/*** AmkyawDev AI - Panda CSS (DeepSeek-like Dark Theme) ***/
:root{
    --bg-primary:#1a1a1a;
    --bg-secondary:#2a2a2a;
    --bg-input:#333333;
    --text-primary:#e5e5e5;
    --text-secondary:#a0a0a0;
    --accent:#0b93f6;
    --accent-hover:#0077cc;
    --user-msg:#0b93f6;
    --bot-msg:#2a2a2a;
    --border:#3a3a3a;
    --sidebar-width:280px;
}
*{margin:0;padding:0;box-sizing:border-box}
body{background:var(--bg-primary);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;overflow:hidden}
.app-container{display:flex;height:100vh}
/*** Header ***/
.header{height:56px;background:var(--bg-primary);border-bottom:1px solid var(--border);display:flex;align-items:center;padding:0 16px;position:fixed;top:0;width:100%;z-index:100}
.menu-btn{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:none;border:none;color:var(--text-primary);cursor:pointer;border-radius:8px;transition:all 0.3s}
.menu-btn:hover{background:var(--bg-secondary)}
.menu-btn .bi{font-size:20px}
.menu-btn.active .bi-list::before{content:"\f62b"}
.chat-title{font-size:18px;font-weight:600;margin-left:16px;color:var(--text-primary)}
.header-spacer{flex:1}
/*** Sidebar ***/
.sidebar{width:var(--sidebar-width);background:var(--bg-secondary);height:100vh;position:fixed;left:0;top:0;display:flex;flex-direction:column;z-index:200;transition:transform 0.3s ease}
.sidebar.hidden{transform:translateX(-100%)}
.new-chat-btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:14px;background:var(--accent);color:#fff;border:none;border-radius:10px;margin:16px;cursor:pointer;font-size:15px;font-weight:500;transition:background 0.2s}
.new-chat-btn:hover{background:var(--accent-hover)}
.sidebar-nav{padding:0 12px}
.nav-label{font-size:11px;font-weight:600;text-transform:uppercase;color:var(--text-secondary);padding:16px 12px 8px}
.sidebar-link{display:flex;align-items:center;gap:12px;padding:12px;border-radius:8px;color:var(--text-secondary);text-decoration:none;cursor:pointer;transition:all 0.2s}
.sidebar-link:hover,.sidebar-link.active{background:rgba(255,255,255,0.1);color:var(--text-primary)}
.sidebar-link .bi{font-size:18px}
.chat-history{flex:1;overflow-y:auto;padding:12px;border-top:1px solid var(--border)}
.history-label{font-size:11px;font-weight:600;text-transform:uppercase;color:var(--text-secondary);padding:8px}
.history-item{display:flex;align-items:center;justify-content:space-between;padding:10px 12px;border-radius:8px;color:var(--text-secondary);cursor:pointer;font-size:14px;transition:all 0.2s}
.history-item:hover{background:rgba(255,255,255,0.1);color:var(--text-primary)}
.history-item .delete-btn{opacity:0;background:none;border:none;color:var(--text-secondary);cursor:pointer;padding:4px}
.history-item:hover .delete-btn{opacity:1}
.sidebar-footer{padding:16px;border-top:1px solid var(--border)}
.settings-btn{display:flex;align-items:center;gap:12px;padding:12px;border-radius:8px;color:var(--text-secondary);cursor:pointer;transition:all 0.2s}
.settings-btn:hover{background:rgba(255,255,255,0.1);color:var(--text-primary)}
/*** Main Chat Area ***/
.main-content{flex:1;margin-left:var(--sidebar-width);display:flex;flex-direction:column;height:100vh;transition:margin 0.3s}
.main-content.expanded{margin-left:0}
.chat-messages{flex:1;overflow-y:auto;padding:80px 16px 120px}
.message{display:flex;gap:16px;padding:16px 0;animation:fadeIn 0.3s ease}
@keyframes fadeIn{from{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}
.message-avatar{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;font-size:20px}
.message-avatar.ai{background:var(--accent)}
.message-avatar.user{background:var(--bg-secondary)}
.message-content{max-width:75%}
.message-bubble{padding:14px 18px;border-radius:18px;font-size:15px;line-height:1.5;white-space:pre-wrap;word-break:break-word}
.message.ai .message-bubble{background:var(--bot-msg);color:var(--text-primary);border-bottom-left-radius:4px}
.message.user .message-bubble{background:var(--user-msg);color:#fff;border-bottom-right-radius:4px}
.message-time{font-size:11px;color:var(--text-secondary);margin-top:6px}
/*** Input Area ***/
.input-container{position:fixed;bottom:0;left:var(--sidebar-width);right:0;padding:16px;background:linear-gradient(to top,var(--bg-primary) 60%,transparent);transition:left 0.3s}
.input-container.expanded{left:0}
.input-wrapper{display:flex;align-items:flex-end;gap:12px;background:var(--bg-input);border:1px solid var(--border);border-radius:16px;padding:8px;max-width:800px;margin:0 auto}
.input-wrapper:focus-within{border-color:var(--accent)}
.upload-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:none;border:none;color:var(--text-secondary);cursor:pointer;border-radius:8px;transition:all 0.2s}
.upload-btn:hover{background:var(--bg-secondary);color:var(--text-primary)}
.chat-input{flex:1;background:transparent;border:none;color:var(--text-primary);font-size:15px;resize:none;max-height:120px;padding:8px;line-height:1.5}
.chat-input:focus{outline:none}
.chat-input::placeholder{color:var(--text-secondary)}
.send-btn{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:var(--accent);border:none;color:#fff;border-radius:8px;cursor:pointer;transition:all 0.2s}
.send-btn:hover:not(:disabled){background:var(--accent-hover)}
.send-btn:disabled{opacity:0.5;cursor:not-allowed}
/*** Typing Indicator ***/
.typing-indicator{display:flex;gap:4px;padding:16px 0}
.typing-dot{width:8px;height:8px;background:var(--text-secondary);border-radius:50%;animation:typing 1.4s infinite}
.typing-dot:nth-child(2){animation-delay:0.2s}
.typing-dot:nth-child(3){animation-delay:0.4s}
@keyframes typing{0%,100%{transform:translateY(0);opacity:0.4}50%{transform:translateY(-6px);opacity:1}}
/*** Landing Page ***/
.landing{height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;position:relative;overflow:hidden}
#canvas-container{position:absolute;inset:0;z-index:0}
.landing-content{position:relative;z-index:1;text-align:center;padding:20px}
.landing h1{font-size:4rem;font-weight:800;margin-bottom:16px;background:linear-gradient(135deg,#fff 0%,var(--accent) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.landing p{font-size:1.25rem;color:var(--text-secondary);margin-bottom:32px;max-width:600px}
.cta-btn{display:inline-flex;align-items:center;gap:8px;padding:16px 32px;background:var(--accent);color:#fff;border:none;border-radius:12px;font-size:16px;font-weight:600;cursor:pointer;transition:all 0.2s;text-decoration:none}
.cta-btn:hover{background:var(--accent-hover);transform:translateY(-2px)}
/*** Modal ***/
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,0.7);display:flex;align-items:center;justify-content:center;z-index:1000;opacity:0;visibility:hidden;transition:all 0.3s}
.modal-overlay.show{opacity:1;visibility:visible}
.modal{background:var(--bg-secondary);border:1px solid var(--border);border-radius:16px;padding:24px;max-width:450px;width:90%;transform:scale(0.9);transition:transform 0.3s}
.modal-overlay.show .modal{transform:scale(1)}
.modal h2{font-size:20px;margin-bottom:20px}
.form-group{margin-bottom:16px}
.form-group label{display:block;font-size:14px;color:var(--text-secondary);margin-bottom:6px}
.form-group input,.form-group select{width:100%;padding:12px;background:var(--bg-input);border:1px solid var(--border);border-radius:8px;color:var(--text-primary);font-size:14px}
.form-group input:focus,.form-group select:focus{outline:none;border-color:var(--accent)}
.modal-actions{display:flex;gap:12px;justify-content:flex-end;margin-top:20px}
.btn{ padding:10px 20px;border-radius:8px;font-size:14px;font-weight:500;cursor:pointer;transition:all 0.2s;border:none}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-hover)}
.btn-secondary{background:transparent;color:var(--text-primary);border:1px solid var(--border)}
.btn-secondary:hover{background:var(--bg-input)}
.btn-danger{background:#dc2626;color:#fff}
/*** Docs Page ***/
.docs-container{max-width:900px;margin:0 auto;padding:80px 20px 40px}
.docs-container h1{font-size:2rem;margin-bottom:32px}
.docs-section{background:var(--bg-secondary);border:1px solid var(--border);border-radius:12px;padding:24px;margin-bottom:24px}
.docs-section h2{font-size:1.25rem;margin-bottom:16px;color:var(--accent)}
.docs-section code{background:var(--bg-input);padding:2px 6px;border-radius:4px;font-family:monospace}
.docs-section pre{background:var(--bg-input);padding:16px;border-radius:8px;overflow-x:auto;margin:12px 0}
/*** Responsive ***/
@media(max-width:768px){
    .sidebar{transform:translateX(-100%)}
    .sidebar.show{transform:translateX(0)}
    .main-content,.input-container{margin-left:0;left:0}
    .landing h1{font-size:2.5rem}
}