@font-face {
  font-family: "RobotoMono";
  src: url("../assets/fonts/RobotoMono.ttf") format("truetype");
  font-weight: 100 700;
  font-display: swap;
}

:root {
  --bg: #121212;
  --surface: #1e1e1e;
  --surface-high: #2a2a2a;
  --accent: #00ffff;
  --accent-dim: #1ab7c4;
  --danger: #e53935;
  --success: #43a047;
  --text: #ececec;
  --text-secondary: #9e9e9e;
  --divider: #323232;
  --grid: #1a1a1a;
  --grid-strong: #232323;
  --mono: "RobotoMono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --sans: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --radius: 8px;
  --max: 1080px;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background-color: var(--bg);
  background-image:
    linear-gradient(var(--grid-strong) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-strong) 1px, transparent 1px),
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px, 24px 24px, 24px 24px;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

h1,
h2,
h3 {
  font-family: var(--mono);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
}

h1 {
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
}

h3 {
  font-size: 1.1rem;
  font-weight: 600;
}

p {
  margin: 0 0 1em;
}

.container {
  width: min(100% - 40px, var(--max));
  margin-inline: auto;
}

.stencil {
  font-family: var(--mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
  display: block;
}

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

.skip-link {
  position: absolute;
  left: -9999px;
}

.skip-link:focus {
  left: 16px;
  top: 16px;
  z-index: 100;
  background: var(--accent);
  color: #000;
  padding: 8px 12px;
}

/* Header */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(18, 18, 18, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--divider);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
  text-decoration: none;
}

.brand img {
  height: 30px;
  width: auto;
}

.nav-links {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-links a {
  font-family: var(--mono);
  font-size: 0.85rem;
  color: var(--text-secondary);
  text-decoration: none;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--accent);
}

.language-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: 4px;
  padding-left: 16px;
  border-left: 1px solid var(--divider);
}

.language-switch a {
  padding: 5px 7px;
  border: 1px solid transparent;
  border-radius: 4px;
  font-size: 0.75rem;
}

.language-switch a[aria-current="page"] {
  border-color: var(--accent-dim);
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--divider);
  border-radius: 6px;
  color: var(--text);
  padding: 6px 10px;
  font-family: var(--mono);
  cursor: pointer;
}

@media (max-width: 720px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--divider);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    display: block;
    padding: 14px 20px;
    border-top: 1px solid var(--divider);
  }

  .language-switch {
    justify-content: flex-start;
    gap: 8px;
    margin: 0;
    padding: 10px 14px;
    border-left: 0;
    border-top: 1px solid var(--divider);
  }

  .language-switch a {
    display: inline-block;
    padding: 8px 12px;
    border: 1px solid var(--divider);
  }
}

/* Hero */

.hero {
  padding: 96px 0 80px;
}

.hero .container {
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 56px;
  align-items: center;
}

.hero .lead {
  font-size: 1.2rem;
  color: var(--text-secondary);
  max-width: 34ch;
}

.hero h1 .accent {
  color: var(--accent);
}

.badge-offline {
  display: inline-block;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  border: 1px solid var(--accent-dim);
  border-radius: 4px;
  padding: 4px 10px;
  margin-bottom: 20px;
  color: var(--accent);
}

.store-buttons {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.store-button {
  display: inline-flex;
  flex-direction: column;
  min-width: 180px;
  padding: 10px 18px;
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  font-family: var(--mono);
  text-decoration: none;
}

.store-button small {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.store-button strong {
  font-size: 1.05rem;
}

.store-button[aria-disabled="true"] {
  cursor: default;
}

.hero-art {
  display: flex;
  justify-content: center;
}

.hero-art img {
  width: min(320px, 70vw);
  height: auto;
  border-radius: 22%;
  box-shadow:
    0 0 0 1px var(--divider),
    0 0 80px rgba(0, 255, 255, 0.18);
}

@media (max-width: 860px) {
  .hero {
    padding: 56px 0;
  }

  .hero .container {
    grid-template-columns: 1fr;
  }

  .hero-art {
    order: -1;
  }

  .hero-art img {
    width: 160px;
  }
}

/* Sections */

section {
  padding: 72px 0;
}

.section-intro {
  max-width: 60ch;
  color: var(--text-secondary);
  margin-bottom: 40px;
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  background: var(--surface);
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  padding: 24px;
}

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

.card .icon {
  display: block;
  width: 36px;
  height: 36px;
  color: var(--accent);
  margin-bottom: 14px;
}

.card .count {
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--accent-dim);
  text-transform: uppercase;
}

.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

@media (max-width: 860px) {
  .split {
    grid-template-columns: 1fr;
  }
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 0;
}

.checklist li {
  position: relative;
  padding-left: 30px;
  margin-bottom: 12px;
}

.checklist li::before {
  content: "\2713";
  position: absolute;
  left: 0;
  font-family: var(--mono);
  color: var(--accent);
}

/* Daily drills mock card, mirrors the app's home card */

.drills-card {
  background: var(--surface);
  border: 1px solid var(--divider);
  border-radius: 12px;
  padding: 20px;
  font-family: var(--mono);
}

.drills-card header {
  display: flex;
  justify-content: space-between;
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.drills-card header span:last-child {
  color: var(--accent);
}

.drill {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px 0;
  border-top: 1px solid var(--divider);
}

.drill .dot {
  width: 22px;
  height: 22px;
  flex: none;
  border-radius: 50%;
  border: 2px solid var(--accent-dim);
}

.drill.done .dot {
  background: var(--accent);
  border-color: var(--accent);
}

.drill strong {
  display: block;
  font-size: 0.95rem;
}

.drill.done strong {
  color: var(--text-secondary);
  text-decoration: line-through;
}

.drill small {
  color: var(--text-secondary);
  font-size: 0.75rem;
}

.drill .due {
  color: var(--danger);
}

.streak {
  margin-top: 14px;
  font-size: 0.8rem;
  color: #ffab40;
}

/* Privacy band */

.privacy-band {
  background: linear-gradient(180deg, rgba(0, 255, 255, 0.05), transparent);
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
}

/* FAQ */

.faq details {
  background: var(--surface);
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  padding: 18px 22px;
  margin-bottom: 12px;
}

.faq summary {
  cursor: pointer;
  font-family: var(--mono);
  font-weight: 600;
  list-style: none;
}

.faq summary::-webkit-details-marker {
  display: none;
}

.faq summary::before {
  content: "+";
  color: var(--accent);
  display: inline-block;
  width: 1.4em;
}

.faq details[open] summary::before {
  content: "−";
}

.faq details p {
  margin: 12px 0 0;
  color: var(--text-secondary);
}

.notice {
  border-left: 3px solid var(--danger);
  background: rgba(229, 57, 53, 0.08);
  padding: 16px 20px;
  border-radius: 0 var(--radius) var(--radius) 0;
}

/* Document pages (privacy, support) */

.doc {
  padding: 64px 0 80px;
}

.doc .container {
  max-width: 760px;
}

.doc h2 {
  font-size: 1.3rem;
  margin-top: 2.2em;
}

.doc ul {
  padding-left: 1.2em;
}

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

.doc table {
  width: 100%;
  border-collapse: collapse;
  margin: 1em 0 1.5em;
  font-size: 0.95rem;
}

.doc th,
.doc td {
  text-align: left;
  vertical-align: top;
  padding: 10px 12px;
  border: 1px solid var(--divider);
}

.doc th {
  background: var(--surface);
  font-family: var(--mono);
  font-size: 0.85rem;
}

/* Footer */

.site-footer {
  border-top: 1px solid var(--divider);
  padding: 40px 0;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 16px;
}

.site-footer nav {
  display: flex;
  gap: 20px;
}

.site-footer a {
  color: var(--text-secondary);
}

.site-footer a:hover {
  color: var(--accent);
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}