:root{--brand:#00a67e;--brand-deep:#008f6c;--brand-soft:#e6f7f1;--primary:#111111;--bg:#f7f7f7;--surface:#ffffff;--ink:#222222;--muted:#6a6a6a;--line:#dddddd;--radius:14px;--shadow:0 1px 3px rgba(0,0,0,0.06);--font:"PingFang SC","Noto Sans SC","Segoe UI","Microsoft YaHei",sans-serif;--tabbar-h:64px}*{box-sizing:border-box}body,html{margin:0;padding:0;min-height:100%;background:var(--bg);color:var(--ink);font-family:var(--font)}a{color:inherit;text-decoration:none}button,input,textarea{font:inherit}.shell{width:min(1080px,calc(100% - 32px));margin:0 auto}.shell-main{padding-bottom:calc(var(--tabbar-h) + 24px + env(safe-area-inset-bottom, 0px))}.topbar{position:-webkit-sticky;position:sticky;top:0;z-index:20;background:rgba(255,255,255,.92);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}.topbar-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:56px}.brand{font-weight:700;font-size:1.1rem;letter-spacing:.02em;color:var(--ink)}.nav{display:flex;flex-wrap:wrap;gap:10px 16px;color:var(--muted);font-size:.92rem}.nav a:hover{color:var(--brand-deep)}.topbar-actions{display:flex;gap:8px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;border:0;border-radius:12px;padding:.65rem 1.1rem;background:var(--primary);color:#fff;cursor:pointer;transition:transform .15s ease,opacity .15s ease}.btn:hover{transform:translateY(-1px)}.btn.ghost{background:transparent;color:var(--ink);border:1px solid var(--line)}.btn:disabled{opacity:.55;cursor:not-allowed;transform:none}.cta-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}.feed{display:grid;grid-gap:18px;gap:18px;padding:20px 0 32px}.mentors-hero{padding:8px 0 4px}.mentors-hero h1{margin:0 0 10px;font-size:clamp(1.45rem,5vw,2.1rem);line-height:1.25;letter-spacing:-.02em}#mentor-list h2,.discover-grid h2,.feed>section>h2{margin:0 0 6px;font-size:1.15rem}.rail{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:10px;gap:10px;margin-top:10px}.rail-item{display:grid;grid-gap:4px;gap:4px;padding:14px;background:#fff;border:1px solid var(--line);border-radius:12px}.rail-item span{color:var(--muted);font-size:.85rem}.mentor-grid{display:grid;grid-gap:10px;gap:10px;margin-top:10px}.mentor-card{display:flex;gap:12px;padding:14px;align-items:flex-start}.mentor-card img{width:56px;height:56px;border-radius:50%;object-fit:cover;background:#eee}.mentor-about{margin:6px 0 0;color:var(--muted);font-size:.88rem;line-height:1.45}.post-card{padding:18px 18px 14px}.post-head{display:flex;gap:12px;align-items:center;margin-bottom:12px}.avatar{width:42px;height:42px;border-radius:50%;object-fit:cover;background:#ddd}.post-meta{display:flex;flex-direction:column;gap:2px}.post-meta strong{font-size:.98rem}.post-meta span{color:var(--muted);font-size:.82rem}.post-text{white-space:pre-wrap;line-height:1.65;font-size:1.02rem}.post-media{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));grid-gap:8px;gap:8px;margin-top:12px}.post-media img,.post-media video{width:100%;border-radius:10px;max-height:360px;object-fit:cover;background:#eee}.post-actions{display:flex;gap:16px;margin-top:14px;padding-top:12px;border-top:1px solid var(--line);color:var(--muted);font-size:.9rem}.post-actions button{background:none;border:0;color:inherit;cursor:pointer;padding:0}.post-actions button.liked{color:var(--brand);font-weight:600}.auth-box{width:min(420px,calc(100% - 32px));margin:64px auto;padding:28px}.auth-box h1{margin:0 0 8px;font-size:1.5rem}.auth-box p{margin:0 0 20px;color:var(--muted)}.field{display:grid;grid-gap:6px;gap:6px;margin-bottom:14px}.field input,.field textarea{border:1px solid var(--line);border-radius:10px;padding:.75rem .9rem;background:#fff}.muted{color:var(--muted)}.list-row{display:flex;align-items:center;gap:12px;padding:12px 14px;border-bottom:1px solid var(--line)}.list-row:last-child{border-bottom:0}.panel{padding:16px}.hero-title{font-size:clamp(1.45rem,3vw,2rem);margin:12px 0 8px;letter-spacing:-.02em}.comment{padding:12px 0;border-bottom:1px solid var(--line)}.comment:last-child{border-bottom:0}.pub-ico{width:40px;height:40px;border-radius:10px;background:var(--brand-soft);color:var(--brand-deep);display:inline-flex;align-items:center;justify-content:center;font-weight:700}.tabbar{position:fixed;left:0;right:0;bottom:0;z-index:40;display:none;height:calc(var(--tabbar-h) + env(safe-area-inset-bottom, 0px));padding:6px 8px calc(6px + env(safe-area-inset-bottom, 0px));background:#fff;border-top:1px solid var(--line);justify-content:space-around;align-items:flex-start}.tabbar-item{flex:1 1;display:flex;flex-direction:column;align-items:center;gap:2px;color:var(--muted);font-size:.72rem;min-width:0;padding-top:4px}.tabbar-item svg{width:22px;height:22px}.tabbar-item.is-active{color:var(--brand);font-weight:700}.tabbar-plus-circle{width:44px;height:44px;margin-top:-16px;border-radius:50%;background:var(--primary);color:#fff;display:inline-flex;align-items:center;justify-content:center;box-shadow:0 6px 16px rgba(0,0,0,.18)}.tabbar-plus-circle svg{width:22px;height:22px}.tabbar-plus.is-active .tabbar-plus-circle{background:var(--brand)}.tabbar-plus small{margin-top:2px}@media (max-width:860px){.nav{display:none}.tabbar{display:flex}}@media (min-width:861px){.shell-main{padding-bottom:48px}}