:root{--bg:#0a0a0f;--fg:#f0f0f5;--card-bg:#ffffff0a;--card-border:#ffffff14;--card-hover:#ffffff14;--purple:#8b5cf6;--pink:#d946ef;--teal:#10b981;--amber:#f59e0b;--red:#ef4444;--blue:#3b82f6;--muted:#ffffff80;--smooth:all .3s cubic-bezier(.4,0,.2,1)}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{background:var(--bg);color:var(--fg);background-image:radial-gradient(circle at 15% 20%,#8b5cf60f 0%,#0000 50%),radial-gradient(circle at 85% 80%,#d946ef0a 0%,#0000 50%);min-height:100vh;font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;overflow-x:hidden}a{color:inherit;text-decoration:none}.nav{z-index:100;-webkit-backdrop-filter:blur(16px);border-bottom:1px solid var(--card-border);background:#0a0a0fcc;padding:1rem 2rem;position:sticky;top:0}.nav-inner{justify-content:space-between;align-items:center;max-width:1100px;margin:0 auto;display:flex}.nav-brand{background:linear-gradient(135deg,var(--purple),var(--pink));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:1.35rem;font-weight:800}.nav-streak{color:var(--muted);align-items:center;gap:.4rem;font-size:.85rem;display:flex}.nav-back{color:var(--muted);cursor:pointer;transition:var(--smooth);font-size:.85rem}.nav-back:hover{color:var(--fg)}.container{max-width:1100px;margin:0 auto;padding:2rem}.card{background:var(--card-bg);border:1px solid var(--card-border);transition:var(--smooth);border-radius:20px}.grad{background:linear-gradient(135deg,var(--purple),var(--pink));-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text}.btn{cursor:pointer;transition:var(--smooth);border:none;border-radius:14px;justify-content:center;align-items:center;gap:.5rem;padding:10px 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auto;display:flex}.unit-node{padding:.5rem 0;position:relative}.unit-node:before{content:"";background:var(--card-border);width:3px;position:absolute;top:0;bottom:0;left:35px}.unit-node:first-child:before{top:50%}.unit-node:last-child:before{bottom:50%}.unit-node-link{transition:var(--smooth);border-radius:16px;align-items:center;gap:1.25rem;padding:1rem;display:flex}a.unit-node-link:hover{background:#ffffff0a}.unit-icon-ring{z-index:2;border:3px solid var(--purple);background:var(--bg);width:56px;min-width:56px;height:56px;transition:var(--smooth);border-radius:50%;justify-content:center;align-items:center;display:flex;position:relative}.unit-icon-ring.locked{border-color:var(--card-border);opacity:.5}.unit-icon{font-size:1.5rem}.unit-active .unit-icon-ring{box-shadow:0 0 20px #8b5cf64d}.unit-complete .unit-icon-ring{border-color:var(--teal)}.unit-info{flex:1}.unit-title{margin-bottom:.2rem;font-size:1.05rem;font-weight:700}.unit-desc{color:var(--muted);font-size:.8rem;line-height:1.4}.unit-progress-text{color:var(--muted);margin-top:.25rem;font-size:.7rem;display:block}.lesson-list{flex-direction:column;gap:.5rem;max-width:600px;margin:0 auto;display:flex}.lesson-row{border:1px solid var(--card-border);transition:var(--smooth);border-radius:14px;overflow:hidden}.lesson-available:hover{background:#ffffff08;border-color:#ffffff26}.lesson-done{background:#10b9810d;border-color:#10b98126}.lesson-locked{opacity:.5}.lesson-row-inner{align-items:center;gap:1rem;padding:1rem 1.25rem;display:flex}a.lesson-row-inner{color:inherit;text-decoration:none}.lesson-number{color:#fff;border-radius:50%;justify-content:center;align-items:center;width:36px;min-width:36px;height:36px;font-size:.85rem;font-weight:800;display:flex}.lesson-title{font-size:.95rem;font-weight:600}.lesson-phrases{color:var(--muted);font-size:.75rem}.lesson-arrow{color:var(--muted);margin-left:auto;font-size:.85rem;font-weight:600}.lesson-engine{max-width:580px;margin:0 auto}.lesson-progress-bar{justify-content:space-between;margin-bottom:.75rem;display:flex}.lesson-step-dot{flex-direction:column;align-items:center;gap:.25rem;display:flex}.step-dot-label{color:var(--muted);transition:var(--smooth);font-size:.7rem;font-weight:600}.step-active .step-dot-label{color:var(--purple)}.step-done .step-dot-label{color:var(--teal)}.step-container{text-align:center;flex-direction:column;align-items:center;display:flex}.step-label{margin-bottom:.5rem;font-size:1.1rem;font-weight:700}.learn-card{background:linear-gradient(135deg,#8b5cf61a,#d946ef0d);border:1px solid #8b5cf633;border-radius:20px;width:100%;margin:1rem 0;padding:2.5rem 2rem}.learn-romanized{margin-bottom:.5rem;font-size:1.8rem;font-weight:700}.learn-script{color:var(--muted);margin-bottom:.75rem;font-size:1.1rem}.learn-english{color:#ffffffb3;font-size:1rem}.dialogue-box{text-align:left;flex-direction:column;gap:.5rem;width:100%;display:flex}.dialogue-line{cursor:pointer;transition:var(--smooth);border:1px solid #0000;border-radius:14px;padding:12px 16px}.dialogue-line:hover{background:#ffffff0a}.speaker-a{border-left:3px solid var(--purple)}.speaker-b{border-left:3px solid var(--teal)}.speaker-badge{color:#fff;background:var(--purple);border-radius:50%;justify-content:center;align-items:center;width:28px;min-width:28px;height:28px;font-size:.75rem;font-weight:800;display:flex}.speaker-b .speaker-badge{background:var(--teal)}.translation-reveal{color:var(--amber);margin-top:.5rem;padding-left:2.5rem;font-size:.85rem;font-style:italic}.quiz-card{text-align:center;width:100%}.quiz-prompt{margin:.75rem 0 1.5rem;font-size:1.6rem;font-weight:700}.quiz-options{flex-direction:column;gap:.5rem;display:flex}.quiz-option{border:1px solid var(--card-border);width:100%;color:var(--fg);cursor:pointer;text-align:left;transition:var(--smooth);background:#ffffff08;border-radius:14px;padding:14px 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18px;font-family:inherit;font-size:.95rem}.use-option:hover:not(:disabled){border-color:var(--pink);background:#d946ef14}.lesson-complete{text-align:center;flex-direction:column;align-items:center;padding-top:3rem;display:flex}.complete-celebration{margin-bottom:2rem}.complete-icon{margin-bottom:1rem;font-size:4rem;animation:1.5s infinite pulse;display:block}.complete-stats{flex-wrap:wrap;justify-content:center;gap:1.5rem;display:flex}.stat-box{background:var(--card-bg);border:1px solid var(--card-border);border-radius:16px;flex-direction:column;align-items:center;min-width:100px;padding:1.25rem 2rem;display:flex}.stat-value{font-size:1.8rem;font-weight:800}.stat-label{color:var(--muted);margin-top:.25rem;font-size:.75rem}@keyframes fadeIn{0%{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}@keyframes slideUp{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{opacity:1}50%{opacity:.5}}.fade-in{animation:.5s forwards fadeIn}@media (max-width:768px){.container{padding:1rem}.learn-romanized{font-size:1.4rem}.quiz-prompt{font-size:1.3rem}.complete-stats{flex-direction:column}.unit-node-link{gap:.75rem}.lesson-progress-bar{gap:.25rem}.step-dot-label{font-size:.6rem}}