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0}.settings-section:last-child{border-bottom:0}.settings-section-title{color:var(--text);font-size:14px;font-weight:600}.settings-section-description{color:var(--muted);margin-top:5px;font-size:13px}.settings-field{margin-top:12px}.settings-field select{border:1px solid var(--border);background:var(--surface-2);width:100%;height:46px;color:var(--text);cursor:pointer;border-radius:12px;padding:0 14px;font-size:14px}.settings-field select option{color:var(--text);background:var(--surface)}.settings-field select:focus{outline:2px solid var(--accent);outline-offset:2px}.theme-grid{grid-template-columns:repeat(3,1fr);gap:10px;margin-top:14px;display:grid}.theme-card{border:1px solid var(--border);background:var(--surface-2);color:var(--text);cursor:pointer;text-align:left;border-radius:14px;padding:8px;transition:border-color .15s,transform .15s,background-color .15s;position:relative}.theme-card:hover{border-color:var(--accent);transform:translateY(-1px)}.theme-card.selected{border-color:var(--accent);box-shadow:0 0 0 2px var(--accent)}@supports (color:color-mix(in lab, red, red)){.theme-card.selected{box-shadow:0 0 0 2px color-mix(in srgb, var(--accent) 20%, transparent)}}.theme-preview{border-radius:9px;flex-direction:column;gap:6px;height:74px;margin-bottom:9px;padding:10px;display:flex}.theme-preview div{border-radius:999px;height:7px}.light-preview{background:#f8f9fb;border:1px solid #e2e5ea}.light-preview div{background:#d5d9df}.light-preview div:first-child{background:#6366f1;width:70%}.dark-preview{background:#111418}.dark-preview div{background:#30353d}.dark-preview div:first-child{background:#7475f5;width:70%}.midnight-preview{background:#081523}.midnight-preview div{background:#18304a}.midnight-preview div:first-child{background:#3b82f6;width:70%}.theme-card>span:not(.theme-check){color:var(--text);padding:2px 4px;font-size:12px;font-weight:600;display:block}.theme-check{background:var(--accent);color:#fff;border-radius:50%;place-items:center;width:20px;height:20px;font-size:12px;display:grid;position:absolute;top:10px;right:10px}.settings-footer{border-top:1px solid var(--border);justify-content:flex-end;padding:18px 28px;display:flex}.settings-done{background:var(--accent);color:#fff;cursor:pointer;border:0;border-radius:11px;padding:10px 18px;font-weight:600;transition:background-color .15s}.settings-done:hover{background:var(--accent-hover)}.mobile-overlay{display:none}@media (max-width:760px){.sidebar{transition:left .25s;position:fixed;top:0;left:-270px;box-shadow:10px 0 40px #1414281f}.sidebar.mobile-open{left:0}.mobile-overlay{z-index:15;-webkit-backdrop-filter:blur(2px);backdrop-filter:blur(2px);background:#14141e40;display:block;position:fixed;inset:0}.mobile-menu{border:1px solid var(--border);width:34px;height:34px;color:var(--muted);background:var(--surface);cursor:pointer;border-radius:9px;place-items:center;display:grid}.mobile-title{color:var(--text);margin-left:10px;margin-right:auto;font-size:14px;display:block}.topbar{height:60px;padding:0 15px}.topbar-controls .level-select,.topbar-controls .icon-button{display:none}.welcome{padding-top:50px}.welcome h1{font-size:36px}.welcome-text{font-size:13px}.quick-actions{grid-template-columns:1fr}.learning-settings{justify-content:center;width:100%}.messages,.composer-area{width:calc(100% - 24px)}.message-content{max-width:88%}}@media (max-width:600px){.settings-overlay{align-items:flex-end;padding:0}.settings-panel{border-radius:24px 24px 0 0;width:100%;max-height:92vh}.settings-header,.settings-content,.settings-footer{padding-left:20px;padding-right:20px}.theme-grid{grid-template-columns:1fr}.theme-preview{height:55px}}@media (max-width:420px){.welcome{width:calc(100% - 28px)}.welcome h1{font-size:31px}.welcome-text{margin-bottom:25px}.learning-settings{gap:12px;padding:9px}.setting-divider{display:none}}.conversation{align-items:center;gap:4px;padding:0;display:flex;overflow:hidden}.conversation-open{min-width:0;height:38px;color:inherit;cursor:pointer;text-align:left;background:0 0;border:0;border-radius:9px;flex:1;align-items:center;gap:10px;padding:0 10px;font-size:12px;display:flex}.conversation-open span:last-child{text-overflow:ellipsis;white-space:nowrap;overflow:hidden}.conversation-delete{width:28px;height:28px;color:var(--muted);cursor:pointer;opacity:0;background:0 0;border:0;border-radius:7px;flex-shrink:0;place-items:center;margin-right:4px;font-size:17px;transition:opacity .15s,color .15s,background .15s;display:grid}.conversation:hover .conversation-delete{opacity:1}.conversation-delete:hover{color:#ef4444;background:#ef44441a}