/* Alpha to Zulu website. Plain CSS, no build step.
   Colors match the app's default "Navy" palette (app repo: src/constants/theme.ts). */

:root {
  --text: #0b1b2b;
  --text-2: #5b6573;
  --bg: #ffffff;
  --bg-2: #f1f4f8;
  --bg-3: #e2e8f0;
  --border: #d9dee5;
  --primary: #0b3d91;
  --on-primary: #ffffff;
  --accent: #8e2c7a; /* sectional-chart magenta, used sparingly */
  --red: #c62828;
  --yellow: #f2b705;
  --green: #2e7d32;
  --on-yellow: #1a1300;
  --radius: 14px;
  --max: 1080px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text: #f5f7fa;
    --text-2: #a3adba;
    --bg: #0a0f16;
    --bg-2: #161d27;
    --bg-3: #222b37;
    --border: #2a3340;
    --primary: #6ea8fe;
    --on-primary: #0a0f16;
    --accent: #e07bc8;
    --red: #f97066;
    --yellow: #facc15;
    --green: #4ade80;
  }
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

img,
svg {
  max-width: 100%;
}

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

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0 0 0.5em;
}

h1 {
  font-size: clamp(2rem, 6vw, 3.2rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.1rem);
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.15rem;
}

p {
  margin: 0 0 1em;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 20px;
}

.skip {
  position: absolute;
  left: -999px;
}
.skip:focus {
  left: 12px;
  top: 12px;
  background: var(--bg);
  padding: 8px 12px;
  z-index: 10;
}

/* Header */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 5;
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  margin-right: auto;
}

.logo {
  display: inline-grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 9px;
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 800;
  font-size: 0.8rem;
  letter-spacing: 0.02em;
}

.nav {
  display: flex;
  gap: 18px;
  align-items: center;
}

.nav a {
  color: var(--text-2);
  text-decoration: none;
  font-size: 0.95rem;
}

.nav a:hover {
  color: var(--text);
}

.brand,
.btn {
  white-space: nowrap;
}

@media (max-width: 640px) {
  .nav .hide-sm {
    display: none;
  }
  .nav {
    gap: 12px;
  }
}

@media (max-width: 380px) {
  .nav .hide-xs {
    display: none;
  }
}

/* Buttons */

.btn {
  display: inline-block;
  padding: 12px 20px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
  line-height: 1.2;
}

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
}

.btn-primary:hover {
  filter: brightness(1.1);
}

.btn-ghost {
  border-color: var(--border);
  color: var(--text);
}

.btn-sm {
  padding: 8px 14px;
  font-size: 0.9rem;
}

.nav .btn-primary {
  color: var(--on-primary);
}

/* Sections */

section {
  padding: 64px 0;
}

.alt {
  background: var(--bg-2);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 8px;
}

.lead {
  font-size: 1.15rem;
  color: var(--text-2);
  max-width: 40em;
}

.muted {
  color: var(--text-2);
}

.small {
  font-size: 0.9rem;
}

/* Hero */

.hero {
  padding: 56px 0 64px;
}

.hero-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

@media (min-width: 900px) {
  .hero-grid {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 24px 0 12px;
}

/* Example cards (illustrations of the app, built in HTML) */

.mock {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 20px;
  box-shadow: 0 12px 40px rgba(11, 27, 43, 0.12);
  max-width: 420px;
  width: 100%;
  margin: 0 auto;
}

.alt .mock {
  box-shadow: 0 8px 24px rgba(11, 27, 43, 0.08);
}

.mock-label {
  font-size: 0.75rem;
  color: var(--text-2);
  text-align: center;
  margin-top: 10px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 12px;
}

.tag {
  font-size: 0.75rem;
  padding: 3px 9px;
  border-radius: 999px;
  background: var(--bg-2);
  color: var(--text-2);
  border: 1px solid var(--border);
}

.tag.code {
  font-family: var(--mono);
  color: var(--primary);
}

.mock-q {
  font-weight: 600;
  font-size: 1.05rem;
  margin-bottom: 12px;
}

.mock-a {
  background: var(--bg-2);
  border-radius: 10px;
  padding: 12px 14px;
  font-size: 0.95rem;
  margin-bottom: 10px;
}

.mock-ref {
  font-size: 0.85rem;
  color: var(--text-2);
  margin-bottom: 14px;
}

.grade-row {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.grade {
  text-align: center;
  padding: 9px 4px;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 700;
  color: #fff;
}

.grade.red {
  background: var(--red);
}
.grade.yellow {
  background: var(--yellow);
  color: var(--on-yellow);
}
.grade.green {
  background: var(--green);
}

@media (prefers-color-scheme: dark) {
  .grade.red,
  .grade.green {
    color: #0a0f16;
  }
}

.points {
  list-style: none;
  padding: 0;
  margin: 0 0 12px;
  font-size: 0.92rem;
}

.points li {
  display: flex;
  gap: 8px;
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}

.points li:last-child {
  border-bottom: 0;
}

.pill {
  flex: none;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 6px;
  height: fit-content;
  margin-top: 2px;
}

.pill.hit {
  background: var(--green);
  color: #fff;
}
.pill.partial {
  background: var(--yellow);
  color: var(--on-yellow);
}
.pill.missed {
  background: var(--red);
  color: #fff;
}

@media (prefers-color-scheme: dark) {
  .pill.hit,
  .pill.missed {
    color: #0a0f16;
  }
}

.ai-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 2px 9px;
  margin-bottom: 10px;
}

.level {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 14px;
}

.level-badge {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 800;
  font-size: 1.4rem;
}

.task-row {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

.task-row:last-child {
  border-bottom: 0;
}

.status {
  flex: none;
  font-size: 0.75rem;
  font-weight: 600;
}
.status.learned {
  color: var(--green);
}
.status.progress {
  color: var(--primary);
}
.status.new {
  color: var(--text-2);
}

/* Steps */

.step {
  display: grid;
  gap: 32px;
  align-items: center;
  padding: 32px 0;
}

@media (min-width: 900px) {
  .step {
    grid-template-columns: 1fr 1fr;
    gap: 56px;
  }
  .step.flip .step-text {
    order: 2;
  }
}

.step-num {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 700;
  margin-bottom: 12px;
}

.checks {
  padding-left: 0;
  list-style: none;
}

.checks li {
  position: relative;
  padding-left: 26px;
  margin-bottom: 8px;
}

.checks li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.55em;
  width: 12px;
  height: 7px;
  border-left: 2.5px solid var(--primary);
  border-bottom: 2.5px solid var(--primary);
  transform: rotate(-45deg);
}

/* Grids */

.grid-3 {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

@media (min-width: 760px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-2 {
  display: grid;
  gap: 20px;
  margin-top: 28px;
}

@media (min-width: 760px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

.box {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}

.box p:last-child {
  margin-bottom: 0;
}

/* FAQ */

details {
  border-bottom: 1px solid var(--border);
  padding: 16px 0;
}

summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1.05rem;
}

details p {
  margin: 10px 0 0;
  color: var(--text-2);
}

/* Call to action band */

.band {
  background: var(--primary);
  color: var(--on-primary);
  text-align: center;
}

.band .lead {
  color: inherit;
  opacity: 0.9;
  margin: 0 auto 24px;
}

.band .btn {
  background: var(--on-primary);
  color: var(--primary);
}

/* Legal and support pages */

.doc {
  max-width: 760px;
  padding-top: 48px;
  padding-bottom: 64px;
}

.doc h2 {
  font-size: 1.35rem;
  margin-top: 2em;
}

.doc h3 {
  margin-top: 1.5em;
}

.doc ul {
  padding-left: 1.3em;
}

.doc li {
  margin-bottom: 0.4em;
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin: 1em 0 1.5em;
}

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

.doc th {
  background: var(--bg-2);
}

.table-scroll {
  overflow-x: auto;
}

.notice {
  background: var(--bg-2);
  border-left: 4px solid var(--accent);
  border-radius: 8px;
  padding: 14px 16px;
  margin: 1.5em 0;
}

.notice p:last-child {
  margin-bottom: 0;
}

.toc {
  background: var(--bg-2);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 1.5em 0;
}

.toc ol {
  margin: 0;
  padding-left: 1.3em;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--border);
  padding: 36px 0 48px;
  font-size: 0.9rem;
  color: var(--text-2);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-bottom: 16px;
}

.footer-links a {
  color: var(--text-2);
}

.disclaimer {
  font-weight: 600;
  color: var(--text);
}