/* One stylesheet for the landing page, login page and to-do list.
   Colours are variables so light and dark mode share every rule below. */
:root {
  --page-background: #f5f6f8;
  --card-background: #ffffff;
  --text: #1c1f26;
  --muted-text: #5f6673;
  --border: #d9dde4;
  --accent: #3b5bdb;
  --accent-text: #ffffff;
  --danger: #c92a2a;
  --drag-highlight: #e7ecff;
}

@media (prefers-color-scheme: dark) {
  :root {
    --page-background: #14161a;
    --card-background: #1e2127;
    --text: #e8eaee;
    --muted-text: #9aa1ad;
    --border: #353a44;
    --accent: #748ffc;
    --accent-text: #10131a;
    --danger: #ff8787;
    --drag-highlight: #2a3152;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 16px;
  background: var(--page-background);
  color: var(--text);
  font: 16px/1.5 system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
}

h2 {
  margin: 0 0 4px;
  font-size: 1.125rem;
}

a {
  color: var(--accent);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
}

/* ---- Shared layout ---- */

.page-header,
.app-grid,
.todo-page {
  max-width: 720px;
  margin: 0 auto;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 0 20px;
}

.header-links {
  display: flex;
  align-items: center;
  gap: 16px;
}

/* ---- Buttons and inputs ---- */

input[type='text'],
input[type='email'],
input[type='password'] {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--card-background);
  color: var(--text);
  font: inherit;
}

button {
  font: inherit;
  cursor: pointer;
}

.primary-button {
  padding: 10px 18px;
  border: 0;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  font-weight: 600;
}

.quiet-button {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--muted-text);
}

.error-message {
  min-height: 1.5em;
  margin: 8px 0;
  color: var(--danger);
}

.small-print {
  color: var(--muted-text);
  font-size: 0.875rem;
  overflow-wrap: anywhere;
}

/* ---- Landing page ---- */

.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
}

.app-box {
  display: block;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-background);
  color: var(--text);
  text-decoration: none;
}

.app-box p {
  margin: 0;
  color: var(--muted-text);
}

a.app-box:hover,
a.app-box:focus-visible {
  border-color: var(--accent);
}

.app-box.is-not-connected {
  opacity: 0.55;
}

/* ---- Login page ---- */

.login-card {
  max-width: 380px;
  margin: 10vh auto 0;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--card-background);
}

.login-card form {
  display: grid;
  gap: 8px;
  margin: 16px 0 12px;
}

.login-card .primary-button {
  margin-top: 8px;
}

.authenticator-qr {
  display: block;
  width: 200px;
  height: 200px;
  margin: 0 auto;
  /* QR codes need a light background to scan, including in dark mode. */
  background: #ffffff;
  padding: 8px;
  border-radius: 8px;
}

/* ---- To-do list ---- */

.add-task-form {
  display: flex;
  gap: 8px;
}

.task-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.task-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 8px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card-background);
}

.task-row.is-dragging {
  border-color: var(--accent);
  background: var(--drag-highlight);
}

.drag-handle {
  padding: 6px 8px;
  border: 0;
  background: transparent;
  color: var(--muted-text);
  font-size: 1.25rem;
  line-height: 1;
  cursor: grab;
  /* Without this, a touch drag on the handle scrolls the page instead. */
  touch-action: none;
}

.task-checkbox {
  width: 22px;
  height: 22px;
  flex: none;
  accent-color: var(--accent);
}

.task-title,
.task-title-input {
  flex: 1;
  min-width: 0;
  overflow-wrap: anywhere;
}

.icon-button {
  flex: none;
  padding: 6px 8px;
  border: 0;
  background: transparent;
  color: var(--muted-text);
}

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

.is-done-list .task-title {
  color: var(--muted-text);
  text-decoration: line-through;
}

.empty-message {
  color: var(--muted-text);
}

.done-section {
  margin-top: 24px;
}

.done-section summary {
  margin-bottom: 8px;
  color: var(--muted-text);
  cursor: pointer;
}