:root {
    --color-primary: #1f2937;
    --color-secondary: #6b4f3b;
    --color-accent: #b91c1c;
    --color-light: #f3f4f6;
    --color-lighter: #f9fafb;
    --color-border: #d1d5db;
    --color-hover: #f3f4f6;
    --color-text: #111827;
    --color-text-light: #4b5563;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --transition: 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'IBM Plex Sans', 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--color-text);
    background: #f5f5f4;
    min-height: 100vh;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: var(--spacing-md);
}

/* Header */
header {
    background: white;
    padding: var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

header h1 {
    font-family: 'Source Serif 4', Georgia, 'Times New Roman', serif;
    font-size: 2.15rem;
    color: var(--color-primary);
    margin-bottom: 0.35rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.subtitle {
    font-size: 1rem;
    color: var(--color-text-light);
    max-width: 720px;
}

/* Filters */
.filters {
    background: white;
    padding: var(--spacing-md);
    border-radius: 4px;
    margin-bottom: var(--spacing-lg);
    border: 1px solid var(--color-border);
}

.filters h2 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

.ranking-source {
    margin: 0.35rem 0 0.35rem;
    font-size: 0.86rem;
    color: var(--color-text-light);
}

.ranking-source a {
    color: var(--color-secondary);
    text-decoration: none;
}

.ranking-source a:hover {
    text-decoration: underline;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.filter-btn {
    padding: 0.45rem 0.8rem;
    border: 1px solid var(--color-border);
    background: white;
    color: var(--color-text);
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition);
    white-space: nowrap;
}

.filter-btn:hover {
    border-color: var(--color-secondary);
    color: var(--color-secondary);
}

.filter-btn.active {
    background: #f3ece6;
    border-color: #d8c5b4;
    color: #5c4635;
}

/* Controls */
.controls-row {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: var(--spacing-md);
    align-items: end;
    margin-bottom: var(--spacing-lg);
}

.search-box {
    margin-bottom: 0;
    display: grid;
    align-items: center;
}

.sort-box {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.sort-box label {
    font-size: 0.88rem;
    color: var(--color-text-light);
}

.results-meta {
    margin: -0.75rem 0 1rem;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

#searchInput {
    grid-area: 1 / 1;
    width: 100%;
    padding: 12px 44px 12px 16px;
    font-size: 1rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: white;
    transition: all var(--transition);
}

.clear-search-btn {
    grid-area: 1 / 1;
    justify-self: end;
    margin-right: 10px;
    width: 28px;
    height: 28px;
    border: 1px solid transparent;
    border-radius: 50%;
    background: transparent;
    color: #6b7280;
    font-size: 1.2rem;
    line-height: 1;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color var(--transition), color var(--transition), border-color var(--transition);
}

.clear-search-btn:hover {
    background: #f3f4f6;
    color: #374151;
}

.clear-search-btn:focus-visible {
    outline: none;
    border-color: #b8aa9d;
    box-shadow: 0 0 0 2px rgba(184, 170, 157, 0.18);
}

.clear-search-btn[hidden] {
    display: none;
}

#sortSelect {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.95rem;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: white;
    color: var(--color-text);
}

#searchInput:focus {
    outline: none;
    border-color: #b8aa9d;
    box-shadow: 0 0 0 2px rgba(184, 170, 157, 0.18);
}

#sortSelect:focus {
    outline: none;
    border-color: #b8aa9d;
    box-shadow: 0 0 0 2px rgba(184, 170, 157, 0.18);
}

.expand-collapse-btn {
    padding: 12px 16px;
    background-color: white;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-family: "IBM Plex Sans", -apple-system, BlinkMacSystemFont, sans-serif;
    font-size: 0.95rem;
    cursor: pointer;
    color: var(--color-text);
    transition: all var(--transition);
    white-space: nowrap;
}

.expand-collapse-btn:hover {
    background-color: var(--color-hover);
    border-color: var(--color-secondary);
    color: var(--color-secondary);
}

.expand-collapse-btn:focus {
    outline: none;
    border-color: #b8aa9d;
    box-shadow: 0 0 0 2px rgba(184, 170, 157, 0.18);
}

/* Accordion */
.accordion-container {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.accordion-item {
    background: white;
    border-radius: 4px;
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.accordion-item:hover {
    border-color: #9ca3af;
}

.accordion-item.hidden {
    display: none;
}

/* Accordion Header */
.accordion-header {
    padding: 0;
    user-select: none;
}

.accordion-toggle {
    appearance: none;
    border: 0;
    background: transparent;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    cursor: pointer;
    text-align: left;
    display: grid;
    grid-template-columns: 1fr auto auto 60px;
    gap: var(--spacing-lg);
    align-items: center;
    transition: background var(--transition);
}

.accordion-toggle:hover {
    background: var(--color-hover);
}

.accordion-toggle:focus-visible {
    outline: 2px solid #8b5e3c;
    outline-offset: -2px;
}

.accordion-item.active .accordion-toggle {
    background: var(--color-lighter);
}

.conf-name {
    font-weight: 600;
    font-size: 1.02rem;
    color: var(--color-primary);
}

.conf-meta {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    min-width: 0;
}

.mini-core-badge {
    display: inline-block;
    padding: 0.16rem 0.45rem;
    border-radius: 3px;
    font-size: 0.72rem;
    font-weight: 600;
    color: #374151;
    background: #f3f4f6;
    border: 1px solid #d1d5db;
    white-space: nowrap;
}

.mini-core-badge.core-astar {
    color: #5b2c6f;
    background: #f4ecfb;
    border-color: #dcc9f0;
}

.mini-core-badge.core-a {
    color: #1e8449;
    background: #eaf7ef;
    border-color: #cfead8;
}

.mini-core-badge.core-b {
    color: #4b5563;
    background: #eef1f4;
    border-color: #d7dde3;
}

.mini-core-badge.core-c {
    color: #b9770e;
    background: #fdf3df;
    border-color: #f4e0b4;
}

.mini-core-badge.core-unranked {
    color: #566573;
    background: #f3f4f6;
    border-color: #d1d5db;
}

.ratio-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.ratio-badge {
    background: #f6f1eb;
    color: #5b4636;
    padding: 0.35rem 0.65rem;
    border: 1px solid #dccdbf;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.9rem;
}

.sparkline-container {
    width: 60px;
    height: 35px;
    background: #fafafa;
    border: 1px solid #e5e7eb;
    border-radius: 3px;
    padding: 4px;
}

.expand-icon {
    width: 24px;
    height: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #6b7280;
    font-size: 1.4rem;
    font-weight: 300;
    line-height: 1;
    transition: color var(--transition);
    user-select: none;
}

.expand-icon::after {
    content: '+';
}

.accordion-item.active .expand-icon::after {
    content: '−';
}

/* Accordion Details */
.accordion-details {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition), padding var(--transition);
}

.accordion-item.active .accordion-details {
    max-height: 1500px;
    padding: 0 var(--spacing-lg) var(--spacing-md);
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.details-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.detail-section h3 {
    font-size: 0.95rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.detail-section p {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: var(--spacing-sm);
}

.rank-tag {
    display: inline-block;
    padding: 0.3rem 0.7rem;
    background: var(--color-light);
    border-radius: 4px;
    font-size: 0.9rem;
    margin-right: var(--spacing-xs);
    color: var(--color-text-light);
}

.rank-tag.core-astar {
    color: #5b2c6f;
    background: rgba(142, 68, 173, 0.16);
}

.rank-tag.core-a {
    color: #1e8449;
    background: rgba(39, 174, 96, 0.14);
}

.rank-tag.core-b {
    color: #4b5563;
    background: #eef1f4;
}

.rank-tag.core-c {
    color: #b9770e;
    background: rgba(243, 156, 18, 0.18);
}

.rank-tag.core-unranked {
    color: #566573;
    background: rgba(149, 165, 166, 0.2);
}

/* Historical Data Table */
.history-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.95rem;
    margin-top: var(--spacing-md);
}

.history-table th {
    background: var(--color-lighter);
    padding: var(--spacing-sm);
    text-align: left;
    font-weight: 600;
    color: var(--color-primary);
    border-bottom: 2px solid var(--color-border);
}

.history-table td {
    padding: 0.75rem var(--spacing-sm);
    border-bottom: 1px solid var(--color-border);
}

.history-table tr:hover {
    background: var(--color-light);
}

.ratio-cell {
    font-weight: 600;
    color: #5b4636;
}

.history-title {
    margin: 1.5rem 0 1rem;
    font-size: 1rem;
    color: var(--color-primary);
}

/* Chart Container */
.chart-wrapper {
    position: relative;
    height: 300px;
    margin: var(--spacing-lg) 0;
    background: #fcfcfc;
    border: 1px solid #e5e7eb;
    padding: var(--spacing-md);
    border-radius: 4px;
}

/* Footer */
footer {
    text-align: left;
    margin-top: var(--spacing-xl);
    padding: var(--spacing-md);
    background: white;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    font-size: 0.9rem;
    color: var(--color-text-light);
}

footer p {
    margin: var(--spacing-sm) 0;
}

footer a {
    color: var(--color-secondary);
    text-decoration: none;
    transition: color var(--transition);
}

footer a:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

footer details {
    margin-top: var(--spacing-sm);
    text-align: left;
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-sm);
}

footer details summary {
    cursor: pointer;
    color: var(--color-secondary);
    font-weight: 500;
    list-style: none;
    text-align: left;
}

footer details summary::-webkit-details-marker { display: none; }

footer details summary::before {
    content: '▸ ';
    font-size: 0.8em;
}

footer details[open] summary::before {
    content: '▾ ';
}

footer details p {
    margin-top: var(--spacing-sm);
    font-size: 0.85rem;
    line-height: 1.6;
}

/* Responsive */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8rem;
    }

    .controls-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .subtitle {
        font-size: 1rem;
    }

    .accordion-toggle {
        grid-template-columns: 1fr auto;
        gap: var(--spacing-sm);
        padding: var(--spacing-md);
    }

    .conf-meta {
        flex-wrap: wrap;
        gap: 0.4rem;
    }

    .sparkline-container {
        display: none;
    }

    .details-grid {
        grid-template-columns: 1fr;
    }

    .filter-buttons {
        gap: var(--spacing-xs);
    }

    .filter-btn {
        padding: 0.5rem 1rem;
        font-size: 0.85rem;
    }

    .chart-wrapper {
        height: 250px;
    }

}

@media (max-width: 480px) {
    .container {
        padding: var(--spacing-sm);
    }

    header {
        padding: var(--spacing-lg) var(--spacing-sm);
    }

    header h1 {
        font-size: 1.5rem;
    }

    .accordion-toggle {
        grid-template-columns: 1fr;
        gap: var(--spacing-xs);
    }

    .mini-core-badge {
        font-size: 0.72rem;
    }

    .ratio-card {
        display: none;
    }

    #searchInput {
        padding: 10px 40px 10px 12px;
        font-size: 16px; /* Prevents zoom on iOS */
    }
}

@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    .accordion-details,
    .accordion-item,
    .accordion-toggle {
        transition: none;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.loading {
    text-align: center;
    padding: var(--spacing-xl);
    color: var(--color-text-light);
}

.error {
    background: #ffe6e6;
    border: 2px solid #c41e3a;
    color: #c41e3a;
    padding: var(--spacing-md);
    border-radius: 8px;
    margin: var(--spacing-lg) 0;
}