:root{--background:#f6f3ee;--surface:#fff;--surface-soft:#fff8eb;--text:#271711;--muted:#725d52;--border:#ead8c4;--accent:#2f6f4e;--accent-dark:#21533a;--chocolate:#4d2418;--shadow:#4f241824}*{box-sizing:border-box}html,body{min-height:100%}body{background:var(--background);color:var(--text);margin:0;font-family:Arial,Hiragino Kaku Gothic ProN,Yu Gothic,sans-serif}a{color:inherit;text-decoration:none}button{font:inherit}.page{min-height:100vh;padding:40px 18px}.home-page{place-items:center;display:grid}.home-shell,.lesson-shell{width:min(100%,920px)}.home-header,.lesson-header{margin-bottom:24px}.eyebrow{color:var(--accent);letter-spacing:.14em;margin:0 0 8px;font-size:12px;font-weight:800}h1{color:var(--chocolate);margin:0;font-size:clamp(32px,6vw,56px);line-height:1.08}.lesson-list{gap:14px;display:grid}.lesson-card{border:1px solid var(--border);background:var(--surface);min-height:92px;box-shadow:0 18px 44px var(--shadow);border-radius:8px;justify-content:space-between;align-items:center;gap:16px;padding:24px;transition:border-color .16s,transform .16s;display:flex}.lesson-card:hover{border-color:var(--accent);transform:translateY(-2px)}.lesson-card span{color:var(--chocolate);font-size:clamp(22px,5vw,32px);font-weight:800}.lesson-card small{color:var(--accent);white-space:nowrap;font-weight:800}.lesson-page{justify-content:center;display:flex}.lesson-header{justify-content:space-between;align-items:flex-end;gap:20px;display:flex}.menu-link{border:1px solid var(--border);background:var(--surface);min-height:44px;color:var(--chocolate);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;padding:10px 16px;font-weight:800;display:inline-flex}.lesson-content{border:1px solid var(--border);background:var(--surface);box-shadow:0 18px 44px var(--shadow);border-radius:8px;overflow:hidden}.lesson-body{color:#2d241f;padding:clamp(22px,5vw,42px);font-size:clamp(18px,2.5vw,22px);line-height:1.85}.lesson-body p{margin:0}.lesson-body p+p{margin-top:1.25em}.lesson-body.is-japanese{color:var(--muted);font-size:clamp(16px,2.3vw,19px)}.sentence-trigger{cursor:text;-webkit-user-select:text;user-select:text;border-radius:3px}.sentence-trigger:active{background:var(--surface-soft)}.sentence-trigger:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.sentence-body{align-content:center;gap:clamp(20px,4vw,32px);min-height:300px;display:grid}.sentence-body p+p{margin-top:0}.sentence-position{color:var(--accent);letter-spacing:.08em;font-size:14px;font-weight:800}.sentence-english{color:#2d241f;font-size:clamp(22px,4vw,30px);font-weight:700;line-height:1.6}.sentence-japanese{color:var(--muted);font-size:clamp(17px,2.5vw,20px);line-height:1.8}.control-panel{grid-template-columns:1fr;gap:12px;margin:18px 0;display:grid}.speed-control{grid-column:1/-1;justify-content:flex-start;align-items:center;gap:8px;display:flex}.speed-toggle{color:var(--muted);flex:none}.speed-buttons{grid-template-columns:repeat(6,minmax(0,1fr));gap:8px;width:min(100%,520px);display:grid}.speed-button{border:1px solid var(--border);background:var(--surface-soft);min-height:36px;color:var(--chocolate);cursor:pointer;border-radius:8px;padding:8px 10px;font-weight:800}.speed-button[aria-pressed=true]{border-color:var(--accent);background:var(--accent);color:#fff}.progress-control{border:1px solid var(--border);background:var(--surface);border-radius:8px;grid-column:1/-1;gap:8px;padding:12px;display:grid}.progress-time{color:var(--muted);justify-content:space-between;font-size:13px;font-weight:800;display:flex}.progress-slider{width:100%;accent-color:var(--accent);cursor:pointer}.progress-slider:disabled{cursor:not-allowed;opacity:.5}.menu-link:hover{border-color:var(--accent);background:var(--surface-soft);transform:translateY(-1px)}.toggle-controls{grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;display:grid}.sentence-controls{gap:10px;display:grid}.sentence-navigation{grid-template-columns:minmax(0,1fr) 72px minmax(0,1fr);gap:10px;display:grid}.sentence-secondary-controls{grid-template-columns:minmax(0,1fr);gap:10px;display:grid}.control-toggle:disabled{cursor:not-allowed;opacity:.4}.lesson-image-panel{border-bottom:1px solid var(--border);background:var(--surface-soft);padding:10px}.lesson-image{border-radius:6px;width:100%;height:auto;display:block}.control-toggle{border:1px solid var(--border);background:var(--surface);min-height:52px;color:var(--chocolate);cursor:pointer;border-radius:8px;justify-content:center;align-items:center;gap:4px;padding:10px 14px;font-weight:800;display:inline-flex}.control-toggle[aria-pressed=true]{border-color:var(--accent);background:var(--accent);color:#fff}.play-toggle{font-size:22px}.language-toggle span:not(.is-active){opacity:.42}.image-toggle svg{fill:none;stroke:currentColor;stroke-linecap:round;stroke-linejoin:round;stroke-width:2px;width:28px}.image-toggle .image-slash{stroke-width:2.5px}@media (max-width:720px){.page{padding:26px 12px 294px}.lesson-header{flex-direction:column;align-items:flex-start}.menu-link{width:100%}.lesson-card{flex-direction:column;align-items:flex-start}.control-panel{z-index:20;padding:10px 12px calc(10px + env(safe-area-inset-bottom));border-top:1px solid var(--border);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#f6f3eef7;gap:8px;margin:0;position:fixed;bottom:0;left:0;right:0;box-shadow:0 -10px 30px #4f24181f}.speed-control{flex-direction:column;align-items:stretch}.speed-toggle{width:100%}.speed-buttons{grid-template-columns:repeat(3,minmax(0,1fr));width:100%}.progress-control{padding:8px 10px}.control-toggle{min-height:46px}.page:has(.sentence-controls){padding-bottom:350px}.sentence-body{min-height:260px;padding:28px 22px}}@media (max-width:420px){.speed-button{min-height:32px;padding:6px}.sentence-navigation{grid-template-columns:minmax(0,1fr) 58px minmax(0,1fr);gap:6px}.sentence-navigation-button{padding-inline:8px;font-size:13px}}