/* Modern CSS with custom properties for theming */
:root {
    /* Brand colors - preserving scikit-image orange */
    --brand-orange: #CE5C00;
    --brand-orange-hover: #A04900;
    --brand-orange-light: #F07000;

    /* Light mode colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-tertiary: #e9ecef;
    --text-primary: #212529;
    --text-secondary: #6c757d;
    --text-muted: #999999;
    --border-color: #dee2e6;
    --link-color: var(--brand-orange);
    --link-hover: var(--brand-orange-hover);
    --code-bg: #f8f9fa;
    --table-border: #cccccc;
    --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.075);
    --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.15);

    /* Chat button */
    --chat-bg: #36bc98;
    --chat-hover: #3ea07f;

    /* Logo colors */
    --logo-title: #333333;
    --logo-tagline: #666666;

    /* Citation colors */
    --citation-text: #004085;
    --citation-bg: #cce5ff;
    --citation-border: #b8daff;
    --citation-accent: #007bff;

    /* Typography */
    --font-family-sans: "Lato", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-family-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, "Courier New", monospace;

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

    /* Border radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.375rem;
    --radius-lg: 0.5rem;
    --radius-full: 50%;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;
}

/* Dark mode */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-primary: #1a1a1a;
        --bg-secondary: #2d2d2d;
        --bg-tertiary: #3a3a3a;
        --text-primary: #e9ecef;
        --text-secondary: #adb5bd;
        --text-muted: #868e96;
        --border-color: #495057;
        --link-color: var(--brand-orange-light);
        --link-hover: var(--brand-orange);
        --code-bg: #2d2d2d;
        --table-border: #495057;
        --shadow-sm: 0 0.125rem 0.25rem rgba(0, 0, 0, 0.3);
        --shadow-md: 0 0.5rem 1rem rgba(0, 0, 0, 0.5);

        /* Logo colors */
        --logo-title: #e9ecef;
        --logo-tagline: #adb5bd;

        /* Citation colors */
        --citation-text: #9ec5fe;
        --citation-bg: #1c2a3a;
        --citation-border: #2c5282;
    }
}

/* Base styles */
body {
    font-family: var(--font-family-sans);
    letter-spacing: 0.01em;
    font-size: 1rem;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    transition: background-color var(--transition-base), color var(--transition-base);
}

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

a:hover,
a:focus {
    color: var(--link-hover);
    text-decoration: underline;
}

a:focus-visible {
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Skip link for accessibility */
.skip-link {
    position: absolute;
    top: 0;
    left: 0;
    background: var(--brand-orange);
    color: white;
    padding: var(--space-sm) var(--space-md);
    text-decoration: none;
    z-index: 9999;
}

.skip-link:focus {
    outline: 2px solid white;
    outline-offset: 2px;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    clear: left;
    margin-top: var(--space-lg);
    margin-bottom: var(--space-md);
    font-weight: 600;
    line-height: 1.3;
    color: var(--text-primary);
}

h1 {
    font-size: 2rem;
    margin-top: var(--space-xl);
}

h2 {
    font-size: 1.6rem;
}

h3 {
    font-size: 1.3rem;
}

h4 {
    font-size: 1.1rem;
}

h5 {
    font-size: 1rem;
}

h6 {
    font-size: 0.9rem;
}

li {
    line-height: 1.6;
}

code, pre {
    font-family: var(--font-family-mono);
    background-color: var(--code-bg);
    border-radius: var(--radius-sm);
}

code {
    padding: 0.125rem 0.25rem;
    font-size: 0.875em;
}

pre {
    padding: var(--space-md);
    overflow-x: auto;
    border: 1px solid var(--border-color);
}

/* Header & Logo */
header {
    padding: var(--space-2xl) 0 0 0;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: 0;
    transition: transform var(--transition-fast);
    text-decoration: none;
}

.logo:hover {
    transform: scale(1.02);
    text-decoration: none;
}

.logo img {
    height: 70px;
    width: auto;
    display: block;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-family: 'Ubuntu', var(--font-family-sans);
    font-size: 2.2rem;
    font-weight: 300;
    color: var(--logo-title);
    line-height: 1.1;
}

.logo-tagline {
    font-family: 'Ubuntu', var(--font-family-sans);
    font-size: 1rem;
    font-weight: 300;
    color: var(--logo-tagline);
}

/* Navigation */
nav.navbar {
    background-color: transparent;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: var(--space-lg);
    padding-top: var(--space-md);
    padding-bottom: var(--space-md);
}

.navbar-nav .nav-link {
    color: var(--text-primary) !important;
    font-weight: 500;
    padding: 0.5rem 1rem !important;
}

.navbar-nav .nav-item:first-child .nav-link {
    padding-left: 0 !important;
}

.navbar-nav .nav-link:hover {
    color: var(--link-color) !important;
}

.navbar-toggler {
    border-color: var(--border-color);
}

.navbar-toggler-icon {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(33, 37, 41, 0.75)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

@media (prefers-color-scheme: dark) {
    .navbar-toggler-icon {
        background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='rgba(255, 255, 255, 0.75)' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
    }
}

.github-icon {
    height: 15px;
    width: 15px;
    display: inline;
    vertical-align: text-bottom;
    margin-right: var(--space-xs);
}

/* Search form */
.search-form {
    min-width: 300px;
}

.search-form .form-control {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border-color: var(--border-color);
}

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

.search-form .form-control:focus {
    border-color: var(--link-color);
    box-shadow: 0 0 0 0.2rem rgba(206, 92, 0, 0.25);
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

/* Sidebar */
.sidebar {
    position: sticky;
    top: var(--space-md);
    max-height: calc(100vh - var(--space-xl));
    overflow-y: auto;
}

.sidebar-box {
    margin-bottom: var(--space-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

.sidebar-box .card-body {
    padding: var(--space-md);
}

.sidebar-box .nav-link {
    padding: var(--space-sm) var(--space-md);
    color: var(--text-primary);
    border-left: 3px solid transparent;
    transition: all var(--transition-fast);
    display: flex;
    flex-direction: column;
}

.sidebar-box .nav-link:hover,
.sidebar-box .nav-link:focus {
    background-color: var(--bg-tertiary);
    border-left-color: var(--link-color);
    text-decoration: none;
}

/* Fix button icon alignment */
.sidebar-box .btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-xs);
}

.sidebar-box .btn svg {
    flex-shrink: 0;
    margin-top: -2px;
}

/* Override Bootstrap button colors with brand orange */
.btn-primary,
.btn-primary:link,
.btn-primary:visited {
    --bs-btn-bg: var(--brand-orange);
    --bs-btn-border-color: var(--brand-orange);
    --bs-btn-hover-bg: var(--brand-orange-hover);
    --bs-btn-hover-border-color: var(--brand-orange-hover);
    --bs-btn-active-bg: var(--brand-orange-hover);
    --bs-btn-active-border-color: var(--brand-orange-hover);
    background-color: var(--brand-orange) !important;
    border-color: var(--brand-orange) !important;
}

.btn-primary:hover,
.btn-primary:focus,
.btn-primary:active {
    background-color: var(--brand-orange-hover) !important;
    border-color: var(--brand-orange-hover) !important;
}

.btn-outline-primary,
.btn-outline-primary:link,
.btn-outline-primary:visited {
    --bs-btn-color: var(--brand-orange);
    --bs-btn-border-color: var(--brand-orange);
    --bs-btn-hover-bg: var(--brand-orange);
    --bs-btn-hover-border-color: var(--brand-orange);
    --bs-btn-active-bg: var(--brand-orange);
    --bs-btn-active-border-color: var(--brand-orange);
    color: var(--brand-orange) !important;
    border-color: var(--brand-orange) !important;
    background-color: transparent !important;
}

.btn-outline-primary:hover,
.btn-outline-primary:focus,
.btn-outline-primary:active {
    background-color: var(--brand-orange) !important;
    border-color: var(--brand-orange) !important;
    color: white !important;
}

.sidebar-subtitle {
    font-size: 0.8em;
    color: var(--text-secondary);
    font-style: italic;
    margin-top: 0.125rem;
}

/* Main content */
main {
    min-height: 50vh;
}

/* Ensure proper spacing before major sections */
main > div > h2:not(:first-child) {
    margin-top: var(--space-2xl);
}

/* Hero section */
.hero {
    padding: var(--space-lg) var(--space-lg) var(--space-md) var(--space-lg);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--space-xl);
    overflow: hidden;
}

.hero h2:first-of-type {
    margin-top: 0;
    margin-bottom: var(--space-md);
    clear: none;
}

.hero > *:last-child {
    margin-bottom: 0;
}

.gallery-random {
    float: right;
    margin-left: var(--space-md);
    margin-bottom: 0;
    padding: var(--space-md);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background-color: var(--bg-primary);
    max-width: calc(180px + 2 * var(--space-md) + 2px);
}

.gallery-random img {
    display: block;
    max-height: 180px;
    max-width: 180px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--space-md);
}

.coins-sample {
    float: left;
    padding: var(--space-sm);
    margin-bottom: var(--space-md);
}

.coins-sample img {
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
}

/* Clear floats before major sections */
.section > h2 {
    clear: both;
}

.summary-box {
    max-width: 100%;
}

/* Citation box */
.citation {
    color: var(--citation-text);
    background-color: var(--citation-bg);
    border-color: var(--citation-border);
    border-left: 4px solid var(--citation-accent);
    padding: var(--space-lg);
}

/* Permalink/headerlink */
.headerlink {
    margin-left: var(--space-sm);
    color: transparent;
    display: inline-block;
    text-decoration: none;
    transition: color var(--transition-fast);
    opacity: 0;
}

h1:hover .headerlink,
h2:hover .headerlink,
h3:hover .headerlink,
h4:hover .headerlink,
h5:hover .headerlink,
h6:hover .headerlink {
    opacity: 1;
    color: var(--text-muted);
}

.headerlink:hover,
.headerlink:focus {
    color: var(--link-color);
    text-decoration: none;
}

.headerlink:focus-visible {
    opacity: 1;
    outline: 2px solid var(--link-color);
    outline-offset: 2px;
}

/* Footer */
.footer {
    margin-top: var(--space-2xl);
    padding: var(--space-xl) var(--space-md);
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    background-color: var(--bg-secondary);
    border-radius: var(--radius-md);
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.footer-brand {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--text-primary);
    text-decoration: none;
    font-family: 'Ubuntu', sans-serif;
    font-weight: 400;
    font-size: 1.1rem;
}

.footer-logo:hover {
    color: var(--link-color);
    text-decoration: none;
}

.footer-logo img {
    border-radius: var(--radius-sm);
}

.footer-tagline {
    margin: 0;
    font-family: 'Ubuntu', sans-serif;
    font-weight: 300;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.footer-meta {
    flex: 1;
    text-align: center;
    color: var(--text-muted);
}

.footer-meta a {
    color: var(--text-secondary);
}

.footer-meta a:hover,
.footer-meta a:focus {
    color: var(--link-color);
}

.footer-social {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-md);
}

.footer-social-text {
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: right;
    line-height: 1.4;
}

.footer-social a {
    transition: opacity var(--transition-fast);
}

.footer-social a:hover,
.footer-social a:focus {
    opacity: 0.8;
}

.footer-social svg {
    display: block;
}

@media (max-width: 767.98px) {
    .footer-content {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
}

/* Chat button */
.chatbutton {
    margin: 0;
    background: var(--chat-bg);
    padding: var(--space-md) var(--space-lg);
    position: fixed;
    bottom: 0;
    right: 1rem;
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    z-index: 1000;
}

.chatbutton:hover {
    background-color: var(--chat-hover);
    transform: translateY(-2px);
    box-shadow: 0 0.75rem 1.5rem rgba(0, 0, 0, 0.2);
}

.chatbutton a {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    text-decoration: none;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

.chatbutton-logo {
    width: 24px;
    height: 24px;
}

.chatbutton a:hover,
.chatbutton a:focus {
    color: white;
    text-decoration: none;
}

.chatbutton a:focus-visible {
    outline: 2px solid white;
    outline-offset: 4px;
    border-radius: var(--radius-sm);
}

/* Documentation tables */
table.docutils {
    margin-bottom: var(--space-lg);
    border-color: var(--table-border);
    width: 100%;
    border-collapse: collapse;
}

table.docutils td,
table.docutils th {
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--table-border);
    text-align: left;
}

table.docutils th {
    background-color: var(--bg-secondary);
    font-weight: 600;
}

/* TOC */
.toc ul ul {
    font-size: 0.9rem;
    margin-right: calc(-1 * var(--space-md));
}

/* Content table */
.contentstable.docutils,
.contentstable.docutils td {
    border-color: transparent;
}

.contentstable.docutils .first {
    font-weight: 600;
}

.contentstable.docutils .last {
    padding-left: var(--space-md);
}

/* Module summary table */
.longtable.docutils {
    font-size: 0.9rem;
    margin-bottom: var(--space-xl);
}

.longtable.docutils,
.longtable.docutils td {
    border-color: var(--table-border);
}

/* Function and class descriptions */
dl.class,
dl.function,
dl.method,
dl.attribute {
    border-top: 1px solid var(--border-color);
    padding-top: var(--space-md);
    margin-top: var(--space-lg);
}

.descclassname {
    color: var(--text-secondary);
    font-weight: 400;
    font-family: var(--font-family-mono);
}

.descname {
    font-family: var(--font-family-mono);
    font-weight: 600;
}

dl.class em,
dl.function em,
dl.class big,
dl.function big {
    font-weight: 400;
    font-family: var(--font-family-mono);
}

dl.class dd,
dl.function dd {
    padding: var(--space-md);
}

.docutils.field-list th {
    background-color: var(--bg-secondary);
    padding: var(--space-md);
    text-align: left;
    vertical-align: top;
    min-width: 100px;
    font-weight: 600;
}

.docutils.field-list td {
    padding: var(--space-md) var(--space-md) var(--space-md) var(--space-lg);
    text-align: left;
    vertical-align: top;
}

.docutils.field-list td blockquote p {
    font-size: 0.9rem;
    line-height: 1.5;
}

p.rubric {
    font-weight: 600;
    font-size: 1.2rem;
    margin: var(--space-lg) 0 var(--space-md) 0;
}

p.admonition-title {
    font-weight: 600;
    text-decoration: underline;
}

/* Example gallery */
.gallery {
    min-height: 200px;
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.figure {
    margin: var(--space-md);
    transition: transform var(--transition-base);
}

.figure:hover {
    transform: translateY(-4px);
}

.figure img {
    display: block;
    margin: 0 auto;
    max-height: 150px;
    max-width: 200px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

.figure:hover img {
    box-shadow: var(--shadow-md);
}

.figure .caption {
    width: 200px;
    text-align: center;
    margin-top: var(--space-sm);
    font-size: 0.9rem;
}

/* Labels and badges */
.docutils .label,
.docutils .badge {
    background: transparent;
    text-shadow: none;
    font-size: 0.9rem;
    padding: var(--space-xs) var(--space-sm);
    line-height: 1.5;
    color: var(--text-primary);
}

/* Responsive design */
@media (max-width: 991.98px) {
    .sidebar {
        position: static;
        max-height: none;
        margin-bottom: var(--space-xl);
    }

    .search-form {
        min-width: auto;
        width: 100%;
        margin-top: var(--space-md);
    }

    .gallery-random {
        float: none;
        display: block;
        margin: 0 auto var(--space-md);
        text-align: center;
    }

    .chatbutton {
        padding: var(--space-sm) var(--space-md);
    }

    .chatbutton a {
        font-size: 0.8rem;
    }
}

@media (max-width: 575.98px) {
    h1 {
        font-size: 1.6rem;
    }

    h2 {
        font-size: 1.4rem;
    }

    .logo img {
        height: 50px;
    }

    .logo-title {
        font-size: 1.5rem;
    }

    .logo-tagline {
        display: none;
    }

    .hero {
        padding: var(--space-md);
    }

    .chatbutton {
        right: 1em;
        left: 1em;
        text-align: center;
    }

    .footer {
        padding-bottom: 4rem;
    }
}

/* Print styles */
@media print {
    .navbar,
    .sidebar,
    .chatbutton,
    .footer {
        display: none;
    }

    main {
        width: 100%;
        max-width: 100%;
    }

    a {
        text-decoration: underline;
    }
}

/* Reduced motion support */
@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;
    }
}