:root {
  --bg: #f4f1ea;
  --paper: #fffdfa;
  --line: #ddd7cc;
  --ink: #171512;
  --muted: #6d675f;
  --accent: #2457d6;
  --accent-soft: #e9eefc;
  --danger: #b42318;
  --success: #147a52;
  --warning: #8a5a00;
  --sans: "Pretendard Variable", "Pretendard", "SF Pro Display", "Segoe UI", system-ui, sans-serif;
  --serif: "Iowan Old Style", "Noto Serif KR", "Apple SD Gothic Neo", serif;
  --mono: "SFMono-Regular", ui-monospace, monospace;
}
* { box-sizing: border-box; }
body { margin: 0; font-family: var(--sans); color: var(--ink); background: var(--bg); }
pre, code { font-family: var(--mono); }
.shell { max-width: 1560px; margin: 0 auto; padding: 28px; }
.topbar { display: flex; justify-content: space-between; gap: 24px; align-items: flex-end; margin-bottom: 20px; }
.kicker { margin: 0 0 8px; color: var(--muted); text-transform: uppercase; letter-spacing: .08em; font-size: .8rem; }
h1 { margin: 0; font-family: var(--serif); font-size: clamp(2rem, 3vw, 3.1rem); font-weight: 600; letter-spacing: -0.03em; }
.topbar-meta { display: grid; grid-template-columns: repeat(3, minmax(110px, 1fr)); gap: 10px; }
.meta-block { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 12px 14px; }
.meta-block span { display: block; font-size: .72rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; margin-bottom: 6px; }
.meta-block strong { display: block; font-size: .92rem; }
.grid { display: grid; grid-template-columns: 320px 1.1fr 0.95fr; gap: 18px; }
.panel { background: var(--paper); border: 1px solid var(--line); border-radius: 24px; padding: 20px; }
.control-panel { grid-column: 1; }
.fixture-panel { grid-column: 2 / 4; }
.answer-panel { grid-column: 1 / 3; }
.activity-panel { grid-column: 3; }
.detail-panel { grid-column: 1 / 4; }
.panel-head { display: flex; justify-content: space-between; align-items: flex-end; gap: 14px; margin-bottom: 16px; }
.panel-head.compact { margin-bottom: 14px; }
.panel-head h2 { margin: 0; font-size: 1.25rem; letter-spacing: -0.02em; }
.section-label { margin: 0 0 6px; color: var(--muted); font-size: .76rem; letter-spacing: .06em; text-transform: uppercase; }
.count-pill, .typing-state { color: var(--muted); font-size: .88rem; background: #f3efe7; border: 1px solid var(--line); border-radius: 999px; padding: 8px 12px; display: inline-flex; align-items: center; gap: 8px; }
.spinner { width: 12px; height: 12px; border-radius: 999px; border: 2px solid rgba(36, 87, 214, 0.18); border-top-color: var(--accent); animation: spin 0.8s linear infinite; }
.spinner.hidden { display: none; }
@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }
.form-grid { display: grid; gap: 12px; }
label span { display: block; margin-bottom: 6px; font-size: .86rem; color: var(--muted); }
input, select, button { width: 100%; padding: 12px 14px; font: inherit; border-radius: 14px; border: 1px solid var(--line); background: #fff; color: var(--ink); }
.check-row { display: flex; align-items: center; gap: 10px; }
.check-row input { width: auto; }
.button-row { display: flex; gap: 10px; margin: 18px 0; }
button { cursor: pointer; font-weight: 600; }
button.primary { background: var(--ink); color: white; border-color: var(--ink); }
button.secondary { background: transparent; }
button:disabled { opacity: .6; cursor: not-allowed; }
.fixture-summary { color: var(--muted); margin-bottom: 10px; }
.fixture-meta { margin-bottom: 14px; padding: 12px 14px; border-radius: 14px; background: #f3efe7; color: var(--ink); line-height: 1.6; font-size: .92rem; border: 1px solid var(--line); }
.fixture-raw { margin: 0; min-height: 330px; max-height: 330px; overflow: auto; border: 1px solid var(--line); border-radius: 18px; background: #fff; padding: 16px; font-size: .83rem; line-height: 1.65; white-space: pre-wrap; word-break: break-word; }
.answer-body { display: flex; gap: 16px; align-items: flex-start; }
.assistant-mark { width: 42px; height: 42px; border-radius: 12px; background: var(--ink); color: white; display: grid; place-items: center; font-weight: 700; }
.assistant-stream { flex: 1; display: grid; gap: 12px; max-height: 560px; overflow: auto; padding-right: 4px; }
.stream-pending { display: flex; align-items: center; gap: 10px; margin-top: 14px; padding: 12px 14px; border-top: 1px solid var(--line); color: var(--muted); }
.stream-pending.hidden { display: none; }
.assistant-segment-card { border-radius: 24px; border: 1px solid var(--line); background: #fff; padding: 18px 20px; }
.assistant-segment-card.empty { color: var(--muted); min-height: 220px; display: flex; align-items: center; }
.assistant-segment-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 10px; }
.assistant-segment-label { font-size: .76rem; color: var(--muted); text-transform: uppercase; letter-spacing: .06em; }
.assistant-segment-stream { display: grid; gap: 10px; }
.assistant-stream-item { border: 1px solid var(--line); border-radius: 16px; background: #f9f7f2; padding: 12px 14px; }
.assistant-stream-item.assistant { background: #fff; }
.assistant-stream-item.tool_use { border-left: 4px solid var(--warning); }
.assistant-stream-item.tool_result { border-left: 4px solid var(--accent); }
.assistant-stream-label { font-size: .74rem; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; margin-bottom: 8px; }
.assistant-stream-body { margin: 0; white-space: pre-wrap; word-break: break-word; }
.assistant-stream-body.text { font-family: var(--serif); font-size: 1.08rem; line-height: 1.9; min-height: 48px; }
.activity-feed { display: flex; flex-direction: column; gap: 10px; max-height: 360px; overflow: auto; }
.activity-item { border: 1px solid var(--line); background: #fff; border-radius: 18px; padding: 12px 14px; }
.activity-item.ok { border-left: 4px solid var(--success); }
.activity-item.warn { border-left: 4px solid var(--warning); }
.activity-item.danger { border-left: 4px solid var(--danger); }
.activity-item.neutral { border-left: 4px solid var(--accent); }
.activity-label { font-size: .76rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-bottom: 8px; }
.activity-text { font-size: .93rem; line-height: 1.6; white-space: pre-wrap; word-break: break-word; }
.output-box { margin: 0; min-height: 260px; max-height: 360px; overflow: auto; padding: 14px 16px; border-radius: 18px; border: 1px solid var(--line); background: #fff; font-size: .86rem; line-height: 1.6; white-space: pre-wrap; word-break: break-word; font-family: var(--mono); }
.detail-grid.single { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (max-width: 1320px) { .grid { grid-template-columns: 1fr; } .control-panel,.fixture-panel,.answer-panel,.activity-panel,.detail-panel { grid-column: auto; } }