:root{--ink: #111009;--paper: #f7f4ee;--red: #cc3120;--gold: #b8892a;--muted: #8a847a;--border: #e4dfd6;--green: #22c55e;--blue: #3b82f6;--white: #ffffff}*{margin:0;padding:0;box-sizing:border-box}body{background:var(--paper);color:var(--ink);font-family:DM Sans,sans-serif;font-weight:300;overflow-x:hidden}.cn{font-family:"Noto Serif SC",serif}.fraunces{font-family:Fraunces,serif}::-webkit-scrollbar{width:4px}::-webkit-scrollbar-thumb{background:var(--border);border-radius:4px}button{cursor:pointer;font-family:DM Sans,sans-serif}input,textarea{font-family:DM Sans,sans-serif}a{text-decoration:none;color:inherit}.app-layout{display:flex;flex-direction:column;min-height:100vh}.app-sb-layout{display:flex;flex-direction:row;height:100vh;overflow:hidden}.sidebar{width:240px;height:100vh;background:var(--ink);display:flex;flex-direction:column;flex-shrink:0;overflow-y:auto;overflow-x:hidden;transition:width .2s ease;scrollbar-width:none;z-index:50}.sidebar::-webkit-scrollbar{display:none}.sidebar.sb-collapsed{width:60px}.sb-logo{padding:18px 16px 14px;border-bottom:1px solid rgba(255,255,255,.07);flex-shrink:0}.sb-nav{flex:1;padding:10px 0;overflow-y:auto;scrollbar-width:none}.sb-nav::-webkit-scrollbar{display:none}.sb-link{display:flex;align-items:center;gap:11px;padding:9px 16px;color:#ffffff8c;text-decoration:none;font-size:13.5px;font-weight:400;border-left:3px solid transparent;white-space:nowrap;transition:color .15s,background .15s,border-color .15s;cursor:pointer}.sb-link:hover{color:#ffffffe0;background:#ffffff0e}.sb-link.active{color:#fff;background:#cc31202e;border-left-color:var(--red)}.sb-icon{display:flex;align-items:center;justify-content:center;flex-shrink:0;width:20px;color:inherit}.sb-label{flex:1;overflow:hidden;text-overflow:ellipsis}.sb-bottom{border-top:1px solid rgba(255,255,255,.07);padding:8px 0;flex-shrink:0}.sb-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;z-index:49}.sb-main{flex:1;display:flex;flex-direction:column;height:100vh;overflow:hidden;min-width:0}.sb-content{flex:1;overflow-y:auto;background:var(--paper)}.app-header{height:52px;background:var(--white);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 20px;gap:12px;flex-shrink:0;z-index:10}.hamburger{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border:none;background:transparent;color:var(--muted);border-radius:4px;cursor:pointer;flex-shrink:0;transition:color .15s,background .15s}.hamburger:hover{color:var(--ink);background:var(--paper)}.header-title{font-family:Fraunces,serif;font-size:17px;font-weight:700;letter-spacing:-.3px;color:var(--ink)}.header-right{margin-left:auto;display:flex;align-items:center;gap:8px}.hdr-icon-btn{display:flex;align-items:center;justify-content:center;width:32px;height:32px;border:none;background:transparent;color:var(--muted);border-radius:6px;cursor:pointer;transition:color .15s,background .15s}.hdr-icon-btn:hover{color:var(--ink);background:var(--paper)}.hdr-chat-btn{display:flex;align-items:center;gap:6px;padding:6px 14px;background:var(--red);color:#fff;border:none;border-radius:6px;font-size:13px;font-weight:500;cursor:pointer;transition:background .15s}.hdr-chat-btn:hover{background:#aa2818}.hdr-chat-btn span{display:none}.hdr-avatar{display:flex;align-items:center;gap:8px;padding:4px;border:none;background:transparent;cursor:pointer;border-radius:6px;transition:background .15s}.hdr-avatar:hover{background:var(--paper)}.hdr-avatar>span:first-child{width:28px;height:28px;border-radius:50%;background:linear-gradient(135deg,var(--red),var(--gold));display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;color:#fff}.hdr-streak{font-size:12px;color:var(--muted);white-space:nowrap}.profile-dropdown{position:absolute;top:calc(100% + 6px);right:0;min-width:180px;background:#fff;border:1px solid var(--border);border-radius:8px;box-shadow:0 8px 24px #0000001f;z-index:100;padding:8px 0}.pd-name{padding:8px 14px 2px;font-size:13px;font-weight:500;color:var(--ink)}.pd-level{padding:0 14px 8px;font-size:11px;color:var(--muted)}.pd-sep{height:1px;background:var(--border);margin:4px 0}.pd-item{display:block;width:100%;padding:9px 14px;font-size:13px;text-align:left;background:transparent;border:none;cursor:pointer;color:var(--ink);transition:background .1s}.pd-item:hover{background:var(--paper)}.pd-item.danger{color:var(--red)}@media(min-width:769px){.hdr-chat-btn span{display:inline}}@media(max-width:768px){.sidebar{position:fixed;top:0;left:0;width:240px!important;transform:translate(-100%);transition:transform .22s ease}.sidebar.sb-mobile-open{transform:translate(0)}.sidebar.sb-collapsed{width:240px!important}.page-main{padding:24px 16px}}.topbar{height:52px;background:var(--white);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 20px;gap:16px;position:sticky;top:0;z-index:50;flex-shrink:0}.logo{display:flex;align-items:center;gap:8px;text-decoration:none}.logo-cn{font-family:"Noto Serif SC",serif;font-size:22px;color:var(--red)}.logo-en{font-family:Fraunces,serif;font-size:17px;font-weight:700;color:var(--ink)}.bar-sep{width:1px;height:20px;background:var(--border)}.bar-nav{display:flex;overflow-x:auto;scrollbar-width:none}.bar-nav::-webkit-scrollbar{display:none}.bar-link{padding:0 12px;height:52px;display:flex;align-items:center;font-size:13px;color:var(--muted);border-bottom:2px solid transparent;white-space:nowrap;transition:all .15s;text-decoration:none}.bar-link:hover{color:var(--ink)}.bar-link.active{color:var(--red);border-bottom-color:var(--red)}.bar-right{margin-left:auto;display:flex;align-items:center;gap:12px;flex-shrink:0}.streak-badge{font-size:13px;color:var(--muted)}.level-badge{padding:3px 10px;background:var(--red);color:#fff;border-radius:100px;font-size:12px;font-weight:500}.avatar{width:30px;height:30px;border-radius:50%;background:linear-gradient(135deg,var(--red),var(--gold));display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:500;color:#fff;cursor:pointer}.btn-red{padding:9px 22px;background:var(--red);color:#fff;border:none;border-radius:4px;font-size:14px;transition:background .15s}.btn-red:hover{background:#aa2818}.btn-outline{padding:9px 22px;background:transparent;color:var(--ink);border:1px solid var(--border);border-radius:4px;font-size:14px;transition:border-color .15s}.btn-outline:hover{border-color:var(--ink)}.card{background:var(--white);border:1px solid var(--border);border-radius:8px;padding:24px}.card-title{font-size:11px;font-weight:500;color:var(--muted);letter-spacing:1px;text-transform:uppercase;margin-bottom:18px}.page-main{flex:1;padding:40px 48px;max-width:960px;width:100%;margin:0 auto}.page-title{font-family:Fraunces,serif;font-size:32px;font-weight:700;letter-spacing:-1px}.page-sub{font-size:14px;color:var(--muted);margin-top:4px}.yihan-av{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--red),var(--gold));display:flex;align-items:center;justify-content:center;font-family:"Noto Serif SC",serif;color:#fff;font-size:17px;flex-shrink:0}.dark-panel{background:var(--ink);color:#fff;border-radius:10px;padding:24px}.dark-panel .label{font-size:10px;color:#5a5450;letter-spacing:1.5px;text-transform:uppercase;margin-bottom:6px}.dark-panel .body-text{font-size:14px;line-height:1.65;color:#c0b9b0}.dark-panel .body-text strong{color:#fff}.skill-track{height:5px;background:var(--paper);border-radius:3px;overflow:hidden}.skill-fill{height:5px;border-radius:3px}.spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--red);border-radius:50%;animation:spin .7s linear infinite;display:inline-block}@keyframes spin{to{transform:rotate(360deg)}}@keyframes blink{0%,to{opacity:1}50%{opacity:0}}.typing-dot{width:6px;height:6px;border-radius:50%;background:var(--muted);animation:ty 1.2s infinite}.typing-dot:nth-child(2){animation-delay:.2s}.typing-dot:nth-child(3){animation-delay:.4s}@keyframes ty{0%,60%,to{opacity:.3;transform:none}30%{opacity:1;transform:translateY(-3px)}}.filter-btn{padding:6px 14px;border:1px solid var(--border);border-radius:100px;font-size:12px;color:var(--muted);background:#fff;transition:all .15s}.filter-btn:hover{border-color:var(--ink);color:var(--ink)}.filter-btn.active{background:var(--red);color:#fff;border-color:var(--red)}@media(max-width:768px){.page-main{padding:24px 16px}.topbar{padding:0 12px}}