/* === Reset & Base === */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #21262d;
    --bg-card: #161b22;
    --bg-card-hover: #1c2128;
    --border-color: #30363d;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent-blue: #58a6ff;
    --accent-green: #3fb950;
    --accent-orange: #d29922;
    --accent-red: #f85149;
    --accent-purple: #bc8cff;
    --tag-bg: #1f6feb33;
    --tag-text: #58a6ff;
    --tag-border: #1f6feb;
    --func-bg: #23863633;
    --func-text: #3fb950;
    --func-border: #238636;
    --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    --radius: 6px;
    --radius-lg: 8px;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a.github-corner {
    position: fixed;
    top: 36px;
    right: -86px;
    z-index: 1200;
    background: var(--accent-blue);
    color: #0d1117;
    font-family: var(--font-mono);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    white-space: nowrap;
    width: 280px;
    padding: 8px 0;
    border: 1px solid rgba(255, 255, 255, 0.35);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.35);
    transform: rotate(45deg);
    transform-origin: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

a.github-corner:hover {
    text-decoration: none;
    filter: brightness(1.08);
}

a.github-corner svg {
    width: 14px;
    height: 14px;
    flex: 0 0 auto;
}

a.github-corner span {
    line-height: 1;
}

a {
    color: var(--accent-blue);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* === Header === */
.site-header {
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    padding: 48px 0 32px;
    text-align: center;
}

.site-header--detail {
    padding: 16px 0;
    text-align: left;
}

.site-header--detail .container {
    display: flex;
    align-items: center;
    gap: 24px;
}

.site-title {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--accent-blue);
    letter-spacing: -1px;
}

.site-header--detail .site-title {
    font-size: 1.4rem;
}

.site-title-badge {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 2px 8px;
    vertical-align: middle;
    letter-spacing: 0.05em;
}

.site-description {
    font-size: 0.95rem;
    color: var(--text-muted);
    margin-top: 12px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.site-tooling {
    font-size: 0.9rem;
    margin-top: 14px;
    color: var(--text-secondary);
}

.site-tooling a {
    font-weight: 600;
}

.back-link {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.back-link:hover {
    color: var(--accent-blue);
}

/* === Controls === */
.controls {
    margin-top: 32px;
    margin-bottom: 24px;
}

.search-box {
    margin-bottom: 20px;
}

.search-box input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.search-box input:focus {
    border-color: var(--accent-blue);
}

.search-box input::placeholder {
    color: var(--text-muted);
}

.filters {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.filter-group {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.filter-group label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    min-width: 80px;
    padding-top: 6px;
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.filter-btn {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    transition: all 0.15s ease;
    user-select: none;
}

.filter-btn:hover {
    border-color: var(--accent-blue);
    color: var(--text-primary);
}

.filter-btn.active {
    background: var(--tag-bg);
    border-color: var(--tag-border);
    color: var(--tag-text);
}

/* === Results === */
.results-info {
    margin-bottom: 16px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* === Technique Cards === */
.techniques-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 16px;
    margin-bottom: 48px;
}

.technique-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 20px;
    transition: all 0.2s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
    display: block;
}

.technique-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--accent-blue);
    text-decoration: none;
    transform: translateY(-1px);
}

.technique-card .card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 8px;
}

.technique-card .card-name {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
}

.technique-card .card-id {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--text-muted);
}

.technique-card .card-description {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    margin-bottom: 12px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.technique-card .card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.tag {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.7rem;
    font-weight: 500;
    background: var(--tag-bg);
    color: var(--tag-text);
    border: 1px solid var(--tag-border);
}

/* === Detail Page === */
.detail-page {
    padding-top: 32px;
    padding-bottom: 48px;
}

.technique-detail {
    max-width: 900px;
}

.technique-header {
    margin-bottom: 32px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.technique-name {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.technique-id {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 12px;
}

.technique-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 16px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.technique-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 8px;
}

.technique-section {
    margin-bottom: 28px;
}

.technique-section h2 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
    padding-bottom: 8px;
    border-bottom: 1px solid var(--border-color);
}

.section-content {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.section-content p {
    margin-bottom: 12px;
}

.section-content p:last-child {
    margin-bottom: 0;
}

.section-content ul,
.section-content ol {
    padding-left: 20px;
    margin: 8px 0;
}

.section-content li {
    margin-bottom: 2px;
}

.section-content li+li {
    margin-top: 0;
}

.section-content code {
    font-family: var(--font-mono);
    background: var(--bg-tertiary);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.85em;
}

.section-content pre {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 16px;
    overflow-x: auto;
    margin: 12px 0;
}

.section-content pre code {
    background: none;
    padding: 0;
    border-radius: 0;
    font-size: 0.85rem;
    line-height: 1.5;
    color: var(--text-primary);
}

/* Examples */
.examples-list {
    list-style: none;
    padding: 0;
}

.examples-list li {
    padding: 12px 16px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 8px;
}

.examples-list .example-name {
    font-weight: 600;
    color: var(--text-primary);
}

.examples-list .example-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-left: 8px;
}

.examples-list .example-ref {
    display: block;
    font-size: 0.8rem;
    margin-top: 4px;
    word-break: break-all;
}

/* References */
.references-list {
    list-style: none;
    padding: 0;
}

.references-list li {
    padding: 8px 0;
    border-bottom: 1px solid var(--border-color);
}

.references-list li:last-child {
    border-bottom: none;
}

.references-list .ref-description {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 2px;
}

/* === Modal === */
.modal-overlay {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    z-index: 1000;
    overflow-y: auto;
    padding: 40px 24px;
    backdrop-filter: blur(4px);
}

.modal-overlay.active {
    display: flex;
    justify-content: center;
    align-items: flex-start;
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    max-width: 900px;
    width: 100%;
    position: relative;
    padding: 32px;
    margin: 0 auto;
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 1.8rem;
    cursor: pointer;
    line-height: 1;
    padding: 4px 8px;
    border-radius: var(--radius);
    transition: color 0.15s, background 0.15s;
}

.modal-close:hover {
    color: var(--text-primary);
    background: var(--bg-tertiary);
}

body.modal-open {
    overflow: hidden;
}

/* === Footer === */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    text-align: center;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.site-footer p+p {
    margin-top: 4px;
}

/* === Responsive === */
@media (max-width: 768px) {
    a.github-corner {
        top: 28px;
        right: -82px;
        width: 240px;
        font-size: 0.62rem;
        padding: 7px 0;
        gap: 6px;
    }

    a.github-corner svg {
        width: 12px;
        height: 12px;
    }

    .site-title {
        font-size: 2rem;
    }

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

    .filter-group {
        flex-direction: column;
        gap: 6px;
    }

    .filter-group label {
        min-width: auto;
    }

    .technique-name {
        font-size: 1.5rem;
    }

    .technique-meta {
        flex-direction: column;
        gap: 4px;
    }
}

/* === Hidden utility === */
.hidden {
    display: none !important;
}