/* Snapmath — mobile-first dark theme, big touch targets, kid-friendly energy. */

:root {
  --bg: #0f1220;
  --bg-2: #1a1e33;
  --surface: #1e2338;
  --surface-2: #2a3050;
  --border: #33395a;

  --ink: #f5f6fb;
  --ink-soft: #b4bad3;
  --muted: #7a83a5;

  --accent: #f26b2c;         /* primary orange — the spark */
  --accent-strong: #ff7e3e;
  --accent-soft: rgba(242,107,44,.18);

  --green: #38d19a;
  --green-soft: rgba(56,209,154,.16);
  --amber: #ffbe3c;
  --amber-soft: rgba(255,190,60,.16);
  --red: #ff5a6a;
  --red-soft: rgba(255,90,106,.16);

  --shadow-lg: 0 10px 30px rgba(0,0,0,.35);
  --shadow-key: 0 2px 0 rgba(0,0,0,.4);

  --safe-top: env(safe-area-inset-top, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

*, *::before, *::after { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--ink);
  font: 16px/1.5 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
  min-height: 100vh;
  min-height: 100dvh;
}
body { padding-top: var(--safe-top); padding-bottom: var(--safe-bottom); }
button { font: inherit; }

/* ============================================================ Views */
.view { min-height: 100vh; min-height: 100dvh; display: flex; flex-direction: column; }
[hidden] { display: none !important; }
.muted { color: var(--muted); }

/* ============================================================ Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .4rem; border: 0; border-radius: 14px; cursor: pointer;
  padding: .9rem 1.4rem; font-weight: 600; font-size: 1rem;
  transition: transform .08s ease, background .12s ease;
  user-select: none; -webkit-tap-highlight-color: transparent;
}
.btn:active { transform: scale(.98); }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 4px 12px rgba(242,107,44,.25); }
.btn-primary:not(:disabled):hover { background: var(--accent-strong); }
.btn-ghost { background: transparent; color: var(--ink-soft); }
.btn-ghost:hover { color: var(--ink); }
.btn-huge {
  width: 100%; padding: 1.15rem 1.4rem;
  font-size: 1.1rem; border-radius: 16px; letter-spacing: .01em;
}

/* ============================================================ Landing */
.landing-inner {
  flex: 1; display: flex; flex-direction: column;
  padding: 2.2rem 1.4rem 1.6rem; gap: 1.2rem;
  max-width: 520px; margin: 0 auto; width: 100%;
}
.brand-mark {
  display: inline-flex; align-items: baseline; gap: .1rem;
  font-family: Georgia, "Iowan Old Style", serif;
  font-size: 1.5rem; font-weight: 700; letter-spacing: -.01em;
}
.brand-s {
  background: var(--accent); color: #fff;
  width: 1.8rem; height: 1.8rem;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 8px; margin-right: .3rem;
  font-size: 1.3rem; box-shadow: 0 2px 8px rgba(242,107,44,.4);
}
.brand-word { color: var(--ink); }
.landing-headline {
  font-family: Georgia, serif; font-weight: 700; font-size: 2.6rem;
  line-height: 1.05; margin: .4rem 0 0; letter-spacing: -.02em;
}
.landing-lede { color: var(--ink-soft); font-size: 1.1rem; margin: 0 0 .4rem; }

.runner-picker { margin-top: .6rem; }
.runner-picker-label {
  font-size: .78rem; text-transform: uppercase; letter-spacing: .1em;
  color: var(--muted); font-weight: 700; margin-bottom: .6rem;
}
.runner-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: .6rem; }
.runner-tile {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: 14px; padding: 1rem .5rem;
  display: flex; flex-direction: column; align-items: center; gap: .3rem;
  color: var(--ink); cursor: pointer;
  transition: background .12s, border-color .12s, transform .08s;
  -webkit-tap-highlight-color: transparent;
}
.runner-tile:active { transform: scale(.96); }
.runner-tile.selected {
  background: var(--accent-soft); border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(242,107,44,.15);
}
.runner-emoji { font-size: 1.8rem; line-height: 1; }
.runner-name { font-weight: 600; font-size: .95rem; }
.runner-badge {
  font-size: .68rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--muted); font-weight: 600;
}

.landing-footnote { margin-top: 1rem; font-size: .9rem; text-align: center; }

/* ============================================================ Drill */
.drill-header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 1rem 1.2rem .8rem;
  border-bottom: 1px solid var(--border);
}
.drill-header-left { display: flex; align-items: center; gap: .6rem; }
.drill-runner-chip {
  font-size: .8rem; padding: .25rem .6rem; border-radius: 99px;
  background: var(--surface-2); color: var(--ink-soft); font-weight: 600;
}
.drill-progress { color: var(--muted); font-size: .85rem; font-variant-numeric: tabular-nums; }
.drill-timer {
  font-family: Georgia, serif; font-variant-numeric: tabular-nums;
  font-size: 1.8rem; font-weight: 700; letter-spacing: -.02em;
  display: flex; align-items: baseline; gap: .1rem;
  transition: color .3s;
}
.drill-timer .drill-timer-unit { font-size: .9rem; color: var(--muted); font-weight: 400; }
.drill-timer[data-state="fresh"] { color: var(--ink); }
.drill-timer[data-state="fast"] { color: var(--green); }
.drill-timer[data-state="on_time"] { color: var(--amber); }
.drill-timer[data-state="slow"] { color: var(--red); }
.drill-timer[data-state="over"] {
  color: var(--red);
  animation: timer-pulse 1.4s ease-in-out infinite;
}
@keyframes timer-pulse { 0%,100% { opacity: 1 } 50% { opacity: .55 } }

.drill-main {
  flex: 1; display: flex; flex-direction: column;
  padding: 1.2rem 1.2rem 1rem; gap: 1rem;
  max-width: 520px; margin: 0 auto; width: 100%;
}
.drill-topic {
  font-size: .72rem; text-transform: uppercase; letter-spacing: .1em;
  color: var(--accent); font-weight: 700;
}
.drill-stem {
  font-family: Georgia, serif; font-size: 1.6rem; line-height: 1.35;
  color: var(--ink); margin: 0; letter-spacing: -.01em;
  min-height: 4rem;
}
.drill-stem code {
  background: var(--surface-2); padding: .05rem .35rem; border-radius: 6px;
  font-family: "SF Mono", Consolas, monospace; font-size: .92em;
}

.drill-input-area {
  margin-top: auto;
  display: flex; flex-direction: column; gap: .8rem;
}
.drill-answer {
  background: var(--surface); border: 1.5px solid var(--border);
  border-radius: 14px; padding: 1rem 1.2rem;
  font-family: Georgia, serif; font-size: 2rem; font-weight: 700;
  min-height: 3.6rem; display: flex; align-items: center; justify-content: flex-end;
  letter-spacing: -.02em; font-variant-numeric: tabular-nums;
  transition: border-color .12s;
}
.drill-answer:has(.drill-answer-placeholder) { border-color: var(--border); }
.drill-answer:not(:has(.drill-answer-placeholder)) { border-color: var(--accent); background: var(--accent-soft); }
.drill-answer-placeholder {
  color: var(--muted); font-family: -apple-system, sans-serif;
  font-size: 1rem; font-weight: 500;
}

/* Keypad grid — 4 rows × 3 cols, submit spans 2 rows on the right */
.drill-keypad {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-template-rows: repeat(4, minmax(56px, 1fr));
  gap: .5rem;
}
.key {
  background: var(--surface); color: var(--ink);
  border: 1px solid var(--border); border-radius: 12px;
  font-size: 1.5rem; font-weight: 600;
  padding: 0; cursor: pointer;
  -webkit-tap-highlight-color: transparent; user-select: none;
  transition: transform .06s, background .12s;
  box-shadow: var(--shadow-key);
}
.key:active { transform: translateY(1px); box-shadow: 0 1px 0 rgba(0,0,0,.4); }
.key:hover { background: var(--surface-2); }
.key.key-alt { color: var(--ink-soft); font-size: 1.3rem; }
.key.key-clear { color: var(--red); font-size: 1.5rem; }
.key.key-submit {
  grid-column: 4; grid-row: 3 / span 2;
  background: var(--accent); color: #fff;
  font-size: 1.4rem; letter-spacing: .01em;
  box-shadow: 0 4px 0 rgba(0,0,0,.5), 0 6px 14px rgba(242,107,44,.35);
}
.key.key-submit:hover { background: var(--accent-strong); }
.key.key-submit:disabled { background: var(--surface-2); color: var(--muted); box-shadow: var(--shadow-key); }
.key[data-k="7"] { grid-row: 1; }
.key[data-k="8"] { grid-row: 1; }
.key[data-k="9"] { grid-row: 1; }
.key[data-k="4"] { grid-row: 2; }
.key[data-k="5"] { grid-row: 2; }
.key[data-k="6"] { grid-row: 2; }
.key[data-k="1"] { grid-row: 3; }
.key[data-k="2"] { grid-row: 3; }
.key[data-k="3"] { grid-row: 3; }
.key[data-k="-"] { grid-column: 4; grid-row: 1; }
.key[data-k="."] { grid-column: 4; grid-row: 2; }
.key[data-k="0"] { grid-column: 1 / span 2; grid-row: 4; }
.key[data-k="clr"] { grid-column: 3; grid-row: 4; }

/* ============================================================ Verdict overlay */
.verdict-overlay {
  position: fixed; inset: 0; background: rgba(15,18,32,.94);
  z-index: 50; display: flex; align-items: flex-end;
  padding: 1rem; padding-bottom: max(1rem, var(--safe-bottom));
  animation: verdict-fade .2s ease-out;
}
@keyframes verdict-fade { from { opacity: 0 } to { opacity: 1 } }
.verdict-card {
  background: var(--surface); border-radius: 20px; padding: 1.6rem 1.4rem 1.2rem;
  width: 100%; max-width: 520px; margin: 0 auto;
  box-shadow: var(--shadow-lg); border: 1px solid var(--border);
  display: flex; flex-direction: column; gap: .5rem;
  animation: verdict-slide .28s cubic-bezier(.2,.9,.3,1);
}
@keyframes verdict-slide { from { transform: translateY(30px); opacity: 0 } to { transform: translateY(0); opacity: 1 } }
.verdict-mark {
  font-size: 3rem; line-height: 1; text-align: center; margin-bottom: .3rem;
}
.verdict-mark.correct { color: var(--green); }
.verdict-mark.wrong { color: var(--red); }
.verdict-headline {
  font-family: Georgia, serif; font-size: 1.5rem; font-weight: 700;
  text-align: center; line-height: 1.25; letter-spacing: -.01em;
}
.verdict-headline.great { color: var(--green); }
.verdict-headline.okay { color: var(--amber); }
.verdict-headline.slow { color: var(--red); }
.verdict-time {
  text-align: center; font-family: Georgia, serif; font-variant-numeric: tabular-nums;
  font-size: 1.15rem; color: var(--ink-soft); font-weight: 500;
}
.verdict-answer {
  text-align: center; font-size: .95rem; color: var(--red);
  padding: .5rem; margin-top: .3rem;
  background: var(--red-soft); border-radius: 10px;
}
.verdict-faster {
  background: var(--surface-2); border-radius: 12px; padding: .9rem 1.1rem;
  color: var(--ink-soft); font-size: .95rem; line-height: 1.5;
  margin-top: .4rem;
  border-left: 3px solid var(--accent);
}
.verdict-faster::before {
  content: "Faster way";
  display: block; text-transform: uppercase; letter-spacing: .08em;
  font-size: .7rem; font-weight: 700; color: var(--accent);
  margin-bottom: .3rem;
}
.verdict-card .btn-huge { margin-top: .8rem; }

/* ============================================================ Summary */
.summary-inner {
  flex: 1; padding: 1.6rem 1.2rem 1.6rem;
  max-width: 520px; margin: 0 auto; width: 100%;
  display: flex; flex-direction: column; gap: 1.2rem;
}
.summary-badge {
  font-size: 4.5rem; text-align: center; line-height: 1;
  margin-top: .6rem;
}
.summary-headline {
  font-family: Georgia, serif; font-weight: 700; font-size: 2rem;
  text-align: center; margin: 0; letter-spacing: -.01em;
}
.summary-stats {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: .5rem;
}
.summary-stat {
  background: var(--surface); border-radius: 14px; padding: 1rem .5rem;
  text-align: center; border: 1px solid var(--border);
}
.summary-stat-value {
  font-family: Georgia, serif; font-size: 1.6rem; font-weight: 700;
  color: var(--accent); line-height: 1; letter-spacing: -.02em;
  font-variant-numeric: tabular-nums;
}
.summary-stat-label {
  font-size: .72rem; text-transform: uppercase; letter-spacing: .08em;
  color: var(--muted); font-weight: 600; margin-top: .35rem;
}

.summary-block {
  background: var(--surface); border-radius: 14px; padding: 1rem 1.2rem;
  border: 1px solid var(--border);
}
.summary-block-label {
  font-size: .72rem; text-transform: uppercase; letter-spacing: .1em;
  color: var(--muted); font-weight: 700; margin-bottom: .7rem;
}
.summary-percentile-bar {
  height: 14px; background: var(--surface-2); border-radius: 99px;
  position: relative; overflow: hidden; margin-bottom: .6rem;
}
.summary-percentile-fill {
  height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-strong));
  border-radius: 99px; transition: width .8s ease-out;
}
.summary-percentile-text { text-align: center; font-size: .95rem; color: var(--ink-soft); }
.summary-topics { display: flex; flex-direction: column; gap: .5rem; }
.topic-row {
  display: grid; grid-template-columns: 1fr auto auto; gap: .5rem;
  align-items: center; font-size: .92rem;
}
.topic-row .topic-name { color: var(--ink); }
.topic-row .topic-count { color: var(--muted); font-variant-numeric: tabular-nums; font-size: .82rem; }
.topic-row .topic-verdict { font-size: 1.1rem; }

.summary-focus-list { display: flex; flex-direction: column; gap: .5rem; }
.focus-row {
  background: var(--surface-2); border-radius: 10px; padding: .8rem 1rem;
  font-size: .9rem; color: var(--ink-soft); line-height: 1.45;
  border-left: 3px solid var(--amber);
}
.focus-row strong { color: var(--ink); }

.summary-actions {
  display: flex; flex-direction: column; gap: .6rem; margin-top: .6rem;
}

/* ============================================================ Larger screens */
@media (min-width: 720px) {
  .landing-headline { font-size: 3.4rem; }
  .drill-stem { font-size: 1.9rem; }
  .drill-keypad { max-width: 480px; margin: 0 auto; }
}