:root {
  --bg: #0e1418;
  --bg-accent: #121d24;
  --panel: rgba(10, 18, 23, 0.82);
  --line: rgba(255, 255, 255, 0.08);
  --text: #f4efe5;
  --muted: #9cb0b5;
  --primary: #ff8858;
  --primary-soft: rgba(255, 136, 88, 0.14);
  --secondary: #8ed9c6;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.32);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(255, 136, 88, 0.16), transparent 28%),
    radial-gradient(circle at 88% 18%, rgba(142, 217, 198, 0.16), transparent 20%),
    linear-gradient(135deg, #081015 0%, #11191f 45%, #1c262b 100%);
  font-family: "Space Grotesk", sans-serif;
}

.page-shell {
  width: min(1380px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 40px;
}

.hero {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  margin-bottom: 28px;
}

.hero-copy h1 {
  margin: 10px 0 12px;
  font-size: clamp(2.2rem, 4vw, 4.4rem);
  line-height: 0.96;
  letter-spacing: -0.05em;
  max-width: 12ch;
}

.eyebrow {
  margin: 0;
  font-family: "IBM Plex Mono", monospace;
  color: var(--secondary);
  text-transform: uppercase;
  font-size: 0.8rem;
  letter-spacing: 0.12em;
}

.lede {
  max-width: 720px;
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.hero-badge {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  max-width: 240px;
  justify-content: end;
}

.hero-badge span {
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.83rem;
}

.layout {
  display: grid;
  grid-template-columns: 380px minmax(0, 1fr);
  gap: 18px;
}

.panel {
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(20px);
}

.control-panel,
.result-panel {
  padding: 22px;
}

.preview-panel {
  padding: 22px;
  min-height: 520px;
}

.result-panel {
  grid-column: 1 / -1;
}

.panel-head h2 {
  margin: 0 0 4px;
  font-size: 1.1rem;
}

.panel-head p {
  margin: 0 0 18px;
  color: var(--muted);
}

.field-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.95rem;
}

input,
select,
button,
.download-link {
  font: inherit;
}

input,
select {
  width: 100%;
  padding: 12px 13px;
  border-radius: 14px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
}

button {
  padding: 14px 18px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(135deg, #ff8858, #ffb067);
  color: #15120d;
  font-weight: 700;
  cursor: pointer;
}

.secondary-button {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
}

#status-text {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.84rem;
}

#viewer {
  width: 100%;
  min-height: 430px;
  border-radius: 18px;
  background:
    radial-gradient(circle at 20% 18%, rgba(255, 136, 88, 0.12), transparent 22%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.03), rgba(255, 255, 255, 0.01));
  overflow: hidden;
}

.empty-state {
  padding: 28px;
  border-radius: 18px;
  border: 1px dashed rgba(255, 255, 255, 0.12);
  color: var(--muted);
}

.hidden {
  display: none;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 12px;
}

.metric-card {
  padding: 16px;
  border-radius: 18px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.metric-card strong {
  display: block;
  margin-top: 8px;
  font-size: 1.45rem;
}

.metric-card span {
  color: var(--muted);
  font-size: 0.88rem;
}

.download-row {
  display: flex;
  gap: 12px;
  margin: 18px 0 24px;
  flex-wrap: wrap;
}

.download-link {
  display: inline-flex;
  align-items: center;
  padding: 12px 16px;
  border-radius: 999px;
  text-decoration: none;
  color: #15120d;
  font-weight: 700;
  background: linear-gradient(135deg, #8ed9c6, #c2f3d9);
}

.download-link.subtle {
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.detail-columns {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
}

.simulation-block {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 18px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.solver-block {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  gap: 18px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.solver-actions {
  display: grid;
  gap: 12px;
  align-content: start;
}

.solver-output {
  margin: 0;
  min-height: 120px;
  padding: 14px;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(0, 0, 0, 0.22);
  color: var(--muted);
  white-space: pre-wrap;
  word-break: break-word;
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
}

.detail-columns h3 {
  margin-top: 0;
}

.bullet-list {
  margin: 0;
  padding-left: 18px;
  color: var(--muted);
  line-height: 1.55;
}

.band-list {
  display: grid;
  gap: 10px;
}

.band-row {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) 60px;
  gap: 10px;
  align-items: center;
}

.band-row span {
  color: var(--muted);
  font-family: "IBM Plex Mono", monospace;
  font-size: 0.82rem;
}

.band-bar {
  height: 12px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.06);
}

.band-bar-fill {
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #8ed9c6, #ff8858);
}

@media (max-width: 1024px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .hero {
    flex-direction: column;
    align-items: start;
  }

  .hero-badge {
    justify-content: start;
  }
}

@media (max-width: 760px) {
  .page-shell {
    width: min(100% - 18px, 100%);
    padding-top: 20px;
  }

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

  .simulation-block {
    grid-template-columns: 1fr;
  }

  .solver-block {
    grid-template-columns: 1fr;
  }

  .actions,
  .download-row {
    flex-direction: column;
    align-items: start;
  }
}