:root {
  --bg: #081427;
  --bg2: #10213c;
  --panel: #152842;
  --panel2: #1b314f;
  --text: #edf4ff;
  --muted: #b9c9df;
  --accent: #ffd166;
  --accent2: #7ee0ff;
  --danger: #ff7a7a;
  --line: rgba(255,255,255,.08);
  --shadow: 0 18px 48px rgba(0,0,0,.28);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  color: var(--text);
  background: radial-gradient(circle at top, #12305b 0%, var(--bg) 35%, #05101f 100%);
}
.page-shell { max-width: 1320px; margin: 0 auto; padding: 28px 18px 60px; }
.hero, .panel {
  background: linear-gradient(180deg, rgba(23,44,71,.95), rgba(15,31,50,.95));
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}
.hero { text-align: center; padding: 40px 24px; margin-bottom: 22px; }
.hero-badge {
  display: inline-block; background: rgba(255,209,102,.14); border: 1px solid rgba(255,209,102,.35);
  color: var(--accent); padding: 8px 14px; border-radius: 999px; font-weight: 700; margin-bottom: 12px;
}
.hero h1 { margin: 0 0 12px; font-size: clamp(2rem, 4vw, 3.4rem); color: var(--accent); }
.hero p { max-width: 920px; margin: 0 auto; color: var(--muted); font-size: 1.08rem; line-height: 1.7; }
.hero-pills { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; margin-top: 18px; }
.hero-pills span, .tab, button { border-radius: 999px; }
.hero-pills span, .tab {
  background: rgba(126,224,255,.1); color: var(--text); border: 1px solid rgba(126,224,255,.18); padding: 10px 14px; font-weight: 700;
}
.quick-tools { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; padding: 18px; margin-bottom: 22px; }
.tool-card, .lesson-card, .quiz-box, .result-card, .sentence-card {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel2) 100%); border: 1px solid var(--line); border-radius: 20px; padding: 18px;
}
.tool-card h2, .lesson-card h3 { margin-top: 0; color: var(--accent); }
input, textarea, select {
  width: 100%; margin-top: 10px; padding: 14px 14px; border-radius: 14px; border: 1px solid rgba(255,255,255,.12);
  background: rgba(255,255,255,.96); color: #1d2740; font-size: 1rem;
}
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
button { border: 0; cursor: pointer; font-weight: 800; padding: 13px 18px; background: var(--accent); color: #14233e; }
button.secondary { background: var(--accent2); }
button.danger { background: var(--danger); color: #fff; }
.feedback, .soft-note { margin-top: 12px; color: var(--muted); background: rgba(255,255,255,.05); padding: 12px 14px; border-radius: 14px; }
.tabs-panel { padding: 18px; }
.tab-row { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 18px; }
.tab { cursor: pointer; background: rgba(255,255,255,.08); color: var(--text); }
.tab.active { background: var(--accent); color: #14233e; }
.tab-content { display: none; }
.tab-content.active { display: block; }
.content-grid, .results-grid { display: grid; gap: 16px; grid-template-columns: repeat(3, minmax(0, 1fr)); }
.lesson-card ul { padding-left: 20px; color: var(--muted); }
.lesson-card p, .lesson-card li, .table-like .row span, .sentence-card p, .result-card p { line-height: 1.65; }
.example { color: var(--accent2); font-style: italic; }
.checklist { display: grid; grid-template-columns: repeat(5, minmax(0, 1fr)); gap: 10px; margin-top: 10px; }
.checklist div { background: rgba(255,255,255,.05); border: 1px solid var(--line); border-radius: 16px; padding: 14px; }
.table-like { border: 1px solid var(--line); border-radius: 18px; overflow: hidden; }
.table-like .row { display: grid; grid-template-columns: 1fr 1fr 1fr 2fr; }
.table-like .row span { padding: 14px; border-bottom: 1px solid var(--line); }
.table-like .row.head { background: rgba(255,209,102,.12); font-weight: 800; color: var(--accent); }
.sentence-card h3, .result-card h3 { margin-top: 0; color: var(--accent2); text-transform: capitalize; }
.result-card small { color: var(--muted); display: block; margin-top: 8px; }
.quiz-box { min-height: 180px; margin-bottom: 12px; }
.correct { color: #8effb1; }
.almost { color: #ffd166; }
.wrong { color: #ff9a9a; }
@media (max-width: 1024px) {
  .quick-tools, .content-grid, .results-grid, .checklist { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 700px) {
  .quick-tools, .content-grid, .results-grid, .checklist, .table-like .row { grid-template-columns: 1fr; }
  .page-shell { padding: 16px 12px 40px; }
  .hero { padding: 28px 18px; }
}