/* ======================================================================
   VipsPM Documentation
   ====================================================================== */

/* -- CSS Variables / Design Tokens
---------------------------------------------------------------------- */
:root {
    /* Colors */
    --color-primary: #00bcd4;
    --color-primary-dark: #0097a7;
    --color-primary-light: #e0f7fa;
    --color-accent: #40e0d0;
    --color-text: #2d3748;
    --color-text-secondary: #64748b;
    --color-text-light: #94a3b8;
    --color-heading: #1a202c;
    --color-bg: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    --color-link: #0891b2;
    --color-link-hover: #0e7490;
    --color-code-bg: #f8fafc;
    --color-sidebar-bg: rgba(15, 23, 42, 0.92);
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;

    /* Typography */
    --font-sans: 'Inter', 'Montserrat', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;

    /* Sizing */
    --sidebar-width: 280px;
    --content-max-width: 900px;
    --border-radius: 10px;
    --border-radius-sm: 6px;
    --border-radius-lg: 16px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 25px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
    --shadow-xl: 0 20px 40px -4px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.25s ease;
    --transition-slow: 0.4s ease;
}


/* -- Reset
---------------------------------------------------------------------- */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    font-family: var(--font-sans);
    -webkit-text-size-adjust: 100%;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: var(--color-text);
    scroll-behavior: smooth;
    scroll-padding-top: 20px;
}

body {
    min-height: 100vh;
    width: 100%;
    position: relative;
    background: var(--color-bg);
    line-height: 1.7;
    overflow-x: hidden;
}

body::before {
    position: fixed;
    top: -40px;
    right: -40px;
    background-image: url("../img/Asset 1.png");
    background-repeat: no-repeat;
    width: 500px;
    height: 200px;
    content: "";
    opacity: 0.05;
    background-size: contain;
    pointer-events: none;
    z-index: 0;
}

footer,
header,
section {
    display: block;
}

a {
    color: var(--color-link);
    text-decoration: none;
    cursor: pointer;
    transition: color var(--transition-fast);
}

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

p,
ul,
ol {
    margin: var(--space-md) 0;
    line-height: 1.7;
}

li {
    list-style: none;
}

li.placeholder {
    height: 70px;
    width: 100%;
    font-size: 16px;
}

hr {
    display: block;
    height: 0;
    border: 0;
    border-top: 1px solid var(--color-border);
    margin: var(--space-xl) 0;
    padding: 0;
    clear: both;
}

hr.notop {
    margin-top: 0;
}

strong {
    font-weight: 600;
}

img {
    border: 0;
    max-width: 100%;
}

.small {
    font-size: 12px;
    letter-spacing: 0;
}


/* -- Layout
---------------------------------------------------------------------- */
.wrapper {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

#document-content {
    margin-left: var(--sidebar-width);
    padding: var(--space-xl) var(--space-2xl);
    min-height: 100vh;
    width: calc(100% - var(--sidebar-width));
    z-index: 1;
    position: relative;
}


/* -- Sidebar
---------------------------------------------------------------------- */
#sidebar {
    background: url(../img/01.jpg) center/cover no-repeat;
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    position: fixed;
    top: 0;
    left: 0;
    height: 100vh;
    z-index: 999;
    color: #fff;
    transition: all var(--transition-base);
    overflow: hidden;
}

#sidebar:after {
    content: '';
    width: 100%;
    height: 100%;
    background: var(--color-sidebar-bg);
    position: absolute;
    top: 0;
    left: 0;
    z-index: -1;
}

#sidebar.active {
    margin-left: calc(-1 * var(--sidebar-width) + 30px);
}

#sidebar .sidebar-header {
    padding: var(--space-lg) var(--space-lg) var(--space-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--space-md);
}

#sidebar .sidebar-scroll {
    width: 100%;
    height: calc(100vh - 140px);
    position: relative;
    overflow-y: auto;
    padding: var(--space-sm) 0;
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.15) transparent;
}

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

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

#sidebar .sidebar-scroll::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.15);
    border-radius: 4px;
}

#sidebar ul {
    margin-top: 0;
}

#sidebar ul p {
    color: #fff;
    padding: 10px;
}

#sidebar ul li {
    position: relative;
}

#sidebar ul li a {
    padding: 9px var(--space-lg);
    font-size: 0.875rem;
    font-weight: 400;
    display: block;
    color: rgba(255, 255, 255, 0.7);
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
    letter-spacing: 0.2px;
}

#sidebar ul li a:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.05);
}

#sidebar ul li.active > a,
#sidebar ul li a.active {
    color: #fff;
    background: rgba(0, 188, 212, 0.12);
    border-left-color: var(--color-primary);
    font-weight: 500;
}

a[aria-expanded="true"] {
    color: #fff !important;
}

a[data-toggle="collapse"] {
    position: relative;
}

.nav-dropdown::after {
    content: "";
    position: absolute;
    display: block;
    right: 20px;
    left: auto;
    width: 0;
    height: 0;
    border-top: 5px solid transparent;
    border-left: 5px solid;
    border-bottom: 5px solid transparent;
    opacity: .35;
    transition: all var(--transition-fast);
    transform: translateY(-16px);
}

.nav-dropdown.active::after {
    transform: translateY(-16px) rotate(90deg);
    opacity: .6;
}

#sidebar ul ul a {
    font-size: 0.825rem !important;
    padding-left: 36px !important;
    color: rgba(255, 255, 255, 0.55) !important;
}

#sidebar ul ul a:hover {
    color: rgba(255, 255, 255, 0.9) !important;
}

.dropdown-container {
    display: none;
    background-color: rgba(0, 0, 0, 0.15);
}

/* Sidebar toggle button */
#sidebarCollapse {
    position: fixed;
    left: var(--sidebar-width);
    top: var(--space-md);
    z-index: 1000;
    display: none;
    background: var(--color-primary);
    border: none;
    border-radius: 0 var(--border-radius-sm) var(--border-radius-sm) 0;
    padding: 10px 12px;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

#sidebarCollapse span {
    width: 20px;
    height: 2px;
    background: #fff;
    display: block;
    margin: 4px 0;
    transition: all var(--transition-fast);
}

#document-copyright {
    position: absolute;
    bottom: 10px;
    font-size: 11px;
    left: var(--space-md);
    width: 200px;
    text-align: left;
    z-index: 1;
    color: rgba(255, 255, 255, 0.4);
}


/* -- Content Typography
---------------------------------------------------------------------- */
#document-content section {
    padding-top: var(--space-3xl);
}

#document-content h1 {
    font-size: clamp(1.5rem, 3vw, 1.875rem);
    font-weight: 700;
    color: var(--color-heading);
    line-height: 1.3;
}

#document-content h2 {
    font-size: clamp(1.125rem, 2vw, 1.25rem);
    margin-bottom: var(--space-md);
    font-weight: 400;
    color: var(--color-text-secondary);
}

#document-content h3 {
    font-size: clamp(1.375rem, 2.5vw, 1.75rem);
    font-weight: 600;
    color: var(--color-heading);
    position: relative;
    margin-bottom: var(--space-xl);
    padding: 0 0 var(--space-md) 0;
}

#document-content h3::after {
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    position: absolute;
    content: "";
    bottom: 0;
    left: 0;
    border-radius: 3px;
}

#document-content h4 {
    font-size: 1.0625rem;
    margin: var(--space-lg) 0 var(--space-md);
    font-weight: 600;
    color: var(--color-heading);
    position: relative;
    padding-left: var(--space-md);
}

#document-content h4::after {
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-primary), var(--color-accent));
    position: absolute;
    content: "";
    top: 0;
    left: 0;
    border-radius: 4px;
}

#document-content h5 {
    font-size: 1rem;
    margin: var(--space-md) 0;
    font-weight: 500;
    color: var(--color-text);
}

#document-content h6 {
    font-size: 0.875rem;
    margin: var(--space-md) 0;
    font-weight: 500;
    color: var(--color-text-secondary);
}

#document-content p {
    margin: var(--space-md) 0;
    font-size: 0.9375rem;
    line-height: 1.8;
    color: var(--color-text);
}

#document-content ul,
#document-content ol {
    margin-top: var(--space-lg);
}

#document-content ul li,
#document-content ol li {
    font-size: 0.9375rem;
    padding-left: 22px;
    line-height: 1.7;
    background: url(../img/right-arrowheads.png) no-repeat top 7px left;
    background-size: 10px;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}


/* -- Section Title Numbers
---------------------------------------------------------------------- */
.page-header {
    margin-bottom: var(--space-lg);
}

.title-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 1rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: #fff;
    border-radius: var(--border-radius-sm);
    min-width: 36px;
    height: 36px;
    padding: 0 10px;
    text-align: center;
    margin-right: var(--space-sm);
    flex-shrink: 0;
    white-space: nowrap;
}

#document-content .sub-content .title-number {
    font-size: 0.875rem;
    min-width: 32px;
    height: 32px;
    padding: 0 8px;
}

#document-content .sub-content {
    margin-top: var(--space-2xl);
    margin-left: var(--space-lg);
    margin-right: var(--space-lg);
}

#document-content .sub-content h3 {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
}

#documenter_cover {
    position: relative;
    height: auto;
    padding-top: var(--space-3xl);
}

#documenter_cover li {
    list-style: none !important;
    margin-left: 0 !important;
}


/* -- Introduction Section
---------------------------------------------------------------------- */
ul#menu {
    list-style: none;
    padding-left: 0;
    margin-bottom: 0;
}

ul#menu li {
    background-position: top 7px left;
    vertical-align: middle;
}

.intro-modules-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin: var(--space-xl) 0;
}

.intro-module-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--space-lg);
    transition: all var(--transition-base);
}

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

.intro-module-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.intro-module-card h4 {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-heading);
    padding-left: 0;
}

.intro-module-card h4::after {
    display: none;
}

.intro-module-icon {
    width: 40px;
    height: 40px;
    min-width: 40px;
    border-radius: var(--border-radius-sm);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 12px rgba(0, 188, 212, 0.25);
}

.intro-module-icon i {
    color: #fff;
    font-size: 16px;
}

.intro-module-card ul#menu li {
    font-size: 0.8125rem;
    line-height: 1.6;
    margin-bottom: 2px;
    color: var(--color-text-secondary);
}

/* Highlights */
.intro-highlights {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-lg);
    margin: var(--space-xl) 0;
}

.intro-highlight-item {
    display: flex;
    gap: var(--space-md);
    align-items: flex-start;
    background: var(--color-primary-light);
    border-left: 3px solid var(--color-primary);
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
    padding: var(--space-lg) var(--space-lg);
}

.intro-highlight-item > i {
    font-size: 22px;
    color: var(--color-primary);
    margin-top: 2px;
    flex-shrink: 0;
}

.intro-highlight-item strong {
    display: block;
    font-size: 0.9375rem;
    margin-bottom: var(--space-xs);
    color: var(--color-heading);
}

.intro-highlight-item p {
    margin: 0;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Meta info */
.intro-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm) var(--space-xl);
    margin: var(--space-xl) 0;
    padding: var(--space-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--border-radius);
    border: 1px solid var(--color-border);
}

.intro-meta-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.875rem;
    color: var(--color-text);
}

.intro-meta-item > i {
    color: var(--color-primary);
    font-size: 14px;
    width: 18px;
    text-align: center;
}


/* -- Code Blocks
---------------------------------------------------------------------- */
#document-content code {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    background: var(--color-bg-tertiary);
    padding: 2px 8px;
    border-radius: 4px;
    color: #d946aa;
    border: 1px solid var(--color-border);
    white-space: nowrap;
}

#document-content code.cmd {
    background: #1e293b;
    color: #5eead4;
    border-color: #334155;
    cursor: pointer;
    position: relative;
    transition: background var(--transition-fast);
}

#document-content code.cmd:hover {
    background: #334155;
}

#document-content code.cmd::after {
    content: '\f0c5';
    font-family: 'FontAwesome';
    font-size: 0.625rem;
    margin-left: 6px;
    opacity: 0;
    color: #94a3b8;
    transition: opacity var(--transition-fast);
}

#document-content code.cmd:hover::after {
    opacity: 1;
}

#document-content code.cmd.copied {
    background: #064e3b;
    border-color: var(--color-success);
}

#document-content code.cmd.copied::after {
    content: '\f00c';
    color: var(--color-success);
    opacity: 1;
}

#document-content code.path {
    background: #fffbeb;
    color: #92400e;
    border-color: #fde68a;
}

#document-content pre {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius);
    padding: var(--space-lg);
    overflow-x: auto;
    margin: var(--space-lg) 0;
}

#document-content pre code {
    background: none;
    border: none;
    padding: 0;
    font-size: 0.8125rem;
    line-height: 1.7;
    color: var(--color-text);
}


/* -- Tables
---------------------------------------------------------------------- */
#document-content table {
    border-collapse: collapse;
    width: 100%;
    margin: var(--space-lg) 0;
    border-radius: var(--border-radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

#document-content table th {
    font-weight: 600;
    font-size: 0.875rem;
    background: var(--color-bg-secondary);
    color: var(--color-heading);
}

#document-content table th,
#document-content table td {
    padding: var(--space-sm) var(--space-md);
    text-align: left;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.875rem;
}

#document-content table tr:last-child td {
    border-bottom: none;
}

#document-content table tr:hover td {
    background: var(--color-bg-secondary);
}

/* -- Definition Lists
---------------------------------------------------------------------- */
#document-content dl dt {
    padding-top: var(--space-md);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--color-heading);
}

#document-content dl dd {
    padding-top: var(--space-xs);
    margin-left: var(--space-md);
    color: var(--color-text-secondary);
}


/* -- Images & Screenshots
---------------------------------------------------------------------- */
#document-content img {
    width: 100%;
    border-radius: var(--border-radius);
    overflow: hidden;
    margin-bottom: var(--space-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    transition: box-shadow var(--transition-base);
}

#document-content img:hover {
    box-shadow: var(--shadow-xl);
}

.footer-logo {
    width: auto !important;
    border-radius: 0 !important;
    box-shadow: none !important;
    border: none !important;
}

#documenent-sidebar {
    background: url("../img/01.jpg") center/cover no-repeat;
}

.documenent-sidebar-in {
    background: rgba(0, 0, 0, 0.8);
    height: 100%;
}

.logo {
    padding: 20px 0 10px 0;
}

.preview {
    max-height: 600px;
    box-shadow: var(--shadow-lg);
    clear: both;
    margin: var(--space-lg);
}


/* -- Accordion / FAQ
---------------------------------------------------------------------- */
.accordion-section .panel-group {
    margin-bottom: 0;
}

.accordion-section .panel {
    border: 1px solid var(--color-border);
    border-radius: var(--border-radius-sm) !important;
    margin-bottom: 10px !important;
    overflow: hidden;
    box-shadow: none;
}

.accordion-section .panel-default > .panel-heading {
    border: 0;
    background: #fff !important;
    padding: 0 !important;
    margin: 0 !important;
    border-radius: 0;
}

.accordion-section .panel-default > .panel-heading:hover {
    background: var(--color-bg-secondary) !important;
}

.accordion-section .panel-default .panel-title {
    margin: 0 !important;
    padding: 0 !important;
}

.accordion-section .panel-default .panel-title a,
.accordion-section .panel-default .panel-title a:hover,
.accordion-section .panel-default .panel-title a:focus,
.accordion-section .panel-default .panel-title a:active {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.875rem;
    font-weight: 500;
    padding: 12px 16px !important;
    margin: 0;
    color: var(--color-heading) !important;
    text-decoration: none;
    line-height: 1.4;
}

.accordion-section .panel-default .panel-title a:after {
    font-family: 'FontAwesome';
    font-style: normal;
    font-size: 0.875rem;
    content: "\f077";
    color: var(--color-primary);
    flex-shrink: 0;
    margin-left: var(--space-md);
}

.accordion-section .panel-default .panel-title a.collapsed:after {
    content: "\f078";
    color: var(--color-text-light);
}

.accordion-section .panel-default .panel-body {
    font-size: 0.875rem;
    padding: 12px 16px !important;
    margin: 0 !important;
    color: var(--color-text);
    line-height: 1.7;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.accordion-section .panel-default .panel-body ul {
    margin: 0;
}

.accordion-section .panel-default .panel-body ul li {
    margin-bottom: 4px;
}


/* -- Back to Top Button
---------------------------------------------------------------------- */
#backToTop {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    border: none;
    cursor: pointer;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    z-index: 900;
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-base);
}

#backToTop.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

#backToTop:hover {
    background: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}


/* -- Reading Progress Bar
---------------------------------------------------------------------- */
#progressBar {
    position: fixed;
    top: 0;
    left: var(--sidebar-width);
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    z-index: 10000;
    transition: transform 0.1s linear;
    transform-origin: left;
    transform: scaleX(0);
}


/* -- Image Lightbox
---------------------------------------------------------------------- */
#lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.92);
    z-index: 10001;
    display: none;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl);
    cursor: zoom-out;
}

#lightbox.active {
    display: flex;
}

#lightboxImg {
    max-width: 90vw;
    max-height: 90vh;
    border-radius: var(--border-radius);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    object-fit: contain;
    animation: lightboxIn 0.25s ease;
    border: none !important;
    width: auto !important;
    margin: 0 !important;
}

@keyframes lightboxIn {
    from { transform: scale(0.92); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

#lightboxClose {
    position: absolute;
    top: 20px;
    right: 24px;
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    font-size: 24px;
    cursor: pointer;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: all var(--transition-fast);
}

#lightboxClose:hover {
    color: #fff;
    background: rgba(255, 255, 255, 0.1);
}

#document-content img:not(.footer-logo) {
    cursor: zoom-in;
}


/* -- Search
---------------------------------------------------------------------- */
.sidebar-search {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin: 0 var(--space-md) var(--space-sm);
    padding: 8px 14px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius-sm);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8125rem;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.sidebar-search:hover {
    background: rgba(255, 255, 255, 0.12);
    border-color: rgba(255, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.7);
}

.sidebar-search i {
    font-size: 12px;
}

.sidebar-search span {
    flex: 1;
}

.sidebar-search kbd {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 4px;
    padding: 1px 6px;
    font-size: 0.6875rem;
    font-family: var(--font-sans);
    color: rgba(255, 255, 255, 0.4);
}

#searchOverlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    z-index: 10002;
    display: none;
    align-items: flex-start;
    justify-content: center;
    padding-top: 12vh;
}

#searchOverlay.active {
    display: flex;
}

#searchBox {
    width: 90%;
    max-width: 600px;
    background: var(--color-bg);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
    animation: lightboxIn 0.2s ease;
}

#searchInputWrap {
    display: flex;
    align-items: center;
    padding: var(--space-md) var(--space-lg);
    border-bottom: 1px solid var(--color-border);
    gap: var(--space-sm);
}

#searchInputWrap i {
    color: var(--color-text-light);
    font-size: 16px;
    flex-shrink: 0;
}

#searchInput {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1rem;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: transparent;
}

#searchInput::placeholder {
    color: var(--color-text-light);
}

#searchClose {
    background: none;
    border: none;
    color: var(--color-text-light);
    cursor: pointer;
    font-size: 14px;
    padding: 4px;
    border-radius: 4px;
    transition: all var(--transition-fast);
}

#searchClose:hover {
    color: var(--color-text);
    background: var(--color-bg-tertiary);
}

#searchResults {
    max-height: 50vh;
    overflow-y: auto;
    padding: var(--space-sm);
}

#searchResults:empty::after {
    content: 'Type to search...';
    display: block;
    padding: var(--space-xl);
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.875rem;
}

.search-result {
    display: block;
    padding: 10px var(--space-md);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: background var(--transition-fast);
    text-decoration: none;
}

.search-result:hover {
    background: var(--color-bg-secondary);
    text-decoration: none;
}

.search-result-title {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-heading);
    margin-bottom: 2px;
}

.search-result-section {
    font-size: 0.75rem;
    color: var(--color-text-light);
}

.search-result mark {
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    border-radius: 2px;
    padding: 0 2px;
}

.search-no-results {
    padding: var(--space-xl);
    text-align: center;
    color: var(--color-text-light);
    font-size: 0.875rem;
}


/* -- Breadcrumb + Content Topbar
---------------------------------------------------------------------- */
#contentTopbar {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
    margin-bottom: var(--space-md);
    background: var(--color-bg);
    z-index: 100;
    border-bottom: 1px solid var(--color-border-light);
}

#breadcrumb {
    font-size: 0.8125rem;
    color: var(--color-text-light);
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

#breadcrumbTrail a {
    color: var(--color-text-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

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

#breadcrumbTrail .breadcrumb-sep {
    margin: 0 6px;
    color: var(--color-border);
}

#breadcrumbTrail .breadcrumb-current {
    color: var(--color-text);
    font-weight: 500;
}



/* -- Footer
---------------------------------------------------------------------- */
#docFooter {
    margin-left: var(--sidebar-width);
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: rgba(255, 255, 255, 0.7);
    padding: var(--space-2xl) var(--space-xl);
    text-align: center;
}

.footer-inner {
    max-width: var(--content-max-width);
    margin: 0 auto;
}

.footer-brand {
    margin-bottom: var(--space-lg);
}

.footer-brand .footer-logo {
    width: 120px !important;
    border: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
    margin-bottom: var(--space-sm) !important;
    filter: brightness(0) invert(1);
    opacity: 0.9;
}

.footer-tagline {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.4);
    margin: 0;
    letter-spacing: 0.5px;
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-md) var(--space-xl);
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.55);
    text-decoration: none;
    font-size: 0.8125rem;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
}

.footer-links a i {
    font-size: 12px;
}

.footer-bottom {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-sm);
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.3);
}

.footer-divider {
    color: rgba(255, 255, 255, 0.15);
}

.footer-version {
    color: var(--color-primary);
    font-weight: 500;
}


/* -- Scroll Reveal Animations
---------------------------------------------------------------------- */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal.delay-1 { transition-delay: 0.1s; }
.reveal.delay-2 { transition-delay: 0.2s; }
.reveal.delay-3 { transition-delay: 0.3s; }




/* -- Dark Mode
---------------------------------------------------------------------- */
body.dark-mode {
    --color-text: #e2e8f0;
    --color-text-secondary: #94a3b8;
    --color-text-light: #64748b;
    --color-heading: #f1f5f9;
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #1e293b;
    --color-border: #334155;
    --color-border-light: #1e293b;
    --color-link: #22d3ee;
    --color-link-hover: #67e8f9;
    --color-code-bg: #1e293b;
    --color-sidebar-bg: rgba(2, 6, 23, 0.96);
}

body.dark-mode::before {
    opacity: 0.02;
}

body.dark-mode #document-content code {
    color: #f472b6;
    background: #1e293b;
    border-color: #334155;
}

body.dark-mode #document-content code.cmd {
    background: #0f172a;
    border-color: #1e293b;
}

body.dark-mode #document-content code.path {
    background: #422006;
    color: #fbbf24;
    border-color: #713f12;
}

body.dark-mode .intro-module-card {
    background: #1e293b;
    border-color: #334155;
}

body.dark-mode .intro-highlight-item {
    background: rgba(0, 188, 212, 0.08);
    border-color: var(--color-primary-dark);
}

body.dark-mode .accordion-section .panel {
    border-color: #334155;
}

body.dark-mode .accordion-section .panel-default > .panel-heading {
    background: #1e293b !important;
}

body.dark-mode .accordion-section .panel-default > .panel-heading:hover {
    background: #334155 !important;
}

body.dark-mode .accordion-section .panel-default .panel-body {
    background: #0f172a;
    border-color: #334155;
}

body.dark-mode #document-content img {
    border-color: #334155;
    opacity: 0.92;
}

body.dark-mode #contentTopbar {
    background: #0f172a;
    border-color: #1e293b;
}

body.dark-mode #sidebar {
    background: var(--color-sidebar-bg);
}

#darkModeToggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    cursor: pointer;
    font-size: 14px;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

#darkModeToggle:hover {
    background: var(--color-primary-light);
    color: var(--color-primary);
    border-color: var(--color-primary);
}

body.dark-mode #darkModeToggle {
    background: #334155;
    border-color: #475569;
    color: #fbbf24;
}

body.dark-mode #darkModeToggle:hover {
    background: #475569;
}


/* -- Reading Time Badge
---------------------------------------------------------------------- */
.reading-time-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--color-primary-light);
    color: var(--color-primary-dark);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8125rem;
    font-weight: 500;
}

body.dark-mode .reading-time-badge {
    background: rgba(0, 188, 212, 0.12);
    color: var(--color-primary);
}


/* -- External Link Indicator
---------------------------------------------------------------------- */
#document-content a[target="_blank"]::after,
#document-content a[href^="http"]::after {
    content: '\f08e';
    font-family: 'FontAwesome';
    font-size: 0.625rem;
    margin-left: 4px;
    opacity: 0.5;
    vertical-align: super;
}

.footer-links a::after {
    content: none !important;
}


/* -- Keyboard Navigation Highlight
---------------------------------------------------------------------- */
.kbd-focus-highlight {
    outline: 2px solid var(--color-primary);
    outline-offset: -2px;
    border-radius: var(--border-radius);
    animation: kbdPulse 0.3s ease;
}

@keyframes kbdPulse {
    0% { outline-color: transparent; }
    100% { outline-color: var(--color-primary); }
}

/* -- Utility Classes
---------------------------------------------------------------------- */
.text-info {
    color: var(--color-primary) !important;
}

.text-danger {
    color: var(--color-danger) !important;
}


/* -- Responsive Design
---------------------------------------------------------------------- */

/* Large tablets / small desktops */
@media (max-width: 1200px) {
    #document-content {
        padding: var(--space-lg) var(--space-xl);
    }
}

/* Tablets */
@media (max-width: 1024px) {
    :root {
        --sidebar-width: 260px;
    }

    #sidebarCollapse {
        display: block;
        left: var(--space-md);
    }

    #sidebar {
        margin-left: calc(-1 * var(--sidebar-width));
    }

    #sidebar.active {
        margin-left: 0;
        box-shadow: var(--shadow-xl);
    }

    body.sidebar-open::after {
        content: '';
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.4);
        z-index: 998;
        backdrop-filter: blur(2px);
    }

    #document-content {
        margin-left: 0;
        width: 100%;
        padding: var(--space-lg) var(--space-xl);
        padding-top: var(--space-3xl);
    }

    #progressBar {
        left: 0;
    }

    #docFooter {
        margin-left: 0;
    }
}

/* Mobile landscape / small tablets */
@media (max-width: 768px) {
    #document-content {
        padding: var(--space-md) var(--space-lg);
        padding-top: var(--space-3xl);
    }

    #document-content section {
        padding-top: var(--space-2xl);
    }

    #document-content .sub-content {
        margin-left: var(--space-md);
        margin-right: var(--space-md);
    }

    .intro-modules-grid,
    .intro-highlights {
        grid-template-columns: 1fr;
    }

    .intro-meta {
        flex-direction: column;
        gap: var(--space-sm);
    }

    #document-content h3 {
        font-size: 1.375rem;
    }

    .title-number {
        width: 34px;
        height: 34px;
        font-size: 1rem;
    }

    #document-content code {
        white-space: normal;
        word-break: break-word;
    }
}

/* Mobile portrait */
@media (max-width: 480px) {
    :root {
        --sidebar-width: 260px;
    }

    #document-content {
        padding: var(--space-md);
        padding-top: var(--space-2xl);
    }

    #document-content section {
        padding-top: var(--space-xl);
    }

    #document-content .sub-content {
        margin-left: var(--space-sm);
        margin-right: var(--space-sm);
    }

    #document-content h3 {
        font-size: 1.25rem;
    }

    #document-content h4 {
        font-size: 1rem;
    }

    .intro-module-card {
        padding: var(--space-md);
    }

    .intro-highlight-item {
        flex-direction: column;
        gap: var(--space-sm);
    }

    body::before {
        display: none;
    }

    #backToTop {
        bottom: 16px;
        right: 16px;
        width: 38px;
        height: 38px;
        font-size: 14px;
    }

    #searchOverlay {
        padding-top: var(--space-lg);
    }

    .sidebar-search kbd {
        display: none;
    }
}

/* Print styles */
@media print {
    #sidebar,
    #sidebarCollapse,
    #backToTop,
    #progressBar,
    #lightbox,
    #searchOverlay,
    #contentTopbar,
    #docFooter {
        display: none !important;
    }

    #document-content {
        margin-left: 0;
        padding: 0;
        width: 100%;
    }

    #document-content section {
        padding-top: 20px;
        page-break-inside: avoid;
    }

    #document-content img {
        box-shadow: none;
        border: 1px solid #ccc;
        max-width: 80%;
        page-break-inside: avoid;
    }

    #document-content h3 {
        page-break-after: avoid;
    }

    #document-content code.cmd {
        background: #eee;
        color: #333;
        border-color: #ccc;
    }

    .intro-modules-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    a[href^="http"]::after {
        content: " (" attr(href) ")";
        font-size: 0.75rem;
        color: #666;
    }
}