/* ============================================================================
   學 Now — Editorial Ink
   Design system: dark-mode editorial, Playfair Display + DM Mono + Noto Sans SC.
   ============================================================================ */

/* ── Reset ────────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
button, input, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* ── Tokens ───────────────────────────────────────────────────────────────── */
:root {
  /* Surface */
  --bg:          #13110e;
  --bg-raised:   #1c1916;

  /* Ink (warm cream on charcoal) */
  --ink:         #f4ecdb;
  --ink-dim:     rgba(244, 236, 219, .62);
  --ink-faint:   rgba(244, 236, 219, .32);

  /* Dividers */
  --line:        rgba(244, 236, 219, .10);
  --line-strong: rgba(244, 236, 219, .22);

  /* Accents */
  --jade:        #7fb389;
  --jade-dim:    rgba(127, 179, 137, .18);
  --ember:       #d6845a;
  --amber:       #c9a84c;
  --amber-dim:   rgba(201, 168, 76, .18);

  /* Type */
  --font-display: "Playfair Display", Georgia, "Times New Roman", serif;
  --font-mono:    "DM Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --font-hanzi:   "Noto Sans SC", "PingFang SC", "Hiragino Sans GB",
                  "Microsoft YaHei", system-ui, sans-serif;
  --font-body:    "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
                  Helvetica, Arial, sans-serif;

  /* Layout */
  --page-max:     1440px;
  --pad-x:        56px;
  --pad-x-mobile: 18px;
}

/* ── Base ─────────────────────────────────────────────────────────────────── */
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  overflow-x: hidden;
}

.ghost-char {
  position: fixed;
  pointer-events: none;
  user-select: none;
  z-index: 0;
  font-family: var(--font-hanzi);
  font-weight: 300;
  line-height: .85;
  color: transparent;
  -webkit-text-stroke: 1px var(--line-strong);
  right: -180px;
  top: -160px;
  font-size: 920px;
}

.bg-wash {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background: radial-gradient(circle at 20% 80%,
              rgba(127, 179, 137, .04), transparent 50%);
}

/* ── Page shell ───────────────────────────────────────────────────────────── */
.page {
  position: relative;
  z-index: 1;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 36px var(--pad-x) 56px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ── Topbar ───────────────────────────────────────────────────────────────── */
.topbar {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--line);
  gap: 24px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.brand__char {
  font-family: var(--font-hanzi);
  font-size: 32px;
  font-weight: 500;
  letter-spacing: -0.5px;
  line-height: 1;
}
.brand__name {
  font-family: var(--font-display);
  font-size: 24px;
  font-style: italic;
  font-weight: 500;
  letter-spacing: -0.3px;
}
.brand__meta {
  margin-left: 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.topbar__user {
  display: flex;
  align-items: center;
  gap: 18px;
}
.topbar__greet {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--ink-dim);
}
.avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background-size: cover;
  background-position: center;
  background-color: var(--bg-raised);
  flex-shrink: 0;
}

/* ── Eyebrow + display type ───────────────────────────────────────────────── */
.eyebrow {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink-faint);
}

.display {
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 500;
  font-style: italic;
  line-height: 1.05;
  letter-spacing: -1px;
  margin: 0;
}
.display em { font-style: normal; }
.display .hanzi {
  font-family: var(--font-hanzi);
  font-style: normal;
}

.section-title {
  font-family: var(--font-display);
  font-size: 22px;
  font-style: italic;
  font-weight: 500;
  margin: 0;
}

/* ── Buttons ──────────────────────────────────────────────────────────────── */
.btn-ghost,
.btn-primary,
.btn-save {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 9px 18px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink);
  transition: background .15s, color .15s, border-color .15s;
  border-radius: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
}
.btn-ghost:hover {
  background: var(--bg-raised);
  border-color: var(--ink-dim);
}
.btn-primary {
  background: var(--jade);
  border-color: var(--jade);
  color: var(--bg);
}
.btn-primary:hover { filter: brightness(1.05); }

.btn-save { padding: 8px 18px; }
.btn-save:hover { border-color: var(--ink-dim); }
.btn-save[data-state="saved"] {
  background: var(--jade);
  border-color: var(--jade);
  color: var(--bg);
}

/* Compat aliases used in inline error states */
.btn, .btn-outline {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 9px 18px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink);
  transition: background .15s;
  border-radius: 0;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
}
.btn:hover, .btn-outline:hover { background: var(--bg-raised); }

/* ── Lede (dashboard hero) ────────────────────────────────────────────────── */
.lede {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  padding: 28px 0 32px;
}
.lede__head { display: flex; flex-direction: column; gap: 10px; }

/* ── Exercises ────────────────────────────────────────────────────────────── */
.exercises {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.exercise-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 22px 18px;
  background: var(--bg-raised);
  border: 1px solid var(--line-strong);
  transition: border-color .15s, transform .15s;
}
.exercise-card:hover {
  border-color: var(--ink-dim);
  transform: translateY(-1px);
}
.exercise-card__head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}
.exercise-card__kicker {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.8px;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.exercise-card__stat {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: 42px;
  line-height: 1;
  color: var(--jade);
}
.exercise-card--ember .exercise-card__stat { color: var(--ember); }
.exercise-card__title {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 500;
  line-height: 1.1;
}
.exercise-card__blurb {
  margin: 0;
  font-size: 12px;
  color: var(--ink-dim);
  line-height: 1.45;
}
.exercise-card__foot {
  margin-top: 10px;
  padding-top: 10px;
  border-top: 1px dashed var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.2px;
  text-transform: uppercase;
}
.exercise-card__count { color: var(--ink-faint); }
.exercise-card__cta { color: var(--jade); }
.exercise-card--ember .exercise-card__cta { color: var(--ember); }

/* ── Vocabulary ───────────────────────────────────────────────────────────── */
.vocab {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.vocab__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 20px;
  gap: 16px;
  flex-wrap: wrap;
}
.vocab__heading {
  display: flex;
  align-items: baseline;
  gap: 16px;
  flex-wrap: wrap;
}
.vocab__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1px;
  color: var(--ink-faint);
}
.vocab__count { color: var(--jade); }
.vocab__count--learning { color: var(--amber); }
.vocab__count--learned  { color: var(--jade); }

.vocab-grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.vocab-card {
  position: relative;
  cursor: pointer;
  background: var(--bg);
  padding: 18px 12px 14px;
  text-align: center;
  transition: background .15s;
  min-height: 132px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 6px;
}
.vocab-card:hover { background: var(--bg-raised); }

.vocab-card[data-state="learning"]::after,
.vocab-card[data-state="learned"]::after {
  content: "";
  position: absolute;
  top: 6px;
  right: 6px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
}
.vocab-card[data-state="learning"] {
  background: #342c19;
}
.vocab-card[data-state="learning"]::after {
  background: var(--amber);
}
.vocab-card[data-state="learned"] {
  background: #1f2e22;
}
.vocab-card[data-state="learned"]::after {
  background: var(--jade);
}

.vocab-card__pinyin {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1px;
  color: var(--ink-faint);
  min-height: 12px;
}
.vocab-card__hanzi {
  font-family: var(--font-hanzi);
  font-size: 46px;
  font-weight: 400;
  line-height: 1.05;
  color: var(--ink);
  cursor: pointer;
  transition: transform .25s, color .15s, text-shadow .15s;
  margin: 0;
}
.vocab-card__hanzi[data-speaking="true"] {
  transform: scale(1.08);
  text-shadow: 0 0 24px var(--amber);
}
.vocab-card[data-state="learned"] .vocab-card__hanzi[data-speaking="true"] {
  text-shadow: 0 0 24px var(--jade);
}
.vocab-card__english {
  font-size: 10px;
  color: var(--ink-dim);
  line-height: 1.2;
}

/* ── Settings page ────────────────────────────────────────────────────────── */
.settings-lede {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 64px;
  padding: 36px 0 24px;
}
.settings-display {
  font-family: var(--font-display);
  font-size: 54px;
  font-style: italic;
  font-weight: 500;
  line-height: 1;
  letter-spacing: -1.5px;
  margin: 6px 0 0;
}
.settings-prose {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-dim);
  max-width: 320px;
}

.settings-form {
  display: flex;
  flex-direction: column;
  gap: 22px;
  padding-top: 8px;
  border: 0;
  margin: 0;
  min-width: 0;
}
.field-group {
  border: 0;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.field-group__legend {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink-faint);
  padding: 0 0 8px;
  border-bottom: 1px solid var(--line);
  width: 100%;
  margin-bottom: 8px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.field__label {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.field__input {
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink);
  padding: 6px 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-style: italic;
  outline: none;
  transition: border-color .15s;
  border-radius: 0;
}
.field__input:focus { border-color: var(--jade); }
.field--mono .field__input {
  font-family: var(--font-mono);
  font-size: 13px;
  font-style: normal;
}
.field__select {
  -webkit-appearance: none;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' viewBox='0 0 10 6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='rgba(244,236,219,.32)'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 2px center;
  padding-right: 20px;
  cursor: pointer;
}
.field__select:focus { border-color: var(--jade); }
.field__select option {
  background: #1c1916;
  color: #f4ecdb;
  font-family: "DM Mono", monospace;
  font-style: normal;
  font-size: 13px;
}

/* Avatar upload (settings) */
.avatar-upload {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 6px 0;
}
.avatar-upload__preview {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  background-color: var(--bg-raised);
  background-size: cover;
  background-position: center;
  cursor: pointer;
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
}
.avatar-upload__preview img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 50%;
  display: block;
}
.avatar-upload__overlay {
  position: absolute;
  inset: 0;
  background: rgba(19, 17, 14, .72);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--ink);
  opacity: 0;
  transition: opacity .15s;
  border-radius: 50%;
}
.avatar-upload__preview:hover .avatar-upload__overlay { opacity: 1; }
.avatar-upload__actions {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.avatar-upload__actions .btn-ghost { padding: 7px 14px; }

/* Slider field */
.slider-field {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.slider-field__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}
.slider-field__value {
  font-family: var(--font-display);
  font-size: 18px;
  font-style: italic;
  color: var(--jade);
}
.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 2px;
  background: var(--line);
  border-radius: 0;
  outline: none;
  cursor: pointer;
  margin: 0;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--jade);
  border: 0;
  cursor: pointer;
}
.slider::-moz-range-thumb {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--jade);
  border: 0;
  cursor: pointer;
}
.slider::-moz-range-track { background: var(--line); height: 2px; border: 0; }

/* Settings footer */
.settings-foot {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 0 0;
  border-top: 1px solid var(--line);
  gap: 16px;
  flex-wrap: wrap;
}
.settings-foot__note {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1.5px;
  color: var(--ink-faint);
  text-transform: uppercase;
}
.settings-foot__actions {
  display: flex;
  gap: 10px;
}

/* ── Toast ────────────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translate(-50%, 60px);
  background: var(--bg-raised);
  border: 1px solid var(--jade);
  color: var(--ink);
  padding: 12px 22px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  z-index: 50;
  transition: transform .25s cubic-bezier(.2,.7,.3,1), opacity .25s;
  opacity: 0;
  pointer-events: none;
}
.toast[data-visible="true"] {
  transform: translate(-50%, 0);
  opacity: 1;
}

/* ── Landing page ─────────────────────────────────────────────────────────── */
.landing {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  padding: 56px var(--pad-x);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.landing__brand {
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.landing__brand .brand__char { font-size: 46px; }
.landing__brand .brand__name { font-size: 32px; }
.landing__hero {
  max-width: 540px;
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.landing__hero h1 {
  font-family: var(--font-display);
  font-size: 76px;
  font-style: italic;
  font-weight: 500;
  letter-spacing: -2px;
  line-height: .95;
  margin: 0;
}
.landing__hero h1 em { font-style: normal; }
.landing__hero h1 .hanzi { font-family: var(--font-hanzi); font-style: normal; }
.landing__hero p {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-dim);
  margin: 0;
}
.landing__google {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  border: 1px solid var(--ink);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  align-self: flex-start;
  transition: background .15s;
}
.landing__google:hover { background: rgba(244, 236, 219, .06); }
.landing__foot {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* ── Exercise pages ───────────────────────────────────────────────────────── */

/* Start screen (flashcards — unlocks TTS with user gesture) */
.start-screen {
  position: fixed;
  inset: 0;
  background: var(--bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
}
.start-inner {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 16px;
  max-width: 360px;
  padding: 0 24px;
}
.start-title {
  font-family: var(--font-display);
  font-size: 48px;
  font-style: italic;
  font-weight: 500;
  letter-spacing: -1px;
  line-height: 1;
  margin: 0;
}
.start-desc {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 14px;
  color: var(--ink-dim);
  margin: 0;
}

/* Exercise content area */
.ex-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 48px 0;
  max-width: 560px;
  margin: 0 auto;
  width: 100%;
}
.ex-body > #exercise-main { width: 100%; }

/* Question counter shown in topbar */
.ex-kicker {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ink-faint);
}

/* Flashcard hanzi hero */
.hanzi-hero {
  text-align: center;
  padding: 32px 0;
  width: 100%;
}
.hanzi-char {
  font-family: var(--font-hanzi);
  font-size: 120px;
  line-height: 1;
  color: var(--ink);
  cursor: pointer;
  transition: text-shadow .2s;
  display: block;
}
.hanzi-char:hover { text-shadow: 0 0 36px var(--jade); }
.pinyin-text {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--ink-dim);
  margin-top: 14px;
}

/* Answer options (flashcards) */
.options-grid {
  display: flex;
  flex-direction: column;
  gap: 8px;
  width: 100%;
  counter-reset: option;
  margin-bottom: 20px;
}
.option-btn {
  counter-increment: option;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: background .12s, border-color .12s;
  border-radius: 0;
  width: 100%;
}
.option-btn::before {
  content: counter(option, upper-alpha);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1px;
  color: var(--ink-faint);
  min-width: 16px;
  flex-shrink: 0;
}
.option-btn:hover:not(:disabled) { background: var(--bg-raised); border-color: var(--ink-dim); }
.option-btn.correct { border-color: var(--jade); background: var(--jade-dim); }
.option-btn.wrong   { border-color: var(--ember); background: rgba(214, 132, 90, .12); }
.option-btn:disabled { cursor: default; }

/* Feedback line */
.feedback {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  padding: 12px 0;
  min-height: 36px;
  color: var(--ink-dim);
}
.feedback.correct { color: var(--jade); }
.feedback.wrong   { color: var(--ember); }

/* Next / advance button */
.next-btn {
  width: 100%;
  padding: 14px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  cursor: pointer;
  transition: background .12s, border-color .12s;
  border-radius: 0;
}
.next-btn:hover:not(:disabled) { background: var(--bg-raised); border-color: var(--ink-dim); }
.next-btn:disabled { opacity: .35; cursor: default; }

/* Phrase box */
.phrase-box {
  background: var(--bg-raised);
  border: 1px solid var(--line-strong);
  padding: 32px 28px 24px;
  text-align: center;
  width: 100%;
  margin-bottom: 24px;
}
.phrase-hanzi {
  font-family: var(--font-hanzi);
  font-size: 72px;
  line-height: 1.1;
  cursor: pointer;
  color: var(--ink);
  transition: text-shadow .2s;
  display: block;
}
.phrase-hanzi:hover { text-shadow: 0 0 24px var(--jade); }
.phrase-pinyin {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 1.5px;
  color: var(--ink-dim);
  margin-top: 10px;
}
.listen-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  padding: 7px 14px;
  border: 1px solid var(--line-strong);
  background: transparent;
  color: var(--ink-faint);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 1px;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color .12s, color .12s;
  border-radius: 0;
}
.listen-btn:hover { border-color: var(--ink-dim); color: var(--ink); }

/* Translation input (phrase exercise) */
.translation-input {
  width: 100%;
  padding: 12px 0;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink);
  font-family: var(--font-display);
  font-size: 20px;
  font-style: italic;
  outline: none;
  transition: border-color .15s;
  border-radius: 0;
  margin-bottom: 20px;
}
.translation-input::placeholder { color: var(--ink-faint); font-style: italic; }
.translation-input:focus   { border-color: var(--jade); }
.translation-input.correct { border-color: var(--jade); color: var(--jade); }
.translation-input.wrong   { border-color: var(--ember); }
.translation-input:disabled { opacity: .7; }

/* Submit + next row */
.action-row {
  display: flex;
  gap: 10px;
  width: 100%;
}
.action-row .btn-primary { flex: 1; justify-content: center; }
.action-row .next-btn    { flex: 1; }

/* Error / empty state */
.empty-state {
  text-align: center;
  padding: 48px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  color: var(--ink-dim);
}

/* ── Responsive (≤ 720px) ─────────────────────────────────────────────────── */
@media (max-width: 720px) {
  :root { --pad-x: var(--pad-x-mobile); }
  .page { padding: 20px var(--pad-x) 32px; }

  .ghost-char { right: -120px; top: -60px; font-size: 540px; }

  .topbar { padding-bottom: 16px; }
  .brand { gap: 10px; }
  .brand__char { font-size: 26px; }
  .brand__name { font-size: 20px; }
  .brand__meta { display: none; }
  .topbar__greet { display: none; }

  .lede { grid-template-columns: 1fr; gap: 22px; padding: 18px 0 22px; }
  .display { font-size: 28px; }

  .exercises { grid-template-columns: 1fr; gap: 10px; }
  .exercise-card {
    padding: 14px;
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 0 16px;
    align-items: center;
  }
  .exercise-card__head { flex-direction: column-reverse; align-items: flex-start; gap: 4px; grid-column: 1; grid-row: 1 / span 2; }
  .exercise-card__stat { font-size: 32px; }
  .exercise-card__title { font-size: 16px; grid-column: 2; }
  .exercise-card__blurb { font-size: 11px; grid-column: 2; }
  .exercise-card__foot { border: 0; margin: 0; padding: 0; flex-direction: column; align-items: flex-end; gap: 2px; }
  .exercise-card__count { display: none; }

  .vocab__head { padding-bottom: 10px; margin-bottom: 12px; }
  .vocab__heading .section-title { font-size: 17px; }
  .vocab-grid { grid-template-columns: repeat(4, 1fr); }
  .vocab-card { min-height: 110px; padding: 14px 8px 12px; }
  .vocab-card__hanzi { font-size: 36px; }

  .settings-lede { grid-template-columns: 1fr; gap: 20px; padding: 20px 0 16px; }
  .settings-display { font-size: 36px; }
  .settings-prose { font-size: 12px; }
  .settings-foot { padding-top: 14px; }
  .settings-foot__note { display: none; }
  .settings-foot__actions { width: 100%; }
  .settings-foot__actions .btn-ghost   { flex: 1; justify-content: center; }
  .settings-foot__actions .btn-primary { flex: 2; justify-content: center; }

  .landing { padding: 32px var(--pad-x); }
  .landing__hero h1 { font-size: 52px; }
  .landing__brand .brand__char { font-size: 36px; }
  .landing__brand .brand__name { font-size: 26px; }

  .ex-body { padding: 24px 0; }
  .hanzi-char { font-size: 88px; }
  .phrase-hanzi { font-size: 54px; }
  .start-title { font-size: 36px; }
}