/* ===== Theme tokens (light only) ===== */
:root {
  --bg: #f3f6fa;
  --bg-panel: #ffffff;
  --bg-elev: #eaeff5;
  --border: #d8e0ea;
  --border-strong: #c2cfdd;
  --text: #1b2530;
  --text-dim: #5f6b7a;
  --text-mid: #44505f;
  --accent: #2b7de0;
  --accent-text: #ffffff;
  --accent-hover: #4a93ec;
  --ok: #1f8a4c;
  --bad: #d23b3b;
  --warn: #b97400;
  --warn-bg: #fff3df;
  --err-bg: #fdeaea;
  --info-bg: #e6f0fb;
  --canvas-bg: #ffffff;
  --canvas-border: #c9d4e0;
  --canvas-hint: #7c8aa0;
  --debug-bg: #eef2f7;
  --debug-text: #1f8a4c;
  --shadow: rgba(20,40,80,.18);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  background: var(--bg); color: var(--text);
  min-height: 100vh;
  transition: background .2s ease, color .2s ease;
}
header {
  position: relative;
  padding: 18px 24px; border-bottom: 1px solid var(--border);
}
header h1 { font-size: 22px; font-weight: 700; }
.sub { color: var(--text-dim); font-size: 13px; margin-top: 4px; }

.tabs { display: flex; gap: 8px; padding: 12px 24px 0; }
.tab {
  background: var(--bg-elev); color: var(--text-dim); border: 1px solid var(--border);
  padding: 8px 18px; border-radius: 8px 8px 0 0; cursor: pointer; font-size: 14px;
}
.tab.active { background: var(--accent); color: var(--accent-text); border-color: var(--accent); font-weight: 600; }

main {
  display: grid; grid-template-columns: 300px 1fr 340px; gap: 16px;
  padding: 16px 24px 32px; align-items: start;
}
.panel {
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: 10px; padding: 16px;
}
/* Keep the input form above any fixed/overlay element so it stays clickable */
.panel.inputs { position: relative; z-index: 2; }
.panel h2 { font-size: 14px; color: var(--text-dim); margin-bottom: 12px; text-transform: uppercase; letter-spacing: .5px; }

.form.hidden { display: none; }
.form { display: flex; flex-direction: column; gap: 12px; }
label { display: flex; flex-direction: column; font-size: 13px; color: var(--text-mid); gap: 6px; }
input, select {
  background: var(--bg); border: 1px solid var(--border-strong); color: var(--text);
  border-radius: 7px; padding: 8px 10px; font-size: 14px; outline: none;
}
input:focus, select:focus { border-color: var(--accent); }
.slider-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.slider-row input[type=range] { flex: 1; }
.note-row { margin: 0 0 10px; }
.note-row label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 5px; }
.note-row input[type=text] {
  width: 100%; box-sizing: border-box; padding: 8px 10px; font-size: 13px;
  border: 1px solid var(--border); border-radius: 6px;
  background: var(--input-bg); color: var(--text);
}
.note-row input[type=text]:focus { outline: none; border-color: var(--accent); }
#c_compress_val { font-size: 12px; color: var(--accent); min-width: 42px; }

.preview { display: flex; flex-direction: column; }
#canvas-wrap {
  position: relative;
  width: 100%; height: 460px; background: var(--canvas-bg);
  border: 1px solid var(--canvas-border); border-radius: 8px; overflow: hidden;
}
#view { width: 100%; height: 100%; display: block; }
#preview-hint {
  position: absolute; inset: 0; display: flex; align-items: center; justify-content: center;
  color: var(--canvas-hint); font-size: 13px; text-align: center; padding: 20px; pointer-events: none;
}
#preview-hint.hidden { display: none; }

.btn-primary {
  margin-top: 14px; width: 100%;
  background: var(--accent); color: var(--accent-text); border: none;
  padding: 11px; border-radius: 8px; font-weight: 700; font-size: 14px; cursor: pointer;
}
.btn-primary:hover { background: var(--accent-hover); }
.validate-status { font-size: 12.5px; margin-top: 8px; min-height: 16px; }
.validate-status.ok { color: var(--ok); }
.validate-status.bad { color: var(--bad); }

.debug {
  display: none;
  margin-top: 8px; font: 11px/1.5 ui-monospace, Menlo, Consolas, monospace;
  color: var(--debug-text); background: var(--debug-bg); border: 1px solid var(--border);
  border-radius: 6px; padding: 8px; max-height: 130px; overflow: auto; white-space: pre-wrap;
}

.results { max-height: 760px; overflow-y: auto; display: flex; flex-direction: column; }
.kv { display: flex; justify-content: space-between; padding: 7px 0; border-bottom: 1px dashed var(--border); font-size: 13px; }
.kv .k { color: var(--text-dim); }
.kv .v { color: var(--text); font-variant-numeric: tabular-nums; font-weight: 600; }
.kv .v.warn { color: var(--warn); }
.kv .v.err { color: var(--bad); }

#c_compress_val, .hl { color: var(--accent); }
#warnings { margin-top: 14px; display: flex; flex-direction: column; gap: 8px; }
.warn-chip, .err-chip, .info-chip {
  font-size: 12.5px; padding: 8px 10px; border-radius: 7px; line-height: 1.4;
}
.warn-chip { background: var(--warn-bg); color: var(--warn); border: 1px solid var(--border-strong); }
.err-chip { background: var(--err-bg); color: var(--bad); border: 1px solid var(--border-strong); }
.info-chip { background: var(--info-bg); color: var(--accent); border: 1px solid var(--border-strong); }
/* Secondary button (export report) */
.btn-secondary {
  margin-top: 14px; width: 100%;
  background: var(--bg-elev); color: var(--text-mid); border: 1px solid var(--border-strong);
  padding: 10px; border-radius: 8px; font-weight: 600; font-size: 13px; cursor: pointer;
}
.btn-secondary:hover { background: var(--border); border-color: var(--accent); color: var(--text); }
/* Pin export button to the bottom of the results panel so it stays visible */
.results .btn-secondary {
  position: sticky; bottom: 0; z-index: 2;
  background: var(--bg-panel);
  box-shadow: 0 -8px 12px var(--bg-panel);
}

.hint { color: var(--text-dim); font-size: 12px; margin-top: 14px; line-height: 1.5; }

/* ===== AI 结果解读（常驻于结果区，无抽屉） ===== */
/* (抽屉外壳样式已随 AI 助手抽屉移除) */
.ai-grid label { font-size: 12px; }
.ai-out { font-size: 13px; line-height: 1.6; color: var(--text-mid); white-space: pre-wrap; }
/* AI 结果解读：常驻在结果区，与计算结果用分隔线区分 */
.ai-explain-block { margin-top: 16px; padding-top: 14px; border-top: 1px solid var(--border); }
.ai-explain-block h3 { font-size: 14px; margin: 0 0 6px; color: var(--accent); }
.ai-explain-block .ai-out { margin-top: 8px; }
.ai-out .kv { border-bottom: 1px dashed var(--border); }
.ai-out .rationale { margin-top: 8px; color: var(--accent); }
/* AI design "说明" note: standalone line, dark title (light theme) */
.ai-out .note-block { margin-top: 10px; }
.ai-out .note-title { display: block; color: #0a1a2f; font-size: 13px; font-weight: 600; }
.ai-out .note-body { margin-top: 2px; color: var(--text-mid); font-size: 13px; line-height: 1.5; }
/* Real-calculation block appended after AI design text (overrides AI numbers) */
.real-check { margin-top: 12px; border: 1px solid var(--accent); border-radius: 8px; padding: 10px 12px; background: var(--info-bg); }
.real-check .rc-title { font-size: 12.5px; font-weight: 700; color: var(--accent); margin-bottom: 6px; letter-spacing: .3px; }
.real-check table { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.real-check td { padding: 4px 6px; border-bottom: 1px dashed var(--border); }
.real-check .rc-k { color: var(--text-dim); width: 54%; }
.real-check .rc-v { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; }
.real-check .rc-note { margin-top: 8px; font-size: 11.5px; color: var(--text-dim); line-height: 1.5; }
/* Shown when backend runs with AI_MOCK=1 (canned data, ignores input) */
.ai-out .mock-warn {
  margin-bottom: 8px; padding: 6px 8px; border-radius: 6px;
  background: #4a3410; border: 1px solid #8a6a1e; color: #ffd479;
  font-size: 12px; line-height: 1.5;
}

@media (max-width: 1000px) {
  main { grid-template-columns: 1fr; }
  #canvas-wrap { height: 360px; }
  .ai-grid { grid-template-columns: repeat(2, 1fr); }
}