/* quizsnap — design system. Distinctive emerald + coral on warm paper. No CDN, no build. */
:root {
  --ink: #16130f;
  --ink-2: #5b554d;
  --ink-3: #9b958c;
  --paper: #faf8f3;
  --card: #ffffff;
  --line: #e9e3d8;
  --green: #0e7c66;
  --green-d: #0a5c4b;
  --green-l: #e3f3ee;
  --coral: #ff6b4a;
  --coral-d: #e8512f;
  --yellow: #ffd24a;
  --shadow: 0 1px 2px rgba(20, 17, 14, 0.04), 0 8px 24px rgba(20, 17, 14, 0.06);
  --radius: 16px;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
body.has-bg { background:
  radial-gradient(900px 500px at 100% -10%, #eef7f3 0%, transparent 60%),
  radial-gradient(700px 500px at -10% 110%, #fdeee9 0%, transparent 55%),
  var(--paper);
}
a { color: var(--green-d); }
h1, h2, h3 { line-height: 1.12; letter-spacing: -0.02em; }

/* header / footer */
.site-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 22px; max-width: 1040px; margin: 0 auto;
}
.brand {
  font-weight: 800; font-size: 22px; letter-spacing: -0.03em;
  text-decoration: none; color: var(--ink);
}
.brand span { color: var(--green); }
.site-footer {
  max-width: 1040px; margin: 64px auto 0; padding: 28px 22px 48px;
  border-top: 1px solid var(--line); color: var(--ink-3); font-size: 14px;
}
.site-footer a { color: var(--ink-2); text-decoration: none; }

/* buttons */
.btn {
  display: inline-flex; align-items: center; gap: 8px; justify-content: center;
  background: var(--card); color: var(--ink); border: 1px solid var(--line);
  padding: 12px 20px; border-radius: 12px; font-weight: 650; font-size: 16px;
  text-decoration: none; cursor: pointer; transition: transform .06s ease, box-shadow .15s ease;
  box-shadow: var(--shadow);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn-accent { background: var(--coral); border-color: var(--coral); color: #fff; }
.btn-accent:hover { background: var(--coral-d); }
.btn-green { background: var(--green); border-color: var(--green); color: #fff; }
.btn-green:hover { background: var(--green-d); }
.btn-ghost { background: transparent; box-shadow: none; }
.btn-sm { padding: 8px 14px; font-size: 14px; border-radius: 10px; }
.btn[disabled] { opacity: .55; pointer-events: none; }

.page { max-width: 760px; margin: 0 auto; padding: 12px 22px 0; }
.cta-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 26px; }
.center-page { text-align: center; padding-top: 60px; }
.center-page h1 { font-size: 72px; margin: 0; color: var(--green); }

/* ---------- landing ---------- */
.hero { max-width: 980px; margin: 0 auto; padding: 40px 22px 16px; text-align: center; }
.eyebrow {
  display: inline-block; background: var(--green-l); color: var(--green-d);
  font-weight: 650; font-size: 13px; padding: 6px 12px; border-radius: 999px; margin-bottom: 22px;
}
.hero h1 { font-size: clamp(36px, 7vw, 64px); margin: 0 0 18px; font-weight: 850; }
.hero h1 .hl { color: var(--green); position: relative; white-space: nowrap; }
.hero h1 .hl::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 4px; height: 12px;
  background: var(--yellow); opacity: .6; z-index: -1; border-radius: 4px;
}
.hero p.sub { font-size: clamp(17px, 2.4vw, 21px); color: var(--ink-2); max-width: 620px; margin: 0 auto 30px; }
.hero .cta-row { justify-content: center; }
.hero-note { margin-top: 16px; color: var(--ink-3); font-size: 14px; }

.demo {
  max-width: 720px; margin: 44px auto 0; background: var(--card); border: 1px solid var(--line);
  border-radius: 22px; box-shadow: var(--shadow); overflow: hidden;
}
.demo-bar { display: flex; gap: 6px; padding: 14px 16px; border-bottom: 1px solid var(--line); }
.demo-bar i { width: 11px; height: 11px; border-radius: 50%; background: var(--line); display: block; }
.demo-bar i:nth-child(1){ background:#ff6b5e } .demo-bar i:nth-child(2){ background:#ffd24a } .demo-bar i:nth-child(3){ background:#36c98b }
.demo-body { display: grid; grid-template-columns: 1fr 1fr; gap: 0; }
.demo-photo {
  background: repeating-linear-gradient(0deg, #fffdf6, #fffdf6 26px, #eef0e6 27px), #fffdf6;
  padding: 26px; border-right: 1px solid var(--line); min-height: 220px;
  font-family: "Comic Sans MS", "Segoe Print", cursive; color: #4a463d;
}
.demo-photo h4 { margin: 0 0 12px; font-size: 18px; }
.demo-photo ul { margin: 0; padding-left: 18px; }
.demo-photo li { margin-bottom: 10px; }
.demo-quiz { padding: 24px; }
.demo-quiz .q { font-weight: 700; margin: 0 0 14px; }
.demo-opt { display: block; border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; margin-bottom: 8px; font-size: 14px; }
.demo-opt.correct { border-color: var(--green); background: var(--green-l); color: var(--green-d); font-weight: 650; }
@media (max-width: 560px) { .demo-body { grid-template-columns: 1fr; } .demo-photo { border-right: 0; border-bottom: 1px solid var(--line); } }

.features { max-width: 980px; margin: 70px auto 0; padding: 0 22px; display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.feature .ic { font-size: 26px; }
.feature h3 { margin: 12px 0 6px; font-size: 18px; }
.feature p { margin: 0; color: var(--ink-2); font-size: 15px; }
@media (max-width: 720px) { .features { grid-template-columns: 1fr; } }

.steps { max-width: 760px; margin: 64px auto 0; padding: 0 22px; }
.steps h2, .pricing h2 { text-align: center; font-size: 30px; margin: 0 0 28px; }
.step { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 18px; }
.step .n { flex: none; width: 34px; height: 34px; border-radius: 50%; background: var(--green); color: #fff; font-weight: 800; display: grid; place-items: center; }
.step h3 { margin: 4px 0 4px; font-size: 18px; }
.step p { margin: 0; color: var(--ink-2); }

.pricing { max-width: 980px; margin: 80px auto 0; padding: 0 22px; }
.tiers { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.tier { background: var(--card); border: 1px solid var(--line); border-radius: 18px; padding: 26px; box-shadow: var(--shadow); }
.tier.feat { border-color: var(--green); border-width: 2px; position: relative; }
.tier.feat .badge { position: absolute; top: -12px; left: 26px; background: var(--green); color: #fff; font-size: 12px; font-weight: 700; padding: 4px 10px; border-radius: 999px; }
.tier h3 { margin: 0 0 4px; font-size: 20px; }
.tier .price { font-size: 34px; font-weight: 850; margin: 6px 0 2px; }
.tier .price small { font-size: 15px; font-weight: 500; color: var(--ink-3); }
.tier ul { list-style: none; padding: 0; margin: 16px 0 0; }
.tier li { padding: 6px 0 6px 24px; position: relative; color: var(--ink-2); font-size: 15px; }
.tier li::before { content: "✓"; position: absolute; left: 0; color: var(--green); font-weight: 800; }
@media (max-width: 720px) { .tiers { grid-template-columns: 1fr; } }

.final-cta { text-align: center; margin: 80px auto 0; padding: 0 22px; }
.final-cta h2 { font-size: 32px; margin: 0 0 18px; }

/* ---------- snap ---------- */
.snap-wrap { max-width: 620px; margin: 0 auto; padding: 18px 22px 0; }
.snap-wrap h1 { font-size: 30px; margin: 6px 0 6px; }
.snap-wrap .sub { color: var(--ink-2); margin: 0 0 24px; }
.dropzone {
  border: 2px dashed var(--line); border-radius: 20px; background: var(--card);
  padding: 40px 24px; text-align: center; transition: border-color .15s ease, background .15s ease;
}
.dropzone.drag { border-color: var(--green); background: var(--green-l); }
.dropzone .ic { font-size: 44px; }
.dropzone p { color: var(--ink-2); margin: 14px 0 18px; }
.snap-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.preview { margin-top: 22px; text-align: center; }
.preview img { max-width: 100%; max-height: 320px; border-radius: 14px; border: 1px solid var(--line); }
.snap-status { margin-top: 22px; text-align: center; min-height: 24px; color: var(--ink-2); }
.snap-status.err { color: var(--coral-d); font-weight: 600; }
.spinner { display: inline-block; width: 18px; height: 18px; border: 3px solid var(--green-l); border-top-color: var(--green); border-radius: 50%; animation: spin .8s linear infinite; vertical-align: -3px; margin-right: 8px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- quiz / shared pages ---------- */
.tabs { display: inline-flex; gap: 4px; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 4px; margin: 4px 0 20px; box-shadow: var(--shadow); }
.tab { text-decoration: none; color: var(--ink-2); padding: 8px 16px; border-radius: 9px; font-weight: 600; font-size: 15px; }
.tab.active { background: var(--green); color: #fff; }
.quiz-title { font-size: clamp(26px, 5vw, 36px); margin: 6px 0 6px; }
.quiz-meta { color: var(--ink-3); margin: 0 0 22px; font-size: 15px; }
.section-h { margin: 36px 0 14px; font-size: 20px; }

.q-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); margin-bottom: 18px; }
.q-progress { color: var(--ink-3); font-size: 14px; font-weight: 600; margin: 0 0 10px; }
.q-text { font-size: 19px; font-weight: 700; margin: 0 0 16px; }
.opt {
  display: block; width: 100%; text-align: left; background: var(--paper); border: 1.5px solid var(--line);
  border-radius: 12px; padding: 14px 16px; margin-bottom: 10px; font-size: 16px; cursor: pointer;
  font-family: inherit; color: var(--ink); transition: border-color .12s, background .12s;
}
.opt:hover:not([disabled]) { border-color: var(--green); }
.opt.correct { border-color: var(--green); background: var(--green-l); color: var(--green-d); font-weight: 650; }
.opt.wrong { border-color: var(--coral); background: #fdeee9; color: var(--coral-d); font-weight: 650; }
.opt[disabled] { cursor: default; }
.q-next { margin-top: 8px; }

.result-card { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 32px; box-shadow: var(--shadow); text-align: center; }
.result-score { font-size: 60px; font-weight: 850; color: var(--green); margin: 6px 0; }
.result-card p { color: var(--ink-2); margin: 0 0 20px; }

/* flashcards */
.flash-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
@media (max-width: 560px) { .flash-grid { grid-template-columns: 1fr; } }
.flashcard { background: none; border: none; padding: 0; cursor: pointer; perspective: 1000px; min-height: 150px; font-family: inherit; }
.fc-inner { position: relative; display: block; width: 100%; height: 100%; min-height: 150px; transition: transform .5s; transform-style: preserve-3d; }
.flashcard.flipped .fc-inner { transform: rotateY(180deg); }
.fc-front, .fc-back {
  position: absolute; inset: 0; backface-visibility: hidden; border-radius: var(--radius);
  display: grid; place-items: center; padding: 20px; text-align: center; box-shadow: var(--shadow);
  border: 1px solid var(--line);
}
.fc-front { background: var(--card); font-weight: 700; font-size: 18px; }
.fc-back { background: var(--green); color: #fff; transform: rotateY(180deg); font-size: 16px; }

.summary-card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; box-shadow: var(--shadow); font-size: 18px; line-height: 1.6; }

/* dashboard */
.dash-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 18px; }
.dash-head h1 { font-size: 30px; margin: 4px 0; }
.dash-actions { display: flex; gap: 8px; align-items: center; }
.usage { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 16px 18px; box-shadow: var(--shadow); }
.usage-bar { height: 10px; background: var(--green-l); border-radius: 999px; overflow: hidden; }
.usage-bar span { display: block; height: 100%; background: var(--green); border-radius: 999px; }
.usage p { margin: 8px 0 0; color: var(--ink-2); font-size: 14px; }
.usage-unlimited { color: var(--green-d); font-weight: 650; }
.upgrade { margin-top: 22px; background: var(--green); color: #fff; border-radius: 18px; padding: 26px; }
.upgrade h2 { margin: 0 0 6px; }
.upgrade p { margin: 0 0 8px; color: #d8efe8; }
.upgrade .btn { color: var(--ink); }
.upgrade .btn-accent { color: #fff; }
.quiz-list { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.quiz-list a { display: flex; justify-content: space-between; gap: 12px; align-items: center; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; text-decoration: none; box-shadow: var(--shadow); }
.ql-title { font-weight: 650; color: var(--ink); }
.ql-meta { color: var(--ink-3); font-size: 13px; flex: none; }
.empty { color: var(--ink-2); }
.banner { background: var(--green-l); color: var(--green-d); border-radius: 12px; padding: 12px 16px; margin-bottom: 18px; font-weight: 600; }
.banner.warn { background: #fdeee9; color: var(--coral-d); }

/* login */
.auth-card { max-width: 420px; margin: 48px auto 0; background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 32px; box-shadow: var(--shadow); }
.auth-card h1 { font-size: 26px; margin: 0 0 6px; }
.auth-card p.sub { color: var(--ink-2); margin: 0 0 22px; }
.auth-card input[type=email] { width: 100%; padding: 14px 16px; border: 1.5px solid var(--line); border-radius: 12px; font-size: 16px; font-family: inherit; margin-bottom: 12px; }
.auth-card input[type=email]:focus { outline: none; border-color: var(--green); }
.auth-card .btn { width: 100%; }
.auth-msg { margin-top: 16px; font-size: 15px; }
.auth-msg.ok { color: var(--green-d); }
.auth-msg.err { color: var(--coral-d); }
.auth-msg a { word-break: break-all; }

.ns-questions { color: var(--ink-2); }
.confetti { position: fixed; top: -10px; width: 10px; height: 14px; z-index: 50; pointer-events: none; will-change: transform; }