@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
  --bg:           #0e0f11;
  --bg-1:         #15171a;
  --bg-2:         #1c1f23;
  --bg-3:         #23272c;
  --border:       rgba(255,255,255,0.08);
  --border-hi:    rgba(255,255,255,0.16);
  --text:         #ede9e3;
  --text-2:       rgba(237,233,227,0.72);
  --text-3:       rgba(237,233,227,0.42);
  --accent:       #e05a2b;
  --accent-glow:  rgba(224,90,43,0.20);
  --accent-dim:   rgba(224,90,43,0.09);
  --green:        #3ecf8e;
  --green-glow:   rgba(62,207,142,0.18);
  --amber:        #f5a623;
  --amber-glow:   rgba(245,166,35,0.18);
  --red:          #e05a2b;
  --red-glow:     rgba(224,90,43,0.18);
  --mono:  'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  --serif: 'DM Serif Display', 'STSong', 'Songti SC', serif;

  /* ── type scale ── */
  --t-xs:   11px;   /* labels, badges */
  --t-sm:   13px;   /* secondary copy */
  --t-base: 15px;   /* primary body */
  --t-md:   18px;   /* subheadings */
  --t-lg:   24px;   /* data numbers */
  --t-xl:   32px;   /* section heads */
  --t-2xl:  48px;   /* decision verdict */
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font-family: var(--mono);
  font-size: var(--t-base);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ── GRAIN ── */
.grain {
  position: fixed; inset: 0; pointer-events: none; z-index: 1000;
  opacity: 0.028;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* ── SHELL ── */
.shell {
  max-width: 1520px;
  margin: 0 auto;
  padding: 0 32px 80px;
}

/* ── TOPBAR ── */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0;
  height: 56px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 60px;
  gap: 20px;
}

.topbar-left {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}

.brand-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 8px var(--accent);
  animation: pulse-dot 2.6s ease-in-out infinite;
  flex-shrink: 0;
}
@keyframes pulse-dot {
  0%,100% { opacity:1; transform:scale(1); }
  50%      { opacity:0.35; transform:scale(0.6); }
}

.brand-name {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text);
}

.brand-sep {
  font-size: 13px;
  color: var(--text-3);
  margin: 0 2px;
}

.brand-product {
  font-size: 13px;
  color: var(--text-3);
  letter-spacing: 0.04em;
}

.topbar-right {
  display: flex;
  align-items: center;
  gap: 14px;
}

.refresh-btn {
  appearance: none;
  border: 1px solid var(--border-hi);
  border-radius: 8px;
  background: transparent;
  color: var(--text-2);
  font-family: var(--mono);
  font-size: var(--t-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  padding: 8px 16px;
  cursor: pointer;
  transition: all 160ms ease;
  white-space: nowrap;
}
.refresh-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
  box-shadow: 0 0 14px var(--accent-glow);
}
.refresh-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
  pointer-events: none;
}

.refresh-status {
  font-size: var(--t-xs);
  letter-spacing: 0.04em;
  color: var(--text-3);
  transition: color 280ms ease;
  white-space: nowrap;
}
.refresh-status.ok  { color: var(--green); }
.refresh-status.err { color: var(--accent); }

@keyframes spin { to { transform: rotate(360deg); } }

/* ── HERO ── */
.hero {
  padding: 0 0 56px;
}

.hero h1 {
  font-family: var(--serif);
  font-size: clamp(36px, 4vw, 60px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero-copy {
  margin-top: 14px;
  font-size: var(--t-sm);
  line-height: 1.75;
  color: var(--text-2);
  max-width: 520px;
}

/* ── STATS ROW ── */
.hero-stats {
  display: flex;
  gap: 1px;
  margin-top: 32px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  max-width: 760px;
}

.stat-card {
  flex: 1;
  padding: 18px 22px;
  background: var(--bg-1);
  transition: background 180ms ease;
}
.stat-card:hover { background: var(--bg-2); }

.stat-label {
  display: block;
  font-size: var(--t-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-3);
}

.stat-card strong {
  display: block;
  margin-top: 6px;
  font-size: var(--t-lg);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

.stat-card strong.date-range {
  font-size: var(--t-sm);
  font-weight: 500;
  letter-spacing: 0;
  line-height: 1.6;
}

.stat-card.loading strong {
  color: var(--text-3);
  animation: blink 1.3s ease-in-out infinite;
}
@keyframes blink {
  0%,100% { opacity:1; }
  50%      { opacity:0.25; }
}

/* ── WORKSPACE ── */
.workspace {
  display: grid;
  grid-template-columns: minmax(400px, 500px) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

/* ── PANEL ── */
.panel {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: 20px;
  overflow: hidden;
}

.panel-header {
  padding: 28px 28px 24px;
  border-bottom: 1px solid var(--border);
}

.panel-kicker {
  font-size: var(--t-xs);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-3);
}

.panel h2 {
  font-family: var(--serif);
  font-weight: 400;
  font-size: var(--t-xl);
  margin-top: 8px;
  line-height: 1.1;
  color: var(--text);
}

/* ── FORM ── */
.input-panel form { padding: 24px 28px 28px; }

.field { display: block; margin-bottom: 22px; }

.field > span {
  display: block;
  font-size: var(--t-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-2);
  margin-bottom: 10px;
}

input[type="text"],
textarea {
  width: 100%;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 18px;
  font-family: var(--mono);
  font-size: var(--t-sm);
  color: var(--text);
  outline: none;
  transition: border-color 150ms ease, box-shadow 150ms ease;
  line-height: 1.7;
}
input[type="text"]::placeholder,
textarea::placeholder { color: var(--text-3); }
input[type="text"]:focus,
textarea:focus {
  border-color: rgba(224,90,43,0.55);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
textarea {
  min-height: 300px;
  resize: vertical;
}

/* ── SEGMENTED ── */
.segmented {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.segmented label { position: relative; cursor: pointer; }
.segmented input  { position: absolute; opacity: 0; pointer-events: none; }
.segmented span {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  padding: 13px 8px;
  border: 1px solid var(--border);
  background: var(--bg-2);
  font-size: var(--t-sm);
  font-weight: 500;
  color: var(--text-2);
  transition: all 150ms ease;
}
.segmented label:hover span {
  border-color: var(--border-hi);
  color: var(--text);
}
.segmented input:checked + span {
  background: var(--accent-dim);
  border-color: rgba(224,90,43,0.5);
  color: var(--accent);
  box-shadow: 0 0 14px var(--accent-glow);
}

/* ── ACTIONS ── */
.actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 4px; }

button {
  appearance: none;
  border: none;
  cursor: pointer;
  font-family: var(--mono);
  font-size: var(--t-sm);
  font-weight: 500;
  letter-spacing: 0.1em;
  border-radius: 10px;
  padding: 14px 26px;
  transition: all 150ms ease;
}

.primary {
  background: var(--accent);
  color: #fff;
  text-transform: uppercase;
  position: relative;
  overflow: hidden;
}
.primary::after {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.1) 0%, transparent 55%);
}
.primary:hover {
  background: #e8612e;
  box-shadow: 0 4px 22px rgba(224,90,43,0.38);
  transform: translateY(-1px);
}
.primary:active { transform: translateY(0); }

.ghost {
  background: var(--bg-2);
  color: var(--text-2);
  border: 1px solid var(--border);
  text-transform: uppercase;
}
.ghost:hover {
  border-color: var(--border-hi);
  color: var(--text);
}

/* ── EMPTY STATE ── */
.empty-state {
  padding: 52px 28px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.empty-state p {
  font-size: var(--t-md);
  color: var(--text-2);
}
.empty-state small {
  font-size: var(--t-sm);
  color: var(--text-3);
  line-height: 1.8;
}

.hidden { display: none !important; }

/* ── RESULT ── */
.result {
  animation: slideIn 300ms cubic-bezier(0.22, 1, 0.36, 1) both;
}
@keyframes slideIn {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── DECISION HEAD ── */
.decision-head {
  padding: 28px 28px 24px;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.decision-head::before {
  content: '';
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 4px;
  background: var(--text-3);
  transition: background 350ms ease, box-shadow 350ms ease;
}

.result[data-level="建议投流"] .decision-head::before
  { background: var(--green);  box-shadow: 2px 0 18px var(--green-glow); }
.result[data-level="小额测试"] .decision-head::before
  { background: var(--amber);  box-shadow: 2px 0 18px var(--amber-glow); }
.result[data-level="暂缓投流"] .decision-head::before
  { background: var(--red);    box-shadow: 2px 0 18px var(--red-glow); }

.decision-label {
  font-size: var(--t-xs);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-3);
  padding-left: 8px;
}

.decision-head h3 {
  font-family: var(--serif);
  font-size: var(--t-2xl);
  font-weight: 400;
  line-height: 1;
  margin-top: 10px;
  padding-left: 8px;
  color: var(--text-2);
  transition: color 350ms ease;
}

.result[data-level="建议投流"] .decision-head h3 { color: var(--green); }
.result[data-level="小额测试"] .decision-head h3 { color: var(--amber); }
.result[data-level="暂缓投流"] .decision-head h3 { color: var(--red); }

.confidence-card {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
  margin-left: 8px;
  padding: 9px 18px;
  border-radius: 8px;
  background: var(--bg-2);
  border: 1px solid var(--border);
}
.confidence-card span {
  font-size: var(--t-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-3);
}
.confidence-card strong {
  font-size: var(--t-base);
  font-weight: 600;
  color: var(--text);
}

/* ── METRICS GRID (budget + cpm + cpf) ── */
.budget-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border-bottom: 1px solid var(--border);
}
.budget-strip > div {
  padding: 20px 28px;
  background: var(--bg-1);
}
.budget-strip span {
  display: block;
  font-size: var(--t-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}
.budget-strip strong {
  display: block;
  margin-top: 10px;
  font-size: var(--t-lg);
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.02em;
}

/* ── FORECAST ── */
.forecast {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1px;
  background: var(--border);
  border-bottom: 1px solid var(--border);
}
.forecast-card {
  padding: 18px 28px;
  background: var(--bg-1);
}
.forecast-card span {
  display: block;
  font-size: var(--t-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}
.forecast-card strong {
  display: block;
  margin-top: 8px;
  font-size: var(--t-base);
  font-weight: 500;
  color: var(--text);
  line-height: 1.5;
}

/* ── RESULT SECTIONS ── */
.result-section {
  padding: 22px 28px;
  border-bottom: 1px solid var(--border);
}
.result-section:last-child { border-bottom: none; }

.result-section h4 {
  font-size: var(--t-xs);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-3);
  margin-bottom: 16px;
}

.result-section ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.result-section ul li {
  font-size: var(--t-sm);
  color: var(--text-2);
  line-height: 1.75;
  padding-left: 18px;
  position: relative;
}
.result-section ul li::before {
  content: '—';
  position: absolute;
  left: 0;
  color: var(--text-3);
}

/* ── SIMILAR CASES ── */
.similar-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.case-card {
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px 20px;
  transition: border-color 150ms ease;
}
.case-card:hover { border-color: var(--border-hi); }
.case-card.muted { color: var(--text-3); font-size: var(--t-sm); }

.case-title {
  font-size: var(--t-base);
  color: var(--text);
  line-height: 1.5;
  font-weight: 500;
}

.case-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 14px;
  margin-top: 8px;
}
.case-meta span {
  font-size: var(--t-xs);
  color: var(--text-3);
}

.case-stats, .case-metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 10px;
}
.case-stats span, .case-metrics span {
  font-size: var(--t-xs);
  color: var(--text-2);
  background: var(--bg-3);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 4px 10px;
  letter-spacing: 0.02em;
}

/* ── RESPONSIVE ── */
@media (max-width: 1160px) {
  .workspace { grid-template-columns: 1fr; }
  .budget-strip { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
  .shell { padding: 0 18px 48px; }
  .hero h1 { max-width: none; font-size: clamp(44px, 14vw, 80px); }
  .segmented { grid-template-columns: 1fr; }
  .hero-stats { flex-wrap: wrap; }
  .budget-strip { grid-template-columns: 1fr; }
}