@import url("https://fonts.googleapis.com/css2?family=IBM+Plex+Sans:wght@400;500;600;700&display=swap");

:root {

  --bg-950: #e9f4fb;
  --bg-900: #fff4dd;
  --bg-800: #ffffff;
  --text-100: #123140;
  --text-300: #4b6570;
  --gold-500: #0f7e9b;
  --gold-400: #0b5f77;
  --surface: rgba(255, 255, 255, 0.96);
  --border: #c8dbe3;
  --shadow-lg: 0 12px 24px rgba(12, 54, 68, 0.12);

  --bg-top: #e9f4fb;
  --bg-bottom: #fff4dd;
  --card: #ffffff;
  --ink: #123140;
  --muted: #4b6570;
  --accent: #0f7e9b;
  --accent-strong: #095f76;
  --warm: #d67b19;
  --ok: #1a7f4e;
  --warn: #9a5d00;
  --border: #c8dbe3;
  --shadow: 0 12px 24px rgba(12, 54, 68, 0.12);

}



* {
  box-sizing: border-box;
}

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

body {
  font-family: "Inter", "IBM Plex Sans", sans-serif;
  color: var(--text-100);
  background: #e9f4fb;
  line-height: 1.45;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(18, 49, 64, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18, 49, 64, 0.05) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at center, #000 44%, transparent 96%);
}

h1,
h2,
h3,
h4,
p,
dl,
dt,
dd,
summary,
ul,
li {
  margin: 0;
}

.shell {
  width: min(1500px, calc(100% - 1.2rem));
  margin-inline: auto;
}

.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 0.8rem;
}

.hero {
  margin-top: 1rem;
  border: 1px solid var(--border);
  border-left: 8px solid var(--accent);
  border-radius: 14px;
  padding: 1.1rem 1.2rem;
  background: var(--card);
  box-shadow: var(--shadow);
}

.kicker {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.09em;
  color: var(--accent-strong);
  font-weight: 700;
}

.hero h1 {
  margin-top: 0.24rem;
  font-size: clamp(1.4rem, 2.4vw, 2.2rem);
}

.subtitle {
  margin-top: 0.4rem;
  max-width: 88ch;
  color: var(--muted);
}

.app-layout {
  margin-top: 0.95rem;
  margin-bottom: 1.6rem;
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  align-items: start;
}

.panel {
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  background: var(--surface);
  box-shadow: 0 6px 16px rgba(12, 54, 68, 0.08);
}

.narrow {
  grid-column: span 4;
}

.wide {
  grid-column: span 8;
}

.full {
  grid-column: span 12;
}

.hint,
.info-line {
  margin-top: 0.34rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.controls-grid {
  margin-top: 0.65rem;
  display: grid;
  gap: 0.62rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.36rem;
  font-size: 0.91rem;
  color: var(--muted);
}

input,
button,
canvas {
  font: inherit;
}

input[type="number"],
input[type="range"] {
  border: 1px solid #a9c4cf;
  border-radius: 8px;
  background: #f9fdff;
  color: var(--ink);
  padding: 0.46rem 0.56rem;
}

input[type="range"] {
  padding: 0;
  accent-color: var(--accent);
}

input[type="checkbox"] {
  accent-color: var(--accent);
}

.range-label {
  margin-top: 0.7rem;
}

.toggle-group {
  margin-top: 0.7rem;
  display: grid;
  gap: 0.68rem;
}

.toggle-line {
  flex-direction: row;
  align-items: center;
  gap: 0.56rem;
  color: var(--ink);
}

button {
  border-radius: 10px;
  background: linear-gradient(160deg, #0d839f, #0b5f77);
  color: #ffffff;
  font-weight: 700;
  border: 1px solid #0a5d74;
  padding: 0.58rem 0.82rem;
  cursor: pointer;
}

button.primary {
  background: linear-gradient(160deg, #0d839f, #0b5f77);
  color: #fff;
  border-color: #0a5d74;
}

button.ghost {
  background: #eef8fb;
  color: var(--accent-strong);
  border-color: #0d839f;
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

button:focus-visible,
input:focus-visible,
.tab-btn:focus-visible {
  outline: 3px solid #ffad3b;
  outline-offset: 2px;
}

.button-row {
  margin-top: 0.78rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.button-row.compact {
  margin-top: 0.45rem;
}

.status {
  margin-top: 0.7rem;
  min-height: 2.55rem;
  padding: 0.55rem 0.62rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #f7fbfd;
  color: var(--ink);
  font-size: 0.92rem;
}

.status.warn {
  color: var(--warn);
  background: #fff7e8;
  border-color: #f3d49f;
}

.preset-box {
  margin-top: 0.9rem;
  padding-top: 0.7rem;
  border-top: 1px solid var(--border);
}

.preset-box h3 {
  font-size: 1.05rem;
}

.panel-head {
  display: grid;
  gap: 0.22rem;
}

.sim-canvas {
  margin-top: 0.65rem;
  width: 100%;
  display: block;
  aspect-ratio: 980 / 520;
  border-radius: 10px;
  border: 1px solid #b8d1db;
  background: linear-gradient(180deg, #f8fcff, #f2f8fb);
}

.metrics-grid {
  margin-top: 0.7rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.55rem;
}

.metrics-grid div {
  border: 1px solid #b8d1db;
  border-radius: 10px;
  padding: 0.5rem 0.55rem;
  background: linear-gradient(170deg, #f7fcff, #f1f9fd);
}

.metrics-grid dt {
  font-size: 0.74rem;
  color: #61808b;
  text-transform: uppercase;
  letter-spacing: 0.07em;
}

.metrics-grid dd {
  margin-top: 0.2rem;
  font-size: 0.95rem;
}

.tab-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.tab-btn {
  background: #edf7fb;
  color: var(--accent-strong);
  border-color: #7fb5c4;
}

.tab-btn.active {
  background: linear-gradient(160deg, #0d839f, #0b5f77);
  color: #fff;
  border-color: #0a5d74;
}

.tab-panel {
  display: none;
  margin-top: 0.75rem;
  color: var(--muted);
}

.tab-panel.active {
  display: block;
}

.tab-panel h2 {
  margin-bottom: 0.55rem;
  color: var(--ink);
}

details {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #f7fcff;
  padding: 0.58rem 0.62rem;
}

details + details {
  margin-top: 0.44rem;
}

summary {
  cursor: pointer;
  color: var(--accent-strong);
  font-weight: 700;
}

details p {
  margin-top: 0.4rem;
}

.table-wrap {
  margin-top: 0.6rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
}

th,
td {
  border: 1px solid #d2e2e8;
  padding: 0.45rem 0.5rem;
  font-size: 0.86rem;
  text-align: left;
}

th {
  background: #edf7fb;
}

@media (max-width: 1150px) {
  .narrow,
  .wide {
    grid-column: span 12;
  }
}

@media (max-width: 860px) {
  .metrics-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 680px) {
  .shell {
    width: min(1500px, calc(100% - 0.6rem));
  }

  .hero {
    padding: 0.85rem 0.9rem;
  }

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

  .controls-grid,
  .metrics-grid {
    grid-template-columns: 1fr;
  }

  .button-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .tab-nav {
    display: grid;
    grid-template-columns: 1fr;
  }
}