:root {
  --bg:#0a0a0f;--bg2:#111118;--bg3:#18181f;--bg4:#1e1e28;
  --border:rgba(255,255,255,0.07);--border2:rgba(255,255,255,0.12);
  --text:#f0f0f5;--text2:#9999b0;--text3:#555570;
  --accent:#7c6fff;--accent2:#a78bfa;
  --accent-glow:rgba(124,111,255,0.15);--accent-glow2:rgba(124,111,255,0.06);
  --user-bg:#1a1730;--user-border:rgba(124,111,255,0.3);
  --ai-bg:#13131a;--ai-border:rgba(255,255,255,0.06);
  --send-bg:#7c6fff;--send-hover:#9580ff;
  --danger:#ff5f5f;--success:#4ade80;
  --sidebar-w:260px;
  --font-display:'Syne',sans-serif;--font-body:'DM Sans',sans-serif;
  --radius:14px;--radius-sm:8px;--radius-lg:20px;
}
[data-theme="light"] {
  --bg:#f5f5fa;--bg2:#ffffff;--bg3:#eeeff6;--bg4:#e8e8f2;
  --border:rgba(0,0,0,0.07);--border2:rgba(0,0,0,0.12);
  --text:#0f0f1a;--text2:#555570;--text3:#aaaacc;
  --accent:#6655ee;--accent2:#8b6ef0;
  --accent-glow:rgba(102,85,238,0.12);--accent-glow2:rgba(102,85,238,0.05);
  --user-bg:#ede9ff;--user-border:rgba(102,85,238,0.2);
  --ai-bg:#ffffff;--ai-border:rgba(0,0,0,0.07);
  --send-bg:#6655ee;--send-hover:#7c6fff;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0;}
html,body{height:100%;overflow:hidden;}
body{font-family:var(--font-body);background:var(--bg);color:var(--text);display:flex;height:100vh;transition:background .3s,color .3s;}

/* SIDEBAR */
#sidebar{width:var(--sidebar-w);min-width:var(--sidebar-w);background:var(--bg2);border-right:1px solid var(--border);display:flex;flex-direction:column;transition:transform .3s,background .3s;z-index:10;}
.sb-header{padding:20px 18px 16px;border-bottom:1px solid var(--border);}
.logo{display:flex;align-items:center;gap:10px;font-family:var(--font-display);font-size:20px;font-weight:800;color:var(--text);letter-spacing:-0.5px;}
.logo-mark{width:34px;height:34px;border-radius:10px;background:var(--accent);display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:800;color:#fff;box-shadow:0 0 20px var(--accent-glow);}
.new-chat-btn{margin-top:14px;width:100%;padding:9px 14px;background:var(--accent-glow2);border:1px solid var(--border2);border-radius:var(--radius-sm);color:var(--accent2);font-family:var(--font-body);font-size:13px;font-weight:500;cursor:pointer;display:flex;align-items:center;gap:8px;transition:all .2s;}
.new-chat-btn:hover{background:var(--accent-glow);border-color:var(--accent);color:var(--accent);}
.sb-section-label{padding:16px 18px 6px;font-size:10px;font-weight:600;letter-spacing:.08em;color:var(--text3);text-transform:uppercase;}
.history-list{flex:1;overflow-y:auto;padding:0 10px 10px;}
.history-list::-webkit-scrollbar{width:4px;}
.history-list::-webkit-scrollbar-thumb{background:var(--border2);border-radius:2px;}
.history-item{padding:9px 10px;border-radius:var(--radius-sm);cursor:pointer;font-size:13px;color:var(--text2);white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:flex;align-items:center;gap:8px;transition:all .15s;}
.history-item:hover{background:var(--bg3);color:var(--text);}
.history-item.active{background:var(--accent-glow);color:var(--accent2);}
.hi-dot{width:6px;height:6px;border-radius:50%;background:var(--accent);flex-shrink:0;opacity:.7;}
.sb-footer{padding:14px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:8px;}
.sb-footer-row{display:flex;gap:8px;}
.icon-btn{flex:1;padding:8px;border-radius:var(--radius-sm);background:transparent;border:1px solid var(--border);color:var(--text2);cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px;font-size:12px;font-family:var(--font-body);transition:all .2s;}
.icon-btn:hover{background:var(--bg3);color:var(--text);border-color:var(--border2);}
.sb-credit{font-size:11px;color:var(--text3);text-align:center;}

/* MAIN */
#main{flex:1;display:flex;flex-direction:column;min-width:0;overflow:hidden;}
#topbar{padding:14px 24px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;background:var(--bg2);flex-shrink:0;}
.topbar-left{display:flex;align-items:center;gap:12px;}
#menu-toggle{display:none;background:none;border:none;cursor:pointer;color:var(--text2);padding:4px;}
.model-badge{display:flex;align-items:center;gap:6px;background:var(--bg3);border:1px solid var(--border);border-radius:20px;padding:5px 12px;font-size:12px;font-weight:500;color:var(--text2);}
.model-dot{width:7px;height:7px;border-radius:50%;background:var(--success);flex-shrink:0;}
.topbar-right{display:flex;align-items:center;gap:10px;}
.theme-toggle{width:36px;height:36px;border-radius:50%;background:var(--bg3);border:1px solid var(--border);cursor:pointer;display:flex;align-items:center;justify-content:center;color:var(--text2);transition:all .2s;}
.theme-toggle:hover{background:var(--bg4);color:var(--text);}
.avatar{width:34px;height:34px;border-radius:50%;background:linear-gradient(135deg,var(--accent),#c084fc);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;color:#fff;font-family:var(--font-display);cursor:pointer;}

/* CHAT */
#chat-area{flex:1;overflow-y:auto;padding:32px 0;scroll-behavior:smooth;}
#chat-area::-webkit-scrollbar{width:5px;}
#chat-area::-webkit-scrollbar-thumb{background:var(--border2);border-radius:3px;}
.chat-inner{max-width:720px;margin:0 auto;padding:0 24px;display:flex;flex-direction:column;gap:6px;}

/* WELCOME */
#welcome{display:flex;flex-direction:column;align-items:center;text-align:center;padding:60px 20px 40px;gap:16px;}
.welcome-logo{width:68px;height:68px;border-radius:20px;background:var(--accent);display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:30px;font-weight:800;color:#fff;box-shadow:0 0 40px var(--accent-glow),0 0 80px var(--accent-glow2);animation:float 3s ease-in-out infinite;}
@keyframes float{0%,100%{transform:translateY(0);}50%{transform:translateY(-6px);}}
.welcome-title{font-family:var(--font-display);font-size:32px;font-weight:800;color:var(--text);letter-spacing:-1px;line-height:1.1;}
.welcome-title span{color:var(--accent2);}
.welcome-sub{font-size:15px;color:var(--text2);max-width:400px;line-height:1.6;}
.prompts-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px;width:100%;max-width:600px;margin-top:8px;}
.prompt-card{background:var(--bg2);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;cursor:pointer;text-align:left;transition:all .2s;}
.prompt-card:hover{background:var(--bg3);border-color:var(--accent);transform:translateY(-2px);}
.prompt-icon{font-size:18px;margin-bottom:8px;display:block;}
.prompt-title{font-size:13px;font-weight:500;color:var(--text);margin-bottom:3px;}
.prompt-desc{font-size:12px;color:var(--text2);line-height:1.4;}

/* MESSAGES */
.msg{display:flex;gap:12px;align-items:flex-start;animation:msgIn .3s ease forwards;opacity:0;padding:4px 0;}
@keyframes msgIn{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:translateY(0);}}
.msg.user{flex-direction:row-reverse;}
.msg-avatar{width:32px;height:32px;border-radius:10px;flex-shrink:0;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;margin-top:2px;}
.msg.ai .msg-avatar{background:var(--accent);color:#fff;font-family:var(--font-display);}
.msg.user .msg-avatar{background:linear-gradient(135deg,#555,#333);color:#fff;}
[data-theme="light"] .msg.user .msg-avatar{background:linear-gradient(135deg,#aaa,#888);}
.msg-body{display:flex;flex-direction:column;max-width:82%;}
.msg-bubble{padding:13px 17px;border-radius:var(--radius);font-size:14.5px;line-height:1.7;}
.msg.ai .msg-bubble{background:var(--ai-bg);border:1px solid var(--ai-border);color:var(--text);border-top-left-radius:4px;}
.msg.user .msg-bubble{background:var(--user-bg);border:1px solid var(--user-border);color:var(--text);border-top-right-radius:4px;}
.msg-meta{font-size:11px;color:var(--text3);margin-top:5px;display:flex;align-items:center;gap:8px;}
.msg.user .msg-meta{justify-content:flex-end;}
.copy-btn{background:none;border:none;cursor:pointer;color:var(--text3);padding:2px 4px;border-radius:4px;font-size:11px;display:flex;align-items:center;gap:3px;transition:color .15s;}
.copy-btn:hover{color:var(--text2);}
.error-text{color:var(--danger);}

/* MARKDOWN */
.code-block{background:var(--bg4);border:1px solid var(--border);border-radius:8px;padding:12px;margin:8px 0;overflow-x:auto;font-size:13px;font-family:monospace;line-height:1.5;}
.inline-code{background:var(--bg4);padding:2px 6px;border-radius:4px;font-size:13px;font-family:monospace;}
.md-h1{font-family:var(--font-display);font-weight:800;margin:16px 0 8px;font-size:18px;}
.md-h2{font-family:var(--font-display);font-weight:700;margin:14px 0 6px;font-size:16px;}
.md-h3{font-family:var(--font-display);font-weight:700;margin:12px 0 4px;font-size:15px;}
.md-li{display:flex;gap:8px;margin:3px 0;}
.md-bullet{color:var(--accent2);flex-shrink:0;}
.md-p{margin-top:8px;}

/* TYPING */
.typing-indicator{display:flex;gap:4px;align-items:center;padding:6px 2px;}
.typing-dot{width:7px;height:7px;border-radius:50%;background:var(--accent2);opacity:.5;animation:typingBounce .8s ease-in-out infinite;}
.typing-dot:nth-child(2){animation-delay:.15s;}
.typing-dot:nth-child(3){animation-delay:.3s;}
@keyframes typingBounce{0%,100%{transform:translateY(0);opacity:.4;}50%{transform:translateY(-5px);opacity:1;}}

/* INPUT */
#input-area{padding:16px 24px 20px;border-top:1px solid var(--border);background:var(--bg2);flex-shrink:0;}
.input-wrap{max-width:720px;margin:0 auto;background:var(--bg3);border:1px solid var(--border2);border-radius:var(--radius-lg);display:flex;align-items:flex-end;gap:8px;padding:10px 12px;transition:border-color .2s,box-shadow .2s;}
.input-wrap:focus-within{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow2);}
#msg-input{flex:1;background:none;border:none;outline:none;color:var(--text);font-family:var(--font-body);font-size:14.5px;resize:none;min-height:24px;max-height:160px;line-height:1.5;padding:2px 0;}
#msg-input::placeholder{color:var(--text3);}
#send-btn{width:38px;height:38px;border-radius:10px;flex-shrink:0;background:var(--send-bg);border:none;cursor:pointer;display:flex;align-items:center;justify-content:center;color:#fff;transition:all .2s;}
#send-btn:hover{background:var(--send-hover);transform:scale(1.05);}
#send-btn:disabled{opacity:.4;cursor:not-allowed;transform:none;}
.input-footer{max-width:720px;margin:8px auto 0;text-align:center;font-size:11px;color:var(--text3);}

/* OVERLAY / MOBILE */
#overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.5);z-index:9;}
@media(max-width:700px){
  #sidebar{position:fixed;top:0;left:0;bottom:0;z-index:20;transform:translateX(-100%);}
  #sidebar.open{transform:translateX(0);}
  #overlay{display:block;opacity:0;pointer-events:none;transition:opacity .3s;}
  #overlay.show{opacity:1;pointer-events:all;}
  #menu-toggle{display:flex;}
  .prompts-grid{grid-template-columns:1fr;}
}

/* ABOUT MODAL */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.6);z-index:100;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .3s;}
.modal-overlay.show{opacity:1;pointer-events:all;}
.modal{background:var(--bg2);border:1px solid var(--border2);border-radius:var(--radius-lg);padding:32px;max-width:400px;width:90%;position:relative;animation:modalIn .3s ease;}
@keyframes modalIn{from{transform:translateY(20px);opacity:0;}to{transform:translateY(0);opacity:1;}}
.modal-close{position:absolute;top:14px;right:14px;background:none;border:none;color:var(--text2);cursor:pointer;font-size:20px;line-height:1;padding:4px 8px;border-radius:6px;transition:all .2s;}
.modal-close:hover{background:var(--bg3);color:var(--text);}
.founder-avatar{width:72px;height:72px;border-radius:20px;background:linear-gradient(135deg,var(--accent),#c084fc);display:flex;align-items:center;justify-content:center;font-family:var(--font-display);font-size:28px;font-weight:800;color:#fff;margin:0 auto 16px;box-shadow:0 0 30px var(--accent-glow);}
.modal-title{font-family:var(--font-display);font-size:20px;font-weight:800;color:var(--text);text-align:center;margin-bottom:4px;}
.modal-sub{font-size:13px;color:var(--accent2);text-align:center;margin-bottom:20px;font-weight:500;}
.modal-divider{height:1px;background:var(--border);margin:16px 0;}
.modal-text{font-size:14px;color:var(--text2);line-height:1.7;text-align:center;}
.modal-badge{display:inline-flex;align-items:center;gap:6px;background:var(--accent-glow);border:1px solid var(--accent);border-radius:20px;padding:5px 14px;font-size:12px;font-weight:500;color:var(--accent2);margin-top:14px;}
.about-btn{width:100%;margin-top:8px;padding:9px 14px;background:var(--accent-glow2);border:1px solid var(--border2);border-radius:var(--radius-sm);color:var(--accent2);font-family:var(--font-body);font-size:13px;font-weight:500;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;transition:all .2s;}
.about-btn:hover{background:var(--accent-glow);border-color:var(--accent);color:var(--accent);}

/* IMAGE UPLOAD */
.input-toolbar{max-width:720px;margin:0 auto 6px;display:flex;align-items:center;gap:6px;}
.img-upload-btn{width:34px;height:34px;border-radius:var(--radius-sm);background:transparent;border:1px solid var(--border);color:var(--text2);cursor:pointer;display:flex;align-items:center;justify-content:center;transition:all .2s;flex-shrink:0;}
.img-upload-btn:hover{background:var(--bg3);color:var(--accent2);border-color:var(--accent);}
#image-preview{display:none;max-width:720px;margin:0 auto 8px;flex-wrap:wrap;gap:8px;}
.img-preview-inner{display:flex;align-items:center;gap:8px;background:var(--bg3);border:1px solid var(--border2);border-radius:var(--radius-sm);padding:6px 10px;position:relative;}
.img-preview-thumb{width:40px;height:40px;border-radius:6px;object-fit:cover;border:1px solid var(--border);}
.img-preview-name{font-size:12px;color:var(--text2);max-width:160px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}
.img-preview-remove{background:none;border:none;cursor:pointer;color:var(--text3);padding:2px;display:flex;align-items:center;transition:color .15s;}
.img-preview-remove:hover{color:var(--danger);}
.input-wrap.drag-over{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-glow);}

/* IMAGE IN MESSAGES */
.msg-image-wrap{margin-bottom:6px;}
.msg-image{max-width:280px;max-height:280px;border-radius:10px;object-fit:cover;border:1px solid var(--border);cursor:zoom-in;display:block;transition:opacity .2s;}
.msg-image:hover{opacity:.9;}

/* IMAGE MODAL (fullscreen) */
.img-modal{position:fixed;inset:0;background:rgba(0,0,0,.85);z-index:200;display:flex;align-items:center;justify-content:center;opacity:0;pointer-events:none;transition:opacity .3s;}
.img-modal.show{opacity:1;pointer-events:all;}
.img-modal img{max-width:90vw;max-height:90vh;border-radius:12px;object-fit:contain;box-shadow:0 24px 64px rgba(0,0,0,.6);}
.img-modal-close{position:absolute;top:20px;right:20px;width:40px;height:40px;border-radius:50%;background:rgba(255,255,255,.1);border:none;color:#fff;font-size:20px;cursor:pointer;display:flex;align-items:center;justify-content:center;transition:background .2s;}
.img-modal-close:hover{background:rgba(255,255,255,.2);}

/* PASTE HINT */
.paste-hint{font-size:11px;color:var(--text3);display:flex;align-items:center;gap:4px;}