:root {
  --bg: #FAF8F3;
  --surface: #FFFFFF;
  --panel: #F4F1EA;
  --ink: #0B0B0B;
  --body: #1F1D1A;
  --muted: #5A554E;
  --subtle: #8A857C;
  --line: #DDD8CE;
  --line-soft: #EAE5DA;
  --accent: #14365C;
  --accent-dark: #0A2542;
  --accent-soft: #E4ECF3;
  --warn: #93212F;
  --warn-soft: #F1E4E5;
  --good: #1F5C3F;
  --good-soft: #E1ECDF;

  --font-serif: "Merriweather", Charter, Georgia, serif;
  --font-sans: "Inter", ui-sans-serif, system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, Menlo, monospace;

  --sidebar-w: 280px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* Force-respect `hidden` attribute — beberapa class punya display:flex/grid
   yang menimpa UA default `[hidden]{display:none}`. */
[hidden] { display: none !important; }

html, body { height: 100%; }
html {
  /* iOS Safari minus URL bar — boleh -webkit-fill-available; aman karena overflow:hidden */
  height: -webkit-fill-available;
}
body {
  background: var(--bg);
  color: var(--body);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow: hidden;
  /* Cegah pull-to-refresh & bounce yang bikin layout terpotong */
  overscroll-behavior: none;
  /* iPhone notch top: tambah safe area kalau ada */
  padding-top: env(safe-area-inset-top, 0px);
}
body.has-modal { overflow: hidden; }

button { font-family: inherit; cursor: pointer; }

/* ── Icons ─────────────────────────────────────────────────────────── */
.icon {
  display: inline-block;
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  vertical-align: -2px;
}
.icon-sm { width: 13px; height: 13px; }
.icon-xs { width: 11px; height: 11px; }
.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }

/* ── Layout ────────────────────────────────────────────────────────── */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  /* Pakai dynamic viewport height supaya URL bar mobile yang collapse/expand
     tidak bikin chat content terpotong. 100dvh = current viewport actual.
     Fallback 100vh untuk browser lama. */
  height: 100vh;
  height: 100dvh;
}

/* ── Sidebar ───────────────────────────────────────────────────────── */
.sidebar {
  background: var(--panel);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  min-height: 0;
  overflow: hidden;
}

.sidebar-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--line);
}
.brand-min {
  display: inline-flex; align-items: center; gap: 0.55rem;
  color: var(--ink); text-decoration: none;
  flex: 1; min-width: 0;
}
.brand-min img { flex-shrink: 0; }
.brand-min__txt {
  display: flex; flex-direction: column; line-height: 1.05;
  min-width: 0;
}
.brand-min__name {
  font-family: var(--font-serif); font-size: 14px; font-weight: 700;
  color: var(--ink); letter-spacing: -0.005em;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.brand-min__sub {
  font-family: var(--font-mono); font-size: 8.5px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--accent); margin-top: 2px;
}
.sidebar-close { display: none; }

.icon-btn {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px;
  background: transparent; border: 1px solid transparent; color: var(--muted);
  cursor: pointer; transition: all 0.15s; border-radius: 0;
}
.icon-btn:hover { color: var(--ink); border-color: var(--line); background: var(--surface); }

.new-chat-btn {
  display: flex; align-items: center; justify-content: center; gap: 0.45rem;
  margin: 0.85rem; padding: 0.65rem 0.85rem;
  font-family: var(--font-sans); font-size: 13px; font-weight: 500;
  color: #fff; background: var(--accent); border: 1px solid var(--accent);
  border-radius: 0; transition: all 0.15s;
}
.new-chat-btn:hover { background: var(--accent-dark); border-color: var(--accent-dark); }

.sidebar-section-lbl {
  font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--subtle);
  padding: 0.5rem 1rem;
}

.session-list {
  list-style: none;
  flex: 1;
  overflow-y: auto;
  padding: 0 0.5rem 1rem;
}
.session-empty {
  padding: 1rem 0.85rem;
  font-size: 12.5px; color: var(--subtle); font-style: italic;
}

.session-item {
  position: relative;
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.55rem 0.7rem;
  margin-bottom: 2px;
  cursor: pointer;
  transition: background 0.15s;
  border-left: 2px solid transparent;
}
.session-item:hover { background: var(--surface); }
.session-item.is-active {
  background: var(--accent-soft);
  border-left-color: var(--accent);
}
.session-item__title {
  flex: 1;
  font-size: 13px;
  line-height: 1.35;
  color: var(--body);
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
}
.session-item.is-active .session-item__title { color: var(--ink); font-weight: 500; }
.session-item__menu {
  visibility: hidden;
  display: inline-flex; align-items: center; justify-content: center;
  width: 22px; height: 22px;
  background: transparent; border: 0; color: var(--muted);
  cursor: pointer; flex-shrink: 0;
}
.session-item:hover .session-item__menu,
.session-item.is-active .session-item__menu { visibility: visible; }
.session-item__menu:hover { color: var(--warn); }

/* ── Sidebar books section ─────────────────────────────────────────── */
.sidebar-books {
  border-top: 1px solid var(--line);
  flex-shrink: 0;
  max-height: 40vh;
  display: flex; flex-direction: column;
  overflow: hidden;
}
.sidebar-books[open] { max-height: 50vh; }
.sidebar-section-lbl--head { padding-top: 0.85rem; }
.sidebar-section-lbl--toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  cursor: pointer;
  user-select: none;
  list-style: none;
  font-family: var(--font-mono); font-size: 9.5px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--subtle);
  padding: 0.5rem 1rem;
}
.sidebar-section-lbl--toggle::-webkit-details-marker { display: none; }
.sidebar-section-lbl--toggle::after {
  content: '▸';
  transition: transform 0.18s;
  font-size: 10px;
  color: var(--muted);
}
.sidebar-books[open] .sidebar-section-lbl--toggle::after { transform: rotate(90deg); }
.sidebar-section-count {
  margin-left: auto;
  padding: 1px 5px;
  background: var(--surface);
  border: 1px solid var(--line);
  font-size: 8.5px;
  color: var(--muted);
}

.book-list {
  list-style: none;
  overflow-y: auto;
  padding: 0 0.5rem 0.5rem;
}
.book-list__empty {
  padding: 0.5rem 0.85rem;
  font-size: 11.5px; color: var(--subtle); font-style: italic;
}
.book-list__item {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.55rem;
  cursor: pointer;
  font-size: 12px;
  color: var(--body);
  background: transparent;
  border: 1px solid transparent;
  width: 100%;
  text-align: left;
  font-family: var(--font-sans);
  transition: all 0.15s;
}
.book-list__item:hover {
  background: var(--surface);
  border-color: var(--line);
}
.book-list__item .icon { color: var(--good); }
.book-list__item span {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.book-list__item small {
  font-family: var(--font-mono); font-size: 9px;
  color: var(--subtle);
  flex-shrink: 0;
}

/* ── Sidebar footer + re-index ─────────────────────────────────────── */
.sidebar-foot {
  border-top: 1px solid var(--line);
  padding: 0.55rem 0.7rem;
  display: flex; flex-direction: column;
  gap: 0.4rem;
}
.sidebar-tool {
  display: flex; align-items: center; gap: 0.45rem;
  font-family: var(--font-sans); font-size: 11.5px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  padding: 0.4rem 0.6rem; border-radius: 0;
  transition: all 0.15s;
  width: 100%;
  cursor: pointer;
}
.sidebar-tool:hover:not(:disabled) {
  color: var(--ink);
  border-color: var(--ink);
}
.sidebar-tool:disabled { opacity: 0.5; cursor: not-allowed; }
.sidebar-tool.is-running .icon { animation: spin 1.2s linear infinite; }
@keyframes spin { from { transform: rotate(0); } to { transform: rotate(360deg); } }
.ingest-status {
  margin-left: auto;
  font-family: var(--font-mono); font-size: 9.5px;
  color: var(--accent);
  letter-spacing: 0.06em;
}
.ingest-status.is-error { color: var(--warn); }

.device-id {
  font-family: var(--font-mono); font-size: 9.5px;
  letter-spacing: 0.06em; color: var(--subtle);
  padding: 0 0.3rem;
}

/* ── Main ──────────────────────────────────────────────────────────── */
.main { display: flex; flex-direction: column; min-height: 0; }

.topbar {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 1.25rem;
  border-bottom: 1px solid var(--line);
  background: rgba(250, 248, 243, 0.92);
  backdrop-filter: blur(8px);
  flex-shrink: 0;
}
.sidebar-toggle { display: none; }
.topbar-title { flex: 1; min-width: 0; }
.topbar-title__session {
  font-family: var(--font-serif); font-size: 13.5px; font-weight: 700; color: var(--ink);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
  display: block;
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 9px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent);
}
/* Composer inline controls (toggle + level + model) — pindah dari topbar */
.toggle, .select-pill {
  display: inline-flex; align-items: center; gap: 0.35rem;
  cursor: pointer;
  padding: 0.3rem 0.55rem;
  border: 1px solid var(--line);
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--muted);
  transition: border-color 0.15s, color 0.15s;
  border-radius: 0;
}
.toggle:hover, .select-pill:hover { border-color: var(--accent); }

.toggle input[type=checkbox] { margin: 0; cursor: pointer; accent-color: var(--good); }
.toggle input[type=checkbox]:checked ~ .toggle-icon,
.toggle input[type=checkbox]:checked ~ .toggle-label { color: var(--good); }
.toggle-icon { color: var(--muted); }
.toggle-label { font-size: 11px; letter-spacing: 0.06em; }

.select-pill .icon { color: var(--accent); }
.select-pill__lbl {
  font-size: 9.5px;
  color: var(--accent);
  letter-spacing: 0.14em;
}
.select-pill select {
  font-family: var(--font-sans); font-size: 11.5px;
  color: var(--ink);
  border: 0; background: transparent;
  padding: 0; cursor: pointer;
  outline: 0;
  /* Auto-width: select grow ke lebar konten — "Data Scientist" tidak ter-clip */
  min-width: 4ch;
  width: auto;
}

#app {
  flex: 1;
  overflow-y: auto;
  max-width: 820px;
  width: 100%;
  margin: 0 auto;
  padding: 2.5rem 1.25rem 1rem;
}

.hero { text-align: center; padding-top: 3vh; }
.eyebrow {
  font-family: var(--font-mono);
  font-size: 10px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 1rem;
}
.hero-title {
  font-family: var(--font-serif);
  font-size: clamp(28px, 4vw, 42px); font-weight: 700;
  line-height: 1.18; letter-spacing: -0.015em;
  color: var(--ink); margin-bottom: 0.85rem;
}
.hero-sub {
  font-size: 14.5px; color: var(--muted); line-height: 1.6;
  max-width: 540px; margin: 0 auto;
}
.corpus-status {
  display: block;
  font-size: 11.5px;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--subtle);
  margin-top: 0.5rem;
}

.suggestions {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  grid-auto-rows: 1fr;
  gap: 0.55rem;
  margin: 2rem auto 0;
  max-width: 640px;
  padding: 0;
  text-align: left;
  align-items: stretch;
}
.suggestions li { display: flex; height: 100%; }
.suggestions button {
  display: flex; flex-direction: column; gap: 0.3rem;
  text-align: left;
  width: 100%;
  height: 100%;
  background: var(--surface); border: 1px solid var(--line);
  padding: 0.85rem 0.95rem; border-radius: 0;
  font-family: var(--font-sans);
  transition: border-color 0.15s, transform 0.15s;
}
.suggestions button:hover { border-color: var(--accent); transform: translateY(-1px); }
.suggestions button strong { font-size: 13.5px; font-weight: 600; color: var(--ink); line-height: 1.35; }
.suggestions button span { font-size: 12px; color: var(--muted); line-height: 1.5; }

/* ── Messages thread ───────────────────────────────────────────────── */
.thread { display: flex; flex-direction: column; gap: 1.5rem; padding-top: 0.5rem; }

.msg {
  border-left: 2px solid var(--line);
  padding: 0.25rem 0 0.5rem 0.95rem;
  position: relative;
}
.msg--user { border-left-color: var(--accent); }
.msg--error { border-left-color: var(--warn); background: var(--warn-soft); padding: 0.6rem 0.85rem; }

.msg-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.5rem;
}
.msg-head__left {
  display: inline-flex; align-items: center; gap: 0.6rem;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--muted);
}
.msg-head__right { display: inline-flex; gap: 0.35rem; }
.msg--user .msg-head__left { color: var(--accent); }
.msg-role { font-weight: 500; }
.level-chip {
  background: var(--accent-soft); color: var(--accent);
  padding: 1px 6px; font-size: 9px; letter-spacing: 0.12em;
}
.model-chip { color: var(--subtle); font-size: 9.5px; }

.msg-copy {
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-family: var(--font-sans); font-size: 11px;
  color: var(--muted);
  background: transparent; border: 1px solid var(--line);
  padding: 0.2rem 0.5rem; border-radius: 0;
  transition: all 0.15s;
}
.msg-copy:hover { color: var(--ink); border-color: var(--ink); }
.msg-copy.is-copied { color: var(--good); border-color: var(--good); background: var(--good-soft); }

/* ── Markdown body ─────────────────────────────────────────────────── */
.msg-body {
  font-size: 15px; line-height: 1.7; color: var(--body);
  word-wrap: break-word;
}
.msg-body p { margin: 0 0 0.85em; }
.msg-body p:last-child { margin-bottom: 0; }
.msg-body strong { color: var(--ink); font-weight: 700; }
.msg-body em { font-style: italic; }
.msg-body a { color: var(--accent); text-decoration: underline; text-decoration-thickness: 1px; text-underline-offset: 2px; }
.msg-body a:hover { color: var(--accent-dark); }

.msg-body h1, .msg-body h2, .msg-body h3, .msg-body h4 {
  font-family: var(--font-serif);
  color: var(--ink);
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 1.25em 0 0.5em;
  line-height: 1.25;
}
.msg-body h1 { font-size: 1.6em; }
.msg-body h2 { font-size: 1.35em; }
.msg-body h3 { font-size: 1.18em; }
.msg-body h4 { font-size: 1.05em; }

.msg-body ul, .msg-body ol {
  padding-left: 1.45em;
  margin: 0.6em 0;
}
.msg-body li { margin: 0.25em 0; }
.msg-body li > ul, .msg-body li > ol { margin: 0.3em 0; }

.msg-body blockquote {
  border-left: 3px solid var(--accent-soft);
  padding: 0.35em 0 0.35em 1em;
  margin: 0.85em 0;
  color: var(--muted);
  font-style: italic;
}

.msg-body hr {
  border: 0; border-top: 1px solid var(--line);
  margin: 1.25em 0;
}

/* Inline code */
.msg-body code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.87em;
  background: var(--line-soft);
  color: var(--accent-dark);
  padding: 1px 5px;
  border-radius: 0;
}

/* Code block (rendered by marked.renderer.code) */
.code-block {
  position: relative;
  margin: 0.85em 0;
  border: 1px solid var(--line);
  background: var(--panel);
}
.code-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.35rem 0.7rem;
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}
.code-lang {
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--muted);
}
.code-copy {
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-family: var(--font-sans); font-size: 11px;
  color: var(--muted);
  background: transparent; border: 1px solid transparent;
  padding: 0.15rem 0.45rem; border-radius: 0;
  transition: all 0.15s;
}
.code-copy:hover { color: var(--ink); border-color: var(--line); background: var(--bg); }
.code-copy.is-copied { color: var(--good); border-color: var(--good); background: var(--good-soft); }

.code-block pre {
  margin: 0;
  padding: 0.9rem 1rem;
  overflow-x: auto;
}
.code-block code {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.55;
  color: var(--ink);
  background: transparent;
  display: block;
}

/* Tables */
.md-table-wrap { overflow-x: auto; margin: 0.85em 0; }
.md-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  border: 1px solid var(--line);
}
.md-table th, .md-table td {
  padding: 0.5em 0.75em;
  border: 1px solid var(--line);
  text-align: left;
}
.md-table thead {
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}
.md-table tbody tr:nth-child(even) { background: var(--bg); }

/* Mermaid */
.mermaid-wrap {
  margin: 1em 0;
  padding: 1rem;
  background: var(--surface);
  border: 1px solid var(--line);
  text-align: center;
  overflow-x: auto;
}
.mermaid-wrap pre.mermaid { display: inline-block; text-align: left; }
.md-error {
  padding: 0.6em 0.85em;
  background: var(--warn-soft); color: var(--warn);
  border: 1px solid var(--warn);
  font-family: var(--font-mono); font-size: 12px;
  margin: 1em 0;
}

/* KaTeX overrides */
.katex { font-size: 1.02em; }
.katex-display { margin: 1em 0; overflow-x: auto; overflow-y: hidden; }

/* ── Sources ───────────────────────────────────────────────────────── */
/* ── Citation chip (inline di markdown body) ───────────────────────── */
.citation {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  vertical-align: 1px;
  margin: 0 1px;
  padding: 1px 6px 1px 5px;
  font-family: var(--font-mono);
  font-size: 0.78em;
  font-weight: 500;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid color-mix(in oklab, var(--accent) 18%, transparent);
  cursor: pointer;
  transition: all 0.15s;
  user-select: none;
}
.citation:hover, .citation:focus-visible {
  background: color-mix(in oklab, var(--accent-soft) 70%, var(--accent) 12%);
  border-color: var(--accent);
  outline: none;
  transform: translateY(-1px);
}
.citation .icon {
  width: 9px; height: 9px;
  opacity: 0.7;
}
.citation__id {
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.citation--orphan {
  background: var(--warn-soft);
  border-color: var(--warn);
  color: var(--warn);
  animation: shake 0.32s;
}
@keyframes shake {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-2px); }
  75% { transform: translateX(2px); }
}

/* Pill highlight saat citation diklik */
.source-pill.is-highlighted {
  animation: pill-pulse 1.6s ease-out;
  outline: 2px solid var(--accent);
  outline-offset: 1px;
}
@keyframes pill-pulse {
  0%   { background: var(--accent); color: #fff; }
  100% { background: var(--accent-soft); color: var(--accent); }
}
.source-pill--book.is-highlighted { outline-color: var(--good); }
.source-pill--book.is-highlighted { animation-name: pill-pulse-good; }
@keyframes pill-pulse-good {
  0%   { background: var(--good); color: #fff; }
  100% { background: var(--good-soft); color: var(--good); }
}

.msg-sources {
  display: flex; flex-wrap: wrap; gap: 0.35rem;
  margin-top: 0.85rem; padding-top: 0.65rem;
  border-top: 1px dashed var(--line-soft);
}
.source-pill {
  display: inline-flex; align-items: center; gap: 0.3rem;
  font-family: var(--font-mono); font-size: 10.5px;
  text-decoration: none;
  padding: 3px 7px; border: 1px solid transparent;
  transition: all 0.15s;
  cursor: pointer;
  background: var(--accent-soft);
}
.source-pill .src-id { font-weight: 600; }
.source-pill .src-section { color: var(--muted); margin-left: 4px; }
.source-pill--doc { color: var(--accent); background: var(--accent-soft); }
.source-pill--doc:hover { border-color: var(--accent); }
.source-pill--book {
  color: var(--good);
  background: var(--good-soft);
  border: 1px solid transparent;
}
.source-pill--book:hover { border-color: var(--good); }
.source-pill--book .src-section { color: var(--muted); }
.src-ext { opacity: 0.7; margin-left: 2px; }

.msg-actions { display: flex; gap: 0.5rem; margin-top: 0.75rem; }
.msg-actions button {
  font-family: var(--font-sans); font-size: 11.5px; color: var(--muted);
  background: transparent; border: 1px solid var(--line);
  padding: 0.25rem 0.55rem; border-radius: 0;
  transition: all 0.15s;
}
.msg-actions button:hover { color: var(--ink); border-color: var(--ink); }

.dots { display: inline-flex; gap: 4px; }
.dots span {
  width: 6px; height: 6px; background: var(--subtle); display: inline-block;
  animation: blink 1.2s infinite ease-in-out;
}
.dots span:nth-child(2) { animation-delay: 0.15s; }
.dots span:nth-child(3) { animation-delay: 0.3s; }
@keyframes blink { 0%,80%,100% { opacity: 0.25; } 40% { opacity: 1; } }

/* ── Composer ──────────────────────────────────────────────────────── */
.composer {
  padding: 0.75rem 1.25rem 1.25rem;
  /* iPhone notch / Android navigation bar: tambah safe-area-inset-bottom */
  padding-bottom: calc(1.25rem + env(safe-area-inset-bottom, 0px));
  border-top: 1px solid var(--line-soft);
  background: var(--bg);
  flex-shrink: 0;
}
.composer > * { max-width: 820px; margin-inline: auto; width: 100%; }

.input-wrap {
  border: 1px solid var(--line);
  background: var(--surface);
  transition: border-color 0.15s;
}
.input-wrap:focus-within { border-color: var(--accent); }
.input-wrap textarea {
  width: 100%; border: 0; outline: 0; background: transparent; resize: none;
  font-family: var(--font-sans); font-size: 15px; line-height: 1.55;
  color: var(--body); padding: 0.9rem 1rem 0.55rem;
  max-height: 240px; overflow-y: auto;
}
.input-wrap textarea::placeholder { color: var(--subtle); }

.input-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.4rem 0.65rem 0.55rem 0.65rem;
  border-top: 1px solid var(--line-soft);
}
.input-bar__controls {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  flex-wrap: wrap;
  flex: 1;
}
@media (max-width: 540px) {
  /* Mobile: drop prefix label "Level" + icon CPU di model picker, kompak padding —
     dropdown value sendiri sudah jadi indikator (Auto/Pemula/GPT-5.4/dll). */
  .toggle-label { display: none; }
  .select-pill__lbl { display: none; }
  .select-pill .icon { display: none; }
  .input-bar__controls { gap: 0.3rem; }
  .select-pill {
    padding: 0.3rem 0.45rem;
  }
  .select-pill select {
    font-size: 11px;
  }
  .toggle {
    padding: 0.3rem 0.45rem;
  }
}

.primary-btn {
  font-family: var(--font-sans); font-size: 13px; font-weight: 500;
  background: var(--accent); color: #fff; border: 1px solid var(--accent);
  padding: 0.45rem 1rem; border-radius: 0;
  transition: all 0.15s;
}
.primary-btn:hover:not(:disabled) { background: var(--accent-dark); border-color: var(--accent-dark); }
.primary-btn:disabled { opacity: 0.4; cursor: not-allowed; }

.ghost-btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-sans); font-size: 12.5px;
  color: var(--muted);
  background: transparent;
  border: 1px solid var(--line);
  padding: 0.45rem 0.85rem; border-radius: 0;
  transition: all 0.15s;
}
.ghost-btn:hover { color: var(--ink); border-color: var(--ink); }

/* ── Book preview modal ────────────────────────────────────────────── */
.book-preview {
  position: fixed; inset: 0;
  z-index: 30;
  display: flex; align-items: center; justify-content: center;
}
.book-preview__backdrop {
  position: absolute; inset: 0;
  background: rgba(11, 11, 11, 0.6);
  cursor: pointer;
}
.book-preview__sheet {
  position: relative;
  background: var(--surface);
  border: 1px solid var(--line);
  width: min(92vw, 920px);
  max-height: 92vh;
  display: flex; flex-direction: column;
  box-shadow: 0 20px 60px rgba(0,0,0,0.3);
  animation: sheet-in 0.18s ease-out;
}
@keyframes sheet-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.book-preview__head {
  display: flex; align-items: center; justify-content: space-between;
  gap: 0.85rem;
  padding: 0.85rem 1.1rem;
  border-bottom: 1px solid var(--line);
}
.book-preview__title-wrap {
  display: inline-flex; align-items: center; gap: 0.65rem;
  min-width: 0; flex: 1;
}
.book-preview__title-wrap .icon { color: var(--good); width: 18px; height: 18px; }
.book-preview__title {
  font-family: var(--font-serif); font-weight: 700; font-size: 14.5px;
  color: var(--ink);
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.book-preview__page {
  font-family: var(--font-mono); font-size: 10px;
  letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted); margin-top: 1px;
}
.book-preview__actions { display: inline-flex; gap: 0.25rem; flex-shrink: 0; }

.book-preview__body {
  flex: 1;
  overflow: auto;
  background: var(--panel);
  display: flex; align-items: flex-start; justify-content: center;
  padding: 1.25rem;
  min-height: 0;
}
.book-preview__body img {
  max-width: 100%;
  height: auto;
  background: #fff;
  box-shadow: 0 4px 14px rgba(0,0,0,0.12);
}
.book-preview__loader {
  font-family: var(--font-mono); font-size: 12px;
  color: var(--muted);
  padding: 3rem 1rem;
  text-align: center;
}

.book-preview__foot {
  display: flex; justify-content: flex-end;
  gap: 0.5rem;
  padding: 0.65rem 1.1rem;
  border-top: 1px solid var(--line);
  background: var(--bg);
}

/* ── Toast ─────────────────────────────────────────────────────────── */
.toast {
  position: fixed;
  bottom: 1rem; left: 50%;
  transform: translateX(-50%);
  background: var(--ink); color: #fff;
  font-family: var(--font-sans); font-size: 13px;
  padding: 0.55rem 1rem;
  border-radius: 0;
  z-index: 50;
  box-shadow: 0 8px 24px rgba(0,0,0,0.18);
  animation: toast-in 0.18s ease-out;
}
@keyframes toast-in { from { opacity: 0; transform: translate(-50%, 8px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ── Sidebar backdrop (mobile) ─────────────────────────────────────── */
.sidebar-backdrop {
  position: fixed; inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 14;
}

/* ── Responsive ────────────────────────────────────────────────────── */
@media (max-width: 760px) {
  .layout {
    grid-template-columns: 1fr;
    /* Layout-level dvh sudah di atas — di sini override jika perlu */
  }
  .sidebar {
    position: fixed; inset: 0 auto 0 0;
    width: min(86vw, 320px);
    height: 100vh;
    height: 100dvh;            /* sidebar drawer juga ikut dvh */
    z-index: 15;
    transform: translateX(-100%);
    transition: transform 0.2s ease;
  }
  .sidebar.is-open { transform: translateX(0); }
  .sidebar-close { display: inline-flex; }
  .sidebar-toggle { display: inline-flex; }

  .topbar { padding: 0.55rem 0.75rem; }
  .topbar-actions { gap: 0.3rem; }
  .toggle, .level-picker { font-size: 9px; }
  .level-picker select { font-size: 11px; padding: 0.25rem 0.4rem; }

  #app {
    padding: 1.25rem 1rem 0.5rem;
  }
  .composer {
    padding: 0.5rem 1rem 0.75rem;
    padding-bottom: calc(0.75rem + env(safe-area-inset-bottom, 0px));
  }

  /* Composer sticky di mobile: tetap visible saat keyboard muncul */
  .composer .input-wrap textarea {
    /* iOS auto-zoom prevention sudah di-inherit di breakpoint ini */
    font-size: 16px;
  }

  .book-preview__head { padding: 0.65rem 0.85rem; }
  .book-preview__title { font-size: 13px; }
}

/* iOS Safari fallback: gunakan webkit-fill-available kalau dvh belum dikenali */
@supports not (height: 100dvh) {
  .layout { height: -webkit-fill-available; }
  .sidebar { height: -webkit-fill-available; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}