body {
    --lab-success: #14733b;
    --lab-warning: #8a4b00;
    --lab-danger: #b42318;
    display: flex;
    min-height: 100dvh;
    flex-direction: column;
    background: var(--bg-light);
    color: var(--text);
}

main { flex: 1; }
p { margin: 0; }

.container {
    width: 100%;
    max-width: var(--content-wide);
    margin-inline: auto;
    padding-inline: var(--page-gutter);
}

header.nav { padding: 0; }

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.brand-link {
    color: var(--text);
    font-size: var(--text-caption);
    font-weight: 600;
    letter-spacing: -0.01em;
    text-decoration: none;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: clamp(14px, 2.5vw, 28px);
    height: 100%;
}

.nav-link {
    color: var(--text-secondary);
    font-size: var(--text-caption);
    line-height: 48px;
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-apple);
}

.nav-link:hover { color: var(--link); }

section { padding-block: clamp(64px, 9vw, 96px); }

section.hero {
    padding-block: clamp(80px, 12vw, 120px);
    background: var(--bg-alt);
    text-align: center;
}

.hero-inner {
    max-width: var(--content-max);
    margin-inline: auto;
}

.hero-eyebrow {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 18px;
    color: var(--text-secondary);
    font-size: var(--text-caption);
    font-weight: 600;
}

.hero h1 {
    margin: 0;
    color: var(--text);
    font: 600 var(--text-h2) / 1.08 var(--font-display);
    letter-spacing: var(--tracking-hero);
}

.hero-desc {
    max-width: 660px;
    margin: 22px auto 0;
    color: var(--text-secondary);
    font-size: var(--text-body);
    line-height: 1.8;
    text-wrap: pretty;
}

.status-badge {
    display: inline-flex;
    flex: 0 0 auto;
    align-items: center;
    gap: 6px;
    min-height: 28px;
    padding: 4px 9px;
    border: 1px solid currentColor;
    border-radius: var(--radius-pill);
    font-size: var(--text-caption);
    font-weight: 600;
    line-height: 1;
    white-space: nowrap;
}

.status-badge::before {
    width: 7px;
    height: 7px;
    flex: 0 0 auto;
    border-radius: 50%;
    background: currentColor;
    content: "";
}

.status-running { color: var(--lab-warning); background: #fff8e8; }
.status-done { color: var(--lab-success); background: #eef8f1; }
.status-draft, .status-archived { color: var(--text-secondary); background: var(--bg-alt); }

.experiments-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.exp-card {
    display: flex;
    min-height: 100%;
    flex-direction: column;
    gap: 14px;
    padding: clamp(22px, 3vw, 30px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    background: var(--bg-light);
    color: inherit;
    text-decoration: none;
    box-shadow: var(--shadow-card);
    transition:
        border-color var(--duration-base) var(--ease-apple),
        box-shadow var(--duration-base) var(--ease-apple),
        transform var(--duration-base) var(--ease-apple);
}

.exp-card:hover {
    border-color: var(--border-strong);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.exp-card-head {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 16px;
}

.exp-card-title {
    margin: 0;
    color: var(--text);
    font: 600 var(--text-h3) / 1.3 var(--font-display);
    letter-spacing: -0.015em;
}

.exp-card-date {
    color: var(--text-tertiary);
    font-size: var(--text-caption);
}

.exp-card-summary {
    flex: 1;
    color: var(--text-secondary);
    font-size: var(--text-caption);
    line-height: 1.75;
}

.exp-card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.exp-tag {
    padding: 4px 10px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    background: var(--bg-alt);
    color: var(--text-secondary);
    font-size: var(--text-caption);
}

.empty-state {
    padding: clamp(48px, 8vw, 88px) 24px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    background: var(--bg-alt);
    color: var(--text-secondary);
    text-align: center;
}

.empty-state p + p { margin-top: 8px; }

footer {
    border-top: 1px solid var(--border-subtle);
    background: var(--bg-light);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 96px;
    color: var(--text-secondary);
    font-size: var(--text-caption);
}

.footer-inner .nav-link { line-height: 1.5; }

/* Experiment review */
.exp-header {
    margin-bottom: 40px;
    padding: clamp(24px, 4vw, 36px);
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    background: var(--bg-alt);
}

.exp-title-row {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 20px;
}

.exp-title {
    margin: 0;
    color: var(--text);
    font: 600 var(--text-h2) / 1.08 var(--font-display);
    letter-spacing: var(--tracking-hero);
}

.exp-meta-grid {
    display: grid;
    grid-template-columns: max-content minmax(0, 1fr);
    gap: 9px 18px;
    margin: 24px 0 0;
    font-size: var(--text-caption);
}

.exp-meta-grid dt {
    color: var(--text-secondary);
    font-weight: 600;
}

.exp-meta-grid dd {
    margin: 0;
    color: var(--text);
}

.exp-conclusion {
    margin-top: 24px;
    padding: 18px 20px;
    border-left: 3px solid var(--lab-success);
    border-radius: 0 14px 14px 0;
    background: #eef8f1;
    color: var(--text);
    font-size: var(--text-caption);
    line-height: 1.7;
}

.exp-conclusion.pending {
    border-left-color: var(--lab-warning);
    background: #fff8e8;
}

.exp-links {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 20px;
}

.exp-link, .ab-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    min-height: 42px;
    padding: 10px 16px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    background: var(--bg-light);
    color: var(--link);
    font-size: var(--text-caption);
    text-decoration: none;
    cursor: pointer;
    transition:
        color var(--duration-fast) var(--ease-apple),
        border-color var(--duration-fast) var(--ease-apple),
        background-color var(--duration-fast) var(--ease-apple);
}

.exp-link:hover, .ab-btn:hover {
    border-color: rgba(0, 102, 204, 0.48);
    color: var(--link);
}

.round {
    padding-block: 40px;
    border-top: 1px solid var(--border-subtle);
}

.round:first-of-type {
    padding-top: 8px;
    border-top: 0;
}

.round-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 14px;
}

.round-num {
    color: var(--text);
    font: 600 1.3125rem / 1.3 var(--font-display);
}

.round-hypothesis, .round-judgment {
    margin: 0 0 14px;
    color: var(--text-secondary);
    font-size: var(--text-caption);
    line-height: 1.75;
}

.round-judgment {
    padding-left: 14px;
    border-left: 3px solid var(--text-tertiary);
}

.ab-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
    margin-top: 24px;
}

.ab-col {
    min-width: 0;
    padding: 22px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    background: var(--bg-light);
    box-shadow: var(--shadow-card);
}

.ab-col.winner {
    border-color: rgba(20, 115, 59, 0.48);
    box-shadow: 0 0 0 1px rgba(20, 115, 59, 0.12);
}

.ab-col-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 14px;
}

.ab-tag {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    min-height: 26px;
    padding: 4px 9px;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-pill);
    background: var(--bg-alt);
    color: var(--text-secondary);
    font-size: var(--text-caption);
    font-weight: 600;
    line-height: 1;
}

.ab-tag.tag-b { color: var(--link); }
.ab-tag.winner-tag { color: var(--lab-success); background: #eef8f1; }

.ab-label {
    margin: 0 0 12px;
    color: var(--text);
    font: 600 1rem / 1.4 var(--font-display);
}

.ab-metrics {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 14px;
    margin-bottom: 16px;
}

.ab-metric {
    color: var(--text-secondary);
    font-size: var(--text-caption);
}

.ab-metric strong {
    color: var(--text);
    font-weight: 600;
}

.ab-metric.error-zero strong { color: var(--lab-success); }
.ab-metric.error-nonzero strong { color: var(--lab-danger); }

.shot-scroller {
    display: flex;
    gap: 10px;
    padding-bottom: 8px;
    overflow-x: auto;
    scrollbar-color: var(--border-strong) transparent;
}

.shot-thumb {
    display: block;
    width: 132px;
    height: 88px;
    flex: 0 0 auto;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    background: var(--bg-alt);
    color: var(--text-secondary);
}

.shot-thumb:hover { border-color: rgba(0, 102, 204, 0.48); }

.shot-thumb img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.shot-placeholder {
    display: grid;
    place-items: center;
    height: 100%;
    font-size: var(--text-caption);
}

.ab-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 18px;
}

.ab-btn.primary {
    border-color: var(--cta);
    background: var(--cta);
    color: #fff;
    font-weight: 600;
}

.ab-btn.primary:hover {
    border-color: var(--cta-hover-aa);
    background: var(--cta-hover-aa);
    color: #fff;
}

.iframe-wrap {
    display: none;
    margin-top: 16px;
    overflow: hidden;
    border: 1px solid var(--border-subtle);
    border-radius: var(--radius-card);
    background: var(--bg-alt);
}

.iframe-wrap.open { display: block; }

.iframe-wrap iframe {
    display: block;
    width: 100%;
    height: 520px;
    border: 0;
    background: var(--bg-light);
}

@media (max-width: 767px) {
    /* モバイルは「ベンチ一覧 / Lab / GitHub」の3件だけ残す（使い方を非表示） */
    .header-nav .nav-link:nth-child(3) { display: none; }
    section { padding-block: 56px; }
    .experiments-grid, .ab-grid { grid-template-columns: minmax(0, 1fr); }
    .exp-card:hover { transform: none; }
    .exp-title-row { flex-direction: column; }
    .exp-title { font-size: clamp(2rem, 9vw, 2.75rem); }
    .exp-meta-grid { grid-template-columns: minmax(0, 1fr); gap: 4px; }
    .exp-meta-grid dd { margin-bottom: 10px; }
    .ab-col { padding: 18px; }
    .iframe-wrap iframe { height: 360px; }
    .footer-inner { flex-direction: column; justify-content: center; gap: 8px; }
}