/* ── Bilue design tokens (verbatim from bilue.webflow.shared CSS) ──── */
:root {
  /* Brand */
  --bilue-primary:      #00a1ff;
  --bilue-blue:         #1a96f8;
  --bilue-blue-light:   #7acfff;
  --bilue-blue-lighter: #eef9ff;
  --android-green:      #3ddc84;
  --android-dark:       #1a9a60;

  /* Bilue's neutral scale (Untitled UI grays) */
  --gray-900: #101828;
  --gray-800: #1d2939;
  --gray-700: #344054;
  --gray-600: #475467;
  --gray-500: #667085;
  --gray-400: #98a2b3;
  --gray-300: #d0d5dd;
  --gray-200: #eaecf0;
  --gray-100: #f2f4f7;
  --gray-50:  #f9fafb;

  /* Bilue-specific named tokens */
  --text-dark:     #0a2540;   /* --text-dark */
  --border-subtle: #dde1e6;   /* --gray-c1 */
  --eyebrow-color: #adb5bd;   /* --gray-c3, used for section labels */
  --lightest-bg:   #f6f9fc;   /* --bilue-lightest-bg */
  --beige-100:     #f7f6f5;   /* --b261-beige-100, warm off-white */

  /* Fonts */
  --font-display: 'Manrope', sans-serif;
  --font-body:    'Inter', sans-serif;
}

/* ── Light theme ─────────────────────────────────────────────────────── */
:root, [data-theme="light"] {
  --bg:             #ffffff;
  --bg-subtle:      var(--lightest-bg);
  --bg-raised:      var(--gray-50);
  --surface:        #ffffff;
  --border:         var(--gray-200);
  --border-card:    var(--border-subtle);
  --text-primary:   var(--text-dark);
  --text-secondary: var(--gray-500);
  --text-muted:     var(--gray-400);
  --text-eyebrow:   var(--eyebrow-color);
  --nav-bg:         #ffffff;
  --nav-cta-bg:     var(--gray-900);
  --footer-bg:      var(--gray-800);
  --footer-link:    var(--gray-500);
  --footer-dim:     var(--gray-400);
  --ios-tint-bg:    var(--bilue-blue-lighter);
  --ios-tint-bd:    var(--bilue-blue-light);
  --and-tint-bg:    #eafaf2;
  --and-tint-bd:    #86efac;
  --empty-bg:       var(--gray-50);
  --toggle-track:   var(--gray-100);
  --toggle-thumb:   #ffffff;
  --toggle-border:  var(--gray-200);
}

/* ── Dark theme ──────────────────────────────────────────────────────── */
[data-theme="dark"] {
  --bg:             #0d1219;
  --bg-subtle:      #111b27;
  --bg-raised:      #0f1923;
  --surface:        #111b27;
  --border:         #1e3048;
  --border-card:    #253f5c;
  --text-primary:   #e2eaf4;
  --text-secondary: #8ba3bd;
  --text-muted:     #5d7d99;
  --text-eyebrow:   #3a5770;
  --nav-bg:         #0d1219;
  --nav-cta-bg:     #162030;
  --footer-bg:      #070d16;
  --footer-link:    #5d7d99;
  --footer-dim:     #3a5770;
  --ios-tint-bg:    #0d2140;
  --ios-tint-bd:    #1a6bb5;
  --and-tint-bg:    #0d2018;
  --and-tint-bd:    #1a6640;
  --empty-bg:       #0f1923;
  --toggle-track:   #162030;
  --toggle-thumb:   #1e3048;
  --toggle-border:  #1e3048;
  --bilue-blue:     #3aaaff;
  --bilue-primary:  #3aaaff;
  --bilue-blue-light: #1a6bb5;
  --android-dark:   #2dbc80;
}

/* ── Reset ───────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; -webkit-font-smoothing: antialiased; color-scheme: light; }
[data-theme="dark"] { color-scheme: dark; }

body {
  background: var(--bg);
  color: var(--text-primary);
  font-family: var(--font-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background .2s, color .2s;
}

/* ── Nav ─────────────────────────────────────────────────────────────── */
.nav {
  background: var(--nav-bg);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background .2s, border-color .2s;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: .875rem;
  text-decoration: none;
  cursor: pointer;
  user-select: none;
}
/* Bilue logo mark: blue square with 9px radius, matching b26-bilue-logo-image */
.nav-logo {
  width: 40px;
  height: 40px;
  background: var(--bilue-primary);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background .2s;
}
.nav-logo img { width: 26px; }

.nav-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -.02em;
}
.nav-title span { color: var(--bilue-blue); }

.nav-right { display: flex; align-items: center; gap: .625rem; }

/* "Internal" pill — styled like b26-desktop-nav-btn (dark pill) */
.nav-badge {
  font-family: var(--font-body);
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .01em;
  color: #fff;
  background: var(--nav-cta-bg);
  padding: .4rem .9rem;
  border-radius: 2.5rem;
  white-space: nowrap;
  transition: background .2s;
}

/* ── Theme toggle ────────────────────────────────────────────────────── */
.theme-toggle {
  display: flex;
  align-items: center;
  background: var(--toggle-track);
  border: 1px solid var(--toggle-border);
  border-radius: 2rem;
  padding: 2px;
  gap: 1px;
  transition: background .2s, border-color .2s;
}
.theme-btn {
  width: 30px;
  height: 30px;
  border: none;
  background: none;
  cursor: pointer;
  border-radius: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: background .12s, color .12s;
}
.theme-btn svg { width: 14px; height: 14px; }
.theme-btn.active {
  background: var(--toggle-thumb);
  color: var(--text-primary);
  box-shadow: 0 1px 3px rgba(0,0,0,.12);
}
.theme-btn:focus-visible { outline: 2px solid var(--bilue-blue); outline-offset: 2px; }

/* ── Views ───────────────────────────────────────────────────────────── */
.view { display: none; flex: 1; flex-direction: column; }
.view.active { display: flex; }

/* ── Hero ────────────────────────────────────────────────────────────── */
.hero {
  background: #ffffff;
  padding: 5rem 2rem 4.5rem;
  transition: background .2s;
}
[data-theme="dark"] .hero { background: var(--bg); }

.hero-inner { max-width: 1200px; margin: 0 auto; }

/* Eyebrow — matches b26-footer-pretitle style: uppercase, tracking, muted */
.p-pretitle {
  font-family: var(--font-body);
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .15em;
  color: var(--bilue-blue);
  margin-bottom: 1.25rem;
}

.hero-heading {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4.5vw, 3.5rem);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -.035em;
  color: var(--text-primary);
  margin-bottom: 1.25rem;
  max-width: 700px;
}

.hero-sub {
  font-family: var(--font-body);
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 520px;
}

/* ── Platform Selection section ──────────────────────────────────────── */
.platforms-section {
  flex: 1;
  background: var(--bg-subtle);
  padding: 4rem 2rem 5rem;
  border-top: 1px solid var(--border);
  transition: background .2s, border-color .2s;
}
.platforms-inner { max-width: 1200px; margin: 0 auto; }

/* Section eyebrow — matches Bilue's section label pattern */
.section-eyebrow {
  font-family: var(--font-body);
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .15em;
  color: var(--text-eyebrow);
  margin-bottom: .75rem;
}
.section-heading {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  font-weight: 700;
  letter-spacing: -.025em;
  color: var(--text-primary);
  margin-bottom: 2.5rem;
}

.platform-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.5rem;
  max-width: 720px;
}

/* Platform card — modelled on Bilue's b26-service-promise card */
.platform-card {
  background: var(--surface);
  border: 1px solid var(--border-card);
  border-radius: 1.5rem;
  padding: 2.25rem 2rem 2rem;
  cursor: pointer;
  transition: border-color .18s, box-shadow .18s, transform .18s, background .2s;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  user-select: none;
}
.platform-card:hover {
  box-shadow: 0 8px 32px rgba(26,150,248,.1);
  transform: translateY(-3px);
}
.platform-card:active { transform: translateY(0); }
.platform-card.ios:hover  { border-color: var(--bilue-blue); }
.platform-card.android:hover { border-color: var(--android-green); }
.platform-card:focus-visible { outline: 2px solid var(--bilue-blue); outline-offset: 3px; }

.platform-icon {
  width: 60px;
  height: 60px;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.platform-card.ios     .platform-icon { background: #000; }
.platform-card.android .platform-icon { background: var(--android-green); }
.platform-icon svg { width: 34px; height: 34px; }
/* Android head SVG is landscape (152×89); sized to match Apple logo visual weight */
.platform-icon svg.android-svg { width: 40px; height: auto; }

.platform-card-name {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -.02em;
  margin-bottom: .35rem;
}
.platform-card-meta {
  font-family: var(--font-body);
  font-size: .85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* CTA — styled like b26-hero-btn-small: pill, solid blue */
.platform-card-cta {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  font-family: var(--font-body);
  font-size: .85rem;
  font-weight: 600;
  color: #fff;
  background: var(--bilue-primary);
  padding: .65rem 1.25rem .65rem 1.15rem;
  border-radius: 8rem;
  align-self: flex-start;
  margin-top: auto;
  transition: opacity .14s, transform .14s;
}
.platform-card.android .platform-card-cta {
  background: var(--android-dark);
}
.platform-card-cta svg { width: 14px; height: 14px; transition: transform .14s; }
.platform-card:hover .platform-card-cta { opacity: .88; }
.platform-card:hover .platform-card-cta svg { transform: translateX(3px); }

/* ── Weekly view header ───────────────────────────────────────────────── */
.weekly-hero {
  background: #ffffff;
  border-bottom: 1px solid var(--border);
  padding: 2.5rem 2rem;
  transition: background .2s, border-color .2s;
}
[data-theme="dark"] .weekly-hero { background: var(--bg); }
.weekly-hero-inner { max-width: 1200px; margin: 0 auto; }

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  font-family: var(--font-body);
  font-size: .8rem;
  font-weight: 600;
  color: var(--text-muted);
  background: none;
  border: none;
  cursor: pointer;
  padding: .3rem 0;
  margin-bottom: 1.5rem;
  transition: color .12s;
}
.back-btn:hover { color: var(--text-primary); }
.back-btn svg { width: 15px; height: 15px; }

.weekly-platform-header { display: flex; align-items: center; gap: 1.25rem; }

.weekly-platform-icon {
  width: 56px;
  height: 56px;
  border-radius: 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.weekly-platform-icon.ios     { background: #000; }
.weekly-platform-icon.android { background: var(--android-green); }
.weekly-platform-icon svg { width: 32px; height: 32px; }
.weekly-platform-icon.android svg { width: 38px; height: auto; }

.weekly-platform-pretitle {
  font-family: var(--font-body);
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .15em;
  color: var(--text-eyebrow);
  margin-bottom: .3rem;
}
.weekly-platform-name {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1.15;
}
.weekly-platform-name.ios     { color: var(--bilue-blue); }
.weekly-platform-name.android { color: var(--android-dark); }

/* ── Weeks list ──────────────────────────────────────────────────────── */
.weeks-section {
  background: var(--bg-subtle);
  padding: 2.5rem 2rem 5rem;
  flex: 1;
  transition: background .2s;
}
.weeks-inner { max-width: 1200px; margin: 0 auto; }
.weeks-list { display: flex; flex-direction: column; gap: 1.25rem; }

/* Week card */
.week-card {
  background: var(--surface);
  border: 1px solid var(--border-card);
  border-radius: 1rem;
  overflow: hidden;
  transition: background .2s, border-color .2s;
}

.week-header {
  padding: 1.1rem 1.75rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
  transition: border-color .2s;
}

.week-badge {
  font-family: var(--font-display);
  font-size: .65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  padding: .28rem .75rem;
  border-radius: 2rem;
  white-space: nowrap;
  flex-shrink: 0;
}
.week-badge.default { color: var(--text-muted);  background: var(--bg-raised); border: 1px solid var(--border); }
.week-badge.ios     { color: #fff;                background: var(--bilue-blue); }
.week-badge.android { color: #0a2540;             background: var(--android-green); }

.week-title {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -.015em;
}

.week-codelab-pill {
  margin-left: auto;
  flex-shrink: 0;
  font-size: .65rem;
  font-weight: 600;
  padding: .25rem .65rem;
  border-radius: 2rem;
}
.week-codelab-pill.ios {
  color: var(--bilue-blue);
  background: var(--ios-tint-bg);
  border: 1px solid var(--ios-tint-bd);
}
.week-codelab-pill.android {
  color: var(--android-dark);
  background: var(--and-tint-bg);
  border: 1px solid var(--and-tint-bd);
}

.week-body {
  padding: 1.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.week-description {
  font-family: var(--font-body);
  font-size: .875rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ── Codelab card ────────────────────────────────────────────────────── */
.codelab-card {
  display: block;
  text-decoration: none;
  background: var(--bg-raised);
  border: 1px solid var(--border);
  border-radius: .75rem;
  padding: 1.25rem 1.5rem 1.1rem;
  transition: border-color .14s, box-shadow .14s, background .14s;
}
.codelab-card.ios:hover {
  border-color: var(--ios-tint-bd);
  background: var(--ios-tint-bg);
  box-shadow: 0 0 0 3px rgba(26,150,248,.08);
}
.codelab-card.android:hover {
  border-color: var(--and-tint-bd);
  background: var(--and-tint-bg);
  box-shadow: 0 0 0 3px rgba(61,220,132,.08);
}
.codelab-card:focus-visible { outline: 2px solid var(--bilue-blue); outline-offset: 2px; }

.card-pretitle {
  font-family: var(--font-body);
  font-size: .65rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .12em;
  margin-bottom: .5rem;
}
.card-pretitle.ios     { color: var(--bilue-blue); }
.card-pretitle.android { color: var(--android-dark); }

.card-title {
  font-family: var(--font-display);
  font-size: .95rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.45;
  margin-bottom: .875rem;
  letter-spacing: -.015em;
}

.card-tags { display: flex; flex-wrap: wrap; gap: .35rem; margin-bottom: 1rem; }
.tag {
  font-size: .6rem;
  font-weight: 600;
  letter-spacing: .03em;
  padding: .2rem .6rem;
  border-radius: 2rem;
  border: 1px solid transparent;
  line-height: 1.5;
}
.codelab-card.ios     .tag { color: var(--bilue-blue);   background: var(--ios-tint-bg); border-color: var(--ios-tint-bd); }
.codelab-card.android .tag { color: var(--android-dark); background: var(--and-tint-bg); border-color: var(--and-tint-bd); }

.card-footer { display: flex; align-items: center; justify-content: space-between; }
.card-duration { font-size: .78rem; color: var(--text-muted); font-weight: 500; }

/* Start button — .b26-btn style: small radius, solid */
.card-cta {
  font-family: var(--font-body);
  font-size: .78rem;
  font-weight: 600;
  color: #fff;
  padding: .45rem 1rem;
  border-radius: .5rem;
  transition: opacity .12s;
}
.card-cta.ios     { background: var(--bilue-blue); }
.card-cta.android { background: var(--android-dark); }
.codelab-card:hover .card-cta { opacity: .88; }

/* ── Coming soon ─────────────────────────────────────────────────────── */
.week-empty {
  display: flex;
  align-items: center;
  gap: .875rem;
  padding: .875rem 1.125rem;
  background: var(--empty-bg);
  border: 1px dashed var(--border);
  border-radius: .625rem;
  transition: background .2s, border-color .2s;
}
.week-empty-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--border-card);
  flex-shrink: 0;
}
.week-empty-text {
  font-size: .82rem;
  color: var(--text-muted);
  font-family: var(--font-body);
}

/* ── Loading / error ─────────────────────────────────────────────────── */
.state-msg {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: .9rem;
  padding: 5rem 2rem;
  font-family: var(--font-body);
}

/* ── Footer ──────────────────────────────────────────────────────────── */
/* Matches Bilue's dark footer (#1d2939) */
.site-footer {
  background: var(--footer-bg);
  padding: 2rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  transition: background .2s;
}

.footer-brand { display: flex; align-items: center; gap: .75rem; }
.footer-logo {
  width: 32px;
  height: 32px;
  background: var(--bilue-primary);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.footer-logo img { width: 22px; }

/* "Bilue Academy" — matches b26-footer-tagline weight/style */
.footer-name {
  font-family: var(--font-display);
  font-size: .9rem;
  font-weight: 700;
  color: #fff;
  letter-spacing: -.01em;
}
.footer-name span { color: var(--bilue-blue-light); }

.footer-links { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
.footer-link {
  font-family: var(--font-body);
  font-size: .72rem;
  color: var(--footer-link);
  text-decoration: none;
  transition: color .12s;
}
.footer-link:hover { color: #fff; }

/* ── Responsive ──────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  .hero { padding: 3.5rem 1.5rem 3rem; }
  .platforms-section,
  .weekly-hero,
  .weeks-section { padding-left: 1.5rem; padding-right: 1.5rem; }
  .nav, .site-footer { padding-left: 1.5rem; padding-right: 1.5rem; }
  .platform-cards { grid-template-columns: 1fr; }
  .nav-badge { display: none; }
  .week-header, .week-body { padding-left: 1.25rem; padding-right: 1.25rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}