:root {
  --ink: #172331;
  --muted: #617080;
  --paper: #f7fafc;
  --panel: #ffffff;
  --line: #d8e3ea;
  --blue: #2368b8;
  --teal: #0c8f9a;
  --green: #2d8a57;
  --lime: #b6d94c;
  --coral: #e36f5b;
  --shadow: 0 18px 44px rgba(23, 35, 49, 0.13);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    linear-gradient(120deg, rgba(35, 104, 184, 0.10), transparent 35%),
    linear-gradient(240deg, rgba(182, 217, 76, 0.16), transparent 32%),
    var(--paper);
  font-family:
    Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

.shell {
  width: min(1360px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 24px 0;
}

.masthead {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 12px 0 24px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand img {
  width: 56px;
  height: 56px;
  filter: drop-shadow(0 10px 18px rgba(35, 104, 184, 0.25));
}

.eyebrow {
  margin: 0 0 5px;
  color: var(--teal);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 0.98;
  letter-spacing: 0;
}

h2 {
  margin: 0;
  font-size: 1.05rem;
}

h3 {
  margin: 0 0 6px;
  font-size: 1rem;
}

.readout {
  display: grid;
  grid-template-columns: repeat(3, minmax(84px, 1fr));
  gap: 8px;
  min-width: min(380px, 100%);
}

.readout div {
  min-height: 72px;
  padding: 12px;
  border: 1px solid rgba(216, 227, 234, 0.9);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.84);
  box-shadow: 0 10px 24px rgba(23, 35, 49, 0.08);
}

.readout strong {
  display: block;
  font-size: 1.45rem;
  line-height: 1;
}

.readout span {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 800;
}

.layout {
  display: grid;
  grid-template-columns: minmax(270px, 330px) minmax(0, 1fr) minmax(260px, 310px);
  gap: 16px;
  align-items: start;
}

.panel,
.session {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.94);
  box-shadow: var(--shadow);
}

.panel {
  padding: 16px;
}

.session {
  min-height: 620px;
  padding: 18px;
}

.panel-title,
.session-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}

form {
  display: grid;
  gap: 15px;
}

label,
legend {
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 800;
}

label {
  display: grid;
  gap: 7px;
}

select,
input[type="range"] {
  width: 100%;
}

select {
  min-height: 44px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
}

input:focus-visible,
select:focus-visible,
button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 3px rgba(35, 104, 184, 0.2);
}

.range-value {
  color: var(--ink);
  font-weight: 900;
}

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

.segments,
.checks {
  display: grid;
  gap: 8px;
  margin-top: 8px;
}

.segments {
  grid-template-columns: repeat(3, 1fr);
}

.segments label,
.checks label {
  min-height: 42px;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--ink);
  padding: 9px 10px;
}

.checks {
  grid-template-columns: repeat(2, 1fr);
}

.primary,
.secondary {
  min-height: 44px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-weight: 900;
}

.primary {
  background: var(--blue);
  color: #fff;
}

.secondary {
  padding: 0 14px;
  background: #edf6f6;
  color: #176772;
}

.timeline {
  display: grid;
  gap: 12px;
}

.block {
  display: grid;
  grid-template-columns: 86px 1fr;
  gap: 14px;
  min-height: 116px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(12, 143, 154, 0.08), transparent 44%),
    #fff;
}

.duration {
  display: grid;
  min-height: 58px;
  place-items: center;
  border-radius: 8px;
  background: #eff8e5;
  color: #496510;
  font-weight: 950;
}

.block p {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
}

#gear-list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

#gear-list li {
  display: grid;
  grid-template-columns: 24px 1fr;
  align-items: center;
  gap: 10px;
  min-height: 42px;
  padding: 9px 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

#gear-list input {
  width: 18px;
  height: 18px;
  accent-color: var(--green);
}

.status {
  min-height: 22px;
  margin: 16px 0 0;
  color: var(--green);
  font-size: 0.84rem;
  font-weight: 800;
}

@media (max-width: 1120px) {
  .layout {
    grid-template-columns: minmax(270px, 0.8fr) minmax(0, 1.2fr);
  }

  .checklist {
    grid-column: 1 / -1;
  }
}

@media (max-width: 760px) {
  .shell {
    width: min(100vw - 20px, 640px);
    padding-top: 10px;
  }

  .masthead,
  .panel-title,
  .session-head {
    align-items: stretch;
    flex-direction: column;
  }

  .readout,
  .layout,
  .segments,
  .checks {
    grid-template-columns: 1fr;
  }

  .session {
    min-height: auto;
  }

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