:root {
  --ink: #1d2521;
  --muted: #65716b;
  --line: #d9dfdc;
  --paper: #f8f7f3;
  --panel: #ffffff;
  --soft: #eef1ec;
  --accent: #4f6f52;
  --accent-2: #8f5f38;
  --warn: #9b3d30;
  --ok: #356a50;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

a {
  color: var(--accent);
}

p {
  max-width: 78ch;
}

ul, ol {
  max-width: 82ch;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 24px;
  align-items: center;
  padding: 14px 28px;
  border-bottom: 1px solid var(--line);
  background: rgba(248, 247, 243, 0.94);
  backdrop-filter: blur(12px);
}

.brand {
  color: var(--ink);
  font-weight: 800;
  text-decoration: none;
}

nav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

nav a,
.reviewer a {
  color: var(--ink);
  font-size: 0.94rem;
  text-decoration: none;
}

nav a.active {
  color: var(--accent);
  font-weight: 800;
}

.reviewer {
  display: flex;
  gap: 12px;
  align-items: center;
  color: var(--muted);
  font-size: 0.88rem;
}

.page-shell {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto;
  padding: 36px 0 72px;
}

.hero-doc,
.plan-section,
.admin-panel,
.access-card {
  margin: 0 0 22px;
  padding: clamp(22px, 4vw, 42px);
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
}

.hero-doc h1 {
  max-width: 900px;
  margin: 0 0 18px;
  font-size: clamp(2rem, 5vw, 4rem);
  line-height: 1.04;
}

.hero-doc p {
  max-width: 860px;
  font-size: 1.08rem;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-2);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0;
  text-transform: uppercase;
}

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

.section-heading {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: flex-start;
  margin: 0 0 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.35rem, 2.8vw, 2.1rem);
  line-height: 1.12;
}

.comment-link,
button,
.button-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 8px 11px;
  background: #fff;
  color: var(--ink);
  font: inherit;
  text-decoration: none;
  cursor: pointer;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.metric {
  min-height: 124px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: #fbfbf8;
}

.metric span,
.metric small {
  display: block;
  color: var(--muted);
}

.metric strong {
  display: block;
  margin: 5px 0;
  font-size: 1.6rem;
}

.split-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.callout {
  border-left: 4px solid var(--accent);
  padding: 14px 16px;
  background: var(--soft);
}

.phase-flow {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
  margin: 22px 0;
}

.phase-card {
  position: relative;
  min-height: 145px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
  background: #fbfbf8;
}

.phase-card strong {
  display: block;
  margin-bottom: 8px;
}

.phase-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.93rem;
}

.scenario-table,
.admin-panel table {
  width: 100%;
  border-collapse: collapse;
}

.plan-section {
  overflow-x: auto;
}

.scenario-table {
  min-width: 680px;
}

.scenario-table th,
.scenario-table td,
.admin-panel th,
.admin-panel td {
  border-bottom: 1px solid var(--line);
  padding: 10px 8px;
  text-align: left;
  vertical-align: top;
}

.scenario-table th {
  color: var(--muted);
  font-weight: 800;
}

.diagram-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin: 24px 0;
}

.diagram-frame {
  margin: 24px 0;
}

.diagram-scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfbf8;
}

.diagram-frame img {
  display: block;
  width: 100%;
  min-width: 720px;
  height: auto;
}

.diagram-frame figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.comment-drawer[hidden] {
  display: none;
}

.comment-drawer {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: end center;
  padding: 18px;
  background: rgba(29, 37, 33, 0.32);
}

.comment-form {
  width: min(620px, 100%);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 24px;
  background: #fff;
  box-shadow: 0 22px 80px rgba(0, 0, 0, 0.18);
}

.comment-form label,
.admin-panel label {
  display: grid;
  gap: 6px;
  margin: 12px 0;
  font-weight: 700;
}

input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 10px;
  font: inherit;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

.drawer-close {
  float: right;
  font-size: 1.2rem;
  line-height: 1;
}

.notice.success {
  color: var(--ok);
}

.notice.error {
  color: var(--warn);
}

.comment-review {
  margin: 12px 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: #fff;
}

.comment-review header,
.comment-review footer {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  color: var(--muted);
}

.access-page {
  display: grid;
  min-height: 100vh;
  place-items: center;
  padding: 24px;
}

.access-card {
  width: min(620px, 100%);
}

.admin-wrap {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0;
}

.site-footer {
  width: min(1120px, calc(100% - 32px));
  margin: 0 auto 36px;
  color: var(--muted);
}

@media (max-width: 860px) {
  .site-header {
    position: static;
    grid-template-columns: 1fr;
    gap: 10px;
    padding: 16px;
  }

  .metric-grid,
  .split-grid,
  .phase-flow,
  .diagram-grid {
    grid-template-columns: 1fr;
  }

  .section-heading {
    display: grid;
  }

  .diagram-frame img {
    min-width: 660px;
  }
}