/* =========================================================================
   The Accelerated Operator - Project Tempest
   Purple theme, Montserrat, locked left-rail layout. Clean, clinical, premium.
   ========================================================================= */

:root {
  --purple: #5B2C87;
  --purple-deep: #47206B;
  --purple-hover: #6D3AA0;
  --lavender: #EDE5F5;
  --lavender-soft: #F6F1FB;
  --ink: #1A1720;
  --ink-soft: #4A4553;
  --line: #E6E0EE;
  --bg: #FFFFFF;
  --bg-tint: #FBFAFD;
  --white: #FFFFFF;
  --sidebar-w: 264px;
  --radius: 10px;
  --shadow: 0 1px 3px rgba(26, 23, 32, 0.06), 0 8px 24px rgba(91, 44, 135, 0.05);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  font-family: "Montserrat", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

button { font-family: inherit; cursor: pointer; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ---------- Boot ---------- */
.boot {
  position: fixed; inset: 0; display: grid; place-items: center;
  color: var(--ink-soft); font-size: 0.9rem; letter-spacing: 0.02em;
}

/* ---------- Brand ---------- */
.brand-kicker {
  display: block; font-size: 0.68rem; font-weight: 600; letter-spacing: 0.22em;
  color: var(--purple); text-transform: uppercase;
}
.brand-title { margin: 0.35rem 0 0; font-size: 1.7rem; font-weight: 700; letter-spacing: -0.01em; }
.brand-title-sm { display: block; margin-top: 0.3rem; font-size: 1.02rem; font-weight: 600; color: var(--ink); }

/* ---------- Login ---------- */
.login-screen {
  min-height: 100vh; display: grid; place-items: center;
  background: linear-gradient(160deg, var(--lavender-soft) 0%, var(--white) 60%);
  padding: 1.5rem;
}
.login-card {
  width: 100%; max-width: 420px; background: var(--white);
  border: 1px solid var(--line); border-radius: 14px; box-shadow: var(--shadow);
  padding: 2.4rem 2.2rem;
}
.login-lede { color: var(--ink-soft); font-size: 0.94rem; line-height: 1.55; margin: 1.4rem 0 1.5rem; }
.login-form { display: flex; flex-direction: column; gap: 0.7rem; }
.login-form input, .chat-form textarea {
  width: 100%; padding: 0.8rem 0.9rem; font-size: 0.95rem; font-family: inherit;
  color: var(--ink); background: var(--bg-tint);
  border: 1px solid var(--line); border-radius: var(--radius); outline: none;
}
.login-form input:focus, .chat-form textarea:focus { border-color: var(--purple); background: var(--white); }
.login-form button {
  padding: 0.82rem 1rem; font-size: 0.92rem; font-weight: 600; letter-spacing: 0.02em;
  color: var(--white); background: var(--purple); border: none; border-radius: var(--radius);
  transition: background 0.15s ease;
}
.login-form button:hover { background: var(--purple-hover); }
.login-form button:disabled { opacity: 0.55; cursor: default; }
.login-status { margin: 1rem 0 0; font-size: 0.86rem; color: var(--ink-soft); min-height: 1.2em; line-height: 1.5; }
.login-status.error { color: #B23A48; }
.login-status.ok { color: var(--purple); }

/* ---------- App shell ---------- */
.app { display: grid; grid-template-columns: var(--sidebar-w) 1fr; min-height: 100vh; }

.sidebar {
  position: fixed; top: 0; left: 0; bottom: 0; width: var(--sidebar-w);
  background: var(--purple-deep); color: var(--white);
  display: flex; flex-direction: column; padding: 1.8rem 1.25rem;
}
.sidebar .brand-kicker { color: var(--lavender); }
.sidebar-brand { padding: 0 0.5rem 1.6rem; border-bottom: 1px solid rgba(255,255,255,0.12); }
.sidebar-brand .brand-title-sm { color: var(--white); }

.nav { display: flex; flex-direction: column; gap: 0.15rem; margin-top: 1.4rem; flex: 1; }
.nav-item {
  text-align: left; padding: 0.72rem 0.85rem; font-size: 0.92rem; font-weight: 500;
  color: rgba(255,255,255,0.82); background: transparent; border: none;
  border-radius: 8px; transition: background 0.14s ease, color 0.14s ease;
}
.nav-item:hover { background: rgba(255,255,255,0.08); color: var(--white); }
.nav-item.active { background: var(--white); color: var(--purple-deep); font-weight: 600; }

.sidebar-footer { border-top: 1px solid rgba(255,255,255,0.12); padding-top: 1.1rem; display: flex; flex-direction: column; gap: 0.6rem; }
.user-email { font-size: 0.76rem; color: rgba(255,255,255,0.6); word-break: break-all; }
.logout-btn {
  align-self: flex-start; font-size: 0.8rem; color: var(--lavender);
  background: transparent; border: 1px solid rgba(255,255,255,0.25); border-radius: 7px;
  padding: 0.42rem 0.75rem; transition: background 0.14s ease;
}
.logout-btn:hover { background: rgba(255,255,255,0.1); }

/* ---------- Content ---------- */
.content { grid-column: 2; padding: 3rem 3.2rem; max-width: 900px; }
.view-head { margin-bottom: 1.8rem; }
.view-head h2 { margin: 0; font-size: 1.9rem; font-weight: 700; letter-spacing: -0.01em; }
.view-sub { margin: 0.5rem 0 0; color: var(--ink-soft); font-size: 0.96rem; }

/* ---------- Book pages ---------- */
.book-view .book-desc { color: var(--ink-soft); font-size: 1.02rem; line-height: 1.7; max-width: 62ch; margin: 0 0 2rem; }
.book-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; }
.btn {
  display: inline-flex; align-items: center; gap: 0.5rem; padding: 0.85rem 1.35rem;
  font-size: 0.9rem; font-weight: 600; letter-spacing: 0.01em; border-radius: var(--radius);
  text-decoration: none; transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}
.btn-primary { background: var(--purple); color: var(--white); border: 1px solid var(--purple); }
.btn-primary:hover { background: var(--purple-hover); border-color: var(--purple-hover); }
.btn-secondary { background: var(--lavender); color: var(--purple-deep); border: 1px solid var(--lavender); }
.btn-secondary:hover { background: #E1D3F0; }
.btn-tertiary { background: transparent; color: var(--purple); border: 1px solid var(--line); }
.btn-tertiary:hover { border-color: var(--purple); }

/* ---------- Sentinel chat ---------- */
.ghost-btn {
  font-size: 0.82rem; font-weight: 600; color: var(--purple); background: transparent;
  border: 1px solid var(--line); border-radius: 8px; padding: 0.5rem 0.85rem; margin-top: 0.9rem;
}
.ghost-btn:hover { border-color: var(--purple); }

.plan-panel { border: 1px solid var(--line); border-radius: 12px; background: var(--lavender-soft); padding: 1.3rem 1.5rem; margin-bottom: 1.4rem; }
.plan-panel-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 0.8rem; }
.plan-duration { font-size: 0.74rem; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; color: var(--purple); }

.chat {
  display: flex; flex-direction: column; gap: 1.1rem;
  min-height: 46vh; max-height: 62vh; overflow-y: auto; padding: 0.4rem 0.2rem 1rem;
}
.msg { max-width: 82%; padding: 0.9rem 1.15rem; border-radius: 14px; font-size: 0.95rem; line-height: 1.62; }
.msg-user { align-self: flex-end; background: var(--purple); color: var(--white); border-bottom-right-radius: 4px; }
.msg-bot { align-self: flex-start; background: var(--bg-tint); border: 1px solid var(--line); border-bottom-left-radius: 4px; }
.msg-bot.thinking { color: var(--ink-soft); font-style: italic; }

.chat-form { display: flex; gap: 0.7rem; align-items: flex-end; margin-top: 1.2rem; border-top: 1px solid var(--line); padding-top: 1.2rem; }
.chat-form textarea { resize: none; max-height: 160px; line-height: 1.5; }
.chat-form button {
  padding: 0.8rem 1.3rem; font-size: 0.9rem; font-weight: 600; color: var(--white);
  background: var(--purple); border: none; border-radius: var(--radius); transition: background 0.15s ease;
}
.chat-form button:hover { background: var(--purple-hover); }
.chat-form button:disabled { opacity: 0.5; cursor: default; }

/* ---------- Markdown ---------- */
.markdown { font-size: 0.95rem; line-height: 1.62; }
.markdown h1, .markdown h2, .markdown h3 { line-height: 1.3; margin: 1.1em 0 0.5em; font-weight: 700; }
.markdown h1 { font-size: 1.3rem; } .markdown h2 { font-size: 1.12rem; } .markdown h3 { font-size: 1rem; }
.markdown p { margin: 0.6em 0; }
.markdown ul, .markdown ol { margin: 0.5em 0; padding-left: 1.3em; }
.markdown li { margin: 0.28em 0; }
.markdown strong { font-weight: 600; }
.markdown code { background: var(--lavender); padding: 0.1em 0.35em; border-radius: 4px; font-size: 0.88em; }
.markdown table { border-collapse: collapse; width: 100%; margin: 0.8em 0; font-size: 0.9em; }
.markdown th, .markdown td { border: 1px solid var(--line); padding: 0.5em 0.7em; text-align: left; }
.markdown th { background: var(--lavender-soft); }
.msg-user .markdown code { background: rgba(255,255,255,0.2); }

/* ---------- Responsive ---------- */
@media (max-width: 820px) {
  .app { grid-template-columns: 1fr; }
  .sidebar { position: static; width: 100%; flex-direction: row; flex-wrap: wrap; align-items: center; padding: 1rem; gap: 0.5rem; }
  .sidebar-brand { border: none; padding: 0 0.5rem 0 0; flex: 1 1 100%; }
  .nav { flex-direction: row; flex-wrap: wrap; margin-top: 0.5rem; flex: 1 1 100%; }
  .nav-item { padding: 0.5rem 0.7rem; font-size: 0.85rem; }
  .sidebar-footer { flex: 1 1 100%; flex-direction: row; justify-content: space-between; align-items: center; border: none; padding-top: 0.3rem; }
  .content { grid-column: 1; padding: 1.8rem 1.3rem; }
  .msg { max-width: 92%; }
}