:root {
  --bg: #f5efe3;
  --surface: #fffdf8;
  --surface-soft: #efe5d4;
  --ink: #253128;
  --muted: #69736b;
  --accent: #44745a;
  --accent-dark: #315944;
  --accent-soft: #dce9df;
  --gold: #a87932;
  --gold-soft: #f3e7cd;
  --danger: #9b4b45;
  --danger-soft: #f6dfdc;
  --line: #ded5c5;
  --shadow: 0 18px 50px rgba(65, 53, 37, 0.09);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--ink);
  background: var(--bg);
}

* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: radial-gradient(circle at 20% 0%, #fff9ec 0, transparent 36%), var(--bg); }
button, input { font: inherit; }
button { color: inherit; }
button:focus-visible, input:focus-visible { outline: 3px solid rgba(68, 116, 90, .25); outline-offset: 3px; }

.app-shell { width: min(980px, calc(100% - 28px)); margin: 0 auto; padding: 18px 0 56px; }
.topbar { display: flex; align-items: center; justify-content: space-between; min-height: 58px; }
.brand { display: inline-flex; align-items: center; gap: 10px; border: 0; background: transparent; font-size: 1.05rem; font-weight: 800; cursor: pointer; padding: 8px 4px; }
.brand-mark { display: grid; place-items: center; width: 34px; height: 34px; border-radius: 50%; background: var(--accent-soft); }
.icon-button { border: 0; background: transparent; width: 42px; height: 42px; border-radius: 50%; cursor: pointer; font-size: 1.35rem; }
.icon-button:hover { background: rgba(37, 49, 40, .06); }

[hidden] { display: none !important; }
.hero-card, .patterns-card, .explore-card, .exercise-card { background: rgba(255, 253, 248, .92); border: 1px solid rgba(222, 213, 197, .84); box-shadow: var(--shadow); }
.hero-card { padding: clamp(28px, 6vw, 58px); border-radius: var(--radius-lg); text-align: center; margin-top: 18px; }
.eyebrow { margin: 0 0 9px; color: var(--accent); font-size: .78rem; font-weight: 800; text-transform: uppercase; letter-spacing: .09em; }
h1 { margin: 0; font-size: clamp(2.15rem, 7vw, 4.5rem); line-height: .98; letter-spacing: -.045em; }
h2 { margin: 0; font-size: 1.32rem; letter-spacing: -.02em; }
.hero-copy { margin: 18px auto 26px; max-width: 620px; color: var(--muted); font-size: 1.04rem; line-height: 1.6; }
.tiny-copy { margin: 12px 0 0; color: var(--muted); font-size: .84rem; }

.primary-button, .secondary-button, .danger-button, .text-button, .mode-card, .chip { border: 0; cursor: pointer; }
.primary-button { background: var(--accent); color: #fff; padding: 13px 20px; border-radius: 999px; font-weight: 800; min-height: 48px; }
.primary-button:hover { background: var(--accent-dark); }
.hero-button { min-width: min(100%, 300px); font-size: 1.02rem; }
.secondary-button { background: var(--surface-soft); padding: 11px 16px; border-radius: 999px; font-weight: 750; }
.secondary-button:hover { filter: brightness(.97); }
.text-button { background: transparent; padding: 9px 6px; color: var(--muted); font-weight: 750; }
.danger-button { background: var(--danger-soft); color: var(--danger); padding: 11px 15px; border-radius: 12px; font-weight: 800; }

.mode-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 14px; margin: 18px 0; }
.mode-card { display: flex; gap: 14px; align-items: center; text-align: left; padding: 20px; border-radius: var(--radius-md); background: rgba(255, 253, 248, .78); border: 1px solid var(--line); }
.mode-card:hover { transform: translateY(-1px); box-shadow: 0 10px 28px rgba(65, 53, 37, .07); }
.mode-card strong, .mode-card small { display: block; }
.mode-card small { margin-top: 4px; color: var(--muted); line-height: 1.35; }
.mode-icon { display: grid; place-items: center; flex: 0 0 auto; width: 42px; height: 42px; border-radius: 13px; background: var(--accent-soft); font-size: 1.25rem; font-weight: 900; }

.patterns-card, .explore-card { border-radius: var(--radius-md); padding: 24px; margin-top: 18px; }
.section-heading-row { display: flex; justify-content: space-between; gap: 16px; align-items: flex-end; }
.patterns-empty { color: var(--muted); margin-top: 14px; line-height: 1.55; }
.pattern-groups { display: grid; gap: 16px; margin-top: 18px; }
.pattern-group h3 { margin: 0 0 8px; font-size: .85rem; color: var(--muted); }
.pattern-list { display: flex; flex-wrap: wrap; gap: 8px; }
.pattern-badge { padding: 8px 10px; border-radius: 999px; font-size: .88rem; background: var(--surface-soft); }
.pattern-badge.solid { background: var(--accent-soft); }
.pattern-badge.review { background: var(--gold-soft); }

.chip-grid { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 16px; }
.chip { background: #f1eadf; padding: 9px 12px; border-radius: 999px; font-size: .9rem; }
.chip:hover { background: var(--accent-soft); }

.train-topline { display: flex; justify-content: space-between; align-items: center; gap: 14px; margin: 16px 0 12px; }
.session-pill { color: var(--muted); background: rgba(255, 253, 248, .7); border: 1px solid var(--line); border-radius: 999px; padding: 7px 10px; font-size: .8rem; font-weight: 750; }
.exercise-card { border-radius: var(--radius-lg); padding: clamp(22px, 5vw, 42px); min-height: 520px; }
.exercise-meta { min-height: 26px; display: flex; justify-content: space-between; gap: 16px; color: var(--muted); font-size: .78rem; font-weight: 750; }
.focus-label { color: var(--accent); }
.exercise-context { font-size: clamp(1.16rem, 3.8vw, 1.55rem); line-height: 1.65; letter-spacing: -.012em; padding: 26px 0 20px; max-width: 820px; }
.answer-slot { display: inline-flex; align-items: baseline; gap: 7px; white-space: nowrap; }
.exercise-context .blank { display: inline-block; min-width: 110px; padding: 0 6px 2px; border-bottom: 2px solid var(--accent); color: var(--accent); font-weight: 800; letter-spacing: .08em; text-align: center; }
.exercise-context .infinitive { color: var(--muted); font-size: .78em; font-weight: 750; letter-spacing: 0; }
.context-note { display: block; margin-top: 16px; font-size: .9rem; line-height: 1.5; color: var(--muted); }
.answer-area { margin-top: 8px; }
.answer-label { display: block; margin-bottom: 8px; color: var(--muted); font-size: .86rem; font-weight: 750; }
.answer-row { display: flex; gap: 10px; }
.answer-row input { flex: 1; min-width: 0; border: 1.5px solid var(--line); border-radius: 15px; background: #fff; color: var(--ink); padding: 13px 15px; font-size: 1.08rem; }
.answer-row input:disabled { background: #f5f1e9; color: var(--muted); }
.support-row { display: flex; align-items: center; gap: 10px; margin-top: 12px; min-height: 42px; }
.hint-level-label { color: var(--muted); font-size: .8rem; }
.hint-box { margin-top: 10px; padding: 14px 16px; background: var(--gold-soft); border-radius: var(--radius-sm); line-height: 1.5; }

.feedback { margin-top: 24px; border-top: 1px solid var(--line); padding-top: 22px; }
.feedback-head { display: flex; align-items: baseline; flex-wrap: wrap; gap: 8px 12px; }
.feedback-answer { font-size: 1.3rem; font-weight: 900; }
.feedback-status { font-size: .82rem; font-weight: 850; padding: 5px 8px; border-radius: 999px; }
.feedback-status.correct { background: var(--accent-soft); color: var(--accent-dark); }
.feedback-status.orthography { background: var(--gold-soft); color: #76551f; }
.feedback-status.error { background: var(--danger-soft); color: var(--danger); }
.feedback p { margin: 10px 0 0; line-height: 1.55; }
.grammar-name { color: var(--muted); font-size: .88rem; font-weight: 800; }
.contrast-box { margin-top: 14px; padding: 14px 16px; border-radius: var(--radius-sm); background: var(--surface-soft); }
.contrast-box strong { display: block; margin-bottom: 5px; }
.post-answer-actions { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 22px; }

.settings-dialog { border: 0; border-radius: 20px; padding: 0; width: min(92vw, 460px); background: transparent; }
.settings-dialog::backdrop { background: rgba(22, 28, 24, .42); backdrop-filter: blur(2px); }
.dialog-card { background: var(--surface); padding: 24px; border-radius: 20px; box-shadow: var(--shadow); }
.dialog-card p { color: var(--muted); line-height: 1.5; }
.dialog-heading { display: flex; justify-content: space-between; align-items: center; }
.toast { position: fixed; left: 50%; bottom: 22px; transform: translateX(-50%); background: #263229; color: #fff; padding: 10px 14px; border-radius: 999px; box-shadow: var(--shadow); font-size: .88rem; }

@media (max-width: 650px) {
  .app-shell { width: min(100% - 18px, 980px); padding-top: 8px; }
  .mode-grid { grid-template-columns: 1fr; }
  .hero-card { margin-top: 8px; }
  .answer-row { align-items: stretch; }
  .answer-row .primary-button { padding-inline: 14px; }
  .exercise-card { min-height: 0; }
}

@media (max-width: 430px) {
  .answer-row { flex-direction: column; }
  .answer-row .primary-button { width: 100%; }
  .train-topline { align-items: flex-start; }
}