/* Nice AI — global stylesheet */
:root{
  --primary:#6d5efc; --accent:#00d4ff; --bg:#0b0c1a; --bg2:#11132a;
  --card:#161938; --card2:#1c2046; --line:#262a52; --text:#e7e9ff; --muted:#9aa0c7;
  --good:#22c98b; --warn:#ffb020; --bad:#ff5470; --radius:16px;
  --grad:linear-gradient(135deg,var(--primary),var(--accent));
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,-apple-system,Segoe UI,Roboto,sans-serif;background:var(--bg);color:var(--text);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{max-width:1180px;margin:0 auto;padding:0 20px}
.mono{font-family:ui-monospace,SFMono-Regular,Menlo,monospace}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;border:0;cursor:pointer;font-weight:600;
  padding:12px 22px;border-radius:12px;font-size:15px;transition:.18s;background:var(--card2);color:var(--text)}
.btn:hover{transform:translateY(-1px)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 24px -8px var(--primary)}
.btn-ghost{background:transparent;border:1px solid var(--line)}
.btn-block{width:100%;justify-content:center}
.btn-sm{padding:8px 14px;font-size:13px;border-radius:10px}
.btn-danger{background:rgba(255,84,112,.15);color:var(--bad)}
.btn-good{background:rgba(34,201,139,.15);color:var(--good)}

/* badges */
.badge{display:inline-block;padding:3px 10px;border-radius:999px;font-size:12px;font-weight:600}
.badge-good{background:rgba(34,201,139,.15);color:var(--good)}
.badge-warn{background:rgba(255,176,32,.15);color:var(--warn)}
.badge-bad{background:rgba(255,84,112,.15);color:var(--bad)}
.badge-info{background:rgba(0,212,255,.13);color:var(--accent)}
.badge-muted{background:#23264d;color:var(--muted)}

/* flash */
.flash{padding:12px 16px;border-radius:12px;margin-bottom:14px;font-size:14px;border:1px solid transparent}
.flash.success{background:rgba(34,201,139,.12);border-color:rgba(34,201,139,.3);color:#7ef0c2}
.flash.error{background:rgba(255,84,112,.12);border-color:rgba(255,84,112,.3);color:#ff9bb0}
.flash.info{background:rgba(0,212,255,.1);border-color:rgba(0,212,255,.3);color:#86e6ff}

/* ---------- public nav ---------- */
.nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(14px);background:rgba(11,12,26,.72);border-bottom:1px solid var(--line)}
.nav .container{display:flex;align-items:center;justify-content:space-between;height:68px}
.brand{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px}
.brand .logo{width:34px;height:34px;border-radius:9px;background:var(--grad);display:grid;place-items:center;font-size:18px}
.brand span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.nav-links{display:flex;align-items:center;gap:26px}
.nav-links a{color:var(--muted);font-weight:500;font-size:15px}
.nav-links a:hover{color:var(--text)}
.nav-cta{display:flex;gap:10px;align-items:center}
.menu-btn{display:none;background:none;border:0;color:var(--text);font-size:26px;cursor:pointer}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;padding:90px 0 70px;text-align:center}
.hero::before{content:'';position:absolute;inset:0;background:
  radial-gradient(600px 300px at 50% -10%,rgba(109,94,252,.35),transparent 70%),
  radial-gradient(500px 260px at 85% 20%,rgba(0,212,255,.18),transparent 70%);pointer-events:none}
.hero .pill{display:inline-block;padding:7px 16px;border:1px solid var(--line);border-radius:999px;color:var(--accent);font-size:13px;margin-bottom:22px;background:rgba(0,212,255,.06)}
.hero h1{font-size:clamp(34px,6vw,60px);line-height:1.08;font-weight:800;letter-spacing:-1px;margin-bottom:18px}
.hero h1 span{background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p.sub{font-size:clamp(16px,2.4vw,20px);color:var(--muted);max-width:660px;margin:0 auto 30px}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-stats{display:flex;gap:40px;justify-content:center;margin-top:54px;flex-wrap:wrap}
.hero-stats .s b{display:block;font-size:30px;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-stats .s span{color:var(--muted);font-size:14px}

/* sections */
.section{padding:70px 0}
.section h2{font-size:clamp(26px,4vw,40px);text-align:center;font-weight:800;margin-bottom:10px}
.section .lead{text-align:center;color:var(--muted);max-width:620px;margin:0 auto 46px}

/* feature grid */
.grid{display:grid;gap:20px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.feature{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:26px;transition:.2s}
.feature:hover{border-color:var(--primary);transform:translateY(-4px)}
.feature .ic{width:50px;height:50px;border-radius:13px;background:var(--bg2);display:grid;place-items:center;font-size:24px;margin-bottom:16px}
.feature h3{font-size:18px;margin-bottom:8px}
.feature p{color:var(--muted);font-size:14.5px}

/* pricing */
.pricing{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;align-items:stretch}
.plan{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:28px;display:flex;flex-direction:column;position:relative}
.plan.pop{border-color:var(--primary);box-shadow:0 20px 50px -25px var(--primary)}
.plan .tag{position:absolute;top:-12px;left:50%;transform:translateX(-50%);background:var(--grad);color:#fff;font-size:12px;font-weight:700;padding:5px 14px;border-radius:999px}
.plan h3{font-size:20px;margin-bottom:6px}
.plan .price{font-size:38px;font-weight:800;margin:8px 0}
.plan .price small{font-size:15px;color:var(--muted);font-weight:500}
.plan ul{list-style:none;margin:18px 0 24px;display:flex;flex-direction:column;gap:11px}
.plan ul li{color:var(--muted);font-size:14.5px;display:flex;gap:9px}
.plan ul li::before{content:'✓';color:var(--good);font-weight:800}
.plan .btn{margin-top:auto}

/* ---------- auth ---------- */
.auth-wrap{min-height:100vh;display:grid;place-items:center;padding:40px 20px;position:relative;overflow:hidden}
.auth-wrap::before{content:'';position:absolute;inset:0;background:radial-gradient(700px 400px at 50% 0,rgba(109,94,252,.25),transparent 70%)}
.auth-card{position:relative;width:100%;max-width:430px;background:var(--card);border:1px solid var(--line);border-radius:20px;padding:36px}
.auth-card h1{font-size:26px;margin-bottom:6px}
.auth-card .muted{color:var(--muted);margin-bottom:24px;font-size:14.5px}
.auth-card .center{text-align:center;margin-top:18px;color:var(--muted);font-size:14px}
.auth-card .center a{color:var(--accent);font-weight:600}

/* forms */
.field{margin-bottom:16px}
.field label{display:block;font-size:13.5px;font-weight:600;margin-bottom:7px;color:var(--text)}
.input,select.input,textarea.input{width:100%;background:var(--bg2);border:1px solid var(--line);border-radius:11px;
  padding:12px 14px;color:var(--text);font-size:15px;font-family:inherit;transition:.15s}
.input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(109,94,252,.2)}
textarea.input{resize:vertical;min-height:90px}
.help{font-size:12.5px;color:var(--muted);margin-top:5px}
.row{display:flex;gap:14px;flex-wrap:wrap}
.row .field{flex:1;min-width:160px}

/* footer */
.footer{border-top:1px solid var(--line);padding:50px 0 30px;margin-top:40px;color:var(--muted)}
.footer .cols{display:grid;grid-template-columns:2fr 1fr 1fr 1fr;gap:30px;margin-bottom:30px}
.footer h4{color:var(--text);margin-bottom:14px;font-size:15px}
.footer a{display:block;color:var(--muted);font-size:14px;padding:4px 0}
.footer a:hover{color:var(--text)}
.footer .bottom{border-top:1px solid var(--line);padding-top:20px;font-size:13.5px;text-align:center}

/* ---------- dashboard shell ---------- */
.shell{display:flex;min-height:100vh}
.sidebar{width:248px;background:var(--bg2);border-right:1px solid var(--line);position:fixed;top:0;bottom:0;left:0;display:flex;flex-direction:column;z-index:40;transition:.25s}
.sidebar .brand{padding:20px 22px;font-size:19px}
.sidebar nav{flex:1;overflow-y:auto;padding:8px 12px}
.sidebar .grp{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.08em;padding:16px 12px 7px;font-weight:700}
.sidebar a{display:flex;align-items:center;gap:12px;padding:11px 14px;border-radius:11px;color:var(--muted);font-size:14.5px;font-weight:500;margin-bottom:2px}
.sidebar a .i{width:20px;text-align:center}
.sidebar a:hover{background:var(--card);color:var(--text)}
.sidebar a.active{background:var(--grad);color:#fff}
.sidebar a .pill{margin-left:auto;background:var(--bad);color:#fff;border-radius:999px;font-size:11px;padding:1px 7px}
.main{flex:1;margin-left:248px;min-width:0;display:flex;flex-direction:column}
.topbar{height:64px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 24px;position:sticky;top:0;background:rgba(11,12,26,.8);backdrop-filter:blur(12px);z-index:30}
.topbar .title{font-weight:700;font-size:18px}
.topbar .right{display:flex;align-items:center;gap:16px}
.credit-chip{background:var(--card);border:1px solid var(--line);padding:7px 14px;border-radius:999px;font-size:14px;font-weight:600}
.credit-chip b{color:var(--accent)}
.avatar{width:36px;height:36px;border-radius:50%;background:var(--grad);display:grid;place-items:center;font-weight:700;color:#fff}
.content{padding:26px 24px;flex:1}
.hamb{display:none;background:none;border:0;color:var(--text);font-size:24px;cursor:pointer}

/* cards & stats */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:22px}
.card h3{font-size:16px;margin-bottom:16px}
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-bottom:24px}
.stat{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:20px;position:relative;overflow:hidden}
.stat .lbl{color:var(--muted);font-size:13px;margin-bottom:8px}
.stat .val{font-size:28px;font-weight:800}
.stat .ic{position:absolute;right:16px;top:16px;font-size:26px;opacity:.85}
.stat.g .val{color:var(--good)} .stat.b .val{color:var(--accent)} .stat.p .val{color:var(--primary)} .stat.w .val{color:var(--warn)}

/* tables */
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:var(--radius)}
table.tbl{width:100%;border-collapse:collapse;font-size:14px;min-width:560px}
table.tbl th{text-align:left;padding:13px 16px;color:var(--muted);font-weight:600;border-bottom:1px solid var(--line);background:var(--bg2);font-size:12.5px;text-transform:uppercase;letter-spacing:.03em}
table.tbl td{padding:13px 16px;border-bottom:1px solid var(--line)}
table.tbl tr:last-child td{border-bottom:0}
table.tbl tr:hover td{background:rgba(255,255,255,.02)}

.page-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:22px;flex-wrap:wrap;gap:12px}
.page-head h1{font-size:24px}
.empty{text-align:center;padding:50px 20px;color:var(--muted)}
.empty .big{font-size:46px;margin-bottom:10px}

/* ---------- chat ---------- */
.chat{display:grid;grid-template-columns:260px 1fr;gap:0;height:calc(100vh - 64px)}
.chat-list{border-right:1px solid var(--line);display:flex;flex-direction:column;background:var(--bg2)}
.chat-list .new{margin:14px;}
.chat-list .convs{flex:1;overflow-y:auto;padding:0 10px}
.chat-list .conv{padding:11px 13px;border-radius:10px;cursor:pointer;color:var(--muted);font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;margin-bottom:3px}
.chat-list .conv:hover{background:var(--card)}
.chat-list .conv.active{background:var(--card);color:var(--text)}
.chat-main{display:flex;flex-direction:column;min-width:0}
.chat-head{padding:12px 18px;border-bottom:1px solid var(--line);display:flex;align-items:center;gap:12px}
.chat-head select{max-width:300px}
.chat-body{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;gap:18px}
.msg{display:flex;gap:13px;max-width:820px}
.msg .who{width:34px;height:34px;border-radius:9px;flex-shrink:0;display:grid;place-items:center;font-size:16px}
.msg.user .who{background:var(--card2)}
.msg.assistant .who{background:var(--grad)}
.msg .bubble{background:var(--card);border:1px solid var(--line);border-radius:14px;padding:13px 16px;font-size:15px;white-space:pre-wrap;word-wrap:break-word;overflow-wrap:anywhere}
.msg.user .bubble{background:var(--card2)}
.msg .bubble pre{background:#0a0b16;border:1px solid var(--line);border-radius:10px;padding:12px;overflow-x:auto;margin:8px 0;font-size:13px}
.msg .bubble img{border-radius:12px;margin-top:8px}
.chat-foot{border-top:1px solid var(--line);padding:14px 18px}
.chat-input{display:flex;gap:10px;align-items:flex-end;background:var(--bg2);border:1px solid var(--line);border-radius:14px;padding:10px 12px}
.chat-input textarea{flex:1;background:none;border:0;color:var(--text);font-size:15px;font-family:inherit;resize:none;max-height:160px;outline:none}
.typing{display:inline-flex;gap:4px}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--muted);animation:bl 1.2s infinite}
.typing i:nth-child(2){animation-delay:.2s}.typing i:nth-child(3){animation-delay:.4s}
@keyframes bl{0%,80%,100%{opacity:.3}40%{opacity:1}}

/* toggle switch */
.switch{position:relative;display:inline-block;width:44px;height:24px}
.switch input{display:none}
.switch span{position:absolute;inset:0;background:var(--line);border-radius:999px;transition:.2s;cursor:pointer}
.switch span::before{content:'';position:absolute;width:18px;height:18px;left:3px;top:3px;background:#fff;border-radius:50%;transition:.2s}
.switch input:checked+span{background:var(--grad)}
.switch input:checked+span::before{transform:translateX(20px)}

/* utility */
.flex{display:flex} .between{justify-content:space-between} .center-y{align-items:center}
.gap{gap:12px} .gap-sm{gap:8px} .wrap{flex-wrap:wrap}
.mt{margin-top:16px}.mt-lg{margin-top:28px}.mb{margin-bottom:16px}
.muted{color:var(--muted)} .tac{text-align:center}.tar{text-align:right}
.grid-2{grid-template-columns:repeat(2,1fr)}
.hidden{display:none}
.tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin-bottom:20px}
.tabs a{padding:10px 16px;color:var(--muted);font-weight:600;font-size:14px;border-bottom:2px solid transparent}
.tabs a.active{color:var(--text);border-color:var(--primary)}

/* responsive */
@media(max-width:980px){
  .grid-3,.grid-4,.pricing{grid-template-columns:repeat(2,1fr)}
  .stats{grid-template-columns:repeat(2,1fr)}
  .footer .cols{grid-template-columns:1fr 1fr}
}
@media(max-width:760px){
  .nav-links{display:none} .menu-btn{display:block}
  .nav-links.open{display:flex;position:absolute;top:68px;left:0;right:0;flex-direction:column;background:var(--bg2);padding:18px;border-bottom:1px solid var(--line)}
  .grid-3,.grid-4,.pricing,.stats,.grid-2{grid-template-columns:1fr}
  .sidebar{transform:translateX(-100%)} .sidebar.open{transform:none}
  .main{margin-left:0} .hamb{display:block}
  .chat{grid-template-columns:1fr} .chat-list{display:none} .chat-list.open{display:flex;position:fixed;inset:64px 0 0 0;z-index:35}
  .footer .cols{grid-template-columns:1fr}
}