@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@300;400;500;600;700&display=swap");*{margin:0;padding:0;box-sizing:border-box}:root{--bg:#f8f9fb;--white:#ffffff;--surface:#ffffff;--surface2:#f1f3f7;--surface3:#e8ebf0;--border:#e2e5eb;--border-light:#eef0f4;--text:#1a1d26;--text-dim:#6b7280;--text-dimmer:#9ca3af;--accent:#6c5ce7;--accent-light:#ede9ff;--accent2:#8b7cf7;--green:#00b894;--green-light:#e0f7f1;--orange:#f59e0b;--orange-light:#fef3c7;--red:#ef4444;--red-light:#fee2e2;--blue:#3b82f6;--blue-light:#dbeafe;--shadow-sm:0 1px 3px rgba(0,0,0,0.04),0 1px 2px rgba(0,0,0,0.03);--shadow-md:0 4px 12px rgba(0,0,0,0.06),0 2px 4px rgba(0,0,0,0.04);--shadow-lg:0 10px 30px rgba(0,0,0,0.08),0 4px 8px rgba(0,0,0,0.04);--radius:14px;--radius-sm:10px}body{font-family:Noto Sans KR,-apple-system,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;min-height:100vh}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent2)}.nav{justify-content:space-between;padding:.7rem 2rem;background:var(--white);border-bottom:1px solid var(--border-light);position:-webkit-sticky;position:sticky;top:0;z-index:100;box-shadow:var(--shadow-sm)}.nav,.nav-logo{display:flex;align-items:center}.nav-logo{font-size:1.15rem;font-weight:700;color:var(--text);gap:.5rem}.nav-logo .logo-accent{background:linear-gradient(135deg,var(--accent),var(--green));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.nav-links{display:flex;gap:.3rem;align-items:center}.nav-links a{color:var(--text-dim);font-size:.85rem;font-weight:500;padding:.45rem 1rem;border-radius:100px;transition:all .2s}.nav-links a:hover{color:var(--text);background:var(--surface2)}.nav-links a.active{color:var(--accent);background:var(--accent-light);font-weight:600}.learn-layout{display:grid;grid-template-columns:1.3fr 1fr;height:calc(100vh - 53px);overflow:hidden}.learn-left{border-right:1px solid var(--border-light);background:var(--white)}.learn-left,.learn-right{display:flex;flex-direction:column;overflow:hidden}.learn-right{background:var(--bg)}.video-container{background:#000;aspect-ratio:16/9;width:100%;flex-shrink:0}.video-container iframe{width:100%;height:100%;border:none}.subtitle-panel{flex:1 1;overflow-y:auto;padding:.5rem}.subtitle-panel::-webkit-scrollbar{width:5px}.subtitle-panel::-webkit-scrollbar-track{background:transparent}.subtitle-panel::-webkit-scrollbar-thumb{background:var(--border);border-radius:10px}.sub-line{display:flex;gap:.8rem;padding:.65rem .8rem;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s;align-items:flex-start;border-left:3px solid transparent;margin-bottom:2px}.sub-line:hover{background:var(--surface2)}.sub-line.active{background:var(--accent-light);border-left-color:var(--accent)}.sub-line.preview{opacity:.35}.sub-time{color:var(--accent);font-size:.7rem;font-family:SF Mono,Fira Code,monospace;white-space:nowrap;min-width:34px;padding-top:3px;font-weight:500}.sub-text-ko{font-size:.92rem;margin-bottom:2px;line-height:1.55;color:var(--text)}.sub-text-vi{font-size:.8rem;color:var(--text-dim);line-height:1.4}.word-hl{background:var(--accent-light);padding:1px 5px;border-radius:5px;cursor:pointer;transition:all .2s;font-weight:500}.word-hl:hover{background:#d4ccff}.word-hl sup{font-size:.52rem;color:var(--accent);margin-left:1px;font-weight:700}.word-hl.has-hanja:after{content:"漢";font-size:.48rem;color:var(--orange);margin-left:2px;vertical-align:super;font-weight:700}.controls-bar{display:flex;align-items:center;justify-content:center;gap:.35rem;padding:.55rem 1rem;background:var(--white);border-top:1px solid var(--border-light);flex-shrink:0;flex-wrap:wrap}.ctrl-btn{display:inline-flex;align-items:center;gap:4px;padding:5px 10px;background:var(--surface2);border:1px solid var(--border);border-radius:8px;color:var(--text-dim);font-size:.72rem;cursor:pointer;transition:all .15s;-webkit-user-select:none;-moz-user-select:none;user-select:none;font-family:inherit}.ctrl-btn:hover{background:var(--accent-light);color:var(--accent);border-color:var(--accent)}.ctrl-btn:active{transform:scale(.96)}.ctrl-btn .key{display:inline-block;background:var(--white);padding:1px 5px;border-radius:4px;font-family:SF Mono,monospace;font-size:.65rem;color:var(--text);min-width:18px;text-align:center;border:1px solid var(--border);font-weight:600}.panel-tabs{display:flex;border-bottom:1px solid var(--border-light);flex-shrink:0;background:var(--white)}.panel-tab{flex:1 1;padding:.75rem 1rem;text-align:center;font-size:.82rem;color:var(--text-dim);cursor:pointer;border-bottom:2px solid transparent;transition:all .2s;font-weight:500}.panel-tab:hover{color:var(--text)}.panel-tab.active{color:var(--accent);border-bottom-color:var(--accent);font-weight:600}.panel-content{flex:1 1;overflow-y:auto;padding:1rem}.panel-content::-webkit-scrollbar{width:5px}.panel-content::-webkit-scrollbar-track{background:transparent}.panel-content::-webkit-scrollbar-thumb{background:var(--border);border-radius:10px}.panel-section{display:none}.panel-section.active{display:block}.explain-card{background:var(--white);border:1px solid var(--border-light);border-radius:var(--radius-sm);padding:1rem 1.1rem;margin-bottom:.7rem;box-shadow:var(--shadow-sm);transition:all .2s}.explain-card:hover{box-shadow:var(--shadow-md);border-color:var(--accent)}.explain-label{font-size:.65rem;color:var(--accent);text-transform:uppercase;letter-spacing:.1em;margin-bottom:.35rem;font-weight:700}.explain-word{font-size:1.05rem;font-weight:700;margin-bottom:.25rem;color:var(--text)}.explain-vi{color:var(--green);font-size:.88rem;font-weight:500;margin-bottom:.25rem}.explain-hanja{display:inline-block;background:var(--orange-light);color:#92400e;font-size:.78rem;padding:2px 8px;border-radius:5px;margin-bottom:.3rem;font-weight:500}.explain-pron{color:var(--text-dimmer);font-size:.78rem;font-family:SF Mono,monospace;margin-bottom:.35rem}.explain-note{font-size:.82rem;color:var(--text-dim);line-height:1.55}.explain-grammar-title{font-size:1rem;font-weight:700;margin-bottom:.25rem}.explain-grammar-vi{color:var(--green);font-size:.88rem;font-weight:500;margin-bottom:.35rem}.explain-grammar-text{font-size:.85rem;color:var(--text-dim);line-height:1.55;margin-bottom:.5rem}.explain-examples{list-style:none;padding:0}.explain-examples li{font-size:.82rem;color:var(--text-dim);padding:.2rem 0}.explain-examples li:before{content:"•";color:var(--accent);margin-right:.5rem;font-weight:700}.save-word-btn{display:inline-flex;align-items:center;gap:4px;padding:4px 12px;background:transparent;border:1px solid var(--border);border-radius:100px;color:var(--text-dim);font-size:.72rem;cursor:pointer;margin-top:.5rem;transition:all .2s;font-family:inherit}.save-word-btn:hover{color:var(--green)}.save-word-btn.saved,.save-word-btn:hover{border-color:var(--green);background:var(--green-light)}.save-word-btn.saved{color:#065f46;font-weight:600}.tutor-section{display:flex;flex-direction:column;height:100%}.tutor-header{font-size:.78rem;color:var(--green);padding:.8rem 0;display:flex;align-items:center;gap:.4rem;font-weight:600}.tutor-messages{flex:1 1;overflow-y:auto;display:flex;flex-direction:column;gap:.6rem;padding-bottom:.5rem}.tutor-messages::-webkit-scrollbar{width:5px}.tutor-messages::-webkit-scrollbar-track{background:transparent}.tutor-messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:10px}.chat-bubble{padding:.7rem 1rem;border-radius:16px;font-size:.85rem;max-width:88%;line-height:1.55;animation:fadeIn .3s ease}@keyframes fadeIn{0%{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.chat-bubble.user{background:var(--accent);color:white;align-self:flex-end;border-bottom-right-radius:6px}.chat-bubble.ai{background:var(--white);border:1px solid var(--border-light);align-self:flex-start;border-bottom-left-radius:6px;box-shadow:var(--shadow-sm);color:var(--text)}.chat-bubble.ai.typing:after{content:"...";animation:dots 1.5s infinite}@keyframes dots{0%,20%{content:"."}40%{content:".."}60%,to{content:"..."}}.tutor-input-area{display:flex;gap:.5rem;padding-top:.8rem;border-top:1px solid var(--border-light);flex-shrink:0}.tutor-input{flex:1 1;background:var(--white);border:1px solid var(--border);border-radius:12px;padding:.65rem 1rem;color:var(--text);font-size:.85rem;font-family:inherit;outline:none;transition:all .2s;box-shadow:var(--shadow-sm)}.tutor-input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}.tutor-input::placeholder{color:var(--text-dimmer)}.tutor-send{background:var(--accent);border:none;border-radius:12px;padding:.65rem 1.3rem;color:white;font-size:.85rem;font-weight:600;cursor:pointer;transition:all .2s;font-family:inherit;box-shadow:0 2px 8px rgba(108,92,231,.3)}.tutor-send:hover{background:#5a4bd4}.toggle-group{display:flex;gap:0;margin-bottom:.8rem;background:var(--surface2);border-radius:100px;padding:3px}.toggle-btn{padding:.35rem .9rem;font-size:.72rem;background:transparent;border:none;color:var(--text-dim);cursor:pointer;transition:all .2s;border-radius:100px;font-family:inherit;font-weight:500}.toggle-btn.active{background:var(--white);color:var(--accent);box-shadow:var(--shadow-sm);font-weight:600}.home-wrap{max-width:1100px;margin:0 auto;padding:2rem}.home-top{display:flex;align-items:center;justify-content:space-between;gap:2rem;margin-bottom:2.5rem;flex-wrap:wrap}.home-top-left h1{font-size:1.6rem;font-weight:700;margin-bottom:.3rem}.home-top-left p{color:var(--text-dim);font-size:.9rem}.highlight{background:linear-gradient(135deg,var(--accent),var(--green));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.url-input-compact{display:flex;gap:.5rem;flex:1 1;min-width:300px;max-width:480px}.url-input-compact input{flex:1 1;background:var(--white);border:1px solid var(--border);border-radius:12px;padding:.7rem 1rem;color:var(--text);font-size:.85rem;font-family:inherit;outline:none;transition:all .2s;box-shadow:var(--shadow-sm)}.url-input-compact input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-light)}.url-input-compact input::placeholder{color:var(--text-dimmer)}.url-input-compact button{background:var(--accent);border:none;border-radius:12px;padding:.7rem 1.4rem;color:white;font-size:.85rem;font-weight:600;cursor:pointer;font-family:inherit;white-space:nowrap;transition:all .2s;box-shadow:0 2px 8px rgba(108,92,231,.3)}.url-input-compact button:hover{background:#5a4bd4}.section-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:1rem}.section-header h2{font-size:1.05rem;font-weight:700;color:var(--text)}.add-btn{background:var(--white);border:1px solid var(--border);border-radius:100px;padding:.4rem 1.1rem;color:var(--text-dim);font-size:.78rem;cursor:pointer;font-family:inherit;transition:all .2s;box-shadow:var(--shadow-sm);font-weight:500}.add-btn:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-light)}.ch-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));grid-gap:1rem;gap:1rem;margin-bottom:2.5rem}.ch-card{background:var(--white);border:1px solid var(--border-light);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:all .25s;box-shadow:var(--shadow-sm)}.ch-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px);border-color:var(--accent)}.ch-thumb{width:100%;aspect-ratio:16/9;object-fit:cover;display:block;background:var(--surface2)}.ch-info{padding:.85rem 1rem}.ch-info h3{font-size:.88rem;font-weight:600;margin-bottom:.2rem;display:flex;align-items:center;gap:.4rem}.ch-info p{font-size:.75rem;color:var(--text-dim)}.ch-badge{display:inline-block;padding:1px 7px;border-radius:100px;font-size:.58rem;font-weight:700}.ch-badge-level{background:var(--green-light);color:#065f46}.ch-badge-type{background:var(--accent-light);color:var(--accent)}.video-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));grid-gap:1rem;gap:1rem}.vid-card{background:var(--white);border:1px solid var(--border-light);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:all .25s;box-shadow:var(--shadow-sm)}.vid-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-3px);border-color:var(--accent)}.vid-thumb-wrap{position:relative;width:100%;aspect-ratio:16/9;background:var(--surface2);overflow:hidden}.vid-thumb-wrap img{width:100%;height:100%;object-fit:cover;display:block}.vid-duration{position:absolute;bottom:8px;right:8px;background:rgba(0,0,0,.75);padding:2px 7px;border-radius:5px;font-size:.68rem;color:white;font-family:monospace;font-weight:600}.vid-info{padding:.8rem 1rem}.vid-info h4{font-size:.85rem;font-weight:500;margin-bottom:.25rem;line-height:1.35;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;color:var(--text)}.vid-info p{font-size:.72rem;color:var(--text-dim)}.add-channel-new{background:var(--white);border:2px dashed var(--border);border-radius:var(--radius);display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:180px;cursor:pointer;transition:all .2s;color:var(--text-dim)}.add-channel-new:hover{border-color:var(--accent);color:var(--accent);background:var(--accent-light)}.add-channel-new .plus{font-size:2rem;margin-bottom:.3rem}.add-channel-new span{font-size:.82rem;font-weight:500}.content-tabs{display:flex;gap:.4rem;margin-bottom:1.2rem;flex-wrap:wrap}.content-tab{padding:.4rem 1rem;border-radius:100px;font-size:.8rem;background:var(--white);border:1px solid var(--border);color:var(--text-dim);cursor:pointer;transition:all .2s;font-family:inherit;font-weight:500;box-shadow:var(--shadow-sm)}.content-tab:hover{border-color:var(--accent);color:var(--accent)}.content-tab.active{background:var(--accent);border-color:var(--accent);color:white;box-shadow:0 2px 8px rgba(108,92,231,.3)}.vocab-container{max-width:900px;margin:0 auto;padding:2rem}.vocab-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:2rem}.vocab-header h1{font-size:1.4rem;font-weight:700}.vocab-count{color:var(--text-dim);font-size:.85rem;font-weight:500}.vocab-list{display:flex;flex-direction:column;gap:.7rem}.vocab-item{background:var(--white);border:1px solid var(--border-light);border-radius:var(--radius);padding:1.1rem 1.3rem;display:flex;justify-content:space-between;align-items:flex-start;box-shadow:var(--shadow-sm);transition:all .2s}.vocab-item:hover{box-shadow:var(--shadow-md);border-color:var(--accent)}.vocab-word{font-size:1.1rem;font-weight:700;margin-bottom:.15rem}.vocab-meaning{color:var(--green);font-size:.88rem;font-weight:500;margin-bottom:.15rem}.vocab-hanja{display:inline-block;background:var(--orange-light);color:#92400e;font-size:.78rem;padding:1px 7px;border-radius:5px;margin-bottom:.3rem;font-weight:500}.vocab-source{font-size:.75rem;color:var(--text-dimmer);font-style:italic}.vocab-delete{background:var(--white);border:1px solid var(--border);border-radius:100px;color:var(--text-dim);padding:5px 14px;font-size:.72rem;cursor:pointer;transition:all .2s;font-family:inherit;font-weight:500}.vocab-delete:hover{border-color:var(--red);color:var(--red);background:var(--red-light)}.empty-state{text-align:center;padding:4rem 2rem;color:var(--text-dim)}.empty-state .icon{font-size:3rem;margin-bottom:1rem}.empty-state p{font-size:.95rem}.shortcuts-help{position:fixed;bottom:1rem;right:1rem;background:var(--white);border:1px solid var(--border);border-radius:100px;padding:.45rem 1rem;font-size:.7rem;color:var(--text-dim);cursor:pointer;z-index:50;box-shadow:var(--shadow-md);transition:all .2s;font-weight:500}.shortcuts-help:hover{border-color:var(--accent);color:var(--accent)}@media (max-width:900px){.learn-layout{grid-template-columns:1fr;height:auto}.learn-left{border-right:none;border-bottom:1px solid var(--border-light)}.learn-right{height:50vh}.home-top{flex-direction:column;align-items:flex-start}.url-input-compact{max-width:100%;min-width:auto}}.channels-section{margin-bottom:2.5rem}.onboarding-overlay{position:fixed;inset:0;background:rgba(255,255,255,.97);z-index:200;display:flex;align-items:center;justify-content:center;animation:fadeIn .3s ease}.onboarding{max-width:600px;width:100%;padding:2rem;text-align:center}.onboarding h1{font-size:1.8rem;font-weight:700;margin-bottom:.5rem}.onboarding p{color:var(--text-dim);margin-bottom:2rem;font-size:.95rem}.interest-grid{display:grid;grid-template-columns:repeat(4,1fr);grid-gap:.7rem;gap:.7rem;margin-bottom:2rem}.interest-btn{display:flex;flex-direction:column;align-items:center;gap:.4rem;padding:1rem .5rem;background:var(--white);border:2px solid var(--border);border-radius:14px;cursor:pointer;transition:all .2s;font-family:inherit}.interest-btn.selected,.interest-btn:hover{border-color:var(--accent);background:var(--accent-light)}.interest-btn.selected{box-shadow:0 0 0 2px var(--accent)}.interest-btn .emoji{font-size:1.8rem}.interest-btn .label{font-size:.78rem;font-weight:600;color:var(--text)}.onboarding-next{background:var(--accent);border:none;border-radius:100px;padding:.8rem 3rem;color:white;font-size:.95rem;font-weight:600;cursor:pointer;font-family:inherit;transition:all .2s;box-shadow:0 4px 15px rgba(108,92,231,.3)}.onboarding-next:hover{background:#5a4bd4;transform:translateY(-1px)}.onboarding-next:disabled{opacity:.4;cursor:not-allowed;transform:none}.onboarding-skip{display:block;margin:1rem auto 0;background:none;border:none;color:var(--text-dimmer);font-size:.82rem;cursor:pointer;font-family:inherit}.onboarding-skip:hover{color:var(--text-dim)}.rec-section{background:linear-gradient(135deg,var(--accent-light),var(--green-light));border-radius:16px;padding:1.5rem;margin-bottom:2rem}.rec-section h3{font-size:.95rem;font-weight:700;margin-bottom:.8rem;color:var(--text)}.rec-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));grid-gap:.8rem;gap:.8rem}.rec-card{background:var(--white);border:1px solid var(--border-light);border-radius:12px;padding:.8rem;display:flex;align-items:center;gap:.7rem;cursor:pointer;transition:all .2s;box-shadow:var(--shadow-sm)}.rec-card:hover{box-shadow:var(--shadow-md);border-color:var(--accent)}.rec-card.added{border-color:var(--green);background:var(--green-light)}.rec-avatar{width:40px;height:40px;border-radius:50%;background:var(--surface2);display:flex;align-items:center;justify-content:center;font-size:1.2rem;flex-shrink:0}.rec-info h4{font-size:.8rem;font-weight:600;line-height:1.2}.rec-info p{font-size:.68rem;color:var(--text-dim)}.rec-add-btn{margin-left:auto;background:var(--accent);border:none;border-radius:100px;padding:3px 10px;color:white;font-size:.68rem;font-weight:600;cursor:pointer;white-space:nowrap;font-family:inherit;transition:all .2s}.rec-add-btn:hover{background:#5a4bd4}.rec-add-btn.added{background:var(--green)}