/* completengine.com - Documentation Clean Slate */
/* Palette: #ffffff #f8fafc #e2e8f0 #2563eb #1e293b #64748b #16a34a #dbeafe #d97706 */

:root {
    --white: #ffffff;
    --sidebar-bg: #f8fafc;
    --border: #e2e8f0;
    --blue: #2563eb;
    --code-bg: #1e293b;
    --code-text: #e2e8f0;
    --text: #1e293b;
    --text-sec: #64748b;
    --green: #16a34a;
    --highlight: #dbeafe;
    --amber: #d97706;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--white);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-weight: 400;
    font-size: 16px;
    line-height: 1.75;
}

/* ======================== Header ======================== */
.doc-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 56px;
    background: var(--white);
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
    z-index: 100;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.header-left {
    display: flex;
    align-items: center;
    min-width: 260px;
}

.header-brand {
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--text);
    letter-spacing: -0.01em;
}

.header-center {
    flex: 1;
    display: flex;
    justify-content: center;
    max-width: 480px;
}

.header-search {
    position: relative;
    width: 100%;
    max-width: 360px;
}

.search-icon {
    position: absolute;
    left: 0.65rem;
    top: 50%;
    transform: translateY(-50%);
    width: 15px;
    height: 15px;
    color: var(--text-sec);
    pointer-events: none;
}

.search-input {
    width: 100%;
    padding: 0.4rem 3.5rem 0.4rem 2rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    color: var(--text);
    background: var(--sidebar-bg);
    outline: none;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.search-input:focus {
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.search-input.pulse {
    border-color: var(--blue);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.search-shortcut {
    position: absolute;
    right: 0.5rem;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.65rem;
    font-family: 'Inter', sans-serif;
    color: var(--text-sec);
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 0.1rem 0.35rem;
    pointer-events: none;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    min-width: 180px;
    justify-content: flex-end;
}

.version-select {
    font-family: 'Inter', sans-serif;
    font-size: 0.75rem;
    color: var(--text-sec);
    background: var(--sidebar-bg);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
    border: 1px solid var(--border);
    cursor: pointer;
    outline: none;
}

/* ======================== Progress Bar ======================== */
.progress-bar {
    position: fixed;
    top: 56px;
    left: 0;
    height: 3px;
    background: var(--blue);
    z-index: 101;
    width: 0;
    transition: width 0.15s linear;
    border-radius: 0 2px 2px 0;
}

/* ======================== Sidebar ======================== */
.sidebar {
    position: fixed;
    left: 0;
    top: 56px;
    width: 260px;
    height: calc(100vh - 56px);
    background: var(--sidebar-bg);
    border-right: 1px solid var(--border);
    overflow-y: auto;
    padding: 1.25rem 0;
    z-index: 50;
}

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

.nav-item {
    font-size: 0.85rem;
    padding: 0.4rem 1.25rem;
    color: var(--text-sec);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: background 0.15s, opacity 0.3s, transform 0.3s;
    border-left: 4px solid transparent;
    user-select: none;
    opacity: 0;
    transform: translateX(-8px);
}

.nav-item.visible {
    opacity: 1;
    transform: translateX(0);
}

.nav-item:hover {
    background: rgba(0,0,0,0.03);
}

.nav-top {
    font-weight: 600;
    color: var(--text);
}

.nav-sub {
    padding-left: 2.5rem;
}

.nav-item.active {
    color: var(--blue);
    border-left-color: var(--blue);
    background: rgba(37, 99, 235, 0.04);
}

.nav-check {
    font-size: 0.8rem;
    flex-shrink: 0;
    width: 1rem;
    text-align: center;
    transition: color 0.3s;
}

.nav-check.done {
    color: var(--green);
}

.nav-label {
    flex: 1;
}

/* ======================== On-This-Page TOC ======================== */
.page-toc {
    position: fixed;
    right: 1.5rem;
    top: 84px;
    width: 180px;
    z-index: 50;
}

.toc-title {
    font-weight: 600;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--text-sec);
    margin-bottom: 0.75rem;
}

.toc-link {
    display: block;
    font-size: 0.8rem;
    color: var(--text-sec);
    text-decoration: none;
    padding: 0.25rem 0 0.25rem 0.75rem;
    border-left: 2px solid var(--border);
    margin-bottom: 0.15rem;
    transition: color 0.2s, border-color 0.2s, font-weight 0.2s;
}

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

.toc-link.active {
    color: var(--blue);
    font-weight: 500;
    border-left-color: var(--blue);
}

/* ======================== Content ======================== */
.doc-content {
    margin-left: 260px;
    margin-right: 220px;
    max-width: 720px;
    padding: 80px 40px 60px;
}

.breadcrumb {
    font-size: 0.8rem;
    color: var(--text-sec);
    margin-bottom: 0.5rem;
}

.page-title {
    font-weight: 700;
    font-size: 2rem;
    color: var(--text);
    margin-bottom: 0.25rem;
    position: relative;
    display: inline-block;
}

.last-updated {
    font-size: 0.75rem;
    color: var(--text-sec);
    margin-bottom: 2rem;
}

.section-heading {
    font-weight: 600;
    font-size: 1.4rem;
    color: var(--text);
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
    margin: 2.5rem 0 1rem;
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.subsection-heading {
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--text);
    margin: 2rem 0 0.75rem;
}

.body-text {
    margin-bottom: 1rem;
    color: var(--text);
}

/* Heading Anchors */
.heading-anchor {
    color: var(--text-sec);
    text-decoration: none;
    font-size: 0.85em;
    opacity: 0;
    transition: opacity 0.2s;
    margin-left: 0.25rem;
}

.section-heading:hover .heading-anchor,
.page-title:hover .heading-anchor {
    opacity: 0.5;
}

.heading-anchor:hover {
    opacity: 1 !important;
    color: var(--blue);
}

/* ======================== Code Blocks ======================== */
.code-block {
    background: var(--code-bg);
    border-radius: 8px;
    padding: 1rem 1rem 1rem 1rem;
    margin: 1.25rem 0;
    position: relative;
    overflow-x: auto;
}

.code-lang {
    position: absolute;
    top: 0.55rem;
    right: 4rem;
    font-size: 0.65rem;
    color: rgba(226, 232, 240, 0.4);
    text-transform: uppercase;
    font-family: 'Inter', sans-serif;
    letter-spacing: 0.04em;
}

.copy-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.75rem;
    font-family: 'Inter', sans-serif;
    font-size: 0.65rem;
    color: rgba(226, 232, 240, 0.5);
    background: none;
    border: 1px solid rgba(226, 232, 240, 0.2);
    border-radius: 4px;
    padding: 0.2rem 0.5rem;
    cursor: pointer;
    transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.copy-btn:hover {
    color: rgba(226, 232, 240, 0.8);
    border-color: rgba(226, 232, 240, 0.4);
    background: rgba(226, 232, 240, 0.08);
}

.copy-btn.copied {
    color: var(--green);
    border-color: var(--green);
}

.code-pre {
    font-family: 'Fira Code', monospace;
    font-size: 0.85rem;
    color: var(--code-text);
    line-height: 1.7;
    margin: 0;
    white-space: pre;
}

/* Syntax colors */
.kw { color: #c792ea; }
.str { color: #c3e88d; }
.fn { color: #82aaff; }
.num { color: #f78c6c; }
.cm { color: #546e7a; font-style: italic; }

.inline-code {
    font-family: 'Fira Code', monospace;
    font-size: 0.85em;
    background: var(--highlight);
    padding: 0.1em 0.35em;
    border-radius: 3px;
    color: var(--blue);
}

/* ======================== Callouts ======================== */
.callout {
    display: flex;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    border-radius: 8px;
    margin: 1.25rem 0;
    border-left: 4px solid;
    align-items: flex-start;
}

.callout-info {
    border-color: var(--blue);
    background: rgba(37, 99, 235, 0.04);
}

.callout-warn {
    border-color: var(--amber);
    background: rgba(217, 119, 6, 0.04);
}

.callout-tip {
    border-color: var(--green);
    background: rgba(22, 163, 74, 0.04);
}

.callout-icon {
    font-size: 1.1rem;
    flex-shrink: 0;
    line-height: 1.6;
}

.callout-info .callout-icon { color: var(--blue); }
.callout-warn .callout-icon { color: var(--amber); }
.callout-tip .callout-icon { color: var(--green); }

.callout-text {
    font-size: 0.9rem;
    color: var(--text);
    margin: 0;
    line-height: 1.6;
}

/* ======================== Tables ======================== */
.doc-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.25rem 0;
    font-size: 0.9rem;
}

.doc-table th {
    text-align: left;
    font-weight: 600;
    padding: 0.6rem 0.75rem;
    border-bottom: 2px solid var(--border);
    font-size: 0.85rem;
    color: var(--text);
}

.doc-table td {
    padding: 0.5rem 0.75rem;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.doc-table tbody tr:nth-child(even) {
    background: var(--sidebar-bg);
}

.doc-table tbody tr:hover {
    background: rgba(37, 99, 235, 0.02);
}

.mono {
    font-family: 'Fira Code', monospace;
    font-size: 0.8rem;
}

/* ======================== Feedback ======================== */
.feedback-block {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin: 3rem 0 2rem;
    padding: 1.25rem 0;
    border-top: 1px solid var(--border);
}

.feedback-text {
    font-size: 0.9rem;
    color: var(--text-sec);
}

.feedback-btns {
    display: flex;
    gap: 0.5rem;
}

.fb-btn {
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    padding: 0.35rem 0.85rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    background: var(--white);
    color: var(--text-sec);
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s, background 0.2s;
}

.fb-btn:hover {
    border-color: var(--blue);
    color: var(--blue);
}

.fb-btn.selected {
    background: var(--blue);
    color: var(--white);
    border-color: var(--blue);
}

.feedback-thanks {
    font-size: 0.8rem;
    color: var(--green);
    opacity: 0;
    transition: opacity 0.3s;
}

.feedback-thanks.show {
    opacity: 1;
}

/* ======================== Next Page ======================== */
.next-page {
    display: flex;
    flex-direction: column;
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    margin-bottom: 3rem;
    text-decoration: none;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.next-page:hover {
    border-color: var(--blue);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.08);
}

.next-label {
    font-size: 0.75rem;
    color: var(--text-sec);
    margin-bottom: 0.25rem;
}

.next-title {
    font-weight: 600;
    color: var(--blue);
    font-size: 0.95rem;
}

.next-arrow {
    display: inline-block;
    transition: transform 0.2s;
}

.next-page:hover .next-arrow {
    transform: translateX(4px);
}

/* ======================== Footer ======================== */
.doc-footer {
    padding: 2rem 0;
    border-top: 1px solid var(--border);
}

.footer-text {
    font-size: 0.75rem;
    color: var(--text-sec);
}

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

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

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

/* ======================== Responsive ======================== */
@media (max-width: 1100px) {
    .page-toc { display: none; }
    .doc-content { margin-right: 0; }
}

@media (max-width: 768px) {
    .sidebar { display: none; }
    .doc-content {
        margin-left: 0;
        padding: 80px 1.5rem 40px;
    }
    .header-left { min-width: auto; }
    .header-center { max-width: 200px; }
    .search-shortcut { display: none; }
}