/* ==========================================================================
   AutiLearn — shared design system
   Calm, restrained palette matching the app itself (sage green, soft
   off-white, charcoal text). No auto-motion/flashing, strong contrast,
   generous spacing, accessibility-first typography.
   ========================================================================== */

:root {
  /* Palette */
  --color-bg: #eef4f1;
  --color-surface: #ffffff;
  --color-surface-alt: #f5f9f6;
  --color-text: #263038;
  --color-text-muted: #5c6670;

  --color-primary: #6f9b74;
  --color-primary-dark: #557a59;
  --color-primary-light: #e1ece2;
  --color-secondary: #37424c;
  --color-secondary-light: #eef1f3;

  --color-border: #dbe3df;
  --color-focus: #3d6b90;

  /* Type */
  --font-sans: "Atkinson Hyperlegible", "Segoe UI", Verdana, sans-serif;

  /* Layout */
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2.5rem;
  --space-5: 4rem;
  --max-width: 1100px;
  --shadow-soft: 0 10px 30px rgba(38, 48, 56, 0.07);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.65;
  font-size: 1.05rem;
}

h1,
h2,
h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 var(--space-2);
  color: var(--color-secondary);
}

h1 {
  font-size: clamp(2rem, 3.6vw, 2.75rem);
}

h2 {
  font-size: clamp(1.5rem, 2.8vw, 2rem);
}

h3 {
  font-size: 1.25rem;
}

p {
  margin: 0 0 var(--space-2);
  color: var(--color-text-muted);
}

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

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

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
  html {
    scroll-behavior: auto;
  }
}

a:focus-visible,
button:focus-visible,
.nav-link:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-surface);
  color: var(--color-text);
  padding: var(--space-1) var(--space-2);
  border-radius: 0 0 var(--radius-sm) 0;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-3);
}

/* ---------- Header / nav ---------- */

.site-header {
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
  position: sticky;
  top: 0;
  z-index: 50;
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: var(--space-2);
  padding-bottom: var(--space-2);
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.4rem;
  color: var(--color-secondary);
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.3rem;
  height: 2.3rem;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #fff;
  font-weight: 800;
}

.nav-toggle {
  display: none;
  background: none;
  border: 2px solid var(--color-secondary);
  border-radius: var(--radius-sm);
  padding: 0.4rem 0.6rem;
  font-size: 1.3rem;
  cursor: pointer;
  color: var(--color-secondary);
}

.main-nav ul {
  display: flex;
  gap: var(--space-3);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-link {
  text-decoration: none;
  color: var(--color-secondary);
  font-weight: 700;
  padding: 0.4rem 0.2rem;
  border-bottom: 3px solid transparent;
}

.nav-link:hover {
  border-bottom-color: var(--color-primary);
}

@media (max-width: 760px) {
  .nav-toggle {
    display: inline-block;
  }

  .main-nav {
    display: none;
    width: 100%;
  }

  .main-nav.is-open {
    display: block;
  }

  .site-header .container {
    flex-wrap: wrap;
  }

  .main-nav ul {
    flex-direction: column;
    gap: var(--space-1);
    padding: var(--space-2) 0;
  }
}

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

.hero {
  padding: var(--space-5) 0 var(--space-4);
  background: linear-gradient(180deg, var(--color-primary-light) 0%, var(--color-bg) 100%);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: var(--space-4);
  align-items: center;
}

@media (max-width: 820px) {
  .hero-grid {
    grid-template-columns: 1fr;
  }
}

.eyebrow {
  display: inline-block;
  background: var(--color-secondary);
  color: #fff;
  font-weight: 700;
  padding: 0.3rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  margin-bottom: var(--space-2);
}

.hero p.lead {
  font-size: 1.15rem;
  color: var(--color-text);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.hero-media,
.feature-media {
  display: flex;
  align-items: center;
  justify-content: center;
}

/* ---------- Phone-shaped screenshot placeholder ---------- */

.phone-frame {
  width: min(240px, 100%);
  aspect-ratio: 9 / 18;
  border: 2px dashed var(--color-primary-dark);
  border-radius: 32px;
  background: var(--color-primary-light);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: var(--space-3);
  text-align: center;
}

.phone-frame-icon {
  font-size: 1.8rem;
}

.phone-frame-label {
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--color-primary-dark);
}

/* ---------- Real screenshots ---------- */

.screenshot-frame {
  width: min(240px, 100%);
  border-radius: 24px;
  overflow: hidden;
  border: 2px solid var(--color-primary-dark);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.12);
  line-height: 0;
}

.screenshot-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.screenshot-frame--wide {
  width: min(460px, 100%);
  border-radius: 16px;
}

.screenshot-collage {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
  justify-content: center;
}

.screenshot-collage .screenshot-frame {
  width: min(180px, 45%);
}

.screenshot-gallery {
  display: flex;
  gap: var(--space-3);
  flex-wrap: wrap;
  justify-content: center;
  margin-top: var(--space-4);
}

.screenshot-gallery .screenshot-frame {
  width: min(170px, 45%);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 1.6rem;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  border: 2px solid transparent;
  font-family: var(--font-sans);
  font-size: 1rem;
  cursor: pointer;
}

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

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

.btn-secondary {
  background: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.btn-secondary:hover {
  background: var(--color-secondary-light);
}

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

.section {
  padding: var(--space-5) 0;
}

.section-alt {
  background: var(--color-surface-alt);
}

.section-head {
  max-width: 700px;
  margin: 0 auto var(--space-4);
  text-align: center;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-3);
}

@media (max-width: 900px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 620px) {
  .card-grid {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
  padding: var(--space-3);
}

.card-icon {
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  background: var(--color-primary-light);
  margin-bottom: var(--space-2);
}

/* ---------- Alternating feature rows ---------- */

.feature-row {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-4);
  align-items: center;
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-border);
}

.feature-row:last-child {
  border-bottom: none;
}

.feature-row--reverse {
  grid-template-columns: 0.8fr 1.2fr;
}

.feature-row--reverse .feature-copy {
  order: 2;
}

.feature-row--reverse .feature-media {
  order: 1;
}

@media (max-width: 820px) {
  .feature-row,
  .feature-row--reverse {
    grid-template-columns: 1fr;
  }

  .feature-row--reverse .feature-copy,
  .feature-row--reverse .feature-media {
    order: initial;
  }
}

.feature-kicker {
  display: inline-block;
  color: var(--color-primary-dark);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.8rem;
  margin-bottom: 0.3rem;
}

.feature-list {
  margin: var(--space-2) 0 0;
  padding-left: 1.2rem;
  color: var(--color-text-muted);
  display: grid;
  gap: 0.5rem;
}

.feature-list li::marker {
  color: var(--color-primary);
}

/* ---------- Callout ---------- */

.callout {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
  padding: var(--space-4);
  border-left: 6px solid var(--color-primary);
}

.pillar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
  margin-top: var(--space-3);
}

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

.site-footer {
  background: var(--color-secondary);
  color: #eef1f3;
  padding: var(--space-4) 0 var(--space-3);
}

.site-footer a {
  color: #cfe3d1;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.footer-note {
  font-size: 0.85rem;
  color: #b7c0c6;
  border-top: 1px solid #4a5560;
  padding-top: var(--space-2);
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1) var(--space-3);
  margin: var(--space-2) 0;
  font-size: 0.85rem;
}

/* ---------- Legal page content ---------- */

.legal-content {
  max-width: 760px;
  margin: 0 auto;
}

.legal-content h2 {
  margin-top: var(--space-4);
}

.legal-content h2:first-child {
  margin-top: 0;
}

.legal-content ul {
  padding-left: 1.2rem;
  color: var(--color-text-muted);
  display: grid;
  gap: 0.4rem;
}

.legal-content .updated {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  margin-bottom: var(--space-3);
}

.notice {
  background: #fdf3e3;
  border: 1px solid #e4b95c;
  border-radius: var(--radius-md);
  padding: var(--space-2) var(--space-3);
  color: #7a5b12;
  font-size: 0.95rem;
  margin-bottom: var(--space-4);
}

.notice strong {
  color: #5c4409;
}

/* ---------- Forms ---------- */

.form-field {
  margin-bottom: var(--space-3);
}

.form-field label {
  display: block;
  font-weight: 700;
  color: var(--color-secondary);
  margin-bottom: 0.4rem;
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 1rem;
  padding: 0.7rem 0.9rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
}

.form-field input:focus-visible,
.form-field select:focus-visible,
.form-field textarea:focus-visible {
  outline: 3px solid var(--color-focus);
  outline-offset: 1px;
}

.form-honeypot {
  position: absolute;
  left: -9999px;
}