/* Estudea PWA — mobile-first, no build step (spec §2.3, §12). */

:root {
  color-scheme: light;
  --bg: #ffffff;
  --bg-soft: #f6f7fb;
  --bg-sidebar: #f3f4f9;
  --surface: #ffffff;
  --border: #e3e5ee;
  --text: #1c1f2a;
  --text-soft: #5a6072;
  --text-faint: #8a90a2;
  --primary: #3f51d6;
  --primary-strong: #3141b8;
  --primary-soft: #eceefe;
  --on-primary: #ffffff;
  --user-bubble: #eceefe;
  --danger: #c4314b;
  --danger-soft: #fdecef;
  --warning-soft: #fff6e0;
  --warning-text: #7a5300;
  --success: #1f8a5b;
  --code-bg: #f3f4f8;
  --focus: #ffb000;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow: 0 1px 2px rgb(16 20 40 / 6%), 0 6px 24px rgb(16 20 40 / 8%);
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --sidebar-w: 288px;
  --content-w: 760px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #14161c;
    --bg-soft: #1b1e26;
    --bg-sidebar: #181a21;
    --surface: #1f222b;
    --border: #2e3240;
    --text: #e8eaf2;
    --text-soft: #a7adbf;
    --text-faint: #7b8196;
    --primary: #7d8cff;
    --primary-strong: #96a2ff;
    --primary-soft: #262b4a;
    --on-primary: #10132a;
    --user-bubble: #262b4a;
    --danger: #ff7a90;
    --danger-soft: #3a1e26;
    --warning-soft: #3a3020;
    --warning-text: #ffd27a;
    --code-bg: #242833;
    --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 6px 24px rgb(0 0 0 / 35%);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #14161c;
  --bg-soft: #1b1e26;
  --bg-sidebar: #181a21;
  --surface: #1f222b;
  --border: #2e3240;
  --text: #e8eaf2;
  --text-soft: #a7adbf;
  --text-faint: #7b8196;
  --primary: #7d8cff;
  --primary-strong: #96a2ff;
  --primary-soft: #262b4a;
  --on-primary: #10132a;
  --user-bubble: #262b4a;
  --danger: #ff7a90;
  --danger-soft: #3a1e26;
  --warning-soft: #3a3020;
  --warning-text: #ffd27a;
  --code-bg: #242833;
  --shadow: 0 1px 2px rgb(0 0 0 / 30%), 0 6px 24px rgb(0 0 0 / 35%);
}

*,
*::before,
*::after { box-sizing: border-box; }

html, body { height: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.55 var(--font);
  -webkit-font-smoothing: antialiased;
  -webkit-tap-highlight-color: transparent;
}

#app { height: 100%; }

/* Components set their own display; the hidden attribute must always win. */
[hidden] { display: none !important; }

button, input, textarea, select { font: inherit; color: inherit; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 6px; }

.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;
}

.skip-link {
  position: absolute; left: 8px; top: -48px; z-index: 100;
  background: var(--primary); color: var(--on-primary); padding: 8px 14px; border-radius: 8px;
}
.skip-link:focus { top: 8px; }

.noscript { padding: 24px; text-align: center; }

/* --- Buttons & inputs ------------------------------------------------------------------- */

.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 0 18px; border-radius: 999px; border: 1px solid transparent;
  background: var(--primary); color: var(--on-primary); font-weight: 600; cursor: pointer;
  text-decoration: none; transition: background .15s, transform .05s;
}
.btn:hover { background: var(--primary-strong); }
.btn:active { transform: translateY(1px); }
.btn[disabled] { opacity: .55; cursor: not-allowed; }
.btn.secondary { background: transparent; color: var(--text); border-color: var(--border); }
.btn.secondary:hover { background: var(--bg-soft); }
.btn.block { width: 100%; }
.btn svg { width: 18px; height: 18px; flex-shrink: 0; }
.link-btn {
  border: 0; background: none; padding: 4px 0; cursor: pointer; text-align: left;
  color: var(--text-faint); font-size: .82rem; text-decoration: underline; text-underline-offset: 2px;
}
.link-btn:hover { color: var(--text); }

.icon-btn {
  display: inline-grid; place-items: center; width: 40px; height: 40px; border-radius: 10px;
  border: 0; background: transparent; color: var(--text-soft); cursor: pointer;
}
.icon-btn:hover { background: var(--bg-soft); color: var(--text); }
.icon-btn svg { width: 20px; height: 20px; }
.icon-btn[aria-pressed="true"] { color: var(--primary); }

.field { display: grid; gap: 6px; margin-bottom: 16px; }
.field label { font-weight: 600; font-size: .95rem; }
.field input, .field select {
  min-height: 46px; padding: 0 14px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--surface);
}
.field input:focus, .field select:focus { border-color: var(--primary); outline: none; box-shadow: 0 0 0 3px var(--primary-soft); }
.hint { color: var(--text-faint); font-size: .875rem; }

.alert {
  padding: 12px 14px; border-radius: var(--radius-sm); margin-bottom: 16px; font-size: .95rem;
  background: var(--danger-soft); color: var(--danger);
}
.alert.info { background: var(--warning-soft); color: var(--warning-text); }

.spinner {
  width: 28px; height: 28px; border-radius: 50%;
  border: 3px solid var(--border); border-top-color: var(--primary);
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.boot { height: 100%; display: grid; place-items: center; }

/* --- Auth pages ------------------------------------------------------------------------- */

.auth {
  min-height: 100%; display: grid; place-items: center; padding: 24px 16px;
  background: radial-gradient(1200px 600px at 50% -10%, var(--primary-soft), transparent 70%), var(--bg);
}
.auth-card {
  width: min(420px, 100%); background: var(--surface); border: 1px solid var(--border);
  border-radius: 20px; padding: 32px 24px; box-shadow: var(--shadow);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.35rem; }
.brand img { width: 36px; height: 36px; }
.auth-card h1 { font-size: 1.5rem; margin: 24px 0 4px; }
.auth-card p.lead { color: var(--text-soft); margin: 0 0 24px; }

/* --- App shell -------------------------------------------------------------------------- */

.shell { display: flex; height: 100%; overflow: hidden; }

.sidebar {
  position: fixed; inset: 0 auto 0 0; z-index: 30; width: min(86vw, var(--sidebar-w));
  display: flex; flex-direction: column; background: var(--bg-sidebar);
  border-right: 1px solid var(--border); transform: translateX(-100%);
  transition: transform .2s ease; padding-bottom: var(--safe-bottom);
}
.shell[data-drawer="open"] .sidebar { transform: none; box-shadow: var(--shadow); }
.scrim {
  position: fixed; inset: 0; z-index: 20; background: rgb(10 12 20 / 40%);
  opacity: 0; pointer-events: none; transition: opacity .2s;
}
.shell[data-drawer="open"] .scrim { opacity: 1; pointer-events: auto; }

@media (min-width: 900px) {
  .sidebar { position: static; transform: none; width: var(--sidebar-w); flex-shrink: 0; }
  .scrim, .menu-btn { display: none !important; }
}

.sidebar-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 14px 8px; }
.sidebar .new-chat { margin: 6px 14px 12px; }
.sidebar nav { flex: 1; overflow-y: auto; padding: 0 8px 12px; }
.sidebar h2 {
  font-size: .75rem; text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-faint); margin: 16px 8px 6px;
}
.conv-list { list-style: none; margin: 0; padding: 0; }
.conv-list a {
  display: block; padding: 9px 10px; border-radius: 9px; color: var(--text);
  text-decoration: none; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-size: .95rem;
}
.conv-list a:hover { background: var(--bg-soft); }
.conv-list a[aria-current="page"] { background: var(--primary-soft); color: var(--primary-strong); font-weight: 600; }
.conv-list .empty { color: var(--text-faint); padding: 8px 10px; font-size: .9rem; }

.sidebar-foot { border-top: 1px solid var(--border); padding: 12px 14px; display: grid; gap: 10px; }
.user-row { display: flex; align-items: center; gap: 10px; }
.avatar {
  width: 36px; height: 36px; border-radius: 50%; display: grid; place-items: center; flex-shrink: 0;
  background: var(--primary); color: var(--on-primary); font-weight: 700;
}
.user-row .who { flex: 1; min-width: 0; }
.user-row .who strong { display: block; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.user-row .who span { color: var(--text-faint); font-size: .85rem; }

.credits { display: grid; gap: 6px; font-size: .85rem; color: var(--text-soft); }
.credits .bar { height: 6px; border-radius: 99px; background: var(--border); overflow: hidden; }
.credits .bar > span { display: block; height: 100%; background: var(--primary); border-radius: 99px; transition: width .3s; }
.credits .hint { font-size: .75rem; line-height: 1.35; }
.credits.warn .bar > span { background: #e0a100; }
.credits.danger .bar > span { background: var(--danger); }

/* --- Main / chat ------------------------------------------------------------------------ */

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; height: 100%; }
.topbar {
  display: flex; align-items: center; gap: 8px; padding: 8px 12px; min-height: 56px;
  border-bottom: 1px solid var(--border); background: var(--bg);
}
.topbar h1 { font-size: 1rem; margin: 0; flex: 1; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.subject-pill {
  font-size: .78rem; padding: 3px 10px; border-radius: 99px;
  background: var(--primary-soft); color: var(--primary-strong); font-weight: 600;
}

.thread { flex: 1; overflow-y: auto; scroll-behavior: smooth; }
.thread-inner { max-width: var(--content-w); margin: 0 auto; padding: 20px 16px 32px; }

.msg { margin: 0 0 22px; display: flex; flex-direction: column; }
.msg.user { align-items: flex-end; }
.msg.user .bubble {
  background: var(--user-bubble); padding: 10px 16px; border-radius: 18px 18px 4px 18px;
  max-width: 85%; white-space: pre-wrap; overflow-wrap: anywhere;
}
.msg.assistant .bubble { width: 100%; overflow-wrap: anywhere; }
.msg.retracted .bubble { color: var(--text-soft); font-style: italic; }
.msg.error .bubble { color: var(--danger); }

.msg-actions { display: flex; gap: 2px; margin-top: 6px; opacity: .9; flex-wrap: wrap; }
.msg-actions .chip {
  font-size: .82rem; padding: 6px 12px; border-radius: 99px; border: 1px solid var(--border);
  background: transparent; color: var(--text-soft); cursor: pointer; min-height: 34px; margin-left: 4px;
}
.msg-actions .chip:hover { background: var(--bg-soft); color: var(--text); }

.typing { display: inline-flex; gap: 4px; padding: 6px 0; }
.typing span {
  width: 7px; height: 7px; border-radius: 50%; background: var(--text-faint);
  animation: blink 1.2s infinite ease-in-out;
}
.typing span:nth-child(2) { animation-delay: .15s; }
.typing span:nth-child(3) { animation-delay: .3s; }
@keyframes blink { 0%, 80%, 100% { opacity: .25; } 40% { opacity: 1; } }

/* Markdown content */
.md > :first-child { margin-top: 0; }
.md > :last-child { margin-bottom: 0; }
.md p, .md ul, .md ol { margin: 0 0 .8em; }
.md h1, .md h2, .md h3, .md h4 { line-height: 1.3; margin: 1.1em 0 .5em; }
.md h1 { font-size: 1.3rem; } .md h2 { font-size: 1.18rem; } .md h3 { font-size: 1.06rem; }
.md ul, .md ol { padding-left: 1.4em; }
.md li { margin: .25em 0; }
.md code { font-family: var(--mono); font-size: .9em; background: var(--code-bg); padding: .1em .35em; border-radius: 5px; }
.md pre { background: var(--code-bg); padding: 14px; border-radius: 10px; overflow-x: auto; }
.md pre code { background: none; padding: 0; }
.md blockquote { margin: 0 0 .8em; padding: .2em 1em; border-left: 3px solid var(--border); color: var(--text-soft); }
.md table { border-collapse: collapse; display: block; overflow-x: auto; margin: 0 0 .8em; }
.md th, .md td { border: 1px solid var(--border); padding: 6px 10px; }
.md a { color: var(--primary); }
.md .katex-display { overflow-x: auto; overflow-y: hidden; padding: 4px 0; }

/* Empty state */
.welcome { text-align: center; padding: 8vh 8px 24px; }
.welcome h2 { font-size: 1.6rem; margin: 0 0 6px; }
.welcome p { color: var(--text-soft); margin: 0 0 24px; }
.suggestions { display: grid; gap: 10px; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); text-align: left; }
.suggestion {
  border: 1px solid var(--border); background: var(--surface); border-radius: var(--radius);
  padding: 14px; cursor: pointer; color: var(--text); text-align: left;
}
.suggestion:hover { border-color: var(--primary); }
.suggestion strong { display: block; font-size: .85rem; color: var(--primary-strong); margin-bottom: 2px; }

/* Composer */
.composer-wrap { padding: 8px 12px calc(12px + var(--safe-bottom)); background: linear-gradient(transparent, var(--bg) 30%); }
.composer {
  max-width: var(--content-w); margin: 0 auto; display: flex; align-items: flex-end; gap: 8px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 22px;
  padding: 6px 6px 6px 14px; box-shadow: var(--shadow);
}
.composer:focus-within { border-color: var(--primary); }
.composer textarea::placeholder { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.composer textarea {
  flex: 1; min-width: 0; border: 0; outline: none; resize: none; background: transparent;
  max-height: 40vh; min-height: 44px; padding: 10px 0; line-height: 1.45;
}
.composer .send {
  width: 44px; height: 44px; border-radius: 50%; border: 0; flex-shrink: 0; cursor: pointer;
  background: var(--primary); color: var(--on-primary); display: grid; place-items: center;
}
.composer .send[disabled] { opacity: .4; cursor: not-allowed; }
.composer .send svg { width: 20px; height: 20px; }
.composer-note { max-width: var(--content-w); margin: 6px auto 0; text-align: center; font-size: .78rem; color: var(--text-faint); }

.banner { max-width: var(--content-w); margin: 0 auto 8px; }

.center-note { max-width: 520px; margin: 12vh auto; padding: 0 16px; text-align: center; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* --- Phase 2: library, sources, dialogs ------------------------------------------------- */

.search-link {
  display: flex; align-items: center; gap: 8px; margin: 0 14px 4px; padding: 8px 10px;
  border-radius: 9px; color: var(--text-soft); text-decoration: none; font-size: .92rem;
}
.search-link:hover { background: var(--bg-soft); color: var(--text); }
.search-link svg { width: 18px; height: 18px; }
.nav-head { display: flex; align-items: center; justify-content: space-between; padding-right: 4px; }
.icon-btn.small { width: 30px; height: 30px; }
.icon-btn.small svg { width: 16px; height: 16px; }

.sources { margin-top: 10px; border: 1px solid var(--border); border-radius: 12px; font-size: .9rem; }
.sources summary { cursor: pointer; padding: 8px 12px; color: var(--text-soft); list-style-position: inside; }
.sources ul { list-style: none; margin: 0; padding: 0 12px 10px; display: grid; gap: 6px; }
.sources li { display: grid; gap: 2px; padding: 8px 10px; border-radius: 9px; background: var(--bg-soft); }
.src-title { font-weight: 600; }
.src-meta { color: var(--text-faint); font-size: .82rem; }

.library { padding-top: 8px; }
.library h2 { font-size: 1rem; margin: 20px 0 10px; }
.library textarea, .modal textarea, .modal select {
  width: 100%; padding: 10px 14px; border-radius: var(--radius-sm); border: 1px solid var(--border);
  background: var(--surface); resize: vertical; min-height: 46px;
}
.row { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.row.end { justify-content: flex-end; }
.danger-zone { margin-top: 24px; }
.card-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.card {
  width: 100%; text-align: left; font: inherit;
  display: grid; gap: 4px; padding: 12px 14px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); color: var(--text); text-decoration: none;
}
.card:hover { border-color: var(--primary); }
.snippet { color: var(--text-soft); font-size: .92rem; }
.snippet mark { background: var(--primary-soft); color: var(--text); border-radius: 3px; padding: 0 2px; }

.modal {
  width: min(460px, calc(100vw - 32px)); border: 1px solid var(--border); border-radius: 18px;
  background: var(--surface); color: var(--text); padding: 24px; box-shadow: var(--shadow);
}
.modal::backdrop { background: rgb(10 12 20 / 45%); }
.modal h2 { margin: 0 0 16px; font-size: 1.2rem; }

/* --- Phase 3: attachments, artifacts, files ---------------------------------------------- */

.composer .attach {
  width: 40px; height: 44px; border: 0; background: none; color: var(--text-soft); cursor: pointer;
  display: grid; place-items: center; flex-shrink: 0; margin-left: -6px;
}
.composer .attach:hover { color: var(--text); }
.composer .attach svg { width: 20px; height: 20px; }
.attach-chips { max-width: var(--content-w); margin: 0 auto 8px; display: flex; flex-wrap: wrap; gap: 8px; }
.attach-chips:empty { display: none; }
.attach-chip {
  display: flex; align-items: center; gap: 8px; padding: 6px 8px 6px 6px; border-radius: 12px;
  border: 1px solid var(--border); background: var(--surface); font-size: .85rem; max-width: 100%;
}
.attach-chip img { width: 36px; height: 36px; object-fit: cover; border-radius: 8px; }
.attach-chip svg { width: 20px; height: 20px; }
.attach-chip > span:first-of-type { max-width: 180px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.attach-chip.error { border-color: var(--danger); color: var(--danger); }
.chip-x { border: 0; background: none; font-size: 1.2rem; line-height: 1; cursor: pointer; color: var(--text-soft); }

.msg-attachments { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; margin-bottom: 6px; max-width: 85%; }
.msg-attachments img { max-width: 220px; max-height: 220px; border-radius: 14px; border: 1px solid var(--border); object-fit: cover; }
.doc-chip { display: inline-flex; align-items: center; gap: 6px; padding: 6px 10px; border-radius: 10px; background: var(--bg-soft); font-size: .85rem; }
.doc-chip svg { width: 16px; height: 16px; }

.artifact-card, .file-card {
  margin: 12px 0; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface);
}
.artifact-card .card-head { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 12px 14px; flex-wrap: wrap; }
.card-title { display: grid; gap: 2px; min-width: 0; }
.card-title strong { overflow: hidden; text-overflow: ellipsis; }
.artifact-frame { border-top: 1px solid var(--border); }
.artifact-frame iframe { display: block; width: 100%; height: min(70vh, 560px); border: 0; background: #fff; border-radius: 0 0 var(--radius) var(--radius); }
.btn.small { min-height: 36px; padding: 0 14px; font-size: .9rem; }
.file-card { display: flex; align-items: center; gap: 12px; padding: 12px 14px; color: var(--text); text-decoration: none; }
.file-card:hover { border-color: var(--primary); }
.file-card svg { width: 22px; height: 22px; flex-shrink: 0; color: var(--primary); }
.file-card .card-title { flex: 1; }
.doc-row { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border: 1px solid var(--border); border-radius: 12px; }
.doc-row > svg, .doc-row > span > svg { width: 18px; height: 18px; }
.doc-row .card-title { flex: 1; }

.google-box { margin-bottom: 8px; }
.divider { display: flex; align-items: center; gap: 10px; color: var(--text-faint); font-size: .85rem; margin: 16px 0; }
.divider::before, .divider::after { content: ""; flex: 1; height: 1px; background: var(--border); }

.offline-banner { background: var(--warning-soft); color: var(--warning-text); text-align: center; padding: 8px 12px; font-size: .9rem; }
.install-banner {
  position: fixed; left: 50%; bottom: calc(16px + var(--safe-bottom)); transform: translateX(-50%); z-index: 40;
  display: flex; align-items: center; gap: 10px; padding: 10px 12px 10px 16px; border-radius: 16px;
  background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow); width: min(440px, calc(100vw - 32px));
}
.install-banner p { margin: 0; flex: 1; font-size: .92rem; }

/* --- Phase 4: admin panel ----------------------------------------------------------------- */

.admin-nav { flex: 1; overflow-y: auto; padding: 4px 8px 12px; display: grid; align-content: start; gap: 2px; }
.admin-nav a { padding: 9px 12px; border-radius: 9px; color: var(--text); text-decoration: none; font-size: .95rem; }
.admin-nav a:hover { background: var(--bg-soft); }
.admin-nav a[aria-current="page"] { background: var(--primary-soft); color: var(--primary-strong); font-weight: 600; }
.admin-inner { max-width: 1100px; margin: 0 auto; padding: 20px 16px 48px; }
.admin-content h2 { font-size: 1.1rem; margin: 28px 0 10px; }
.admin-content h3 { font-size: 1rem; margin: 18px 0 8px; }
.stats { display: grid; gap: 12px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); margin-bottom: 20px; }
.stat { display: grid; gap: 4px; padding: 14px 16px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.stat-label { color: var(--text-soft); font-size: .88rem; }
.stat-value { font-size: 1.6rem; font-weight: 650; letter-spacing: -.01em; }
.alert-callout {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; padding: 12px 16px; margin-bottom: 16px;
  border-radius: var(--radius); background: var(--danger-soft); color: var(--danger); text-decoration: none;
}
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
table.data { width: 100%; border-collapse: collapse; font-size: .92rem; }
table.data th, table.data td { padding: 9px 12px; text-align: left; border-bottom: 1px solid var(--border); vertical-align: top; }
table.data th { font-weight: 600; color: var(--text-soft); font-size: .82rem; background: var(--bg-soft); white-space: nowrap; }
table.data tr:last-child td { border-bottom: 0; }
table.data .num { text-align: right; font-variant-numeric: tabular-nums; }
table.data select { min-height: 32px; border-radius: 8px; border: 1px solid var(--border); background: var(--surface); padding: 0 6px; }
.card-form { margin-top: 20px; padding: 16px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.card-form h2 { margin-top: 0; }
.card-form textarea, .card-form select, .filters select, .card-form input, .filters input, .row input, .row select {
  width: 100%; min-height: 40px; padding: 8px 12px; border-radius: var(--radius-sm); border: 1px solid var(--border); background: var(--surface);
}
.row input[size] { width: auto; }
.grid-3 { display: grid; gap: 0 12px; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); }
.filters { display: flex; gap: 12px; flex-wrap: wrap; align-items: end; }
.filters .field { min-width: 160px; margin-bottom: 12px; }
.sev { padding: 2px 8px; border-radius: 99px; font-size: .8rem; font-weight: 600; background: var(--bg-soft); }
.sev-critical, .sev-high { background: var(--danger-soft); color: var(--danger); }
.sev-medium { background: var(--warning-soft); color: var(--warning-text); }
.transcript { display: grid; gap: 8px; margin: 12px 0; max-height: 420px; overflow-y: auto; padding: 8px; border: 1px solid var(--border); border-radius: var(--radius-sm); }
.tmsg p { margin: 2px 0 0; white-space: pre-wrap; }
.tmsg.user p { font-weight: 500; }

/* Chart (single series, see web/js/admin/chart.js) */
.chart-box { margin: 0 0 8px; padding: 14px 16px 8px; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.chart-box figcaption { font-weight: 600; margin-bottom: 8px; }
.chart-wrap { position: relative; }
.chart { width: 100%; height: auto; display: block; }
.chart-grid { stroke: var(--border); stroke-width: 1; }
.chart-axis { stroke: var(--text-faint); stroke-width: 1; }
.chart-tick { fill: var(--text-faint); font-size: 11px; font-variant-numeric: tabular-nums; }
.chart-bar { fill: var(--primary); }
.chart-hit { fill: transparent; }
.chart-col { cursor: default; outline: none; }
.chart-col:hover .chart-bar, .chart-col:focus .chart-bar { fill: var(--primary-strong); }
.chart-col:focus-visible .chart-hit { stroke: var(--focus); stroke-width: 2; }
.chart-tip[hidden] { display: none; }
.chart-tip {
  position: absolute; top: 0; transform: translateX(-50%); pointer-events: none; z-index: 2;
  display: grid; gap: 2px; padding: 8px 10px; border-radius: 10px; font-size: .85rem; white-space: nowrap;
  background: var(--surface); border: 1px solid var(--border); box-shadow: var(--shadow);
}

/* Biblioteca Digital Escolar */
.library-intro { margin: 0 0 14px; line-height: 1.5; }
.library-filters { display: flex; flex-wrap: wrap; gap: 8px; margin: 10px 0 16px; }
.library-filters select { flex: 1 1 180px; min-height: 44px; border-radius: 12px; border: 1px solid var(--border); background: var(--bg); color: var(--text); padding: 0 12px; font: inherit; }
.book-grid { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); }
.book-grid[aria-busy="true"] { opacity: .6; }
.book-card { display: grid; grid-template-columns: 84px 1fr; gap: 12px; padding: 12px; border: 1px solid var(--border); border-radius: 14px; background: var(--bg); height: 100%; }
.book-cover { width: 84px; aspect-ratio: 2 / 3; object-fit: cover; border-radius: 8px; background: var(--bg-soft); }
.book-cover.placeholder { display: grid; place-items: center; color: var(--text-faint); }
.book-cover.placeholder svg { width: 28px; height: 28px; }
.book-body { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.book-title { font-size: .98rem; margin: 0; line-height: 1.3; }
.book-author, .book-meta { margin: 0; font-size: .82rem; color: var(--text-soft); }
.book-desc { margin: 4px 0 0; font-size: .85rem; color: var(--text-soft); display: -webkit-box; -webkit-line-clamp: 4; line-clamp: 4; -webkit-box-orient: vertical; overflow: hidden; }
.book-link { margin-top: auto; padding-top: 8px; display: inline-flex; align-items: center; gap: 6px; font-size: .88rem; font-weight: 600; color: var(--primary); text-decoration: none; min-height: 32px; }
.book-link:hover { text-decoration: underline; }
.book-link svg { width: 15px; height: 15px; }
.books { margin-top: 10px; }
.books-head { display: flex; align-items: center; gap: 6px; margin: 0 0 8px; font-size: .85rem; color: var(--text-soft); }
.books-head svg { width: 16px; height: 16px; }
.books ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.book-card.compact { grid-template-columns: 56px 1fr; padding: 10px; }
.book-card.compact .book-cover { width: 56px; }

/* Conversation actions */
.conv-menu { position: relative; }
.menu-pop {
  position: absolute; right: 0; top: calc(100% + 6px); z-index: 30; min-width: 200px;
  display: grid; padding: 6px; border: 1px solid var(--border); border-radius: 12px;
  background: var(--bg); box-shadow: 0 10px 30px rgb(10 12 20 / 18%);
}
.menu-item {
  display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 0 12px; border: 0;
  border-radius: 8px; background: transparent; color: var(--text); font: inherit; text-align: left; cursor: pointer;
}
.menu-item:hover, .menu-item:focus-visible { background: var(--bg-soft); }
.menu-item svg { width: 18px; height: 18px; }
.menu-item.danger { color: var(--danger); }
.btn.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
.archived-link {
  display: flex; align-items: center; gap: 8px; margin: 8px 4px 0; padding: 8px 10px;
  border-radius: 9px; color: var(--text-soft); text-decoration: none; font-size: .88rem;
}
.archived-link:hover { background: var(--bg-soft); color: var(--text); }
.archived-link svg { width: 16px; height: 16px; }
.archived-note {
  display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; padding: 8px 12px;
  border-radius: 10px; background: var(--bg-soft); color: var(--text-soft); font-size: .88rem;
}
.archived-note svg { width: 16px; height: 16px; flex: none; }
.archived-note span { flex: 1 1 200px; }
.card-row { display: flex; align-items: center; gap: 8px; }
.card-row .card { flex: 1; min-width: 0; }
.toast {
  position: fixed; left: 50%; bottom: 24px; transform: translateX(-50%); z-index: 50;
  display: flex; align-items: center; gap: 14px; max-width: calc(100vw - 32px);
  padding: 12px 16px; border-radius: 12px; background: var(--text); color: var(--bg);
  box-shadow: 0 10px 30px rgb(10 12 20 / 25%); font-size: .92rem;
}
.toast .link-btn { color: var(--bg); font-weight: 700; text-decoration: underline; }