:root {
  --bg: #f3f5fb;
  --panel: #ffffff;
  --text: #20283a;
  --muted: #607090;
  --line: #ccd5e5;
  --accent: #2463eb;
  --accent-weak: #d7e3ff;
  --danger: #b22234;
  --ok: #0f8b4c;
  --glow: rgba(36, 99, 235, 0.12);
}

body.dark-mode {
  --bg: #111827;
  --panel: #1d2638;
  --text: #f0f4ff;
  --muted: #b5c3e4;
  --line: #33425f;
  --accent: #6fa5ff;
  --accent-weak: #2a3b60;
  --danger: #ff6d79;
  --ok: #54d696;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Manrope', 'Avenir Next', 'Segoe UI', sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at 10% 10%, rgba(36, 99, 235, 0.18), transparent 30%),
    radial-gradient(circle at 90% 0%, rgba(15, 139, 76, 0.13), transparent 35%),
    linear-gradient(180deg, var(--bg), #d9e1f3);
  min-height: 100vh;
}

body.dark-mode {
  background: linear-gradient(180deg, var(--bg), #0b1220);
}

main.shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 18px;
}

main.public-shell {
  min-height: 100vh;
  padding-top: 22px;
  padding-bottom: 22px;
}

main.login-shell {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 18px;
}

.login-card,
.panel,
.canvas-card {
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 10px 28px rgba(16, 24, 40, 0.08);
}

.login-card {
  width: min(420px, 100%);
}

.public-toolbar {
  margin-bottom: 16px;
}

.public-login-panel {
  width: min(560px, 100%);
  margin: 0 auto;
}

h1,
h2,
h3,
h4 {
  margin: 0 0 8px;
}

p {
  margin: 8px 0;
}

.muted {
  color: var(--muted);
  font-size: 0.92rem;
}

.error-text,
.ok-text {
  padding: 10px 12px;
  border-radius: 10px;
  margin: 12px 0;
}

.error-text {
  background: rgba(178, 34, 52, 0.14);
  color: var(--danger);
  border: 1px solid rgba(178, 34, 52, 0.35);
}

.ok-text {
  background: rgba(15, 139, 76, 0.14);
  color: var(--ok);
  border: 1px solid rgba(15, 139, 76, 0.35);
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.stack.compact {
  gap: 4px;
}

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

.inline.two-col > label {
  flex: 1 1 240px;
}

label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.92rem;
}

.inline-toggle {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 8px;
}

input,
textarea,
select,
button {
  font: inherit;
}

input,
textarea,
select {
  border-radius: 10px;
  border: 1px solid var(--line);
  padding: 9px 10px;
  background: var(--panel);
  color: var(--text);
}

select[multiple] {
  min-height: 110px;
}

button {
  border: 1px solid var(--accent);
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  padding: 9px 12px;
  cursor: pointer;
  transition: transform 0.14s ease, box-shadow 0.18s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 18px var(--glow);
}

button.secondary,
button.active-tab {
  color: var(--text);
  border-color: var(--line);
  background: var(--panel);
}

button.active-tab {
  border-color: var(--accent);
  background: var(--accent-weak);
}

button.danger {
  border-color: var(--danger);
  background: var(--danger);
}

button:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.topbar {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  margin-bottom: 14px;
}

.topbar-actions {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.toolbar {
  margin-bottom: 14px;
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
}

.canvas-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.canvas-card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-height: 180px;
  border: 1px solid transparent;
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    linear-gradient(145deg, color-mix(in srgb, var(--accent) 45%, transparent), color-mix(in srgb, var(--ok) 35%, transparent)) border-box;
}

.canvas-card.card-view {
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    linear-gradient(145deg, #2f80ed66, #56ccf266) border-box;
}

.canvas-card.card-edit {
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    linear-gradient(145deg, #f39c1260, #f1c40f55) border-box;
}

.canvas-card.card-compare {
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    linear-gradient(145deg, #16a08566, #2ecc7160) border-box;
}

.canvas-card.card-settings {
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    linear-gradient(145deg, #8e44ad66, #3498db66) border-box;
}

.canvas-card.card-flashcards {
  background:
    linear-gradient(var(--panel), var(--panel)) padding-box,
    linear-gradient(145deg, #e67e2266, #c0392b66) border-box;
}

.dashboard-stack {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.dashboard-section,
.service-header {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.dashboard-hero {
  background:
    linear-gradient(125deg, color-mix(in srgb, var(--accent) 10%, var(--panel)), var(--panel));
}

.dashboard-stats {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}

.metric-card {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.metric-card strong {
  font-size: 1.7rem;
  line-height: 1;
}

.refresh-tile {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px;
  background: color-mix(in srgb, var(--panel) 86%, var(--accent-weak) 14%);
}

.service-nav {
  justify-content: flex-start;
}

.chips {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}

.chip {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 10px;
  font-size: 0.85rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--panel);
}

.chip.active {
  border-color: var(--accent);
  background: var(--accent-weak);
}

.chip.read-only {
  opacity: 0.85;
}

.schedule-wrapper {
  margin-top: 10px;
  overflow: auto;
  max-height: 70vh;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.schedule-grid {
  display: grid;
  width: 100%;
  min-width: 720px;
  background: var(--panel);
}

.grid-cell {
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 4px 6px;
  min-height: 30px;
}

.grid-cell.sticky {
  position: sticky;
  top: 0;
  z-index: 2;
}

.head-cell {
  background: color-mix(in srgb, var(--panel) 90%, var(--accent-weak) 10%);
  font-weight: 600;
  min-height: 36px;
}

.time-cell {
  color: var(--muted);
  font-size: 0.85rem;
  text-align: right;
  user-select: none;
}

.slot-cell {
  padding: 0;
  position: relative;
  user-select: none;
  touch-action: none;
  overflow: visible;
}

.slot-cell.slot-selecting {
  box-shadow: inset 0 0 0 9999px rgba(36, 99, 235, 0.22);
}

.slot-cell.slot-has-event {
  color: #0b1220;
}

.event-pill {
  width: 100%;
  border: 0;
  border-radius: 0;
  text-align: left;
  background: transparent;
  color: #0b1220;
  padding: 4px 6px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-height: 26px;
  position: relative;
  z-index: 1;
}

.event-pill.read-only {
  cursor: default;
}

.now-indicator {
  position: absolute;
  left: 0;
  right: 0;
  height: 14px;
  transform: translateY(-50%);
  pointer-events: none;
  z-index: 3;
}

.event-pill strong {
  font-size: 0.76rem;
  line-height: 1.2;
}

.event-pill span {
  font-size: 0.7rem;
  opacity: 0.9;
}

.settings-form {
  max-width: 700px;
}

.mfa-panel {
  margin-top: 16px;
  border: 1px dashed var(--line);
  border-radius: 14px;
  padding: 12px;
}

.mfa-row {
  display: flex;
  gap: 10px;
  align-items: flex-end;
  flex-wrap: wrap;
}

.mfa-row > label {
  flex: 1 1 220px;
}

.mfa-qr {
  width: 150px;
  max-width: 100%;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: #fff;
  padding: 6px;
}

.admin-section {
  margin-top: 20px;
  border-top: 1px dashed var(--line);
  padding-top: 16px;
}

.admin-user-list {
  display: grid;
  gap: 12px;
}

.admin-user-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  background: color-mix(in srgb, var(--panel) 92%, var(--accent-weak) 8%);
}

.admin-user-card-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.admin-user-card-actions {
  display: flex;
  justify-content: flex-end;
}

.mfa-output {
  margin-top: 12px;
  border: 1px dashed var(--line);
  border-radius: 10px;
  padding: 10px;
}

pre {
  white-space: pre-wrap;
  word-break: break-word;
  margin: 8px 0;
  font-size: 0.82rem;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(7, 10, 19, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  z-index: 30;
}

.modal-card {
  width: min(560px, 100%);
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--panel);
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.modal-card.admin-user-modal {
  width: min(680px, 100%);
  max-height: min(88vh, 760px);
  overflow-y: auto;
}

.modal-actions {
  display: flex;
  gap: 8px;
  justify-content: flex-end;
  flex-wrap: wrap;
}

.flashcard-grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(280px, 360px) minmax(0, 1fr);
}

.flashcard-panel,
.flashcard-editor-shell {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.flashcard-sidebar,
.flashcard-detail {
  min-height: 420px;
}

.flashcard-heading {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.flashcard-stack-list,
.flashcard-card-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.flashcard-stack-item,
.flashcard-edit-card,
.study-item,
.study-result {
  width: 100%;
  text-align: left;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 92%, var(--accent-weak) 8%);
  color: var(--text);
  border-radius: 14px;
  padding: 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  box-shadow: none;
}

.flashcard-stack-item.selected {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--panel) 78%, var(--accent-weak) 22%);
}

.flashcard-card-preview {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 10px 12px;
  background: color-mix(in srgb, var(--panel) 95%, var(--accent-weak) 5%);
}

.flashcard-card-preview summary {
  cursor: pointer;
  display: flex;
  gap: 10px;
  align-items: center;
}

.flashcard-copy {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px;
  background: color-mix(in srgb, var(--panel) 90%, var(--accent-weak) 10%);
}

.flashcard-copy.answer {
  border-color: color-mix(in srgb, var(--ok) 35%, var(--line));
}

.flashcard-media {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.flashcard-media img {
  max-width: 100%;
  max-height: 260px;
  object-fit: contain;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 90%, white 10%);
}

.flashcard-choice {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 10px 12px;
  background: var(--panel);
}

.flashcard-choice.selected {
  border-color: var(--accent);
  background: var(--accent-weak);
}

.study-result.correct {
  border-color: color-mix(in srgb, var(--ok) 45%, var(--line));
}

.study-result.incorrect {
  border-color: color-mix(in srgb, var(--danger) 45%, var(--line));
}

.flashcard-file-input {
  position: relative;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 9px 12px;
  cursor: pointer;
  background: var(--panel);
}

.flashcard-file-input input {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}

.empty-state {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 240px;
}

@media (max-width: 980px) {
  .topbar {
    flex-direction: column;
  }

  .topbar-actions {
    justify-content: flex-start;
  }

  .toolbar {
    grid-template-columns: 1fr;
  }

  .mfa-row {
    flex-direction: column;
    align-items: stretch;
  }

  .flashcard-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  main.shell {
    padding: 12px;
  }

  main.public-shell {
    padding-top: 12px;
    padding-bottom: 12px;
  }

  .panel,
  .canvas-card,
  .login-card {
    border-radius: 12px;
    padding: 12px;
  }

  .schedule-grid {
    min-width: 620px;
  }
}