/* つくしサーチ (Tsukushi Search) — stylesheet
 * Design system mirrors https://codh.rois.ac.jp/tsukushi/books/ for visual
 * consistency across the tsukushi project. */

:root {
    /* Color palette — Edo period inspired */
    --color-primary: #8B4513;
    --color-primary-dark: #6B3410;
    --color-secondary: #D4A574;
    --color-accent: #B8860B;
    --color-accent-light: #FFE4B5;
    --color-text: #2C1810;
    --color-text-light: #5D4E37;
    --color-bg: #FDF8F0;
    --color-bg-alt: #F5EDE0;
    --color-bg-card: #FFFFFF;
    --color-border: #E8DFD0;
    --color-shadow: rgba(139, 69, 19, 0.15);
    --color-focus-ring: rgba(184, 134, 11, 0.3);
    --color-error: #b03030;

    /* Typography */
    --font-display: "Yuji Syuku", serif;
    --font-handwritten: "Zen Kurenaido", cursive;
    --font-main: "Noto Sans JP", sans-serif;

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

    /* Border radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.2s ease;
    --transition-slow: 0.3s ease;
}

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

html, body {
    font-size: 16px;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

body {
    font-family: var(--font-main);
    background-color: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

:focus { outline: none; }
:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}

/* Skip link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-primary);
    color: #fff;
    padding: var(--spacing-sm) var(--spacing-md);
    z-index: 100;
    text-decoration: none;
}
.skip-link:focus { top: 0; }

/* Header */
.site-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: #FDF8F0;
    padding: var(--spacing-lg) var(--spacing-lg) var(--spacing-md);
    text-align: center;
    box-shadow: 0 4px 20px var(--color-shadow);
}
.header-content { margin-bottom: var(--spacing-md); }
.site-title {
    font-family: var(--font-display);
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 400;
    letter-spacing: 0.05em;
    line-height: 1.2;
}
.site-title a {
    color: inherit;
    text-decoration: none;
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}
.title-sub {
    font-family: var(--font-main);
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 0.2em;
    opacity: 0.8;
}
.site-tagline {
    font-family: var(--font-handwritten);
    font-size: 1rem;
    margin-top: var(--spacing-xs);
    opacity: 0.9;
}

/* Main nav (emoji buttons) */
.main-nav {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}
.nav-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: var(--spacing-sm) var(--spacing-lg);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    color: inherit;
    cursor: pointer;
    transition: all var(--transition-normal);
    font-family: var(--font-main);
    font-size: 1rem;
    line-height: 1;
    text-decoration: none;
    min-width: 5rem;
}
.nav-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
}
.nav-btn.active {
    background: rgba(255, 255, 255, 0.95);
    color: var(--color-primary);
    border-color: transparent;
}
.nav-icon { font-size: 1.3rem; }

/* Main content */
.main-content {
    flex: 1;
    width: 100%;
    max-width: 960px;
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-lg);
}

.page-title {
    font-family: var(--font-display);
    font-size: clamp(1.4rem, 3vw, 1.9rem);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
    text-align: center;
}
.page-desc {
    text-align: center;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
}

/* Home hero */
.hero {
    text-align: center;
    padding: var(--spacing-xxl) var(--spacing-md) var(--spacing-xl);
}
.hero h2 {
    font-family: var(--font-display);
    font-size: clamp(1.6rem, 3.5vw, 2.1rem);
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
}
.hero .lede {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xl);
    font-size: 1rem;
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
    text-align: left;
}
.hero .lede a {
    color: var(--color-primary);
    text-decoration: none;
}
.hero .lede a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}
.hero .hint {
    margin-top: var(--spacing-md);
    color: var(--color-text-light);
    font-size: 0.9rem;
}

/* Search form */
.search-form, .search-bar form {
    display: flex;
    gap: var(--spacing-sm);
    max-width: 640px;
    margin: 0 auto;
}
.search-bar { margin-bottom: var(--spacing-xl); }
.search-bar form { max-width: none; }

.search-form input[type="text"],
.search-bar input[type="text"] {
    flex: 1;
    padding: 0.75rem 1rem;
    font-size: 1.05rem;
    font-family: var(--font-main);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-card);
    color: var(--color-text);
}
.search-form input:focus-visible,
.search-bar input:focus-visible {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-focus-ring);
}

.search-form button,
.search-bar button {
    padding: 0.75rem 1.4rem;
    font-size: 1rem;
    font-family: var(--font-main);
    border: none;
    border-radius: var(--radius-md);
    background: var(--color-primary);
    color: #fff;
    cursor: pointer;
    transition: background var(--transition-normal);
}
.search-form button:hover,
.search-bar button:hover { background: var(--color-primary-dark); }

/* Search examples (home page) */
.search-examples {
    max-width: 640px;
    margin: 0 auto;
    text-align: center;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-xl);
}
.search-examples h3 {
    font-family: var(--font-display);
    font-size: 1.1rem;
    color: var(--color-primary-dark);
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
}
.search-examples p { line-height: 2.2; }
.search-examples a {
    display: inline-block;
    padding: 0.25rem 0.7rem;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-primary);
    text-decoration: none;
    font-size: 0.95rem;
    transition: background var(--transition-fast), border-color var(--transition-fast);
}
.search-examples a:hover {
    background: var(--color-accent-light);
    border-color: var(--color-accent);
}
.search-examples .sep {
    color: var(--color-border);
    margin: 0 var(--spacing-xs);
}

/* About page step list */
.about-steps {
    margin: 0 0 var(--spacing-lg) var(--spacing-xl);
    padding-left: var(--spacing-md);
}
.about-steps li {
    margin-bottom: var(--spacing-sm);
    padding-left: var(--spacing-xs);
}
.about-steps li::marker { color: var(--color-accent); font-weight: 600; }

/* Result list */
.result-summary {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    text-align: center;
}
.result-summary strong {
    color: var(--color-primary-dark);
    font-weight: 600;
}

.result-list { list-style: none; }
.result-item {
    display: flex;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--color-shadow);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}
.result-item:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--color-shadow);
}

.result-meta {
    flex-shrink: 0;
    width: 4.5rem;
    text-align: center;
}
.score {
    display: inline-block;
    padding: 0.3rem 0.6rem;
    background: var(--color-accent-light);
    color: var(--color-primary-dark);
    border-radius: var(--radius-sm);
    font-family: "SF Mono", Menlo, Consolas, monospace;
    font-size: 0.85rem;
    font-weight: 600;
}

.result-body { flex: 1; min-width: 0; }
.result-title {
    font-family: var(--font-display);
    font-size: 1.15rem;
    margin-bottom: var(--spacing-xs);
    font-weight: 400;
}
.result-title a {
    color: var(--color-primary);
    text-decoration: none;
}
.result-title a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}
.result-content {
    color: var(--color-text);
    font-size: 0.95rem;
    white-space: pre-wrap;
    word-break: break-word;
}

/* Expandable full text — summary swaps between snippet and full text */
.result-content-toggle summary {
    list-style: none;
    cursor: pointer;
    color: var(--color-text);
    font-size: 0.95rem;
    word-break: break-word;
}
.result-content-toggle summary::-webkit-details-marker { display: none; }

.result-content-toggle .toggle-cue {
    color: var(--color-primary);
    font-size: 0.85rem;
    font-weight: 500;
    margin-left: 0.4em;
    white-space: nowrap;
}
.result-content-toggle:hover .toggle-cue { text-decoration: underline; }

/* Closed: show snippet + "more"; hide full + "less" */
.result-content-toggle:not([open]) .full,
.result-content-toggle:not([open]) .cue-less { display: none; }

/* Open: show full + "less"; hide snippet + "more" */
.result-content-toggle[open] .snippet,
.result-content-toggle[open] .cue-more { display: none; }

/* Empty / error */
.empty, .error {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-light);
}
.error { color: var(--color-error); }

/* About page */
.about-container {
    max-width: 720px;
    margin: 0 auto;
    background: var(--color-bg-card);
    padding: var(--spacing-xl) var(--spacing-xl);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: 0 2px 8px var(--color-shadow);
}
.about-container h2 {
    font-family: var(--font-display);
    color: var(--color-primary-dark);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    font-weight: 400;
}
.about-container h2:first-child { margin-top: 0; }
.about-container p { margin-bottom: var(--spacing-md); }
.about-container a {
    color: var(--color-primary);
    text-decoration: none;
}
.about-container a:hover {
    color: var(--color-primary-dark);
    text-decoration: underline;
}
.about-container ul {
    margin: 0 0 var(--spacing-md) var(--spacing-xl);
}
.about-container li { margin-bottom: var(--spacing-xs); }
.about-container code {
    background: var(--color-bg-alt);
    padding: 0.1em 0.35em;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
}

/* Footer */
.site-footer {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    color: var(--color-text-light);
    font-size: 0.85rem;
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    margin-top: var(--spacing-xxl);
}
.site-footer p { margin-bottom: var(--spacing-sm); }
.site-footer p:last-child { margin-bottom: 0; }
.site-footer a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 500;
}
.site-footer a:hover { text-decoration: underline; }

/* Mobile */
@media (max-width: 640px) {
    .site-header { padding: var(--spacing-md); }
    .nav-btn { padding: var(--spacing-sm) var(--spacing-md); min-width: 4rem; }
    .main-content { padding: var(--spacing-lg) var(--spacing-md); }
    .result-item { flex-direction: column; gap: var(--spacing-sm); }
    .result-meta { width: auto; text-align: left; }
    .about-container { padding: var(--spacing-lg); }
}