:root {
  --bg: #0a0f1b;
  --bg-2: #111827;
  --panel: rgba(17, 24, 39, 0.78);
  --panel-border: rgba(148, 163, 184, 0.16);
  --text: #eef2ff;
  --muted: #a8b2c8;
  --strong: #ffffff;
  --blue: #7c9cff;
  --purple: #b194ff;
  --cyan: #66d9ef;
  --teal: #45d0b8;
  --gold: #f6d365;
  --pink: #ff8fce;
  --green: #70e6a4;
  --orange: #ffb070;
  --danger: #ff7b7b;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.32);
  --radius-xl: 28px;
  --radius-lg: 22px;
  --radius-md: 16px;
}

* {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(124, 156, 255, 0.16), transparent 28%),
    radial-gradient(circle at top right, rgba(177, 148, 255, 0.14), transparent 22%),
    linear-gradient(180deg, #070b14 0%, var(--bg) 45%, #09111e 100%);
}

.page-shell {
  width: min(1240px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 48px;
}

.hero {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
  margin-bottom: 20px;
}

.glass {
  background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.02)), var(--panel);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid var(--panel-border);
  box-shadow: var(--shadow);
}

.hero-copy,
.hero-card,
.panel {
  border-radius: var(--radius-xl);
}

.hero-copy {
  padding: 32px;
}

.eyebrow {
  display: inline-flex;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(124, 156, 255, 0.12);
  border: 1px solid rgba(124, 156, 255, 0.24);
  color: #c9d6ff;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 18px 0 14px;
  font-size: clamp(2.3rem, 5vw, 4.2rem);
  line-height: 0.95;
  letter-spacing: -0.04em;
}

.hero p {
  margin: 0;
  max-width: 60ch;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.7;
}

.hero-card {
  padding: 22px;
  display: grid;
  gap: 14px;
  align-content: center;
}

.hero-stat {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
}

.stat-label {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 6px;
}

.hero-stat strong {
  font-size: 1.1rem;
}

.layout {
  display: grid;
  grid-template-columns: 400px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

.panel {
  padding: 22px;
}

.panel-head,
.sub-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.panel-head h2,
.sub-head h3,
.formula-card h3 {
  margin: 0;
}

.panel-head h2 {
  font-size: 1.15rem;
}

.input-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 18px;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 600;
}

.full-span {
  grid-column: 1 / -1;
}

.input-wrap {
  position: relative;
}

input,
select,
button {
  font: inherit;
}

input,
select {
  width: 100%;
  border: 1px solid rgba(148, 163, 184, 0.16);
  background: rgba(7, 11, 20, 0.55);
  color: var(--text);
  padding: 14px 14px;
  border-radius: 14px;
  outline: none;
  transition: border-color 0.2s ease, transform 0.2s ease, background 0.2s ease;
}

input:focus,
select:focus {
  border-color: rgba(124, 156, 255, 0.6);
  background: rgba(7, 11, 20, 0.75);
}

.suffix {
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
  pointer-events: none;
  font-weight: 600;
}

input[type="number"] {
  padding-right: 44px;
}

.ghost-btn,
.copy-btn {
  border: 1px solid rgba(148, 163, 184, 0.18);
  color: var(--text);
  background: rgba(255,255,255,0.04);
  border-radius: 12px;
  cursor: pointer;
  transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.ghost-btn:hover,
.copy-btn:hover {
  transform: translateY(-1px);
  background: rgba(255,255,255,0.08);
  border-color: rgba(148, 163, 184, 0.32);
}

.ghost-btn {
  padding: 10px 14px;
}

.ghost-btn.small {
  padding: 8px 12px;
  font-size: 0.92rem;
}

.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: 999px;
  color: #d7ffe8;
  background: rgba(69, 208, 184, 0.12);
  border: 1px solid rgba(69, 208, 184, 0.28);
  font-size: 0.82rem;
  font-weight: 700;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.result-card {
  position: relative;
  overflow: hidden;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
}

.result-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  opacity: 0.9;
}

.accent-blue::before { background: var(--blue); }
.accent-purple::before { background: var(--purple); }
.accent-cyan::before { background: var(--cyan); }
.accent-teal::before { background: var(--teal); }
.accent-gold::before { background: var(--gold); }
.accent-pink::before { background: var(--pink); }
.accent-green::before { background: var(--green); }
.accent-orange::before { background: var(--orange); }

.result-label {
  margin: 0 0 8px;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 600;
}

.result-card h3 {
  margin: 0;
  font-size: clamp(1.15rem, 2vw, 1.7rem);
  letter-spacing: -0.03em;
  word-break: break-word;
}

.copy-btn {
  padding: 9px 12px;
  white-space: nowrap;
}

.helper-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 14px;
}

.sub-panel {
  border-radius: var(--radius-lg);
  padding: 16px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.06);
}

.code-block {
  margin: 14px 0 0;
  padding: 14px;
  border-radius: 14px;
  background: rgba(6, 10, 18, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.12);
  color: #dfe6ff;
  min-height: 206px;
  overflow: auto;
  line-height: 1.7;
  white-space: pre-wrap;
}

.recommendation {
  margin-top: 14px;
  color: var(--muted);
  line-height: 1.75;
}

.recommendation strong {
  color: var(--strong);
}

.formulas-panel {
  margin-top: 20px;
}

.formulas-head {
  margin-bottom: 18px;
}

.muted-note {
  color: var(--muted);
  font-size: 0.92rem;
}

.formula-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.formula-card {
  padding: 18px;
  border-radius: var(--radius-lg);
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.06);
}

.formula-card p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.7;
}

.error {
  color: var(--danger);
  font-weight: 600;
}

@media (max-width: 1100px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .hero {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 18px, 1240px);
    padding-top: 14px;
    padding-bottom: 24px;
  }

  .hero-copy,
  .hero-card,
  .panel {
    padding: 18px;
  }

  .input-grid,
  .results-grid,
  .helper-grid,
  .formula-grid {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: clamp(2rem, 9vw, 3rem);
  }
}