/* ========================================================================
   歌詞ラボ · Lyrics Lab — 和風 Design System v3
   和紙 · 罫線 · 墨色 · 余白
   ======================================================================== */

:root {
  --bg:        #f3ede1;
  --bg-soft:   #faf7f1;
  --surface:   #fefdf9;
  --surface-2: #f7f3e9;
  --ink:       #1b1a16;
  --ink-2:     #3d3a32;
  --muted:     #8b8776;
  --muted-2:   #b5b09e;
  --line:      #e0d9c8;
  --line-2:    #efe9db;
  --line-3:    #d6ceb8;
  --ai:        #1a3550;
  --ai-d:      #0f2235;
  --ai-light:  #e6ecf2;
  --shu:       #b5433b;
  --shu-d:     #8a312a;
  --shu-light: #f6eae8;
  --kin:       #b08a2c;
  --kin-d:     #7d5f1a;
  --kin-light: #f6edd6;
  --shin:      #356149;
  --shin-d:    #1f3d2e;
  --shin-light:#e4efe8;
  --cha:       #b87a44;
  --cha-d:     #8f5d30;
  --cha-light: #f5ede3;
  --n5:        #356149;
  --n4:        #1a3550;
  --n3:        #b08a2c;
  --n2:        #b87a44;
  --n1:        #b5433b;

  --r-sm: 4px; --r-md: 8px; --r-lg: 14px;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --shadow-card: 0 1px 3px rgba(0,0,0,0.04), 0 4px 16px rgba(0,0,0,0.05);
  --shadow-hover: 0 3px 8px rgba(0,0,0,0.06), 0 8px 28px rgba(0,0,0,0.09);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html {
  background: var(--bg);
  scroll-behavior: smooth;
}
body {
  font-family: 'Noto Sans JP', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--ink-2);
  background-color: var(--bg);
  background-image:
    /* 青海波 — bolder woven pattern */
    repeating-linear-gradient(45deg,
      transparent, transparent 3px,
      rgba(26,53,80,0.035) 3px, rgba(26,53,80,0.035) 4px
    ),
    repeating-linear-gradient(-45deg,
      transparent, transparent 3px,
      rgba(26,53,80,0.035) 3px, rgba(26,53,80,0.035) 4px
    ),
    /* Gold warmth upper-left */
    radial-gradient(ellipse 600px 400px at 15% 5%, rgba(176,138,44,0.10) 0%, transparent 70%),
    /* Deep green lower-right */
    radial-gradient(ellipse 500px 350px at 85% 95%, rgba(53,97,73,0.08) 0%, transparent 70%),
    /* Indigo center */
    radial-gradient(ellipse 700px 500px at 55% 45%, rgba(26,53,80,0.04) 0%, transparent 70%);
  font-size: 14px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}

h1,h2,h3 { font-family: 'Noto Serif JP', 'Instrument Serif', serif; font-weight: 500; }

/* ========== Top bar ========== */
.topbar {
  background: linear-gradient(180deg, #fefdf9 0%, #f8f4ea 100%);
  border-bottom: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}
.topbar::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: linear-gradient(90deg, var(--ai) 0%, var(--kin) 50%, var(--shu) 100%);
}
.topbar::after {
  content: ''; position: absolute; bottom:0; left:0; right:0; height:3px;
  background:
    repeating-linear-gradient(90deg, transparent, transparent 8px, var(--kin) 8px, var(--kin) 9px);
  opacity: 0.18;
}
.topbar-inner {
  max-width: 1100px; margin: 0 auto; padding: 36px 40px;
  display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.brand h1 { font-size: 40px; line-height: 1.05; color: var(--ink); margin:0; }
.brand h1 .divider { color: var(--muted-2); font-weight:300; margin:0 6px; }
.brand .kicker { font-size:10.5px; letter-spacing:.30em; text-transform:uppercase; color:var(--muted); margin-bottom:10px; font-weight:500; }
.brand .sub { font-size:13px; color:var(--muted); margin-top:12px; max-width:560px; line-height:1.65; }

/* ========== Layout ========== */
main { max-width:1100px; margin:0 auto; padding:48px 40px 80px; }
.section { margin-bottom:64px; }
.result-section {
  opacity:0; transform:translateY(12px);
  transition: opacity .5s var(--ease-out), transform .5s var(--ease-out);
}
.result-section.visible { opacity:1; transform:translateY(0); }

.section-head {
  display:flex; align-items:baseline; gap:18px;
  margin-bottom:28px; padding-bottom:20px;
  border-bottom:1px solid var(--line); position:relative;
}
.section-head::after {
  content:''; position:absolute; bottom:-1.5px; left:0;
  width:60px; height:3px; background:var(--kin); border-radius:2px;
}
.section-head .num {
  font-family:'Noto Serif JP','Instrument Serif',serif;
  font-size:36px; color:var(--muted-2); line-height:1; min-width:52px;
  font-style:italic;
}
.section-head h2 { font-size:28px; color:var(--ink); margin:0; line-height:1.1; }
.section-head .meta { margin-left:auto; font-size:12px; color:var(--muted); }

/* ========== Panels ========== */
.panel {
  background: var(--surface);
  border: 1px solid var(--line-2);
  border-radius: var(--r-lg);
  padding: 30px 36px;
  box-shadow: var(--shadow-card);
  position: relative;
}
.panel::before {
  content:''; position:absolute; top:0; left:24px; right:24px;
  height:2px;
  background: linear-gradient(90deg, transparent, var(--kin) 30%, var(--kin) 70%, transparent);
  opacity: 0.35;
  border-radius: 1px;
}

/* ========== Textarea ========== */
textarea {
  width:100%; min-height:220px;
  border:1px solid var(--line-3); border-radius:var(--r-md);
  padding:22px 26px;
  font-family:'Noto Serif JP','Source Han Serif SC',Georgia,serif;
  font-size:17px; line-height:2.2; color:var(--ink);
  background: var(--bg-soft);
  resize:vertical; outline:none;
  transition: border-color .25s, box-shadow .25s, background .25s;
}
textarea:focus {
  border-color: var(--ai);
  box-shadow: 0 0 0 4px rgba(30,63,90,0.06);
  background: var(--surface);
}
textarea::placeholder { color:var(--muted-2); font-size:15px; }

.input-row {
  display:flex; justify-content:space-between; align-items:center; gap:16px;
  margin-top:20px; padding-top:20px; border-top:1px solid var(--line-2);
}
.input-row .hint { font-size:12px; color:var(--muted); }
.input-row .hint b { font-family:'JetBrains Mono',monospace; color:var(--ink); font-weight:500; }

/* ========== Buttons ========== */
.btn {
  display:inline-flex; align-items:center; gap:8px;
  padding:10px 20px;
  border:1px solid var(--line-3); background:var(--surface);
  color:var(--ink-2); border-radius:var(--r-md);
  font-size:13px; font-weight:500; cursor:pointer;
  transition: all .2s var(--ease-out);
  font-family:inherit;
}
.btn:hover { border-color:var(--ai); color:var(--ai); background:var(--ai-light); }
.btn:active { transform:scale(.97); }
.btn.primary {
  background:var(--ink); color:var(--bg); border-color:var(--ink); font-weight:600;
}
.btn.primary:hover {
  background:var(--ai); border-color:var(--ai); color:#fff;
  transform:translateY(-1px); box-shadow:0 4px 12px rgba(30,63,90,.2);
}
.btn .arr { font-family:'Instrument Serif',serif; font-size:18px; transition:transform .2s; }
.btn:hover .arr { transform:translateX(2px); }
.btn.loading { pointer-events:none; opacity:.7; }
.btn-sm { padding:6px 14px; font-size:12px; border-radius:var(--r-sm); }
.btn-sm:hover { transform:translateY(-1px); }

/* ========== Filter bar — 和紙風 ========== */
.filter-bar {
  display:flex; align-items:center; gap:16px; flex-wrap:wrap;
  padding:18px 26px; margin-bottom:28px;
  background: linear-gradient(135deg, #faf7f1 0%, #f5f0e5 100%);
  border:1px solid var(--line-2); border-radius:var(--r-lg);
  box-shadow: var(--shadow-card);
  position: relative;
  overflow: hidden;
}
.filter-bar::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--ai) 0%, var(--kin) 50%, var(--shin) 100%);
  opacity: 0.5;
}
.filter-label {
  font-size:11px; letter-spacing:.14em; text-transform:uppercase;
  color:var(--muted); font-weight:600; white-space:nowrap;
}
.filter-pills { display:flex; gap:6px; flex-wrap:wrap; }
.filter-pill {
  padding:5px 14px; border-radius:20px; border:1px solid var(--line-3);
  background:var(--surface); color:var(--muted);
  font-size:12px; font-weight:500; cursor:pointer;
  transition: all .2s var(--ease-out);
  font-family: 'JetBrains Mono', monospace;
  white-space:nowrap;
}
.filter-pill:hover { border-color:var(--muted-2); color:var(--ink); }
.filter-pill.active {
  color:#fff; border-color:transparent;
  box-shadow: 0 2px 8px rgba(0,0,0,0.12);
}
.filter-pill.active[data-level="N5"] { background:var(--n5); }
.filter-pill.active[data-level="N4"] { background:var(--n4); }
.filter-pill.active[data-level="N3"] { background:var(--n3); }
.filter-pill.active[data-level="N2"] { background:var(--n2); }
.filter-pill.active[data-level="N1"] { background:var(--n1); }
.filter-pill.active[data-level="all"] { background:var(--ink); }
.filter-pill.active[data-level="unknown"] { background:var(--muted); }
.filter-actions { margin-left:auto; display:flex; gap:8px; }

/* ========== KPI row ========== */
.kpi-row {
  display:grid; grid-template-columns:repeat(6,1fr); gap:0;
  border:1px solid var(--line-2); border-radius:var(--r-lg);
  background:var(--surface); overflow:hidden;
  margin-bottom:28px; box-shadow:var(--shadow-card);
}
@media(max-width:800px){.kpi-row{grid-template-columns:repeat(3,1fr)}}
@media(max-width:480px){.kpi-row{grid-template-columns:repeat(2,1fr)}}
.kpi {
  padding:24px 26px 20px; border-right:1px solid var(--line-2);
  position:relative; transition:background .2s;
}
.kpi:last-child { border-right:none; }
.kpi:hover { background:var(--bg-soft); }
.kpi .label { font-size:10.5px; letter-spacing:.16em; text-transform:uppercase; color:var(--muted); margin-bottom:16px; }
.kpi .value { font-family:'Noto Serif JP','Instrument Serif',serif; font-size:52px; line-height:1; color:var(--ink); }
.kpi .bar { margin-top:16px; height:3px; background:var(--line); border-radius:2px; overflow:hidden; }
.kpi .bar i { display:block; height:100%; width:0; border-radius:2px; transition:width 1s var(--ease-spring); }
.kpi.lv-n5 .value { color:var(--n5); } .kpi.lv-n5 .bar i { background:var(--n5); }
.kpi.lv-n4 .value { color:var(--n4); } .kpi.lv-n4 .bar i { background:var(--n4); }
.kpi.lv-n3 .value { color:var(--n3); } .kpi.lv-n3 .bar i { background:var(--n3); }
.kpi.lv-n2 .value { color:var(--n2); } .kpi.lv-n2 .bar i { background:var(--n2); }
.kpi.lv-n1 .value { color:var(--n1); } .kpi.lv-n1 .bar i { background:var(--n1); }
.kpi.lv-unknown .value { color:var(--muted-2); } .kpi.lv-unknown .bar i { background:var(--muted-2); }

/* ========== Charts ========== */
.chart-grid { display:grid; grid-template-columns:1fr 1fr; gap:20px; }
@media(max-width:760px){.chart-grid{grid-template-columns:1fr}}
.chart-box {
  background:var(--surface); border:1px solid var(--line-2);
  border-radius:var(--r-lg); padding:20px 20px 12px;
  display:flex; flex-direction:column;
  box-shadow:var(--shadow-card);
  transition: transform .2s, box-shadow .2s;
}
.chart-box:hover { transform:translateY(-2px); box-shadow:var(--shadow-hover); }
.chart-head { display:flex; justify-content:space-between; align-items:baseline; margin-bottom:10px; padding-bottom:10px; border-bottom:1px solid var(--line-2); }
.chart-head .title { font-family:'Noto Serif JP','Instrument Serif',serif; font-size:17px; color:var(--ink); }
.chart-head .hint { font-size:11px; letter-spacing:.14em; text-transform:uppercase; color:var(--muted); }
.chart { flex:1; min-height:280px; }

/* ========== Lines — 和紙卡片 ========== */
.lines-container { display:flex; flex-direction:column; gap:8px; }

.lyric-line {
  background: linear-gradient(135deg, #fefdf9 0%, #fbf9f3 100%);
  border: 1px solid var(--line-2);
  border-radius: var(--r-md);
  padding: 20px 24px;
  display: flex; flex-wrap: wrap; gap: 16px; align-items: flex-start;
  opacity:0; transform:translateY(8px);
  transition: opacity .4s var(--ease-out), transform .4s var(--ease-out),
              background .2s, border-color .2s, box-shadow .2s;
  position: relative;
  overflow: hidden;
}
.lyric-line::before {
  content: ''; position: absolute; left: 0; top: 0; bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--kin) 0%, var(--ai) 50%, var(--shin) 100%);
  border-radius: 0 2px 2px 0;
  opacity: 0.5; transition: opacity .25s, width .25s;
}
.lyric-line.visible { opacity:1; transform:translateY(0); }
.lyric-line:hover {
  background: #fefdf9;
  border-color: var(--line-3);
  box-shadow: var(--shadow-hover);
  transform: translateX(4px);
}
.lyric-line:hover::before { opacity: 0.9; width: 5px; }
.lyric-line .jp-text { flex:1; min-width:260px; }
.lyric-line .jp-text .original {
  font-family:'Noto Serif JP',serif; font-size:21px;
  color:var(--ink); line-height:1.85; letter-spacing:.03em;
  margin-bottom:6px;
}
.lyric-line .jp-text .with-ruby {
  font-family:'Noto Serif JP',serif; font-size:17px;
  color:var(--ink-2); line-height:2.6; letter-spacing:.02em;
}
.tags-area { display:flex; flex-direction:column; gap:4px; align-items:flex-end; }
.vocab-tags { display:flex; flex-wrap:wrap; gap:5px; justify-content:flex-end; }

/* N5 词汇默认淡化 */
.vocab-tag.lv-n5 { opacity:0.55; }
.vocab-tag.lv-n5:hover { opacity:1; }
.vocab-tag.filtered-out { display:none !important; }

ruby { ruby-align:center; }
rt { font-family:'Noto Sans JP','PingFang SC',sans-serif; font-size:.44em; color:var(--ai); font-weight:500; }

/* ========== Vocab tag ========== */
.vocab-tag {
  display:inline-flex; align-items:center; gap:5px;
  padding:5px 12px; border-radius:14px;
  font-size:11px; font-weight:600; letter-spacing:.03em;
  white-space:nowrap; cursor:pointer;
  transition: all .2s var(--ease-spring);
  user-select:none;
}
.vocab-tag:hover { transform:translateY(-2px) scale(1.04); box-shadow:0 3px 10px rgba(0,0,0,.1); }
.vocab-tag:active { transform:scale(.96); }
.vocab-tag .word { font-family:'Noto Serif JP',serif; font-size:12.5px; }
.vocab-tag .yomi { font-family:'JetBrains Mono',monospace; font-size:10px; opacity:.6; }
.vocab-tag .meaning { opacity:.7; font-weight:400; font-size:10px; }
.vocab-tag.lv-n5 { background:var(--shin-light); color:var(--n5); border:1px solid #c0d8c8; }
.vocab-tag.lv-n4 { background:var(--ai-light); color:var(--n4); border:1px solid #c3d0e0; }
.vocab-tag.lv-n3 { background:var(--kin-light); color:var(--n3); border:1px solid #e2d5b0; }
.vocab-tag.lv-n2 { background:var(--cha-light); color:var(--n2); border:1px solid #e6d2bb; }
.vocab-tag.lv-n1 { background:var(--shu-light); color:var(--n1); border:1px solid #e4cac6; }
.vocab-tag.is-starred::before { content:'★'; font-size:9px; color:var(--kin); animation:popStar .3s var(--ease-spring); }

@keyframes popStar { 0%{transform:scale(0)} 50%{transform:scale(1.4)} 100%{transform:scale(1)} }

/* ========== Grammar tag ========== */
.grammar-tags { display:flex; flex-wrap:wrap; gap:4px; margin-top:4px; justify-content:flex-end; }
.grammar-tag {
  display:inline-flex; align-items:center; gap:6px;
  padding:3px 10px; border-radius:12px;
  font-size:10.5px; font-weight:500; white-space:nowrap;
  border:1px dashed; transition:all .2s;
}
.grammar-tag:hover { transform:translateY(-1px); }
.grammar-tag .g-pattern { font-family:'Noto Serif JP',serif; font-size:11px; }
.grammar-tag .g-meaning { font-size:10px; opacity:.7; }
.grammar-tag.lv-n5 { background:#e6f0e9; color:var(--n5); border-color:#b9d8c4; }
.grammar-tag.lv-n4 { background:#e6ebf2; color:var(--n4); border-color:#c3d0e0; }
.grammar-tag.lv-n3 { background:#f7f1de; color:var(--n3); border-color:#e0d0a0; }
.grammar-tag.lv-n2 { background:#f5ede3; color:var(--n2); border-color:#e0c8aa; }
.grammar-tag.lv-n1 { background:#f6eae8; color:var(--n1); border-color:#e0c0ba; }

.no-vocab { font-size:12px; color:var(--muted-2); font-style:italic; }

/* ========== Vocab grid ========== */
.vocab-grid { display:grid; grid-template-columns:repeat(auto-fill,minmax(340px,1fr)); gap:20px; }
.vocab-card {
  background:var(--surface); border:1px solid var(--line-2);
  border-radius:var(--r-lg); overflow:hidden;
  transition:transform .2s, box-shadow .2s;
  box-shadow:var(--shadow-card);
}
.vocab-card:hover { transform:translateY(-2px); box-shadow:var(--shadow-hover); }
.vocab-card .card-head {
  padding:14px 20px; font-size:11px; letter-spacing:.14em;
  text-transform:uppercase; font-weight:600;
  display:flex; justify-content:space-between; align-items:center;
}
.vocab-card .card-head.lv-n5 { background:var(--shin-light); color:var(--n5); }
.vocab-card .card-head.lv-n4 { background:var(--ai-light); color:var(--n4); }
.vocab-card .card-head.lv-n3 { background:var(--kin-light); color:var(--n3); }
.vocab-card .card-head.lv-n2 { background:var(--cha-light); color:var(--n2); }
.vocab-card .card-head.lv-n1 { background:var(--shu-light); color:var(--n1); }
.vocab-card .card-body { padding:8px 20px 12px; display:flex; flex-direction:column; }
.vocab-card .card-body .entry {
  display:flex; align-items:center; gap:10px;
  padding:8px 10px; border-bottom:1px solid var(--line-2);
  font-size:13px; cursor:pointer; transition:all .15s;
  border-radius:var(--r-sm); margin:0 -4px;
}
.vocab-card .card-body .entry:last-child { border-bottom:none; }
.vocab-card .card-body .entry:hover { background:var(--bg-soft); }
.vocab-card .card-body .entry .jp { font-family:'Noto Serif JP',serif; color:var(--ink); font-size:15px; }
.vocab-card .card-body .entry .yomi { font-family:'JetBrains Mono',monospace; font-size:11px; color:var(--muted); }
.vocab-card .card-body .entry .cn { margin-left:auto; font-size:12px; color:var(--muted); }
.star-icon { font-size:11px; color:var(--muted-2); min-width:16px; transition:color .2s, transform .2s; }
.entry.is-starred .star-icon { color:var(--kin); transform:scale(1.2); }
.entry.is-starred .jp { color:var(--kin-d); }
.btn-remove {
  margin-left:auto; background:none; border:1px solid var(--line-3);
  border-radius:4px; color:var(--muted); cursor:pointer;
  font-size:10px; padding:3px 8px; transition:all .2s;
}
.btn-remove:hover { background:var(--shu); color:#fff; border-color:var(--shu); transform:scale(1.1); }

/* grammar entry */
.grammar-entry {
  display:flex; align-items:center; gap:10px;
  padding:10px; border-bottom:1px solid var(--line-2);
  font-size:13px; margin:0 -4px; border-radius:var(--r-sm);
  transition:background .15s;
}
.grammar-entry:last-child{border-bottom:none}
.grammar-entry:hover{background:var(--bg-soft)}
.grammar-entry .g-pattern{font-family:'Noto Serif JP',serif;color:var(--ink);font-size:14px}
.grammar-entry .g-meaning{color:var(--muted);font-size:12px;margin-left:auto}

.empty-state{text-align:center;padding:36px;color:var(--muted);font-size:13px;line-height:1.8}

/* ========== Modal — 和紙质感 ========== */
.modal-overlay {
  position:fixed; inset:0;
  background:rgba(27,26,22,.35);
  backdrop-filter:blur(6px);
  z-index:10000;
  display:flex; align-items:center; justify-content:center;
  opacity:0; pointer-events:none;
  transition:opacity .3s;
}
.modal-overlay.active { opacity:1; pointer-events:all; }
.modal-card {
  background: linear-gradient(160deg, #fefdf9 0%, #f8f4ea 100%);
  border:1px solid var(--line); border-radius:var(--r-lg);
  padding:40px 44px 32px;
  min-width:380px; max-width:500px;
  box-shadow: 0 24px 72px rgba(0,0,0,.2);
  position:relative;
  transform:translateY(20px) scale(.95);
  transition:transform .35s var(--ease-spring);
}
.modal-card::before {
  content: ''; position: absolute; top: 0; left: 30px; right: 30px;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--kin) 40%, var(--kin) 60%, transparent);
  opacity: 0.5;
}
.modal-overlay.active .modal-card { transform:translateY(0) scale(1); }
.modal-close {
  position:absolute; top:14px; right:16px;
  background:none; border:none; font-size:18px;
  color:var(--muted); cursor:pointer;
  transition:color .2s;
  width:32px; height:32px; display:flex; align-items:center; justify-content:center;
  border-radius:50%;
}
.modal-close:hover { color:var(--shu); background:var(--shu-light); }
.modal-level { font-size:11px; letter-spacing:.14em; text-transform:uppercase; color:var(--muted); margin-bottom:8px; }
.modal-word { font-family:'Noto Serif JP',serif; font-size:48px; color:var(--ink); line-height:1.1; margin-bottom:10px; }
.modal-reading { font-family:'JetBrains Mono',monospace; font-size:20px; color:var(--ai); margin-bottom:14px; }
.modal-meaning { font-size:16px; color:var(--ink-2); line-height:1.6; margin-bottom:10px; }
.modal-example {
  font-family: 'Noto Serif JP', serif;
  font-size: 17px;
  color: var(--ai-d);
  line-height: 1.8;
  margin-bottom: 22px;
  padding: 16px 20px;
  background: linear-gradient(135deg, #e9eef4 0%, #eef2f7 100%);
  border-left: 4px solid var(--ai);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}
.modal-actions { display:flex; gap:10px; }

/* ========== Study mode ========== */
body.study-mode .lyric-line .with-ruby { opacity:0; transition:opacity .2s; }
body.study-mode .lyric-line .with-ruby:hover { opacity:1; }
body.study-mode .lyric-line .original { font-size:24px; }
body.study-mode .vocab-tag .yomi { display:none; }
body.study-mode .vocab-tag .meaning { display:none; }
body.study-mode .vocab-tag:hover .yomi { display:inline; }
body.study-mode .vocab-tag:hover .meaning { display:inline; }
.btn-study-active { background:var(--ai) !important; color:#fff !important; border-color:var(--ai) !important; }

/* ========== Toast ========== */
.toast {
  position:fixed; top:28px; right:28px;
  background:var(--ink); color:var(--bg);
  padding:14px 22px; border-radius:var(--r-md);
  font-size:13px; z-index:9999;
  font-family:'Noto Sans JP',sans-serif;
  box-shadow:0 8px 28px rgba(0,0,0,.15);
  pointer-events:none;
}
.toast-enter { animation:toastIn .35s var(--ease-spring); }
.toast-exit { animation:toastOut .25s ease-in forwards; }
.toast.err { background:var(--shu-d); }
.toast.ok { background:var(--shin-d); }
@keyframes toastIn { from{opacity:0;transform:translateX(30px) scale(.92)} to{opacity:1;transform:translateX(0) scale(1)} }
@keyframes toastOut { from{opacity:1;transform:translateX(0) scale(1)} to{opacity:0;transform:translateX(20px) scale(.9)} }

/* ========== Loading ========== */
.spinner-overlay {
  position:fixed; inset:0;
  background:rgba(245,240,230,.6);
  backdrop-filter:blur(4px);
  z-index:9998;
  display:flex; align-items:center; justify-content:center; flex-direction:column; gap:16px;
  opacity:0; pointer-events:none; transition:opacity .3s;
}
.spinner-overlay.active { opacity:1; pointer-events:all; }
.spinner-text { font-family:'Noto Serif JP',serif; font-size:18px; color:var(--ink); animation:spinnerPulse 1.5s ease-in-out infinite; }
.spinner-chars { display:flex; gap:4px; font-size:28px; font-family:'Noto Serif JP',serif; }
.spinner-chars span { animation:charFloat 1.8s ease-in-out infinite; color:var(--muted-2); }
.spinner-chars span:nth-child(1){animation-delay:0s}
.spinner-chars span:nth-child(2){animation-delay:.15s}
.spinner-chars span:nth-child(3){animation-delay:.3s}
.spinner-chars span:nth-child(4){animation-delay:.45s}
.spinner-chars span:nth-child(5){animation-delay:.6s}
@keyframes spinnerPulse { 0%,100%{opacity:.5} 50%{opacity:1} }
@keyframes charFloat { 0%,100%{transform:translateY(0);opacity:.3} 50%{transform:translateY(-8px);opacity:.9} }

.hidden { display:none !important; }

/* ========== Footer ========== */
.foot {
  margin:72px 0 0; padding-top:36px;
  border-top:1px solid var(--line);
  display:flex; justify-content:space-between;
  font-size:11px; letter-spacing:.14em; text-transform:uppercase; color:var(--muted);
  position:relative;
}
.foot::before {
  content:''; position:absolute; top:-2px; left:0;
  width:80px; height:3px;
  background: linear-gradient(90deg, var(--kin) 0%, var(--ai) 100%);
  border-radius: 2px;
}

/* ========== History list ========== */
.history-list { display:flex; flex-direction:column; gap:6px; }
.history-item {
  display:flex; align-items:center; gap:16px; flex-wrap:wrap;
  padding:14px 20px;
  background:var(--surface); border:1px solid var(--line-2);
  border-radius:var(--r-md);
  cursor:pointer; transition: all .2s;
  box-shadow: var(--shadow-card);
}
.history-item:hover {
  border-color:var(--ai); box-shadow:var(--shadow-hover);
  transform:translateX(3px);
}
.history-item.active {
  border-color:var(--kin); background:var(--kin-light);
  box-shadow: 0 0 0 1px var(--kin);
  transform:translateX(3px);
}
.history-item.active::before {
  content:''; position:absolute; left:0; top:0; bottom:0;
  width:3px; background:var(--kin); border-radius:0 2px 2px 0;
}
.history-item .h-preview {
  flex:1; min-width:200px;
  font-family:'Noto Serif JP',serif; font-size:14px;
  color:var(--ink); line-height:1.6;
  overflow:hidden; text-overflow:ellipsis; white-space:nowrap;
}
.history-item .h-meta {
  display:flex; gap:12px; align-items:center;
  font-size:11px; color:var(--muted);
  white-space:nowrap;
}
.history-item .h-meta b { font-family:'JetBrains Mono',monospace; color:var(--ink-2); font-weight:500; }
.history-item .h-date { font-size:11px; color:var(--muted-2); white-space:nowrap; }
.history-item .h-delete {
  background:none; border:1px solid var(--line-3); border-radius:50%;
  width:28px; height:28px; display:flex; align-items:center; justify-content:center;
  color:var(--muted); cursor:pointer; font-size:12px;
  transition:all .15s; flex-shrink:0;
}
.history-item .h-delete:hover { background:var(--shu); color:#fff; border-color:var(--shu); }

/* ========== Responsive ========== */
@media(max-width:720px){
  .topbar-inner{padding:24px 20px}
  main{padding:32px 20px 60px}
  .brand h1{font-size:28px}
  .kpi-row{grid-template-columns:repeat(3,1fr)}
  .chart-grid{grid-template-columns:1fr}
  .vocab-grid{grid-template-columns:1fr}
  .lyric-line{flex-direction:column}
  .lyric-line .tags-area{align-items:flex-start}
  .vocab-tags{justify-content:flex-start}
  .grammar-tags{justify-content:flex-start}
  .filter-bar{flex-direction:column;align-items:flex-start;gap:10px}
  .filter-actions{margin-left:0}
}