@import url('https://fonts.googleapis.com/css2?family=Syne:wght@400;600;700;800&family=DM+Mono:wght@300;400;500&family=Lexend:wght@300;400;500;600&display=swap');

:root {
  --bg0:#020509; --bg1:#060d18; --bg2:#0c1829;
  --card:rgba(12,24,41,0.85); --card-h:rgba(18,34,58,0.95);
  --t1:#e8edf5; --t2:#7a92b4; --t3:#3d5275;
  --cyan:#00d9f5; --cyan-d:rgba(0,217,245,.1); --cyan-g:rgba(0,217,245,.25);
  --purple:#7c5af6; --purple-d:rgba(124,90,246,.12);
  --green:#34d399; --red:#f87171; --yellow:#fbbf24;
  --border:rgba(255,255,255,.06); --border-c:rgba(0,217,245,.22);
  --grad:linear-gradient(135deg,#00d9f5 0%,#7c5af6 100%);
  --r:10px; --rl:16px;
  --tr:all .22s cubic-bezier(.4,0,.2,1);
  --ff:'Lexend',sans-serif; --fm:'DM Mono',monospace; --fd:'Syne',sans-serif;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px}
body{font-family:var(--ff);background:var(--bg0);color:var(--t1);height:100vh;overflow:hidden;-webkit-font-smoothing:antialiased}

body::before{content:'';position:fixed;inset:0;background-image:radial-gradient(circle,var(--t3) 1px,transparent 1px);background-size:32px 32px;opacity:.12;pointer-events:none;z-index:0}
body::after{content:'';position:fixed;top:-200px;left:50%;transform:translateX(-50%);width:600px;height:400px;background:radial-gradient(ellipse,rgba(0,217,245,.06) 0%,transparent 70%);pointer-events:none;z-index:0}

::-webkit-scrollbar{width:4px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:rgba(255,255,255,.08);border-radius:2px}
::-webkit-scrollbar-thumb:hover{background:rgba(255,255,255,.14)}

/* ── BUTTONS ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;font-family:var(--ff);font-size:14px;font-weight:500;border:none;cursor:pointer;transition:var(--tr);border-radius:var(--r);padding:10px 20px;text-decoration:none}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 4px 20px var(--cyan-g)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 8px 28px var(--cyan-g)}
.btn-ghost{background:transparent;color:var(--t2);border:1px solid var(--border)}
.btn-ghost:hover{border-color:var(--border-c);color:var(--t1)}

/* ── LOGIN ── */
.login-screen{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;z-index:100;padding:20px}
.login-card{position:relative;z-index:1;width:100%;max-width:400px;background:var(--card);border:1px solid var(--border-c);border-radius:var(--rl);padding:40px;box-shadow:0 20px 60px rgba(0,0,0,.6),0 0 0 1px rgba(0,217,245,.04);animation:fadeUp .4s ease both;backdrop-filter:blur(12px)}

@keyframes fadeUp{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:translateY(0)}}

.login-brand{text-align:center;margin-bottom:28px}
.login-logo-img{width:190px;object-fit:contain;display:block;margin:0 auto 6px}
.login-tagline{font-family:var(--fm);font-size:11px;color:var(--t3);letter-spacing:.1em;text-transform:uppercase}

.login-badge{display:inline-flex;align-items:center;gap:6px;background:var(--cyan-d);border:1px solid var(--border-c);color:var(--cyan);font-family:var(--fm);font-size:11px;font-weight:500;padding:5px 12px;border-radius:20px;margin-bottom:24px}
.login-badge::before{content:'';width:6px;height:6px;background:var(--cyan);border-radius:50%;box-shadow:0 0 8px var(--cyan);animation:dotBlink 1.5s ease-in-out infinite}
@keyframes dotBlink{0%,100%{opacity:1}50%{opacity:.3}}

.field{margin-bottom:14px}
.field label{display:block;font-family:var(--fm);font-size:11px;font-weight:500;color:var(--t2);margin-bottom:6px;letter-spacing:.08em;text-transform:uppercase}
.field input{width:100%;background:var(--bg0);border:1px solid var(--border);border-radius:var(--r);padding:11px 14px;font-family:var(--ff);font-size:14px;color:var(--t1);transition:var(--tr);outline:none}
.field input:focus{border-color:var(--cyan);box-shadow:0 0 0 3px var(--cyan-d)}
.field input::placeholder{color:var(--t3)}

.login-submit{width:100%;margin-top:8px;padding:13px}
.login-footer{text-align:center;margin-top:22px;font-size:13px;color:var(--t3)}
.login-footer a{color:var(--cyan);text-decoration:none;font-weight:500}
.login-footer a:hover{text-decoration:underline}
.login-error{background:rgba(248,113,113,.08);border:1px solid rgba(248,113,113,.2);color:var(--red);font-family:var(--fm);font-size:12px;padding:10px 14px;border-radius:var(--r);margin-top:12px;display:none}
.login-error.show{display:block;animation:fadeUp .2s ease}

/* ── WAITLIST ── */
.waitlist-screen{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:20px;z-index:100}
.waitlist-card{position:relative;z-index:1;width:100%;max-width:440px;background:var(--card);border:1px solid var(--border-c);border-radius:var(--rl);padding:48px 40px;box-shadow:0 20px 60px rgba(0,0,0,.6);text-align:center;animation:fadeUp .4s ease both;backdrop-filter:blur(12px)}
.waitlist-icon{width:52px;height:52px;background:var(--cyan-d);border:1px solid var(--border-c);border-radius:14px;display:flex;align-items:center;justify-content:center;margin:0 auto 22px;font-size:22px}
.waitlist-card h2{font-family:var(--fd);font-size:22px;font-weight:700;color:var(--t1);margin-bottom:10px}
.waitlist-card p{font-size:14px;color:var(--t2);line-height:1.7;margin-bottom:24px}
.waitlist-success{display:none;background:var(--cyan-d);border:1px solid var(--border-c);color:var(--cyan);padding:14px;border-radius:var(--r);font-size:13px;font-weight:500;font-family:var(--fm)}
.waitlist-success.show{display:block;animation:fadeUp .3s ease}

/* ── APP ── */
.app{display:flex;height:100vh;position:relative;z-index:1}

/* ── SIDEBAR ── */
.sidebar{width:248px;flex-shrink:0;background:var(--bg1);border-right:1px solid var(--border);display:flex;flex-direction:column;overflow:hidden}
.sidebar-top{padding:16px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between}
.brand img{height:26px;object-fit:contain}
.btn-new-chat{width:30px;height:30px;background:var(--bg2);border:1px solid var(--border);border-radius:8px;color:var(--t2);cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:15px;transition:var(--tr)}
.btn-new-chat:hover{background:var(--cyan-d);border-color:var(--border-c);color:var(--cyan)}

.sidebar-section{padding:12px 8px 4px}
.sidebar-label{font-family:var(--fm);font-size:10px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--t3);padding:0 8px;margin-bottom:4px}

.history-list{list-style:none;overflow-y:auto;flex:1;padding:4px 8px}
.history-item a{display:flex;align-items:center;gap:8px;padding:8px 10px;border-radius:8px;font-size:13px;color:var(--t2);text-decoration:none;transition:var(--tr);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.history-item a:hover{background:var(--bg2);color:var(--t1)}
.history-item a i{color:var(--t3);font-size:11px;flex-shrink:0}

.sidebar-bottom{margin-top:auto;padding:12px 16px;border-top:1px solid var(--border);display:flex;align-items:center;gap:10px}
.user-avatar{width:32px;height:32px;background:var(--cyan-d);border:1px solid var(--border-c);border-radius:8px;display:flex;align-items:center;justify-content:center;font-family:var(--fd);font-size:12px;font-weight:700;color:var(--cyan);flex-shrink:0}
.user-meta{flex:1;overflow:hidden}
.user-name{font-size:13px;font-weight:500;color:var(--t1);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.user-plan{font-family:var(--fm);font-size:10px;color:var(--t3)}
.btn-logout{background:none;border:none;color:var(--t3);cursor:pointer;font-size:13px;padding:6px;border-radius:6px;transition:color .2s}
.btn-logout:hover{color:var(--red)}

/* ── MAIN ── */
.main{flex:1;display:flex;flex-direction:column;overflow:hidden;background:var(--bg0)}

/* ── HEADER ── */
.chat-header{height:58px;border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 20px;background:rgba(2,5,9,.85);backdrop-filter:blur(16px);flex-shrink:0}
.model-tabs{display:flex;gap:2px;background:var(--bg2);border:1px solid var(--border);border-radius:10px;padding:3px}
.model-tab{display:flex;align-items:center;gap:6px;padding:6px 14px;border-radius:7px;font-size:13px;font-weight:500;color:var(--t3);cursor:pointer;border:none;background:transparent;transition:var(--tr);font-family:var(--ff)}
.model-tab:hover{color:var(--t2)}
.model-tab.active{background:var(--card-h);color:var(--t1);box-shadow:inset 0 1px 0 rgba(255,255,255,.05)}
.model-tab img{height:14px;object-fit:contain}

.usage-bar{display:flex;align-items:center;gap:14px;font-family:var(--fm);font-size:11px;color:var(--t3)}
.usage-item{display:flex;align-items:center;gap:5px}
.usage-item i{font-size:10px}
.usage-count{color:var(--t2);font-weight:500}
.usage-count.warn{color:var(--yellow)}

/* ── MESSAGES ── */
.messages{flex:1;overflow-y:auto;padding:28px 0;display:flex;flex-direction:column;gap:0}
.message{display:flex;gap:14px;padding:14px 24px;transition:background .15s;animation:fadeUp .25s ease both}
.message:hover{background:rgba(255,255,255,.012)}
.message.user{flex-direction:row-reverse}
.msg-avatar{width:30px;height:30px;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:700;font-family:var(--fd);flex-shrink:0;margin-top:2px}
.message.ai .msg-avatar{background:var(--cyan-d);border:1px solid var(--border-c);color:var(--cyan)}
.message.user .msg-avatar{background:var(--bg2);border:1px solid var(--border);color:var(--t2)}
.msg-body{flex:1;min-width:0;max-width:720px}
.message.user .msg-body{display:flex;justify-content:flex-end}
.msg-content{font-size:14.5px;line-height:1.75;color:var(--t1)}
.message.user .msg-content{background:var(--bg2);border:1px solid var(--border);padding:11px 15px;border-radius:12px 12px 2px 12px;display:inline-block;max-width:100%}
.msg-content p{margin-bottom:10px}
.msg-content p:last-child{margin-bottom:0}
.msg-content strong{color:var(--t1);font-weight:600}
.msg-content code{font-family:var(--fm);font-size:12.5px;background:var(--bg2);border:1px solid var(--border);padding:2px 6px;border-radius:4px;color:var(--cyan)}
.msg-content pre{background:var(--bg1);border:1px solid var(--border);border-radius:var(--r);padding:16px;overflow-x:auto;margin:10px 0}
.msg-content pre code{background:none;border:none;padding:0;color:var(--t1);font-size:13px;line-height:1.6}
.msg-content ul,.msg-content ol{margin:8px 0 8px 20px}
.msg-content li{margin-bottom:4px}
.msg-content h3{font-family:var(--fd);font-size:16px;margin:12px 0 6px}

/* Welcome */
.welcome{padding:48px 24px;max-width:580px;animation:fadeUp .5s ease both}
.welcome-logo{font-family:var(--fd);font-size:30px;font-weight:800;color:var(--t1);margin-bottom:8px}
.welcome-logo span{background:var(--grad);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.welcome-sub{font-size:15px;color:var(--t2);line-height:1.7;margin-bottom:28px;font-weight:300}
.quick-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}
.quick-card{background:var(--card);border:1px solid var(--border);border-radius:var(--r);padding:14px 16px;cursor:pointer;transition:var(--tr)}
.quick-card:hover{border-color:var(--border-c);background:var(--card-h)}
.quick-card-icon{font-size:18px;margin-bottom:8px}
.quick-card-title{font-size:13px;font-weight:500;color:var(--t1);margin-bottom:3px}
.quick-card-desc{font-size:12px;color:var(--t3)}

/* Loading dots */
.msg-loading{display:flex;gap:4px;align-items:center;padding:4px 0}
.msg-loading span{width:6px;height:6px;background:var(--t3);border-radius:50%;animation:bounce 1.2s ease infinite}
.msg-loading span:nth-child(2){animation-delay:.2s}
.msg-loading span:nth-child(3){animation-delay:.4s}
@keyframes bounce{0%,60%,100%{transform:translateY(0);opacity:.4}30%{transform:translateY(-6px);opacity:1}}

/* File previews */
.msg-files{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:8px}
.msg-file-thumb{width:60px;height:60px;border-radius:8px;object-fit:cover;border:1px solid var(--border)}
.msg-file-pdf{display:flex;align-items:center;gap:6px;background:var(--bg2);border:1px solid var(--border);border-radius:8px;padding:8px 12px;font-size:12px;color:var(--t2);font-family:var(--fm)}

/* ── INPUT ── */
.input-area{padding:14px 20px 18px;border-top:1px solid var(--border);background:var(--bg0);flex-shrink:0}
.file-preview-row{display:flex;gap:8px;margin-bottom:10px;flex-wrap:wrap}
.preview-chip{display:flex;align-items:center;gap:6px;background:var(--bg2);border:1px solid var(--border);border-radius:20px;padding:5px 10px;font-size:12px;color:var(--t2);font-family:var(--fm)}
.preview-chip img{width:20px;height:20px;border-radius:4px;object-fit:cover}
.preview-chip-remove{cursor:pointer;color:var(--t3);font-size:14px;line-height:1;transition:color .15s}
.preview-chip-remove:hover{color:var(--red)}

.input-box{display:flex;align-items:flex-end;gap:10px;background:var(--bg1);border:1px solid var(--border);border-radius:14px;padding:10px 12px;transition:border-color .2s,box-shadow .2s}
.input-box:focus-within{border-color:var(--border-c);box-shadow:0 0 0 3px var(--cyan-d)}
.input-attach{color:var(--t3);cursor:pointer;padding:6px;border-radius:8px;transition:var(--tr);font-size:14px;line-height:1}
.input-attach:hover{color:var(--cyan);background:var(--cyan-d)}
#fileInput{display:none}
#msgInput{flex:1;background:transparent;border:none;outline:none;font-family:var(--ff);font-size:14px;color:var(--t1);resize:none;max-height:160px;min-height:24px;line-height:1.6;padding:4px 0}
#msgInput::placeholder{color:var(--t3)}

.btn-send{width:36px;height:36px;background:var(--grad);color:#fff;border:none;border-radius:9px;cursor:pointer;display:flex;align-items:center;justify-content:center;font-size:14px;transition:var(--tr);flex-shrink:0}
.btn-send:hover{transform:scale(1.06);box-shadow:0 4px 14px var(--cyan-g)}
.btn-send:disabled{background:var(--bg2);color:var(--t3);cursor:not-allowed;transform:none;box-shadow:none}

.input-hint{text-align:center;font-family:var(--fm);font-size:11px;color:var(--t3);margin-top:8px}

/* ── MODAL ── */
.modal-overlay{position:fixed;inset:0;background:rgba(0,0,0,.75);backdrop-filter:blur(4px);display:none;align-items:center;justify-content:center;z-index:200}
.modal-overlay.show{display:flex;animation:fadeUp .2s ease}
.modal{background:var(--bg2);border:1px solid var(--border-c);border-radius:var(--rl);padding:32px;max-width:380px;width:90%;text-align:center}
.modal h3{font-family:var(--fd);font-size:18px;font-weight:700;margin-bottom:10px}
.modal p{font-size:14px;color:var(--t2);line-height:1.6;margin-bottom:20px}
.progress-track{width:100%;height:3px;background:var(--border);border-radius:2px;overflow:hidden;margin:16px 0}
.progress-fill{height:100%;background:var(--grad);border-radius:2px;width:60%}

@media(max-width:768px){
  .sidebar{position:absolute;left:-248px;height:100%;z-index:50;transition:transform .3s}
  .sidebar.open{transform:translateX(248px)}
  .message{padding:12px 16px}
  .welcome{padding:28px 16px}
  .quick-grid{grid-template-columns:1fr}
}