/* ============================================
   Arena — head-to-head trajectory comparison
   ============================================ */

.arena-hero-section {
    padding-top: 2.5rem !important;
    padding-bottom: 0 !important;
}

.arena-desc {
    font-size: 0.88rem;
    color: #777;
    line-height: 1.6;
    max-width: 680px;
}

/* ── Model pickers ── */
.arena-select-section {
    padding-top: 0.5rem !important;
    padding-bottom: 0.5rem !important;
}

.arena-model-pickers {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.arena-picker {
    flex: 1;
    min-width: 0;
}

.arena-picker-label {
    display: block;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.6px;
    color: #aaa;
    margin-bottom: 0.4rem;
}

.arena-select-wrap {
    width: 100%;
}

.arena-select-wrap select {
    width: 100%;
    padding: 0.55rem 2rem 0.55rem 0.8rem;
    font-size: 0.88rem;
}

.arena-model-meta {
    font-size: 0.78rem;
    color: #999;
    margin-top: 0.35rem;
    min-height: 1.2em;
}

.arena-vs {
    flex-shrink: 0;
    font-family: 'Noto Serif', Georgia, serif;
    font-size: 0.9rem;
    font-weight: 600;
    color: #ccc;
    padding-top: 1.8rem;
}

/* ── Loading ── */
.arena-loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 3rem 0;
    color: #999;
    font-size: 0.9rem;
}

/* ── Section titles ── */
.arena-section-title {
    font-family: 'Noto Serif', Georgia, serif;
    font-size: 1.05rem;
    font-weight: 600;
    color: #1a1a1a;
    margin: 0 0 0.15rem;
}

.arena-section-desc {
    font-size: 0.78rem;
    color: #999;
    margin: 0 0 0.8rem;
}

/* ── Confusion Matrix ── */
.arena-matrix-section {
    margin-bottom: 1.5rem;
}

.arena-matrix {
    display: grid;
    grid-template-columns: 60px 24px 1fr 1fr;
    grid-template-rows: 24px 24px 1fr 1fr;
    gap: 6px;
    max-width: 420px;
}

.arena-matrix-corner {
    grid-column: 1 / 3;
    grid-row: 1 / 3;
}

.arena-matrix-col-header {
    grid-column: 3 / 5;
    grid-row: 1;
    text-align: center;
    font-size: 0.72rem;
    font-weight: 600;
    color: #888;
    align-self: end;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.arena-matrix-row-header {
    grid-column: 1;
    grid-row: 3 / 5;
    writing-mode: vertical-lr;
    transform: rotate(180deg);
    text-align: center;
    font-size: 0.72rem;
    font-weight: 600;
    color: #888;
    justify-self: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.arena-matrix-label {
    font-size: 0.68rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.arena-matrix-label--col.arena-matrix-label--pass { grid-column: 3; grid-row: 2; color: #1a7a3a; }
.arena-matrix-label--col.arena-matrix-label--fail { grid-column: 4; grid-row: 2; color: #a8323c; }
.arena-matrix-label--row.arena-matrix-label--pass { grid-column: 2; grid-row: 3; color: #1a7a3a; }
.arena-matrix-label--row.arena-matrix-label--fail { grid-column: 2; grid-row: 4; color: #a8323c; }

.arena-matrix-cell {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
    padding: 0.75rem 0.5rem;
    border: 1px solid #eee;
    border-radius: 8px;
    background: #fafaf8;
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit;
}

.arena-matrix-cell:hover {
    border-color: #ccc;
    background: #f5f5f3;
}

.arena-matrix-cell--active {
    border-color: #1a1a1a !important;
    background: #fff !important;
    box-shadow: 0 0 0 1px #1a1a1a;
}

.arena-matrix-cell--pp { grid-column: 3; grid-row: 3; }
.arena-matrix-cell--pf { grid-column: 4; grid-row: 3; }
.arena-matrix-cell--fp { grid-column: 3; grid-row: 4; }
.arena-matrix-cell--ff { grid-column: 4; grid-row: 4; }

.arena-cell-count {
    font-size: 1.3rem;
    font-weight: 700;
    color: #1a1a1a;
    font-variant-numeric: tabular-nums;
    line-height: 1;
}

.arena-cell-label {
    font-size: 0.65rem;
    color: #999;
    white-space: nowrap;
}

.arena-matrix-cell--pp .arena-cell-count { color: #1a7a3a; }
.arena-matrix-cell--ff .arena-cell-count { color: #a8323c; }
.arena-matrix-cell--pf .arena-cell-count { color: #b8860b; }
.arena-matrix-cell--fp .arena-cell-count { color: #5b7bb5; }

.arena-matrix-summary {
    margin-top: 0.5rem;
    font-size: 0.78rem;
    color: #aaa;
}

/* ── Task list ── */
.arena-tasklist-section {
    margin-bottom: 1.5rem;
}

.arena-tasklist-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.6rem;
}

.arena-task-count {
    font-size: 0.82rem;
    font-weight: 400;
    color: #aaa;
}

.arena-tasklist {
    border: 1px solid #eee;
    border-radius: 10px;
    overflow: hidden;
    max-height: 360px;
    overflow-y: auto;
}

.arena-task-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 0.6rem 0.9rem;
    background: #fff;
    border: none;
    border-bottom: 1px solid #f5f5f3;
    cursor: pointer;
    font-family: inherit;
    text-align: left;
    transition: background 0.12s;
    gap: 0.75rem;
}

.arena-task-row:last-child { border-bottom: none; }

.arena-task-row:hover { background: #fafaf8; }

.arena-task-row--active {
    background: #f5f5f3 !important;
    border-left: 3px solid #1a1a1a;
}

.arena-task-name {
    font-size: 0.82rem;
    color: #333;
    font-weight: 500;
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.arena-task-outcomes {
    display: flex;
    gap: 0.75rem;
    flex-shrink: 0;
}

.arena-task-model-result {
    display: flex;
    align-items: center;
    gap: 0.3rem;
}

.arena-task-model-label {
    font-size: 0.68rem;
    font-weight: 600;
    color: #bbb;
    width: 12px;
}

.arena-task-steps {
    font-size: 0.68rem;
    color: #ccc;
    white-space: nowrap;
}

.arena-mini-badge {
    font-size: 0.65rem;
    font-weight: 600;
    padding: 0.1rem 0.35rem;
    border-radius: 3px;
    white-space: nowrap;
}

.arena-mini-badge--pass { background: #e6f9ee; color: #1a7a3a; }
.arena-mini-badge--fail { background: #fde8ec; color: #a8323c; }

.arena-empty {
    padding: 2rem;
    text-align: center;
    color: #ccc;
    font-size: 0.85rem;
}

/* ── Side-by-side comparison ── */
.arena-comparison {
    margin-bottom: 2rem;
}

.arena-comparison-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.5rem;
}

.arena-comparison-header-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.arena-comparison-close {
    background: none;
    border: none;
    font-size: 1rem;
    color: #bbb;
    cursor: pointer;
    padding: 0.25rem 0.4rem;
    border-radius: 4px;
    transition: all 0.15s;
}
.arena-comparison-close:hover { background: #f0f0f0; color: #666; }

.arena-task-goal {
    padding: 0.75rem 0.9rem;
    margin-bottom: 1rem;
    background: #f8f7f5;
    border: 1px solid #eee;
    border-radius: 8px;
    font-size: 0.85rem;
    line-height: 1.6;
    color: #333;
}

.arena-comparison-columns {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    align-items: start;
}

.arena-col {
    border: 1px solid #eee;
    border-radius: 10px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.arena-col-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.65rem 0.9rem;
    background: #fafaf8;
    border-bottom: 1px solid #eee;
    flex-wrap: wrap;
}

.arena-col-model {
    font-family: 'Noto Serif', Georgia, serif;
    font-size: 0.88rem;
    font-weight: 600;
    color: #1a1a1a;
}

.arena-col-badge {
    font-size: 0.68rem;
    font-weight: 600;
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
}
.arena-col-badge--pass { background: #e6f9ee; color: #1a7a3a; }
.arena-col-badge--fail { background: #fde8ec; color: #a8323c; }

.arena-col-steps {
    font-size: 0.72rem;
    color: #bbb;
    margin-left: auto;
}

.arena-col-body {
    max-height: 600px;
    overflow-y: auto;
    padding: 0.75rem;
}

.arena-col-body .traj-step { margin-bottom: 0.6rem; }
.arena-col-body .traj-step:last-child { margin-bottom: 0; }

.arena-col-tokens {
    padding: 0.5rem 0.9rem;
    font-size: 0.72rem;
    color: #bbb;
    text-align: center;
    border-top: 1px solid #eee;
    min-height: 1.5em;
}

/* ── Responsive ── */
@media screen and (max-width: 768px) {
    .arena-model-pickers {
        flex-direction: column;
        gap: 0.5rem;
    }
    .arena-vs {
        padding-top: 0;
        text-align: center;
    }
    .arena-comparison-columns {
        grid-template-columns: 1fr;
    }
    .arena-matrix {
        max-width: 100%;
    }
    .arena-task-outcomes {
        flex-direction: column;
        gap: 0.2rem;
    }
}

/* ── URL deep-link target highlight ── */
.traj-step.url-target-step {
    outline: 3px solid #f5a623;
    background: rgba(245, 166, 35, 0.10);
    transition: outline 0.3s ease, background 0.3s ease;
}