/* =========================================================
   漢文スーパー単語 — 中華モダン × Apple的透明感 Glassmorphism
   ========================================================= */

:root{
  --jade: #2f8f6e;
  --jade-deep: #1f6b52;
  --cinnabar: #b5443a;
  --cinnabar-deep: #93332b;
  --ink: #262320;
  --ink-soft: #55504a;
  --paper: #f7f3ea;
  --paper2: #eef2ea;
  --glass-bg: rgba(255,255,255,0.58);
  --glass-bg-strong: rgba(255,255,255,0.72);
  --glass-border: rgba(255,255,255,0.45);
  --shadow-soft: 0 8px 32px rgba(80,70,50,0.10);
  --shadow-deep: 0 16px 48px rgba(60,50,30,0.16);
  --radius-lg: 26px;
  --radius-md: 18px;
  --radius-sm: 12px;
  --known-color: #2f8f6e;
  --weak-color: #b5443a;
  --unknown-color: #a89a7c;
}

*{ box-sizing: border-box; }

html,body{
  margin:0;
  padding:0;
  height:100%;
  font-family: "Zen Old Mincho","Noto Serif JP", serif;
  color: var(--ink);
  -webkit-font-smoothing: antialiased;
}

body{
  background:
    radial-gradient(circle at 12% 8%, rgba(216,236,224,0.9), transparent 45%),
    radial-gradient(circle at 88% 15%, rgba(240,225,200,0.7), transparent 40%),
    radial-gradient(circle at 50% 100%, rgba(210,232,222,0.6), transparent 55%),
    linear-gradient(160deg, #fbf8f1 0%, #f2f0e6 45%, #eaf1ea 100%);
  background-attachment: fixed;
  min-height: 100vh;
  position: relative;
}

/* 淡い格子テクスチャ（すりガラスの奥に感じる伝統模様） */
body::before{
  content:"";
  position: fixed;
  inset:0;
  pointer-events:none;
  z-index:0;
  opacity:0.5;
  background-image:
    repeating-linear-gradient(0deg, rgba(120,110,80,0.035) 0, rgba(120,110,80,0.035) 1px, transparent 1px, transparent 42px),
    repeating-linear-gradient(90deg, rgba(120,110,80,0.035) 0, rgba(120,110,80,0.035) 1px, transparent 1px, transparent 42px);
}

#app-shell{
  position: relative;
  z-index:1;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  padding-bottom: 92px;
}

.hidden{ display:none !important; }

/* ---------------- Glass base ---------------- */
.glass-panel, #site-header, #bottom-nav, .word-row, .flip-face, .quiz-card,
.quiz-choice, #jump-bar, .settings-panel{
  background: var(--glass-bg);
  backdrop-filter: blur(20px) saturate(140%);
  -webkit-backdrop-filter: blur(20px) saturate(140%);
  border: 1px solid var(--glass-border);
}

/* ---------------- Header ---------------- */
#site-header{
  position: sticky;
  top:0;
  z-index:50;
  border-left:none; border-right:none; border-top:none;
  box-shadow: 0 1px 0 rgba(120,110,80,0.08);
}
.header-inner{
  max-width: 900px;
  margin:0 auto;
  padding: 14px 20px;
  display:flex;
  align-items:center;
  justify-content: space-between;
}
.brand{ display:flex; align-items:center; gap:12px; }
.brand-mark{
  width:44px;height:44px;
  border-radius: 12px;
  display:flex;align-items:center;justify-content:center;
  font-size: 24px;
  font-weight:700;
  color:#fff;
  background: linear-gradient(145deg, var(--cinnabar), var(--cinnabar-deep));
  box-shadow: 0 6px 16px rgba(147,51,43,0.3), inset 0 1px 1px rgba(255,255,255,0.4);
  flex-shrink:0;
}
.brand-text h1{
  margin:0;
  font-size: 19px;
  letter-spacing: 0.06em;
  color: var(--ink);
  font-weight:700;
}
.brand-sub{
  margin:2px 0 0;
  font-size: 10.5px;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
  font-family: "Helvetica Neue", Arial, sans-serif;
}
.header-stat{
  display:flex; align-items:center; gap:8px;
  background: var(--glass-bg-strong);
  border:1px solid var(--glass-border);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  color: var(--jade-deep);
  font-weight:600;
  box-shadow: var(--shadow-soft);
  white-space:nowrap;
}
.header-stat i{ color: var(--cinnabar); }

/* ---------------- Main / Views ---------------- */
#main-views{
  flex:1;
  max-width: 900px;
  width:100%;
  margin: 0 auto;
  padding: 18px 16px 20px;
  position: relative;
}
.view{ animation: fadeIn 0.35s ease; }
@keyframes fadeIn{ from{opacity:0; transform: translateY(6px);} to{opacity:1; transform:none;} }

/* ================= LIST VIEW ================= */
.list-toolbar{
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  margin-bottom: 16px;
  box-shadow: var(--shadow-soft);
  display:flex;
  flex-direction:column;
  gap: 12px;
}
.search-box{
  display:flex; align-items:center; gap:10px;
  background: rgba(255,255,255,0.55);
  border: 1px solid rgba(255,255,255,0.6);
  border-radius: 999px;
  padding: 10px 16px;
}
.search-box i{ color: var(--jade); }
.search-box input{
  border:none; background:transparent; outline:none;
  flex:1;
  font-size: 15px;
  font-family: inherit;
  color: var(--ink);
}
.icon-btn{
  border:none; background:transparent; cursor:pointer;
  color: var(--ink-soft);
  padding:2px 4px;
  border-radius:6px;
}
.icon-btn:hover{ color: var(--cinnabar); }

.toolbar-toggles{
  display:flex; gap: 22px; flex-wrap: wrap;
}
.switch-row{
  display:flex; align-items:center; gap:8px;
  font-size: 13.5px;
  color: var(--ink-soft);
  cursor:pointer;
}
.switch{ position:relative; display:inline-block; width:38px; height:22px; }
.switch input{ opacity:0; width:0; height:0; }
.slider{
  position:absolute; cursor:pointer; inset:0;
  background: rgba(160,150,120,0.35);
  border-radius: 999px;
  transition: 0.25s;
}
.slider::before{
  content:""; position:absolute; height:16px; width:16px; left:3px; top:3px;
  background: #fff; border-radius:50%; transition: 0.25s;
  box-shadow: 0 1px 3px rgba(0,0,0,0.25);
}
.switch input:checked + .slider{ background: var(--jade); }
.switch input:checked + .slider::before{ transform: translateX(16px); }

.filter-chips{ display:flex; gap:8px; flex-wrap:wrap; }
.chip{
  border:1px solid rgba(120,110,80,0.25);
  background: rgba(255,255,255,0.4);
  color: var(--ink-soft);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 12.5px;
  cursor:pointer;
  transition: 0.2s;
  font-family: inherit;
}
.chip.active{
  background: linear-gradient(135deg, var(--jade), var(--jade-deep));
  color:#fff;
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(47,143,110,0.35);
}

.list-wrap{ padding-right: 26px; }
#word-list{ list-style:none; margin:0; padding:0; display:flex; flex-direction:column; gap:8px; }

.word-row{
  border-radius: var(--radius-md);
  padding: 0;
  overflow:hidden;
  box-shadow: var(--shadow-soft);
  transition: box-shadow 0.25s, transform 0.2s;
  scroll-margin-top: 90px;
}
.word-row.active-highlight{
  background: rgba(216,236,224,0.75);
  border-color: rgba(47,143,110,0.4);
  box-shadow: 0 10px 30px rgba(47,143,110,0.18);
}
.word-row-main{
  display:flex; align-items:center; gap:12px;
  padding: 14px 16px;
  cursor:pointer;
}
.word-idx{
  font-size:11px; color: var(--ink-soft); opacity:0.6; width:30px; flex-shrink:0; font-family: Arial, sans-serif;
}
.word-main-text{ flex:1; min-width:0; }
.word-term{
  font-size: 16.5px; font-weight:600; color: var(--ink);
  display:block;
}
.word-meaning-preview{
  font-size: 13px; color: var(--ink-soft);
  margin-top:3px;
  overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
  transition: filter 0.2s, opacity 0.2s;
}
.hide-meaning .word-meaning-preview{
  filter: blur(6px);
  opacity: 0.7;
  user-select:none;
}
.status-badges{ display:flex; gap:6px; flex-shrink:0; }
.status-btn{
  width:32px; height:32px;
  border-radius: 50%;
  border: 1px solid rgba(120,110,80,0.25);
  background: rgba(255,255,255,0.5);
  color: var(--ink-soft);
  cursor:pointer;
  display:flex; align-items:center; justify-content:center;
  font-size: 13px;
  transition: 0.2s;
}
.status-btn.weak-btn.on{
  background: linear-gradient(135deg, var(--cinnabar), var(--cinnabar-deep));
  color:#fff; border-color:transparent;
  box-shadow: 0 4px 10px rgba(181,68,58,0.4);
}
.status-btn.known-btn.on{
  background: linear-gradient(135deg, var(--jade), var(--jade-deep));
  color:#fff; border-color:transparent;
  box-shadow: 0 4px 10px rgba(47,143,110,0.4);
}
.chevron{
  color: var(--ink-soft);
  opacity:0.5;
  transition: transform 0.3s;
  flex-shrink:0;
}
.word-row.expanded .chevron{ transform: rotate(180deg); }

.word-detail{
  max-height:0;
  overflow:hidden;
  transition: max-height 0.4s ease, padding 0.4s ease;
  padding: 0 18px;
  border-top: 1px solid rgba(120,110,80,0.12);
}
.word-row.expanded .word-detail{
  max-height: 600px;
  padding: 14px 18px 18px;
}
.detail-grid{ display:flex; flex-direction:column; gap:10px; }
.detail-block{ font-size: 14px; line-height:1.8; }
.detail-label{
  display:inline-block;
  font-size: 11px;
  color: #fff;
  background: var(--jade);
  padding: 2px 9px;
  border-radius: 6px;
  margin-bottom:5px;
  letter-spacing: 0.05em;
}
.detail-block.cinnabar .detail-label{ background: var(--cinnabar); }
.detail-example{
  background: rgba(255,255,255,0.5);
  border-left: 3px solid var(--jade);
  padding: 10px 14px;
  border-radius: 0 10px 10px 0;
  font-size: 14px;
  line-height: 1.9;
}
.detail-category-row{
  display:flex; gap:8px; flex-wrap:wrap; margin-top:4px;
}
.tag-pill{
  font-size: 11px;
  padding: 3px 10px;
  border-radius:999px;
  background: rgba(160,150,120,0.18);
  color: var(--ink-soft);
}

.list-empty{ text-align:center; color: var(--ink-soft); padding: 40px 0; }

/* jump bar */
#jump-bar{
  position: fixed;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  z-index: 40;
  border-radius: 999px;
  padding: 10px 4px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:1px;
  box-shadow: var(--shadow-soft);
  max-height: 60vh;
  overflow:hidden;
}
.jump-item{
  font-size: 9.5px;
  color: var(--ink-soft);
  padding: 1.5px 5px;
  cursor:pointer;
  user-select:none;
  border-radius:4px;
}
.jump-item:hover, .jump-item.jump-active{ color:#fff; background: var(--cinnabar); }

/* ================= CARD VIEW ================= */
#view-card{ display:flex; flex-direction:column; align-items:center; gap: 18px; }
.card-header{
  width:100%;
  display:flex; justify-content:space-between; align-items:center;
}
.card-progress{
  font-size: 13px; color: var(--ink-soft);
  background: var(--glass-bg);
  border:1px solid var(--glass-border);
  padding: 6px 14px;
  border-radius: 999px;
}
#card-deck-select{
  font-family: inherit;
  border-radius: 999px;
  padding: 7px 14px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--ink);
  font-size: 13px;
}

.card-stage{
  width:100%;
  display:flex; align-items:center; justify-content:center; gap: 10px;
}
.stage-nav{
  width:44px;height:44px;
  border-radius:50%;
  border:1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--ink-soft);
  cursor:pointer;
  flex-shrink:0;
  box-shadow: var(--shadow-soft);
}
.stage-nav:hover{ color: var(--cinnabar); }

.flip-card-outer{
  perspective: 1400px;
  width: min(420px, 78vw);
  height: 300px;
  touch-action: pan-y;
}
.flip-card{
  position:relative;
  width:100%; height:100%;
  transform-style: preserve-3d;
  transition: transform 0.6s cubic-bezier(.4,.2,.2,1);
  cursor:pointer;
}
.flip-card.flipped{ transform: rotateY(180deg); }
.flip-card.swipe-left{ transform: translateX(-140%) rotate(-12deg) !important; opacity:0; transition: transform 0.4s ease, opacity 0.4s ease; }
.flip-card.swipe-right{ transform: translateX(140%) rotate(12deg) !important; opacity:0; transition: transform 0.4s ease, opacity 0.4s ease; }

.flip-face{
  position:absolute; inset:0;
  border-radius: var(--radius-lg);
  backface-visibility: hidden;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  padding: 26px;
  text-align:center;
  box-shadow: var(--shadow-deep);
}
.flip-front{ background: linear-gradient(160deg, rgba(255,255,255,0.75), rgba(230,240,232,0.6)); }
.flip-back{ transform: rotateY(180deg); background: linear-gradient(160deg, rgba(255,255,255,0.8), rgba(250,235,225,0.65)); overflow-y:auto; }

.face-tag{
  font-size: 11px;
  letter-spacing: 0.1em;
  color: #fff;
  background: linear-gradient(135deg, var(--cinnabar), var(--cinnabar-deep));
  padding: 4px 14px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.back-tag{ background: linear-gradient(135deg, var(--jade), var(--jade-deep)); }
.face-word{
  font-size: 30px; font-weight:700; color: var(--ink);
  margin: 0;
  line-height: 1.5;
}
.face-hint{
  margin-top: 18px;
  font-size: 11.5px;
  color: var(--ink-soft);
  opacity:0.6;
}
.face-reading{ font-size:14px; color: var(--jade-deep); margin: 2px 0 8px; font-weight:600; }
.face-meaning{ font-size: 19px; font-weight:700; color: var(--ink); margin: 0 0 10px; }
.face-kundoku{ font-size: 13.5px; color: var(--ink-soft); margin: 0 0 8px; }
.face-example{ font-size: 13px; color: var(--ink-soft); line-height:1.8; margin:0; }
.face-category{
  margin-top:10px;
  font-size: 10.5px;
  color: var(--ink-soft);
  background: rgba(160,150,120,0.18);
  padding: 3px 10px;
  border-radius: 999px;
}

.card-controls{ display:flex; gap: 14px; }
.sort-btn{
  border:none;
  border-radius: 999px;
  padding: 12px 22px;
  font-family: inherit;
  font-size: 14px;
  cursor:pointer;
  display:flex; align-items:center; gap:8px;
  box-shadow: var(--shadow-soft);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--ink);
  transition: transform 0.15s;
}
.sort-btn:active{ transform: scale(0.95); }
.weak-btn{ color: var(--cinnabar-deep); }
.known-btn{ color: var(--jade-deep); }
.flip-btn{ color: var(--ink-soft); }

/* ================= QUIZ VIEW ================= */
.quiz-intro{
  border-radius: var(--radius-lg);
  padding: 40px 28px;
  text-align:center;
  max-width: 480px;
  margin: 30px auto;
  box-shadow: var(--shadow-deep);
}
.intro-icon{ font-size: 40px; color: var(--cinnabar); margin-bottom: 14px; }
.quiz-intro h2{ margin: 0 0 8px; font-size: 22px; }
.quiz-intro p{ color: var(--ink-soft); font-size: 13.5px; line-height: 1.8; margin-bottom: 20px; }
.quiz-setting-row{
  display:flex; justify-content:space-between; align-items:center;
  margin-bottom: 14px;
  font-size: 13.5px;
}
.quiz-setting-row select{
  font-family: inherit;
  padding: 7px 12px;
  border-radius: 10px;
  border: 1px solid var(--glass-border);
  background: rgba(255,255,255,0.6);
}
.primary-btn{
  margin-top: 10px;
  border:none;
  background: linear-gradient(135deg, var(--cinnabar), var(--cinnabar-deep));
  color:#fff;
  padding: 14px 30px;
  border-radius: 999px;
  font-size: 15px;
  font-family: inherit;
  cursor:pointer;
  box-shadow: 0 10px 24px rgba(181,68,58,0.35);
  display:inline-flex; align-items:center; gap:10px;
}

.quiz-top{ max-width: 560px; margin: 0 auto 18px; }
.quiz-progress-bar{
  height: 6px;
  border-radius:999px;
  background: rgba(160,150,120,0.2);
  overflow:hidden;
}
.quiz-progress-fill{
  height:100%;
  background: linear-gradient(90deg, var(--jade), var(--cinnabar));
  width:0%;
  transition: width 0.35s ease;
}
.quiz-meta{ text-align:right; font-size:12px; color: var(--ink-soft); margin-top:6px; }

.quiz-card{
  max-width: 560px;
  margin: 0 auto 22px;
  border-radius: var(--radius-lg);
  padding: 34px 26px;
  text-align:center;
  box-shadow: var(--shadow-soft);
  transition: transform 0.15s ease;
}
.quiz-card.shake{ animation: shake 0.4s; }
@keyframes shake{
  0%,100%{ transform: translateX(0); }
  20%{ transform: translateX(-10px); }
  40%{ transform: translateX(10px); }
  60%{ transform: translateX(-6px); }
  80%{ transform: translateX(6px); }
}
.quiz-card.flash-correct{ box-shadow: 0 0 0 4px rgba(47,143,110,0.5), var(--shadow-soft); }
.quiz-question-label{
  display:block; font-size: 12px; color: var(--ink-soft); margin-bottom: 12px; letter-spacing:0.05em;
}
.quiz-question{ font-size: 21px; font-weight:700; margin:0; line-height: 1.8; }

.quiz-choices{
  max-width: 560px;
  margin: 0 auto;
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.quiz-choice{
  border-radius: var(--radius-md);
  padding: 16px 14px;
  font-family: inherit;
  font-size: 14.5px;
  cursor:pointer;
  box-shadow: var(--shadow-soft);
  transition: 0.2s;
  color: var(--ink);
}
.quiz-choice:hover{ transform: translateY(-2px); }
.quiz-choice.correct{
  background: linear-gradient(135deg, rgba(47,143,110,0.85), rgba(31,107,82,0.85));
  color:#fff;
  border-color: transparent;
}
.quiz-choice.wrong{
  background: linear-gradient(135deg, rgba(181,68,58,0.85), rgba(147,51,43,0.85));
  color:#fff;
  border-color: transparent;
}
.quiz-choice.disabled{ pointer-events:none; opacity:0.75; }

.quiz-result{
  max-width: 460px; margin: 30px auto; text-align:center; padding: 38px 26px; border-radius: var(--radius-lg);
}
.result-score{ font-size: 20px; font-weight:700; margin: 6px 0 20px; }
.result-ring-wrap{ position:relative; width:140px; height:140px; margin: 0 auto 24px; }
.result-ring{ width:100%; height:100%; transform: rotate(-90deg); }
.result-ring-text{
  position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
  font-size: 22px; font-weight:700; color: var(--jade-deep);
}
.ring-bg{ fill:none; stroke: rgba(160,150,120,0.2); stroke-width: 10; }
.ring-fg{
  fill:none; stroke: var(--jade); stroke-width: 10; stroke-linecap: round;
  transition: stroke-dashoffset 0.8s ease;
}

/* ================= STATS VIEW ================= */
.stats-grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.stats-card{
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-soft);
}
.stats-card.wide{ grid-column: 1 / -1; }
.stats-card h3{ margin: 0 0 14px; font-size: 15px; }
.ring-card{ display:flex; flex-direction:column; align-items:center; }
.progress-ring-wrap{ position:relative; width: 160px; height:160px; }
.progress-ring{ width:100%; height:100%; transform: rotate(-90deg); }
.progress-ring-center{
  position:absolute; inset:0; display:flex; flex-direction:column; align-items:center; justify-content:center;
}
.progress-ring-center span{ font-size: 24px; font-weight:700; color: var(--cinnabar-deep); }
.progress-ring-center small{ font-size: 11px; color: var(--ink-soft); margin-top:2px; }
.ring-legend{
  display:flex; gap: 16px; margin-top: 16px; font-size: 12px; color: var(--ink-soft); flex-wrap:wrap; justify-content:center;
}
.ring-legend b{ color: var(--ink); }
.dot{ display:inline-block; width:9px; height:9px; border-radius:50%; margin-right:5px; }
.dot.known{ background: var(--known-color); }
.dot.weak{ background: var(--weak-color); }
.dot.unknown{ background: var(--unknown-color); }

.bar-row{ margin-bottom: 12px; }
.bar-row-label{ display:flex; justify-content:space-between; font-size:12.5px; color: var(--ink-soft); margin-bottom:5px; }
.bar-track{ height: 8px; border-radius:999px; background: rgba(160,150,120,0.18); overflow:hidden; }
.bar-fill{ height:100%; background: linear-gradient(90deg, var(--jade), var(--cinnabar)); border-radius:999px; }

.weak-top-list{ margin:0; padding-left: 20px; }
.weak-top-list li{ font-size: 14px; padding: 6px 0; color: var(--ink); }
.weak-top-list li span{ color: var(--ink-soft); font-size:12.5px; margin-left: 6px; }

/* ================= SETTINGS VIEW ================= */
.settings-panel{
  border-radius: var(--radius-lg);
  padding: 28px;
  max-width: 640px;
  margin: 10px auto;
  box-shadow: var(--shadow-soft);
}
.settings-panel h2{ margin:0 0 6px; font-size: 20px; display:flex; align-items:center; gap:10px;}
.settings-desc{ color: var(--ink-soft); font-size: 13px; margin-bottom: 22px; }
.settings-row{
  display:flex; justify-content:space-between; align-items:center; gap:16px;
  padding: 16px 0;
  border-top: 1px solid rgba(120,110,80,0.12);
}
.settings-row:first-of-type{ border-top:none; }
.settings-row strong{ font-size: 14.5px; }
.settings-row p{ margin: 4px 0 0; font-size: 12.5px; color: var(--ink-soft); }
.info-row p{ font-size: 20px; font-weight:700; color: var(--jade-deep); }

.secondary-btn, .danger-btn{
  border:none;
  border-radius: 999px;
  padding: 10px 18px;
  font-family: inherit;
  font-size: 13px;
  cursor:pointer;
  white-space:nowrap;
  display:inline-flex; align-items:center; gap:8px;
  box-shadow: var(--shadow-soft);
}
.secondary-btn{ background: linear-gradient(135deg, var(--jade), var(--jade-deep)); color:#fff; }
.danger-btn{ background: linear-gradient(135deg, var(--cinnabar), var(--cinnabar-deep)); color:#fff; }
.file-btn{ position:relative; overflow:hidden; }
.file-btn input{ position:absolute; inset:0; opacity:0; cursor:pointer; }

.settings-toast{
  max-width: 640px; margin: 14px auto 0; text-align:center;
  background: var(--glass-bg-strong); border:1px solid var(--glass-border);
  border-radius: 999px; padding: 10px 18px; font-size: 13px; color: var(--jade-deep);
}

/* ================= BOTTOM NAV ================= */
#bottom-nav{
  position: fixed;
  bottom: 14px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 100;
  display:flex;
  gap: 4px;
  border-radius: 999px;
  padding: 8px;
  box-shadow: var(--shadow-deep);
  width: min(560px, 94vw);
}
.nav-btn{
  flex:1;
  border:none;
  background:transparent;
  display:flex; flex-direction:column; align-items:center; gap:3px;
  padding: 9px 4px;
  border-radius: 999px;
  color: var(--ink-soft);
  cursor:pointer;
  font-family: inherit;
  font-size: 10.5px;
  transition: 0.25s;
}
.nav-btn i{ font-size: 16px; }
.nav-btn.active{
  background: linear-gradient(135deg, var(--cinnabar), var(--cinnabar-deep));
  color:#fff;
  box-shadow: 0 6px 16px rgba(181,68,58,0.35);
}

/* ================= Responsive ================= */
@media (max-width: 720px){
  .stats-grid{ grid-template-columns: 1fr; }
  #jump-bar{ right:2px; padding: 6px 3px; }
  .jump-item{ font-size: 8.5px; }
  .quiz-choices{ grid-template-columns: 1fr; }
  .list-wrap{ padding-right: 22px; }
  .header-inner{ padding: 12px 14px; }
  .brand-text h1{ font-size: 16px; }
  .header-stat{ font-size: 11.5px; padding: 6px 10px; }
}