:root {
  color-scheme: light;
  --bg: #f7fbff;
  --surface: #ffffff;
  --surface-soft: #eef6ff;
  --text: #0f2347;
  --muted: #5c6f8f;
  --line: #d9e7fb;
  --blue: #1368ff;
  --blue-dark: #0c43b8;
  --blue-soft: #dceaff;
  --cyan: #2fc7ff;
  --shadow: 0 24px 70px rgba(19, 104, 255, 0.14);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 18% 10%, rgba(19, 104, 255, 0.12), transparent 34rem),
    radial-gradient(circle at 82% 0%, rgba(47, 199, 255, 0.18), transparent 28rem),
    var(--bg);
  color: var(--text);
}
a { color: inherit; text-decoration: none; }

.hero { min-height: 82vh; padding: 24px clamp(18px, 5vw, 72px) 72px; }
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 24px;
  max-width: 1220px;
  margin: 0 auto 70px;
}
.brand { display: inline-flex; align-items: center; gap: 12px; color: var(--blue-dark); font-weight: 800; font-size: 1.1rem; }
.brand-mark { display: grid; place-items: center; width: 38px; height: 38px; border-radius: 14px; background: linear-gradient(135deg, var(--blue), var(--cyan)); color: white; }
.nav-links { display: flex; gap: 24px; color: var(--muted); font-weight: 700; }
.nav-links a:hover { color: var(--blue); }

.hero-grid { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(320px, 0.85fr); gap: clamp(28px, 6vw, 84px); align-items: center; max-width: 1220px; margin: 0 auto; }
.eyebrow { color: var(--blue); text-transform: uppercase; letter-spacing: 0.16em; font-size: 0.78rem; font-weight: 800; }
h1, h2, h3, p { margin-top: 0; }
h1 { font-size: clamp(3rem, 7vw, 6.7rem); line-height: 0.9; letter-spacing: -0.075em; margin-bottom: 24px; }
h2 { font-size: clamp(2rem, 4vw, 4.1rem); line-height: 1; letter-spacing: -0.055em; margin-bottom: 14px; }
h3 { letter-spacing: -0.02em; }
.lede { max-width: 690px; color: var(--muted); font-size: clamp(1.06rem, 2vw, 1.3rem); line-height: 1.65; }
.hero-actions, .control-row { display: flex; flex-wrap: wrap; gap: 14px; }
.button { border: 0; border-radius: 999px; padding: 13px 20px; font-weight: 800; cursor: pointer; display: inline-flex; justify-content: center; align-items: center; }
.button.primary { background: var(--blue); color: #fff; box-shadow: 0 14px 34px rgba(19, 104, 255, 0.25); }
.button.secondary, .button.ghost { background: #fff; color: var(--blue-dark); border: 1px solid var(--line); }

.stat-card, .panel, .feature-strip article, .formula-grid article, .privacy-section {
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}
.stat-card { border-radius: 34px; padding: 28px; }
.card-header, .mini-stats, .chart-title { display: flex; justify-content: space-between; gap: 18px; align-items: center; color: var(--muted); }
.card-header strong { color: var(--blue); font-size: 1.7rem; }
.pulse-chart { display: grid; grid-template-columns: repeat(5, 1fr); align-items: end; gap: 12px; height: 240px; margin: 28px 0; padding: 22px; border-radius: 28px; background: linear-gradient(180deg, var(--surface-soft), #fff); border: 1px solid var(--line); }
.pulse-chart span { display: block; min-height: 38px; border-radius: 999px 999px 12px 12px; background: linear-gradient(180deg, var(--cyan), var(--blue)); box-shadow: 0 10px 24px rgba(19,104,255,0.2); }
.pulse-chart span:nth-child(1) { height: 38%; }
.pulse-chart span:nth-child(2) { height: 62%; }
.pulse-chart span:nth-child(3) { height: 82%; }
.pulse-chart span:nth-child(4) { height: 56%; }
.pulse-chart span:nth-child(5) { height: 72%; }
.mini-stats b { color: var(--blue); }

main { padding: 0 clamp(18px, 5vw, 72px) 56px; }
.feature-strip, .formula-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; max-width: 1220px; margin: 0 auto 96px; }
.feature-strip article, .formula-grid article { border-radius: 26px; padding: 26px; }
.icon { width: 44px; height: 44px; display: grid; place-items: center; border-radius: 15px; background: var(--blue-soft); color: var(--blue); font-size: 1.5rem; font-weight: 900; }
article p, .section-heading p, .privacy-list { color: var(--muted); line-height: 1.65; }

.workspace, .math-section, .privacy-section { max-width: 1220px; margin: 0 auto 96px; }
.section-heading { margin-bottom: 28px; }
.narrow { max-width: 760px; }
.tracker-layout { display: grid; grid-template-columns: 390px 1fr; gap: 20px; align-items: start; }
.absorption-layout { grid-template-columns: 460px 1fr; }
.panel { border-radius: 30px; padding: 24px; }
.controls { display: grid; gap: 18px; }
.two-column { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
.three-column { display: grid; grid-template-columns: 1.1fr 0.95fr 0.8fr; gap: 14px; }
label { display: grid; gap: 8px; color: #183964; font-weight: 750; }
input, select { width: 100%; border: 1px solid var(--line); background: #fff; color: var(--text); border-radius: 14px; padding: 12px 13px; font: inherit; box-shadow: 0 1px 0 rgba(15,35,71,0.03); }
input:focus, select:focus { outline: 3px solid rgba(19,104,255,0.15); border-color: var(--blue); }
input[type="range"] { accent-color: var(--blue); padding: 0; box-shadow: none; }
.range-value { color: var(--muted); font-weight: 700; }
.metric-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 18px; }
.metric-grid article { background: linear-gradient(180deg, var(--surface-soft), #fff); border: 1px solid var(--line); border-radius: 20px; padding: 18px; min-width: 0; }
.metric-grid span, .metric-grid small { color: var(--muted); }
.metric-grid strong { display: block; font-size: clamp(1.35rem, 2.5vw, 2.25rem); margin: 8px 0 4px; color: var(--blue); letter-spacing: -0.06em; overflow-wrap: anywhere; }
.chart-card { background: #fff; border: 1px solid var(--line); border-radius: 24px; padding: 18px; }
canvas { width: 100%; max-width: 100%; height: auto; }
code { display: block; background: #eff6ff; color: var(--blue-dark); padding: 14px; border-radius: 14px; overflow-x: auto; }
.privacy-section { display: grid; grid-template-columns: 1fr 1.1fr; gap: 32px; border-radius: 32px; padding: clamp(24px, 5vw, 48px); }
.privacy-list { margin: 0; padding-left: 20px; }
.privacy-list li + li { margin-top: 14px; }
footer { color: var(--muted); text-align: center; padding: 32px 18px 48px; }

@media (max-width: 1000px) {
  .hero-grid, .tracker-layout, .absorption-layout, .privacy-section { grid-template-columns: 1fr; }
  .feature-strip, .formula-grid, .metric-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 680px) {
  .nav-links { display: none; }
  .feature-strip, .formula-grid, .metric-grid, .two-column, .three-column { grid-template-columns: 1fr; }
  h1 { font-size: 3rem; }
  .hero { min-height: auto; }
}
textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--text);
  border-radius: 14px;
  padding: 12px 13px;
  font: inherit;
  resize: vertical;
  min-height: 104px;
  box-shadow: 0 1px 0 rgba(15,35,71,0.03);
}
textarea:focus { outline: 3px solid rgba(19,104,255,0.15); border-color: var(--blue); }
.field-note, .time-context { color: var(--muted); line-height: 1.55; margin: -4px 0 0; font-size: 0.92rem; }
.time-context { margin: -4px 0 14px; }
.time-section { margin-bottom: 32px; }
.node-editor {
  display: grid;
  grid-template-columns: minmax(90px, 1fr) minmax(110px, 1fr) auto;
  gap: 12px;
  align-items: end;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: linear-gradient(180deg, var(--surface-soft), #fff);
}
.node-editor .button { min-height: 46px; white-space: nowrap; }
@media (max-width: 680px) {
  .node-editor { grid-template-columns: 1fr; }
}
.absorption-layout {
  grid-template-columns: minmax(360px, 520px) minmax(0, 1fr);
}
.absorption-layout .controls { overflow: hidden; }
.absorption-layout .three-column {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}
.absorption-layout label,
.absorption-layout input,
.absorption-layout select,
.absorption-layout textarea,
.absorption-layout .node-editor { min-width: 0; }
.absorption-layout .metric-grid strong {
  font-size: clamp(1.55rem, 2.1vw, 2.6rem);
  letter-spacing: -0.04em;
}
.absorption-layout .metric-grid article { overflow: hidden; }
@media (max-width: 1180px) {
  .absorption-layout { grid-template-columns: 1fr; }
}
@media (max-width: 680px) {
  .absorption-layout .three-column { grid-template-columns: 1fr; }
}
.absorption-metrics strong {
  overflow-wrap: normal;
  word-break: normal;
  line-height: 1.08;
}
@media (max-width: 1320px) {
  .absorption-layout .metric-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
/* Compact absorption controls: nodes are the single source of graph instances. */
.absorption-layout {
  grid-template-columns: minmax(320px, 440px) minmax(0, 1fr);
}
.absorption-layout .panel { padding: 20px; }
.absorption-layout .controls { gap: 12px; }
.absorption-layout label { gap: 6px; font-size: 0.94rem; }
.absorption-layout input,
.absorption-layout select,
.absorption-layout textarea {
  border-radius: 12px;
  padding: 10px 11px;
  font-size: 0.95rem;
}
.absorption-layout textarea { min-height: 86px; }
.absorption-layout .two-column,
.absorption-layout .three-column,
.absorption-layout .compact-options {
  gap: 10px;
}
.absorption-node-editor {
  grid-template-columns: minmax(120px, 1.2fr) minmax(64px, 0.7fr) minmax(74px, 0.7fr) minmax(92px, 0.9fr);
}
.absorption-node-editor .button { grid-column: 1 / -1; }
@media (max-width: 760px) {
  .absorption-node-editor { grid-template-columns: 1fr 1fr; }
  .absorption-node-editor .button { grid-column: 1 / -1; }
}
@media (max-width: 520px) {
  .absorption-node-editor { grid-template-columns: 1fr; }
}
/* Seamless form/layout fixes */
.workspace { overflow: hidden; }
.tracker-layout {
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
}
.panel,
.controls,
.controls label,
.chart-card,
.dashboard { min-width: 0; }
.controls { overflow: hidden; }
input,
select,
textarea {
  max-width: 100%;
  min-width: 0;
}
textarea::placeholder,
input::placeholder { color: rgba(15, 35, 71, 0.48); }
.node-editor {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  overflow: hidden;
}
.node-editor .button {
  grid-column: 1 / -1;
  width: 100%;
  min-width: 0;
}
.chart-card canvas {
  display: block;
  min-height: 260px;
}
.workspace .section-heading h2 {
  font-size: clamp(2.1rem, 5vw, 5rem);
  line-height: 0.96;
}
@media (max-width: 1180px) {
  .tracker-layout { grid-template-columns: 1fr; }
}
@media (max-width: 520px) {
  .node-editor { grid-template-columns: 1fr; }
}
/* Larger, click-to-add graph surfaces */
.chart-card {
  padding: clamp(20px, 2.4vw, 30px);
}
.chart-card canvas {
  min-height: clamp(340px, 42vw, 520px);
  cursor: crosshair;
}
.dashboard .chart-card { margin-top: 8px; }
.tracker-layout {
  grid-template-columns: minmax(280px, 340px) minmax(0, 1fr);
  gap: clamp(18px, 2.4vw, 32px);
}
@media (max-width: 1180px) {
  .chart-card canvas { min-height: 360px; }
}
/* Click-to-add graph point modal */
.graph-modal[hidden] { display: none; }
.graph-modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 24px;
  background: rgba(15, 35, 71, 0.28);
  backdrop-filter: blur(10px);
}
.graph-modal-card {
  width: min(680px, 100%);
  display: grid;
  gap: 18px;
  padding: clamp(22px, 4vw, 32px);
  border: 1px solid var(--line);
  border-radius: 28px;
  background: rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow);
}
.graph-modal-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.7fr 0.7fr 1fr;
  gap: 12px;
}
.small-button { padding: 9px 14px; font-size: 0.9rem; }
@media (max-width: 720px) {
  .graph-modal-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 480px) {
  .graph-modal-grid { grid-template-columns: 1fr; }
}
/* Seamless click-first graph input guidance */
.chart-helper {
  margin: 4px 0 14px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, var(--surface-soft), #fff);
  color: var(--muted);
  font-weight: 700;
  line-height: 1.45;
}
.graph-modal-card input {
  min-height: 48px;
}
.graph-modal-card .field-note {
  margin: -6px 0 0;
  padding: 10px 12px;
  border-radius: 14px;
  background: var(--surface-soft);
}
.chart-controls {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  gap: 10px;
  margin: 0 0 14px;
}
.chart-controls label {
  min-width: 150px;
  color: var(--muted);
  font-size: 0.9rem;
}
.chart-controls select { padding: 9px 11px; }
.coffee-link {
  color: var(--blue-dark);
  font-weight: 900;
}
.coffee-footer { margin-top: 10px; }
.scale-status {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--blue-soft);
  color: var(--blue-dark);
  font-weight: 900;
  font-size: 0.9rem;
}