*,:before,:after{box-sizing:border-box;margin:0;padding:0}:root{--primary:#2563eb;--primary-dark:#1d4ed8;--primary-light:#dbeafe;--danger:#dc2626;--bg:#f9fafb;--surface:#fff;--border:#e5e7eb;--text:#111827;--text-sub:#6b7280;--bubble-mine:#2563eb;--bubble-mine-text:#fff;--bubble-theirs:#fff;--bubble-theirs-text:#111827;--nav-h:60px;--header-h:56px;--radius:12px;--radius-sm:8px}@media (prefers-color-scheme:dark){:root{--bg:#0f172a;--surface:#1e293b;--border:#334155;--text:#f1f5f9;--text-sub:#94a3b8;--bubble-theirs:#1e293b;--bubble-theirs-text:#f1f5f9}}html{background:var(--bg);height:100dvh;color:var(--text);-webkit-tap-highlight-color:transparent;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:15px;overflow:hidden}body{background:var(--bg);height:100dvh;overflow:hidden}#root{height:100dvh;overflow:hidden}a{color:var(--primary);text-decoration:none}button{cursor:pointer;font:inherit;color:inherit;background:0 0;border:none}input,textarea{font:inherit;color:inherit;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);outline:none;width:100%;padding:10px 12px;font-size:16px;transition:border-color .15s}input:focus,textarea:focus{border-color:var(--primary)}.app-layout{background:var(--bg);flex-direction:column;width:100%;max-width:600px;height:100dvh;margin:0 auto;display:flex;position:relative;overflow:hidden}.main-content{min-height:0;padding-bottom:calc(var(--nav-h) + env(safe-area-inset-bottom));-webkit-overflow-scrolling:touch;flex:1;overflow:hidden auto}.page{flex-direction:column;min-height:100%;display:flex}.page-full{flex-direction:column;height:100dvh;display:flex;overflow:hidden}.bottom-nav{width:100%;max-width:600px;height:calc(var(--nav-h) + env(safe-area-inset-bottom));background:var(--surface);border-top:1px solid var(--border);z-index:100;padding-bottom:env(safe-area-inset-bottom);display:flex;position:fixed;bottom:0;left:50%;transform:translate(-50%)}.nav-item{color:var(--text-sub);flex-direction:column;flex:1;justify-content:center;align-items:center;gap:2px;padding:6px 0;font-size:11px;text-decoration:none;transition:color .15s;display:flex}.nav-item.active{color:var(--primary)}.nav-icon{font-size:22px;line-height:1;display:inline-flex;position:relative}.nav-badge{background:var(--danger);color:#fff;border-radius:10px;justify-content:center;align-items:center;min-width:16px;height:16px;padding:0 5px;font-size:10px;font-weight:700;line-height:1;display:flex;position:absolute;top:-4px;right:-8px}.page-header{height:var(--header-h);background:var(--surface);border-bottom:1px solid var(--border);z-index:10;justify-content:space-between;align-items:center;padding:0 16px;display:flex;position:sticky;top:0}.page-header 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img{object-fit:cover;width:100%;height:100%}.avatar-badge{background:var(--primary);color:#fff;border-radius:4px;padding:1px 3px;font-size:9px;position:absolute;bottom:0;right:0}.online-dot{border:2px solid var(--surface);background:#22c55e;border-radius:50%;width:10px;height:10px;position:absolute;bottom:1px;right:1px}.list-section-title{color:var(--text-sub);text-transform:uppercase;letter-spacing:.05em;background:var(--bg);padding:8px 16px 4px;font-size:12px;font-weight:600}.badge{background:var(--danger);color:#fff;text-align:center;border-radius:10px;min-width:18px;padding:1px 6px;font-size:12px;font-weight:600}.empty-state{color:var(--text-sub);flex-direction:column;justify-content:center;align-items:center;gap:8px;padding:60px 20px;display:flex}.empty-hint{font-size:13px}.btn-primary{background:var(--primary);color:#fff;border-radius:var(--radius-sm);padding:10px 18px;font-weight:500;transition:background 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var(--border);align-items:center;gap:16px;padding:24px 16px;display:flex}.profile-avatar{background:var(--primary-light);width:72px;height:72px;color:var(--primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:28px;font-weight:700;display:flex;overflow:hidden}.profile-avatar img{object-fit:cover;width:100%;height:100%}.profile-info{flex:1}.profile-info h3{font-size:18px;font-weight:600}.profile-uid{color:var(--text-sub);margin-top:4px;font-size:13px}.profile-username{color:var(--text-sub);margin-top:2px;font-size:13px}.settings-list{background:var(--surface);border-top:1px solid var(--border);border-bottom:1px solid var(--border);margin-top:12px}.settings-item{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;padding:14px 16px;font-size:15px;display:flex}.settings-item:last-child{border-bottom:none}.settings-value{color:var(--text-sub);font-size:13px}.profile-actions{padding:20px 16px}.logout-confirm{background:var(--bg-card);border:1px solid var(--danger);border-radius:12px;padding:16px}.logout-confirm p{color:var(--text-main);text-align:center;margin:0 0 12px;font-size:15px}.logout-confirm .btn-group{justify-content:center}@media (width<=359px){html{font-size:13px}.msg-bubble-wrap{max-width:86%}.icon-btn{width:28px;height:28px;font-size:15px}.chat-input-area{gap:3px;padding:5px}.chat-input{padding:6px 10px;font-size:14px}.btn-send{padding:7px 10px;font-size:13px}.nav-icon{font-size:19px}.nav-item{font-size:10px}.page-header h2{font-size:15px}.list-item{gap:8px;padding:9px 10px}.avatar{width:40px;height:40px;font-size:15px}.auth-card{padding:24px 16px}.auth-logo-icon{font-size:38px}.auth-logo h1{font-size:20px}.btn-group{flex-wrap:wrap;justify-content:flex-end;gap:4px}.btn-sm{padding:4px 8px;font-size:12px}.msg-image{max-width:180px}.msg-file-name{max-width:100px}}@media (width>=360px) and (width<=380px){html{font-size:14px}.msg-bubble-wrap{max-width:82%}.icon-btn{width:30px;height:30px;font-size:16px}.chat-input-area{gap:4px;padding:6px}.nav-icon{font-size:20px}.nav-item{font-size:10px}.page-header h2{font-size:16px}.list-item{gap:10px;padding:10px 12px}}@media (width>=381px) and (width<=430px){html{font-size:15px}}@media (width>=431px){html{font-size:15px}.auth-card{max-width:400px}.msg-image{max-width:260px;max-height:320px}}@media (width>=601px){html{font-size:15px}.auth-card{max-width:420px}}@media (height<=500px) and (orientation:landscape){:root{--header-h:44px;--nav-h:48px}.auth-logo{margin-bottom:12px}.auth-logo-icon{font-size:32px}.auth-logo h1{font-size:20px}.auth-card{padding:16px 20px}.form-group{margin-bottom:8px}.chat-messages{gap:6px;padding:8px 8px 4px}}.settings-item-link{cursor:pointer}.settings-item-link:active{background:var(--bg)}.settings-arrow{color:var(--text-sub);font-size:18px;font-weight:300}.about-body{padding-bottom:16px}.about-hero{text-align:center;background:var(--surface);border-bottom:1px solid var(--border);padding:32px 24px 24px}.about-hero-icon{margin-bottom:8px;font-size:52px;line-height:1}.about-hero-title{margin-bottom:4px;font-size:24px;font-weight:700}.about-hero-sub{color:var(--primary);margin-bottom:12px;font-size:14px;font-weight:500}.about-hero-desc{color:var(--text-sub);font-size:14px;line-height:1.7}.about-section{padding:20px 16px 4px}.about-section-title{color:var(--text);margin-bottom:12px;font-size:15px;font-weight:700}.about-card{background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);margin-bottom:10px;padding:14px 16px}.about-card-highlight{border-color:var(--primary);background:var(--primary-light)}@media (prefers-color-scheme:dark){.about-card-highlight{background:#1e3a5f;border-color:#2563eb}}.about-card-lead{color:var(--text);margin-bottom:8px;font-size:15px;font-weight:600}.about-card-label{color:var(--primary);text-transform:uppercase;letter-spacing:.05em;margin-bottom:8px;font-size:12px;font-weight:600}.about-card-text{color:var(--text-sub);font-size:14px;line-height:1.7}.about-compare{gap:8px;margin-bottom:10px;display:flex}.about-compare-col{border-radius:var(--radius);flex:1;padding:12px}.about-compare-col.bad{background:#fef2f2;border:1px solid #fecaca}.about-compare-col.good{background:#f0fdf4;border:1px solid #bbf7d0}@media (prefers-color-scheme:dark){.about-compare-col.bad{background:#450a0a;border-color:#991b1b}.about-compare-col.good{background:#14532d;border-color:#166534}}.about-compare-label{margin-bottom:8px;font-size:12px;font-weight:700}.about-compare-col.bad .about-compare-label{color:#dc2626}.about-compare-col.good 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var(--border);display:flex}.about-privacy-row:last-child{border-bottom:none}.about-privacy-row.header{background:var(--bg)}.about-privacy-col{border-right:1px solid var(--border);color:var(--text-sub);flex:1;padding:10px 14px;font-size:13px;line-height:1.5}.about-privacy-col:last-child{border-right:none}.about-privacy-row.header .about-privacy-col{color:var(--text);font-size:12px;font-weight:700}.about-privacy-row:not(.header) .about-privacy-col:first-child{color:var(--text-sub)}.about-privacy-row:not(.header) .about-privacy-col:last-child{color:#16a34a;font-weight:500}@media (prefers-color-scheme:dark){.about-privacy-row:not(.header) .about-privacy-col:last-child{color:#4ade80}}.about-footer{text-align:center;color:var(--text-sub);padding:24px 16px 8px;font-size:13px}.about-status-list{flex-direction:column;gap:16px;display:flex}.about-status-row{align-items:flex-start;gap:16px;display:flex}.about-status-icon{text-align:center;min-width:28px;color:var(--text-sub);padding-top:2px;font-size:18px}.about-status-icon.delivered{color:var(--primary)}.about-status-icon.failed{color:var(--danger)}.about-status-name{color:var(--text-main);margin-bottom:2px;font-size:14px;font-weight:600}.about-status-desc{color:var(--text-sub);font-size:13px;line-height:1.5}.new-msg-hint{bottom:calc(var(--input-h,56px) + 12px);background:var(--primary);color:#fff;z-index:20;white-space:nowrap;border-radius:20px;padding:6px 16px;font-size:13px;font-weight:500;animation:.2s slideUp;position:absolute;left:50%;transform:translate(-50%);box-shadow:0 2px 8px #0003}@keyframes 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