@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-950: #e9f4fb;
  --bg-900: #fff4dd;
  --bg-800: #ffffff;
  --text-100: #123140;
  --text-300: #4b6570;
  --text-500: #a9b2c3;
  --gold-500: #0f7e9b;
  --gold-400: #0b5f77;
  --gold-300: #e5cc8f;

  --surface: rgba(255, 255, 255, 0.96);
  --surface-alt: rgba(247, 252, 255, 0.98);
  --border: #c8dbe3;
  --shadow-lg: 0 12px 24px rgba(12, 54, 68, 0.12);

  --app-bg:
    radial-gradient(1200px 700px at 8% 2%, rgba(19, 143, 176, 0.18), transparent 62%),
    radial-gradient(900px 600px at 92% 98%, rgba(220, 132, 32, 0.18), transparent 66%),
    linear-gradient(165deg, #e9f4fb, #fff4dd);
  --hero-bg: linear-gradient(160deg, #ffffff, #f7fbfd);
  --hero-text: #123140;

  --graph-bg: linear-gradient(180deg, #f8fcff, #f2f8fb);
  --canvas-border: #b8d1db;
  --table-head: #edf7fb;

}



*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
  color: var(--text-100);
  background: var(--app-bg);
  line-height: 1.45;
  overflow-x: hidden;
}

.bg-grid {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-image:
    linear-gradient(rgba(229, 204, 143, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(229, 204, 143, 0.06) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at center, black 42%, transparent 95%);
}

h1,
h2,
h3,
h4 {
  margin: 0;
  font-family: "IBM Plex Sans", "Segoe UI", sans-serif;
}

.shell {
  width: min(1520px, calc(100% - 2rem));
  margin-inline: auto;
}

.hero {
  margin-top: 1.25rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.2rem 1.4rem;
  padding-right: 12rem;
  background: var(--hero-bg);
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 10px;
  background: var(--gold-500);
}

.kicker {
  margin: 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gold-400);
  font-weight: 700;
}

.hero h1 {
  margin-top: 0.3rem;
  font-size: clamp(1.65rem, 2.3vw, 2.8rem);
  line-height: 1.08;
  color: var(--hero-text);
  overflow-wrap: anywhere;
}

.subtitle {
  margin: 0.34rem 0 0;
  color: var(--text-300);
  max-width: 84ch;
}

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

.hero-top > :first-child {
  flex: 1 1 auto;
  min-width: 0;
  padding-left: 0.35rem;
}

.app-layout {
  margin-top: 1rem;
  margin-bottom: 2rem;
  display: grid;
  gap: 0.9rem;
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.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);
}

.full {
  grid-column: span 12;
}

.wide {
  grid-column: span 8;
}

.narrow {
  grid-column: span 4;
}

.inquiry-grid {
  margin-top: 0.75rem;
  display: grid;
  gap: 0.7rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.inquiry-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.72rem;
  background: var(--surface-alt);
}

.inquiry-card h3 {
  font-size: 1.06rem;
  margin-bottom: 0.3rem;
}

.inquiry-card p {
  margin: 0;
  color: var(--text-300);
}

.sim-toolbar {
  margin-top: 0.45rem;
}

.hint {
  margin: 0.5rem 0 0;
  color: var(--text-300);
  font-size: 0.92rem;
  white-space: pre-line;
}

.sim-canvas {
  margin-top: 0.62rem;
  width: 100%;
  display: block;
  border: 1px solid var(--canvas-border);
  border-radius: 12px;
  background: var(--graph-bg);
}

.table-wrap {
  margin-top: 0.55rem;
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 660px;
}

th,
td {
  border: 1px solid var(--border);
  padding: 0.45rem 0.5rem;
  text-align: left;
  font-size: 0.82rem;
}

th {
  background: var(--table-head);
}

label {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  color: var(--text-300);
  font-size: 0.92rem;
}

input,
select,
button,
output {
  font: inherit;
}

input,
select,
output {
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-alt);
  color: var(--text-100);
  padding: 0.55rem 0.62rem;
}

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.ghost {
  background: rgba(200, 162, 74, 0.11);
  color: var(--text-100);
}

button:hover:not(:disabled) {
  filter: brightness(1.05);
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

button:focus-visible,
input:focus-visible,
select:focus-visible {
  outline: 2px solid var(--gold-400);
  outline-offset: 2px;
}

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

.control-span-2 {
  grid-column: span 2;
}

.range-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 70px;
  align-items: center;
  gap: 0.48rem;
}

.range-row output {
  text-align: center;
  padding: 0.42rem 0.35rem;
}

.button-row {
  margin-top: 0.72rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.metric-grid {
  margin-top: 0.64rem;
  display: grid;
  gap: 0.5rem;
}

.metric-card {
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.62rem;
  background: var(--surface-alt);
}

.metric-card h4 {
  margin: 0;
  font-size: 1.01rem;
}

.metric-card p {
  margin: 0.24rem 0 0;
  color: var(--text-300);
  font-size: 0.88rem;
}

.diagram-layout {
  margin-top: 0.7rem;
  display: grid;
  gap: 0.8rem;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
}

.diagram-controls {
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-alt);
  padding: 0.72rem;
  display: grid;
  gap: 0.58rem;
  align-content: start;
}

.diagram-board-wrap {
  min-width: 0;
}

.diagram-list-wrap {
  margin-top: 0.6rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface-alt);
  padding: 0.62rem;
}

.diagram-list-wrap h3 {
  margin: 0;
  font-size: 1rem;
}

.diagram-list {
  margin: 0.45rem 0 0;
  padding-left: 1.1rem;
}

.diagram-list li {
  margin: 0.2rem 0;
  color: var(--text-300);
  font-size: 0.9rem;
}

@media (max-width: 1180px) {
  .wide,
  .narrow {
    grid-column: span 12;
  }

  .diagram-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .shell {
    width: min(1520px, calc(100% - 1rem));
  }

  .hero {
    padding-right: 1rem;
  }

  .hero-top {
    flex-direction: column;
  }

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

  .control-span-2 {
    grid-column: span 1;
  }

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

  .button-row {
    flex-direction: column;
    align-items: stretch;
  }
}