:root{--bg: #0b0d10;--panel: #14171c;--border: #22262d;--text-primary: #eef1f5;--text-dim: #565c66;--accent-blue: #3b82f6}*{box-sizing:border-box}html,body,#root{height:100%;margin:0}body{background:var(--bg);color:var(--text-primary);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.app-shell{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.text-input{width:100%;max-width:640px;display:flex;flex-direction:column;gap:12px}.title{font-size:28px;font-weight:600;margin:0}.subtitle{color:var(--text-dim);margin:0 0 8px}.textarea{width:100%;min-height:220px;background:var(--panel);border:1px solid var(--border);border-radius:10px;color:var(--text-primary);padding:16px;font-size:15px;line-height:1.5;resize:vertical;font-family:inherit}.textarea:focus{outline:2px solid var(--accent-blue);outline-offset:2px}.btn-primary{align-self:flex-start;background:var(--accent-blue);color:#fff;border:none;border-radius:8px;padding:10px 20px;font-size:15px;font-weight:600;cursor:pointer}.btn-primary:disabled{background:var(--border);color:var(--text-dim);cursor:not-allowed}.btn-primary:not(:disabled):hover{opacity:.9}.reader-shell{width:100%;max-width:900px;display:flex;flex-direction:column;align-items:center;gap:40px}.reader-viewport{width:100%;max-width:480px;min-height:100px;display:flex;align-items:center;justify-content:center;padding:16px 0}.scroll-window{width:100%;overflow:hidden}.scroll-track{display:flex;transition:transform .14s ease-out}.scroll-slot{flex:none;display:flex;align-items:center;justify-content:center;padding:0 2px;min-width:0}.scroll-slot .word,.scroll-slot .word-active{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}.word{font-size:clamp(16px,4vw,22px);font-weight:500;color:var(--text-dim);transition:color .12s ease,border-color .12s ease;border-bottom:3px solid transparent;padding-bottom:2px}.word-active{color:var(--text-primary);font-weight:600;border-bottom-color:var(--accent-blue)}.controls{width:100%;max-width:480px;display:flex;flex-direction:column;gap:16px}.controls-row{display:flex;align-items:center;justify-content:center;gap:16px}.mode-toggle{display:flex;background:var(--panel);border:1px solid var(--border);border-radius:999px;padding:4px;gap:4px}.mode-btn{background:none;border:none;color:var(--text-dim);font-size:13px;font-weight:600;padding:6px 16px;border-radius:999px;cursor:pointer}.mode-btn.on{background:var(--accent-blue);color:#fff}.btn-icon{background:var(--panel);border:1px solid var(--border);color:var(--text-primary);width:40px;height:40px;border-radius:50%;font-size:18px;cursor:pointer}.btn-icon:hover{border-color:var(--accent-blue)}.wpm-label{min-width:80px;color:var(--text-dim);font-size:13px}input[type=range]{flex:1;accent-color:var(--accent-blue)}.progress-label{color:var(--text-dim);font-size:13px;flex:1;text-align:left}.btn-link{background:none;border:none;color:var(--text-dim);font-size:13px;cursor:pointer;text-decoration:underline;padding:0}.btn-link:hover{color:var(--text-primary)}