* { box-sizing: border-box; }

[hidden] {
  display: none !important;
}

:root {
  --bg-body: #0b0f12;
  --text-body: #e6edf3;
  --bg-header: #2596be;
  --border-header: #1f7e9e;
  --brand: #004d66;
  --doc-name: #dff6ff;
  --header-text: #f8fcff;
  --input-bg: #0b1620;
  --input-border: #243342;
  --button-bg: #0e1b25;
  --button-bg-hover: #13283a;
  --button-text: #c9d1d9;
  --button-border: #233243;
  --button-subtle-border: #2b4256;
  --button-subtle-text: #9fd3ff;
  --button-subtle-hover: #122537;
  --sidebar-bg: linear-gradient(180deg, #0b1116 0%, #0a0f13 100%);
  --sidebar-border: #16212b;
  --muted-text: #8b949e;
  --tab-text: #c9d1d9;
  --tab-hover-bg: #122537;
  --tab-hover-border: #1d3346;
  --tab-active-bg: #16293a;
  --tab-active-border: #35506a;
  --tab-add-border: #2b4256;
  --tab-add-text: #9fd3ff;
  --tab-input-border: #35506a;
  --tab-editing-bg: #122537;
  --tab-icon: #9fd3ff;
  --tab-icon-disabled: #6b7280;
  --tab-delete-armed: #f87171;
  --editor-bg: #0b0f12;
  --editor-readonly-bg: #0a0d10;
  --editor-readonly-border: #263241;
  --hint-bg: #0d141a;
  --footer-bg: #0d141a;
  --footer-border: #1b2732;
  --status-ok: #7ee787;
  --status-warn: #f2cc60;
  --status-err: #ff7b72;
  --toggle-idle-text: #7f8b96;
  --toggle-active-bg: #163149;
  --toggle-active-border: #4d7193;
  --toggle-active-text: #e6edf3;
}

:root[data-theme="light"] {
  --bg-body: #f5f7fb;
  --text-body: #17202a;
  --bg-header: #2596be;
  --border-header: #1f7e9e;
  --brand: #004d66;
  --doc-name: #dff6ff;
  --header-text: #f8fcff;
  --input-bg: #ffffff;
  --input-border: #c6d1de;
  --button-bg: #f3f6fa;
  --button-bg-hover: #e8eef5;
  --button-text: #223041;
  --button-border: #c8d3e0;
  --button-subtle-border: #bdd0e5;
  --button-subtle-text: #205d9c;
  --button-subtle-hover: #e7f0fa;
  --sidebar-bg: linear-gradient(180deg, #f8fbff 0%, #eef3f8 100%);
  --sidebar-border: #d8e0ea;
  --muted-text: #617286;
  --tab-text: #2b3746;
  --tab-hover-bg: #eaf2fb;
  --tab-hover-border: #c5d7eb;
  --tab-active-bg: #dceafb;
  --tab-active-border: #98b7da;
  --tab-add-border: #bdd0e5;
  --tab-add-text: #205d9c;
  --tab-input-border: #98b7da;
  --tab-editing-bg: #eaf2fb;
  --tab-icon: #2a67a5;
  --tab-icon-disabled: #94a0ad;
  --tab-delete-armed: #cb4a44;
  --editor-bg: #ffffff;
  --editor-readonly-bg: #f3f6fa;
  --editor-readonly-border: #c7d3e0;
  --hint-bg: #f6f9fc;
  --footer-bg: #ffffff;
  --footer-border: #d4dde8;
  --status-ok: #1f7a3e;
  --status-warn: #9a6a00;
  --status-err: #c0392b;
  --toggle-idle-text: #647586;
  --toggle-active-bg: #dceafb;
  --toggle-active-border: #98b7da;
  --toggle-active-text: #2596dd;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
  background: var(--bg-body);
  color: var(--text-body);
}

header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-header);
  background: var(--bg-header);
  color: var(--header-text);
  position: sticky;
  top: 0;
  z-index: 10;
}

h1 {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: 0.08em;
  color: var(--brand);
}

h1 a {
  color: inherit;
  text-decoration: none;
}

.doc-name {
  color: var(--doc-name);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.actions {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.password-controls {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.password-unlock-row,
.password-change-shell,
.password-change-panel {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.password-unlock-row label,
.password-change-shell label {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}

input[type=password] {
  background: var(--input-bg);
  color: var(--text-body);
  border: 1px solid var(--input-border);
  border-radius: 0.5rem;
  padding: 0.28rem 0.54rem;
  height: 1.85rem;
  line-height: 1;
}

#change-password-toggle {
  background: var(--button-bg);
  border-color: var(--button-subtle-border);
  color: var(--button-subtle-text);
}

#change-password-toggle:hover {
  background: var(--button-subtle-hover);
}

button {
  background: var(--button-bg);
  color: var(--button-text);
  border: 1px solid var(--button-border);
  border-radius: 0.6rem;
  padding: 0.28rem 0.63rem;
  line-height: 1;
  cursor: pointer;
}

header button {
  height: 1.85rem;
}

button:hover {
  background: var(--button-bg-hover);
}

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.workspace {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  height: calc(100vh - 6.25rem);
}

.sidebar {
  display: flex;
  flex-direction: column;
  min-width: 0;
  border-right: 1px solid var(--sidebar-border);
  background: var(--sidebar-bg);
}

.sidebar-heading {
  padding: 0.9rem 1rem 0.75rem;
  border-bottom: 1px solid var(--sidebar-border);
  color: var(--muted-text);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.tabs {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.5rem;
  overflow-y: auto;
}

.tab {
  display: flex;
  align-items: center;
  gap: 0.1rem;
  width: 100%;
  min-width: 0;
  min-height: 2rem;
  padding: 0.4rem 0.65rem;
  border: 1px solid transparent;
  border-radius: 0.45rem;
  background: transparent;
  color: var(--tab-text);
  font: inherit;
  text-align: left;
  box-shadow: none;
}

.tab.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.tab:hover {
  background: var(--tab-hover-bg);
  border-color: var(--tab-hover-border);
}

.tab.disabled:hover {
  background: transparent;
  border-color: transparent;
}

.tab.active {
  background: var(--tab-active-bg);
  border-color: var(--tab-active-border);
  color: var(--text-body);
}

.tab.add {
  margin-top: 0.45rem;
  border-style: dashed;
  border-color: var(--tab-add-border);
  color: var(--tab-add-text);
}

.tab-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  pointer-events: none;
}

.tab-rename-input {
  flex: 1;
  min-width: 0;
  height: 1.35rem;
  background: var(--input-bg);
  color: var(--text-body);
  border: 1px solid var(--tab-input-border);
  border-radius: 0.35rem;
  padding: 0 0.35rem;
  font-size: 0.92rem;
  line-height: 1.1;
  font-family: inherit;
  font-weight: inherit;
  margin: 0;
  outline: none;
}

.tab.editing {
  background: var(--tab-editing-bg);
  border-color: var(--tab-input-border);
}

.tab-edit,
.tab-close {
  flex: 0 0 auto;
  opacity: 0.9;
  cursor: pointer;
  user-select: none;
  line-height: 0;
}

.tab-edit {
  color: var(--tab-icon);
}

.tab-edit svg,
.tab-close svg {
  width: 1.25rem;
  height: 1.25rem;
  display: block;
}

main {
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: 100%;
}

.editor-shell {
  flex: 1;
  min-height: 0;
  min-width: 0;
}

.icon-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.85rem;
  height: 1.85rem;
  padding: 0;
  border-radius: 0.6rem;
  background: var(--button-bg);
  border-color: var(--button-subtle-border);
  color: var(--toggle-idle-text);
}

.icon-toggle:hover {
  background: var(--button-subtle-hover);
}

.icon-toggle.active {
  background: var(--toggle-active-bg);
  border-color: var(--toggle-active-border);
  color: var(--toggle-active-text);
}

.icon-toggle svg {
  width: 1.2rem;
  height: 1.2rem;
  display: block;
}

#editor {
  flex: 1;
  width: 100%;
  height: 100%;
  min-height: 0;
  padding: 1rem;
  background: var(--editor-bg);
  color: var(--text-body);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  font-size: 14px;
  line-height: 1.5;
  border: 0;
  outline: none;
  resize: none;
  overflow: auto;
  white-space: pre;
  overflow-wrap: normal;
  word-break: normal;
}

#editor.wrap-enabled {
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

#editor[readonly] {
  background: var(--editor-readonly-bg);
  border-top: 1px dashed var(--editor-readonly-border);
}

.printable {
  display: none;
  white-space: pre-wrap;
  padding: 1rem;
}

.locked-hint {
  padding: 0.7rem 1rem;
  color: var(--muted-text);
  border-bottom: 1px solid var(--sidebar-border);
  background: var(--hint-bg);
}

footer {
  padding: 0.45rem 1rem;
  font-size: 0.85rem;
  color: var(--muted-text);
  border-top: 1px solid var(--footer-border);
  background: var(--footer-bg);
}

.status-ok { color: var(--status-ok); }
.status-warn { color: var(--status-warn); }
.status-err { color: var(--status-err); }

.tab-close {
  margin-left: 0.15rem;
  color: var(--tab-icon);
}

.tab-close.armed {
  color: var(--tab-delete-armed);
}

.tab-edit:hover,
.tab-close:hover {
  opacity: 1;
}

.tab-edit.disabled,
.tab-close.disabled {
  color: var(--tab-icon-disabled);
  opacity: 0.5;
  cursor: not-allowed;
}

@media (max-width: 860px) {
  .workspace {
    grid-template-columns: 1fr;
    height: auto;
    min-height: calc(100vh - 6.25rem);
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--sidebar-border);
  }

  .tabs {
    max-height: 220px;
  }

  main {
    min-height: 50vh;
  }
}