/* ==========================================================================
   体系英単語 — Apple風 Glassmorphism デザインシステム
   ========================================================================== */

:root{
  --bg-0:#FBFBFD;
  --bg-1:#F2F3F6;
  --glass-bg: rgba(255,255,255,0.60);
  --glass-bg-strong: rgba(255,255,255,0.78);
  --glass-border: rgba(255,255,255,0.35);
  --glass-shadow: 0 8px 32px rgba(31,38,53,0.08);
  --ink-1:#1D1D1F;
  --ink-2:#3A3A3C;
  --ink-3:#6E6E73;
  --ink-4:#A1A1A6;
  --accent:#0A84FF;
  --accent-2:#5E5CE6;
  --green:#30D158;
  --orange:#FF9F0A;
  --red:#FF453A;
  --radius-lg:28px;
  --radius-md:20px;
  --radius-sm:14px;
  --nav-h:84px;
  --header-h:64px;
  font-size:16px;
}

*{box-sizing:border-box;}
html,body{
  margin:0; padding:0; height:100%;
  color:var(--ink-1);
  font-family:'Inter','Noto Sans JP',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  -webkit-font-smoothing:antialiased;
  background:
    radial-gradient(circle at 15% 0%, rgba(94,92,230,0.06), transparent 45%),
    radial-gradient(circle at 85% 10%, rgba(10,132,255,0.07), transparent 40%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1));
  overflow-x:hidden;
}
button{font-family:inherit;}
input,select{font-family:inherit;}
ul,ol{list-style:none;margin:0;padding:0;}
a{color:inherit;text-decoration:none;}

.glass-panel{
  background:var(--glass-bg);
  -webkit-backdrop-filter:blur(24px) saturate(180%);
  backdrop-filter:blur(24px) saturate(180%);
  border:1px solid var(--glass-border);
  box-shadow:var(--glass-shadow);
}

/* ============================== ヘッダー ============================== */
#app-header{
  position:fixed; top:0; left:0; right:0; z-index:50;
  height:var(--header-h);
  border-radius:0 0 24px 24px;
  border-top:none;
}
.header-inner{
  max-width:900px; margin:0 auto; height:100%;
  display:flex; align-items:center; justify-content:space-between;
  padding:0 20px;
}
.brand{display:flex; align-items:center; gap:10px;}
.brand-mark{
  width:34px; height:34px; border-radius:10px;
  display:flex; align-items:center; justify-content:center;
  background:linear-gradient(135deg, var(--accent), var(--accent-2));
  color:#fff; font-size:15px;
  box-shadow:0 4px 14px rgba(94,92,230,0.35);
}
.brand-title{
  font-size:19px; font-weight:700; letter-spacing:-0.02em; margin:0;
}
.header-progress{display:flex;align-items:center;}
.mini-ring{position:relative; width:36px; height:36px;}
.mini-ring svg{width:100%;height:100%;transform:rotate(-90deg);}
.mini-ring .ring-bg{fill:none;stroke:rgba(0,0,0,0.08);stroke-width:4;}
.mini-ring .ring-fg{fill:none;stroke:var(--accent);stroke-width:4;stroke-linecap:round;stroke-dasharray:100.5;stroke-dashoffset:100.5;transition:stroke-dashoffset .6s ease;}
.mini-ring-label{
  position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
  font-size:9px; font-weight:700; color:var(--ink-2);
}

/* ============================== メイン ============================== */
#app-main{
  padding-top:calc(var(--header-h) + 14px);
  padding-bottom:calc(var(--nav-h) + 18px);
  min-height:100vh;
}
.view{display:none;}
.view.active{display:block; animation:fadeIn .35s ease;}
@keyframes fadeIn{from{opacity:0; transform:translateY(6px);} to{opacity:1; transform:translateY(0);}}
.view-inner{max-width:900px; margin:0 auto; padding:0 16px;}

/* ============================== 一覧モード ============================== */
.list-toolbar{
  border-radius:var(--radius-lg);
  padding:16px 18px;
  margin-bottom:16px;
  position:sticky; top:calc(var(--header-h) + 8px); z-index:20;
}
.search-wrap{
  position:relative; display:flex; align-items:center;
  background:rgba(255,255,255,0.55);
  border:1px solid rgba(255,255,255,0.5);
  border-radius:14px; padding:10px 14px; margin-bottom:14px;
}
.search-icon{color:var(--ink-4); margin-right:8px; font-size:14px;}
#search-input{
  flex:1; border:none; background:transparent; outline:none;
  font-size:16px; color:var(--ink-1);
}
#search-input::placeholder{color:var(--ink-4);}
.search-count{font-size:12px; color:var(--ink-4); white-space:nowrap;}

.toggle-row{display:flex; flex-wrap:wrap; align-items:center; gap:16px 22px;}
.switch-label{display:flex; align-items:center; gap:10px; font-size:13.5px; color:var(--ink-2); font-weight:500; cursor:pointer;}
.switch-label.full{width:100%; justify-content:space-between;}
.switch{position:relative; display:inline-block;}
.switch input{position:absolute; opacity:0; width:0; height:0;}
.switch-track{
  display:block; width:44px; height:26px; border-radius:14px;
  background:rgba(120,120,128,0.24);
  transition:background .25s ease; position:relative;
}
.switch-thumb{
  position:absolute; top:2px; left:2px; width:22px; height:22px; border-radius:50%;
  background:#fff; box-shadow:0 2px 4px rgba(0,0,0,0.25);
  transition:transform .25s ease;
}
.switch input:checked + .switch-track{background:var(--green);}
.switch input:checked + .switch-track .switch-thumb{transform:translateX(18px);}

.filter-chips{display:flex; gap:8px; flex-wrap:wrap;}
.chip{
  border:1px solid rgba(0,0,0,0.08); background:rgba(255,255,255,0.5);
  border-radius:999px; padding:7px 14px; font-size:12.5px; font-weight:600;
  color:var(--ink-3); cursor:pointer; transition:all .2s ease;
}
.chip.active{background:var(--ink-1); color:#fff; border-color:var(--ink-1);}
.chip:hover{transform:translateY(-1px);}

.list-stage{position:relative; display:flex;}
.virtual-list{
  flex:1; height:calc(100vh - var(--header-h) - var(--nav-h) - 190px);
  min-height:400px;
  overflow-y:auto; position:relative;
  border-radius:var(--radius-lg);
  padding-right:6px;
}
.virtual-spacer{position:relative; width:100%;}

.word-row{
  position:relative;
  margin-bottom:8px;
  border-radius:var(--radius-md);
  background:var(--glass-bg);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  border:1px solid var(--glass-border);
  overflow:hidden;
  transition:background .25s ease, box-shadow .25s ease;
}
.word-row.selected{background:rgba(10,132,255,0.10); border-color:rgba(10,132,255,0.25);}
.word-row-main{
  display:flex; align-items:center; gap:14px;
  padding:14px 16px; cursor:pointer;
}
.word-no{
  font-size:11px; color:var(--ink-4); font-weight:600; width:34px; flex-shrink:0;
}
.word-headword{flex:0 0 auto; min-width:120px;}
.word-headword .en{font-size:17px; font-weight:700; letter-spacing:-0.01em;}
.word-headword .pos{font-size:10px; color:var(--accent); font-weight:700; margin-left:6px; vertical-align:middle;}
.word-meaning{
  flex:1; font-size:14px; color:var(--ink-2); white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
  transition:filter .2s ease, opacity .2s ease;
}
.word-meaning.masked{filter:blur(6px); opacity:.6; user-select:none;}
.word-status-actions{display:flex; gap:6px; flex-shrink:0;}
.mini-btn{
  width:34px; height:34px; border-radius:10px; border:none; cursor:pointer;
  display:flex; align-items:center; justify-content:center; font-size:13px;
  background:rgba(120,120,128,0.10); color:var(--ink-4); transition:all .2s ease;
}
.mini-btn:hover{transform:scale(1.08);}
.mini-btn.learned.on{background:var(--green); color:#fff;}
.mini-btn.difficult.on{background:var(--orange); color:#fff;}
.expand-chevron{color:var(--ink-4); font-size:13px; padding:0 4px; transition:transform .25s ease;}
.word-row.expanded .expand-chevron{transform:rotate(180deg); color:var(--accent);}

.word-detail{
  max-height:0; overflow:hidden; transition:max-height .35s ease;
}
.word-row.expanded .word-detail{max-height:500px;}
.word-detail-inner{
  padding:0 20px 20px 20px;
  border-top:1px solid rgba(0,0,0,0.05);
  margin-top:2px;
  display:flex; flex-direction:column; gap:12px;
}
.detail-block{
  background:rgba(255,255,255,0.5);
  border-radius:14px; padding:12px 14px;
  border:1px solid rgba(255,255,255,0.4);
}
.detail-label{font-size:10.5px; font-weight:700; color:var(--accent); text-transform:uppercase; letter-spacing:.06em; margin-bottom:4px;}
.detail-text{font-size:14px; color:var(--ink-1); line-height:1.6;}
.detail-example{font-style:italic; color:var(--ink-2);}
.detail-actions{display:flex; gap:10px; padding-top:4px;}
.speak-btn{
  border:none; background:rgba(10,132,255,0.1); color:var(--accent);
  border-radius:10px; padding:8px 14px; font-size:12.5px; font-weight:600; cursor:pointer;
  display:flex; align-items:center; gap:6px;
}
.speak-btn:hover{background:rgba(10,132,255,0.18);}

.az-index{
  width:28px; display:flex; flex-direction:column; align-items:center; justify-content:center;
  gap:1px; padding:8px 2px; margin-left:6px; border-radius:16px;
  background:rgba(255,255,255,0.4); align-self:stretch;
  -webkit-backdrop-filter:blur(10px); backdrop-filter:blur(10px);
}
.az-index button{
  border:none; background:transparent; font-size:10px; font-weight:700; color:var(--ink-4);
  cursor:pointer; padding:2px 0; width:100%; border-radius:6px;
}
.az-index button:hover, .az-index button.active{color:var(--accent); background:rgba(10,132,255,0.08);}

/* ============================== カードモード ============================== */
.cards-inner{display:flex; flex-direction:column; height:calc(100vh - var(--header-h) - var(--nav-h) - 20px);}
.cards-header{
  border-radius:var(--radius-md); padding:12px 18px; margin-bottom:14px;
  display:flex; align-items:center; justify-content:space-between;
}
#cards-progress-label{font-size:13px; font-weight:700; color:var(--ink-3);}
.ghost-btn{
  border:1px solid rgba(0,0,0,0.08); background:rgba(255,255,255,0.5);
  border-radius:12px; padding:8px 14px; font-size:13px; font-weight:600; color:var(--ink-2);
  cursor:pointer; display:inline-flex; align-items:center; gap:6px;
}
.ghost-btn:hover{background:rgba(255,255,255,0.8);}
.ghost-select{
  border:1px solid rgba(0,0,0,0.08); background:rgba(255,255,255,0.5);
  border-radius:12px; padding:8px 10px; font-size:13px; font-weight:600; color:var(--ink-2);
}
.card-stage{
  flex:1; position:relative; display:flex; align-items:center; justify-content:center;
  perspective:1600px; min-height:300px;
}
.empty-hint{color:var(--ink-4); font-size:14px;}
.flash-card{
  position:absolute; width:min(88%, 380px); height:min(58vh, 460px);
  border-radius:32px; cursor:pointer;
  transform-style:preserve-3d; transition:transform .18s ease, opacity .18s ease;
  touch-action:none;
}
.flash-card.flipped .card-face-inner{transform:rotateY(180deg);}
.card-face-inner{
  position:relative; width:100%; height:100%;
  transition:transform .5s cubic-bezier(.4,.2,.2,1);
  transform-style:preserve-3d;
}
.card-face{
  position:absolute; inset:0; border-radius:32px;
  display:flex; flex-direction:column; align-items:center; justify-content:center;
  padding:30px; text-align:center;
  backface-visibility:hidden;
  background:var(--glass-bg-strong);
  -webkit-backdrop-filter:blur(28px) saturate(180%);
  backdrop-filter:blur(28px) saturate(180%);
  border:1px solid var(--glass-border);
  box-shadow:0 20px 60px rgba(31,38,53,0.14);
}
.card-face.back{transform:rotateY(180deg); gap:14px; overflow-y:auto;}
.card-word{font-size:34px; font-weight:800; letter-spacing:-0.02em; margin-bottom:10px;}
.card-pos-badge{
  display:inline-block; font-size:11px; font-weight:700; color:var(--accent);
  background:rgba(10,132,255,0.1); padding:3px 10px; border-radius:999px; margin-bottom:14px;
}
.card-speak{
  border:none; background:rgba(0,0,0,0.05); width:44px; height:44px; border-radius:50%;
  color:var(--ink-2); font-size:16px; cursor:pointer;
}
.card-meaning-big{font-size:22px; font-weight:700; margin-bottom:6px;}
.card-example-block{font-size:13.5px; color:var(--ink-3); font-style:italic; padding:0 6px;}
.card-etym{font-size:12px; color:var(--ink-4);}
.cards-actions{
  display:flex; justify-content:center; align-items:center; gap:26px; padding:18px 0 4px;
}
.round-btn{
  border:none; cursor:pointer; border-radius:50%;
  display:flex; flex-direction:column; align-items:center; justify-content:center; gap:2px;
  background:var(--glass-bg-strong); border:1px solid var(--glass-border);
  box-shadow:0 8px 20px rgba(31,38,53,0.1);
  color:var(--ink-2); font-size:11px; font-weight:700;
  transition:transform .15s ease;
}
.round-btn:hover{transform:translateY(-2px);}
.round-btn span{font-size:10px;}
.round-btn.difficult{width:64px; height:64px; font-size:20px; color:var(--orange);}
.round-btn.learned{width:64px; height:64px; font-size:20px; color:var(--green);}
.round-btn.flip{width:52px; height:52px; font-size:16px; color:var(--accent);}

/* ============================== テストモード ============================== */
.quiz-setup{border-radius:var(--radius-lg); padding:26px; margin-top:6px;}
.quiz-setup h2{margin:0 0 18px; font-size:20px; font-weight:700;}
.setup-row{margin-bottom:18px;}
.setup-row > span{display:block; font-size:12.5px; font-weight:700; color:var(--ink-3); margin-bottom:8px;}
.primary-btn{
  width:100%; border:none; border-radius:16px; padding:15px; margin-top:10px;
  background:linear-gradient(135deg, var(--accent), var(--accent-2));
  color:#fff; font-size:15.5px; font-weight:700; cursor:pointer;
  box-shadow:0 10px 24px rgba(10,132,255,0.3);
}
.primary-btn:hover{filter:brightness(1.06);}
.danger-btn{
  width:100%; border:none; border-radius:16px; padding:14px; margin-top:14px;
  background:rgba(255,69,58,0.1); color:var(--red); font-size:14px; font-weight:700; cursor:pointer;
}
.quiz-progress-bar{height:6px; border-radius:6px; background:rgba(0,0,0,0.06); overflow:hidden; margin:14px 0;}
.quiz-progress-bar .fill{height:100%; width:0%; background:linear-gradient(90deg,var(--accent),var(--accent-2)); transition:width .3s ease;}
.quiz-card{border-radius:var(--radius-lg); padding:34px 24px; text-align:center; margin-bottom:22px;}
.quiz-index{font-size:12px; color:var(--ink-4); font-weight:700; margin:0 0 14px;}
.quiz-question{font-size:26px; font-weight:800; margin:0; letter-spacing:-0.01em;}
.quiz-choices{display:grid; grid-template-columns:1fr; gap:12px;}
.quiz-choice-btn{
  border:1px solid rgba(0,0,0,0.07); background:var(--glass-bg);
  -webkit-backdrop-filter:blur(16px); backdrop-filter:blur(16px);
  border-radius:16px; padding:16px 18px; font-size:15px; font-weight:600; color:var(--ink-1);
  text-align:left; cursor:pointer; transition:all .18s ease;
}
.quiz-choice-btn:hover{transform:translateY(-2px); box-shadow:0 6px 16px rgba(0,0,0,0.06);}
.quiz-choice-btn.correct{background:rgba(48,209,88,0.18); border-color:var(--green); color:#1c7c34;}
.quiz-choice-btn.wrong{background:rgba(255,69,58,0.18); border-color:var(--red); color:#b8261d;}
.quiz-card.flash-green{animation:flashGreen .5s ease;}
.quiz-card.shake{animation:shakeCard .45s ease;}
@keyframes flashGreen{0%{box-shadow:0 0 0 0 rgba(48,209,88,0);}30%{box-shadow:0 0 0 12px rgba(48,209,88,0.25);}100%{box-shadow:0 0 0 0 rgba(48,209,88,0);}}
@keyframes shakeCard{0%,100%{transform:translateX(0);}20%{transform:translateX(-10px);}40%{transform:translateX(9px);}60%{transform:translateX(-6px);}80%{transform:translateX(4px);}}

.quiz-result{border-radius:var(--radius-lg); padding:36px 24px; text-align:center; margin-top:10px;}
.result-ring-wrap{display:flex; justify-content:center; margin-bottom:16px;}
.result-ring{position:relative; width:120px; height:120px;}
.result-ring.big{width:150px; height:150px;}
.result-ring svg{width:100%;height:100%; transform:rotate(-90deg);}
.result-ring .ring-bg{fill:none; stroke:rgba(0,0,0,0.07); stroke-width:10;}
.result-ring .ring-fg{fill:none; stroke:var(--accent); stroke-width:10; stroke-linecap:round; stroke-dasharray:327; stroke-dashoffset:327; transition:stroke-dashoffset .8s ease;}
.result-ring.big .ring-fg, .result-ring.big .ring-bg{stroke-dasharray:377; stroke-dashoffset:377;}
.result-ring-label{position:absolute; inset:0; display:flex; align-items:center; justify-content:center; font-size:26px; font-weight:800;}
#result-summary{font-size:15px; color:var(--ink-3); font-weight:600; margin:0 0 20px;}
.result-actions{display:flex; gap:12px;}
.result-actions .ghost-btn, .result-actions .primary-btn{flex:1;}

/* ============================== 統計モード ============================== */
.stats-inner{display:flex; flex-direction:column; gap:16px; padding-top:6px; padding-bottom:20px;}
.stats-grid{display:grid; grid-template-columns:1fr 1fr; gap:16px;}
.stat-card{border-radius:var(--radius-lg); padding:20px;}
.stat-card.wide{grid-column:1 / -1;}
.stat-card h3{margin:0 0 14px; font-size:14px; font-weight:700; color:var(--ink-2);}
.ring-card{display:flex; flex-direction:column; align-items:center; justify-content:center;}
.stat-caption{margin:12px 0 0; font-size:12.5px; color:var(--ink-3); font-weight:600;}
.legend-row{display:flex; align-items:center; gap:8px; font-size:13.5px; color:var(--ink-2); margin-bottom:10px; font-weight:600;}
.legend-row b{margin-left:auto; font-size:15px; color:var(--ink-1);}
.dot{width:10px; height:10px; border-radius:50%; display:inline-block;}
.dot.learned{background:var(--green);}
.dot.difficult{background:var(--orange);}
.dot.new{background:var(--ink-4);}
.chapter-bars{display:flex; flex-direction:column; gap:10px;}
.chapter-bar-row{display:flex; align-items:center; gap:10px; font-size:12px; color:var(--ink-3);}
.chapter-bar-row .label{width:66px; flex-shrink:0; font-weight:700;}
.chapter-bar-track{flex:1; height:10px; border-radius:6px; background:rgba(0,0,0,0.06); overflow:hidden;}
.chapter-bar-fill{height:100%; background:linear-gradient(90deg,var(--accent),var(--accent-2));}
.chapter-bar-row .pct{width:42px; text-align:right; font-weight:700; color:var(--ink-2);}
.chart-wrap{height:220px; position:relative;}
.weak-list{display:flex; flex-direction:column; gap:8px;}
.weak-list li{
  display:flex; justify-content:space-between; align-items:center;
  padding:10px 14px; border-radius:12px; background:rgba(255,69,58,0.06); font-size:13.5px;
}
.weak-list .w-word{font-weight:700;}
.weak-list .w-meaning{color:var(--ink-3); flex:1; margin:0 10px; text-align:left; overflow:hidden; text-overflow:ellipsis; white-space:nowrap;}
.weak-list .w-count{color:var(--red); font-weight:700; font-size:12px;}

/* ============================== 設定モード ============================== */
.settings-inner{display:flex; flex-direction:column; gap:16px; padding-top:6px; padding-bottom:20px;}
.settings-card{border-radius:var(--radius-lg); padding:22px;}
.settings-card h3{margin:0 0 16px; font-size:15px; font-weight:700; display:flex; align-items:center; gap:8px;}
.settings-desc{font-size:13px; color:var(--ink-3); line-height:1.6; margin:0 0 4px;}
.range-row{display:flex; align-items:center; gap:12px; margin:16px 0 12px; font-size:13px; color:var(--ink-2); font-weight:600;}
.range-row input[type=range]{flex:1; accent-color:var(--accent);}
.settings-btn-row{display:flex; gap:10px; margin-top:6px; flex-wrap:wrap;}
.settings-btn-row .ghost-btn{flex:1;}

/* ============================== ボトムナビ ============================== */
#bottom-nav{
  position:fixed; bottom:14px; left:14px; right:14px; z-index:50;
  height:calc(var(--nav-h) - 14px);
  border-radius:26px;
  display:flex; align-items:center; justify-content:space-around;
  max-width:520px; margin:0 auto;
  padding:6px;
}
.nav-btn{
  flex:1; height:100%; border:none; background:transparent; cursor:pointer;
  display:flex; flex-direction:column; align-items:center; justify-content:center; gap:3px;
  color:var(--ink-4); font-size:10.5px; font-weight:600; border-radius:18px;
  transition:all .2s ease;
}
.nav-btn i{font-size:19px;}
.nav-btn.active{color:var(--accent); background:rgba(10,132,255,0.1);}

/* ============================== トースト・ローディング ============================== */
.toast{
  position:fixed; bottom:calc(var(--nav-h) + 20px); left:50%; transform:translateX(-50%) translateY(20px);
  background:rgba(29,29,31,0.9); color:#fff; padding:12px 22px; border-radius:14px;
  font-size:13px; font-weight:600; opacity:0; pointer-events:none; transition:all .3s ease; z-index:100;
  -webkit-backdrop-filter:blur(10px); backdrop-filter:blur(10px);
}
.toast.show{opacity:1; transform:translateX(-50%) translateY(0);}
.loading-overlay{
  position:fixed; inset:0; background:var(--bg-0); z-index:200;
  display:flex; align-items:center; justify-content:center;
  transition:opacity .4s ease;
}
.loading-overlay.hidden{opacity:0; pointer-events:none;}
.spinner{
  width:40px; height:40px; border-radius:50%;
  border:3px solid rgba(10,132,255,0.15); border-top-color:var(--accent);
  animation:spin 0.8s linear infinite;
}
@keyframes spin{to{transform:rotate(360deg);}}

/* ============================== レスポンシブ ============================== */
@media (max-width:600px){
  .stats-grid{grid-template-columns:1fr;}
  .word-headword{min-width:96px;}
  .word-headword .en{font-size:15.5px;}
  .card-word{font-size:28px;}
  .toggle-row{gap:12px 16px;}
}
@media (min-width:900px){
  .view-inner{padding:0 24px;}
}