:root {
  --bg: #f6f1e8;
  --card: #fffaf1;
  --text: #29231f;
  --muted: #6f6258;
  --line: #e4d7c7;
  --accent: #8a5a35;
  --accent-dark: #654125;
  --green: #247a45;
  --yellow: #a56a00;
  --red: #a3342a;
  --blue: #386c8f;
  --shadow: 0 18px 45px rgba(68, 45, 28, .10);
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: radial-gradient(circle at top left, #fff7e8, var(--bg) 55%);
  color: var(--text);
}

button, select, input { font: inherit; }
button { cursor: pointer; border: 0; }
button:disabled { opacity: .45; cursor: not-allowed; }

.app-header {
  max-width: 1180px;
  margin: 0 auto;
  padding: 32px 20px 18px;
  display: flex;
  justify-content: space-between;
  gap: 20px;
  align-items: flex-start;
}
.eyebrow { margin: 0 0 6px; color: var(--accent); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; font-size: 12px; }
h1 { margin: 0; font-size: clamp(28px, 5vw, 46px); line-height: 1.08; }
h2 { margin-top: 0; }
.subtitle { color: var(--muted); max-width: 760px; line-height: 1.7; margin: 12px 0 0; }
.header-actions { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }

.tabs {
  max-width: 1180px;
  margin: 0 auto 12px;
  padding: 0 20px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
}
.tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,250,243,.92);
  color: var(--accent-dark);
  font-weight: 700;
}
.tab.active { background: var(--accent); color: white; border-color: var(--accent); }
.tab-badge { min-width: 22px; height: 22px; padding: 0 7px; display: inline-flex; align-items: center; justify-content: center; border-radius: 999px; background: rgba(0,0,0,.1); font-size: 12px; }
.tab.active .tab-badge { background: rgba(255,255,255,.2); }

.app-main, footer { max-width: 1180px; margin: 0 auto; }
.view { display: none; padding: 0 20px 36px; }
.view.active { display: block; }

.layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 360px;
  gap: 20px;
}
.card {
  background: rgba(255, 250, 241, .92);
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
  padding: 22px;
}
.test-card { min-height: 650px; }
.toolbar { display: flex; gap: 14px; flex-wrap: wrap; justify-content: space-between; }
.toolbar label, .settings-grid label { display: block; color: var(--muted); font-size: 13px; margin-bottom: 6px; }
select, .search {
  border: 1px solid var(--line);
  background: white;
  border-radius: 12px;
  padding: 10px 12px;
  color: var(--text);
}
.search { width: 100%; }
.progress-wrap { margin: 22px 0; }
.progress-line { display: flex; justify-content: space-between; color: var(--muted); font-size: 14px; gap: 12px; }
.progress-bar { height: 10px; background: #eee2d1; border-radius: 999px; overflow: hidden; margin-top: 8px; }
#progressFill, #masteryFill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), #c58b58); transition: width .2s ease; }

.word-card {
  margin: 20px 0;
  min-height: 340px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  border: 1px dashed #dcc8b4;
  border-radius: 22px;
  padding: 26px;
  background: linear-gradient(180deg, rgba(255,255,255,.6), rgba(255,247,232,.6));
}
.review-word-card { min-height: 380px; }
.rank { margin: 0; color: var(--muted); font-weight: 600; }
.word-card h2 { margin: 10px 0 4px; font-size: clamp(56px, 10vw, 110px); letter-spacing: -.04em; }
.pos { margin: 0 0 12px; color: var(--accent-dark); font-weight: 700; }
.small { padding: 7px 10px !important; font-size: 14px; }
.ghost { background: transparent; color: var(--accent); border: 1px solid var(--line); border-radius: 999px; }
details { width: min(100%, 640px); margin-top: 18px; text-align: left; }
summary { color: var(--accent); cursor: pointer; text-align: center; }
.details-content { margin-top: 12px; color: var(--muted); line-height: 1.65; background: rgba(255,255,255,.65); border-radius: 14px; padding: 14px; word-break: break-word; }

.choice-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.choice { color: white; padding: 18px 14px; border-radius: 18px; font-weight: 800; font-size: 18px; box-shadow: 0 10px 24px rgba(0,0,0,.08); }
.mastered { background: var(--green); }
.familiar { background: var(--yellow); }
.unknown { background: var(--red); }
.nav-row { display: flex; justify-content: space-between; margin-top: 14px; gap: 12px; }
.secondary, .file-label {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fffaf3;
  color: var(--accent-dark);
  text-decoration: none;
}
.file-label input { display: none; }

.side-panel { display: flex; flex-direction: column; gap: 20px; }
.side-panel h2 { margin: 0 0 14px; }
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.large-stats { grid-template-columns: repeat(4, 1fr); }
.stats-grid div, .review-summary div {
  background: rgba(255,255,255,.65);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 14px;
}
.stats-grid strong, .review-summary strong { display: block; font-size: 28px; }
.stats-grid span, .review-summary span { color: var(--muted); font-size: 13px; }
.review-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin: 18px 0 6px; }
.section-header { display: flex; justify-content: space-between; gap: 16px; align-items: flex-start; margin-bottom: 12px; }
.list-header { display: flex; justify-content: space-between; gap: 10px; align-items: center; }
.hint { color: var(--muted); line-height: 1.6; font-size: 14px; margin-top: 0; }
.filter-row { display: flex; gap: 8px; flex-wrap: wrap; margin: 12px 0; }
.pill { border: 1px solid var(--line); border-radius: 999px; padding: 7px 10px; background: white; color: var(--muted); }
.pill.active { background: var(--accent); color: white; border-color: var(--accent); }
.study-list { max-height: 360px; overflow: auto; display: flex; flex-direction: column; gap: 8px; padding-right: 2px; }
.compact-list { max-height: 360px; }
.large-list { max-height: 68vh; margin-top: 14px; }
.study-item { text-align: left; width: 100%; background: white; border: 1px solid var(--line); border-radius: 14px; padding: 10px 12px; color: var(--text); }
.study-item:hover { border-color: #c7a98d; transform: translateY(-1px); }
.study-item small { display: block; color: var(--muted); margin-top: 2px; }
.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; color: white; font-size: 12px; margin-left: 6px; vertical-align: middle; }
.badge.mastered { background: var(--green); }
.badge.familiar { background: var(--yellow); }
.badge.unknown { background: var(--red); }
.badge.untested { background: var(--muted); }
.badge.due { background: var(--blue); }

.review-card, .list-page-card, .stats-page-card, .settings-card { margin-bottom: 24px; }
.settings-grid { display: grid; grid-template-columns: 1fr 220px; gap: 16px; margin: 12px 0 16px; }
.maintenance-row { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 12px; }
.danger { background: var(--red); color: white; padding: 10px 14px; border-radius: 14px; }
footer { padding: 0 20px 28px; color: var(--muted); font-size: 13px; }

@media (max-width: 900px) {
  .app-header { flex-direction: column; }
  .layout { grid-template-columns: 1fr; }
  .choice-grid, .review-summary, .large-stats, .settings-grid { grid-template-columns: 1fr; }
  .word-card h2 { font-size: 64px; }
  .header-actions { justify-content: flex-start; }
  .section-header { flex-direction: column; }
}