/* ====================== YopiGPT — design system ====================== */
:root {
  /* lime / lemon palette */
  --lime-50:#f6ffe0; --lime-100:#eaffbe; --lime-200:#d6ff80; --lime-300:#bff43a;
  --lime-400:#a4e000; --lime-500:#86bd00; --lime-600:#688f00;
  --lemon:#ffe600; --lemon-soft:#fff36b; --lemon-deep:#f0c200;

  --ink:#161d00; --ink-2:#2f3a08; --ink-soft:#5a6a2a; --muted:#8a9658;

  --bg:#0f1400;            /* deep olive-black for dark shell */
  --panel:#ffffff;
  --panel-2:#fbffe9;
  --line:#e7f1bf;
  --line-2:#dce9a8;

  --user-grad:linear-gradient(135deg,#c8f73f 0%,#a4e000 100%);
  --accent-grad:linear-gradient(135deg,#bff43a 0%,#ffe600 100%);

  --shadow-sm:0 2px 8px rgba(80,110,0,.10);
  --shadow:0 10px 34px rgba(90,120,0,.16);
  --shadow-lg:0 24px 60px rgba(70,95,0,.22);

  --r-sm:12px; --r:16px; --r-lg:22px; --r-xl:28px;
  --sans:"Outfit",system-ui,-apple-system,Segoe UI,Roboto,sans-serif;
  --mono:"Space Grotesk","SF Mono",Consolas,monospace;
  --sidebar-w:288px;
}

* { box-sizing:border-box; margin:0; padding:0; }
html,body { height:100%; }
body {
  font-family:var(--sans);
  color:var(--ink);
  background:var(--bg);
  overflow:hidden;
  -webkit-font-smoothing:antialiased;
}

/* animated gradient mesh backdrop */
.bg-mesh {
  position:fixed; inset:0; z-index:0;
  background:
    radial-gradient(60vw 50vw at 85% -10%, var(--lemon-soft) 0%, transparent 55%),
    radial-gradient(55vw 55vw at -10% 110%, var(--lime-300) 0%, transparent 55%),
    radial-gradient(40vw 40vw at 110% 90%, var(--lime-200) 0%, transparent 50%),
    var(--panel-2);
  filter:saturate(1.05);
  animation:floatMesh 18s ease-in-out infinite alternate;
}
@keyframes floatMesh { from{transform:scale(1) translateY(0);} to{transform:scale(1.08) translateY(-2%);} }

.app { position:relative; z-index:1; display:flex; height:100vh; padding:14px; gap:14px; }

/* ====================== SIDEBAR ====================== */
.sidebar {
  width:var(--sidebar-w); flex-shrink:0;
  background:rgba(255,255,255,.72);
  backdrop-filter:blur(18px) saturate(1.2);
  border:1px solid rgba(255,255,255,.6);
  border-radius:var(--r-xl);
  box-shadow:var(--shadow);
  display:flex; flex-direction:column; padding:18px 16px; gap:14px;
  transition:transform .28s cubic-bezier(.4,0,.2,1);
}
.brand { display:flex; align-items:center; gap:12px; }
.logo-wrap {
  width:46px; height:46px; border-radius:14px; flex-shrink:0;
  background:var(--accent-grad); display:grid; place-items:center;
  box-shadow:var(--shadow-sm), inset 0 0 0 1px rgba(255,255,255,.5);
}
.logo { font-size:24px; line-height:1; }
.brand-text { display:flex; flex-direction:column; line-height:1.1; flex:1; }
.brand-name { font-weight:800; font-size:21px; letter-spacing:-.6px; }
.brand-sub { font-size:11.5px; font-weight:600; color:var(--lime-600); letter-spacing:.4px; text-transform:uppercase; }
.close-side { display:none; }

.new-chat {
  display:flex; align-items:center; justify-content:center; gap:8px;
  background:var(--ink); color:var(--lime-200);
  border:none; padding:13px; border-radius:14px;
  font-family:var(--sans); font-weight:700; font-size:14.5px; cursor:pointer;
  transition:transform .14s ease, box-shadow .2s, background .2s;
}
.new-chat .plus { font-size:18px; line-height:1; margin-top:-1px; }
.new-chat:hover { background:#222c00; transform:translateY(-1px); box-shadow:var(--shadow-sm); }
.new-chat:active { transform:translateY(0); }

.history { flex:1; overflow-y:auto; display:flex; flex-direction:column; gap:3px; margin:2px -6px; padding:2px 6px; }
.history::-webkit-scrollbar { width:6px; }
.history::-webkit-scrollbar-thumb { background:var(--line-2); border-radius:6px; }
.history-empty { font-size:13px; color:var(--muted); text-align:center; padding:24px 8px; }
.history-item {
  position:relative; padding:10px 30px 10px 12px; border-radius:11px;
  font-size:13.5px; cursor:pointer; color:var(--ink-soft);
  white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
  border:1px solid transparent; transition:background .15s, color .15s;
}
.history-item:hover { background:var(--lime-100); color:var(--ink); }
.history-item.active { background:var(--lime-200); color:var(--ink); border-color:var(--lime-300); font-weight:600; }
.history-item .del {
  position:absolute; right:6px; top:50%; transform:translateY(-50%);
  opacity:0; border:none; background:transparent; cursor:pointer; font-size:13px;
  width:22px; height:22px; border-radius:6px; color:var(--ink-soft);
}
.history-item:hover .del { opacity:.7; }
.history-item .del:hover { opacity:1; background:rgba(0,0,0,.08); }

.account { border-top:1px solid var(--line); padding-top:12px; display:flex; flex-direction:column; gap:8px; }
.acct-row { display:flex; align-items:center; gap:8px; font-size:12.5px; font-weight:600; color:var(--ink-soft); }
.acct-name { overflow:hidden; text-overflow:ellipsis; white-space:nowrap; }
.status-dot { width:9px; height:9px; border-radius:50%; background:#c9c9c9; box-shadow:0 0 0 3px rgba(0,0,0,.04); flex-shrink:0; }
.status-dot.ok { background:#74d100; box-shadow:0 0 0 3px rgba(116,209,0,.18); }
.status-dot.err { background:#ff5b5b; box-shadow:0 0 0 3px rgba(255,91,91,.18); }
.acct-btn {
  border:1px solid var(--line-2); background:#fff; border-radius:10px; padding:8px;
  font-family:var(--sans); font-weight:700; font-size:13px; color:var(--ink); cursor:pointer;
  transition:background .15s, border-color .15s;
}
.acct-btn:hover { background:var(--lime-50); border-color:var(--lime-300); }

/* ====================== MAIN ====================== */
.main {
  flex:1; min-width:0; display:flex; flex-direction:column;
  background:rgba(255,255,255,.55);
  backdrop-filter:blur(18px) saturate(1.2);
  border:1px solid rgba(255,255,255,.6);
  border-radius:var(--r-xl);
  box-shadow:var(--shadow);
  overflow:hidden;
}

.topbar {
  height:62px; flex-shrink:0; display:flex; align-items:center; gap:12px;
  padding:0 16px; border-bottom:1px solid var(--line);
  background:rgba(255,255,255,.4);
}
.icon-btn {
  background:transparent; border:none; cursor:pointer; font-size:17px;
  width:38px; height:38px; border-radius:11px; color:var(--ink-soft);
  display:grid; place-items:center; transition:background .15s;
}
.icon-btn:hover { background:var(--lime-100); }
#menuBtn { display:none; }
.top-actions { margin-left:auto; display:flex; gap:4px; }

/* model picker pill */
.model-pill {
  position:relative; display:flex; align-items:center; gap:9px;
  padding:8px 12px; border-radius:13px; cursor:pointer;
  background:#fff; border:1px solid var(--line-2);
  font-weight:700; font-size:14px; color:var(--ink); user-select:none;
  transition:border-color .15s, box-shadow .15s;
}
.model-pill:hover { border-color:var(--lime-300); box-shadow:var(--shadow-sm); }
.model-dot { width:10px; height:10px; border-radius:50%; background:var(--lime-400); flex-shrink:0; }
.chev { font-size:11px; color:var(--muted); margin-left:2px; }
.model-menu {
  position:absolute; top:calc(100% + 8px); left:0; min-width:280px;
  background:#fff; border:1px solid var(--line-2); border-radius:16px;
  box-shadow:var(--shadow-lg); padding:6px; z-index:50;
  display:none; flex-direction:column; gap:2px; max-height:60vh; overflow-y:auto;
}
.model-menu.open { display:flex; animation:popIn .14s ease; }
@keyframes popIn { from{opacity:0; transform:translateY(-6px) scale(.98);} to{opacity:1; transform:none;} }
.mm-group { font-size:10.5px; font-weight:800; text-transform:uppercase; letter-spacing:.6px; color:var(--muted); padding:8px 10px 4px; }
.mm-item { display:flex; align-items:center; gap:10px; padding:9px 10px; border-radius:11px; cursor:pointer; }
.mm-item:hover { background:var(--lime-50); }
.mm-item.active { background:var(--lime-100); }
.mm-dot { width:9px; height:9px; border-radius:50%; flex-shrink:0; }
.mm-text { display:flex; flex-direction:column; line-height:1.2; }
.mm-name { font-size:13.5px; font-weight:700; }
.mm-hint { font-size:11px; color:var(--muted); font-weight:500; }
.mm-check { margin-left:auto; color:var(--lime-500); font-weight:800; opacity:0; }
.mm-item.active .mm-check { opacity:1; }

/* messages */
.messages { flex:1; overflow-y:auto; padding:28px 18px 8px; scroll-behavior:smooth; }
.messages::-webkit-scrollbar { width:8px; }
.messages::-webkit-scrollbar-thumb { background:var(--line-2); border-radius:8px; }

.msg-row { max-width:780px; margin:0 auto 26px; display:flex; gap:13px; align-items:flex-start; animation:rise .3s ease; }
@keyframes rise { from{opacity:0; transform:translateY(10px);} to{opacity:1; transform:none;} }
.msg-row.user { flex-direction:row-reverse; }
.avatar {
  width:36px; height:36px; border-radius:11px; flex-shrink:0;
  display:grid; place-items:center; font-size:17px; font-weight:800;
  box-shadow:var(--shadow-sm);
}
.avatar.ai { background:var(--accent-grad); }
.avatar.user { background:var(--ink); color:var(--lemon); font-size:14px; }
.msg-col { min-width:0; max-width:100%; display:flex; flex-direction:column; }
.msg-row.user .msg-col { align-items:flex-end; }
.bubble {
  padding:14px 17px; border-radius:var(--r-lg); font-size:15px; line-height:1.62;
  box-shadow:var(--shadow-sm); max-width:100%; overflow-wrap:anywhere;
}
.msg-row.ai .bubble { background:#fff; border:1px solid var(--line); border-top-left-radius:7px; color:var(--ink-2); }
.msg-row.user .bubble { background:var(--user-grad); color:var(--ink); border-top-right-radius:7px; font-weight:500; }

.bubble p { margin:0 0 11px; } .bubble p:last-child { margin-bottom:0; }
.bubble h1,.bubble h2,.bubble h3 { margin:14px 0 7px; line-height:1.25; font-weight:800; }
.bubble h1 { font-size:1.4em; } .bubble h2 { font-size:1.22em; } .bubble h3 { font-size:1.08em; }
.bubble ul,.bubble ol { margin:8px 0 8px 22px; } .bubble li { margin:5px 0; }
.bubble a { color:var(--lime-600); text-decoration:underline; }
.bubble :not(pre) > code { background:var(--lime-100); padding:2px 7px; border-radius:7px; font-family:var(--mono); font-size:.88em; }
.bubble blockquote { border-left:3px solid var(--lime-300); padding-left:12px; margin:10px 0; color:var(--ink-soft); }

/* code block */
.code-block { margin:12px 0; border-radius:14px; overflow:hidden; border:1px solid #2a3a00; box-shadow:var(--shadow-sm); }
.code-head { display:flex; align-items:center; justify-content:space-between; padding:8px 14px; background:#1a2400; color:#cdef7a; font-family:var(--mono); font-size:11.5px; font-weight:600; }
.code-copy { border:none; background:rgba(212,255,128,.12); color:#d9ff85; font-family:var(--mono); font-size:11px; font-weight:600; padding:4px 10px; border-radius:7px; cursor:pointer; transition:background .15s; }
.code-copy:hover { background:rgba(212,255,128,.25); }
.code-block pre { margin:0; background:#10180a; color:#e6ffb3; padding:14px 16px; overflow-x:auto; font-size:13px; line-height:1.55; font-family:var(--mono); }

/* message actions */
.msg-actions { display:flex; gap:4px; margin-top:7px; opacity:0; transition:opacity .15s; }
.msg-row:hover .msg-actions { opacity:1; }
.act-btn { border:1px solid var(--line); background:rgba(255,255,255,.7); border-radius:9px; padding:5px 10px; font-family:var(--sans); font-size:12px; font-weight:600; color:var(--ink-soft); cursor:pointer; display:flex; align-items:center; gap:5px; transition:background .15s, border-color .15s; }
.act-btn:hover { background:var(--lime-50); border-color:var(--lime-300); color:var(--ink); }

/* thinking indicator */
.thinking { display:flex; gap:5px; padding:4px 2px; }
.thinking span { width:8px; height:8px; border-radius:50%; background:var(--lime-400); animation:bounce 1.2s infinite ease-in-out; }
.thinking span:nth-child(2){ animation-delay:.15s; } .thinking span:nth-child(3){ animation-delay:.3s; }
@keyframes bounce { 0%,60%,100%{ transform:translateY(0); opacity:.5; } 30%{ transform:translateY(-6px); opacity:1; } }

/* welcome */
.welcome { max-width:680px; margin:7vh auto 0; text-align:center; padding:0 12px; animation:rise .4s ease; }
.welcome-logo { font-size:60px; margin-bottom:6px; filter:drop-shadow(0 6px 12px rgba(160,200,0,.4)); animation:wobble 4s ease-in-out infinite; }
@keyframes wobble { 0%,100%{ transform:rotate(-4deg); } 50%{ transform:rotate(4deg); } }
.welcome-title { font-size:44px; letter-spacing:-1.5px; font-weight:900; background:linear-gradient(120deg,var(--lime-600),var(--lemon-deep)); -webkit-background-clip:text; background-clip:text; color:transparent; }
.welcome-sub { color:var(--ink-soft); margin:10px auto 28px; font-size:15.5px; max-width:480px; }
.suggestions { display:grid; grid-template-columns:1fr 1fr; gap:13px; text-align:left; }
.sugg {
  display:flex; gap:12px; align-items:flex-start; padding:15px; border-radius:16px; cursor:pointer;
  background:rgba(255,255,255,.75); border:1px solid var(--line); font-size:13.5px; color:var(--ink-soft);
  font-family:var(--sans); transition:transform .14s, border-color .18s, box-shadow .2s; line-height:1.4;
}
.sugg b { color:var(--ink); font-weight:700; }
.sugg-ico { font-size:20px; line-height:1; }
.sugg:hover { transform:translateY(-3px); border-color:var(--lime-300); box-shadow:var(--shadow); background:#fff; }

/* sign-in CTA */
.signin-cta {
  margin:0 auto 26px; max-width:440px; padding:22px;
  background:rgba(255,255,255,.8); border:1.5px solid var(--lime-300);
  border-radius:20px; box-shadow:var(--shadow); text-align:center;
}
.cta-text { font-size:14px; color:var(--ink-soft); margin-bottom:14px; line-height:1.5; }
.cta-btn {
  display:inline-block; width:100%; padding:14px; border:none; border-radius:14px; cursor:pointer;
  background:var(--ink); color:var(--lime-200); font-family:var(--sans); font-weight:800; font-size:15px;
  transition:transform .14s, background .2s, box-shadow .2s;
}
.cta-btn:hover { background:#222c00; transform:translateY(-2px); box-shadow:var(--shadow); }
.cta-note { font-size:11.5px; color:var(--muted); margin-top:10px; }
.cta-note a { color:var(--lime-600); }
.acct-btn.primary { background:var(--ink); color:var(--lime-200); border-color:var(--ink); }
.acct-btn.primary:hover { background:#222c00; }

/* composer */
.composer { flex-shrink:0; padding:12px 18px 16px; }
.composer-inner {
  max-width:780px; margin:0 auto; display:flex; align-items:flex-end; gap:8px;
  background:#fff; border:1.5px solid var(--line-2); border-radius:22px; padding:9px 9px 9px 18px;
  box-shadow:var(--shadow); transition:border-color .18s, box-shadow .18s;
}
.composer-inner:focus-within { border-color:var(--lime-400); box-shadow:0 0 0 4px var(--lime-100), var(--shadow); }
#input {
  flex:1; border:none; outline:none; resize:none; font-family:var(--sans);
  font-size:15.5px; line-height:1.5; max-height:200px; background:transparent; color:var(--ink);
}
#input::placeholder { color:var(--muted); }
.send-btn, .stop-btn {
  flex-shrink:0; width:42px; height:42px; border-radius:14px; border:none; cursor:pointer;
  display:grid; place-items:center; transition:transform .12s, opacity .2s, background .2s;
}
.send-btn { background:var(--accent-grad); color:var(--ink); }
.send-btn:hover { transform:scale(1.06); } .send-btn:active { transform:scale(.96); }
.send-btn:disabled { opacity:.4; cursor:not-allowed; transform:none; }
.stop-btn { background:var(--ink); color:var(--lemon); font-size:14px; }
.stop-btn:hover { background:#2a3500; }
.composer-foot { max-width:780px; margin:9px auto 0; text-align:center; font-size:11.5px; color:var(--muted); }

/* toast */
.toast {
  position:fixed; bottom:26px; left:50%; transform:translate(-50%,40px);
  background:var(--ink); color:var(--lime-200); padding:11px 20px; border-radius:13px;
  font-size:13.5px; font-weight:600; box-shadow:var(--shadow-lg); z-index:200;
  opacity:0; pointer-events:none; transition:transform .25s, opacity .25s;
}
.toast.show { transform:translate(-50%,0); opacity:1; }

/* responsive */
.backdrop { display:none; position:fixed; inset:0; background:rgba(15,20,0,.4); z-index:40; backdrop-filter:blur(2px); }
.backdrop.show { display:block; }
@media (max-width:860px) {
  .app { padding:0; gap:0; }
  .main { border-radius:0; border:none; }
  .sidebar {
    position:fixed; inset:12px auto 12px 12px; z-index:50;
    transform:translateX(calc(-100% - 16px));
  }
  .sidebar.open { transform:translateX(0); }
  .close-side { display:grid; }
  #menuBtn { display:grid; }
  .suggestions { grid-template-columns:1fr; }
  .welcome-title { font-size:36px; }
}
@media (max-width:480px) {
  .model-menu { min-width:240px; }
  .msg-row { gap:9px; }
}