/* ============================================================
   360 Động từ bất quy tắc — giao diện
   Phong cách: sáng, tông cam ấm (amber), thân thiện học sinh
   ============================================================ */
:root {
  --bg:        #fbf4ec;
  --bg-2:      #f5e8d8;
  --surface:   #ffffff;
  --line:      #eee0cf;
  --ink:       #2c2114;
  --ink-2:     #6a5b48;
  --ink-3:     #9a8a75;

  --primary:   #e8730c;   /* cam ấm */
  --primary-d: #c25c07;
  --primary-l: #ffefe0;

  --ok:        #14a35a;
  --ok-bg:     #e3f8ec;
  --err:       #e5484d;
  --err-bg:    #fdecec;

  --font: "Nunito", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --shadow-sm: 0 1px 2px rgba(44,33,20,.06), 0 3px 12px rgba(44,33,20,.05);
  --shadow-md: 0 8px 26px rgba(44,33,20,.10);
  --r-sm: 10px; --r-md: 14px; --r-lg: 20px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
  font-family: var(--font);
  color: var(--ink);
  background:
    radial-gradient(1100px 480px at 82% -12%, #ffe9d3 0%, transparent 58%),
    radial-gradient(900px 440px at -6% 0%, #ffe4e0 0%, transparent 55%),
    var(--bg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.page { max-width: 960px; margin: 0 auto; padding: 16px 18px 52px; }

/* ---------- Nút quay lại ---------- */
.topbar { display: flex; margin-bottom: 14px; }
.back {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font); font-size: 14.5px; font-weight: 700;
  color: var(--ink-2);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 8px 15px 8px 12px;
  cursor: pointer; box-shadow: var(--shadow-sm);
  transition: color .15s, transform .05s;
}
.back:hover { color: var(--primary); }
.back:active { transform: scale(.97); }
.back:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(232,115,12,.3); }

/* ---------- Tiêu đề ---------- */
.hero { text-align: center; margin: 4px 0 20px; }
.hero__title {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 900; letter-spacing: -.02em; line-height: 1.12;
  background: linear-gradient(120deg, #c25c07, #e8730c 50%, #e0417a);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero__desc {
  max-width: 640px; margin: 10px auto 0;
  font-size: clamp(.92rem, 2.2vw, 1.02rem);
  font-weight: 500; color: var(--ink-2); line-height: 1.55;
}

/* ---------- Tabs ---------- */
.tabs {
  display: flex; gap: 6px; justify-content: center;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 5px; width: max-content; margin: 0 auto 22px;
  box-shadow: var(--shadow-sm);
}
.tab {
  font-family: var(--font); font-size: 14.5px; font-weight: 800;
  color: var(--ink-2); background: transparent;
  border: none; border-radius: 999px;
  padding: 10px 24px; cursor: pointer;
  transition: color .15s, background .15s;
}
.tab.is-active { color: #fff; background: var(--primary); box-shadow: 0 4px 14px rgba(232,115,12,.4); }
.tab:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(232,115,12,.32); }

.panel[hidden] { display: none; }
.panel { animation: fade .25s ease; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------- Thanh tìm kiếm ---------- */
.searchbar { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; flex-wrap: wrap; }
.search {
  flex: 1; min-width: 200px;
  font-family: var(--font); font-size: 15px; font-weight: 600;
  color: var(--ink);
  background: var(--surface);
  border: 1.5px solid var(--line);
  border-radius: 999px;
  padding: 11px 18px;
  box-shadow: var(--shadow-sm);
}
.search:focus-visible { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(232,115,12,.16); }
.count { font-size: 13px; font-weight: 800; color: var(--ink-3); white-space: nowrap; }

/* ---------- Bảng ---------- */
.table {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.thead, .trow {
  display: grid;
  grid-template-columns: 1.1fr 1.2fr 1.4fr 1.6fr auto;
  align-items: center;
  gap: 10px;
  padding: 12px 18px;
}
.thead {
  background: var(--primary-l);
  font-size: 12px; font-weight: 800; letter-spacing: .02em;
  color: var(--primary-d);
  text-transform: uppercase;
}
.tbody { max-height: 62vh; overflow-y: auto; }
.trow { border-top: 1px solid var(--line); font-size: 15px; }
.trow:nth-child(even) { background: #fdfaf6; }
.c { font-weight: 700; color: var(--ink); font-variant-ligatures: none; }
.c--v1 { color: var(--primary-d); font-weight: 900; }
.c--mean { font-weight: 600; color: var(--ink-2); }
.listen {
  font-family: var(--font); font-size: 12.5px; font-weight: 800;
  color: var(--primary-d);
  background: var(--primary-l);
  border: none; border-radius: 999px;
  padding: 6px 14px; cursor: pointer;
  transition: background .15s, color .15s;
}
.listen:hover { background: var(--primary); color: #fff; }
.listen:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(232,115,12,.3); }

.empty { text-align: center; color: var(--ink-3); font-weight: 700; padding: 26px; }

/* ---------- Luyện tập ---------- */
.quiz {
  max-width: 560px; margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  padding: 26px 24px;
}
.quiz__heading { font-size: 1.15rem; font-weight: 900; text-align: center; margin-bottom: 18px; }
.quiz__label { font-size: 14px; font-weight: 800; color: var(--ink-2); margin-bottom: 10px; text-align: center; }
.seg { display: flex; background: var(--bg); border-radius: var(--r-sm); padding: 4px; gap: 4px; margin: 0 auto 22px; width: max-content; max-width: 100%; flex-wrap: wrap; justify-content: center; }
.seg__btn {
  font-family: var(--font); font-weight: 800; font-size: 14px;
  color: var(--ink-2); background: transparent;
  border: none; border-radius: 8px;
  padding: 9px 16px; cursor: pointer;
  transition: background .15s, color .15s;
}
.seg__btn.is-on { background: #fff; color: var(--primary-d); box-shadow: var(--shadow-sm); }

.btn { font-family: var(--font); font-weight: 800; font-size: 15px; border: none; border-radius: var(--r-sm); cursor: pointer; transition: background .15s, transform .05s; }
.btn--primary { background: var(--primary); color: #fff; padding: 12px 22px; box-shadow: 0 3px 10px rgba(232,115,12,.35); }
.btn--primary:hover { background: var(--primary-d); }
.btn--primary:active { transform: translateY(1px); }
.btn--soft { background: var(--primary-l); color: var(--primary-d); padding: 12px 20px; }
.btn--soft:hover { background: #ffe1c6; }
.btn--ghost { background: var(--surface); color: var(--ink-2); border: 1px solid var(--line); padding: 12px 20px; }
.btn--ghost:hover { color: var(--ink); }
.btn--lg { width: 100%; padding: 15px; font-size: 16px; }
.btn:focus-visible { outline: none; box-shadow: 0 0 0 3px rgba(232,115,12,.32); }

.quiz__stats { display: flex; gap: 10px; margin-bottom: 18px; }
.stat { flex: 1; text-align: center; background: var(--bg); border-radius: var(--r-sm); padding: 10px 6px; }
.stat__k { display: block; font-size: 12px; font-weight: 700; color: var(--ink-3); text-transform: uppercase; letter-spacing: .04em; }
.stat__v { display: block; font-size: 1.5rem; font-weight: 900; color: var(--ink); font-variant-numeric: tabular-nums; }

.quiz__prompt { text-align: center; padding: 8px 0 18px; }
.quiz__v1 { display: block; font-size: clamp(1.8rem, 7vw, 2.6rem); font-weight: 900; color: var(--ink); }
.quiz__mean { display: block; font-size: 1rem; font-weight: 700; color: var(--ink-3); margin-top: 4px; }

.quiz__fields { display: flex; flex-direction: column; gap: 12px; margin-bottom: 8px; }
.q-field { display: flex; flex-direction: column; gap: 6px; }
.q-field[hidden] { display: none; }
.q-field span { font-size: 12.5px; font-weight: 800; color: var(--ink-3); text-transform: uppercase; letter-spacing: .03em; }
.q-input {
  font-family: var(--font); font-size: 1.25rem; font-weight: 800;
  text-align: center; color: var(--ink);
  background: var(--bg);
  border: 2px solid var(--line);
  border-radius: var(--r-md);
  padding: 12px;
}
.q-input:focus-visible { outline: none; border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(232,115,12,.16); }
.q-input.is-ok { border-color: var(--ok); background: var(--ok-bg); }
.q-input.is-err { border-color: var(--err); background: var(--err-bg); }

.quiz__feedback { text-align: center; font-weight: 800; font-size: 15px; min-height: 26px; padding: 10px 0; }
.quiz__feedback.ok { color: var(--ok); }
.quiz__feedback.err { color: var(--err); }
.quiz__feedback strong { color: var(--ink); }
.quiz__actions { display: flex; gap: 10px; flex-wrap: wrap; }
.quiz__actions .btn { flex: 1; min-width: 110px; }

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  .page { padding: 12px 12px 40px; }
  .thead { display: none; }
  .trow {
    grid-template-columns: 1fr auto;
    column-gap: 10px; row-gap: 3px;
    padding: 12px 16px;
  }
  .trow .c--v1 { grid-column: 1; grid-row: 1; font-size: 1.2rem; }
  .trow .c[data-l="V2"] { grid-column: 1; grid-row: 2; }
  .trow .c[data-l="V3"] { grid-column: 1; grid-row: 3; }
  .trow .c--mean { grid-column: 1; grid-row: 4; }
  .trow .listen { grid-column: 2; grid-row: 1 / span 4; align-self: center; }
  .c { font-size: 14px; }
  .c[data-l]::before {
    content: attr(data-l) ": ";
    font-size: 11px; font-weight: 800; color: var(--ink-3);
  }
}

@media (prefers-reduced-motion: reduce) {
  .panel, .back, .tab, .btn { transition: none; animation: none; }
}