@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;600;700&family=Noto+Serif+JP:wght@400;500;600;700&display=swap');
:root{--ink:#26362f;--muted:#738078;--line:#e7e9df;--paper:#fffef9;--bg:#f6f7f1;--green:#466a51;--accent:#dc7859;--pale:#edf4e9}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:'Noto Sans JP','Yu Gothic',Meiryo,sans-serif;font-size:15px}.shell{max-width:1260px;margin:auto;padding:0 30px}.site-header{height:88px;display:flex;align-items:center;justify-content:space-between}.brand{text-decoration:none;color:var(--ink);font-family:'Noto Serif JP',serif;font-size:24px;font-weight:700;letter-spacing:.08em}.brand span{color:var(--green)}.brand small{display:block;font-family:'Noto Sans JP',sans-serif;font-size:10px;font-weight:500;color:var(--muted);letter-spacing:.12em;margin-top:2px}.book-tag{font-size:12px;color:var(--muted);border:1px solid #d8dfd4;padding:8px 13px;border-radius:50px}.hero{position:relative;overflow:hidden;background:#eaf2e8;border-radius:22px;padding:46px 54px 38px;min-height:270px}.hero:after{content:'一';position:absolute;right:45px;top:-70px;font:400 330px 'Noto Serif JP',serif;color:#dce9d9;pointer-events:none}.eyebrow{font-size:12px;font-weight:700;letter-spacing:.2em;color:var(--green)}.eyebrow span{padding:0 12px;color:#9aafa0}.hero h1{position:relative;z-index:1;margin:8px 0 12px;font:700 52px/1.25 'Noto Serif JP',serif;letter-spacing:.08em}.hero h1 em{font-style:normal;color:var(--accent)}.hero p{position:relative;z-index:1;line-height:1.8;color:#5a6b5d;margin:0 0 22px}.hero-meta{position:relative;z-index:1;display:flex;gap:9px}.hero-meta span{font-size:11px;background:#fff9;padding:7px 12px;border-radius:30px;color:var(--green)}.layout{display:grid;grid-template-columns:minmax(0,1fr) 292px;gap:28px;margin-top:28px;align-items:start}.main-column{min-width:0}.tabs{display:flex;background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:6px;gap:4px;margin-bottom:18px}.tab{flex:1;border:0;border-radius:10px;background:transparent;padding:13px 6px;color:#6c786d;font:600 14px 'Noto Sans JP',sans-serif;cursor:pointer}.tab.active{background:var(--green);color:white;box-shadow:0 3px 8px #2d563723}.panel{display:none;background:var(--paper);border:1px solid var(--line);border-radius:18px;padding:29px 31px 35px;min-height:430px}.panel.active{display:block}.section-head{display:flex;justify-content:space-between;align-items:end;gap:12px;border-bottom:1px solid var(--line);padding-bottom:20px}.section-kicker{font-size:10px;font-weight:700;letter-spacing:.16em;color:#9ba99c}.section-head h2{margin:3px 0 0;font:600 28px 'Noto Serif JP',serif}.section-head p{font-size:12px;color:var(--muted);margin:0 0 3px}.toolbar{display:flex;gap:17px;padding:16px 0 6px}.text-button{background:none;border:none;padding:3px 0;color:var(--green);font:600 12px 'Noto Sans JP',sans-serif;cursor:pointer;text-decoration:underline;text-underline-offset:3px}.line{display:grid;grid-template-columns:36px 57px minmax(0,1fr) 74px;gap:8px;padding:17px 3px;border-bottom:1px solid #ebeee9;align-items:start}.line.active{background:#f4f8f0;border-radius:10px;margin:0 -10px;padding-left:13px;padding-right:13px}.line-number{color:#a4aea6;font-size:11px;padding-top:9px;font-variant-numeric:tabular-nums}.speaker{display:inline-block;font-size:12px;font-weight:700;padding:6px 8px;border-radius:6px;margin-top:2px;white-space:nowrap;background:#e8f1e8;color:var(--green)}.speaker.nakamura{background:#f6eae5;color:#b26048}.japanese{font:500 18px/2.1 'Noto Serif JP','Yu Mincho',serif;letter-spacing:.015em;cursor:pointer}.japanese:hover{color:var(--green)}ruby rt{font:500 10px 'Noto Sans JP',sans-serif;color:#8b978d;letter-spacing:0}body.hide-ruby rt{visibility:hidden}.line-translation{display:none;margin:8px 0 0;color:#69766b;line-height:1.8;font-size:14px}.line-translation.visible{display:block}.line-actions{display:flex;flex-direction:column;align-items:end;gap:7px}.icon-button,.reveal-button{border:0;background:transparent;color:var(--green);cursor:pointer;font-size:12px;padding:5px}.icon-button{font-size:18px}.reveal-button{color:#8a978a}.sidebar{position:sticky;top:20px}.player-card{background:#fff;border:1px solid var(--line);border-radius:18px;padding:24px;box-shadow:0 9px 30px #1d44340b}.player-heading{display:flex;gap:12px;align-items:center}.player-icon{display:grid;place-items:center;width:45px;height:45px;border-radius:12px;background:#e9f2e9;color:var(--green);font-size:24px}.player-heading small{display:block;color:#a1aaa1;font-size:9px;letter-spacing:.16em;font-weight:700}.player-heading strong{font-size:16px}.now-playing{font:600 13px 'Noto Serif JP',serif;color:var(--green);margin-top:26px;min-height:23px}.progress-row{display:flex;align-items:center;gap:9px;color:#919b92;font-size:10px;font-variant-numeric:tabular-nums;margin-top:9px}.progress-row input{min-width:0;flex:1;accent-color:var(--green);height:4px}.player-actions{display:flex;align-items:center;justify-content:center;gap:18px;margin:18px 0 26px}.player-actions button{border:0;background:none;color:var(--green);font-size:12px;cursor:pointer}.player-actions .play-button{width:52px;height:52px;border-radius:50%;background:var(--green);color:white;font-size:18px;box-shadow:0 7px 15px #466a5140}.speed-heading{border-top:1px solid var(--line);padding-top:20px;font-size:12px;font-weight:700}.speed-options{display:flex;gap:7px;margin-top:10px}.speed-options button{flex:1;border:1px solid #dfe5db;border-radius:8px;background:#fafbf8;padding:8px 0;color:#68786a;cursor:pointer}.speed-options button.selected{background:var(--pale);border-color:#b5d2ba;color:var(--green);font-weight:700}.full-playback{width:100%;border:0;background:none;margin-top:19px;color:var(--green);font-size:11px;font-weight:700;text-align:left;cursor:pointer}.tip-card{background:#eff3e8;border-radius:14px;padding:20px;margin-top:16px;color:#667466}.tip-card span{display:block;font-size:12px;font-weight:700;color:var(--green);margin-bottom:8px}.tip-card p{font-size:12px;line-height:1.8;margin:0}.source-card{font-size:10px;line-height:1.8;color:#9ca69d;margin:18px 5px}.word-list{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:23px}.word-item{border:1px solid var(--line);border-radius:11px;padding:14px 16px;background:#fff}.word-item strong{display:block;font:600 17px 'Noto Serif JP',serif}.word-item small{color:var(--green);font-size:12px}.word-item p{margin:7px 0 0;color:#6c776d;font-size:13px;line-height:1.5}.note-list{margin-top:12px}.note{border-bottom:1px solid var(--line);padding:18px 3px}.note h3{font:600 16px/1.7 'Noto Serif JP',serif;margin:0 0 6px}.note p{margin:0;color:#5c6b60;line-height:1.9;font-size:14px}.note .note-index{display:inline-block;color:#a7b0a7;font:600 12px 'Noto Sans JP',sans-serif;width:29px}.translation-list{margin-top:20px}.translation-item{display:grid;grid-template-columns:55px 1fr;gap:12px;padding:13px 0;border-bottom:1px solid var(--line)}.translation-item strong{font-size:12px;color:var(--green)}.translation-item p{margin:0;line-height:1.85;color:#4f5c51}footer{text-align:center;padding:48px 0;color:#a8b2a6;font-size:11px}footer span{padding:0 7px}@media(max-width:850px){.layout{grid-template-columns:1fr}.sidebar{position:static;grid-row:1}.player-card{max-width:none}.tip-card,.source-card{display:none}}@media(max-width:570px){.shell{padding:0 14px}.site-header{height:70px}.brand{font-size:20px}.book-tag{font-size:10px;padding:6px 8px}.hero{padding:33px 26px;min-height:240px}.hero h1{font-size:40px}.hero:after{right:-50px}.panel{padding:22px 17px}.section-head{align-items:start;flex-direction:column}.line{grid-template-columns:23px 48px minmax(0,1fr);gap:5px}.line-actions{grid-column:3;flex-direction:row;justify-content:flex-end}.japanese{font-size:16px}.speaker{font-size:11px;padding:5px}.word-list{grid-template-columns:1fr}}
@media(max-width:570px){.hero h1{font-size:34px;white-space:nowrap;letter-spacing:0}.hero h1 rt{font-size:9px}.speaker rt{font-size:7px}}
@media(max-width:400px){.book-tag{display:none}.hero-meta{gap:4px}.hero-meta span{font-size:10px;padding:6px 8px;white-space:nowrap}}

/* Mobile layout is selected by available width, including narrow desktop windows. */
.lesson-picker{display:flex;align-items:center;gap:10px;margin:0 0 17px;padding:12px 16px;background:var(--paper);border:1px solid var(--line);border-radius:14px}
.lesson-picker label{font-size:13px;font-weight:700;color:var(--green);white-space:nowrap}
.lesson-picker select{min-width:200px;max-width:100%;flex:0 1 300px;border:1px solid #d8dfd4;border-radius:9px;background:#fff;padding:10px 12px;color:var(--ink);font:600 14px 'Noto Sans JP',sans-serif}
.lesson-step{width:38px;height:38px;flex:none;border:1px solid #d8dfd4;border-radius:9px;background:#fff;color:var(--green);font-size:24px;line-height:1;cursor:pointer}
.lesson-step:disabled{opacity:.4;cursor:default}
.lesson-memory{margin-left:auto;font-size:11px;color:var(--muted)}
.line{grid-template-columns:36px 92px minmax(0,1fr) 74px}
.translation-item{grid-template-columns:90px 1fr}
@media(max-width:640px){
  body{overflow-x:hidden}
  button{touch-action:manipulation}
  .shell{padding:0 14px 205px}
  .lesson-picker{gap:5px;padding:9px;margin-bottom:11px}
  .lesson-picker label{font-size:11px;margin-right:2px}
  .lesson-picker select{min-width:0;flex:1;padding:9px 4px;font-size:12px}
  .lesson-step{width:32px;height:36px;font-size:21px}
  .lesson-memory{display:none}
  .site-header{height:64px}
  .brand{font-size:20px;white-space:nowrap}
  .brand small{font-size:9px}
  .book-tag{display:none}
  .hero{min-height:0;padding:25px 23px 24px;border-radius:18px}
  .hero:after{font-size:240px;top:-48px;right:-38px}
  .hero h1{font-size:clamp(29px,8vw,40px);white-space:normal;overflow-wrap:anywhere;letter-spacing:0;margin:11px 0}
  .hero h1 rt{font-size:9px}
  .hero p{font-size:12px;line-height:1.75;margin-bottom:16px}
  .hero-meta{gap:5px;flex-wrap:wrap}
  .hero-meta span{font-size:10px;padding:6px 9px;white-space:nowrap}
  .layout{display:block;margin-top:15px}
  .tabs{position:sticky;top:0;z-index:12;margin-bottom:12px;padding:5px;border-radius:12px;box-shadow:0 4px 14px #26362f13}
  .tab{min-height:45px;font-size:13px;padding:8px 2px}
  .panel{min-height:0;padding:23px 17px 28px;border-radius:15px}
  .section-head{gap:4px;padding-bottom:15px}
  .section-head h2{font-size:25px}
  .section-head p{font-size:11px}
  .toolbar{gap:14px;flex-wrap:wrap;padding:9px 0 2px}
  .text-button{min-height:39px;font-size:12px}
  .line{grid-template-columns:26px minmax(0,1fr) auto;grid-template-rows:auto auto;gap:6px 8px;padding:15px 1px}
  .translation-item{grid-template-columns:72px 1fr}
  .line-number{grid-column:1;grid-row:1;padding-top:12px}
  .speaker{grid-column:2;grid-row:1;justify-self:start;margin-top:0;font-size:11px;padding:7px 9px}
  .speaker rt{font-size:7px}
  .line-body{grid-column:1/-1;grid-row:2;min-width:0}
  .japanese{font-size:17px;line-height:2.15;overflow-wrap:anywhere}
  .line-translation{font-size:13px;line-height:1.8;margin-top:10px}
  .line-actions{grid-column:3;grid-row:1;flex-direction:row;gap:2px;align-items:center}
  .icon-button,.reveal-button{min-height:40px;padding:7px 6px}
  .icon-button{min-width:34px;font-size:17px}
  .reveal-button{min-width:60px;font-size:11px}
  .line.active{margin:0 -8px;padding-left:9px;padding-right:9px}
  .word-list{grid-template-columns:1fr}
  .sidebar{position:fixed;inset:auto 0 0;z-index:30;padding:8px 10px calc(8px + env(safe-area-inset-bottom));background:#f6f7f1ed;backdrop-filter:blur(12px);box-shadow:0 -5px 24px #26362f18}
  .player-card{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-areas:'heading actions' 'now actions' 'progress progress' 'speed speed' 'full full';gap:2px 8px;padding:9px 12px;border-radius:14px;box-shadow:none}
  .player-heading{grid-area:heading;gap:7px;min-width:0}
  .player-heading small{display:none}
  .player-heading strong{font-size:12px;white-space:nowrap}
  .player-icon{width:31px;height:31px;border-radius:8px;font-size:18px;flex:none}
  .now-playing{grid-area:now;min-width:0;min-height:0;margin:0 0 2px;font-size:10px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
  .progress-row{grid-area:progress;min-height:24px;margin:0}
  .progress-row input{height:20px}
  .player-actions{grid-area:actions;gap:2px;margin:0;align-self:center}
  .player-actions button{min-width:29px;min-height:37px;font-size:10px}
  .player-actions .play-button{width:42px;height:42px;min-width:42px;min-height:42px;font-size:16px;box-shadow:none}
  .speed-heading{display:none}
  .speed-options{grid-area:speed;gap:6px;margin:0}
  .speed-options button{min-height:31px;padding:4px 0;font-size:11px}
  .full-playback{grid-area:full;min-height:27px;margin:0;font-size:10px}
  .tip-card,.source-card{display:none}
  footer{padding:30px 0}
}

@media(max-width:640px) and (max-height:490px){
  .shell{padding-bottom:30px}
  .layout{display:flex;flex-direction:column}
  .sidebar{order:-1;width:100%}
  .sidebar{position:static;padding:0;background:none;box-shadow:none;backdrop-filter:none;margin-bottom:14px}
  .player-card{display:block}
  .speed-heading{display:block}
}