/* ==========================================================
   MATHEUS · Inteligência Aplicada
   Design: minimalista, editorial, sofisticado.
   Paleta: papel quente + tinta + verde biblioteca + latão.
   ========================================================== */
:root{
  --paper:#FAF8F3;
  --paper-2:#F3EEE4;
  --card:#FFFFFF;
  --ink:#181410;
  --ink-soft:#3E3830;
  --muted:#837768;
  --line:#E7DFD0;
  --line-soft:#EFE8D9;
  --moss:#1E3830;
  --moss-deep:#142722;
  --brass:#A98436;
  --brass-soft:#E9D9B8;
  --danger:#9C3B2E;
  --radius:16px;
  --shadow:0 1px 2px rgba(24,20,16,.05),0 12px 32px -12px rgba(24,20,16,.18);
  --font-display:"Fraunces",Georgia,serif;
  --font-ui:"Inter",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono",monospace;
}
[data-theme="dark"]{
  --paper:#131210;
  --paper-2:#1B1A17;
  --card:#1E1D1A;
  --ink:#EDE6D8;
  --ink-soft:#C9BFAE;
  --muted:#8D8474;
  --line:#2C2A25;
  --line-soft:#26241F;
  --moss:#D9C79A;
  --moss-deep:#EDE6D8;
  --brass:#D9C79A;
  --brass-soft:#3A3423;
  --shadow:0 1px 2px rgba(0,0,0,.4),0 16px 40px -12px rgba(0,0,0,.6);
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font-ui);
  background:var(--paper);
  color:var(--ink);
  -webkit-font-smoothing:antialiased;
  overflow:hidden;
}
/* textura sutil de papel */
.grain{
  position:fixed;inset:0;pointer-events:none;z-index:60;opacity:.5;mix-blend-mode:multiply;
  background-image:url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3CfeColorMatrix type='saturate' values='0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.05'/%3E%3C/svg%3E");
}
[data-theme="dark"] .grain{mix-blend-mode:screen;opacity:.35}

.app{display:flex;height:100dvh}

/* ---------- Sidebar ---------- */
.sidebar{
  width:308px;flex-shrink:0;
  background:var(--card);
  border-right:1px solid var(--line);
  display:flex;flex-direction:column;
  padding:20px 16px 14px;
  z-index:30;
  transition:transform .35s cubic-bezier(.22,1,.36,1);
}
.brand{display:flex;align-items:center;gap:12px;padding:2px 4px 16px}
.brand-mark{
  min-width:52px;height:40px;border-radius:12px;padding:0 10px;
  background:var(--moss);color:var(--paper);
  display:grid;place-items:center;
  font-family:var(--font-ui);font-size:15px;font-weight:800;letter-spacing:.08em;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.2);
}
[data-theme="dark"] .brand-mark{background:var(--brass);color:#1a1712}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-text strong{font-family:var(--font-display);font-size:19px;font-weight:600;letter-spacing:-.01em}
.brand-text span{font-size:11.5px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase;margin-top:3px}
.sidebar-close{display:none;margin-left:auto}

.btn-primary{
  background:var(--moss);color:var(--paper);
  border:0;border-radius:12px;
  padding:12px 14px;font-size:14px;font-weight:600;font-family:var(--font-ui);
  cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;
  transition:transform .18s ease,box-shadow .18s ease,background .18s ease;
  box-shadow:0 6px 18px -8px rgba(30,56,48,.6);
}
.btn-primary:hover{transform:translateY(-1px);background:var(--moss-deep)}
.btn-primary:active{transform:translateY(0) scale(.99)}
.btn-primary .plus{font-size:18px;line-height:1;font-weight:400}
[data-theme="dark"] .btn-primary{background:var(--brass);color:#171410;box-shadow:none}

.search-wrap{
  display:flex;align-items:center;gap:8px;
  margin:12px 0 8px;padding:9px 11px;
  border:1px solid var(--line);border-radius:11px;background:var(--paper);
  color:var(--muted);
}
.search-wrap input{border:0;background:transparent;outline:0;width:100%;font-size:13.5px;color:var(--ink);font-family:var(--font-ui)}
.search-wrap input::placeholder{color:var(--muted)}

.conv-list{flex:1;overflow-y:auto;display:flex;flex-direction:column;gap:4px;padding:6px 0;scrollbar-width:thin}
.conv-item{
  text-align:left;border:1px solid transparent;background:transparent;
  padding:10px 11px;border-radius:11px;cursor:pointer;
  display:flex;flex-direction:column;gap:3px;
  animation:slideIn .3s ease both;
  transition:background .15s ease,border-color .15s ease;
  font-family:var(--font-ui);color:var(--ink);
}
.conv-item:hover{background:var(--paper-2)}
.conv-item.active{background:var(--paper-2);border-color:var(--line)}
.conv-item .t{font-size:13.8px;font-weight:550;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.conv-item .d{font-size:12px;color:var(--muted);display:flex;justify-content:space-between;gap:8px}
.conv-item .row{display:flex;align-items:center;gap:6px}
.mini-btn{border:0;background:transparent;color:var(--muted);cursor:pointer;font-size:12px;padding:2px 5px;border-radius:6px}
.mini-btn:hover{background:var(--line-soft);color:var(--ink)}
.conv-empty{padding:24px 12px;text-align:center;color:var(--muted);font-size:13px;line-height:1.6}

.sidebar-footer{border-top:1px solid var(--line);padding-top:12px;display:flex;flex-direction:column;gap:10px}
.status-card{display:flex;gap:10px;align-items:center;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:9px 11px}
.status-card small{display:block;font-size:12.5px;font-weight:600}
.status-card .muted{font-weight:400;color:var(--muted);font-size:11.5px}
.dot{width:9px;height:9px;border-radius:50%;background:#C9BFAE;flex-shrink:0;transition:background .3s}
.dot.on{background:#2E7D4F;box-shadow:0 0 0 4px rgba(46,125,79,.15);animation:pulseDot 2s infinite}
.footer-actions{display:flex;gap:6px}
.icon-btn{
  border:1px solid var(--line);background:var(--card);color:var(--ink-soft);
  width:34px;height:34px;border-radius:10px;cursor:pointer;
  display:grid;place-items:center;transition:all .18s ease;
}
.icon-btn:hover{border-color:var(--brass);color:var(--ink);transform:translateY(-1px)}
.model-badge{margin:0;font-size:11px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);text-align:center}

/* ---------- Main ---------- */
.main{flex:1;display:flex;flex-direction:column;min-width:0;background:var(--paper)}
.topbar{
  display:flex;align-items:center;gap:12px;
  padding:14px 26px;border-bottom:1px solid var(--line);
  background:color-mix(in srgb,var(--paper) 88%,transparent);
  backdrop-filter:blur(10px);position:sticky;top:0;z-index:10;
}
.menu-btn{display:none}
.topbar-title{flex:1;min-width:0}
.topbar-title h1{margin:0;font-family:var(--font-display);font-size:20px;font-weight:500;letter-spacing:-.01em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.topbar-sub{font-size:12px;color:var(--muted)}
.topbar-right{display:flex;align-items:center;gap:10px}
.model-select{
  border:1px solid var(--line);border-radius:10px;background:var(--card);
  padding:8px 10px;font-size:13px;color:var(--ink);font-family:var(--font-ui);cursor:pointer;outline:0;
}
.live-pill{
  display:flex;align-items:center;gap:7px;
  font-size:11.5px;font-weight:600;letter-spacing:.06em;text-transform:uppercase;
  border:1px solid var(--line);border-radius:999px;padding:7px 12px;background:var(--card);color:var(--muted);
}
.pulse{width:7px;height:7px;border-radius:50%;background:#2E7D4F;animation:pulseDot 1.8s infinite}

.chat-scroll{flex:1;overflow-y:auto;scroll-behavior:smooth}
.chat-inner{max-width:780px;margin:0 auto;padding:36px 24px 16px;display:flex;flex-direction:column;gap:18px}

/* Hero / empty state */
.hero{padding:26px 6px 10px;animation:rise .6s cubic-bezier(.22,1,.36,1) both}
.eyebrow{font-size:11.5px;letter-spacing:.16em;text-transform:uppercase;color:var(--brass);font-weight:700;margin:0 0 14px}
.hero h2{font-family:var(--font-display);font-weight:400;font-size:clamp(32px,5vw,48px);line-height:1.05;letter-spacing:-.02em;margin:0 0 14px}
.hero h2 em{font-style:italic;font-weight:300;color:var(--ink-soft)}
.hero-desc{color:var(--muted);font-size:15.5px;line-height:1.65;max-width:56ch;margin:0 0 22px}
.suggestions{display:flex;flex-wrap:wrap;gap:9px;margin-bottom:22px}
.chip{
  border:1px solid var(--line);background:var(--card);color:var(--ink-soft);
  border-radius:999px;padding:10px 16px;font-size:13.5px;font-weight:500;cursor:pointer;
  transition:all .2s ease;font-family:var(--font-ui);
}
.chip:hover{border-color:var(--moss);color:var(--moss);transform:translateY(-2px);box-shadow:var(--shadow)}
[data-theme="dark"] .chip:hover{color:var(--brass);border-color:var(--brass)}
.hero-meta{display:flex;flex-wrap:wrap;gap:14px;color:var(--muted);font-size:12.5px}

/* Messages */
.msg{display:flex;gap:12px;max-width:100%;animation:rise .45s cubic-bezier(.22,1,.36,1) both}
.msg-avatar{
  min-width:38px;height:32px;padding:0 8px;border-radius:16px;flex-shrink:0;
  display:grid;place-items:center;font-size:11px;font-weight:800;letter-spacing:.05em;
  font-family:var(--font-ui);
}
.msg.user{flex-direction:row-reverse}
.msg.user .msg-avatar{background:var(--ink);color:var(--paper)}
.msg.assistant .msg-avatar{background:var(--moss);color:var(--paper);font-style:italic}
[data-theme="dark"] .msg.assistant .msg-avatar{background:var(--brass);color:#171410}
.msg-body{max-width:min(680px,100%);min-width:0}
.msg-label{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin-bottom:6px;font-weight:600}
.msg.user .msg-label{text-align:right}
.bubble{
  padding:14px 17px;border-radius:4px 16px 16px 16px;
  background:var(--card);border:1px solid var(--line);
  font-size:15px;line-height:1.7;box-shadow:0 1px 2px rgba(24,20,16,.04);
  overflow-wrap:anywhere;
}
.msg.user .bubble{
  background:var(--moss);border-color:var(--moss);color:#F7F3E9;
  border-radius:16px 4px 16px 16px;
}
[data-theme="dark"] .msg.user .bubble{background:#2A2823;border-color:#35322B;color:var(--ink)}
.bubble p{margin:0 0 10px}.bubble p:last-child{margin:0}
.bubble pre{
  background:var(--moss-deep);color:#EDE6D8;border-radius:10px;padding:13px 14px;
  overflow-x:auto;font-family:var(--font-mono);font-size:13px;line-height:1.55;margin:10px 0;
}
.msg.user .bubble pre{background:rgba(0,0,0,.28)}
.bubble code{font-family:var(--font-mono);font-size:.88em;background:var(--paper-2);padding:2px 6px;border-radius:6px}
.bubble pre code{background:transparent;padding:0}
.bubble ul,.bubble ol{margin:8px 0;padding-left:20px}
.bubble li{margin:4px 0}
.bubble a{color:var(--brass)}
.msg-actions{display:flex;gap:4px;margin-top:7px;opacity:0;transition:opacity .2s}
.msg:hover .msg-actions{opacity:1}
.caret{display:inline-block;width:8px;height:18px;background:var(--brass);vertical-align:-3px;margin-left:3px;animation:blink 1s steps(1) infinite;border-radius:2px}

/* typing indicator */
.typing{display:inline-flex;gap:5px;padding:6px 2px}
.typing i{width:7px;height:7px;border-radius:50%;background:var(--muted);animation:bounce 1.2s infinite}
.typing i:nth-child(2){animation-delay:.15s}.typing i:nth-child(3){animation-delay:.3s}

/* Composer */
.composer-zone{padding:14px 24px 16px;background:linear-gradient(to top,var(--paper) 70%,transparent)}
.composer{
  max-width:780px;margin:0 auto;
  display:flex;align-items:flex-end;gap:10px;
  background:var(--card);border:1px solid var(--line);border-radius:18px;
  padding:10px 10px 10px 18px;box-shadow:var(--shadow);
  transition:border-color .2s,box-shadow .2s;
}
.composer:focus-within{border-color:var(--brass);box-shadow:0 0 0 3px color-mix(in srgb,var(--brass) 18%,transparent),var(--shadow)}
.composer textarea{
  flex:1;border:0;background:transparent;resize:none;outline:0;
  font-family:var(--font-ui);font-size:15px;line-height:1.55;color:var(--ink);
  max-height:160px;padding:8px 0;
}
.composer textarea::placeholder{color:var(--muted)}
.send-btn{
  width:42px;height:42px;border-radius:13px;border:0;cursor:pointer;flex-shrink:0;
  background:var(--moss);color:var(--paper);
  display:grid;place-items:center;transition:all .2s ease;
}
.send-btn:hover{transform:translateY(-1px) rotate(-4deg);background:var(--moss-deep)}
.send-btn:disabled{opacity:.4;cursor:default;transform:none}
.send-btn.stop{background:var(--danger);font-size:14px}
.hidden{display:none!important}
.disclaimer{max-width:780px;margin:9px auto 0;text-align:center;font-size:11.5px;color:var(--muted)}

/* Modal */
.modal-backdrop{
  position:fixed;inset:0;background:rgba(20,17,12,.45);backdrop-filter:blur(6px);
  display:grid;place-items:center;z-index:100;padding:18px;
  opacity:0;pointer-events:none;transition:opacity .25s ease;
}
.modal-backdrop.open{opacity:1;pointer-events:auto}
.modal{
  width:min(520px,100%);max-height:90dvh;overflow-y:auto;
  background:var(--card);border:1px solid var(--line);border-radius:20px;
  padding:26px;box-shadow:0 30px 80px -20px rgba(0,0,0,.4);
  transform:translateY(14px) scale(.985);transition:transform .3s cubic-bezier(.22,1,.36,1);
}
.modal-backdrop.open .modal{transform:none}
.modal-head{display:flex;justify-content:space-between;align-items:flex-start;gap:12px;margin-bottom:16px}
.modal-head h3{margin:0;font-family:var(--font-display);font-size:24px;font-weight:500}
.modal-head p{margin:5px 0 0;color:var(--muted);font-size:13.5px}
.modal label{display:block;font-size:13px;font-weight:600;margin:13px 0 6px}
.modal label small{font-weight:400;color:var(--muted)}
.modal input,.modal textarea{
  width:100%;border:1px solid var(--line);border-radius:11px;background:var(--paper);
  padding:11px 13px;font-size:13.5px;color:var(--ink);font-family:var(--font-mono);outline:0;
}
.modal input:focus,.modal textarea:focus{border-color:var(--brass)}
.modal textarea{font-family:var(--font-ui);line-height:1.6}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:18px}
.btn-ghost{border:1px solid var(--line);background:transparent;border-radius:11px;padding:11px 16px;font-size:13.5px;font-weight:600;color:var(--muted);cursor:pointer}
.btn-ghost:hover{color:var(--danger);border-color:var(--danger)}
.hint{font-size:12px;color:var(--muted);margin-top:14px}
.hint code{background:var(--paper-2);padding:2px 6px;border-radius:6px;font-family:var(--font-mono)}

/* Toasts */
.toast-stack{position:fixed;bottom:22px;left:50%;transform:translateX(-50%);display:flex;flex-direction:column;gap:8px;z-index:200}
.toast{
  background:var(--ink);color:var(--paper);font-size:13.5px;font-weight:500;
  padding:11px 18px;border-radius:12px;box-shadow:0 12px 30px -8px rgba(0,0,0,.4);
  animation:toastIn .3s cubic-bezier(.22,1,.36,1) both;
}
.toast.err{background:var(--danger);color:#fff}

.scrim{display:none}

/* ---------- Animations ---------- */
@keyframes rise{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
@keyframes slideIn{from{opacity:0;transform:translateX(-8px)}to{opacity:1;transform:none}}
@keyframes bounce{0%,60%,100%{transform:translateY(0);opacity:.5}30%{transform:translateY(-5px);opacity:1}}
@keyframes blink{50%{opacity:0}}
@keyframes pulseDot{0%,100%{opacity:1}50%{opacity:.45}}
@keyframes toastIn{from{opacity:0;transform:translateY(10px) scale(.97)}to{opacity:1;transform:none}}

/* ---------- Tabs / Preferências (usuário) / Admin ---------- */
.tabs{display:flex;gap:6px;background:var(--paper);border:1px solid var(--line);border-radius:12px;padding:4px;margin-bottom:6px}
.tab{flex:1;border:0;background:transparent;border-radius:9px;padding:9px 10px;font-size:13px;font-weight:600;color:var(--muted);cursor:pointer;font-family:var(--font-ui);transition:all .18s ease}
.tab.active{background:var(--card);color:var(--ink);box-shadow:0 1px 4px rgba(0,0,0,.08)}
.pane-label{font-size:11.5px;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:14px 0 10px}
.mode-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px}
.mode-card{border:1px solid var(--line);background:var(--paper);border-radius:13px;padding:12px 10px;cursor:pointer;text-align:left;display:flex;flex-direction:column;gap:5px;font-family:var(--font-ui);color:var(--ink);transition:all .2s ease;animation:rise .35s ease both}
.mode-card:nth-child(2){animation-delay:.06s}.mode-card:nth-child(3){animation-delay:.12s}
.mode-card strong{font-size:13.5px}
.mode-card span{font-size:11.5px;color:var(--muted);line-height:1.45}
.mode-card:hover{transform:translateY(-2px);box-shadow:var(--shadow)}
.mode-card.selected{border-color:var(--moss);box-shadow:0 0 0 2px color-mix(in srgb,var(--moss) 25%,transparent)}
.mode-card.selected strong{color:var(--moss)}
[data-theme="dark"] .mode-card.selected{border-color:var(--brass)}
[data-theme="dark"] .mode-card.selected strong{color:var(--brass)}
.pref-row{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:4px}
.pref-row label{font-size:13px;font-weight:600;margin:0}
.pref-row select{width:100%;margin-top:6px;border:1px solid var(--line);border-radius:11px;background:var(--paper);padding:11px 12px;font-size:13.5px;color:var(--ink);font-family:var(--font-ui);outline:0;cursor:pointer}
.modal select:focus{border-color:var(--brass)}

/* ---------- Responsive ---------- */
@media (max-width:900px){
  .sidebar{position:fixed;top:0;left:0;bottom:0;transform:translateX(-105%);box-shadow:0 0 60px rgba(0,0,0,.25)}
  .sidebar.open{transform:none}
  .sidebar-close{display:grid}
  .menu-btn{display:grid}
  .scrim{display:block;position:fixed;inset:0;background:rgba(0,0,0,.35);z-index:20;opacity:0;pointer-events:none;transition:opacity .25s}
  .scrim.show{opacity:1;pointer-events:auto}
  .topbar{padding:12px 14px}
  .live-pill{display:none}
  .chat-inner{padding:22px 14px}
  .composer-zone{padding:10px 12px 12px}
}