:root {
  --bg: #f4f7fb;
  --panel: #ffffff;
  --ink: #1f2937;
  --accent: #0f766e;
  --accent-dark: #115e59;
  --border: #d1d5db;
  --soft-accent: #e8f8f5;
  --soft-accent-2: #f3fbfa;
  --error: #991b1b;
  --ok: #166534;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(120deg, #f8fafc, #edf4ff);
  color: var(--ink);
}

.page {
  width: min(1100px, 94vw);
  margin: 24px auto 16px auto;
  display: grid;
  gap: 18px;
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
  box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.hero {
  background: rgba(255, 253, 248, 0.72);
  border: 1px solid var(--border);
  border-radius: 1.2rem;
  padding: 0.85rem 1.45rem 1.35rem;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.07);
}

h1,
h2,
h3 {
  margin-top: 0;
}

.eyebrow {
  margin: 0;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.76rem;
  font-weight: 700;
}

.hero .eyebrow {
  color: var(--accent);
}

.hero h1 {
  margin: 0.25rem 0 0;
  font-weight: 500;
  letter-spacing: -0.02em;
  font-size: clamp(1.75rem, 3vw, 2.2rem);
}

.hero p {
  margin: 0.55rem 0 0;
  line-height: 1.52;
  color: #334155;
}

form {
  display: grid;
  gap: 14px;
}

.mode-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.mode-picker label {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  border: 1px solid var(--border);
  background: #ffffff;
  border-radius: 999px;
  padding: 0.45rem 0.85rem;
  cursor: pointer;
  transition: transform 0.15s ease, border-color 0.2s ease;
  white-space: nowrap;
}

.mode-picker label:has(input:checked) {
  border-color: var(--accent);
  transform: translateY(-1px);
  background: var(--soft-accent);
}

.mode-picker label span {
  white-space: nowrap;
}

.input-block {
  display: grid;
  gap: 8px;
}

textarea,
input,
button {
  font: inherit;
}

textarea,
input {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px;
  background: #ffffff;
  color: var(--ink);
}

input:focus,
textarea:focus,
button:focus-visible {
  outline: 2px solid rgba(15, 118, 110, 0.24);
  outline-offset: 2px;
}

button {
  width: fit-content;
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: white;
  cursor: pointer;
  font-weight: 700;
}

button:hover {
  filter: brightness(1.06);
}

.error {
  margin-top: 8px;
  border: 1px solid #fecaca;
  border-radius: 10px;
  padding: 10px;
  background: #fef2f2;
  color: #991b1b;
}

.results {
  display: grid;
  gap: 14px;
  animation: rise 0.35s ease;
}

.results h2 {
  margin: 0;
}

.step {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 12px;
  background: #f8fafc;
}

.latex-inline {
  margin: 6px 0;
}

.latex-block {
  overflow-x: auto;
}

.vars {
  margin: 0;
  color: #475569;
}

.final-section {
  margin-top: 8px;
  display: grid;
  gap: 8px;
}

.final-title {
  font-size: 1.2rem;
}

.final-matrix {
  margin-top: -2px;
}

.report-actions {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin-top: 0.3rem;
}

.report-print-btn {
  border: 1px solid #99d5cf;
  border-radius: 10px;
  padding: 0.58rem 1rem;
  background: linear-gradient(135deg, var(--soft-accent), var(--soft-accent-2));
  color: var(--accent);
  font-size: 0.96rem;
  font-weight: 600;
  cursor: pointer;
}

.report-print-btn:hover {
  filter: none;
  background: linear-gradient(135deg, #ddf4f0, #eefaf8);
}

.copyright {
  width: min(1100px, 94vw);
  margin: 0 auto 24px auto;
  text-align: center;
  color: #475569;
  font-size: 0.95rem;
}

.copyright a {
  color: inherit;
  text-decoration: none;
}

.copyright a:hover {
  color: var(--accent);
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 720px) {
  .page {
    width: 96vw;
    margin-top: 14px;
  }

  .copyright {
    width: 96vw;
  }

  .panel {
    padding: 14px;
  }

  .hero {
    padding: 14px;
  }
}

@media print {
  body {
    background: #ffffff;
  }

  .no-print {
    display: none !important;
  }
}