/*
  Author: Yogabrata Mukhopadhyay
  Organization: Brahmexa
  Copyright (c) 2026 Brahmexa. All rights reserved.
*/

:root {
  --ink: #14201c;
  --ink-soft: #3d4f48;
  --muted: #6a7a73;
  --line: rgba(20, 32, 28, 0.12);
  --surface: #f3f6f2;
  --paper: #fbfcf9;
  --accent: #0f6b5c;
  --accent-deep: #0a4a40;
  --warm: #c45c26;
  --warn-bg: #fff4ea;
  --ok: #1a7a4c;
  --err: #b13228;
  --shadow: 0 18px 50px rgba(20, 32, 28, 0.12);
  --display: "Fraunces", Georgia, serif;
  --sans: "Figtree", system-ui, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", Consolas, monospace;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; color: var(--ink); font: 16px/1.5 var(--sans); background: var(--surface); }
body.is-locked { overflow: hidden; }

/* Brahmexa watermark */
.watermark {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  display: grid;
  place-items: center;
  opacity: 0.07;
}
.watermark img {
  width: min(52vw, 520px);
  height: auto;
  filter: grayscale(0.15);
  user-select: none;
}
.shell, .room, .auth-gate, .toast { position: relative; z-index: 1; }
button, input, select, textarea { font: inherit; color: inherit; }
code { font-family: var(--mono); font-size: 0.86em; background: rgba(15, 107, 92, 0.08); padding: 0.1em 0.35em; border-radius: 4px; }

.btn { border: 1px solid var(--line); background: var(--paper); border-radius: 999px; padding: 0.65rem 1.15rem; cursor: pointer; font-weight: 600; transition: transform 160ms ease; }
.btn:hover { transform: translateY(-1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn--primary { background: var(--accent); border-color: var(--accent); color: #f7fbf9; }
.btn--primary:hover { background: var(--accent-deep); }
.btn--ghost { background: transparent; }
.btn--tiny { padding: 0.35rem 0.7rem; font-size: 0.85rem; }
.pill { font-size: 0.75rem; padding: 0.25rem 0.65rem; border-radius: 999px; background: rgba(15, 107, 92, 0.1); color: var(--accent-deep); font-weight: 600; }
.muted { color: var(--muted); font-size: 0.85rem; }
.status-line { min-height: 1.4em; margin: 0.75rem 0; color: var(--muted); font-size: 0.92rem; }

/* Auth gate */
.auth-gate {
  position: fixed; inset: 0; z-index: 50;
  display: grid; place-items: center;
  background:
    radial-gradient(ellipse 70% 50% at 20% 20%, rgba(15, 107, 92, 0.28), transparent 55%),
    radial-gradient(ellipse 60% 45% at 80% 80%, rgba(196, 92, 38, 0.18), transparent 50%),
    #e8f0ea;
  padding: 1.25rem;
}
.auth-card {
  width: min(420px, 100%);
  background: rgba(251, 252, 249, 0.92);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  animation: rise 500ms ease both;
}
.auth-card h1 { margin: 0.2rem 0 0.5rem; font-family: var(--display); font-size: 2rem; }
.auth-lead { color: var(--ink-soft); margin: 0 0 1rem; }
.auth-form { display: grid; gap: 0.75rem; }
.auth-form label { display: grid; gap: 0.3rem; font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.auth-form input { border: 1px solid var(--line); border-radius: 10px; padding: 0.7rem 0.85rem; background: #fff; }
.auth-err { color: var(--err); margin: 0; font-size: 0.9rem; }

@keyframes rise { from { opacity: 0; transform: translateY(16px); } to { opacity: 1; transform: translateY(0); } }
.eyebrow { margin: 0 0 0.5rem; font-size: 0.78rem; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent-deep); font-weight: 700; }

/* Shell / top filter bar */
.shell {
  position: sticky; top: 0; z-index: 8;
  background: rgba(251, 252, 249, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.shell-row--brand {
  display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 0.65rem;
  padding: 0.55rem 1rem 0.35rem;
}
.top-brand strong { font-family: var(--display); display: block; font-size: 1.15rem; }
.top-actions { display: flex; gap: 0.55rem; align-items: center; flex-wrap: wrap; }
.back { color: var(--accent-deep); text-decoration: none; font-weight: 600; font-size: 0.9rem; }

.filter-bar {
  display: flex;
  flex-wrap: nowrap;
  align-items: end;
  gap: 0.65rem;
  padding: 0.35rem 1rem 0.65rem;
  overflow-x: auto;
}
.filter-bar label {
  display: grid;
  gap: 0.2rem;
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
  flex: 1 1 140px;
  min-width: 120px;
}
.filter-bar select {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 0.5rem 0.65rem;
  background: #fff;
  font-size: 0.9rem;
}

.shell .modes {
  padding: 0 1rem 0.65rem;
  background: transparent;
  border-radius: 0;
  gap: 0.25rem;
}

.quiz-setup, .practice-form {
  display: grid; gap: 0.85rem; padding: 1.25rem; background: rgba(251, 252, 249, 0.82);
  border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow);
  max-width: 420px;
}
.quiz-setup label, .practice-form label {
  display: grid; gap: 0.3rem; font-size: 0.75rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 600;
}
.quiz-setup input, .practice-form input, .practice-form select,
.chat-form textarea, .chat-form select {
  width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 0.7rem 0.85rem; background: var(--paper);
}

/* Room */
.room { min-height: calc(100vh - 140px); display: flex; flex-direction: column; animation: rise 450ms ease both; }
.room-meta { color: var(--muted); font-size: 0.95rem; display: block; margin: 0.15rem 0 0.75rem; }
.modes { display: flex; flex-wrap: wrap; gap: 0.3rem; padding: 0.2rem; background: rgba(20, 32, 28, 0.05); border-radius: 999px; }
.mode { border: 0; background: transparent; border-radius: 999px; padding: 0.4rem 0.85rem; font-weight: 600; color: var(--ink-soft); cursor: pointer; }
.mode.is-active { background: #fff; color: var(--accent-deep); box-shadow: 0 1px 0 var(--line); }

.room-body { flex: 1; display: grid; grid-template-columns: minmax(200px, 260px) 1fr; min-height: 0; }
.chapters { border-right: 1px solid var(--line); background: rgba(238, 243, 239, 0.88); padding: 1rem 0.7rem 2rem; overflow: auto; max-height: calc(100vh - 150px); }
.chapters-head { display: flex; justify-content: space-between; align-items: baseline; padding: 0 0.45rem 0.55rem; }
.chapters-head h2 { margin: 0; font-family: var(--display); font-size: 1.1rem; }
.chapter-list { display: grid; gap: 0.3rem; }
.chapter { text-align: left; border: 1px solid transparent; background: transparent; border-radius: 12px; padding: 0.65rem 0.7rem; cursor: pointer; }
.chapter:hover { background: rgba(251, 252, 249, 0.7); }
.chapter.is-active { background: var(--paper); border-color: var(--line); }
.chapter-title { display: block; font-weight: 600; font-size: 0.92rem; }
.chapter-meta { display: block; color: var(--muted); font-size: 0.78rem; margin-top: 0.12rem; }

.workspace {
  padding: 1.15rem 1.35rem 2.5rem; overflow: auto; max-height: calc(100vh - 150px);
  background: transparent;
}
.pane[hidden] { display: none !important; }
.pane-head h2 { margin: 0 0 0.3rem; font-family: var(--display); font-size: 1.7rem; }
.pane-head p { margin: 0 0 0.9rem; color: var(--ink-soft); max-width: 64ch; }
.pane-actions { display: flex; flex-wrap: wrap; gap: 0.55rem; align-items: center; margin: 0.65rem 0 0.9rem; }
.check { display: inline-flex; gap: 0.35rem; align-items: center; color: var(--ink-soft); font-size: 0.9rem; }

/* Atlas */
.atlas-sky {
  position: relative; min-height: 420px; border-radius: 22px; overflow: hidden;
  background:
    radial-gradient(circle at 30% 40%, rgba(15, 107, 92, 0.18), transparent 40%),
    radial-gradient(circle at 70% 60%, rgba(196, 92, 38, 0.14), transparent 42%),
    #16352e;
  box-shadow: inset 0 0 80px rgba(0, 0, 0, 0.35);
}
.atlas-node {
  position: absolute; transform: translate(-50%, -50%);
  border: 0; border-radius: 50%; cursor: pointer; color: #eef7f3;
  background: radial-gradient(circle at 35% 30%, rgba(255,255,255,0.35), transparent 45%),
              radial-gradient(circle at 50% 50%, #1f8a6d, #0a4037);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.12), 0 10px 30px rgba(0,0,0,0.35);
  display: grid; place-items: center; padding: 0.4rem; text-align: center;
  transition: transform 180ms ease, box-shadow 180ms ease;
  animation: rise 600ms ease both;
}
.atlas-node:hover, .atlas-node.is-active {
  transform: translate(-50%, -50%) scale(1.08);
  box-shadow: 0 0 0 2px rgba(255, 214, 170, 0.55), 0 12px 36px rgba(0,0,0,0.4);
}
.atlas-node small { display: block; font-size: 0.65rem; opacity: 0.85; font-weight: 600; }
.atlas-node span { display: block; font-size: 0.72rem; font-weight: 700; line-height: 1.15; max-width: 7.5ch; }

/* Reality table */
.table-wrap { overflow: auto; border: 1px solid var(--line); border-radius: 14px; background: var(--paper); }
.data-table { width: 100%; border-collapse: collapse; font-size: 0.9rem; }
.data-table th, .data-table td { padding: 0.65rem 0.75rem; border-bottom: 1px solid var(--line); text-align: left; }
.data-table th { font-size: 0.72rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--muted); }
.verdict-ok { color: var(--ok); font-weight: 700; }
.verdict-empty { color: var(--muted); font-weight: 700; }
.verdict-stale { color: var(--warm); font-weight: 700; }

/* Chat / questions / quiz */
.chat-log { display: grid; gap: 0.8rem; min-height: 260px; max-height: min(50vh, 480px); overflow: auto; padding: 0.2rem 0 1rem; }
.bubble { max-width: min(720px, 100%); padding: 0.85rem 1rem; border-radius: 16px; white-space: pre-wrap; animation: rise 280ms ease both; }
.bubble--user { justify-self: end; background: var(--accent); color: #f7fbf9; border-bottom-right-radius: 6px; }
.bubble--ai { justify-self: start; background: var(--paper); border: 1px solid var(--line); border-bottom-left-radius: 6px; }
.bubble--meta { justify-self: center; color: var(--muted); font-size: 0.85rem; background: transparent; padding: 0.2rem; }
.chat-form { display: grid; grid-template-columns: 140px 1fr auto; gap: 0.6rem; align-items: end; position: sticky; bottom: 0; padding-top: 0.4rem; background: linear-gradient(transparent, var(--surface) 30%); }

.q-list { display: grid; gap: 0.8rem; }
.q-card { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 1rem; animation: rise 300ms ease both; }
.q-card h3 { margin: 0 0 0.5rem; font-size: 1rem; font-weight: 600; white-space: pre-wrap; }
.q-meta { display: flex; flex-wrap: wrap; gap: 0.35rem; margin-bottom: 0.5rem; }
.tag { font-size: 0.7rem; letter-spacing: 0.04em; text-transform: uppercase; font-weight: 700; padding: 0.18rem 0.45rem; border-radius: 999px; background: rgba(15, 107, 92, 0.1); color: var(--accent-deep); }
.tag--warn { background: var(--warn-bg); color: #8a3d12; }
.tag--muted { background: rgba(20, 32, 28, 0.06); color: var(--muted); }
.opts { margin: 0; padding-left: 1.1rem; }

.quiz-progress { font-family: var(--display); font-size: 1.1rem; margin-bottom: 0.7rem; }
.quiz-card { background: var(--paper); border: 1px solid var(--line); border-radius: 18px; padding: 1.2rem; margin-bottom: 0.9rem; box-shadow: var(--shadow); }
.quiz-card h3 { margin: 0 0 0.9rem; font-family: var(--display); font-size: 1.3rem; white-space: pre-wrap; }
.opt-btn { display: block; width: 100%; text-align: left; margin: 0.35rem 0; padding: 0.7rem 0.85rem; border-radius: 12px; border: 1px solid var(--line); background: #fff; cursor: pointer; }
.opt-btn.is-picked { border-color: var(--accent); background: rgba(15, 107, 92, 0.08); }
.generated { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 1.1rem; white-space: pre-wrap; max-width: 760px; }
.practice-panel { background: var(--paper); border: 1px solid var(--line); border-radius: 16px; padding: 1rem; max-width: 760px; }
.practice-q { margin: 0 0 0.9rem; padding-bottom: 0.9rem; border-bottom: 1px solid var(--line); }

/* Pulse */
.pulse-summary { display: flex; flex-wrap: wrap; gap: 0.65rem; margin-bottom: 1rem; }
.stat { min-width: 88px; padding: 0.75rem 0.9rem; border-radius: 14px; background: var(--paper); border: 1px solid var(--line); }
.stat b { display: block; font-family: var(--display); font-size: 1.4rem; }
.stat span { font-size: 0.75rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; }
.stat--ok { border-color: rgba(26, 122, 76, 0.35); }
.stat--warn { border-color: rgba(196, 92, 38, 0.35); }
.stat--err { border-color: rgba(177, 50, 40, 0.35); }
.pulse-gaps { display: grid; gap: 0.55rem; margin-bottom: 1rem; }
.gap-card { background: var(--paper); border: 1px solid var(--line); border-radius: 12px; padding: 0.8rem 0.95rem; }
.gap-card h4 { margin: 0 0 0.25rem; font-size: 0.95rem; }
.gap-card p { margin: 0; color: var(--ink-soft); font-size: 0.9rem; }
.pulse-row { display: grid; grid-template-columns: 72px 1fr 70px; gap: 0.5rem; align-items: center; padding: 0.4rem 0; border-bottom: 1px solid var(--line); font-size: 0.88rem; }
.pulse-row code { background: none; padding: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.health-results {
  background: rgba(251, 252, 249, 0.9);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0.35rem 0.9rem;
  max-width: 720px;
}
.health-group { margin: 0.75rem 0 1rem; }
.health-group h4 {
  margin: 0 0 0.35rem;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.pill--ok { background: rgba(26, 122, 76, 0.12); color: var(--ok); }
.pill--warn { background: var(--warn-bg); color: #8a3d12; }
.pill--err { background: rgba(177, 50, 40, 0.1); color: var(--err); }

.toast {
  position: fixed; left: 50%; bottom: 1.2rem; transform: translateX(-50%);
  background: var(--ink); color: #f7fbf9; padding: 0.65rem 1.05rem; border-radius: 999px; z-index: 40; animation: rise 220ms ease both;
}

@media (max-width: 900px) {
  .room-body { grid-template-columns: 1fr; }
  .chapters { max-height: none; border-right: 0; border-bottom: 1px solid var(--line); }
  .chapter-list { display: flex; gap: 0.4rem; overflow-x: auto; }
  .chapter { min-width: 170px; }
  .workspace { max-height: none; }
  .chat-form { grid-template-columns: 1fr; }
  .atlas-sky { min-height: 320px; }
}

/* Education API credential bar. Signing into this UI is a session, not an API
   token — the two get confused, so this states which one is missing. */
.token-bar {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  align-items: center;
  padding: .7rem 1rem;
  background: var(--warn-bg, #fff8e1);
  border-bottom: 1px solid rgba(0, 0, 0, .12);
  font-size: .85rem;
}
.token-bar input {
  flex: 1 1 24rem;
  min-width: 12rem;
  padding: .4rem .55rem;
  border: 1px solid rgba(0, 0, 0, .2);
  border-radius: .35rem;
  font: inherit;
}
.token-bar p { flex: 1 1 100%; margin: 0; }