:root {
  color-scheme: light;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #17312b;
  background: #f4f7f3;
  --green: #173f35;
  --mint: #d9eee4;
  --line: #c8d5ce;
  --danger: #9f332d;
}
* { box-sizing: border-box; }
body { margin: 0; min-height: 100vh; background: linear-gradient(180deg, #edf5ef 0, #f8f6ef 42%); padding: env(safe-area-inset-top) 0 calc(82px + env(safe-area-inset-bottom)); }
button, input, select, textarea { font: inherit; }
button, .file-button { min-height: 48px; border-radius: 14px; border: 1px solid var(--green); padding: 11px 16px; cursor: pointer; touch-action: manipulation; }
button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible { outline: 3px solid #e9aa42; outline-offset: 2px; }
.app-header { max-width: 720px; margin: 0 auto; padding: 22px 18px 8px; display: flex; align-items: center; justify-content: space-between; gap: 12px; }
h1 { font-size: 1.55rem; margin: 2px 0; }
h2 { font-size: 1.25rem; margin: 0 0 12px; }
p { line-height: 1.55; }
.eyebrow { margin: 0; color: #587068; font-size: .78rem; letter-spacing: .08em; text-transform: uppercase; }
.status-chip { font-size: .78rem; padding: 6px 9px; border-radius: 999px; background: #fff; border: 1px solid var(--line); text-align: center; }
main { max-width: 720px; margin: 0 auto; padding: 8px 14px; }
.page { display: none; }
.page.active { display: block; }
.card { background: rgba(255,255,255,.94); border: 1px solid var(--line); border-radius: 20px; box-shadow: 0 8px 28px rgba(23,63,53,.07); padding: 18px; margin: 10px 0; }
.hero-card { padding: 22px; }
.row { display: flex; align-items: center; gap: 10px; }
.between { justify-content: space-between; }
.end { justify-content: flex-end; }
.wrap { flex-wrap: wrap; }
.timer { font-variant-numeric: tabular-nums; font-size: 1.25rem; font-weight: 700; background: var(--mint); padding: 10px 13px; border-radius: 14px; }
label { display: block; font-size: .9rem; margin: 12px 0 6px; }
input, select, textarea { width: 100%; border: 1px solid #9dafaa; border-radius: 12px; padding: 12px; background: white; color: inherit; font-size: 16px; }
.primary { color: white; background: var(--green); width: 100%; margin-top: 14px; }
.secondary, .file-button { background: white; color: var(--green); }
.file-button { display: inline-flex; align-items: center; margin: 8px 0; }
.file-button input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.hidden { display: none !important; }
.notice { padding: 12px; border-radius: 12px; background: #fff2cf; }
.muted { color: #66736e; font-size: .9rem; }
.practice { min-height: 310px; }
.question-meaning { font-size: 1.3rem; margin: 8px 0; }
.example { padding: 14px; border-radius: 13px; background: #eef4ef; line-height: 1.7; }
.answer-blank { display: inline-block; min-width: 5.2em; height: 1.25em; overflow: hidden; color: transparent; vertical-align: text-bottom; border-radius: 5px; background: #b9cec3; }
.answer-input { font-size: 1.25rem; margin-top: 14px; }
.danger-link { color: var(--danger); background: transparent; border-color: #d8aaa7; }
.feedback { border-left: 4px solid var(--green); padding: 8px 14px; margin: 14px 0; background: #f1f6f3; }
.correct-answer { font-size: 1.65rem; font-weight: 750; letter-spacing: .02em; }
.word-list { display: grid; gap: 10px; }
.word-card { background: white; border: 1px solid var(--line); border-radius: 17px; padding: 14px; }
.word-card h3 { margin: 0 0 4px; font-size: 1.2rem; }
.word-meta { color: #64716c; font-size: .86rem; }
.tag { display: inline-block; padding: 3px 8px; margin: 2px 4px 2px 0; border-radius: 999px; background: var(--mint); font-size: .78rem; }
.word-actions button { min-height: 40px; padding: 7px 11px; margin-top: 8px; }
.import-preview { margin-top: 12px; border-top: 1px solid var(--line); padding-top: 12px; }
.optional-list, .quick-add { margin-top: 14px; }
.optional-list summary, .quick-add summary { cursor: pointer; color: var(--green); font-weight: 650; }
.quick-add form { margin-top: 12px; }
.switch-row { display: flex; align-items: center; gap: 10px; }
.switch-row input { width: 22px; height: 22px; }
.bottom-nav { position: fixed; inset: auto 0 0; z-index: 10; display: grid; grid-template-columns: repeat(3, 1fr); gap: 6px; padding: 8px 10px calc(8px + env(safe-area-inset-bottom)); background: rgba(248,250,247,.96); border-top: 1px solid var(--line); backdrop-filter: blur(12px); }
.bottom-nav button { border: 0; background: transparent; color: #54645e; padding: 8px; }
.bottom-nav button.active { background: var(--mint); color: var(--green); font-weight: 700; }
dialog { width: min(92vw, 520px); border: 0; border-radius: 20px; padding: 0; box-shadow: 0 18px 80px rgba(0,0,0,.25); }
dialog::backdrop { background: rgba(8,24,19,.48); }
dialog form { padding: 20px; max-height: 88vh; overflow: auto; }
.toast { position: fixed; z-index: 30; left: 50%; bottom: calc(92px + env(safe-area-inset-bottom)); transform: translateX(-50%); width: min(90vw, 480px); padding: 12px 16px; border-radius: 13px; background: #17312b; color: white; text-align: center; }
@media (max-width: 430px) {
  .app-header { align-items: flex-start; }
  .status-chip { max-width: 112px; }
  .card { padding: 16px; }
  .practice { padding-bottom: 22px; }
  .practice .primary { position: sticky; bottom: 4px; }
}