/* ============================================================
   Eiken Pre-1 Vocab Bootcamp — Standalone Stylesheet
   Amber/deep-orange theme (distinct from existing Eiken red).
   ============================================================ */
* { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --evb-bg-1: #fff7ed;
  --evb-bg-2: #ffedd5;
  --evb-amber-50: #fffbeb;
  --evb-amber-100: #fef3c7;
  --evb-amber-200: #fde68a;
  --evb-amber-300: #fcd34d;
  --evb-amber-500: #f59e0b;
  --evb-amber-600: #d97706;
  --evb-amber-700: #b45309;
  --evb-amber-800: #92400e;
  --evb-amber-900: #78350f;
  --evb-ok: #047857;
  --evb-ok-bg: #d1fae5;
  --evb-ng: #b91c1c;
  --evb-ng-bg: #fee2e2;
}
body {
  font-family: 'Hiragino Maru Gothic ProN', 'Hiragino Kaku Gothic ProN', 'Segoe UI', system-ui, sans-serif;
  background: linear-gradient(180deg, var(--evb-bg-1), var(--evb-bg-2) 70%);
  color: #1f1408;
  min-height: 100vh;
  font-size: 17px;
  line-height: 1.55;
  -webkit-tap-highlight-color: transparent;
}

/* ── header ── */
.evb-hd {
  position: sticky; top: 0; z-index: 30;
  background: linear-gradient(90deg, var(--evb-amber-800), var(--evb-amber-600));
  color: #fff;
  padding: 14px 18px;
  display: flex; justify-content: space-between; align-items: center;
  box-shadow: 0 2px 12px rgba(120,53,15,.30);
}
.evb-hd-left { display: flex; align-items: center; gap: 12px; min-width: 0; }
.evb-hd h1 { font-size: 1.05rem; font-weight: 800; }
.evb-tag {
  font-size: .72rem;
  background: rgba(255,255,255,.22);
  padding: 3px 9px; border-radius: 999px;
}
.evb-back {
  font-size: .85rem; color: #fff; text-decoration: none;
  background: rgba(255,255,255,.18);
  padding: 6px 12px; border-radius: 999px; font-weight: 700;
}
.evb-back:hover { background: rgba(255,255,255,.28); }
.evb-date { font-size: .78rem; opacity: .9; white-space: nowrap; }

main {
  max-width: 760px; margin: 0 auto; padding: 22px 16px 90px;
}

/* ── tab switcher ── */
.evb-tabs {
  display: flex; gap: 0;
  background: #fff;
  border: 2px solid var(--evb-amber-300);
  border-radius: 999px;
  padding: 4px;
  max-width: 340px;
  margin: 0 auto 18px;
  box-shadow: 0 2px 8px rgba(180,83,9,.08);
}
.evb-tab {
  flex: 1; border: none; background: transparent;
  padding: 10px 18px;
  font-family: inherit; font-weight: 800; font-size: .98rem;
  color: var(--evb-amber-700);
  cursor: pointer;
  border-radius: 999px;
  transition: background .15s, color .15s;
}
.evb-tab.evb-tab-active {
  background: linear-gradient(135deg, var(--evb-amber-700), var(--evb-amber-500));
  color: #fff;
  box-shadow: 0 3px 10px rgba(180,83,9,.25);
}

/* ── flash extras (meaning/example reveal) ── */
.evb-flash-ex {
  font-size: .98rem; color: #2b1c0a;
  background: var(--evb-amber-50);
  border-left: 4px solid var(--evb-amber-500);
  padding: 10px 14px;
  border-radius: 0 12px 12px 0;
  margin-top: 12px;
  text-align: left;
  font-style: italic;
  line-height: 1.55;
}

/* ── writing screen ── */
.evb-writing-card {
  background: #fff;
  border: 2px solid var(--evb-amber-300);
  border-radius: 22px;
  padding: 22px;
  box-shadow: 0 4px 16px rgba(180,83,9,.08);
  margin-bottom: 14px;
}
.evb-w-label {
  font-size: .76rem; font-weight: 800;
  color: var(--evb-amber-700);
  letter-spacing: .6px; text-transform: uppercase;
  margin-bottom: 6px;
}
.evb-w-topic {
  font-size: 1.15rem; font-weight: 800;
  color: var(--evb-amber-900);
  line-height: 1.5; margin-bottom: 4px;
}
.evb-w-topic-ja {
  font-size: .92rem; color: var(--evb-amber-700);
  font-weight: 700; margin-bottom: 10px;
}
.evb-w-points {
  background: var(--evb-amber-50);
  border-radius: 12px;
  padding: 10px 16px 10px 32px;
  margin-bottom: 4px;
}
.evb-w-points li {
  font-size: .95rem;
  color: #2b1c0a;
  padding: 2px 0;
  font-weight: 600;
}
.evb-w-rules {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-bottom: 12px;
}
.evb-w-essay {
  width: 100%;
  border: 2px solid var(--evb-amber-200);
  border-radius: 14px;
  padding: 12px 14px;
  font-family: -apple-system, 'Segoe UI', sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  resize: vertical;
  min-height: 220px;
  background: #fffdf7;
  margin-top: 14px;
}
.evb-w-essay:focus {
  outline: 2px solid var(--evb-amber-500);
  border-color: var(--evb-amber-500);
  background: #fff;
}
.evb-w-counter {
  margin-top: 8px;
  font-weight: 800;
  font-size: .95rem;
  text-align: right;
  letter-spacing: .2px;
  transition: color .2s;
}
.evb-w-essay-readonly {
  background: #fffbeb;
  border: 1px solid var(--evb-amber-200);
  border-radius: 12px;
  padding: 12px 14px;
  font-size: .95rem;
  white-space: pre-wrap;
  line-height: 1.55;
  color: #2b1c0a;
  max-height: 360px;
  overflow-y: auto;
}

/* ── screens ── */
.evb-screen { display: none; }
.evb-screen.evb-active { display: block; animation: evb-fade .25s ease; }
@keyframes evb-fade {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ── welcome ── */
.evb-hero {
  background: #fff;
  border: 2px solid var(--evb-amber-300);
  border-radius: 22px;
  padding: 26px 22px 22px;
  text-align: center;
  box-shadow: 0 4px 16px rgba(180,83,9,.10);
  margin-bottom: 18px;
}
.evb-hero-emoji { font-size: 3rem; line-height: 1; margin-bottom: 6px; }
.evb-hero h2 {
  font-size: 1.45rem; color: var(--evb-amber-800);
  font-weight: 900; margin-bottom: 4px;
}
.evb-hero-sub {
  color: var(--evb-amber-700); font-size: .92rem;
  font-weight: 700; margin-bottom: 14px;
}
.evb-hero-stats {
  display: flex; justify-content: center; gap: 10px;
  flex-wrap: wrap; margin-bottom: 16px;
}
.evb-chip {
  background: var(--evb-amber-100);
  color: var(--evb-amber-800);
  padding: 6px 14px; border-radius: 999px;
  font-weight: 800; font-size: .85rem;
  border: 1px solid var(--evb-amber-200);
}
.evb-chip.evb-chip-warn {
  background: #fee2e2; color: #991b1b; border-color: #fecaca;
}

/* ── buttons ── */
.evb-btn {
  display: inline-block; cursor: pointer; user-select: none;
  background: linear-gradient(135deg, var(--evb-amber-700), var(--evb-amber-500));
  color: #fff; border: none; padding: 14px 26px;
  border-radius: 999px; font-weight: 800; font-size: 1.05rem;
  font-family: inherit;
  box-shadow: 0 4px 12px rgba(180,83,9,.30);
  transition: transform .12s, box-shadow .12s;
  text-decoration: none;
}
.evb-btn:hover { box-shadow: 0 6px 18px rgba(180,83,9,.40); transform: translateY(-1px); }
.evb-btn:active { transform: scale(.97); }
.evb-btn.evb-ghost {
  background: #fff; color: var(--evb-amber-800);
  border: 2px solid var(--evb-amber-300);
  box-shadow: none;
}
.evb-btn.evb-ghost:hover { background: var(--evb-amber-50); }
.evb-btn.evb-small { padding: 10px 18px; font-size: .9rem; }

.evb-btn-row {
  display: flex; gap: 10px; justify-content: center;
  flex-wrap: wrap; margin-top: 8px;
}

/* ── flash screen ── */
.evb-flash-card {
  background: #fff; border: 2px solid var(--evb-amber-300);
  border-radius: 22px; padding: 30px 22px;
  text-align: center;
  box-shadow: 0 4px 18px rgba(180,83,9,.10);
  margin-bottom: 14px;
  min-height: 280px;
  display: flex; flex-direction: column; justify-content: center;
}
.evb-flash-counter {
  color: var(--evb-amber-700); font-weight: 800;
  font-size: .85rem; letter-spacing: .4px;
  margin-bottom: 8px;
}
.evb-flash-word {
  font-size: 2.4rem; font-weight: 900;
  color: var(--evb-amber-900); line-height: 1.1;
  margin-bottom: 10px; letter-spacing: -.5px;
  word-break: break-word;
}
.evb-flash-ja {
  font-size: 1.2rem; font-weight: 800;
  color: var(--evb-amber-800);
  margin-bottom: 12px;
}
.evb-flash-def {
  font-size: .98rem; color: #57442a;
  line-height: 1.55;
  padding: 0 6px;
}
.evb-flash-cat {
  display: inline-block; margin-top: 12px;
  background: var(--evb-amber-100); color: var(--evb-amber-800);
  padding: 4px 10px; border-radius: 999px;
  font-size: .75rem; font-weight: 800;
}

/* ── quiz screen ── */
.evb-q-head {
  display: flex; justify-content: space-between; align-items: center;
  background: #fff; border: 2px solid var(--evb-amber-200);
  border-radius: 14px; padding: 10px 16px; margin-bottom: 12px;
  font-weight: 800;
}
.evb-q-progress { color: var(--evb-amber-800); font-size: .95rem; }
.evb-q-timer { color: var(--evb-amber-700); font-size: .95rem; }
.evb-q-timer.evb-low { color: var(--evb-ng); animation: evb-pulse .8s infinite; }
@keyframes evb-pulse { 50% { opacity: .55; } }

.evb-q-card {
  background: #fff; border: 2px solid var(--evb-amber-300);
  border-radius: 18px; padding: 22px 20px; margin-bottom: 14px;
  box-shadow: 0 4px 14px rgba(180,83,9,.08);
}
.evb-q-prompt {
  font-size: 1.05rem; line-height: 1.7;
  color: #2b1c0a;
}
.evb-q-prompt .evb-blank {
  display: inline-block;
  background: var(--evb-amber-100);
  color: var(--evb-amber-700);
  padding: 0 14px; min-width: 100px;
  border-bottom: 2.5px solid var(--evb-amber-600);
  border-radius: 4px;
  text-align: center; font-weight: 800;
  margin: 0 2px;
}
.evb-opts {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px;
  margin-top: 14px;
}
@media (max-width: 480px) {
  .evb-opts { grid-template-columns: 1fr; }
}
.evb-opt {
  display: block; text-align: left;
  background: #fff; color: #2b1c0a;
  border: 2px solid var(--evb-amber-200);
  border-radius: 14px; padding: 14px 16px;
  font-size: 1rem; font-weight: 700; font-family: inherit;
  cursor: pointer;
  transition: background .15s, border-color .15s, transform .12s;
}
.evb-opt:hover { background: var(--evb-amber-50); border-color: var(--evb-amber-400); }
.evb-opt:active { transform: scale(.98); }
.evb-opt.evb-correct {
  background: var(--evb-ok-bg); border-color: var(--evb-ok);
  color: var(--evb-ok); font-weight: 800;
}
.evb-opt.evb-wrong {
  background: var(--evb-ng-bg); border-color: var(--evb-ng);
  color: var(--evb-ng); font-weight: 800;
}
.evb-opt.evb-disabled { pointer-events: none; opacity: .85; }

.evb-q-extra {
  display: flex; justify-content: center; margin-top: 10px;
}
.evb-skip-btn {
  background: #fff; color: var(--evb-amber-700);
  border: 2px dashed var(--evb-amber-300);
  padding: 8px 18px; border-radius: 999px;
  font-weight: 700; font-size: .88rem; cursor: pointer;
  font-family: inherit;
}
.evb-skip-btn:hover { background: var(--evb-amber-50); }

.evb-feedback {
  margin-top: 12px; padding: 12px 14px;
  background: var(--evb-amber-50);
  border-left: 4px solid var(--evb-amber-500);
  border-radius: 0 12px 12px 0;
  font-size: .94rem; color: #44320a;
}
.evb-feedback strong { color: var(--evb-amber-800); }

/* ── result screen ── */
.evb-result {
  background: #fff; border: 2px solid var(--evb-amber-300);
  border-radius: 22px; padding: 24px 22px;
  box-shadow: 0 4px 16px rgba(180,83,9,.10);
  margin-bottom: 14px;
}
.evb-result h2 {
  color: var(--evb-amber-800); font-size: 1.4rem; font-weight: 900;
  text-align: center; margin-bottom: 14px;
}
.evb-result-grid {
  display: grid; grid-template-columns: 1fr 1fr; gap: 10px;
  margin-bottom: 16px;
}
.evb-result-stat {
  background: var(--evb-amber-50);
  border: 1px solid var(--evb-amber-200);
  border-radius: 14px; padding: 12px 10px;
  text-align: center;
}
.evb-result-stat-v {
  font-size: 1.6rem; font-weight: 900;
  color: var(--evb-amber-800); line-height: 1;
}
.evb-result-stat-l {
  font-size: .78rem; font-weight: 700;
  color: var(--evb-amber-700); margin-top: 4px;
}

.evb-section {
  background: #fff; border: 1px solid var(--evb-amber-200);
  border-radius: 14px; padding: 16px 18px; margin-bottom: 12px;
}
.evb-section h3 {
  font-size: 1rem; font-weight: 800;
  color: var(--evb-amber-800); margin-bottom: 10px;
}
.evb-weak-list { display: flex; flex-direction: column; gap: 8px; }
.evb-weak-item {
  display: flex; justify-content: space-between; align-items: center;
  background: #fef3c7; border: 1px solid var(--evb-amber-200);
  border-radius: 10px; padding: 8px 12px;
}
.evb-weak-en { font-weight: 800; color: var(--evb-amber-900); }
.evb-weak-ja { font-size: .85rem; color: var(--evb-amber-700); font-weight: 700; }
.evb-cat-list { display: flex; flex-wrap: wrap; gap: 8px; }
.evb-cat-pill {
  background: var(--evb-amber-100); color: var(--evb-amber-800);
  padding: 6px 12px; border-radius: 999px;
  font-weight: 700; font-size: .85rem;
  border: 1px solid var(--evb-amber-200);
}
.evb-cat-pill .evb-cat-count {
  background: var(--evb-amber-700); color: #fff;
  padding: 1px 6px; border-radius: 999px;
  font-size: .72rem; margin-left: 6px;
}
.evb-empty {
  text-align: center; color: var(--evb-amber-700);
  font-weight: 700; padding: 10px 0;
}

@media (max-width: 480px) {
  body { font-size: 16px; }
  .evb-hero h2 { font-size: 1.25rem; }
  .evb-flash-word { font-size: 2rem; }
  .evb-q-prompt { font-size: .98rem; }
}
@media (min-width: 768px) {
  body { font-size: 18px; }
  main { max-width: 820px; padding: 30px 22px 100px; }
}