: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);
  --canvas-bg: linear-gradient(180deg, #fbfeff, #eef5fa);
  --ray-glow: rgba(255, 255, 255, 0.65);

}

* {
  box-sizing: border-box;
}

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

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

.page-shell {
  max-width: 1700px;
  margin: 0 auto;
  padding: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
}

.hero {
  position: relative;
  padding: 1.2rem 1.4rem;
  margin-bottom: 1rem;
  overflow: hidden;
  background: linear-gradient(160deg, #ffffff, #f7fbfd);
  box-shadow: var(--shadow);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 12px;
  border-radius: 14px 0 0 14px;
  background: var(--accent);
}

.hero-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1rem;
}

.hero-top > :first-child {
  min-width: 0;
  padding-left: 0.4rem;
}

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

.hero h1 {
  font-size: clamp(1.85rem, 2.8vw, 3rem);
  line-height: 1.05;
  margin-bottom: 0;
  margin-top: 0.35rem;
}

.subtitle {
  margin: 0.38rem 0 0;
  color: var(--muted);
  line-height: 1.35;
  max-width: 76ch;
}

.layout {
  display: grid;
  grid-template-columns: minmax(360px, 500px) minmax(0, 1fr);
  gap: 1rem;
}

.controls {
  padding: 1rem;
  display: grid;
  gap: 0.7rem;
  align-content: start;
}

.controls h2,
.controls h3 {
  color: var(--accent-strong);
}

.control-grid {
  display: grid;
  gap: 0.6rem;
}

label {
  display: grid;
  gap: 0.25rem;
  font-size: 0.95rem;
  color: var(--muted);
}

select,
input,
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;
}

select,
input {
  border: 1px solid #a9c4cf;
  border-radius: 8px;
  padding: 0.5rem 0.6rem;
  color: var(--ink);
  background: #f9fdff;
}

body.dark-mode select,
body.dark-mode input {
  border-color: var(--border);
  background: #182231;
  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;
}

body.dark-mode 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;
}

body.dark-mode button.primary {
  background: linear-gradient(160deg, #c8a24a, #d8b767);
  color: #2b1b04;
  border-color: #c8a24a;
}

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

button:focus-visible,
select:focus-visible,
input:focus-visible,
canvas:focus-visible {
  outline: 3px solid #ffad3b;
  outline-offset: 2px;
}

.value {
  font-weight: 700;
  color: var(--accent-strong);
}

.action-row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
}

.action-row.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.status {
  min-height: 2.1rem;
  border-radius: 8px;
  padding: 0.5rem 0.55rem;
  font-size: 0.93rem;
  border: 1px solid var(--border);
  background: #f7fbfd;
  color: var(--ok);
}

.status[data-tone="warn"] {
  color: var(--warn);
  background: #fff7e8;
}

body.dark-mode .status {
  background: #152133;
}

.graph-card {
  padding: 0.9rem;
  display: grid;
  gap: 0.65rem;
}

.subtle {
  color: var(--muted);
}

.graph {
  width: 100%;
  border: 1px solid #b8d1db;
  border-radius: 10px;
  background: var(--canvas-bg);
}

body.dark-mode .graph {
  border-color: var(--border);
}

.big-canvas {
  min-height: 560px;
}

.table-wrap {
  overflow-x: auto;
}

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

th,
td {
  border: 1px solid #d2e2e8;
  padding: 0.5rem;
  text-align: left;
  font-size: 0.9rem;
}

th {
  background: #edf7fb;
}

body.dark-mode th,
body.dark-mode td {
  border-color: var(--border);
}

body.dark-mode th {
  background: #1c2a3f;
}

.explanation {
  display: grid;
  gap: 0.45rem;
}

.explanation p {
  color: var(--muted);
  line-height: 1.38;
}

.help-tabs {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.45rem;
}

.help-tab-btn {
  background: #eef8fc;
}

body.dark-mode .help-tab-btn {
  background: #1a2a3e;
}

.help-tab-btn.active {
  border-color: var(--accent-strong);
  box-shadow: inset 0 0 0 2px rgba(255, 173, 59, 0.35);
}

.help-panel {
  display: none;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #f8fcff;
  padding: 0.55rem 0.6rem;
  color: var(--muted);
  line-height: 1.35;
}

.help-panel p + p {
  margin-top: 0.4rem;
}

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

body.dark-mode .help-panel {
  background: #162236;
}

.highlight {
  color: var(--ink);
  font-weight: 700;
}

.swatch {
  display: inline-block;
  width: 0.9rem;
  height: 0.9rem;
  border-radius: 99px;
  border: 1px solid rgba(255, 255, 255, 0.45);
  margin-right: 0.45rem;
  vertical-align: middle;
}

@media (max-width: 1200px) {
  .layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .page-shell {
    padding: 0.65rem;
  }

  .action-row,
  .action-row.two {
    grid-template-columns: 1fr;
  }

  .help-tabs {
    grid-template-columns: 1fr;
  }

  .big-canvas {
    min-height: 360px;
  }
}