@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800;900&family=Noto+Sans+KR:wght@400;500;700&display=swap');

/* ═══════════════════════════════════════
   TOKENS — Jung PDF (Clean Monochrome + Coral)
═══════════════════════════════════════ */
:root {
  --brand:       #F4514E;
  --brand-dark:  #DB3C39;
  --brand-alpha: rgba(244, 81, 78, 0.16);
  --brand-tint:  rgba(244, 81, 78, 0.07);
  --brand-glow:  rgba(244, 81, 78, 0.22);
  --gold:        #FF8A85;
  --stripe:      linear-gradient(90deg, var(--brand) 0%, var(--gold) 100%);

  --bg:          #FFFFFF;
  --surface:     #FFFFFF;
  --surface-2:   #F4F4F5;
  --border:      #E4E4E7;
  --border-2:    #D4D4D8;
  --text:        #18181B;
  --text-2:      #52525B;
  --text-3:      #A1A1AA;

  --ok:        #16A34A;
  --ok-bg:     rgba(22, 163, 74, 0.08);
  --ok-border: rgba(22, 163, 74, 0.30);
  --err:       #E11D48;
  --err-bg:    rgba(225, 29, 72, 0.07);
  --err-border:rgba(225, 29, 72, 0.30);

  /* legacy compat — light values */
  --accent-primary:   var(--brand);
  --accent-gradient:  var(--stripe);
  --text-primary:     var(--text);
  --text-secondary:   var(--text-2);
  --text-muted:       var(--text-3);
  --bg-card:          var(--surface);
  --glass-border:     var(--border);
  --glass-shadow:     0 4px 20px rgba(24, 24, 27, 0.06);
  --radius-md:        8px;
  --radius-lg:        12px;

  --r-1: 6px;
  --r-2: 8px;
  --r-3: 10px;
  --r-4: 12px;
  --r-5: 14px;

  --sh-1: 0 1px 2px rgba(24,24,27,.04);
  --sh-2: 0 2px 8px rgba(24,24,27,.06);
  --sh-3: 0 6px 18px rgba(24,24,27,.08);
  --sh-4: 0 10px 30px rgba(24,24,27,.08);

  --ease:     cubic-bezier(.4, 0, .2, 1);
  --ease-out: cubic-bezier(.16, 1, .3, 1);
  --t1: 140ms;
  --t2: 210ms;
}

/* ─── BASE ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: 'Inter', 'Noto Sans KR', system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  background: var(--surface-2);
  color: var(--text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 0 16px 64px;
  overflow-x: hidden;
}

.stars, .star { display: none !important; }

/* ─── HERO ─── */
.hero {
  width: 100%;
  max-width: 640px;
  margin: 28px 0 20px;
  padding: 40px 36px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-5);
  box-shadow: var(--sh-3);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
  background: var(--brand);
}

.hero::after { content: none; }

.hero-icon,
.hero-moon {
  font-size: 2.6rem;
  display: inline-block;
  margin-bottom: 14px;
}

.hero h1 {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.04em;
  line-height: 1.15;
}

/* ─── FEATURE GRID — left-border accent cards ─── */
.feature-grid {
  width: 100%;
  max-width: 640px;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-bottom: 8px;
}

.feature-card:last-child:nth-child(odd) { grid-column: span 2; }

.feature-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 3px solid var(--brand);
  border-radius: 0 var(--r-3) var(--r-3) 0;
  padding: 18px 16px 18px 18px;
  display: flex;
  flex-direction: column;
  transition:
    background var(--t1) var(--ease),
    border-color var(--t1) var(--ease),
    box-shadow var(--t2) var(--ease-out);
}

.feature-card:hover {
  background: var(--surface-2);
  border-left-color: var(--gold);
  box-shadow: var(--sh-2);
}

.feature-icon {
  font-size: 1.4rem;
  display: block;
  margin-bottom: 8px;
}

.feature-title {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.01em;
  margin-bottom: 3px;
}

.feature-desc {
  font-size: 0.73rem;
  color: var(--text-3);
  line-height: 1.5;
  margin-bottom: 12px;
  flex: 1;
}

.card-actions { display: flex; flex-direction: column; gap: 5px; }

.btn-link {
  display: block;
  padding: 7px 10px;
  border-radius: var(--r-1);
  text-decoration: none;
  font-size: 0.77rem;
  font-weight: 600;
  text-align: center;
  background: transparent;
  border: 1px solid var(--border-2);
  color: var(--text-2);
  transition: all var(--t1) var(--ease);
}
.btn-link:hover {
  border-color: var(--brand);
  color: var(--brand);
  background: var(--brand-tint);
}
.btn-link.primary {
  background: var(--brand);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 2px 10px var(--brand-glow);
}
.btn-link.primary:hover {
  background: var(--brand-dark);
  box-shadow: 0 4px 16px var(--brand-glow);
}

/* ─── TITLE BAR ─── */
.title-bar {
  width: 100%;
  max-width: 640px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0 10px;
}
.title-bar__home {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  text-decoration: none;
  color: var(--text-3);
  font-size: 0.82rem;
  font-weight: 500;
  transition: color var(--t1) var(--ease);
}
.title-bar__home:hover { color: var(--text-2); }
.title-bar__cat {
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--brand);
  background: var(--brand-tint);
  border: 1px solid var(--brand-alpha);
  padding: 3px 10px;
  border-radius: var(--r-1);
}

/* ─── PAGE CONTAINER ─── */
.page-container {
  width: 100%;
  max-width: 640px;
  display: flex;
  flex-direction: column;
}
.page-header { text-align: center; margin-bottom: 18px; }
.page-title {
  font-size: 1.3rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.03em;
  margin-bottom: 4px;
}
.page-sub { font-size: 0.82rem; color: var(--text-3); }

/* ─── SUBNAV ─── */
.subnav {
  display: flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-2);
  padding: 4px;
  gap: 3px;
  margin-bottom: 16px;
  box-shadow: var(--sh-1);
}
.subnav-btn {
  flex: 1;
  padding: 9px 6px;
  border-radius: calc(var(--r-2) - 2px);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 600;
  text-align: center;
  background: transparent;
  border: none;
  color: var(--text-2);
  cursor: pointer;
  transition: color var(--t1) var(--ease), background var(--t1) var(--ease);
}
.subnav-btn:hover { color: var(--text); background: var(--surface-2); }
.subnav-btn.active {
  background: var(--brand);
  color: #fff;
  box-shadow: 0 2px 8px var(--brand-glow);
  pointer-events: none;
}

/* ─── SETTINGS FORM ─── */
.settings-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-4);
  padding: 24px;
  margin-bottom: 12px;
  box-shadow: var(--sh-2);
}
.settings-form fieldset { border: none; padding: 0; margin-bottom: 20px; }
.settings-form fieldset:last-of-type { margin-bottom: 0; }
.settings-form legend {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 10px;
}
.scroll-group { display: flex; gap: 6px; flex-wrap: wrap; }
.scroll-group input[type="radio"] { display: none; }
.scroll-group label {
  padding: 6px 14px;
  border-radius: var(--r-1);
  background: transparent;
  border: 1px solid var(--border-2);
  color: var(--text-2);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  white-space: nowrap;
  transition: all var(--t1) var(--ease);
}
.scroll-group label:hover { border-color: var(--brand); color: var(--brand); }
.scroll-group input[type="radio"]:checked + label {
  background: var(--brand);
  border-color: transparent;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 2px 8px var(--brand-glow);
}
.scroll-group label.tbd { opacity: 0.35; cursor: not-allowed; }

.start-button {
  width: 100%;
  padding: 13px;
  font-family: 'Inter', 'Noto Sans KR', sans-serif;
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: #fff;
  background: var(--brand);
  border: none;
  border-radius: var(--r-2);
  cursor: pointer;
  box-shadow: 0 4px 14px var(--brand-glow);
  margin-top: 20px;
  transition: all var(--t1) var(--ease);
}
.start-button:hover {
  background: var(--brand-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 18px var(--brand-glow);
}

/* ─── QUIZ ─── */
.quiz-container {
  width: 100%;
  max-width: 600px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-4);
  padding: 32px;
  text-align: center;
  margin-top: 16px;
  box-shadow: var(--sh-2);
}
.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--surface-2);
  border-radius: 99px;
  overflow: hidden;
  margin-bottom: 6px;
}
.progress-bar-inner {
  height: 100%;
  width: 0%;
  background: var(--brand);
  border-radius: 99px;
  transition: width 0.4s var(--ease);
}
.progress-text { font-size: 0.78rem; font-weight: 600; color: var(--text-3); letter-spacing: 0.02em; margin-bottom: 28px; }

.question-display {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.03em;
  min-height: 150px;
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 1;
  transition: opacity 0.25s;
  cursor: pointer;
  text-align: center;
  word-break: break-word;
  line-height: 1.3;
  padding: 12px 0;
}
.question-display.fade-out { opacity: 0; }
.question-display.show-answer {
  font-family: 'Noto Sans KR', sans-serif;
  font-size: 2.2rem;
  color: var(--brand);
  letter-spacing: -0.01em;
}

.answer-input {
  width: 100%;
  max-width: 340px;
  padding: 12px 18px;
  font-family: 'Inter', 'Noto Sans KR', sans-serif;
  font-size: 1.1rem;
  font-weight: 500;
  text-align: center;
  background: var(--bg);
  border: 1.5px solid var(--border-2);
  border-radius: var(--r-2);
  color: var(--text);
  outline: none;
  transition: all var(--t1) var(--ease);
}
.answer-input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-alpha);
}
.answer-input::placeholder { color: var(--text-3); }

.button-container { display: flex; gap: 8px; margin-top: 24px; }
.quiz-nav-button {
  flex: 1;
  padding: 11px 16px;
  border-radius: var(--r-2);
  font-family: 'Inter', 'Noto Sans KR', sans-serif;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  border: 1.5px solid transparent;
  text-align: center;
  text-decoration: none;
  background: var(--brand);
  color: #fff;
  box-shadow: 0 2px 10px var(--brand-glow);
  transition: all var(--t1) var(--ease);
}
.quiz-nav-button:hover { background: var(--brand-dark); transform: translateY(-1px); }
.quiz-nav-button.secondary {
  background: transparent;
  border-color: var(--border-2);
  color: var(--text-2);
  box-shadow: none;
}
.quiz-nav-button.secondary:hover {
  border-color: var(--brand);
  color: var(--brand);
  background: var(--brand-tint);
  transform: none;
}

.feedback-correct   { animation: flash-correct  0.4s; }
.feedback-incorrect { animation: flash-incorrect 0.4s; }
@keyframes flash-correct   { 50% { background: var(--ok-bg);  border-color: var(--ok-border); } }
@keyframes flash-incorrect { 50% { background: var(--err-bg); border-color: var(--err-border); } }

/* ─── RESULT ─── */
.result-container {
  width: 100%;
  max-width: 780px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-4);
  padding: 32px;
  text-align: center;
  box-shadow: var(--sh-2);
}
.result-container h1 { font-size: 1.4rem; font-weight: 800; color: var(--text); letter-spacing: -0.03em; margin-bottom: 4px; }

.score {
  font-size: 3rem;
  font-weight: 900;
  letter-spacing: -0.05em;
  color: var(--brand);
  margin: 14px 0;
}

.legend { display: flex; justify-content: center; gap: 18px; margin-bottom: 22px; flex-wrap: wrap; }
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 0.82rem; color: var(--text-2); }
.legend-color { width: 10px; height: 10px; border-radius: 2px; }

.chart-container { margin-top: 18px; }
.chart-container h3 {
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-align: center;
  padding-bottom: 8px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.word-result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(100px, 1fr));
  gap: 6px;
  margin-bottom: 24px;
}
.word-cell {
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 50px;
  padding: 9px 7px;
  border-radius: var(--r-1);
  font-size: 0.85rem;
  font-weight: 600;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text);
  cursor: pointer;
  text-align: center;
  word-break: break-word;
  line-height: 1.3;
  transition: all var(--t1) var(--ease);
  user-select: none;
}
.word-cell:hover { border-color: var(--brand); transform: translateY(-1px); }
.word-cell.correct   { background: var(--ok-bg);  border-color: var(--ok-border); color: var(--ok); }
.word-cell.incorrect { background: var(--err-bg); border-color: var(--err-border); color: var(--err); }
.word-cell.not-asked { opacity: 0.35; }
.word-cell.show-kr   { font-family: 'Noto Sans KR', sans-serif; font-size: 0.78rem; color: var(--brand); }
.word-cell.fade-out  { opacity: 0; transition: opacity 0.3s; }

.retry-button {
  display: block;
  width: 100%;
  padding: 14px;
  font-family: 'Inter', 'Noto Sans KR', sans-serif;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  background: var(--brand);
  border: none;
  border-radius: var(--r-2);
  text-decoration: none;
  cursor: pointer;
  box-shadow: 0 4px 14px var(--brand-glow);
  margin-top: 24px;
  transition: all var(--t1) var(--ease);
}
.retry-button:hover { background: var(--brand-dark); transform: translateY(-2px); box-shadow: 0 8px 20px var(--brand-glow); }

/* ─── AD ─── */
.ad-grid { display: grid; grid-template-columns: repeat(2, 320px); gap: 12px; justify-content: center; margin-top: 24px; }
.ad-cell { width: 320px; min-height: 50px; }
.ad-mobile-container-320-50-center  { display: block; width: 320px; min-height: 50px; }
.ad-mobile-container-320-100-center { display: block; width: 320px; min-height: 100px; }
.ag-ad-area { width: 320px; }
@media (max-width: 720px) { .ad-grid { grid-template-columns: 320px; } }

/* ─── FLASHCARD ─── */
.fc-wrapper { perspective: 1000px; width: 100%; max-width: 460px; margin: 0 auto 14px; }
.fc-card {
  position: relative;
  width: 100%;
  padding-top: 60%;
  transform-style: preserve-3d;
  transition: transform 0.42s var(--ease);
  cursor: pointer;
}
.fc-card.flipped { transform: rotateY(180deg); }
.fc-front,
.fc-back {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 8px;
  border-radius: var(--r-4);
  background: var(--surface);
  border: 1px solid var(--border);
  box-shadow: var(--sh-2);
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  padding: 20px;
  text-align: center;
}
.fc-back {
  transform: rotateY(180deg);
  border-left: 3px solid var(--brand);
  background: var(--surface-2);
}
.fc-counter  { position: absolute; top: 12px; right: 14px; font-size: 0.72rem; font-weight: 600; color: var(--text-3); }
.fc-word     { font-size: 1.9rem; font-weight: 800; color: var(--text); word-break: break-word; line-height: 1.3; letter-spacing: -0.03em; }
.fc-meaning  { font-family: 'Noto Sans KR', sans-serif; font-size: 1.5rem; font-weight: 700; color: var(--brand); word-break: break-word; line-height: 1.3; }
.fc-tap-hint { font-size: 0.72rem; color: var(--text-3); margin-top: 4px; }

.fc-progress-wrap { width: 100%; max-width: 460px; margin: 0 auto 10px; }
.fc-progress-bar  { width: 100%; height: 4px; background: var(--surface-2); border-radius: 99px; overflow: hidden; }
.fc-progress-inner { height: 100%; background: var(--brand); border-radius: 99px; transition: width 0.35s; }

.fc-nav { display: flex; gap: 6px; width: 100%; max-width: 460px; margin: 0 auto 14px; }
.fc-nav-btn {
  flex: 1;
  padding: 9px 10px;
  border-radius: var(--r-2);
  background: var(--surface);
  border: 1px solid var(--border-2);
  color: var(--text-2);
  font-family: 'Inter', 'Noto Sans KR', sans-serif;
  font-size: 0.84rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t1) var(--ease);
}
.fc-nav-btn:hover { border-color: var(--brand); color: var(--brand); }

.fc-control-bar {
  display: flex;
  align-items: stretch;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  max-width: 460px;
  margin: 0 auto;
  padding: 6px 10px;
  background: var(--surface);
  border-radius: var(--r-2);
  border: 1px solid var(--border);
}
.fc-play-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--text-2);
  border-radius: var(--r-1);
  font-size: 0.85rem;
  transition: all var(--t1) var(--ease);
}
.fc-play-btn:hover { background: var(--surface-2); color: var(--brand); }
.fc-divider { width: 1px; background: var(--border); margin: 4px 0; }
.fc-speed-group { display: flex; gap: 4px; align-items: center; }
.speed-btn {
  padding: 4px 9px;
  border-radius: var(--r-1);
  background: transparent;
  border: 1px solid var(--border-2);
  color: var(--text-3);
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t1) var(--ease);
}
.speed-btn:hover { border-color: var(--brand); color: var(--brand); }
.speed-btn.active { background: var(--brand); border-color: transparent; color: #fff; }

/* ─── WORDBOOK ─── */
.layout-controls { display: flex; gap: 6px; margin-bottom: 10px; }
.layout-btn {
  padding: 7px 12px;
  border-radius: var(--r-1);
  background: var(--surface);
  border: 1px solid var(--border-2);
  color: var(--text-2);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--t1) var(--ease);
}
.layout-btn:hover { border-color: var(--brand); color: var(--brand); }
.layout-btn.active { background: var(--brand); border-color: transparent; color: #fff; }

.wordbook-list { display: grid; gap: 4px; width: 100%; }
.wordbook-list.cols-1 { grid-template-columns: 1fr; }
.wordbook-list.cols-3 { grid-template-columns: repeat(3, 1fr); }
.wordbook-list.cols-5 { grid-template-columns: repeat(5, 1fr); }

.wb-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border-radius: var(--r-1);
  background: var(--surface);
  border: 1px solid var(--border);
  border-left: 2px solid var(--border-2);
  cursor: pointer;
  min-height: 38px;
  transition: all var(--t1) var(--ease);
}
.wb-row:hover { border-left-color: var(--brand); background: var(--surface-2); }

.cols-3 .wb-row,
.cols-5 .wb-row {
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 3px;
  padding: 8px 6px;
  border-left: none;
  border-top: 2px solid var(--border-2);
}
.cols-3 .wb-row:hover,
.cols-5 .wb-row:hover { border-top-color: var(--brand); border-left: none; }

.wb-idx { font-size: 0.68rem; color: var(--text-3); min-width: 20px; }
.cols-3 .wb-idx, .cols-5 .wb-idx { font-size: 0.64rem; min-width: auto; }
.wb-en { font-size: 0.92rem; font-weight: 600; color: var(--text); flex: 1; word-break: break-word; }
.cols-3 .wb-en, .cols-5 .wb-en { font-size: 0.82rem; flex: none; }
.wb-kr { font-family: 'Noto Sans KR', sans-serif; font-size: 0.84rem; color: var(--brand); font-weight: 500; }
.cols-3 .wb-kr, .cols-5 .wb-kr { font-size: 0.74rem; }
.wb-hidden { visibility: hidden; height: 0; overflow: hidden; padding: 0; margin: 0; }
.cols-3 .wb-hidden, .cols-5 .wb-hidden { display: none; }

/* ═══════════════════════════════════════
   CALCULATOR / FORM — Jung PDF 전용 컴포넌트
═══════════════════════════════════════ */
.calc-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-4);
  padding: 24px;
  margin-bottom: 14px;
  box-shadow: var(--sh-2);
}
.calc-field { margin-bottom: 16px; }
.calc-field:last-child { margin-bottom: 0; }
.calc-label {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 7px;
  letter-spacing: -0.01em;
}
.calc-label .hint { color: var(--text-3); font-weight: 400; font-size: 0.74rem; }

.calc-input-wrap { position: relative; display: flex; align-items: center; }
.calc-input {
  width: 100%;
  padding: 12px 16px;
  font-family: 'Inter', 'Noto Sans KR', sans-serif;
  font-size: 1.05rem;
  font-weight: 600;
  text-align: left;
  background: var(--bg);
  border: 1.5px solid var(--border-2);
  border-radius: var(--r-2);
  color: var(--text);
  outline: none;
  transition: all var(--t1) var(--ease);
}
.calc-input:focus { border-color: var(--brand); box-shadow: 0 0 0 3px var(--brand-alpha); }
.calc-input::placeholder { color: var(--text-3); font-weight: 400; }
.calc-input.has-suffix { padding-right: 46px; }
.calc-suffix {
  position: absolute;
  right: 16px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-3);
  pointer-events: none;
}

/* segmented radio */
.calc-seg { display: flex; gap: 6px; flex-wrap: wrap; }
.calc-seg input[type="radio"] { display: none; }
.calc-seg label {
  flex: 1;
  min-width: 64px;
  padding: 9px 12px;
  text-align: center;
  border-radius: var(--r-1);
  background: transparent;
  border: 1px solid var(--border-2);
  color: var(--text-2);
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--t1) var(--ease);
}
.calc-seg label:hover { border-color: var(--brand); color: var(--brand); }
.calc-seg input[type="radio"]:checked + label {
  background: var(--brand);
  border-color: transparent;
  color: #fff;
  font-weight: 600;
  box-shadow: 0 2px 8px var(--brand-glow);
}

/* 결과 박스 */
.calc-result {
  background: var(--surface);
  border: 1px solid var(--border);
  border-top: 3px solid var(--brand);
  border-radius: var(--r-4);
  padding: 26px 24px;
  margin-bottom: 14px;
  box-shadow: var(--sh-2);
}
.result-label {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-align: center;
  margin-bottom: 8px;
}
.result-main {
  font-size: 2.4rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  text-align: center;
  color: var(--brand);
  line-height: 1.15;
  word-break: keep-all;
}
.result-main .unit {
  color: var(--text-2);
  font-size: 1.1rem;
  font-weight: 700;
  margin-left: 4px;
}
.result-sub { text-align: center; font-size: 0.82rem; color: var(--text-3); margin-top: 6px; }

.result-rows { margin-top: 22px; border-top: 1px solid var(--border); }
.result-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 11px 2px;
  border-bottom: 1px solid var(--border);
  font-size: 0.88rem;
}
.result-row .rk { color: var(--text-2); }
.result-row .rv { color: var(--text); font-weight: 600; font-variant-numeric: tabular-nums; }
.result-row.minus .rv { color: var(--err); }
.result-row.total { padding-top: 14px; border-bottom: none; }
.result-row.total .rk { font-weight: 700; color: var(--text); }
.result-row.total .rv { font-weight: 800; font-size: 1.05rem; color: var(--brand); }

.calc-note {
  font-size: 0.74rem;
  color: var(--text-2);
  line-height: 1.6;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--r-2);
  padding: 14px 16px;
  margin-bottom: 14px;
}
.calc-note b { color: var(--text); font-weight: 700; }

/* ─── GLASS CARD (legacy) ─── */
.glass-card {
  width: 100%;
  max-width: 600px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-4);
  padding: 32px;
  box-shadow: var(--sh-2);
}

/* ─── FOOTER ─── */
.site-footer {
  width: 100%;
  max-width: 900px;
  margin-top: 28px;
  padding: 18px 16px;
  border-top: 1px solid var(--border);
  text-align: center;
}
.site-footer a { color: var(--text-3); font-size: 0.8rem; text-decoration: none; transition: color var(--t1) var(--ease); }
.site-footer a:hover { color: var(--brand); }
.footer-divider { color: var(--border-2); margin: 0 8px; }

/* ─── RESPONSIVE ─── */
@media (max-width: 600px) {
  .feature-grid { grid-template-columns: 1fr; }
  .feature-card:last-child:nth-child(odd) { grid-column: span 1; }
}
@media (max-width: 480px) {
  body { padding: 0 12px 64px; }
  .hero { padding: 32px 24px; border-radius: var(--r-4); }
  .hero h1 { font-size: 1.5rem; }
  .quiz-container, .result-container { padding: 22px 14px; }
  .question-display { font-size: 2.2rem; min-height: 130px; }
  .question-display.show-answer { font-size: 1.8rem; }
  .score { font-size: 2.4rem; }
  .fc-word { font-size: 1.6rem; }
  .fc-meaning { font-size: 1.3rem; }
  .wordbook-list.cols-5 { grid-template-columns: repeat(3, 1fr); }
  .word-result-grid { grid-template-columns: repeat(auto-fill, minmax(80px, 1fr)); }
  .settings-form { padding: 20px 14px; }
}