:root {
    /* Tokyo Night values for the colours that static/themes/*.css doesn't
       set. The theme file sets the rest. */
    --border-strong: #545c7e;
    --visited: #bb9af7;
    --hover: #7dcfff;
    --error: #f7768e;
    --error-hover: #9d7cd8;
}

*, *::before, *::after {
    box-sizing: border-box;
    border-radius: 0;
}

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: "Iosevka", "Roboto Mono", ui-monospace, monospace;
    font-size: 15px;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

img[src=""] {
    display: none;
}

a {
    color: var(--accent);
    text-decoration: none;
}
a:visited {
    color: var(--visited);
}
a:hover {
    color: var(--bg-main);
    background: var(--hover);
}
h1 a:hover,
.cached:hover,
.overlay-btn.secondary:hover,
.pagination-current:hover {
    color: var(--bg-main);
    border-color: var(--hover);
}

:focus-visible {
    outline: 2px solid var(--hover);
    outline-offset: 2px;
}

/* logo */

h1 {
    font-size: 1.3rem;
    font-weight: 700;
    margin: 0;
    white-space: nowrap;
}
h1 a,
h1 a:visited {
    color: var(--text-primary);
}
h1 span {
    color: var(--accent);
}
h1 a:hover span {
    color: inherit;
}

/* search input and buttons */

.search-box {
    width: 100%;
    padding: 10px 14px;
    border: 2px solid var(--border);
    background: var(--bg-card);
    color: var(--text-primary);
    font: inherit;
    outline: none;
    caret-shape: block;
    caret-color: var(--accent);
}
.search-box:focus {
    border-color: var(--accent);
}
.search-box::placeholder {
    color: var(--text-secondary);
}
.search-box:focus::placeholder {
    color: transparent;
}

button {
    font: inherit;
    padding: 8px 18px;
    cursor: pointer;
    border: 2px solid var(--accent);
    background: transparent;
    color: var(--accent);
    touch-action: manipulation;
}
button:hover {
    background: var(--hover);
    border-color: var(--hover);
    color: var(--bg-main);
}

/* home */

.view-home {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
}
.view-home .container {
    width: 100%;
    max-width: 600px;
    display: flex;
    flex-direction: column;
}
.view-home .hero-logo {
    font-size: 2.5rem;
    margin: 0 0 24px;
    text-align: center;
}
.view-home .search-input-wrapper {
    margin-bottom: 16px;
}
.view-home .search-box {
    font-size: 1.05rem;
    padding: 14px 16px;
}
.view-home .buttons {
    display: flex;
    gap: 12px;
    justify-content: center;
}
.view-home .btn-secondary {
    border-color: var(--border-strong);
    color: var(--text-secondary);
}

/* header and tabs */

header {
    display: flex;
    align-items: center;
    gap: 24px;
    padding: 16px 60px;
    border-bottom: 2px solid var(--border);
}
.search-form {
    flex-grow: 1;
    max-width: 640px;
}
.nav-tabs {
    padding: 0 60px;
    border-bottom: 2px solid var(--border);
}
.nav-container {
    display: flex;
    gap: 4px;
}
.nav-tabs a,
.nav-tabs a:visited {
    display: inline-block;
    padding: 10px 14px;
    color: var(--text-secondary);
}
.nav-tabs a:hover {
    color: var(--bg-main);
}
.nav-tabs a.active {
    color: var(--accent);
    box-shadow: inset 0 -2px 0 var(--accent);
}
.nav-tabs a.active::before {
    content: "> ";
}

/* results */

.content-layout {
    display: grid;
    grid-template-columns: 140px minmax(0, 700px) 420px;
    /* row 1 holds the AI answer when there is one; a sidebar taller than
       it grows row 2, so the organic results never move down. There's no
       row gap, so an empty row 1 adds no space when AI is off */
    grid-template-rows: auto 1fr;
    column-gap: 48px;
    padding: 28px 60px;
}
.results-container {
    grid-column: 2;
}
.infobox-sidebar {
    grid-column: 3;
    grid-row: 1 / span 2;
}

.engine-filter-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 24px;
}
.engine-filter,
.engine-filter:visited {
    border: 2px solid var(--border);
    color: var(--text-secondary);
    padding: 4px 10px;
    font-size: 0.85rem;
}
.engine-filter.active {
    border-color: var(--accent);
    color: var(--accent);
}
.engine-filter:hover {
    border-color: var(--hover);
    color: var(--bg-main);
}
.engine-filter.error:hover {
    border-color: var(--error-hover);
    background: var(--error-hover);
}

.engine-warning-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 24px;
}
.engine-warning {
    background: var(--bg-card);
    border: 2px solid var(--border);
    border-left-color: var(--error);
    padding: 12px 16px;
}
.engine-warning-title {
    display: block;
    margin-bottom: 4px;
}
.engine-warning-copy {
    color: var(--text-muted);
    line-height: 1.5;
    margin: 0;
}

.result {
    margin-bottom: 28px;
}
.result-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 2px;
    position: relative;
}
.result-favicon {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
    background-size: cover;
    background-position: center;
    position: absolute;
    left: -24px;
}
.url {
    color: var(--text-secondary);
    font-size: 0.8rem;
    display: block;
    margin-bottom: 4px;
    overflow-wrap: anywhere;
}
.result > a {
    font-size: 1.1rem;
    display: inline-block;
    margin-bottom: 4px;
}
.desc {
    color: var(--text-muted);
    line-height: 1.6;
    margin: 0;
}
.cached,
.cached:visited {
    color: var(--text-secondary);
    font-size: 0.8rem;
}
.cached::before {
    content: "> ";
}

/* infobox */

.infobox {
    background: var(--bg-card);
    border: 2px solid var(--border);
    margin-bottom: 12px;
}
.infobox-header {
    padding: 14px 18px;
    border-bottom: 2px solid var(--border);
}
.infobox-title {
    font-size: 1.1rem;
    margin: 0;
}
.infobox-title::before {
    content: "# ";
    color: var(--accent);
}
.infobox-main {
    display: flex;
    gap: 16px;
    padding: 18px;
}
.infobox-image {
    width: 110px;
    height: 110px;
    min-width: 110px;
    border: 2px solid var(--border);
    object-fit: cover;
}
.infobox-content {
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.infobox-summary {
    display: block;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-muted);
    margin: 0;
}
/* infobox HTML from the C code carries inline light-theme colours */
.infobox-main [style*="color"] {
    color: var(--text-secondary) !important;
}
.infobox-main [style*="border-top"] {
    border-top-color: var(--border) !important;
}
.read-more {
    font-size: 0.85rem;
    align-self: flex-start;
}
.read-more::before {
    content: "> ";
}

/* AI answer: a grid item of its own, so it sits above the organic results
   and the infoboxes in both the wide and the single-column layouts */

.ai-answer {
    grid-column: 2;
    margin-bottom: 24px;
}
.ai-answer-body {
    padding: 18px;
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-muted);
    overflow-wrap: anywhere;
}
.ai-answer-body > * {
    margin: 0 0 12px;
}
.ai-answer-body > :last-child {
    margin-bottom: 0;
}
.ai-muted,
.ai-footer {
    color: var(--text-secondary);
}
.ai-footer {
    font-size: 0.8rem;
}
.ai-cite {
    font-size: 0.85em;
    white-space: nowrap;
}
.ai-sources {
    list-style: none;
    padding: 12px 0 0;
    border-top: 2px solid var(--border);
    font-size: 0.8rem;
    line-height: 1.5;
}
.ai-source-domain {
    color: var(--text-secondary);
}
.ai-answer-body .math {
    overflow-x: auto;
    overflow-y: hidden;
    color: var(--text-primary);
}
.ai-answer-body pre {
    background: var(--bg-main);
    border: 2px solid var(--border);
    padding: 12px;
    overflow-x: auto;
    overflow-wrap: normal;
    font-family: inherit;
    font-size: 0.85rem;
    color: var(--text-primary);
}
/* code.hljs outranks the vendored theme's padding and background */
.ai-answer-body pre code,
.ai-answer-body pre code.hljs {
    font-family: inherit;
    background: transparent;
    padding: 0;
}

/* pagination */

.pagination {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-top: 40px;
    padding-bottom: 40px;
}
.pagination-btn,
.pagination-btn:visited {
    border: 2px solid var(--border);
    color: var(--text-secondary);
    padding: 4px 10px;
    font-size: 0.9rem;
    touch-action: manipulation;
}
.pagination-btn:hover {
    border-color: var(--hover);
    color: var(--bg-main);
}
.pagination-current,
.pagination-current:visited {
    border-color: var(--accent);
    color: var(--accent);
}

/* images */

.image-results-container {
    padding: 28px 60px;
}
.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 16px;
    max-width: 1600px;
    margin: 0 auto;
}
.image-card {
    background: var(--bg-card);
    border: 2px solid var(--border);
    overflow: hidden;
}
.image-card:hover,
.image-card:focus-within {
    border-color: var(--accent);
}
.image-wrapper {
    position: relative;
    aspect-ratio: 4/3;
    background: #16161e;
    overflow: hidden;
}
.image-wrapper img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}
.image-overlay {
    position: absolute;
    inset: 0;
    background: rgba(22, 22, 30, 0.75);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
}
.image-card:hover .image-overlay,
.image-card:focus-within .image-overlay {
    opacity: 1;
    pointer-events: auto;
}
.overlay-buttons {
    display: flex;
    flex-direction: column;
    gap: 8px;
    width: 70%;
}
.overlay-btn,
.overlay-btn:visited {
    padding: 6px 12px;
    font-size: 0.8rem;
    text-align: center;
    border: 2px solid var(--accent);
    background: var(--bg-main);
    color: var(--accent);
    touch-action: manipulation;
}
.overlay-btn.secondary,
.overlay-btn.secondary:visited {
    border-color: var(--border-strong);
    color: var(--text-primary);
}
.overlay-btn:hover {
    border-color: var(--hover);
    background: var(--hover);
    color: var(--bg-main);
}
.image-info {
    padding: 10px 12px;
}
.image-caption,
.image-source {
    display: block;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.image-caption {
    font-size: 0.85rem;
    margin-bottom: 4px;
}
.image-source {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* responsive */

@media (max-width: 1200px) {
    .content-layout {
        grid-template-columns: 1fr;
        grid-template-rows: none;
        padding: 20px 30px;
        gap: 20px;
    }
    .results-container,
    .infobox-sidebar,
    .ai-answer {
        grid-column: 1;
    }
    .infobox-sidebar {
        grid-row: auto;
        order: -1;
    }
    .ai-answer {
        order: -2;
        margin-bottom: 0;
    }
    .sidebar-spacer {
        display: none;
    }
    header {
        padding: 14px 30px;
    }
    .nav-tabs {
        padding: 0 30px;
    }
    .image-results-container {
        padding: 20px 30px;
    }
}

@media (max-width: 768px) {
    header {
        flex-direction: column;
        align-items: stretch;
        gap: 12px;
        padding: 12px 16px;
        text-align: center;
    }
    .search-form {
        max-width: 100%;
    }
    .nav-tabs {
        overflow-x: auto;
        padding: 0 16px;
    }
    .nav-container {
        min-width: max-content;
    }
    .content-layout {
        padding: 16px 16px 16px 40px;
    }
    .result > a {
        font-size: 1rem;
        overflow-wrap: anywhere;
    }
    .infobox-main {
        flex-direction: column;
    }
    .infobox-image {
        width: 100%;
        height: auto;
        min-width: unset;
        max-width: 200px;
    }
    .image-results-container {
        padding: 16px;
    }
    .view-home .hero-logo {
        font-size: 1.8rem;
    }
    button {
        padding: 12px 20px;
    }
}

@media (max-width: 600px) {
    .image-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 8px;
    }
    .overlay-buttons {
        width: 85%;
    }
}

.home-settings-btn {
    position: fixed;
    top: 27px;
    inset-inline-end: 60px;
    width: 24px;
    height: 24px;
    background-color: var(--text-primary);
    -webkit-mask-image: url("/static/settings.svg");
    mask-image: url("/static/settings.svg");
    mask-size: contain;
    mask-repeat: no-repeat;
    mask-position: center;
    text-decoration: none;
}

.home-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 8px 24px;
    font-size: 12px;
    color: var(--text-muted);
    text-align: center;
}

.version-link {
    color: var(--text-muted);
    text-decoration: underline;
}

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

.nav-settings-icon {
    width: 24px;
    height: 24px;
    flex-shrink: 0;
    margin-inline-start: auto;
    margin-top: 3px;
    background-color: var(--text-secondary);
    -webkit-mask-image: url("/static/settings.svg");
    mask-image: url("/static/settings.svg");
    mask-size: 100% 100%;
    transition: background-color 0.2s;
    text-decoration: none;
}

.nav-settings-icon:hover,
.nav-settings-icon.active {
    background-color: var(--text-primary);
}

/* .nav-tabs a sets display, so these need its specificity to hide the tab
   on desktop, where the header shows the settings icon instead. */
.nav-tabs a.nav-settings-link {
    display: none;
    margin-inline-start: auto;
}

.settings-layout {
    padding-block: 30px;
    padding-inline-start: 260px;
    padding-inline-end: 60px;
}

.settings-container {
    max-width: 700px;
}

.settings-section {
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 24px;
    margin-bottom: 32px;
}

.settings-section-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin: 0 0 4px 0;
}

.settings-section-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0 0 20px 0;
    line-height: 1.4;
}

.settings-field {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 0;
}

.settings-field + .settings-field {
    border-top: 1px solid var(--border);
}

.settings-label {
    font-size: 0.95rem;
    color: var(--text-primary);
}

.settings-select {
    padding: 8px 12px;
    border: 1px solid var(--border);
    background: var(--bg-main);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    outline: none;
    cursor: pointer;
    transition: border-color 0.2s;
}

.settings-select:focus {
    border-color: var(--accent);
}

.settings-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--accent);
    cursor: pointer;
}

.settings-actions {
    display: flex;
    gap: 12px;
    margin-top: 8px;
    padding-bottom: 40px;
    justify-content: flex-start;
}

.settings-actions .btn-primary {
    background: var(--accent);
    color: var(--bg-main);
    border: 1px solid transparent;
    padding: 10px 24px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    touch-action: manipulation;
}

.settings-actions .btn-primary:hover {
    filter: brightness(1.1);
}

.settings-actions .btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 10px 24px;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    touch-action: manipulation;
}

.settings-actions .btn-secondary:hover {
    background: var(--border);
    border-color: var(--text-secondary);
}

@media (max-width: 1200px) {
    .settings-layout {
        padding-block: 20px;
        padding-inline: 30px;
        display: flex;
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav-settings-icon {
        display: none;
    }
    .nav-tabs a.nav-settings-link {
        display: inline-block;
    }
    .settings-layout {
        padding: 12px;
        display: block;
    }
    .settings-container {
        max-width: 100%;
    }
    .settings-section {
        padding: 16px;
    }
    .settings-field {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
    }
    .settings-actions {
        flex-direction: column;
    }
    .settings-actions .btn-primary,
    .settings-actions .btn-secondary {
        width: 100%;
        text-align: center;
    }
}

[dir="rtl"] {
    direction: rtl;
    unicode-bidi: embed;
}

[dir="rtl"] header {
    flex-direction: row-reverse;
    direction: ltr;
}

[dir="rtl"] .nav-container {
    flex-direction: row-reverse;
    direction: ltr;
}

[dir="rtl"] .search-box {
    text-align: right;
    direction: rtl;
}

[dir="rtl"] .url {
    text-align: end;
}

[dir="rtl"] .nav-settings-icon {
    margin-inline-start: unset;
    margin-inline-end: auto;
}

[dir="rtl"] .settings-actions .btn-primary {
    margin-inline-end: auto;
}

[dir="rtl"] .pagination-btn.prev,
[dir="rtl"] .pagination-btn.next {
    transform: scaleX(-1);
}

@media (max-width: 768px) {
    [dir="rtl"] header {
        flex-direction: column;
    }
}