:root {
  --bg: #0a0c10;
  --bg-2: #0f131a;
  --panel: rgba(255, 255, 255, 0.035);
  --panel-solid: #12161f;
  --border: rgba(255, 255, 255, 0.09);
  --border-strong: rgba(255, 255, 255, 0.16);
  --text: #e8ecf3;
  --muted: #8a93a6;
  --faint: #5b6478;
  --accent: #7c5cff;
  --accent-2: #22d3ee;
  --grad: linear-gradient(135deg, #7c5cff 0%, #4f8cff 45%, #22d3ee 100%);
  --radius: 16px;
  --shadow: 0 20px 60px -20px rgba(0, 0, 0, 0.7);
  font-synthesis: none;
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background:
    radial-gradient(1000px 600px at 15% -10%, rgba(124, 92, 255, 0.18), transparent 60%),
    radial-gradient(900px 600px at 100% 0%, rgba(34, 211, 238, 0.12), transparent 55%),
    var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Inter, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}
button, input, textarea { font: inherit; color: inherit; }
a { color: var(--accent-2); }

.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; letter-spacing: 0.2px; }
.brand .dot {
  width: 26px; height: 26px; border-radius: 8px; background: var(--grad);
  box-shadow: 0 6px 20px -6px rgba(124, 92, 255, 0.8);
}
.brand .name { font-size: 16px; }
.brand .name b { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* ---------------- login ---------------- */
.login-wrap { min-height: 100%; display: grid; place-items: center; padding: 24px; }
.login-card {
  width: 100%; max-width: 400px; background: var(--panel-solid);
  border: 1px solid var(--border); border-radius: 22px; padding: 34px 30px;
  box-shadow: var(--shadow); backdrop-filter: blur(12px);
}
.login-card .brand { justify-content: center; margin-bottom: 6px; }
.login-card h1 { font-size: 21px; margin: 18px 0 4px; text-align: center; }
.login-card p.sub { color: var(--muted); text-align: center; margin: 0 0 24px; font-size: 14px; }
.field { position: relative; margin-bottom: 14px; }
.field input {
  width: 100%; padding: 13px 15px; border-radius: 12px; background: #0b0e14;
  border: 1px solid var(--border-strong); outline: none; transition: border-color .15s, box-shadow .15s;
}
.field input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.2); }
.btn {
  width: 100%; padding: 13px 16px; border: none; border-radius: 12px; cursor: pointer;
  background: var(--grad); color: white; font-weight: 650; letter-spacing: .2px;
  box-shadow: 0 10px 30px -10px rgba(79, 140, 255, 0.7); transition: transform .1s, filter .15s;
}
.btn:hover { filter: brightness(1.07); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .6; cursor: default; }
.err { color: #ff8a8a; font-size: 13.5px; min-height: 18px; text-align: center; margin-top: 12px; }

/* ---------------- app shell ---------------- */
.app { display: flex; flex-direction: column; height: 100vh; }
.topbar {
  display: flex; align-items: center; gap: 18px; padding: 0 20px; height: 60px;
  border-bottom: 1px solid var(--border); background: rgba(10, 12, 16, 0.7); backdrop-filter: blur(14px);
  position: sticky; top: 0; z-index: 20;
}
.tabs { display: flex; gap: 4px; margin-left: 8px; background: var(--panel); padding: 4px; border-radius: 12px; border: 1px solid var(--border); }
.tab {
  border: none; background: transparent; color: var(--muted); padding: 8px 16px; border-radius: 9px;
  cursor: pointer; font-weight: 550; font-size: 14px; transition: background .15s, color .15s;
}
.tab:hover { color: var(--text); }
.tab.active { background: var(--border-strong); color: var(--text); }
.spacer { flex: 1; }
.ghost {
  background: transparent; border: 1px solid var(--border-strong); color: var(--muted);
  padding: 7px 13px; border-radius: 10px; cursor: pointer; font-size: 13.5px; transition: color .15s, border-color .15s;
}
.ghost:hover { color: var(--text); border-color: var(--accent); }
.view { flex: 1; min-height: 0; display: none; }
.view.active { display: flex; }

/* ---------------- chat ---------------- */
#view-chat { flex-direction: column; }
.chat-scroll { flex: 1; overflow-y: auto; padding: 26px 0 12px; }
.chat-inner { max-width: 820px; margin: 0 auto; padding: 0 20px; }
.msg { display: flex; gap: 13px; margin-bottom: 22px; animation: rise .25s ease; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
.avatar { width: 32px; height: 32px; border-radius: 9px; flex: none; display: grid; place-items: center; font-size: 15px; }
.avatar.ai { background: var(--grad); }
.avatar.me { background: #232a38; border: 1px solid var(--border-strong); }
.bubble { flex: 1; min-width: 0; }
.bubble .who { font-size: 12.5px; color: var(--faint); margin-bottom: 3px; }
.bubble .body { font-size: 15px; }
.bubble .body p:first-child { margin-top: 0; }
.bubble .body p:last-child { margin-bottom: 0; }
.bubble .body pre { background: #0b0e14; border: 1px solid var(--border); padding: 12px; border-radius: 10px; overflow-x: auto; }
.bubble .body code { background: rgba(255,255,255,.07); padding: .1em .35em; border-radius: 5px; font-size: .9em; }
.bubble .body pre code { background: none; padding: 0; }
.bubble .body table { border-collapse: collapse; width: 100%; }
.bubble .body th, .bubble .body td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.sources { display: flex; flex-wrap: wrap; gap: 7px; margin-top: 11px; }
.chip {
  font-size: 12px; color: var(--muted); background: var(--panel); border: 1px solid var(--border);
  padding: 4px 10px; border-radius: 20px; cursor: pointer; transition: border-color .15s, color .15s;
}
.chip:hover { color: var(--text); border-color: var(--accent-2); }
.chip::before { content: "📄"; margin-right: 5px; font-size: 11px; }
.cursor::after { content: "▋"; color: var(--accent); animation: blink 1s steps(2) infinite; }
@keyframes blink { 50% { opacity: 0; } }

.composer-wrap { border-top: 1px solid var(--border); background: rgba(10,12,16,.75); backdrop-filter: blur(14px); }
.composer { max-width: 820px; margin: 0 auto; padding: 14px 20px 18px; }
.composer .box {
  display: flex; align-items: flex-end; gap: 10px; background: var(--panel-solid);
  border: 1px solid var(--border-strong); border-radius: 16px; padding: 8px 8px 8px 16px; transition: border-color .15s, box-shadow .15s;
}
.composer .box:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124,92,255,.16); }
.composer textarea {
  flex: 1; resize: none; border: none; background: transparent; outline: none; padding: 8px 0;
  max-height: 180px; font-size: 15px;
}
.send { width: 40px; height: 40px; border-radius: 11px; border: none; background: var(--grad); color: #fff; cursor: pointer; flex: none; display: grid; place-items: center; transition: filter .15s, transform .1s; }
.send:hover { filter: brightness(1.08); }
.send:active { transform: translateY(1px); }
.send[disabled] { opacity: .5; cursor: default; }
.hint { text-align: center; color: var(--faint); font-size: 11.5px; margin-top: 8px; }

.empty { max-width: 640px; margin: 8vh auto 0; text-align: center; padding: 0 20px; }
.empty h2 { font-size: 26px; margin: 18px 0 8px; }
.empty h2 span { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.empty p { color: var(--muted); margin: 0 auto 26px; max-width: 460px; }
.suggest { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.suggest button {
  text-align: left; background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
  padding: 14px 16px; cursor: pointer; color: var(--text); transition: border-color .15s, background .15s;
}
.suggest button:hover { border-color: var(--accent); background: rgba(124,92,255,.07); }
.suggest button b { display: block; font-size: 14px; margin-bottom: 3px; }
.suggest button span { font-size: 13px; color: var(--muted); }

/* ---------------- documents ---------------- */
#view-docs { flex-direction: column; overflow: hidden; }
.docs-head { max-width: 1000px; width: 100%; margin: 0 auto; padding: 26px 20px 8px; }
.searchbar { position: relative; }
.searchbar input {
  width: 100%; padding: 14px 16px 14px 46px; border-radius: 14px; background: var(--panel-solid);
  border: 1px solid var(--border-strong); outline: none; font-size: 15px; transition: border-color .15s, box-shadow .15s;
}
.searchbar input:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(124,92,255,.16); }
.searchbar .ico { position: absolute; left: 16px; top: 50%; transform: translateY(-50%); color: var(--faint); }
.docs-meta { color: var(--faint); font-size: 13px; margin: 12px 2px 0; }
.docs-scroll { flex: 1; overflow-y: auto; }
.docs-grid { max-width: 1000px; margin: 0 auto; padding: 14px 20px 40px; display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 14px; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 16px;
  cursor: pointer; transition: border-color .15s, transform .1s, background .15s; text-align: left;
}
.card:hover { border-color: var(--accent); background: rgba(124,92,255,.06); transform: translateY(-2px); }
.card .folder { font-size: 11.5px; color: var(--accent-2); letter-spacing: .3px; text-transform: uppercase; }
.card h3 { font-size: 15px; margin: 7px 0 6px; line-height: 1.35; }
.card p { font-size: 13px; color: var(--muted); margin: 0; display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

/* ---------------- reader modal ---------------- */
.overlay { position: fixed; inset: 0; background: rgba(4,6,10,.6); backdrop-filter: blur(4px); z-index: 40; display: none; opacity: 0; transition: opacity .18s; }
.overlay.show { display: block; opacity: 1; }
.reader {
  position: fixed; top: 0; right: 0; height: 100vh; width: min(720px, 92vw); background: var(--panel-solid);
  border-left: 1px solid var(--border-strong); z-index: 50; transform: translateX(100%); transition: transform .22s ease;
  display: flex; flex-direction: column; box-shadow: var(--shadow);
}
.reader.show { transform: none; }
.reader-top { display: flex; align-items: center; gap: 12px; padding: 16px 20px; border-bottom: 1px solid var(--border); }
.reader-top .folder { font-size: 11.5px; color: var(--accent-2); text-transform: uppercase; letter-spacing: .3px; }
.reader-top h2 { font-size: 17px; margin: 3px 0 0; }
.reader-body { padding: 22px 26px 60px; overflow-y: auto; }
.reader-body h1 { font-size: 24px; }
.reader-body h2 { font-size: 19px; margin-top: 1.6em; border-bottom: 1px solid var(--border); padding-bottom: .3em; }
.reader-body h3 { font-size: 16px; }
.reader-body pre { background: #0b0e14; border: 1px solid var(--border); padding: 12px; border-radius: 10px; overflow-x: auto; }
.reader-body code { background: rgba(255,255,255,.07); padding: .1em .35em; border-radius: 5px; font-size: .9em; }
.reader-body pre code { background: none; padding: 0; }
.reader-body table { border-collapse: collapse; width: 100%; margin: 1em 0; }
.reader-body th, .reader-body td { border: 1px solid var(--border); padding: 7px 11px; text-align: left; }
.reader-body img { max-width: 100%; }
.reader-body a { word-break: break-word; }
.close-x { margin-left: auto; }

.loading { color: var(--muted); text-align: center; padding: 40px; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,.1); border-radius: 8px; border: 2px solid transparent; background-clip: padding-box; }
::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,.18); background-clip: padding-box; }

@media (max-width: 560px) {
  .suggest { grid-template-columns: 1fr; }
  .tab { padding: 8px 12px; }
  .brand .name { display: none; }
}