/* ===========================================================
   sathachlaixe.org — bright, modern, landing-page style
   Palette: iOS-blue #3A8DFF, exam-green #43CD87, die-red #EC3C1A
   ============================================================ */

:root {
  --blue: #3A8DFF;
  --blue-600: #1F73E3;
  --green: #43CD87;
  --red: #EC3C1A;
  --yellow: #FFC857;
  --purple: #6E5AE6;

  --bg: #FFFFFF;
  --bg-soft: #F6F8FB;
  --panel: #F2F2F4;
  --border: #E4E7EC;
  --ink: #1F2A36;
  --ink-soft: #4B5767;
  --muted: #8A93A0;

  --radius: 12px;
  --radius-lg: 20px;
  --shadow-sm: 0 2px 8px rgba(21, 36, 68, .06);
  --shadow-md: 0 10px 28px rgba(21, 36, 68, .08);

  --maxw: 1180px;
  --space: clamp(16px, 2vw, 24px);
}

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

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
               "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  font-size: 16px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--blue-600); text-decoration: none; }
a:hover { text-decoration: underline; }

h1, h2, h3, h4 { margin: 0 0 .4em; color: var(--ink); font-weight: 700; letter-spacing: -.01em; }
h1 { font-size: clamp(2rem, 4.2vw, 3rem); line-height: 1.15; }
h2 { font-size: clamp(1.4rem, 2.6vw, 2rem); }
h3 { font-size: 1.15rem; }
p  { margin: 0 0 .6em; }
.muted { color: var(--muted); }

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

.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; padding: 12px 20px; border-radius: 999px;
  font-weight: 600; font-size: 15px; border: 0; cursor: pointer;
  transition: transform .05s ease, box-shadow .15s ease, background .15s ease;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary  { background: var(--blue); color: #fff; box-shadow: var(--shadow-sm); }
.btn-primary:hover { background: var(--blue-600); }
.btn-ghost    { background: transparent; color: var(--ink); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--bg-soft); }
.btn-danger   { background: var(--red); color: #fff; }
.btn-lg  { padding: 16px 28px; font-size: 17px; }
.btn-compact { padding: 8px 16px; font-size: 14px; }
.btn[disabled] { opacity: .55; cursor: not-allowed; }

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

.site-header {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px var(--space);
  background: rgba(255,255,255,.88);
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  border-bottom: 1px solid var(--border);
}
.brand {
  display: inline-flex; align-items: center; gap: 10px;
  font-weight: 800; font-size: 18px; color: var(--ink);
}
.brand .dot { color: var(--blue); }
.brand-logo {
  border-radius: 8px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.12);
  object-fit: cover;
  display: block;
}
.primary-nav {
  display: flex; align-items: center; gap: 22px;
}
.primary-nav a { color: var(--ink-soft); font-weight: 500; }
.primary-nav a:hover { color: var(--ink); text-decoration: none; }
.primary-nav .btn { color: #fff; }

@media (max-width: 720px) {
  .primary-nav a:not(.btn) { display: none; }
}

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

.hero {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(40px, 6vw, 80px) var(--space) clamp(60px, 7vw, 90px);
  display: grid; grid-template-columns: 1.1fr .9fr; gap: 40px;
  align-items: center;
}
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(800px 400px at 90% 20%, rgba(58,141,255,.12), transparent 60%),
    radial-gradient(600px 300px at 10% 80%, rgba(67,205,135,.10), transparent 60%);
  z-index: -1;
}
.eyebrow {
  display: inline-block;
  font-size: 13px; font-weight: 600; letter-spacing: .02em;
  color: var(--blue-600);
  background: #EAF2FF;
  padding: 6px 12px; border-radius: 999px; margin: 0 0 18px;
}
.hero .lead { color: var(--ink-soft); font-size: 1.075rem; margin: 10px 0 24px; max-width: 52ch; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-bottom: 28px; }

.store-badges { display: flex; gap: 16px; flex-wrap: wrap; }
.store-badge {
  display: inline-flex; align-items: center; gap: 10px;
  background: #111; color: #fff; border-radius: 12px;
  padding: 10px 16px; text-decoration: none;
  transition: transform .15s ease, background .15s ease, box-shadow .15s ease;
}
.store-badge:hover { text-decoration: none; background: #222; transform: translateY(-1px); }
.store-badge span { display: flex; flex-direction: column; line-height: 1.15; }
.store-badge small { font-size: 10px; opacity: .85; letter-spacing: .04em; }
.store-badge strong { font-size: 14px; }

.store-badge-lg {
  gap: 14px;
  padding: 18px 28px;
  border-radius: 16px;
  min-height: 68px;
  box-shadow: 0 8px 22px rgba(0,0,0,0.18);
}
.store-badge-lg small { font-size: 13px; }
.store-badge-lg strong { font-size: 22px; letter-spacing: .01em; }
.store-badge-lg .store-ico { flex-shrink: 0; }
.store-badge-lg:hover { box-shadow: 0 10px 26px rgba(0,0,0,0.24); }
@media (max-width: 480px) {
  .store-badge-lg { padding: 14px 20px; min-height: 60px; gap: 12px; }
  .store-badge-lg small { font-size: 11px; }
  .store-badge-lg strong { font-size: 18px; }
  .store-badge-lg .store-ico { width: 34px !important; height: 34px !important; }
}

.hero-art {
  position: relative; height: 100%; min-height: 340px;
}
.hero-card {
  position: absolute; display: flex; align-items: center; gap: 12px;
  background: #fff; border: 1px solid var(--border);
  padding: 16px 18px; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  min-width: 220px;
}
.hero-card strong { display: block; font-size: 18px; color: var(--ink); }
.hero-card small  { display: block; font-size: 12px; color: var(--muted); }
.card-dot { width: 12px; height: 12px; border-radius: 50%; }
.hero-card-1 { top: 10%;  left: 10%; transform: rotate(-3deg); }
.hero-card-2 { top: 45%;  right: 5%; transform: rotate(2deg); }
.hero-card-3 { bottom: 8%; left: 25%; transform: rotate(-1deg); }

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; }
  .hero-art { display: none; }
}

/* ------------------------ Features ------------------------ */

.features, .licenses-band, .faq, .cta-band {
  max-width: var(--maxw); margin: 0 auto;
  padding: clamp(50px, 6vw, 80px) var(--space);
}
.section-lead { color: var(--ink-soft); max-width: 60ch; margin-bottom: 30px; }

.feature-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px;
}
.feature {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 22px; transition: transform .15s ease, box-shadow .15s ease;
}
.feature:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.feature-ico {
  width: 44px; height: 44px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px; margin-bottom: 14px;
}
.feature h3 { margin-bottom: 6px; }
.feature p  { color: var(--ink-soft); margin: 0; font-size: .97rem; }

/* ------------------------ Licenses band ------------------------ */

.licenses-band { background: var(--bg-soft); border-radius: var(--radius-lg); }
.chip-row { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 18px; border-radius: 999px;
  background: #fff; border: 1px solid var(--border);
  color: var(--ink); font-weight: 600; font-size: 15px;
  text-decoration: none;
  transition: transform .08s ease, background .15s ease, color .15s ease;
}
.chip:hover { background: var(--blue); color: #fff; text-decoration: none; transform: translateY(-1px); }
.chip-hot { background: var(--blue); color: #fff; border-color: var(--blue); }

/* ------------------------ FAQ ------------------------ */

.faq details {
  border-top: 1px solid var(--border); padding: 18px 0;
}
.faq details:last-of-type { border-bottom: 1px solid var(--border); }
.faq summary {
  cursor: pointer; list-style: none; font-weight: 600; font-size: 1.05rem;
  display: flex; justify-content: space-between; gap: 12px;
}
.faq summary::after {
  content: "+"; font-size: 22px; color: var(--muted); transition: transform .15s ease;
}
.faq details[open] summary::after { content: "–"; }
.faq details p { color: var(--ink-soft); margin-top: 10px; }

/* ------------------------ CTA band ------------------------ */

.cta-band {
  text-align: center;
  background: linear-gradient(135deg, #EAF2FF, #F0FFF6);
  border-radius: var(--radius-lg);
  padding: 60px var(--space);
  margin-bottom: 40px;
}
.cta-band h2 { margin-bottom: 10px; }
.cta-band p { color: var(--ink-soft); margin-bottom: 22px; }

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

.site-footer {
  border-top: 1px solid var(--border);
  background: #FAFBFD;
}
.footer-inner {
  max-width: var(--maxw); margin: 0 auto;
  padding: 40px var(--space) 20px;
  display: grid; grid-template-columns: 2fr 1fr 1.3fr; gap: 40px;
}
.site-footer .brand { margin-bottom: 8px; }
.site-footer h4 { font-size: 14px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 10px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: var(--ink-soft); }
.footer-bottom {
  max-width: var(--maxw); margin: 0 auto;
  padding: 14px var(--space); border-top: 1px solid var(--border);
  color: var(--muted); font-size: 13px; text-align: center;
}
@media (max-width: 700px) { .footer-inner { grid-template-columns: 1fr; gap: 24px; } }

/* ============================================================
   App (SPA) — app.html
   ============================================================ */

body.app {
  background: var(--bg-soft);
  min-height: 100vh;
}

/* Top bar */
.app-bar {
  position: sticky; top: 0; z-index: 10;
  background: #fff; border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px;
}
.app-bar .icon-btn {
  width: 40px; height: 40px; border: 0; background: transparent; cursor: pointer;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  color: var(--ink);
}
.app-bar .icon-btn:hover { background: var(--panel); }
.app-bar-brand {
  display: inline-flex; align-items: center; justify-content: center;
  width: 40px; height: 40px; border-radius: 50%;
  text-decoration: none; flex-shrink: 0;
}
.app-bar-brand:hover { background: var(--panel); text-decoration: none; }
.app-bar-brand .brand-logo { width: 30px; height: 30px; border-radius: 7px; }
.app-bar h1 {
  font-size: 18px; margin: 0 auto 0 6px; font-weight: 700;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.app-bar .app-bar-trailing { margin-left: auto; display: inline-flex; gap: 6px; }

.app-main {
  max-width: 720px; margin: 0 auto; padding: 16px; padding-bottom: 90px;
}

/* Bottom nav */
.bottom-nav {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 10;
  display: flex; background: #fff; border-top: 1px solid var(--border);
  padding: 6px env(safe-area-inset-right) calc(6px + env(safe-area-inset-bottom)) env(safe-area-inset-left);
}
.bottom-nav a {
  flex: 1; text-align: center; padding: 8px 4px;
  color: var(--muted); text-decoration: none; font-size: 12px;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
}
.bottom-nav a:hover { text-decoration: none; }
.bottom-nav a.active { color: var(--blue); }
.bottom-nav svg { width: 22px; height: 22px; }

/* Cards / lists */
.card {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 14px; margin-bottom: 10px;
}
.list-item {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 12px; background: #fff;
  border: 1px solid var(--border); border-radius: var(--radius);
  margin-bottom: 10px; cursor: pointer;
  transition: background .15s ease;
}
.list-item:hover { background: var(--bg-soft); }
.list-item .circle {
  width: 44px; height: 44px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-weight: 700; font-size: 16px; flex: none;
}
.list-item .title { font-weight: 600; color: var(--ink); }
.list-item .sub { font-size: 13px; color: var(--muted); }
.list-item .pill {
  margin-left: auto; background: var(--blue); color: #fff; font-weight: 600;
  font-size: 13px; padding: 5px 10px; border-radius: 10px; white-space: nowrap;
}
.progress-bar {
  height: 6px; background: #D9D9D9; border-radius: 3px; overflow: hidden; margin-top: 6px;
}
.progress-bar > span {
  display: block; height: 100%; background: var(--green); border-radius: 3px;
}

/* Home hero */
.home-hero {
  background: linear-gradient(135deg, #3A8DFF, #6E5AE6);
  color: #fff; border-radius: var(--radius-lg);
  padding: 22px; margin-bottom: 16px;
  box-shadow: var(--shadow-sm);
}
.home-hero h2 { color: #fff; margin: 0 0 6px; font-size: 22px; }
.home-hero p  { margin: 0; opacity: .92; }
.level-switch {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.22); padding: 8px 14px;
  border-radius: 999px; margin-top: 14px; color: #fff; font-weight: 700;
  cursor: pointer; border: 0;
}

.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; }

.home-tile {
  background: #fff; border: 1px solid var(--border);
  border-radius: var(--radius); padding: 16px;
  text-align: center; cursor: pointer; text-decoration: none; color: var(--ink);
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  transition: transform .1s ease, box-shadow .15s ease;
}
.home-tile:hover { transform: translateY(-2px); box-shadow: var(--shadow-sm); text-decoration: none; }
.home-tile .tile-ico {
  width: 48px; height: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 22px;
}
.home-tile strong { font-size: 14px; }
.home-tile small  { font-size: 12px; color: var(--muted); }

/* License picker modal */
.overlay {
  position: fixed; inset: 0; background: rgba(10, 20, 40, .45);
  display: none; align-items: center; justify-content: center; z-index: 50;
  padding: 16px;
}
.overlay.show { display: flex; }
.modal {
  background: #fff; border-radius: var(--radius-lg);
  width: 100%; max-width: 520px; max-height: 80vh; overflow: hidden;
  display: flex; flex-direction: column;
  box-shadow: 0 20px 50px rgba(0,0,0,.25);
}
.modal-head {
  padding: 16px 18px; border-bottom: 1px solid var(--border);
  display: flex; justify-content: space-between; align-items: center;
}
.modal-body { overflow: auto; padding: 10px 12px; }
.modal-foot { padding: 12px; border-top: 1px solid var(--border); text-align: right; }
.level-row {
  display: flex; align-items: center; gap: 12px;
  padding: 12px; border-radius: 10px; cursor: pointer;
}
.level-row:hover { background: var(--bg-soft); }
.level-row.active { background: #EAF2FF; }
.level-row .level-name {
  width: 54px; height: 54px; border-radius: 12px;
  background: var(--blue); color: #fff; font-weight: 800;
  display: flex; align-items: center; justify-content: center; font-size: 18px; flex: none;
}
.level-row .level-detail { font-size: 13px; color: var(--muted); }

/* Quiz */
.quiz-topbar {
  display: flex; gap: 12px; align-items: center;
  background: #fff; padding: 10px 14px; border-radius: var(--radius);
  border: 1px solid var(--border); margin-bottom: 12px;
}
.quiz-topbar .timer {
  background: var(--red); color: #fff; padding: 6px 12px; border-radius: 999px;
  font-weight: 700; font-variant-numeric: tabular-nums;
}
.quiz-q {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; margin-bottom: 14px;
}
.quiz-q .q-idx {
  display: inline-block; background: var(--blue); color: #fff;
  font-size: 12px; padding: 3px 9px; border-radius: 999px; margin-bottom: 10px; font-weight: 700;
}
.quiz-q .q-content { font-size: 1.05rem; font-weight: 500; margin-bottom: 12px; color: var(--ink); }
.quiz-q img { max-width: 100%; border-radius: 8px; margin-bottom: 12px; }
.option {
  display: flex; gap: 10px; padding: 12px 14px;
  border: 1.5px solid var(--border); border-radius: 10px;
  background: #fff; cursor: pointer; margin-bottom: 8px;
  transition: background .1s ease, border-color .1s ease;
}
.option:hover { background: var(--bg-soft); }
.option.chosen { border-color: var(--blue); background: #EAF2FF; }
.option.correct { border-color: var(--green); background: #E7F7EF; }
.option.wrong { border-color: var(--red); background: #FDE9E4; }
.option .letter {
  width: 24px; height: 24px; border-radius: 50%;
  background: var(--panel); font-weight: 700; font-size: 13px;
  display: inline-flex; align-items: center; justify-content: center; flex: none;
}
.option.chosen .letter { background: var(--blue); color: #fff; }
.option.correct .letter { background: var(--green); color: #fff; }
.option.wrong .letter { background: var(--red); color: #fff; }

.explanation {
  margin-top: 12px; padding: 12px; border-left: 3px solid var(--yellow);
  background: #FFF9E6; border-radius: 6px; font-size: .95rem;
}

.quiz-nav {
  display: flex; gap: 10px; justify-content: space-between;
  background: #fff; padding: 10px; border-radius: var(--radius);
  border: 1px solid var(--border); margin-top: 14px;
}

.q-grid {
  display: grid; grid-template-columns: repeat(8, 1fr); gap: 6px;
  background: #fff; padding: 10px; border-radius: var(--radius);
  border: 1px solid var(--border); margin-bottom: 12px;
}
.q-cell {
  aspect-ratio: 1 / 1; border-radius: 8px; display: flex; align-items: center; justify-content: center;
  background: var(--panel); font-weight: 700; font-size: 13px; cursor: pointer; color: var(--ink);
  border: 2px solid transparent;
}
.q-cell.answered { background: #E2EFFF; color: var(--blue-600); }
.q-cell.correct  { background: var(--green); color: #fff; }
.q-cell.wrong    { background: var(--red); color: #fff; }
.q-cell.current  { border-color: var(--blue); }

/* Result */
.result-hero {
  background: linear-gradient(135deg, #43CD87, #2BB673);
  color: #fff; border-radius: var(--radius-lg); padding: 26px; text-align: center;
  margin-bottom: 16px;
}
.result-hero.fail { background: linear-gradient(135deg, #EC3C1A, #C72B0A); }
.result-hero h2 { color: #fff; margin: 0 0 6px; font-size: 26px; }
.result-hero .score {
  font-size: 40px; font-weight: 800; letter-spacing: -.02em;
  display: block; margin: 6px 0;
}
.result-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 14px; background: #fff;
  border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 8px;
}

/* Signs / Tips / Maps layout */
.sign-card {
  display: flex; gap: 12px; align-items: center;
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
  padding: 10px 12px; margin-bottom: 8px;
}
.sign-card img { width: 64px; height: 64px; object-fit: contain; background: var(--bg-soft); border-radius: 8px; flex: none; }
.sign-card .s-title { font-weight: 700; }
.sign-card .s-code  { font-size: 12px; color: var(--muted); }
.sign-card .s-more  { font-size: 13px; color: var(--ink-soft); margin-top: 4px; }

.map-card, .tip-card { padding: 14px; background: #fff; border: 1px solid var(--border); border-radius: var(--radius); margin-bottom: 10px; }
.map-card h3 { font-size: 1rem; margin-bottom: 4px; }
.map-card img { max-width: 100%; border-radius: 8px; margin-top: 10px; }
.map-card p { white-space: pre-line; color: var(--ink-soft); margin: 0; font-size: .95rem; }
.tip-card p { margin: 0; color: var(--ink); font-size: .98rem; }

/* Stats */
.stat-tile {
  background: #fff; border: 1px solid var(--border); border-radius: var(--radius); padding: 14px;
  text-align: center;
}
.stat-tile strong { display: block; font-size: 22px; color: var(--ink); }
.stat-tile small  { color: var(--muted); font-size: 12px; }

/* Utility */
.spacer-16 { height: 16px; }
.center { text-align: center; }
.row { display: flex; gap: 10px; align-items: center; }
.grow { flex: 1; }
.hidden { display: none !important; }

.badge-red   { background: var(--red);    color: #fff; padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 700; }
.badge-green { background: var(--green);  color: #fff; padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 700; }
.badge-gray  { background: var(--panel);  color: var(--ink-soft); padding: 2px 8px; border-radius: 10px; font-size: 11px; font-weight: 700; }

/* Loading */
.loading {
  display: flex; align-items: center; justify-content: center;
  padding: 60px 0; color: var(--muted);
}
.spinner {
  width: 28px; height: 28px; border: 3px solid var(--panel); border-top-color: var(--blue);
  border-radius: 50%; animation: spin .8s linear infinite; margin-right: 10px;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Small-screens */
@media (max-width: 480px) {
  .q-grid { grid-template-columns: repeat(6, 1fr); }
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
}