:root {
  color-scheme: dark;
  --bg: #05080d;
  --panel: rgba(13, 21, 31, 0.9);
  --surface: rgba(18, 27, 38, 0.78);
  --line: rgba(165, 190, 214, 0.16);
  --text: #f7f9fc;
  --muted: #a9b7c6;
  --soft: #d8e1ec;
  --cyan: #75e8ff;
  --mint: #88f5bf;
  --amber: #f5cb69;
  --rose: #ff8997;
  --max: 1460px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  min-width: 320px;
  margin: 0;
  overflow-x: hidden;
  color: var(--text);
  background:
    radial-gradient(circle at 18% 0%, rgba(117, 232, 255, 0.16), transparent 30rem),
    radial-gradient(circle at 88% 16%, rgba(136, 245, 191, 0.1), transparent 28rem),
    linear-gradient(180deg, #04070b 0%, #07111b 52%, #05080d 100%);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  content: "";
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.026) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.026) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.86), transparent 88%);
}

a {
  color: inherit;
  text-decoration: none;
}

svg {
  width: 19px;
  height: 19px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}

h1,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 10px;
  font-size: clamp(30px, 3.6vw, 50px);
  line-height: 0.98;
  letter-spacing: 0;
}

p {
  margin-bottom: 0;
  color: var(--muted);
  line-height: 1.42;
}

.top-command {
  position: sticky;
  top: 0;
  z-index: 20;
  display: grid;
  grid-template-columns: minmax(240px, 1fr) auto auto;
  gap: 14px;
  align-items: center;
  padding: 12px max(14px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.012)),
    rgba(4, 7, 11, 0.9);
  backdrop-filter: blur(18px);
}

.brand,
.top-nav,
.ghost-btn {
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.018)),
    rgba(11, 17, 24, 0.78);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.04);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  width: fit-content;
  min-height: 50px;
  padding: 7px 14px 7px 8px;
  border-radius: 8px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 1px solid rgba(117, 232, 255, 0.36);
  border-radius: 50%;
  color: var(--cyan);
  background: rgba(117, 232, 255, 0.09);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 14px;
  letter-spacing: 0.02em;
}

.brand small {
  margin-top: 3px;
  color: var(--muted);
  font-size: 12px;
}

.top-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
  padding: 4px;
  border-radius: 999px;
}

.top-nav a,
.ghost-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  min-height: 38px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 780;
  transition: 160ms ease;
}

.top-nav a {
  padding: 0 13px;
  border: 1px solid transparent;
}

.top-nav a:hover,
.top-nav a.is-active {
  border-color: rgba(117, 232, 255, 0.34);
  color: var(--text);
  background: rgba(117, 232, 255, 0.1);
}

.ghost-btn {
  padding: 0 15px;
}

.playbook-shell,
.footer {
  width: min(calc(100% - 28px), var(--max));
  margin-inline: auto;
}

.playbook-shell {
  padding: 14px 0 0;
}

.page {
  display: none;
  min-height: calc(100svh - 104px);
  padding: clamp(16px, 2vw, 28px);
  border: 1px solid var(--line);
  border-radius: 14px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.018)),
    radial-gradient(circle at 18% 0%, rgba(117, 232, 255, 0.085), transparent 24rem),
    repeating-linear-gradient(135deg, rgba(255, 255, 255, 0.014) 0 1px, transparent 1px 9px),
    var(--panel);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.04),
    0 18px 54px rgba(0, 0, 0, 0.24);
}

.page.is-active {
  display: block;
}

.page-title {
  max-width: 920px;
  margin: 0 auto 18px;
}

.page-title > p:last-child {
  max-width: 720px;
  color: var(--soft);
  font-size: 16px;
}

.eyebrow,
.flow-step > span {
  color: var(--cyan);
  font-size: 12px;
  font-weight: 880;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.eyebrow {
  margin: 0 0 8px;
}

.guide-flow {
  display: grid;
  gap: 22px;
  width: min(100%, 920px);
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.guide-flow.deep-flow {
  width: min(100%, 980px);
}

.flow-step {
  position: relative;
  min-height: 108px;
  padding: 16px 18px 16px 22px;
  border: 1px solid rgba(117, 232, 255, 0.22);
  border-radius: 8px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.016)),
    var(--surface);
  box-shadow:
    inset 0 1px 0 rgba(255, 255, 255, 0.035),
    0 12px 34px rgba(0, 0, 0, 0.16);
}

.flow-step:not(:last-child)::after {
  position: absolute;
  left: 50%;
  bottom: -20px;
  color: var(--cyan);
  content: "v";
  font-size: 16px;
  font-weight: 900;
  transform: translateX(-50%);
}

.flow-step strong {
  display: block;
  margin: 8px 0 6px;
  color: var(--text);
  font-size: 18px;
  line-height: 1.18;
}

.flow-step p {
  color: var(--soft);
  font-size: 14px;
}

.flow-step.info {
  border-color: rgba(117, 232, 255, 0.2);
}

.flow-step.action {
  border-color: rgba(117, 232, 255, 0.26);
}

.flow-step.gate {
  border-color: rgba(117, 232, 255, 0.34);
  background:
    linear-gradient(180deg, rgba(117, 232, 255, 0.1), rgba(255, 255, 255, 0.016)),
    var(--surface);
}

.flow-step.recommend {
  border-color: rgba(136, 245, 191, 0.34);
  background:
    linear-gradient(180deg, rgba(136, 245, 191, 0.09), rgba(255, 255, 255, 0.016)),
    var(--surface);
}

.flow-step.caution {
  border-color: rgba(245, 203, 105, 0.38);
  background:
    linear-gradient(180deg, rgba(245, 203, 105, 0.09), rgba(255, 255, 255, 0.016)),
    var(--surface);
}

.flow-step.stop {
  border-color: rgba(255, 137, 151, 0.38);
  background:
    linear-gradient(180deg, rgba(255, 137, 151, 0.09), rgba(255, 255, 255, 0.016)),
    var(--surface);
}

.branch-list {
  display: grid;
  gap: 8px;
  margin-top: 12px;
}

.branch-list b {
  position: relative;
  display: block;
  min-height: 34px;
  padding: 8px 10px 8px 34px;
  border: 1px solid rgba(117, 232, 255, 0.18);
  border-radius: 8px;
  color: var(--soft);
  font-size: 13px;
  line-height: 1.22;
  background: rgba(4, 9, 14, 0.45);
}

.branch-list b::before {
  position: absolute;
  left: 12px;
  color: var(--cyan);
  content: ">";
  font-weight: 900;
}

.footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 4px 36px;
}

.footer p {
  font-size: 14px;
}

@media (max-width: 1240px) {
  .top-command {
    grid-template-columns: 1fr;
  }

  .brand,
  .ghost-btn {
    width: 100%;
  }

  .top-nav {
    justify-content: flex-start;
    border-radius: 12px;
  }
}

@media (max-width: 760px) {
  .top-command {
    position: static;
    padding: 10px;
  }

  .top-nav {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    width: 100%;
    min-width: 0;
    justify-content: stretch;
    justify-items: stretch;
  }

  .top-nav a {
    width: 100%;
    min-width: 0;
    padding: 0 10px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .playbook-shell,
  .footer {
    width: min(calc(100% - 20px), var(--max));
  }

  .page {
    min-height: auto;
    padding: 18px;
    border-radius: 12px;
  }

  h1 {
    font-size: 29px;
    line-height: 1.02;
  }

  .page-title > p:last-child {
    font-size: 15px;
  }

  .guide-flow,
  .guide-flow.deep-flow {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .top-command {
    max-width: 100vw;
    overflow: hidden;
  }

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

  .playbook-shell,
  .footer {
    width: calc(100vw - 20px);
    max-width: calc(100vw - 20px);
  }
}