:root {
  --bg: #0e1116;
  --bg-soft: #161b22;
  --panel: #1a2029;
  --panel-2: #212936;
  --border: #2a323f;
  --border-soft: #232b36;
  --text: #e6edf3;
  --muted: #93a1b1;
  --faint: #6b7888;
  --accent: #4f9cf9;
  --accent-2: #7c5cff;
  --green: #3fb950;
  --amber: #d29922;
  --red: #f85149;
  --chip: #263042;
  --radius: 14px;
  --shadow: 0 8px 30px rgba(0, 0, 0, 0.35);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  background: radial-gradient(1200px 600px at 78% -10%, #1c2740 0%, var(--bg) 55%);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.hidden { display: none !important; }

/* ---------- top bar ---------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px clamp(16px, 4vw, 40px);
  border-bottom: 1px solid var(--border-soft);
  background: rgba(14, 17, 22, 0.7);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 20;
}
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  font-size: 30px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 6px 10px;
  line-height: 1;
}
.topbar h1 { font-size: clamp(17px, 2.4vw, 21px); margin: 0; letter-spacing: 0.2px; }
.tag { margin: 2px 0 0; color: var(--muted); font-size: 13px; }
.ghost-link {
  color: var(--muted);
  text-decoration: none;
  font-size: 13px;
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 999px;
  white-space: nowrap;
  transition: all 0.15s;
}
.ghost-link:hover { color: var(--text); border-color: var(--accent); }

/* ---------- layout ---------- */
.layout {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 20px;
  padding: 22px clamp(16px, 4vw, 40px);
  max-width: 1400px;
  margin: 0 auto;
  align-items: start;
}
.panel {
  background: linear-gradient(180deg, var(--panel) 0%, var(--bg-soft) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  box-shadow: var(--shadow);
}
.input-panel { position: sticky; top: 88px; }

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}
.panel-head.second { margin-top: 22px; padding-top: 18px; border-top: 1px dashed var(--border); }
.panel-head h2 { font-size: 15px; margin: 0; color: var(--text); }

/* ---------- form ---------- */
.field { margin-bottom: 14px; display: block; }
.field.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.field-label {
  display: block;
  font-size: 12.5px;
  color: var(--muted);
  margin-bottom: 6px;
  font-weight: 600;
}
.field-label em { font-style: normal; color: var(--faint); font-weight: 400; margin-left: 4px; }

select, input[type="text"], input[type="number"] {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13.5px;
  font-family: inherit;
  transition: border 0.15s;
}
select:focus, input:focus { outline: none; border-color: var(--accent); }
select { cursor: pointer; }

.hint { font-size: 12px; color: var(--faint); margin: 10px 0 0; }
.hint.sub { margin: -4px 0 12px; }

/* ---------- items ---------- */
.items { display: flex; flex-direction: column; gap: 10px; }
.item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
}
.item-row1 { display: flex; gap: 8px; align-items: center; margin-bottom: 8px; }
.item-row1 input[type="text"] { flex: 1; }
.item-del {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--faint);
  border-radius: 8px;
  width: 30px;
  height: 34px;
  cursor: pointer;
  flex: 0 0 auto;
  font-size: 15px;
  line-height: 1;
  transition: all 0.15s;
}
.item-del:hover { color: var(--red); border-color: var(--red); }
.item-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.9fr 0.7fr;
  gap: 8px;
}
.item-grid.wide { grid-template-columns: 1fr 1fr; margin-top: 8px; }
.item select, .item input { font-size: 12.5px; padding: 8px 9px; }
.mini-lab { font-size: 10.5px; color: var(--faint); margin: 0 0 3px 2px; letter-spacing: .3px; text-transform: uppercase; }
.size-wrap { display: flex; gap: 6px; }
.size-wrap input { flex: 1; }
.size-wrap select { flex: 0 0 92px; }

/* ---------- buttons ---------- */
.mini-btn {
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--muted);
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 12.5px;
  cursor: pointer;
  font-family: inherit;
  transition: all 0.15s;
  white-space: nowrap;
}
.mini-btn:hover { color: var(--text); border-color: var(--accent); background: var(--chip); }
.primary-btn {
  width: 100%;
  margin-top: 18px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  border: none;
  color: #fff;
  font-size: 15px;
  font-weight: 600;
  padding: 14px;
  border-radius: 11px;
  cursor: pointer;
  font-family: inherit;
  box-shadow: 0 6px 18px rgba(79, 156, 249, 0.28);
  transition: transform 0.1s, box-shadow 0.15s;
}
.primary-btn:hover { transform: translateY(-1px); box-shadow: 0 8px 22px rgba(79, 156, 249, 0.4); }
.primary-btn:active { transform: translateY(0); }

/* ---------- empty state ---------- */
.empty-state { padding: 20px 10px; text-align: center; }
.empty-emoji { font-size: 46px; margin-bottom: 8px; }
.empty-state h2 { font-size: 17px; margin: 6px 0 12px; line-height: 1.5; }
.empty-state p { color: var(--muted); font-size: 13.5px; max-width: 560px; margin: 0 auto 16px; text-align: left; }
.empty-why {
  list-style: none;
  padding: 0;
  margin: 0 auto;
  max-width: 460px;
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.empty-why li {
  color: var(--muted);
  font-size: 13px;
  padding-left: 26px;
  position: relative;
}
.empty-why li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--green);
  font-weight: 700;
}

/* ---------- result ---------- */
.result-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.score-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
}
.score-chip.ok { color: var(--green); border-color: rgba(63, 185, 80, 0.4); background: rgba(63, 185, 80, 0.08); }
.score-chip.warn { color: var(--amber); border-color: rgba(210, 153, 34, 0.4); background: rgba(210, 153, 34, 0.08); }
.score-chip.over { color: var(--red); border-color: rgba(248, 81, 73, 0.4); background: rgba(248, 81, 73, 0.08); }
.toolbar-actions { display: flex; gap: 8px; flex-wrap: wrap; }

.block { margin-bottom: 22px; }
.block > h3 {
  font-size: 14px;
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
}
.block > h3 .num {
  font-size: 11px;
  background: var(--panel-2);
  border: 1px solid var(--border);
  color: var(--accent);
  border-radius: 6px;
  padding: 2px 7px;
  font-weight: 700;
}

/* budget bar */
.budget-summary { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 12px; }
.stat {
  flex: 1 1 120px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
}
.stat .k { font-size: 11px; color: var(--faint); }
.stat .v { font-size: 18px; font-weight: 700; margin-top: 2px; }
.stat .v small { font-size: 11px; font-weight: 400; color: var(--muted); }
.bar {
  height: 26px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  display: flex;
  margin: 4px 0 6px;
}
.bar span { height: 100%; display: block; }
.bar .seg-inline { background: var(--accent); }
.bar .seg-attach { background: #2f81f7; opacity: 0.55; }
.bar .seg-summary { background: var(--accent-2); }
.bar .seg-free { background: transparent; }
.bar.over .seg-over { background: repeating-linear-gradient(45deg, var(--red), var(--red) 6px, #b62b25 6px, #b62b25 12px); }
.legend { display: flex; flex-wrap: wrap; gap: 12px; font-size: 11.5px; color: var(--muted); margin-bottom: 4px; }
.legend i { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 5px; vertical-align: middle; }

/* placement cards */
.place-item {
  border: 1px solid var(--border);
  border-radius: 11px;
  padding: 12px 14px;
  margin-bottom: 9px;
  background: var(--bg);
}
.place-top { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.place-name { font-weight: 600; font-size: 13.5px; }
.place-meta { font-size: 11.5px; color: var(--faint); margin-left: auto; }
.tag-pill {
  font-size: 11px;
  font-weight: 700;
  padding: 3px 9px;
  border-radius: 999px;
  white-space: nowrap;
}
.p-inline { background: rgba(79,156,249,0.16); color: #79b8ff; }
.p-attach { background: rgba(47,129,247,0.14); color: #58a6ff; }
.p-summary { background: rgba(124,92,255,0.16); color: #b294ff; }
.p-retrieve { background: rgba(63,185,80,0.14); color: #56d364; }
.p-drop { background: rgba(139,148,158,0.14); color: #8b949e; }
.place-why { font-size: 12.5px; color: var(--muted); margin: 7px 0 0; }
.place-why b { color: var(--text); font-weight: 600; }

/* generic list rows */
.rows { display: flex; flex-direction: column; gap: 8px; }
.row-card {
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 9px;
  padding: 10px 12px;
  background: var(--bg);
  font-size: 12.8px;
  color: var(--muted);
}
.row-card b { color: var(--text); }
.row-card.warn { border-left-color: var(--amber); }
.row-card.danger { border-left-color: var(--red); }
.row-card.good { border-left-color: var(--green); }

.seg-step {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 12px 14px;
  margin-bottom: 9px;
  background: var(--bg);
}
.seg-step h4 { margin: 0 0 6px; font-size: 13px; color: var(--accent); }
.seg-step ul { margin: 6px 0 0; padding-left: 18px; }
.seg-step li { font-size: 12.5px; color: var(--muted); margin-bottom: 3px; }
.seg-step .seg-tok { float: right; font-size: 11.5px; color: var(--faint); }

.mono { font-variant-numeric: tabular-nums; }

/* ---------- how / methodology ---------- */
.how {
  max-width: 1000px;
  margin: 10px auto 40px;
  padding: 26px clamp(16px, 4vw, 40px);
}
.how h2 { font-size: 18px; margin: 0 0 18px; }
.how-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 16px;
}
.how-grid h3 { font-size: 14px; margin: 0 0 6px; color: var(--accent); }
.how-grid p { font-size: 13px; color: var(--muted); margin: 0; }
.how-note {
  margin-top: 20px;
  font-size: 12.5px;
  color: var(--faint);
  border-top: 1px dashed var(--border);
  padding-top: 16px;
}
.how-note strong { color: var(--muted); }

/* ---------- footer ---------- */
.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
  padding: 18px clamp(16px, 4vw, 40px);
  border-top: 1px solid var(--border-soft);
  color: var(--faint);
  font-size: 12px;
  max-width: 1400px;
  margin: 0 auto;
}

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--panel-2);
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 10px 18px;
  border-radius: 10px;
  font-size: 13px;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s;
  z-index: 50;
  box-shadow: var(--shadow);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .layout { grid-template-columns: 1fr; }
  .input-panel { position: static; }
  .item-grid { grid-template-columns: 1fr; }
  .item-grid.wide { grid-template-columns: 1fr; }
}