/* Family Math Fluency
 * ---------------------------------------------------------------------------
 * One stylesheet, no framework, no external fonts. Mobile-first from 320px.
 *
 * Design intent: this is opened on a cracked Android phone at 8pm by a tired
 * family. It should look calm and certain, not gamified and loud. Big type,
 * generous targets, one accent colour doing one job, and no motion unless the
 * device says motion is welcome.
 */

:root {
  /* Ink on paper, warmed slightly so it does not read as a form to fill in. */
  --paper: #fdfbf7;
  --card: #ffffff;
  --ink: #1b1b1f;
  --ink-soft: #55535e;
  --line: #ddd8cf;

  /* One accent, deep enough for white text at AA (7.4:1 on white). */
  --accent: #1f5f4b;
  --accent-soft: #e3f0ea;
  --accent-ink: #12362b;

  /* Feedback. Both pass AA against --card and never appear without a word
     beside them -- colour alone is not a message. */
  --yes: #1a6b3c;
  --yes-soft: #e2f4e8;
  --no: #a3341f;
  --no-soft: #fbeae6;

  --gold: #8a6212;
  --gold-soft: #fbf1d8;

  --radius: 14px;
  --tap: 48px; /* never smaller, anywhere */
  --gap: 16px;
  --shadow: 0 1px 2px rgba(27, 27, 31, 0.07), 0 4px 14px rgba(27, 27, 31, 0.05);

  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial,
    sans-serif;
  /* Digits must not wander in width while a child types an answer. */
  --font-num: ui-monospace, "SF Mono", "Roboto Mono", Menlo, Consolas, monospace;

  --speed: 180ms;
}

/* The manual toggle and the OS setting both land here, so animation is
   controlled in exactly one place. */
:root[data-motion="reduced"] {
  --speed: 0ms;
}

@media (prefers-reduced-motion: reduce) {
  :root {
    --speed: 0ms;
  }
}

:root[data-motion="reduced"] *,
:root[data-motion="reduced"] *::before,
:root[data-motion="reduced"] *::after {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--paper);
  /* Respect the notch without letting content hug the edge. */
  padding: env(safe-area-inset-top) env(safe-area-inset-right)
    env(safe-area-inset-bottom) env(safe-area-inset-left);
  -webkit-tap-highlight-color: transparent;
}

h1,
h2,
h3 {
  line-height: 1.2;
  margin: 0 0 0.4em;
  letter-spacing: -0.01em;
}
h1 {
  font-size: 1.5rem;
}
h2 {
  font-size: 1.25rem;
}
h3 {
  font-size: 1.05rem;
}
p {
  margin: 0 0 var(--gap);
}

/* --- focus -------------------------------------------------------------- */
/* Visible on every focusable thing. Keyboard users are not a special case. */
:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--accent);
  color: #fff;
  padding: 12px 16px;
  z-index: 100;
}
.skip-link:focus {
  left: 0;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* --- layout ------------------------------------------------------------- */

.shell {
  max-width: 560px;
  margin: 0 auto;
  padding: var(--gap);
  /* Room for the keypad on short screens. */
  padding-bottom: 32px;
}

.topbar {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: var(--tap);
  margin-bottom: 8px;
}
.topbar h1 {
  font-size: 1.15rem;
  margin: 0;
  flex: 1;
  min-width: 0;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: var(--gap);
  margin-bottom: var(--gap);
  box-shadow: var(--shadow);
}

.muted {
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

/* --- buttons ------------------------------------------------------------ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: var(--tap);
  min-width: var(--tap);
  padding: 12px 18px;
  font: inherit;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  border: 2px solid var(--accent);
  border-radius: var(--radius);
  cursor: pointer;
  transition: transform var(--speed) ease, background var(--speed) ease;
  text-decoration: none;
  text-align: center;
}
.btn:active {
  transform: scale(0.98);
}
.btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
}
.btn--ghost {
  color: var(--accent-ink);
  background: transparent;
  border-color: var(--line);
}
.btn--soft {
  color: var(--accent-ink);
  background: var(--accent-soft);
  border-color: var(--accent-soft);
}
.btn--block {
  width: 100%;
}
.btn--small {
  padding: 8px 12px;
  font-size: 0.9rem;
  /* Still a full-size tap target, just visually lighter. */
  min-height: var(--tap);
}

/* --- forms -------------------------------------------------------------- */

label {
  display: block;
  font-weight: 600;
  margin-bottom: 4px;
}
.field {
  margin-bottom: var(--gap);
}
.field .muted {
  margin: 4px 0 0;
}

input[type="text"],
input[type="number"],
input[type="url"],
select,
textarea {
  width: 100%;
  min-height: var(--tap);
  padding: 12px;
  font: inherit;
  color: var(--ink);
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 10px;
}
input:focus,
select:focus,
textarea:focus {
  border-color: var(--accent);
}
textarea {
  min-height: 110px;
  resize: vertical;
  font-family: var(--font-num);
  font-size: 0.95rem;
}

/* --- profile picker ----------------------------------------------------- */

.profiles {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: var(--gap);
  list-style: none;
  padding: 0;
  margin: 0 0 var(--gap);
}
@media (max-width: 359px) {
  .profiles {
    grid-template-columns: 1fr;
  }
}

.profile {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 132px;
  padding: var(--gap) 8px;
  font: inherit;
  color: var(--ink);
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}
.profile:hover {
  border-color: var(--accent);
}
.profile__avatar {
  font-size: 2.5rem;
  line-height: 1;
}
.profile__name {
  font-weight: 700;
  word-break: break-word;
}

.avatar-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  gap: 8px;
  margin: 0 0 var(--gap);
  padding: 0;
  border: 0;
}
.avatar-grid button {
  min-height: 56px;
  font-size: 1.7rem;
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 10px;
  cursor: pointer;
}
.avatar-grid button[aria-pressed="true"] {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* --- level map ---------------------------------------------------------- */

.levels {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 10px;
}

.level {
  display: grid;
  grid-template-columns: 52px 1fr auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 72px;
  padding: 12px;
  font: inherit;
  text-align: left;
  color: var(--ink);
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}
.level[aria-current="step"] {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}
.level[data-state="locked"] {
  opacity: 0.6;
  cursor: not-allowed;
}
.level__num {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-ink);
  background: var(--accent-soft);
  border-radius: 50%;
}
.level[data-state="done"] .level__num {
  color: var(--gold);
  background: var(--gold-soft);
}
.level__title {
  font-weight: 700;
}
.level__sub {
  font-size: 0.88rem;
  color: var(--ink-soft);
}
.level__badge {
  font-size: 1.5rem;
}

/* --- week view ---------------------------------------------------------- */

.strategy {
  padding: 12px var(--gap);
  background: var(--accent-soft);
  border-radius: var(--radius);
  margin-bottom: var(--gap);
}
.strategy__label {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-ink);
}
.strategy__text {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 2px 0 0;
}

.activities {
  display: grid;
  gap: 10px;
  padding: 0;
  margin: 0 0 var(--gap);
  list-style: none;
}
.activity {
  display: grid;
  grid-template-columns: 44px 1fr auto;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 68px;
  padding: 12px;
  font: inherit;
  text-align: left;
  color: var(--ink);
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
}
.activity__icon {
  font-size: 1.6rem;
}
.activity__name {
  font-weight: 700;
}
.activity__sub {
  font-size: 0.86rem;
  color: var(--ink-soft);
}
.activity[disabled] {
  opacity: 0.55;
}
.activity__tick {
  color: var(--yes);
  font-size: 1.2rem;
}

/* Five-day goal strip. */
.days {
  display: flex;
  gap: 6px;
  list-style: none;
  padding: 0;
  margin: 0 0 8px;
}
.days li {
  flex: 1;
  min-width: 0;
  text-align: center;
  padding: 8px 2px;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--ink-soft);
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 8px;
}
.days li[data-done="true"] {
  color: var(--accent-ink);
  background: var(--accent-soft);
  border-color: var(--accent);
}

/* --- question ----------------------------------------------------------- */

.qbar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}
.qbar__track {
  flex: 1;
  height: 8px;
  background: var(--line);
  border-radius: 99px;
  overflow: hidden;
}
.qbar__fill {
  height: 100%;
  background: var(--accent);
  border-radius: 99px;
  transition: width var(--speed) ease;
}

.prompt {
  font-family: var(--font-num);
  font-size: clamp(2.1rem, 13vw, 3rem);
  font-weight: 700;
  text-align: center;
  letter-spacing: 0.02em;
  margin: 18px 0;
}

.answer {
  width: 100%;
  min-height: 64px;
  padding: 10px;
  font-family: var(--font-num);
  font-size: 2rem;
  font-weight: 700;
  text-align: center;
  color: var(--ink);
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 12px;
}
.answer[data-state="yes"] {
  border-color: var(--yes);
  background: var(--yes-soft);
}
.answer[data-state="no"] {
  border-color: var(--no);
  background: var(--no-soft);
}

.feedback {
  min-height: 28px;
  margin: 8px 0;
  font-weight: 700;
  text-align: center;
}
.feedback[data-state="yes"] {
  color: var(--yes);
}
.feedback[data-state="no"] {
  color: var(--no);
}

/* --- keypad ------------------------------------------------------------- */
/* A custom keypad, not the OS one: Android keyboards cover the question, and
   a fixed grid means the 7 is always in the same place. */

.keypad {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: var(--gap);
}
.keypad button {
  min-height: 58px;
  font-family: var(--font-num);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--ink);
  background: var(--card);
  border: 2px solid var(--line);
  border-radius: 12px;
  cursor: pointer;
}
.keypad button:active {
  background: var(--accent-soft);
}
.keypad button[data-key="check"] {
  color: #fff;
  background: var(--accent);
  border-color: var(--accent);
  font-size: 1.05rem;
}
.keypad button[data-key="del"],
.keypad button[data-key="clear"] {
  font-size: 1.05rem;
  color: var(--ink-soft);
}

/* --- hints -------------------------------------------------------------- */

.hints {
  margin-top: var(--gap);
}
.hint {
  padding: 12px;
  margin-bottom: 8px;
  background: var(--accent-soft);
  border-left: 4px solid var(--accent);
  border-radius: 0 10px 10px 0;
}
.hint__label {
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--accent-ink);
}

/* --- procedure workspace ------------------------------------------------ */

.work {
  font-family: var(--font-num);
  overflow-x: auto;
}
.work__frame {
  display: inline-block;
  min-width: 100%;
  padding: 12px 4px;
}
.work__line {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.work__line:last-child {
  border-bottom: 0;
}
.work__line[data-state="done"] {
  color: var(--ink-soft);
}
.work__line[data-state="active"] {
  font-weight: 700;
}
.work__q {
  flex: 1 1 180px;
  min-width: 0;
  font-family: var(--font);
}
.work__in {
  width: 92px;
  min-height: var(--tap);
  padding: 8px;
  font-family: var(--font-num);
  font-size: 1.2rem;
  font-weight: 700;
  text-align: center;
  border: 2px solid var(--line);
  border-radius: 10px;
}
.work__in[data-state="yes"] {
  border-color: var(--yes);
  background: var(--yes-soft);
}
.work__in[data-state="no"] {
  border-color: var(--no);
  background: var(--no-soft);
}

/* The long-division bracket, drawn with borders rather than an image. */
.bracket {
  display: inline-flex;
  align-items: stretch;
  font-size: 1.6rem;
  font-weight: 700;
  margin: 8px 0 16px;
}
.bracket__divisor {
  padding: 6px 10px 6px 0;
}
.bracket__dividend {
  padding: 6px 10px;
  border-top: 3px solid var(--ink);
  border-left: 3px solid var(--ink);
  border-top-left-radius: 10px;
}

/* --- results and badges ------------------------------------------------- */

.result {
  text-align: center;
}
.result__figure {
  font-family: var(--font-num);
  font-size: 3rem;
  font-weight: 700;
  color: var(--accent);
}
.badge {
  display: inline-grid;
  place-items: center;
  width: 108px;
  height: 108px;
  margin: 8px auto var(--gap);
  font-size: 3rem;
  color: var(--gold);
  background: var(--gold-soft);
  border: 3px solid var(--gold);
  border-radius: 50%;
}
.badge--pop {
  animation: pop var(--speed) ease-out;
}
@keyframes pop {
  from {
    transform: scale(0.8);
  }
  to {
    transform: scale(1);
  }
}

.code {
  font-family: var(--font-num);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  word-break: break-all;
  text-align: center;
  padding: 12px;
  background: var(--accent-soft);
  border-radius: 10px;
}

/* --- tables (teacher view) ---------------------------------------------- */

.table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
th,
td {
  padding: 10px 8px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}
th {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}
td[data-flag="low"] {
  color: var(--no);
  font-weight: 700;
}
td[data-flag="good"] {
  color: var(--yes);
  font-weight: 700;
}

/* --- family view -------------------------------------------------------- */

.lang-toggle {
  display: inline-flex;
  border: 2px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}
.lang-toggle button {
  min-height: var(--tap);
  min-width: 56px;
  padding: 0 14px;
  font: inherit;
  font-weight: 600;
  color: var(--ink);
  background: var(--card);
  border: 0;
  cursor: pointer;
}
.lang-toggle button[aria-pressed="true"] {
  color: #fff;
  background: var(--accent);
}

.say-list {
  padding-left: 1.1em;
  margin: 0 0 var(--gap);
}
.say-list li {
  margin-bottom: 8px;
}

.callout {
  padding: 12px var(--gap);
  background: var(--gold-soft);
  border-left: 4px solid var(--gold);
  border-radius: 0 10px 10px 0;
  margin-bottom: var(--gap);
}

/* --- print -------------------------------------------------------------- */
/* The family card and the flyer are meant to go on a fridge. */

@media print {
  :root {
    --shadow: none;
  }
  body {
    background: #fff;
    font-size: 12pt;
  }
  .no-print,
  .topbar,
  .btn,
  .lang-toggle,
  .keypad {
    display: none !important;
  }
  .card {
    break-inside: avoid;
    border: 1px solid #999;
    box-shadow: none;
  }
  .shell {
    max-width: none;
    padding: 0;
  }
  a[href]::after {
    content: "";
  }
}

/* --- dark mode ---------------------------------------------------------- */
/* Android's system dark mode is common on shared phones. Contrast is checked
   against the dark surfaces, not inherited from the light theme. */

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #14161a;
    --card: #1d2026;
    --ink: #f2f0ec;
    --ink-soft: #b3b0ae;
    --line: #363a42;

    --accent: #6fd3ae;
    --accent-soft: #1d3a31;
    --accent-ink: #b9ecd8;

    --yes: #6ede9d;
    --yes-soft: #163524;
    --no: #ff9c85;
    --no-soft: #3a1d17;

    --gold: #e8c46a;
    --gold-soft: #3a2f16;

    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
  }
  /* On dark, the accent is light, so button text must flip to dark ink. */
  :root:not([data-theme="light"]) .btn,
  :root:not([data-theme="light"]) .keypad button[data-key="check"],
  :root:not([data-theme="light"]) .lang-toggle button[aria-pressed="true"],
  :root:not([data-theme="light"]) .skip-link {
    color: #10201a;
  }
}

/* Used by the Monday explainer's dot grids. */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: scale(0.6);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}