/* ---------- Tokens ---------- */
:root {
  --bg: #f6f9fc;
  --bg-grad: radial-gradient(1200px 600px at 80% -10%, #eef2ff 0%, transparent 60%),
    radial-gradient(900px 500px at -10% 10%, #f0f9ff 0%, transparent 55%), #f6f9fc;
  --surface: #ffffff;
  --surface-2: #fbfbfd;
  --border: #e6ebf1;
  --border-strong: #d7dde5;
  --text: #0a2540;
  --text-muted: #425466;
  --text-subtle: #6b7c93;
  --accent: #635bff;
  --accent-2: #00d4ff;
  --accent-press: #4f46e5;
  --shadow-sm: 0 1px 2px rgba(10, 37, 64, 0.04), 0 1px 1px rgba(10, 37, 64, 0.03);
  --shadow-md: 0 4px 8px -2px rgba(10, 37, 64, 0.08), 0 2px 4px -2px rgba(10, 37, 64, 0.06);
  --shadow-lg: 0 24px 48px -12px rgba(10, 37, 64, 0.16);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --code-bg: #f6f9fc;
  --kbd-bg: #ffffff;
  --kbd-border: #e6ebf1;
  --selection: rgba(99, 91, 255, 0.18);
}

[data-theme='dark'] {
  --bg: #0a0e1a;
  --bg-grad: radial-gradient(1200px 600px at 80% -10%, #1a1d3a 0%, transparent 60%),
    radial-gradient(900px 500px at -10% 10%, #0f1a2e 0%, transparent 55%), #0a0e1a;
  --surface: #11151f;
  --surface-2: #0d111a;
  --border: #1f2533;
  --border-strong: #2a3142;
  --text: #e6e9ef;
  --text-muted: #a3acbd;
  --text-subtle: #7a8497;
  --accent: #8b85ff;
  --accent-2: #00d4ff;
  --accent-press: #6b65d6;
  --code-bg: #0d111a;
  --kbd-bg: #1a1f2c;
  --kbd-border: #2a3142;
  --selection: rgba(139, 133, 255, 0.28);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 8px -2px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 24px 48px -12px rgba(0, 0, 0, 0.55);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  height: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-feature-settings: 'cv11', 'ss01', 'ss03', 'cv02';
  background: var(--bg-grad);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

::selection {
  background: var(--selection);
}

/* ---------- Toolbar ---------- */
.toolbar {
  position: sticky;
  top: 0;
  z-index: 30;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 60px;
  padding: 0 22px;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(14px);
  -webkit-backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid var(--border);
}

[data-theme='dark'] .toolbar {
  background: rgba(13, 17, 26, 0.72);
}

.toolbar__left,
.toolbar__right {
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text);
}

.brand__mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 2px 6px rgba(99, 91, 255, 0.35);
}

.brand__text {
  font-size: 15px;
}

.filename {
  margin-left: 6px;
  padding-left: 14px;
  border-left: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
  max-width: 40vw;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Buttons */
.btn,
.icon-btn,
.seg__btn {
  font-family: inherit;
  font-size: 13px;
  font-weight: 500;
  line-height: 1;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background 120ms ease, color 120ms ease, border-color 120ms ease,
    box-shadow 120ms ease, transform 120ms ease;
  color: var(--text);
  background: transparent;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 34px;
  padding: 0 12px;
}

.btn svg {
  opacity: 0.85;
}

.btn--ghost {
  color: var(--text-muted);
  border-color: transparent;
}

.btn--ghost:hover {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.btn--primary {
  background: linear-gradient(180deg, var(--accent) 0%, var(--accent-press) 100%);
  color: #fff;
  border-color: transparent;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.3) inset, 0 1px 2px rgba(10, 37, 64, 0.12),
    0 4px 14px rgba(99, 91, 255, 0.35);
  height: 38px;
  padding: 0 16px;
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.3) inset, 0 2px 4px rgba(10, 37, 64, 0.14),
    0 10px 22px rgba(99, 91, 255, 0.42);
}

.btn--primary:active {
  transform: translateY(0);
}

.icon-btn {
  width: 34px;
  height: 34px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
}

.icon-btn:hover {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.icon-btn--danger {
  width: 28px;
  height: 28px;
  color: var(--text-subtle);
  border-radius: 8px;
}

.icon-btn--danger:hover {
  color: #e0245e;
  background: rgba(224, 36, 94, 0.08);
  border-color: transparent;
  box-shadow: none;
}

[data-theme='dark'] .icon-btn--danger:hover {
  color: #ff5c8a;
  background: rgba(255, 92, 138, 0.12);
}

body[data-state='empty'] #removeBtn {
  display: none;
}

/* Segmented control */
.seg {
  display: inline-flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 3px;
  box-shadow: var(--shadow-sm);
}

.seg__btn {
  height: 26px;
  padding: 0 12px;
  border-radius: 7px;
  color: var(--text-muted);
  background: transparent;
  font-size: 12.5px;
  font-weight: 500;
}

.seg__btn:hover {
  color: var(--text);
}

.seg__btn.is-active {
  background: var(--bg);
  color: var(--text);
  box-shadow: 0 1px 2px rgba(10, 37, 64, 0.06);
}

[data-theme='dark'] .seg__btn.is-active {
  background: #1a1f2c;
}

/* ---------- Stage ---------- */
.stage {
  flex: 1;
  display: flex;
  justify-content: center;
  padding: 48px 180px 96px;
  position: relative;
  /* When the TOC is visible, this is overridden in the media query below
     so the doc centers in the remaining space rather than the full viewport. */
}

@media (min-width: 1341px) {
  body[data-state='loaded']:not([data-view='source']) .stage {
    padding-left: 320px; /* 32 (toc-left) + 200 (toc-width) + 88 (gap) */
  }
}

.stage__inner {
  width: min(760px, 100%);
  display: flex;
  flex-direction: column;
  align-items: stretch;
}

/* ---------- Table of contents ---------- */
.toc {
  position: fixed;
  top: 96px;
  left: 32px;
  width: 200px;
  max-height: calc(100vh - 140px);
  overflow-y: auto;
  padding: 4px 8px 16px;
  font-size: 13px;
  color: var(--text-muted);
  scrollbar-width: thin;
  scrollbar-color: var(--border-strong) transparent;
}

.toc::-webkit-scrollbar {
  width: 6px;
}
.toc::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 999px;
}

.toc__label {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-subtle);
  padding: 0 10px 10px;
}

.toc__list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-left: 1px solid var(--border);
}

.toc__item {
  margin: 0;
}

.toc__link {
  position: relative;
  display: block;
  padding: 5px 10px 5px 14px;
  margin-left: -1px;
  color: var(--text-muted);
  text-decoration: none;
  border-left: 1px solid transparent;
  border-radius: 0;
  font-size: 13px;
  line-height: 1.45;
  transition: color 120ms ease, border-color 120ms ease, background 120ms ease;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.toc__link:hover {
  color: var(--text);
}

.toc__link.is-active {
  color: var(--accent);
  border-left-color: var(--accent);
  font-weight: 500;
}

.toc__item--h3 .toc__link {
  padding-left: 26px;
  font-size: 12.5px;
}
.toc__item--h4 .toc__link {
  padding-left: 38px;
  font-size: 12.5px;
}
.toc__item--h5 .toc__link,
.toc__item--h6 .toc__link {
  padding-left: 50px;
  font-size: 12.5px;
}

.toc__empty {
  padding: 6px 12px;
  color: var(--text-subtle);
  font-style: italic;
}

body[data-state='empty'] .toc,
body[data-view='source'] .toc {
  display: none;
}

/* Scroll-margin so anchor jumps clear the sticky toolbar */
.doc :is(h1, h2, h3, h4, h5, h6) {
  scroll-margin-top: 80px;
}

.hint {
  margin: 0 0 12px;
  padding: 0 4px;
  font-size: 12.5px;
  color: var(--text-subtle);
  text-align: center;
  letter-spacing: 0.005em;
}

body[data-state='empty'] .hint {
  display: none;
}

.doc,
.source {
  width: 100%;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 64px clamp(28px, 6vw, 72px);
  box-shadow: var(--shadow-lg);
  color: var(--text);
}

body[data-state='empty'] .doc,
body[data-state='empty'] .source {
  display: none;
}

body[data-state='loaded'] .empty {
  display: none;
}

body:not([data-view='source']) .source {
  display: none;
}

body[data-view='source'] .doc {
  display: none;
}

body[data-view='source'] .source {
  display: block;
}

.source {
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 13.5px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-wrap: break-word;
  color: var(--text-muted);
}

/* ---------- Empty state ---------- */
.empty {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  pointer-events: none;
}

.empty__card {
  pointer-events: auto;
  width: min(520px, 100%);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 40px 36px;
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.empty__icon {
  width: 52px;
  height: 52px;
  margin: 0 auto 18px;
  border-radius: 14px;
  background: linear-gradient(135deg, rgba(99, 91, 255, 0.1) 0%, rgba(0, 212, 255, 0.1) 100%);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
}

.empty__card h1 {
  margin: 0 0 8px;
  font-size: 22px;
  letter-spacing: -0.015em;
  font-weight: 600;
}

.empty__card p {
  margin: 0 0 22px;
  color: var(--text-muted);
  font-size: 14.5px;
  line-height: 1.55;
}

.empty__card em {
  color: var(--text);
  font-style: normal;
  font-weight: 500;
}

.empty__actions {
  display: flex;
  gap: 8px;
  justify-content: center;
  margin-bottom: 22px;
}

.empty__hint {
  font-size: 12px;
  color: var(--text-subtle);
  display: flex;
  gap: 4px;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
}

kbd {
  display: inline-flex;
  align-items: center;
  height: 20px;
  padding: 0 6px;
  margin: 0 1px;
  font-family: inherit;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--kbd-bg);
  border: 1px solid var(--kbd-border);
  border-bottom-width: 2px;
  border-radius: 5px;
}

/* ---------- Dropzone ---------- */
.dropzone {
  position: fixed;
  inset: 0;
  background: rgba(99, 91, 255, 0.08);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 40;
  opacity: 0;
  pointer-events: none;
  transition: opacity 120ms ease;
}

.dropzone.is-active {
  opacity: 1;
  pointer-events: auto;
}

.dropzone__inner {
  padding: 28px 56px;
  background: var(--surface);
  border: 2px dashed var(--accent);
  border-radius: var(--radius-lg);
  font-weight: 600;
  color: var(--accent);
  box-shadow: var(--shadow-lg);
}

/* ---------- Toast ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 24px;
  transform: translateX(-50%) translateY(20px);
  background: var(--text);
  color: var(--surface);
  font-size: 13px;
  font-weight: 500;
  padding: 10px 16px;
  border-radius: 999px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease, transform 160ms ease;
  z-index: 50;
  box-shadow: var(--shadow-lg);
}

.toast.is-show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- Document typography ---------- */
.doc {
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: -0.003em;
  color: var(--text);
}

.doc > *:first-child {
  margin-top: 0;
}

.doc > *:last-child {
  margin-bottom: 0;
}

.doc h1,
.doc h2,
.doc h3,
.doc h4,
.doc h5,
.doc h6 {
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text);
  line-height: 1.25;
  margin: 2em 0 0.6em;
}

.doc h1 {
  font-size: 2.1em;
  margin-top: 0.2em;
  letter-spacing: -0.025em;
}

.doc h2 {
  font-size: 1.55em;
  padding-bottom: 0.3em;
  border-bottom: 1px solid var(--border);
}

.doc h3 {
  font-size: 1.25em;
}

.doc h4 {
  font-size: 1.05em;
}

.doc p,
.doc ul,
.doc ol,
.doc blockquote,
.doc table,
.doc pre {
  margin: 1em 0;
}

.doc a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 120ms ease;
}

.doc a:hover {
  border-bottom-color: var(--accent);
}

.doc strong {
  font-weight: 600;
  color: var(--text);
}

.doc em {
  color: var(--text);
}

.doc ul,
.doc ol {
  padding-left: 1.4em;
}

.doc li {
  margin: 0.35em 0;
}

.doc li::marker {
  color: var(--text-subtle);
}

.doc blockquote {
  margin-left: 0;
  padding: 0.4em 1.1em;
  color: var(--text-muted);
  border-left: 3px solid var(--accent);
  background: linear-gradient(90deg, rgba(99, 91, 255, 0.04), transparent 70%);
  border-radius: 4px;
}

.doc blockquote > *:first-child {
  margin-top: 0;
}

.doc blockquote > *:last-child {
  margin-bottom: 0;
}

.doc hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.4em 0;
}

.doc code {
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  font-size: 0.88em;
  background: var(--code-bg);
  padding: 0.15em 0.4em;
  border-radius: 5px;
  border: 1px solid var(--border);
  color: var(--text);
}

.doc pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  overflow-x: auto;
  font-size: 13.5px;
  line-height: 1.6;
}

.doc pre code {
  background: transparent;
  border: none;
  padding: 0;
  font-size: inherit;
}

.doc table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95em;
  display: block;
  overflow-x: auto;
}

.doc th,
.doc td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
}

.doc th {
  font-weight: 600;
  color: var(--text-muted);
  background: var(--surface-2);
  font-size: 0.85em;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.doc img {
  max-width: 100%;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.doc input[type='checkbox'] {
  margin-right: 6px;
  accent-color: var(--accent);
}

.doc kbd {
  font-size: 0.85em;
}

/* ---------- Arabic / RTL ---------- */
.doc[dir='rtl'] {
  font-family: 'IBM Plex Sans Arabic', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
    sans-serif;
  font-size: 16.5px;
  line-height: 1.85;
  letter-spacing: 0;
  text-align: right;
}

.doc[dir='rtl'] :is(h1, h2, h3, h4, h5, h6) {
  font-family: 'IBM Plex Sans Arabic', 'Inter', sans-serif;
  letter-spacing: 0;
  line-height: 1.4;
}

.doc[dir='rtl'] h1 {
  font-size: 2em;
}

/* Lists: flip the indent side */
.doc[dir='rtl'] ul,
.doc[dir='rtl'] ol {
  padding-left: 0;
  padding-right: 1.6em;
}

/* Blockquote: border + soft tint on the right side */
.doc[dir='rtl'] blockquote {
  border-left: none;
  border-right: 3px solid var(--accent);
  background: linear-gradient(-90deg, rgba(99, 91, 255, 0.04), transparent 70%);
}

/* Tables read right-to-left too */
.doc[dir='rtl'] th,
.doc[dir='rtl'] td {
  text-align: right;
}

/* Inline code keeps LTR direction so identifiers render correctly */
.doc[dir='rtl'] code,
.doc[dir='rtl'] pre {
  direction: ltr;
  text-align: left;
  font-family: ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
}

/* ---------- Print ---------- */
@media print {
  body {
    background: #fff;
  }
  .toolbar,
  .empty,
  .dropzone,
  .toast,
  .toc,
  .hint {
    display: none !important;
  }
  .stage {
    padding: 0;
  }
  .doc {
    box-shadow: none;
    border: none;
    padding: 0;
    width: 100%;
  }
}

/* ---------- Responsive ---------- */
@media (max-width: 1340px) {
  .toc {
    display: none;
  }
}

@media (max-width: 720px) {
  .toolbar {
    padding: 0 14px;
    gap: 8px;
  }
  .brand__text,
  .filename {
    display: none;
  }
  .btn span {
    display: none;
  }
  .btn {
    padding: 0 10px;
  }
  .stage {
    padding: 24px 14px 64px;
  }
  .doc,
  .source {
    padding: 36px 22px;
    border-radius: var(--radius-lg);
  }
}