid var(--border-color);
    position: sticky;
    top: var(--navbar-height);
    height: calc(100vh - var(--navbar-height));
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--border-color) transparent;
}

.docs-toc::-webkit-scrollbar {
    width: 6px;
}

.docs-toc::-webkit-scrollbar-track {
    background: transparent;
}

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

.toc-header {
    padding: var(--space-xl) var(--space-lg) var(--space-lg);
    border-bottom: 1px solid var(--border-color);
}

.toc-header h4 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.toc-nav {
    padding: var(--space-lg);
}

.toc-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.toc-nav li {
    margin-bottom: var(--space-xs);
}

.toc-nav a {
    display: block;
    padding: var(--space-xs) var(--space-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    border-left: 2px solid transparent;
    line-height: 1.4;
}

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

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

/* TOC heading depth indentation */
.toc-nav .toc-h1 {
    padding-left: var(--space-sm);
}

.toc-nav .toc-h2 {
    padding-left: var(--space-sm);
}

.toc-nav .toc-h3 {
    padding-left: var(--space-lg);
}

.toc-nav .toc-h4 {
    padding-left: var(--space-xl);
}

/* ============================================================
   LOADING STATE
   ============================================================ */

.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-2xl);
    min-height: 200px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top: 3px solid var(--accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: var(--space-lg);
}

@keyframes spin {
    0%   { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* ============================================================
   ERROR STATE
   ============================================================ */

.error-message {
    text-align: center;
    padding: var(--space-2xl);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid #dc2626;
    margin: var(--space-lg) 0;
}

.error-message h3 {
    color: #dc2626;
    margin-bottom: var(--space-md);
}

.error-message p {
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
}

/* ============================================================
   SIDEBAR TOGGLE (visible on tablet, hidden on mobile/desktop)
   ============================================================ */

.sidebar-toggle {
    display: none;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-weight: 500;
    cursor: pointer;
    margin: var(--space-lg) var(--space-lg) 0;
    width: fit-content;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: calc(var(--navbar-height) + var(--space-md));
    z-index: 90;
}

.sidebar-toggle svg {
    width: 20px;
    height: 20px;
}

/* Backdrop for mobile panels */
.mobile-panel-backdrop {
    display: none;
}

/* Mobile doc pagination */
.mobile-doc-pagination {
    display: none;
}

/* ============================================================
   RESPONSIVE: TABLET (< 1200px) — hide TOC column
   ============================================================ */

@media (max-width: 1200px) {
    .docs-container {
        grid-template-columns: var(--sidebar-width) 1fr;
    }

    .docs-toc {
        display: none;
    }
}

/* ============================================================
   RESPONSIVE: MOBILE (< 1024px)
   ============================================================ */

@media (max-width: 1024px) {
    .docs-container {
        display: block;
        padding-top: var(--navbar-height);
    }

    .docs-sidebar {
        position: fixed;
        top: var(--navbar-height);
        left: -100%;
        width: 80%;
        max-width: 300px;
        height: calc(100vh - var(--navbar-height));
        z-index: 999;
        transition: left 0.3s ease;
        background: var(--bg-primary);
        box-shadow: var(--shadow-lg);
        padding: var(--space-lg);
    }

    .docs-sidebar.open {
        left: 0;
    }

    .docs-toc {
        display: block;
        position: fixed;
        top: var(--navbar-height);
        right: -100%;
        width: 80%;
        max-width: 280px;
        height: calc(100vh - var(--navbar-height));
        z-index: 999;
        transition: right 0.3s ease;
        box-shadow: var(--shadow-lg);
    }

    .docs-toc.open {
        right: 0;
    }

    /* Backdrop shown when sidebar or TOC is open */
    .mobile-panel-backdrop {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        width: 100vw;
        height: calc(100vh - var(--navbar-height));
        background: rgba(15, 23, 42, 0.22);
        z-index: 998;
    }

    .mobile-panel-backdrop.active {
        display: block;
    }

    /* Mobile reader toolbar — visible on mobile */
    .mobile-reader-toolbar {
        display: grid;
        grid-template-columns: auto auto 1fr;
        gap: var(--space-sm);
        position: sticky;
        top: calc(var(--navbar-height) + var(--space-sm));
        margin: var(--space-md) var(--space-md) 0;
        width: calc(100% - (var(--space-md) * 2));
        padding: var(--space-sm);
        border: 1px solid var(--border-color);
        border-radius: var(--radius-lg);
        background: rgba(255, 255, 255, 0.96);
        backdrop-filter: blur(8px);
        box-shadow: var(--shadow-sm);
        z-index: 80;
    }

    .mobile-toolbar-btn {
        border: 1px solid var(--border-color);
        background: var(--bg-secondary);
        color: var(--text-primary);
        border-radius: var(--radius-md);
        padding: 0.45rem 0.65rem;
        font-size: 0.82rem;
        font-weight: 600;
        white-space: nowrap;
        cursor: pointer;
        font-family: var(--font-primary);
        transition: background 0.2s ease;
    }

    .mobile-toolbar-btn:hover {
        background: var(--bg-tertiary);
    }

    .mobile-current-doc {
        min-width: 0;
        align-self: center;
        font-size: 0.82rem;
        color: var(--text-secondary);
        overflow: hidden;
        text-overflow: ellipsis;
        white-space: nowrap;
    }

    /* Mobile nav menu */
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--space-xl);
        transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1001;
        box-shadow: -5px 0 15px rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        right: 0;
    }

    .hamburger-menu {
        display: flex;
    }

    .hamburger-menu.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }
    .hamburger-menu.active .bar:nth-child(2) {
        opacity: 0;
    }
    .hamburger-menu.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    .nav-link {
        font-size: 1.5rem;
    }

    .docs-content {
        padding: var(--space-lg) var(--space-md) calc(var(--space-2xl) + 1rem);
    }

    /* Ensure code blocks scroll horizontally on mobile */
    .markdown-body pre {
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        max-width: 100%;
    }

    .markdown-body h1 {
        font-size: 2rem;
    }

    .markdown-body h2 {
        font-size: 1.5rem;
    }

    /* Mobile doc pagination (prev/next links) */
    .mobile-doc-pagination {
        display: grid;
        grid-template-columns: 1fr auto 1fr;
        gap: var(--space-sm);
        margin-top: var(--space-2xl);
        border-top: 1px solid var(--border-color);
        padding-top: var(--space-lg);
    }

    .mobile-page-link {
        display: flex;
        flex-direction: column;
        gap: 2px;
        text-decoration: none;
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        background: var(--bg-secondary);
        padding: 0.65rem 0.75rem;
        min-height: 62px;
        justify-content: center;
        transition: background 0.2s ease;
    }

    .mobile-page-link:hover {
        background: var(--bg-tertiary);
    }

    .mobile-page-link.prev {
        align-items: flex-start;
        text-align: left;
    }

    .mobile-page-link.next {
        align-items: flex-end;
        text-align: right;
    }

    .mobile-page-link .label {
        font-size: 0.72rem;
        color: var(--text-muted);
    }

    .mobile-page-link .title {
        font-size: 0.82rem;
        color: var(--text-primary);
        font-weight: 600;
        line-height: 1.3;
    }

    .mobile-page-center {
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md);
        background: var(--bg-primary);
        color: var(--text-secondary);
        font-size: 0.76rem;
        font-weight: 600;
        display: flex;
        align-items: center;
        justify-content: center;
        width: 66px;
        min-width: 66px;
        min-height: 62px;
        padding: 0 var(--space-sm);
    }

    .nav-container {
        padding: 0 var(--space-md);
    }
}

/* ============================================================
   RESPONSIVE: SMALL MOBILE (< 480px)
   ============================================================ */

@media (max-width: 480px) {
    .docs-content {
        padding: var(--space-md) var(--space-sm) calc(var(--space-2xl) + 1rem);
    }

    .nav-container {
        padding: 0 var(--space-sm);
    }

    .brand-name {
        display: none;
    }

    .mobile-reader-toolbar {
        margin: var(--space-sm);
        width: calc(100% - (var(--space-sm) * 2));
        grid-template-columns: 1fr 1fr;
    }

    .mobile-current-doc {
        grid-column: 1 / -1;
    }
}

/* ============================================================
   PREFERS-REDUCED-MOTION
   ============================================================ */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }

    html {
        scroll-behavior: auto;
    }

    .spinner {
        animation: none;
        border-top-color: var(--accent-primary);
    }
}