:root {
    --color-bg: #ffffff;
    --color-bg-soft: #f8f9fa;
    --color-bg-muted: #f2f2f2;
    --color-bg-code: #fafafa;
    --color-border: #dfe1e5;
    --color-border-muted: #e8e8e8;
    --color-border-soft: #f0f0f0;
    --color-text: #202124;
    --color-text-soft: #333333;
    --color-text-muted: #5f6368;
    --color-text-faint: #70757a;
    --color-link: #1a0dab;
    --color-link-visited: #681da8;
    --color-link-hover: #1a73e8;
    --color-cite: #006621;
    --color-error: #b71c1c;
    --color-deep-bg: #fffdf3;
    --color-deep-border: #e7d27a;
    --color-deep-accent: #c9a227;
    --color-deep-accent-soft: #8a6f1c;
    --color-deep-code: #f3ecc8;
    --color-deep-text: #5f4a13;
    --color-ai-bg: #f8f9ff;
    --color-ai-border: #d0d8f0;
    --color-ai-error-bg: #fff8f8;
    --color-ai-error-border: #f0d0d0;
    --shadow-sm: 0 1px 6px rgba(32, 33, 36, 0.1);
    --shadow-md: 0 1px 6px rgba(32, 33, 36, 0.28);
    --shadow-focus: 0 1px 6px rgba(66, 133, 244, 0.3);
    --shadow-deep: 0 1px 6px rgba(201, 162, 39, 0.35);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-pill: 24px;
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 20px;
    --space-2xl: 28px;
    --tap-target: 44px;
    --container-narrow: 584px;
    --container-results: 692px;
    --container-docs: 720px;
    --font-stack: arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

@media (prefers-color-scheme: dark) {
    :root {
        --color-bg: #1f2024;
        --color-bg-soft: #2a2c33;
        --color-bg-muted: #2a2c33;
        --color-bg-code: #24262d;
        --color-border: #3a3d45;
        --color-border-muted: #2f3239;
        --color-border-soft: #2a2c33;
        --color-text: #e8eaed;
        --color-text-soft: #d2d4d9;
        --color-text-muted: #a1a4ad;
        --color-text-faint: #888c95;
        --color-link: #8ab4f8;
        --color-link-visited: #c58af9;
        --color-link-hover: #aecbfa;
        --color-cite: #81c995;
        --color-error: #f28b82;
        --color-deep-bg: #2c2716;
        --color-deep-border: #6a5a26;
        --color-deep-accent: #ffd866;
        --color-deep-accent-soft: #d4b35c;
        --color-deep-code: #3b3522;
        --color-deep-text: #f4d989;
        --color-ai-bg: #1f2233;
        --color-ai-border: #3a4366;
        --color-ai-error-bg: #2a1c1c;
        --color-ai-error-border: #5a2929;
        --shadow-sm: 0 1px 6px rgba(0, 0, 0, 0.6);
        --shadow-md: 0 1px 6px rgba(0, 0, 0, 0.8);
        --shadow-focus: 0 1px 6px rgba(138, 180, 248, 0.4);
        --shadow-deep: 0 1px 6px rgba(255, 216, 102, 0.35);
    }
}

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

html { font-size: 100%; }

body {
    font-family: var(--font-stack);
    background: var(--color-bg);
    color: var(--color-text-soft);
    font-size: 1rem;
    line-height: 1.5;
    -webkit-text-size-adjust: 100%;
}

a { text-decoration: none; color: var(--color-link); }
a:hover { text-decoration: underline; }
a:focus-visible { outline: 2px solid var(--color-link-hover); outline-offset: 2px; border-radius: 2px; }

.is-hidden { display: none !important; }
.text-center { text-align: center; }
.muted-small { font-size: 0.75rem; color: var(--color-text-muted); }
.break-all { word-break: break-all; }

.landing {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--space-xl);
}
.landing .logo {
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 400;
    color: var(--color-text-soft);
    margin-bottom: var(--space-2xl);
    letter-spacing: -2px;
}

.search-form {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%;
    max-width: var(--container-narrow);
    margin: 0 auto;
}

.search-bar {
    display: flex;
    width: 100%;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-pill);
    padding: 0;
    overflow: hidden;
    background: var(--color-bg);
    box-shadow: var(--shadow-sm);
    transition: box-shadow 0.2s, border-color 0.2s;
}
.search-bar:hover { box-shadow: var(--shadow-md); }
.search-bar:focus-within {
    box-shadow: var(--shadow-focus);
    border-color: var(--color-link-hover);
}
.search-bar input[type="text"],
.search-bar input[type="search"] {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1rem;
    padding: var(--space-md) var(--space-lg);
    background: transparent;
    color: var(--color-text);
    min-height: var(--tap-target);
}
.search-bar button {
    border: none;
    background: var(--color-bg-soft);
    color: var(--color-text-soft);
    font-size: 0.875rem;
    padding: 0 var(--space-xl);
    min-height: var(--tap-target);
    cursor: pointer;
    border-left: 1px solid var(--color-border);
    transition: background 0.15s;
}
.search-bar button:hover { background: var(--color-border-muted); }

.search-options {
    margin-top: var(--space-md);
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-lg);
}
.search-options label {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    cursor: pointer;
    user-select: none;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 32px;
}
.search-options input[type="checkbox"] { cursor: pointer; width: 16px; height: 16px; }

.results-page { padding: var(--space-xl) 0; }
.results-header {
    background: var(--color-bg-muted);
    border-bottom: 1px solid var(--color-border-muted);
    padding: var(--space-md) var(--space-xl);
    position: sticky;
    top: 0;
    z-index: 10;
}
.results-header .search-bar {
    max-width: var(--container-results);
    margin: 0 auto;
    box-shadow: none;
    border: 1px solid var(--color-border);
}
.results-header .search-options { margin-top: var(--space-sm); }
.results-body {
    max-width: var(--container-results);
    margin: 0 auto;
    padding: var(--space-xl);
}
.results-stats {
    color: var(--color-text-faint);
    font-size: 0.8125rem;
    margin-bottom: var(--space-xl);
}

.result-item { margin-bottom: var(--space-2xl); }
.result-item h3 { font-size: 1.25rem; font-weight: normal; line-height: 1.3; }
.result-item h3 a { color: var(--color-link); }
.result-item h3 a:visited { color: var(--color-link-visited); }
.result-item cite {
    display: block;
    font-size: 0.875rem;
    color: var(--color-cite);
    font-style: normal;
    line-height: 1.3;
    margin: 2px 0 var(--space-xs);
    word-break: break-all;
}
.result-item .description {
    font-size: 0.875rem;
    color: var(--color-text-soft);
    line-height: 1.58;
}

.content-section { margin-top: 6px; }
.content-section--expanded .content-preview { display: none; }
.content-section--expanded .content-full { display: block; }
.content-preview {
    max-height: 4.5em;
    overflow: hidden;
    position: relative;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    background: var(--color-bg-code);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    font-family: var(--font-mono);
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
}
.content-preview::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 1.5em;
    background: linear-gradient(transparent, var(--color-bg-code));
}
.content-full {
    display: none;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    background: var(--color-bg-code);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-sm);
    padding: var(--space-sm);
    font-family: var(--font-mono);
    line-height: 1.5;
    white-space: pre-wrap;
    word-break: break-word;
    max-height: 400px;
    overflow-y: auto;
}
.content-toggle {
    font-size: 0.8125rem;
    color: var(--color-link);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-sm) 0;
    min-height: var(--tap-target);
    text-align: left;
}
.content-toggle:hover { text-decoration: underline; }
.content-failed {
    font-size: 0.75rem;
    color: var(--color-error);
    font-style: italic;
    margin-top: var(--space-xs);
}

.result-images {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-top: var(--space-sm);
}
.result-images img {
    width: 100%;
    max-width: 160px;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border-muted);
    background: var(--color-bg-soft);
}

.page-footer {
    max-width: var(--container-results);
    margin: var(--space-xl) auto 0;
    padding: var(--space-xl);
    border-top: 1px solid var(--color-border-muted);
    color: var(--color-text-faint);
    font-size: 0.75rem;
    line-height: 1.8;
}

.error-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: var(--space-xl);
    text-align: center;
}
.error-page .logo {
    font-size: clamp(2rem, 6vw, 3rem);
    font-weight: 400;
    color: var(--color-text-soft);
    margin-bottom: var(--space-xl);
    letter-spacing: -1px;
}
.error-message {
    font-size: 1.125rem;
    color: var(--color-error);
    margin: var(--space-xl) 0;
    max-width: 500px;
    line-height: 1.6;
}
.error-details {
    font-size: 0.875rem;
    color: var(--color-text-faint);
    margin-bottom: var(--space-2xl);
}

.search-bar--ai { flex-direction: column; border-radius: var(--radius-lg); }
.search-bar--ai button {
    border-left: none;
    border-top: 1px solid var(--color-border);
    padding: 10px var(--space-xl);
    width: 100%;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}
.search-bar textarea {
    flex: 1;
    border: none;
    outline: none;
    font-size: 1rem;
    padding: var(--space-md) var(--space-lg);
    background: transparent;
    min-height: 100px;
    resize: vertical;
    font-family: var(--font-stack);
    line-height: 1.5;
    width: 100%;
    color: var(--color-text);
}

.ai-response {
    background: var(--color-ai-bg);
    border: 1px solid var(--color-ai-border);
    border-radius: var(--radius-md);
    padding: var(--space-lg) var(--space-xl);
    margin-bottom: var(--space-2xl);
}
.ai-response-header {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.ai-response-body {
    font-size: 0.875rem;
    color: var(--color-text);
    line-height: 1.7;
    white-space: pre-wrap;
    word-break: break-word;
}
.ai-error { background: var(--color-ai-error-bg); border-color: var(--color-ai-error-border); }
.ai-error .ai-response-body { color: var(--color-error); }

.search-bar--deep {
    border-color: var(--color-deep-accent);
    background: var(--color-deep-bg);
}
.search-bar--deep:focus-within {
    box-shadow: var(--shadow-deep);
    border-color: var(--color-deep-accent);
}

.deep-response {
    background: var(--color-deep-bg);
    border: 1px solid var(--color-deep-border);
}
.deep-response .ai-response-body { white-space: normal; }
.deep-response .ai-response-body h1,
.deep-response .ai-response-body h2,
.deep-response .ai-response-body h3 {
    margin: 18px 0 var(--space-sm);
    color: var(--color-text);
    line-height: 1.3;
}
.deep-response .ai-response-body h1 { font-size: 1.25rem; }
.deep-response .ai-response-body h2 {
    font-size: 1.0625rem;
    border-bottom: 1px solid var(--color-deep-border);
    padding-bottom: var(--space-xs);
}
.deep-response .ai-response-body h3 { font-size: 0.9375rem; }
.deep-response .ai-response-body p { margin: var(--space-sm) 0; }
.deep-response .ai-response-body ul,
.deep-response .ai-response-body ol { margin: var(--space-sm) 0 var(--space-sm) 24px; padding: 0; }
.deep-response .ai-response-body li { margin: var(--space-xs) 0; }
.deep-response .ai-response-body a { color: var(--color-link); text-decoration: none; }
.deep-response .ai-response-body a:hover { text-decoration: underline; }
.deep-response .ai-response-body code {
    background: var(--color-deep-code);
    padding: 1px 5px;
    border-radius: 3px;
    font-size: 0.8125rem;
    font-family: var(--font-mono);
}
.deep-response .ai-response-body pre {
    background: var(--color-deep-code);
    padding: 10px var(--space-md);
    border-radius: var(--radius-sm);
    overflow-x: auto;
}
.deep-response .deep-model {
    font-weight: normal;
    text-transform: none;
    letter-spacing: 0;
    color: var(--color-deep-accent-soft);
    font-size: 0.6875rem;
}

.cite {
    color: var(--color-link);
    font-size: 0.82em;
    vertical-align: super;
    line-height: 0;
    padding: 0 1px;
}

.deep-sources { margin: var(--space-md) 0 var(--space-2xl); }
.deep-sources-header {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-sm);
}
.deep-sources .table-scroll {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}
.deep-sources table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
    background: var(--color-bg);
    border: 1px solid var(--color-deep-border);
    border-radius: 6px;
    overflow: hidden;
}
.deep-sources th {
    text-align: left;
    padding: var(--space-sm) 10px;
    background: var(--color-deep-bg);
    color: var(--color-text-muted);
    font-weight: 600;
    border-bottom: 1px solid var(--color-deep-border);
}
.deep-sources td {
    padding: var(--space-sm) 10px;
    border-bottom: 1px solid var(--color-deep-code);
    vertical-align: top;
}
.deep-sources tr:last-child td { border-bottom: none; }
.deep-sources .deep-src-idx { color: var(--color-deep-accent-soft); font-weight: 600; white-space: nowrap; }
.deep-sources .deep-src-url { color: var(--color-text-muted); font-size: 0.6875rem; word-break: break-all; }
.deep-sources .deep-src-grade { white-space: nowrap; font-weight: 600; color: var(--color-text); }
.deep-sources .deep-src-grade-detail { color: var(--color-deep-accent-soft); font-weight: normal; font-size: 0.6875rem; }

.deep-queries {
    margin: var(--space-sm) 0 var(--space-lg);
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-items: center;
}
.deep-queries-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-right: var(--space-xs);
}
.deep-query-chip {
    display: inline-block;
    padding: 3px 9px;
    background: var(--color-deep-bg);
    border: 1px solid var(--color-deep-border);
    border-radius: 12px;
    font-size: 0.75rem;
    color: var(--color-deep-text);
}

.deep-loading {
    position: fixed;
    inset: 0;
    background: rgba(255, 253, 243, 0.92);
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}
@media (prefers-color-scheme: dark) {
    .deep-loading { background: rgba(20, 18, 8, 0.92); }
}
.deep-loading-card {
    background: var(--color-bg);
    border: 1px solid var(--color-deep-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl) 32px;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 6px 24px rgba(0, 0, 0, 0.12);
    text-align: center;
}
.deep-loading-title {
    font-size: 1.25rem;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    font-weight: 600;
}
.deep-loading-text {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}
.deep-loading-dots {
    margin-top: var(--space-lg);
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
}
.deep-loading-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-deep-accent);
    animation: deep-bounce 1.4s infinite ease-in-out both;
}
.deep-loading-dots span:nth-child(1) { animation-delay: -0.32s; }
.deep-loading-dots span:nth-child(2) { animation-delay: -0.16s; }
@keyframes deep-bounce {
    0%, 80%, 100% { transform: scale(0.4); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

.docs {
    max-width: var(--container-docs);
    margin: 0 auto;
    line-height: 1.8;
    font-size: 0.875rem;
    color: var(--color-text-soft);
}
.docs h2 {
    font-size: 1.25rem;
    margin: 24px 0 var(--space-md);
    color: var(--color-text);
    font-weight: 400;
}
.docs h3 {
    font-size: 1rem;
    margin: var(--space-lg) 0 var(--space-sm);
    color: var(--color-text-soft);
    font-weight: 600;
}
.docs p { margin-bottom: var(--space-md); }
.docs code {
    background: var(--color-bg-muted);
    padding: 2px 5px;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
}
.docs ul { margin: var(--space-sm) 0 var(--space-sm) 24px; padding: 0; }
.docs li { margin: var(--space-xs) 0; }
.docs li.docs-li-plain { list-style: none; margin-left: var(--space-lg); }
.docs .table-scroll { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.docs table {
    width: 100%;
    border-collapse: collapse;
    margin: var(--space-md) 0;
    font-size: 0.8125rem;
}
.docs th {
    text-align: left;
    padding: var(--space-sm);
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border-muted);
    font-weight: 600;
}
.docs td {
    padding: var(--space-sm);
    border-bottom: 1px solid var(--color-border-soft);
    vertical-align: top;
}
.docs td a { word-break: break-all; }
.docs pre {
    background: var(--color-bg-soft);
    border: 1px solid var(--color-border-muted);
    border-radius: var(--radius-sm);
    padding: var(--space-md);
    font-size: 0.75rem;
    overflow-x: auto;
    line-height: 1.5;
}
.docs-header { text-align: center; }
.docs-header a {
    font-size: 1.75rem;
    color: var(--color-text-soft);
    text-decoration: none;
    font-weight: 400;
    letter-spacing: -1px;
}

.search-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-lg);
    margin-bottom: 10px;
    padding: 0 var(--space-xs);
    width: 100%;
    max-width: var(--container-narrow);
}
.search-tabs a {
    color: var(--color-text-muted);
    text-decoration: none;
    padding: var(--space-sm) var(--space-xs);
    font-size: 0.875rem;
    border-bottom: 2px solid transparent;
    min-height: var(--tap-target);
    display: inline-flex;
    align-items: center;
}
.search-tabs a:hover { color: var(--color-link-hover); text-decoration: none; }
.search-tabs a.active {
    color: var(--color-link-hover);
    border-bottom-color: var(--color-link-hover);
    font-weight: 500;
}
.results-header .search-tabs { max-width: var(--container-results); margin-bottom: 6px; }

.image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--space-sm);
    margin-top: var(--space-md);
}
.image-tile {
    position: relative;
    display: block;
    overflow: hidden;
    aspect-ratio: 1 / 1;
    background: var(--color-bg-muted);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border-muted);
    text-decoration: none;
}
.image-tile:hover {
    border-color: var(--color-link-hover);
    box-shadow: 0 1px 6px rgba(32, 33, 36, 0.18);
}
.image-tile img { width: 100%; height: 100%; object-fit: cover; display: block; }
.image-tile .image-meta {
    position: absolute;
    bottom: var(--space-xs);
    left: var(--space-xs);
    background: rgba(0, 0, 0, 0.6);
    color: #fff;
    font-size: 0.6875rem;
    padding: 1px 5px;
    border-radius: 2px;
}
.image-tile .image-attr {
    position: absolute;
    top: var(--space-xs);
    right: var(--space-xs);
    font-size: 0.625rem;
    background: rgba(255, 255, 255, 0.9);
    color: var(--color-text-soft);
    padding: 1px 5px;
    border-radius: 2px;
    max-width: 70%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.image-tile .image-attr a { color: var(--color-link-hover); }

@media (min-width: 601px) {
    .image-grid { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
}

@media (max-width: 600px) {
    .results-page { padding: var(--space-md) 0; }
    .results-header { padding: var(--space-sm) var(--space-md); }
    .results-body { padding: var(--space-md); }
    .page-footer { padding: var(--space-md); }
    .result-item { margin-bottom: var(--space-xl); }
    .result-images img { max-width: 110px; }
    .deep-sources table { font-size: 0.75rem; }
    .deep-sources th,
    .deep-sources td { padding: 6px 8px; }
}

@media (min-width: 1024px) {
    .results-body { padding: var(--space-xl) 0; }
}