:root {
  --bg: #faf8f4;
  --surface: #ffffff;
  --text: #1c1b17;
  --muted: #706c60;
  --accent: #2f6f65;
  --accent-ink: #f4faf8;
  --border: #e6e1d5;
  --warn: #b5502e;
  --ok: #2f6f65;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181a;
    --surface: #1e2123;
    --text: #ece9e2;
    --muted: #9b968a;
    --accent: #6fc2b4;
    --accent-ink: #0f1a18;
    --border: #2c2f30;
    --warn: #e08a6a;
    --ok: #6fc2b4;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Noto Sans KR", sans-serif;
  padding-inline: 16px;
  padding-block: 32px;
}

main {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.tabs, .subtabs {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.tabs { margin-bottom: 20px; }
.subtabs { margin-bottom: 16px; }

.tab-btn, .subtab-btn {
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  cursor: pointer;
}
.subtab-btn { font-size: 13px; padding: 7px 13px; }
.tab-btn[aria-selected="true"], .subtab-btn[aria-selected="true"] {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}

.tab-panel, .subtab-panel {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.tab-panel[hidden], .subtab-panel[hidden] {
  display: none;
}

header {
  max-width: 720px;
  margin: 0 auto 24px;
}

header h1 { margin: 0 0 4px; font-size: 24px; }
.lede { color: var(--muted); font-size: 14px; margin: 0; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 20px;
}

.card h2 { margin-top: 0; font-size: 17px; }
.card h3 { font-size: 14px; margin: 16px 0 8px; }
.desc { color: var(--muted); font-size: 13.5px; line-height: 1.55; }

label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 12px;
}

label.row {
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 400;
  font-size: 13.5px;
}

input[type="text"],
input[type="number"],
input[type="date"],
select,
textarea {
  width: 100%;
  font-size: 14px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  margin-top: 4px;
  font-family: inherit;
}
textarea { font-family: ui-monospace, monospace; font-size: 12.5px; line-height: 1.5; resize: vertical; }

.ai-prompt-box { margin: 10px 0; }
.ai-prompt-box button { margin-top: 8px; }

input[type="checkbox"] { width: 16px; height: 16px; accent-color: var(--accent); }

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 16px;
}
@media (max-width: 480px) {
  .grid-2 { grid-template-columns: 1fr; }
}

button {
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 9px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
}

button[type="submit"] {
  background: var(--accent);
  color: var(--accent-ink);
  border: none;
  width: 100%;
  margin-top: 12px;
  padding: 11px 14px;
}

button:disabled { opacity: 0.55; cursor: default; }
button[aria-pressed="true"] {
  background: var(--accent);
  color: var(--accent-ink);
  border-color: var(--accent);
}

.status { font-size: 13px; min-height: 18px; margin-top: 8px; }
.status[data-state="ok"] { color: var(--ok); }
.status[data-state="err"] { color: var(--warn); }

.strategy-block {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  margin-bottom: 10px;
  background: var(--bg);
}

.strategy-block .row-head {
  display: flex;
  gap: 8px;
  align-items: flex-end;
  margin-bottom: 8px;
}
.strategy-block .row-head select { flex: 1; }
.strategy-block .row-head input { flex: 1; }
.strategy-block .remove-strategy { flex: none; }

.param-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px 12px;
}
@media (max-width: 480px) {
  .param-grid { grid-template-columns: 1fr; }
}

.tier-row {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-bottom: 6px;
}
.tier-row input { flex: 1; }

.hint { font-size: 11.5px; color: var(--muted); margin-top: 2px; }

.table-scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-top: 12px;
}
.table-scroll table {
  width: max-content;
  min-width: 100%;
}
th, td {
  text-align: right;
  padding: 6px 8px;
  border-bottom: 1px solid var(--border);
}
th:first-child, td:first-child,
th:nth-child(2), td:nth-child(2) { text-align: left; }

.similar-picker {
  margin: 8px 0 4px;
}
.similar-picker select {
  width: 100%;
}

.similar-box {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px;
  margin-top: 10px;
  background: var(--bg);
}
.similar-box .desc { margin: 0 0 6px; }

.chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  font-size: 12px;
  margin-top: 8px;
}
.chart-legend span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}
.chart-legend i {
  width: 10px; height: 10px; border-radius: 2px; display: inline-block;
}

.warn-box {
  border: 1px solid var(--warn);
  border-radius: 10px;
  padding: 10px 12px;
  margin: 10px 0;
  font-size: 13.5px;
  color: var(--warn);
  background: var(--bg);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 8px;
  margin: 10px 0;
}
.stat-tile {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  background: var(--bg);
}
.stat-tile .label {
  font-size: 11.5px;
  color: var(--muted);
  margin-bottom: 3px;
}
.stat-tile .value {
  font-size: 17px;
  font-weight: 700;
}
.stat-tile .value.positive { color: var(--ok); }
.stat-tile .value.negative { color: var(--warn); }

.result-tag {
  font-weight: 600;
}
.result-tag.positive { color: var(--ok); }
.result-tag.negative { color: var(--warn); }

.chart-wrap {
  position: relative;
}
.chart-wrap svg {
  display: block;
  cursor: crosshair;
}
.chart-tooltip {
  position: absolute;
  pointer-events: none;
  z-index: 5;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 12px;
  line-height: 1.5;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  white-space: nowrap;
  visibility: hidden;
}
.chart-tooltip .tt-date {
  color: var(--muted);
  margin-bottom: 2px;
}
.chart-tooltip .tt-row {
  display: flex;
  align-items: center;
  gap: 5px;
}
.chart-tooltip .tt-row i {
  width: 8px; height: 8px; border-radius: 2px; display: inline-block; flex: none;
}

.chart-checklist {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  font-size: 13px;
  margin: 8px 0;
}
.chart-checklist label {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-weight: 400;
  cursor: pointer;
}
.chart-checklist input {
  width: auto;
}

footer {
  max-width: 720px;
  margin: 24px auto 0;
  font-size: 12px;
  color: var(--muted);
  line-height: 1.6;
}
footer code {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
}