:root {
  color-scheme: dark;
  --bg: #000000;
  --surface: #16181c;
  --border: #2f3336;
  --text: #e7e9ea;
  --muted: #71767b;
  --accent: #6d8dff;
  --accent-hover: #8aa4ff;
  --danger: #ff6b6b;
  --radius: 10px;
  --field-bg: #0a0b0d;
  --accent-glow: rgba(109, 141, 255, 0.25);
  --accent-deep: #35509e;
  --active-line-bg: rgba(255, 255, 255, 0.04);
  --selection-bg: rgba(109, 141, 255, 0.4);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f5f6f8;
  --surface: #ffffff;
  --border: #e2e4e9;
  --text: #1c1f26;
  --muted: #6b7280;
  --accent: #3b6fe0;
  --accent-hover: #2f5bc4;
  --danger: #d64545;
  --field-bg: #f0f1f3;
  --accent-glow: rgba(59, 111, 224, 0.22);
  --accent-deep: #1f4aa8;
  --active-line-bg: rgba(0, 0, 0, 0.035);
  --selection-bg: rgba(59, 111, 224, 0.28);
}

* { box-sizing: border-box; }

html, body {
  overflow-x: hidden; /* invisible absolutely-positioned tooltips still count
    toward scrollable width even at opacity:0 - this stops them from ever
    creating page-level horizontal scroll, without clipping their visible rendering */
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
}

/* ---- Landing page ---- */
body.landing {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 24px;
}

.landing-main {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
}

.card {
  width: 100%;
  max-width: 420px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
}

.card h1 {
  margin: 0 0 8px;
  font-size: 1.6rem;
}

.logo-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  color: #fff;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.85rem;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: 6px;
  margin-right: 8px;
  box-shadow: 0 2px 0 var(--accent-deep);
  vertical-align: middle;
}

.tagline {
  color: var(--muted);
  margin: 0 0 24px;
  font-size: 0.95rem;
}

.error {
  color: var(--danger);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.row {
  display: flex;
  gap: 8px;
}

.row input {
  flex: 1;
  min-width: 0;
}

input, select, button {
  font: inherit;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--field-bg);
  color: var(--text);
  padding: 10px 14px;
}

input:focus, select:focus, button:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

select {
  cursor: pointer;
  border-color: var(--accent);
  font-size: 0.82rem;
  font-weight: 600;
  padding: 7px 12px;
  box-shadow: 0 2px 0 var(--accent-deep), 0 3px 6px rgba(0, 0, 0, 0.15);
  transition: box-shadow 0.12s ease;
}
select:hover { box-shadow: 0 2px 0 var(--accent-deep), 0 0 0 4px var(--accent-glow); }

/* The open dropdown list is a native browser popup - <option> elements don't
   inherit our theme at all by default, so style them explicitly or they fall
   back to a light background that can clash badly with light/accent text. */
select option {
  background: var(--field-bg);
  color: var(--text);
}

/* Lightweight custom tooltips (data-tooltip="...") - instant + themed, unlike
   native title tooltips which are slow and can't be styled. Note: ::before/
   ::after don't reliably apply to replaced elements (select/input), so wrap
   those in a plain element (e.g. <span data-tooltip>) instead of tagging them directly. */
[data-tooltip] {
  position: relative;
}
[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 9px);
  left: 50%;
  transform: translate(-50%, 4px);
  background: var(--surface);
  color: var(--text);
  border: 1px solid var(--accent);
  padding: 5px 9px;
  border-radius: 6px;
  font-size: 0.72rem;
  font-weight: 500;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity 0.15s ease, transform 0.15s ease;
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.3);
  z-index: 60;
}
[data-tooltip]::before {
  content: "";
  position: absolute;
  bottom: calc(100% + 5px);
  left: 50%;
  transform: translate(-50%, 4px);
  border: 5px solid transparent;
  border-top-color: var(--accent);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 60;
}
[data-tooltip]:hover::after, [data-tooltip]:focus-visible::after,
[data-tooltip]:hover::before, [data-tooltip]:focus-visible::before {
  opacity: 1;
  visibility: visible;
  transform: translate(-50%, 0);
}

/* Elements near the top of the viewport would clip an "above" tooltip off-screen - flip those to appear below instead. */
.topbar [data-tooltip]::after, .theme-toggle-corner[data-tooltip]::after {
  bottom: auto;
  top: calc(100% + 9px);
  transform: translate(-50%, -4px);
}
.topbar [data-tooltip]::before, .theme-toggle-corner[data-tooltip]::before {
  bottom: auto;
  top: calc(100% + 5px);
  transform: translate(-50%, -4px);
  border-top-color: transparent;
  border-bottom-color: var(--accent);
}
.topbar [data-tooltip]:hover::after, .topbar [data-tooltip]:focus-visible::after,
.topbar [data-tooltip]:hover::before, .topbar [data-tooltip]:focus-visible::before,
.theme-toggle-corner[data-tooltip]:hover::after, .theme-toggle-corner[data-tooltip]:focus-visible::after,
.theme-toggle-corner[data-tooltip]:hover::before, .theme-toggle-corner[data-tooltip]:focus-visible::before {
  transform: translate(-50%, 0);
}

button {
  cursor: pointer;
  background: transparent;
  border-color: var(--accent);
  color: var(--accent);
  font-weight: 600;
  font-size: 0.82rem;
  padding: 7px 12px;
  box-shadow: 0 2px 0 var(--accent-deep), 0 3px 6px rgba(0, 0, 0, 0.15);
  transition: background 0.12s ease, color 0.12s ease, box-shadow 0.12s ease, transform 0.08s ease;
}

button:hover { background: var(--accent); color: #fff; box-shadow: 0 2px 0 var(--accent-deep), 0 0 0 4px var(--accent-glow); }
button:active { transform: translateY(2px); box-shadow: 0 0 0 var(--accent-deep); }

button.primary {
  width: 100%;
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  border-color: var(--accent);
  color: white;
  font-weight: 700;
  font-size: 0.95rem;
  padding: 11px 14px;
  box-shadow: 0 4px 0 var(--accent-deep), 0 8px 18px var(--accent-glow);
}

button.primary:hover {
  background: linear-gradient(135deg, var(--accent-hover), var(--accent));
  box-shadow: 0 4px 0 var(--accent-deep), 0 10px 22px var(--accent-glow);
}
button.primary:active { transform: translateY(4px); box-shadow: 0 0 0 var(--accent-deep); }

.divider {
  display: flex;
  align-items: center;
  color: var(--muted);
  font-size: 0.8rem;
  margin: 20px 0;
}
.divider::before, .divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--border);
}
.divider span { padding: 0 10px; }

/* ---- Room page ---- */
body.room {
  display: flex;
  flex-direction: column;
  height: 100vh;
  height: 100dvh; /* accounts for mobile browsers' address bar showing/hiding */
}

.topbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 10px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}

.room-code {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.brand {
  display: flex;
  align-items: center;
  font-weight: 700;
  font-size: 0.85rem;
  padding-right: 10px;
  margin-right: 2px;
  border-right: 1px solid var(--border);
  white-space: nowrap;
}
.brand .logo-mark {
  font-size: 0.7rem;
  padding: 1px 5px;
  margin-right: 6px;
}

/* The topbar is already tight with controls - keep just the logo mark below this width. */
@media (max-width: 860px) {
  .brand-text { display: none; }
  .brand { padding-right: 6px; margin-right: 0; }
}

.room-code-badge {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 5px 12px;
  border: 1px solid var(--accent);
  border-radius: 999px;
  background: var(--field-bg);
}

.room-code-badge .label {
  color: var(--muted);
  font-size: 0.78rem;
}

.room-code-badge strong {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 1rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.05em;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.tooltip-wrap {
  display: inline-flex;
}

.status {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--muted);
  background: var(--field-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 4px 10px;
  min-width: 70px;
  white-space: nowrap;
}
.status.saving { color: var(--accent); border-color: var(--accent); }
.status.error { color: var(--danger); border-color: var(--danger); }

.expiry {
  font-size: 0.8rem;
  color: var(--muted);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.expiry.expiry-critical { color: var(--danger); }

.tab-bar {
  display: flex;
  align-items: center;
  gap: 2px;
  padding: 6px 10px 0;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
}

.tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-bottom: none;
  border-radius: 6px 6px 0 0;
  background: var(--field-bg);
  color: var(--muted);
  font-size: 0.82rem;
  cursor: pointer;
  white-space: nowrap;
}
.tab:hover { color: var(--text); }
.tab.active {
  background: var(--bg);
  color: var(--text);
  border-color: var(--border);
  box-shadow: inset 0 -2px 0 var(--accent);
}

.tab-rename,
.tab-close {
  border: none;
  background: none;
  padding: 0;
  color: inherit;
  font-size: 0.85rem;
  line-height: 1;
  opacity: 0.6;
}
.tab-rename:hover { opacity: 1; background: none; }
.tab-close:hover { color: var(--danger); opacity: 1; background: none; }

.tab-add {
  padding: 5px 9px;
  font-size: 0.85rem;
  line-height: 1;
  background: none;
  border: 1px dashed var(--accent);
  border-radius: 6px;
  color: var(--accent);
  box-shadow: 0 2px 0 var(--accent-deep);
  transition: background 0.12s ease, color 0.12s ease, box-shadow 0.12s ease, transform 0.08s ease;
}
.tab-add:hover { color: #fff; background: var(--accent); box-shadow: 0 2px 0 var(--accent-deep), 0 0 0 4px var(--accent-glow); }
.tab-add:active { transform: translateY(2px); box-shadow: 0 0 0 var(--accent-deep); }

#editor {
  flex: 1;
  overflow: auto;
}

.cm-editor {
  height: 100%;
  font-size: 14px;
}

/* CodeMirror injects its own default active-line highlight color at runtime,
   so it never picks up our theme - override it directly to something subtle. */
.cm-editor .cm-activeLine {
  background-color: var(--active-line-bg) !important;
}
.cm-editor .cm-activeLineGutter {
  background-color: var(--active-line-bg) !important;
}

/* Same problem for text selection - CodeMirror draws its own selection
   overlay (not native browser ::selection) with a default light-mode color
   that ignores our theme entirely, making light text on it unreadable. */
.cm-editor .cm-selectionBackground {
  background-color: var(--selection-bg) !important;
}
.cm-editor.cm-focused .cm-selectionBackground {
  background-color: var(--selection-bg) !important;
}

.footnote {
  position: relative;
  display: flex;
  justify-content: center;
  color: var(--muted);
  font-size: 0.78rem;
  padding: 10px 16px;
  margin: 0;
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.footnote::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 15%;
  right: 15%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0.6;
}

.footnote-box {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 6px;
  max-width: 100%;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--field-bg);
}

.footnote-icon {
  font-size: 0.85rem;
  filter: grayscale(0.2);
}

.footnote-label {
  font-weight: 600;
  color: var(--text);
}

.ext-chips {
  display: inline-flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 4px;
}

.ext-chip {
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.66rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--field-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 5px;
}

.uploads {
  border-top: 1px solid var(--border);
  background: var(--surface);
  padding: 10px 16px;
}

.uploads-header {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 12px;
}

.upload-btn {
  position: relative;
  display: inline-block;
  overflow: hidden; /* contains the file input below - see its comment for why */
  cursor: pointer;
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  border-radius: 8px;
  padding: 7px 12px;
  font-size: 0.82rem;
  font-weight: 600;
  box-shadow: 0 2px 0 var(--accent-deep), 0 3px 6px rgba(0, 0, 0, 0.12);
  transition: background 0.12s ease, color 0.12s ease, box-shadow 0.12s ease, transform 0.08s ease;
}
.upload-btn:hover { background: var(--accent); color: #fff; box-shadow: 0 2px 0 var(--accent-deep), 0 0 0 4px var(--accent-glow); }
.upload-btn:active { transform: translateY(2px); box-shadow: 0 0 0 var(--accent-deep); }
.upload-btn input[type="file"] {
  /* A native file input's real rendered content (OS "Choose file" control)
     ignores width/height constraints and silently extends the *parent's*
     scrollable width even at inset:0 - hence overflow:hidden on .upload-btn
     above, which clips the oversized native rendering without affecting
     click-through (the visible/clickable region is still the input). */
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.usage {
  display: inline-flex;
  align-items: center;
  font-family: "SF Mono", Menlo, Consolas, monospace;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--field-bg);
  border: 1px solid var(--accent);
  border-radius: 999px;
  padding: 4px 10px;
}
.usage.usage-warning {
  color: var(--danger);
  border-color: var(--danger);
}

.file-list {
  list-style: none;
  margin: 10px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.file-list li {
  display: flex;
  align-items: center;
  gap: 6px;
  background: var(--field-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 0.82rem;
}

.file-list a {
  color: var(--accent);
  text-decoration: none;
}
.file-list a:hover { text-decoration: underline; }

.file-list .size {
  color: var(--muted);
}

.file-remove {
  border: none;
  background: none;
  padding: 0 0 0 2px;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1;
}
.file-remove:hover { color: var(--danger); background: none; }

.theme-toggle {
  padding: 5px 9px;
  font-size: 0.85rem;
  line-height: 1;
}

.theme-toggle-corner {
  position: fixed;
  top: 16px;
  right: 16px;
}

.site-footer {
  text-align: center;
  padding: 14px 8px;
}
.footer-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.78rem;
  color: var(--muted);
  padding: 5px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--surface);
}
.site-footer a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}
.site-footer a:hover { text-decoration: underline; }