/* ---------- Design tokens ---------- */
:root {
  --color-bg: #f5f7fb;
  --color-surface: #ffffff;
  --color-surface-alt: #eef1f7;
  --color-border: #e3e7ef;
  --color-text: #16181f;
  --color-text-muted: #676d7e;
  --color-primary: #155eef;
  --color-primary-dark: #0d3fb0;
  --color-primary-soft: #e8f0ff;
  --color-accent: #00a389;
  --color-accent-soft: #e2f7f2;
  --color-success: #16a34a;
  --color-success-soft: #e8f8ee;
  --color-warning: #b45309;
  --color-warning-soft: #fef3e2;
  --color-danger: #dc2626;
  --color-danger-soft: #fdecec;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
  --shadow-md: 0 8px 24px rgba(16, 24, 40, 0.08);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --sidebar-width: 280px;
  --topbar-height: 68px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0e1016;
    --color-surface: #161922;
    --color-surface-alt: #1d212c;
    --color-border: #2a2f3d;
    --color-text: #eceef3;
    --color-text-muted: #9aa1b5;
    --color-primary-soft: #16264d;
    --color-accent-soft: #103832;
    --color-success-soft: #0f2b1b;
    --color-warning-soft: #3a2a10;
    --color-danger-soft: #3a1616;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}
a { color: var(--color-primary); }
code { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 0.92em; }
h1, h2, h3, h4 { line-height: 1.25; margin: 0 0 8px; }
p { line-height: 1.55; margin: 0 0 12px; }
ol, ul { margin: 0; padding: 0; }

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

/* ---------- Shell layout ---------- */
.shell { min-height: 100vh; display: flex; flex-direction: column; }

.topbar {
  height: var(--topbar-height);
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 0 24px;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 20;
}
.topbar__brand { display: flex; align-items: center; gap: 16px; margin-right: auto; min-width: 0; }
.topbar__logo { height: 44px; width: auto; display: block; }
.topbar__title { font-size: 15px; padding-left: 16px; border-left: 1px solid var(--color-border); }
@media (max-width: 640px) {
  .topbar { padding: 0 16px; }
  .topbar__logo { height: 36px; }
  .topbar__title { display: none; }
}

.body { flex: 1 1 auto; display: flex; min-height: 0; }

.sidebar {
  width: var(--sidebar-width);
  flex: 0 0 auto;
  border-right: 1px solid var(--color-border);
  background: var(--color-surface);
  padding: 20px 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  overflow-y: auto;
}

.content {
  flex: 1 1 auto;
  padding: 32px 40px 60px;
  max-width: 880px;
  margin: 0 auto;
  width: 100%;
}

/* ---------- Progress ---------- */
.progress-wrap { display: flex; flex-direction: column; gap: 6px; }
.progress-bar { height: 8px; border-radius: 999px; background: var(--color-surface-alt); overflow: hidden; }
.progress-bar__fill { height: 100%; background: linear-gradient(90deg, var(--color-primary), var(--color-accent)); border-radius: 999px; transition: width .25s ease; }
.progress-label { font-size: 12px; color: var(--color-text-muted); font-weight: 600; }

.step-nav { list-style: none; display: flex; flex-direction: column; gap: 2px; flex: 1; }
.step-nav__item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 10px; border-radius: var(--radius-sm); cursor: pointer;
  font-size: 14px; color: var(--color-text-muted); font-weight: 500;
  transition: background .12s ease;
}
.step-nav__item:hover { background: var(--color-surface-alt); }
.step-nav__item--locked { opacity: 0.55; cursor: not-allowed; }
.step-nav__item--current { background: var(--color-primary-soft); color: var(--color-primary-dark); font-weight: 700; }
.step-nav__item--done .step-nav__badge { background: var(--color-success); color: #fff; }
.step-nav__badge {
  width: 22px; height: 22px; border-radius: 50%; background: var(--color-surface-alt);
  display: flex; align-items: center; justify-content: center; font-size: 12px; font-weight: 700;
  flex: 0 0 auto; color: var(--color-text-muted);
}
.step-nav__item--current .step-nav__badge { background: var(--color-primary); color: #fff; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  color: var(--color-text);
  padding: 9px 16px; border-radius: var(--radius-sm);
  font-size: 14px; font-weight: 600; cursor: pointer;
  text-decoration: none;
  transition: transform .06s ease, box-shadow .12s ease, background .12s ease;
}
.btn:hover { box-shadow: var(--shadow-sm); }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }
.btn--primary { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }
.btn--primary:hover { background: var(--color-primary-dark); }
.btn--accent { background: var(--color-accent); border-color: var(--color-accent); color: #fff; }
.btn--secondary { background: var(--color-surface-alt); }
.btn--ghost { background: transparent; border-color: transparent; }
.btn-copy {
  border: 1px solid var(--color-border); background: var(--color-surface); color: var(--color-text);
  border-radius: 6px; padding: 3px 8px; font-size: 12px; font-family: inherit; cursor: pointer; margin-left: 8px;
}
.btn-copy:hover { background: var(--color-surface-alt); }
.btn-link { background: none; border: none; color: var(--color-primary); cursor: pointer; font-size: 13px; padding: 0; }
.btn-link--muted { color: var(--color-text-muted); }

/* ---------- Cards & fields ---------- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 22px 24px;
  margin-bottom: 20px;
  box-shadow: var(--shadow-sm);
}
.card--info { background: var(--color-primary-soft); border-color: transparent; }
.card--success { background: var(--color-success-soft); border-color: transparent; }
.card--warning { background: var(--color-warning-soft); border-color: transparent; }

.grid { display: grid; gap: 14px; }
.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 720px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

.field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 4px; }
.field span { font-size: 13px; font-weight: 600; color: var(--color-text-muted); }
.field input, .field select {
  border: 1px solid var(--color-border); border-radius: var(--radius-sm);
  padding: 10px 12px; font-size: 14px; background: var(--color-bg); color: var(--color-text);
  font-family: inherit;
}
.field input:focus, .field select:focus { outline: 2px solid var(--color-primary); outline-offset: 1px; }
.field small { color: var(--color-text-muted); font-size: 12px; }
.field--action { display: flex; align-items: flex-end; }
.field--action .btn { width: 100%; justify-content: center; }

/* ---------- Step header ---------- */
.step__header { margin-bottom: 24px; }
.step__header h1 { font-size: 26px; }
.step__lead { font-size: 15.5px; color: var(--color-text-muted); max-width: 640px; }

/* ---------- Checklist / lists ---------- */
.checklist { list-style: none; display: flex; flex-direction: column; gap: 8px; }
.checklist li { font-size: 14.5px; }
.checklist__item--done { color: var(--color-success); font-weight: 600; }
.checklist--preview li { color: var(--color-text-muted); }
.steps-list { list-style: decimal; padding-left: 20px; display: flex; flex-direction: column; gap: 10px; }
.steps-list li { font-size: 14.5px; line-height: 1.5; }

/* ---------- Callouts ---------- */
.callout { border-radius: var(--radius-sm); padding: 12px 14px; font-size: 13.5px; margin: 12px 0; line-height: 1.5; }
.callout--info { background: var(--color-primary-soft); }
.callout--warning { background: var(--color-warning-soft); color: var(--color-warning); }
.callout--success { background: var(--color-success-soft); color: var(--color-success); }
.callout--muted { background: var(--color-surface-alt); color: var(--color-text-muted); }
.callout a { font-weight: 600; }

/* ---------- Tags & pills ---------- */
.tag { display: inline-block; font-size: 11px; font-weight: 700; padding: 2px 8px; border-radius: 999px; background: var(--color-surface-alt); color: var(--color-text-muted); vertical-align: middle; margin-left: 8px; }
.tag--critical { background: var(--color-danger-soft); color: var(--color-danger); }

.pill { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 999px; }
.pill--muted { background: var(--color-surface-alt); color: var(--color-text-muted); }
.pill--checking { background: var(--color-primary-soft); color: var(--color-primary); }
.pill--ok { background: var(--color-success-soft); color: var(--color-success); }
.pill--fail { background: var(--color-warning-soft); color: var(--color-warning); }
.pill__icon { font-size: 11px; }

/* ---------- Record cards ---------- */
.record-list { display: flex; flex-direction: column; gap: 18px; }
.record-card { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-md); padding: 20px 22px; box-shadow: var(--shadow-sm); }
.record-card__head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; margin-bottom: 10px; }
.record-card__head h3 { font-size: 16.5px; }
.record-table { display: flex; flex-direction: column; gap: 0; border: 1px solid var(--color-border); border-radius: var(--radius-sm); overflow: hidden; margin: 12px 0; }
.record-table__row { display: grid; grid-template-columns: 140px 1fr; border-top: 1px solid var(--color-border); }
.record-table__row:first-child { border-top: none; }
.record-table__label { padding: 10px 14px; background: var(--color-surface-alt); font-size: 12.5px; font-weight: 700; color: var(--color-text-muted); display: flex; align-items: center; }
.record-table__value { padding: 10px 14px; display: flex; align-items: center; flex-wrap: wrap; gap: 6px; font-size: 13.5px; }
.code-block { word-break: break-all; }
.record-card__actions { display: flex; align-items: center; gap: 14px; margin-top: 14px; flex-wrap: wrap; }
.record-card__hint { font-size: 12.5px; }
.record-card__extra { margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--color-border); }
.record-card__extra h4 { font-size: 14.5px; margin-bottom: 10px; }

/* ---------- Tables ---------- */
.table { width: 100%; border-collapse: collapse; margin: 14px 0; font-size: 13.5px; }
.table th, .table td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--color-border); }
.table th { color: var(--color-text-muted); font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }

/* ---------- Option cards (migration) ---------- */
.option-list { display: flex; flex-direction: column; gap: 10px; }
.option-card {
  display: flex; align-items: flex-start; gap: 12px; padding: 14px 16px;
  border: 1px solid var(--color-border); border-radius: var(--radius-sm); cursor: pointer;
  background: var(--color-surface-alt);
}
.option-card input { margin-top: 4px; }
.option-card--selected { border-color: var(--color-primary); background: var(--color-primary-soft); }

/* ---------- Step footer nav ---------- */
.step-footer { display: flex; align-items: center; justify-content: space-between; margin-top: 28px; padding-top: 20px; border-top: 1px solid var(--color-border); }

/* ---------- Modal ---------- */
.modal-backdrop { position: fixed; inset: 0; background: rgba(10, 12, 20, 0.45); display: flex; align-items: center; justify-content: center; z-index: 50; }
.modal-backdrop.hidden { display: none; }
.modal { background: var(--color-surface); border-radius: var(--radius-lg); padding: 28px; width: min(420px, 92vw); box-shadow: var(--shadow-md); }
.actions-row { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0; }

/* ---------- Toast ---------- */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translate(-50%, 20px);
  background: var(--color-text); color: var(--color-bg);
  padding: 12px 18px; border-radius: var(--radius-sm); font-size: 13.5px;
  opacity: 0; pointer-events: none; transition: transform .18s ease, opacity .18s ease;
  z-index: 100; max-width: 90vw; box-shadow: var(--shadow-md);
}
.toast--visible { opacity: 1; transform: translate(-50%, 0); }
.toast--success { background: var(--color-success); color: #fff; }
.toast--warning { background: var(--color-warning); color: #fff; }

/* ---------- Responsive ---------- */
@media (max-width: 940px) {
  .body { flex-direction: column; }
  .sidebar {
    width: 100%; flex-direction: row; align-items: center; overflow-x: auto;
    border-right: none; border-bottom: 1px solid var(--color-border);
    padding: 12px 16px;
  }
  .progress-wrap { display: none; }
  .step-nav { flex-direction: row; }
  .step-nav__item span:last-child { display: none; }
  .btn-link--muted { display: none; }
  .content { padding: 24px 18px 60px; }
}

@media print {
  .topbar, .sidebar, .step-footer, #toast, .modal-backdrop { display: none !important; }
  .content { max-width: 100%; }
}