/* MathsEdge marketing site — palette + typography lifted straight from
   MathsEdge_branding/tokens so this stays visually consistent with the
   app. Hand-authored to stay dependency-free; no framework, no build. */

:root {
  --ironstone-50:  #F4F5F6;
  --ironstone-100: #E7E9EB;
  --ironstone-300: #B9BDC3;
  --ironstone-500: #6C7178;
  --ironstone-700: #3E434C;
  --ironstone-900: #23262B;
  --white:         #FFFFFF;
  --amber:         #F2A93B;
  --amber-hover:   #DE9827;

  --topic-algebra:    #5B57D1;
  --topic-geometry:   #1E9E96;
  --topic-number:     #F2A93B;
  --topic-statistics: #E8583F;
  --topic-calculus:   #4C8C5B;

  --shadow-sm: 0 2px 6px rgba(35, 38, 43, 0.08);
  --shadow-md: 0 12px 28px rgba(35, 38, 43, 0.14);
  --shadow-lg: 0 24px 60px rgba(35, 38, 43, 0.22);
  --shadow-accent: 0 8px 20px rgba(242, 169, 59, 0.35);

  --font-display: 'Sora', system-ui, -apple-system, sans-serif;
  --font-body:    'Sora', system-ui, -apple-system, sans-serif;
  --font-mono:    'IBM Plex Mono', ui-monospace, monospace;
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  color: var(--ironstone-900);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--ironstone-700); text-decoration: underline; text-underline-offset: 3px; }
a:hover { color: var(--amber-hover); }

/* ---- MathsEdge wordmark ------------------------------------------ */

.wordmark {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1;
  white-space: nowrap;
}
.wordmark .accent { color: var(--amber); }
.wordmark.on-dark  .body { color: var(--white); }
.wordmark.on-light .body { color: var(--ironstone-700); }

/* ---- Layout ------------------------------------------------------ */

.container { max-width: 1080px; margin: 0 auto; padding: 0 24px; }

/* ---- Top bar ----------------------------------------------------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--ironstone-700);
  color: var(--white);
  box-shadow: var(--shadow-sm);
}
.topbar-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 16px 24px;
  max-width: 1080px;
  margin: 0 auto;
}
.topbar-inner .brand-link {
  text-decoration: none;
  display: inline-flex;
}
.topbar-inner nav {
  margin-left: auto;
  display: flex;
  gap: 22px;
  align-items: center;
}
.topbar-inner nav a {
  color: var(--white);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  opacity: 0.9;
}
.topbar-inner nav a:hover { opacity: 1; color: var(--amber); }
.topbar-inner nav a.cta {
  background: var(--amber);
  color: var(--ironstone-900);
  padding: 8px 16px;
  border-radius: 6px;
  transition: background 0.15s;
}
.topbar-inner nav a.cta:hover {
  background: var(--amber-hover);
  color: var(--ironstone-900);
}

/* ---- Hero -------------------------------------------------------- */

.hero {
  background:
    radial-gradient(circle at 15% 15%, rgba(242, 169, 59, 0.14), transparent 40%),
    radial-gradient(circle at 85% 60%, rgba(91, 87, 209, 0.10), transparent 45%),
    var(--ironstone-50);
  padding: 80px 0 96px;
  border-bottom: 1px solid var(--ironstone-100);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(38px, 5.4vw, 60px);
  line-height: 1.05;
  font-weight: 800;
  letter-spacing: -0.02em;
  margin: 0 0 20px;
  color: var(--ironstone-900);
}
.hero h1 .amber { color: var(--amber); }
.hero p.lede {
  font-size: 19px;
  color: var(--ironstone-500);
  margin: 0 0 32px;
  max-width: 520px;
}
.hero-cta {
  display: flex;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 24px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 16px;
  text-decoration: none;
  border: none;
  cursor: pointer;
  font-family: var(--font-display);
  transition: transform 0.1s, box-shadow 0.15s;
}
.btn.primary {
  background: var(--amber);
  color: var(--ironstone-900);
  box-shadow: var(--shadow-accent);
}
.btn.primary:hover {
  background: var(--amber-hover);
  transform: translateY(-1px);
}
.btn.secondary {
  background: var(--white);
  color: var(--ironstone-700);
  border: 1.5px solid var(--ironstone-300);
}
.btn.secondary:hover {
  border-color: var(--ironstone-700);
  color: var(--ironstone-900);
}

/* Hero visual — a mocked ink-pad card */
.hero-visual {
  background: var(--white);
  border: 1px solid var(--ironstone-100);
  border-radius: 14px;
  padding: 24px;
  box-shadow: var(--shadow-lg);
  position: relative;
  overflow: hidden;
}
.hero-visual .pad-question {
  font-size: 14px;
  color: var(--ironstone-500);
  margin-bottom: 8px;
}
.hero-visual .pad-question strong { color: var(--ironstone-700); }
.hero-visual .pad-canvas {
  height: 200px;
  background-image: linear-gradient(var(--ironstone-50) 1px, transparent 1px);
  background-size: 100% 34px;
  border-radius: 6px;
  border: 1px solid var(--ironstone-100);
  padding: 16px;
  position: relative;
  font-family: 'Caveat', 'Comic Sans MS', cursive;
  font-size: 32px;
  line-height: 34px;
  color: var(--ironstone-900);
}
.hero-visual .pad-canvas .line1 {
  color: #2a4d69;
}
.hero-visual .pad-canvas .line2 {
  padding-left: 40px;
  color: #2a4d69;
}
.hero-visual .pad-canvas .line3 {
  padding-left: 40px;
  color: #2a4d69;
}
.hero-visual .pad-feedback {
  margin-top: 16px;
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 14px;
}
.hero-visual .pad-feedback .tick {
  color: var(--topic-calculus);
  font-weight: 700;
}
.hero-visual .pad-feedback .muted { color: var(--ironstone-500); }

/* ---- Sections ---------------------------------------------------- */

section.slab { padding: 88px 0; }
section.slab.alt { background: var(--ironstone-50); border-block: 1px solid var(--ironstone-100); }

.section-eyebrow {
  color: var(--amber);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  margin: 0 0 12px;
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 3.5vw, 40px);
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 0 0 20px;
  color: var(--ironstone-900);
}
.section-lede {
  color: var(--ironstone-500);
  font-size: 18px;
  max-width: 720px;
  margin: 0 0 48px;
}

/* Feature grid */
.features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.feature {
  background: var(--white);
  border: 1px solid var(--ironstone-100);
  border-radius: 12px;
  padding: 28px 24px;
  transition: border-color 0.15s, transform 0.1s;
}
.feature:hover {
  border-color: var(--amber);
  transform: translateY(-2px);
}
.feature .icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  background: var(--ironstone-700);
  color: var(--amber);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 22px;
  margin-bottom: 16px;
}
.feature h3 {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--ironstone-900);
}
.feature p {
  margin: 0;
  color: var(--ironstone-500);
  font-size: 15.5px;
  line-height: 1.6;
}

/* Split rows (image / text alternating) */
.split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
  margin-top: 48px;
}
.split.reverse .split-media { order: 2; }
.split-media {
  background: var(--white);
  border: 1px solid var(--ironstone-100);
  border-radius: 12px;
  padding: 20px;
  box-shadow: var(--shadow-md);
}
.split-copy h3 {
  font-family: var(--font-display);
  font-size: 26px;
  font-weight: 700;
  color: var(--ironstone-900);
  margin: 0 0 12px;
  letter-spacing: -0.01em;
}
.split-copy p {
  color: var(--ironstone-500);
  font-size: 16px;
  margin: 0 0 12px;
}
.split-copy ul {
  padding-left: 22px;
  margin: 0;
}
.split-copy ul li {
  margin-bottom: 6px;
  color: var(--ironstone-700);
}

/* Textbook mockup */
.book-mock {
  padding: 4px 8px;
  font-size: 15px;
  line-height: 1.55;
}
.book-mock h4 {
  font-family: var(--font-display);
  color: #1F6FB2;
  margin: 6px 0 12px;
  border-bottom: 2px solid #1F6FB245;
  padding-bottom: 4px;
  font-size: 22px;
}
.book-mock .aside {
  border-left: 3px solid #1F6FB2;
  background: #1F6FB20d;
  padding: 8px 12px;
  margin: 10px 0;
  border-radius: 3px;
}
.book-mock .aside .label {
  color: #1F6FB2;
  font-weight: 600;
  font-size: 13px;
  margin-bottom: 3px;
  display: block;
}
.book-mock .example {
  background: #1F6FB209;
  border: 1px solid #1F6FB2;
  border-radius: 4px;
  padding: 8px 12px;
  margin: 12px 0;
}
.book-mock .example .badge {
  display: inline-block;
  background: #1F6FB2;
  color: white;
  padding: 2px 8px;
  border-radius: 0 0 3px 0;
  margin: -8px 0 8px -12px;
  font-size: 12px;
  font-weight: 600;
}
.book-mock .details {
  margin-top: 6px;
  padding: 4px 8px;
  background: var(--ironstone-50);
  border-radius: 3px;
  font-style: italic;
  color: var(--ironstone-500);
  font-size: 13px;
}

/* Ink pad demo mockup */
.demo-pad {
  padding: 4px 8px;
}
.demo-pad .stem {
  font-size: 15px;
  color: var(--ironstone-900);
  margin-bottom: 10px;
}
.demo-pad .canvas {
  height: 140px;
  border: 1px solid var(--ironstone-100);
  border-radius: 4px;
  background-image: linear-gradient(var(--ironstone-50) 1px, transparent 1px);
  background-size: 100% 30px;
  padding: 12px;
  font-family: 'Caveat', 'Comic Sans MS', cursive;
  font-size: 26px;
  line-height: 30px;
  color: #2a4d69;
}
.demo-pad .verdict {
  margin-top: 10px;
  padding: 8px 12px;
  background: #4C8C5B14;
  border-left: 3px solid #4C8C5B;
  border-radius: 3px;
  font-size: 14px;
  color: var(--ironstone-700);
}

/* ---- Status callout --------------------------------------------- */

.status-callout {
  border: 1.5px solid var(--amber);
  background: rgba(242, 169, 59, 0.08);
  border-radius: 12px;
  padding: 22px 26px;
  margin-top: 40px;
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  align-items: start;
}
.status-callout .glyph {
  font-size: 32px;
  line-height: 1;
}
.status-callout h4 {
  margin: 0 0 6px;
  color: var(--ironstone-900);
  font-size: 18px;
}
.status-callout p {
  margin: 0;
  color: var(--ironstone-700);
  font-size: 15px;
  line-height: 1.55;
}
.status-callout p + p { margin-top: 8px; }

/* Roadmap chip list */
.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--ironstone-100);
  background: var(--white);
  font-size: 13px;
  color: var(--ironstone-700);
}
.chip.live {
  background: rgba(76, 140, 91, 0.12);
  border-color: rgba(76, 140, 91, 0.35);
  color: var(--topic-calculus);
  font-weight: 600;
}
.chip.soon {
  background: rgba(242, 169, 59, 0.12);
  border-color: rgba(242, 169, 59, 0.4);
  color: var(--amber-hover);
  font-weight: 600;
}
.chip.later {
  color: var(--ironstone-500);
}

/* ---- Contact page ------------------------------------------------ */

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.3fr;
  gap: 56px;
  margin-top: 40px;
}
.contact-card {
  background: var(--ironstone-50);
  border: 1px solid var(--ironstone-100);
  border-radius: 12px;
  padding: 28px;
}
.contact-card h3 {
  font-family: var(--font-display);
  margin: 0 0 12px;
  font-size: 22px;
}
.contact-card p {
  color: var(--ironstone-500);
  margin: 0 0 20px;
}
.contact-card .email-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--ironstone-900);
  background: var(--white);
  padding: 12px 16px;
  border-radius: 8px;
  border: 1px solid var(--ironstone-100);
  text-decoration: none;
  font-weight: 500;
}
.contact-card .email-link:hover {
  border-color: var(--amber);
  color: var(--amber-hover);
}

form.contact {
  display: grid;
  gap: 16px;
}
form.contact label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ironstone-700);
  margin-bottom: 6px;
}
form.contact input,
form.contact textarea {
  width: 100%;
  padding: 12px 14px;
  font: inherit;
  border: 1.5px solid var(--ironstone-100);
  border-radius: 8px;
  background: var(--white);
  color: var(--ironstone-900);
  transition: border-color 0.15s;
}
form.contact input:focus,
form.contact textarea:focus {
  outline: none;
  border-color: var(--amber);
  box-shadow: 0 0 0 3px rgba(242, 169, 59, 0.18);
}
form.contact textarea {
  min-height: 140px;
  resize: vertical;
}
form.contact .actions {
  display: flex;
  gap: 16px;
  align-items: center;
  justify-content: flex-end;
}
form.contact .actions .status {
  margin-right: auto;
  font-size: 14px;
}
form.contact .actions .status.ok { color: var(--topic-calculus); font-weight: 600; }
form.contact .actions .status.err { color: var(--topic-statistics); font-weight: 600; }

/* ---- Footer ------------------------------------------------------ */

footer.site {
  background: var(--ironstone-900);
  color: var(--ironstone-300);
  padding: 40px 0 32px;
  margin-top: 0;
  font-size: 14px;
}
footer.site .footer-inner {
  display: flex;
  gap: 32px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}
footer.site nav {
  display: flex;
  gap: 22px;
}
footer.site nav a {
  color: var(--ironstone-300);
  text-decoration: none;
}
footer.site nav a:hover { color: var(--amber); }
footer.site .fine {
  color: var(--ironstone-500);
  font-size: 12.5px;
  margin-top: 12px;
}

/* ---- Responsive ------------------------------------------------- */

@media (max-width: 860px) {
  .hero { padding: 56px 0 64px; }
  .hero-inner { grid-template-columns: 1fr; gap: 40px; }
  .features { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .split.reverse .split-media { order: 0; }
  .contact-grid { grid-template-columns: 1fr; gap: 32px; }
  section.slab { padding: 56px 0; }
  .topbar-inner nav { gap: 14px; }
  .topbar-inner nav a { font-size: 14px; }
}