/* ================================================================
   FlashcardQuiz — app shell + all views
   ================================================================ */

body { min-height: 100vh; }

/* ---------------------------------------------------------------- top nav */

.app-topnav {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--topnav-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  z-index: 60;
}

.topnav-left { display: flex; align-items: center; gap: 10px; min-width: 0; }

.menu-btn { display: none; }

.topnav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand-mark {
  width: 32px; height: 32px;
  border-radius: 9px;
  background: var(--grad);
  color: var(--on-accent);
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}
.brand-mark img {
  width: 100%; height: 100%;
  object-fit: cover;
  border-radius: inherit;
  display: block;
}

.brand-name { display: inline; }

.topnav-search {
  flex: 1;
  max-width: 420px;
  margin: 0 auto;
  position: relative;
}

.topnav-search .search-icon {
  position: absolute;
  left: 12px; top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
}

.topnav-search input {
  width: 100%;
  height: 36px;
  padding: 0 14px 0 36px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 13.5px;
  transition: border var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
.topnav-search input::placeholder { color: var(--text-muted); }
.topnav-search input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface-elevated);
  box-shadow: var(--shadow-glow);
}

.topnav-right {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: auto;
}

.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  height: 32px;
  padding: 0 12px;
  border-radius: 999px;
  background: var(--amber-soft);
  color: var(--amber);
  font-size: 12.5px;
  font-weight: 600;
  white-space: nowrap;
  user-select: none;
}

.platform-chip {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
}

.avatar {
  width: 32px; height: 32px;
  border-radius: 50%;
  background: var(--grad);
  color: var(--on-accent);
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 700;
  user-select: none;
  flex-shrink: 0;
}

/* theme toggle icons: show one depending on theme */
#themeToggleApp .icon-sun  { display: none; }
#themeToggleApp .icon-moon { display: block; }
:root[data-theme="dark"] #themeToggleApp .icon-sun  { display: block; }
:root[data-theme="dark"] #themeToggleApp .icon-moon { display: none; }

/* ---------------------------------------------------------------- shell */

.app-shell {
  display: flex;
  padding-top: var(--topnav-h);
  min-height: 100vh;
}

/* ---------------------------------------------------------------- side nav */

.sidenav {
  position: fixed;
  top: var(--topnav-h);
  bottom: 0;
  left: 0;
  width: var(--sidenav-w);
  background: var(--surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  padding: 14px 10px;
  gap: 4px;
  z-index: 50;
  transition: transform var(--transition-med);
}

.sidenav-item {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 5px;
  padding: 11px 6px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 600;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.sidenav-item span:first-of-type { line-height: 1; }
.sidenav-item:hover { background: var(--accent-soft); color: var(--text); }
.sidenav-item.active {
  background: var(--accent-soft);
  color: var(--accent-deep);
}
.sidenav-item.active::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 50%;
  transform: translateY(-50%);
  width: 3px;
  height: 60%;
  background: var(--accent);
  border-radius: 0 3px 3px 0;
}

.nav-badge {
  position: absolute;
  top: 7px;
  right: 14px;
  min-width: 17px;
  height: 17px;
  padding: 0 5px;
  border-radius: 999px;
  background: var(--amber);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  display: grid;
  place-items: center;
  line-height: 1;
}
.nav-badge.hidden { display: none; }

.sidenav-footer {
  margin-top: auto;
  display: flex;
  justify-content: center;
  padding-bottom: 6px;
}

.model-info {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-muted);
  text-align: center;
  line-height: 1.4;
  word-break: break-all;
  max-width: 100%;
  padding: 6px;
  border-radius: 8px;
  background: var(--bg);
}

/* ---------------------------------------------------------------- workspace */

.workspace {
  flex: 1;
  margin-left: var(--sidenav-w);
  min-width: 0;
  padding: 28px 32px 48px;
}

.view { animation: fadeIn 0.3s ease; }
.view.hidden { display: none; }

.view-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}
.view-title {
  margin: 0;
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.03em;
}
.view-sub { margin: 4px 0 0; color: var(--text-muted); font-size: 14px; }

/* ---------------------------------------------------------------- panels */

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 22px;
  box-shadow: var(--shadow-sm);
}
.panel h2 {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.panel .sub { margin: 0 0 18px; color: var(--text-muted); font-size: 13px; }
.panel-muted { background: var(--bg-alt); }

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 16px;
}
.panel-head h2 { margin: 0; }

.toolbar {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.toolbar .spacer, .spacer { flex: 1; }

.muted { color: var(--text-muted); font-size: 13.5px; }
.muted.sm, .sm { font-size: 12.5px; }

.status { color: var(--text-muted); font-size: 13px; }
.status.err { color: var(--rose); font-weight: 500; }
.status.ok { color: var(--green); font-weight: 600; }

.badge {
  display: inline-grid;
  place-items: center;
  min-width: 19px;
  height: 19px;
  padding: 0 6px;
  border-radius: 999px;
  background: var(--border);
  color: var(--text-muted);
  font-size: 10.5px;
  font-weight: 700;
  line-height: 1;
  vertical-align: middle;
}
.badge:empty { display: none; }
.badge-warn { background: var(--amber-soft); color: var(--amber); }

/* ---------------------------------------------------------------- dashboard */

.dash-hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  background: var(--grad-hero);
  border-radius: var(--radius-xl);
  padding: 34px 38px;
  margin-bottom: 24px;
  overflow: hidden;
  min-height: 200px;
}

.dash-hero-content { position: relative; z-index: 1; max-width: 540px; }

.dash-greeting {
  margin: 0 0 6px;
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--on-accent);
  opacity: 0.75;
}
.dash-title {
  margin: 0 0 8px;
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--on-accent);
}
.dash-sub {
  margin: 0 0 20px;
  font-size: 14.5px;
  color: var(--on-accent);
  opacity: 0.8;
}
.dash-hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.dash-hero-actions .btn-primary { background: var(--on-accent); color: var(--accent); box-shadow: none; }
.dash-hero-actions .btn-primary:hover { opacity: 0.9; background: var(--on-accent); }
.dash-hero-actions .btn-ghost {
  background: rgba(255,255,255,0.25);
  border-color: rgba(255,255,255,0.4);
  color: var(--on-accent);
}
.dash-hero-actions .btn-ghost:hover { background: rgba(255,255,255,0.4); }

.dash-hero-art {
  flex-shrink: 0;
  width: 250px;
  animation: float 5s ease-in-out infinite;
}
.hero-illustration { width: 100%; height: auto; display: block; }

.dash-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 20px;
  align-items: start;
}
.dash-col { display: flex; flex-direction: column; gap: 20px; min-width: 0; }

/* active decks */
.dash-decks { display: flex; flex-direction: column; gap: 10px; }

.dash-deck {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-elevated);
  cursor: pointer;
  transition: border var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}
.dash-deck:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.dash-deck-icon {
  width: 40px; height: 40px;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  display: grid;
  place-items: center;
  font-size: 17px;
  flex-shrink: 0;
}
.dash-deck-info { flex: 1; min-width: 0; }
.dash-deck-name {
  font-weight: 600;
  font-size: 14.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.dash-deck-meta { font-size: 12.5px; color: var(--text-muted); }
.dash-deck-due {
  font-size: 12px;
  font-weight: 700;
  color: var(--amber);
  background: var(--amber-soft);
  padding: 4px 10px;
  border-radius: 999px;
  white-space: nowrap;
}
.dash-deck-due.zero { color: var(--text-muted); background: var(--border); }

.dash-empty-illust {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 28px 16px;
  color: var(--text-muted);
  text-align: center;
  font-size: 13.5px;
}
.dash-empty-illust svg { opacity: 0.6; }

/* quick actions */
.dash-actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}
.dash-action {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 16px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-elevated);
  color: var(--text);
  font-family: var(--font);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  text-align: center;
  transition: border var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}
.dash-action:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}
.dash-action-icon {
  width: 42px; height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
}

/* daily goal ring */
.goal-ring-wrap {
  position: relative;
  width: 140px;
  height: 140px;
  margin: 6px auto 12px;
}
.goal-ring { width: 100%; height: 100%; }
.goal-ring circle { transition: stroke-dashoffset 0.7s ease; }
.goal-ring-label {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  line-height: 1.1;
}
.goal-num { font-size: 30px; font-weight: 700; letter-spacing: -0.03em; }
.goal-of { font-size: 12px; color: var(--text-muted); }
.goal-caption {
  margin: 0;
  text-align: center;
  font-size: 12.5px;
  color: var(--text-muted);
}

/* upcoming */
.upcoming-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.upcoming-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--bg-alt);
  font-size: 13px;
}
.upcoming-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent);
  flex-shrink: 0;
}
.upcoming-item strong { font-weight: 600; }
.upcoming-item .when { margin-left: auto; color: var(--text-muted); font-size: 12px; white-space: nowrap; }
.upcoming-empty { color: var(--text-muted); font-size: 13px; padding: 8px 0; }

/* mini stats */
.dash-stats-mini {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  padding: 16px;
  text-align: center;
}
.mini-stat { display: flex; flex-direction: column; gap: 2px; }
.mini-stat-val { font-size: 22px; font-weight: 700; letter-spacing: -0.03em; color: var(--accent-deep); }
.mini-stat-label { font-size: 11px; color: var(--text-muted); }

/* ---------------------------------------------------------------- study */

.study-layout {
  display: flex;
  gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  min-height: calc(100vh - var(--topnav-h) - 56px);
}

/* deck sidebar (inside study view) */
.sidebar {
  width: 230px;
  flex-shrink: 0;
  background: var(--bg-alt);
  border-right: 1px solid var(--border);
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow-y: auto;
}

.new-deck {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  padding: 10px;
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius);
  background: transparent;
  color: var(--text);
  font-family: var(--font);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  transition: border var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}
.new-deck:hover { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-deep); }

.deck-header {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  padding: 10px 6px 4px;
}

.deck-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 3px;
}

.deck-item {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 11px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: background var(--transition-fast), color var(--transition-fast);
  border: 1px solid transparent;
}
.deck-item:hover { background: var(--surface); color: var(--text); }
.deck-item.active {
  background: var(--surface-elevated);
  border-color: var(--accent);
  color: var(--text);
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}
.deck-item-name {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.deck-item-count {
  font-size: 11px;
  font-weight: 700;
  color: var(--text-muted);
  background: var(--border);
  padding: 2px 7px;
  border-radius: 999px;
  min-width: 22px;
  text-align: center;
}
.deck-item.active .deck-item-count { background: var(--accent-soft); color: var(--accent-deep); }

/* study main column */
.study-main {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.study-topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 22px;
  border-bottom: 1px solid var(--border);
  background: var(--surface);
  flex-wrap: wrap;
}

.study-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
  flex-wrap: wrap;
}
.deck-title {
  font-weight: 700;
  font-size: 14.5px;
  letter-spacing: -0.01em;
  max-width: 240px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* tabs */
.tabs {
  display: flex;
  gap: 4px;
  background: var(--bg-alt);
  padding: 4px;
  border-radius: var(--radius);
}
.tabs button {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 16px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 13.5px;
  font-weight: 600;
  border-radius: 9px;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}
.tabs button:hover { color: var(--text); }
.tabs button.active {
  background: var(--surface-elevated);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}

.study-content {
  padding: 22px;
  overflow-y: auto;
  flex: 1;
}
.tab.hidden { display: none; }

/* generate form */
.gen-row {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 14px 0;
  flex-wrap: wrap;
}
.chk {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}
.chk input { accent-color: var(--accent-deep); width: 15px; height: 15px; }

.file-link {
  color: var(--accent-deep);
  font-weight: 600;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

.drop-zone {
  border: 2px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 30px 20px;
  text-align: center;
  position: relative;
  transition: border var(--transition-fast), background var(--transition-fast);
  cursor: pointer;
}
.drop-zone:hover, .drop-zone.drag { border-color: var(--accent); background: var(--accent-soft); }
.drop-zone input[type="file"] {
  position: absolute;
  inset: 0;
  opacity: 0;
  cursor: pointer;
}
.drop-icon { color: var(--text-muted); margin-bottom: 8px; }
.drop-text { margin: 0 0 4px; font-size: 14px; color: var(--text-secondary); }
.drop-hint { margin: 0; font-size: 12px; color: var(--text-muted); }

.file-preview { margin-top: 12px; }
.file-info {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 10px 14px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 13.5px;
}
.file-info span:first-of-type { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-size { color: var(--text-muted); font-size: 12px; flex-shrink: 0; }
.file-info .icon-btn { margin-left: auto; flex-shrink: 0; }
.file-preview.hidden { display: none; }

textarea, .search-input, .opt-label input, .opt-label select, input[type="text"], input[type="number"] {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg-alt);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  transition: border var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast);
}
textarea { resize: vertical; line-height: 1.6; min-height: 160px; }
textarea::placeholder { color: var(--text-muted); }
textarea:focus, .search-input:focus, input:focus, select:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface-elevated);
  box-shadow: var(--shadow-glow);
}

.search-input { max-width: 300px; }

.gen-options {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  margin-top: 16px;
  flex-wrap: wrap;
}
.opt-label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  min-width: 90px;
}
.opt-label input, .opt-label select { min-width: 90px; }
.opt-label:has(#tags) { flex: 1; min-width: 160px; }
.opt-label:has(#modelSelect) { min-width: 150px; }
.gen-options .btn-primary { height: 42px; }

select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23685D55' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 34px;
  cursor: pointer;
}

.progress { margin-top: 16px; }
.progress-bar {
  height: 7px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
  position: relative;
}
.progress-fill {
  height: 100%;
  width: 40%;
  background: var(--grad);
  border-radius: 999px;
  animation: progressSlide 1.2s ease-in-out infinite;
}
.progress.hidden { display: none; }

.tips-list {
  margin: 8px 0 0;
  padding-left: 18px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.55;
}
.tips-list strong { color: var(--text); }

/* ---------------------------------------------------------------- review */

.review-card-wrap {
  perspective: 1200px;
  margin: 6px 0 20px;
}
.review-card {
  position: relative;
  min-height: 220px;
  cursor: pointer;
  transform-style: preserve-3d;
  transition: transform 0.5s cubic-bezier(.4,.2,.2,1);
}
.review-card.flipped { transform: rotateY(180deg); }
.review-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: var(--surface-elevated);
  gap: 12px;
}
.review-face.back { transform: rotateY(180deg); background: var(--bg-alt); }
.review-label {
  font-size: 10.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-deep);
}
.review-face.back .review-label { color: var(--secondary); }
.review-text { font-size: 19px; font-weight: 600; line-height: 1.5; }
.review-face.back .review-text { font-size: 16.5px; font-weight: 500; }
.review-hint { font-size: 12px; color: var(--text-muted); margin-top: 6px; }
.review-source {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  opacity: 0.7;
}

.rating-row {
  display: flex;
  gap: 10px;
  justify-content: center;
  flex-wrap: wrap;
}
.rating-btn {
  min-width: 105px;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-elevated);
  color: var(--text);
  font-family: var(--font);
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  transition: border var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}
.rating-btn .ivl { font-size: 11px; font-weight: 500; color: var(--text-muted); }
.rating-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow); }
.rating-btn.again:hover { border-color: var(--rose); background: var(--rose-soft); }
.rating-btn.hard:hover  { border-color: var(--amber); background: var(--amber-soft); }
.rating-btn.good:hover  { border-color: var(--accent); background: var(--accent-soft); }
.rating-btn.easy:hover  { border-color: var(--green); background: var(--green-soft); }

.review-done {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 40px 16px;
  text-align: center;
}
.review-done .done-icon {
  width: 72px; height: 72px;
  border-radius: 50%;
  background: var(--green-soft);
  color: var(--green);
  display: grid;
  place-items: center;
  animation: scaleIn 0.4s ease;
}

/* pomodoro chip inside review */
.pomodoro-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 999px;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
}
.pomodoro-chip.running { border-color: var(--accent); background: var(--accent-soft); color: var(--accent-deep); }
.pomo-btn {
  border: none;
  background: transparent;
  color: inherit;
  font-family: var(--font);
  font-size: 11px;
  font-weight: 700;
  cursor: pointer;
  padding: 2px 6px;
  border-radius: 6px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.pomo-btn:hover { background: var(--border); }

/* ---------------------------------------------------------------- quiz */

.quiz-q {
  font-size: 17px;
  font-weight: 600;
  line-height: 1.55;
  margin: 0 0 18px;
}
.quiz-opts { display: flex; flex-direction: column; gap: 9px; }
.quiz-opt {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  padding: 13px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface-elevated);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  text-align: left;
  cursor: pointer;
  transition: border var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}
.quiz-opt:hover:not(:disabled) { border-color: var(--accent); transform: translateX(3px); }
.quiz-opt:disabled { cursor: default; }
.quiz-opt .opt-key {
  flex-shrink: 0;
  width: 24px; height: 24px;
  border-radius: 7px;
  background: var(--border);
  display: grid;
  place-items: center;
  font-size: 11.5px;
  font-weight: 700;
  color: var(--text-muted);
}
.quiz-opt.correct {
  border-color: var(--green);
  background: var(--green-soft);
}
.quiz-opt.correct .opt-key { background: var(--green); color: #fff; }
.quiz-opt.wrong {
  border-color: var(--rose);
  background: var(--rose-soft);
}
.quiz-opt.wrong .opt-key { background: var(--rose); color: #fff; }
.quiz-opt.shake { animation: shake 0.4s ease; }
.quiz-opt.locked { opacity: 0.55; cursor: default; }

.quiz-list {
  margin-top: 20px;
  border-top: 1px solid var(--border);
  padding-top: 14px;
}
.quiz-list-title {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.quiz-entry {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border-radius: var(--radius);
  font-size: 13px;
  cursor: pointer;
  transition: background var(--transition-fast);
  border: 1px solid transparent;
}
.quiz-entry:hover { background: var(--bg-alt); }
.quiz-entry.active {
  background: var(--accent-soft);
  border-color: var(--accent);
}
.quiz-entry .acc {
  font-size: 11px;
  font-weight: 700;
  font-family: var(--font-mono);
  padding: 2px 8px;
  border-radius: 999px;
  flex-shrink: 0;
}
.quiz-entry .acc-none { background: var(--border); color: var(--text-muted); }
.quiz-entry .acc-good { background: var(--green-soft); color: var(--green); }
.quiz-entry .acc-bad  { background: var(--rose-soft); color: var(--rose); }
.quiz-entry .del {
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
  padding: 3px 7px;
  border-radius: 6px;
  opacity: 0;
  transition: opacity var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
}
.quiz-entry:hover .del { opacity: 1; }
.quiz-entry .del:hover { color: var(--rose); background: var(--rose-soft); }

.quiz-explain {
  margin-top: 14px;
  padding: 13px 16px;
  background: var(--bg-alt);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 13.5px;
  color: var(--text-secondary);
  line-height: 1.55;
  animation: fadeIn 0.25s ease;
}
.quiz-explain strong { color: var(--text); }

.quiz-progress-row {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.quiz-progress-bar {
  flex: 1;
  height: 6px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.quiz-progress-fill {
  height: 100%;
  background: var(--grad);
  border-radius: 999px;
  transition: width 0.4s ease;
}
.quiz-score-pill {
  font-size: 12px;
  font-weight: 700;
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  white-space: nowrap;
}

.quiz-start {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 44px 20px;
  text-align: center;
}
.quiz-start-art { animation: float 4s ease-in-out infinite; }
.quiz-start h3 { margin: 0; font-size: 19px; font-weight: 700; }
.quiz-start p { margin: 0; color: var(--text-muted); font-size: 14px; max-width: 340px; }

.quiz-result {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
  padding: 40px 20px;
  text-align: center;
  animation: scaleIn 0.4s ease;
}
.quiz-result-score {
  font-size: 46px;
  font-weight: 700;
  letter-spacing: -0.04em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------------------------------------------------------------- library / cards */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(230px, 1fr));
  gap: 13px;
}

.qcard {
  position: relative;
  min-height: 165px;
  perspective: 1000px;
  cursor: pointer;
}
.qcard-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 165px;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(.4,.2,.2,1);
}
.qcard.flipped .qcard-inner { transform: rotateY(180deg); }
.qcard-face {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  background: var(--surface-elevated);
  display: flex;
  flex-direction: column;
  gap: 8px;
  overflow: hidden;
}
.qcard-face.back { transform: rotateY(180deg); background: var(--bg-alt); }
.qcard-type {
  font-size: 9.5px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-deep);
}
.qcard-face.back .qcard-type { color: var(--secondary); }
.qcard-f {
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.5;
  flex: 1;
  overflow: hidden;
}
.qcard-face.back .qcard-f { font-weight: 500; font-size: 13px; }
.qcard-tags {
  display: flex;
  gap: 5px;
  flex-wrap: wrap;
}
.qcard-tag {
  font-size: 10px;
  font-weight: 600;
  padding: 2px 7px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
}
.qcard-srs {
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-muted);
  display: flex;
  justify-content: space-between;
}
.qcard-wrong { border-color: var(--rose); }
.qcard-x {
  position: absolute;
  top: 8px; right: 8px;
  width: 24px; height: 24px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  display: grid;
  place-items: center;
  opacity: 0;
  transition: opacity var(--transition-fast), background var(--transition-fast), color var(--transition-fast);
}
.qcard:hover .qcard-x { opacity: 1; }
.qcard-x:hover { background: var(--rose-soft); color: var(--rose); }
.qcard-x:focus-visible { opacity: 1; }

.empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 44px 20px;
  text-align: center;
  color: var(--text-muted);
  font-size: 14px;
}
.empty-icon {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--bg-alt);
  display: grid;
  place-items: center;
  color: var(--text-muted);
  margin-bottom: 4px;
}
.empty-title { font-size: 16px; font-weight: 700; color: var(--text); }
.empty.hidden { display: none; }

/* ---------------------------------------------------------------- analytics / stats */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
}
.stat-tile {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.stat-tile .val {
  font-size: 27px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--accent-deep);
}
.stat-tile .lbl {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.srs-bars { margin-top: 20px; display: flex; flex-direction: column; gap: 10px; }
.srs-bar-row { display: flex; align-items: center; gap: 12px; font-size: 13px; }
.srs-bar-label { width: 80px; color: var(--text-muted); font-weight: 600; flex-shrink: 0; }
.srs-bar-track {
  flex: 1;
  height: 9px;
  background: var(--border);
  border-radius: 999px;
  overflow: hidden;
}
.srs-bar-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--grad);
  transition: width 0.6s ease;
}
.srs-bar-row:nth-child(1) .srs-bar-fill { background: var(--rose); }
.srs-bar-row:nth-child(2) .srs-bar-fill { background: var(--amber); }
.srs-bar-row:nth-child(3) .srs-bar-fill { background: var(--accent); }
.srs-bar-row:nth-child(4) .srs-bar-fill { background: var(--green); }
.srs-bar-count { width: 42px; text-align: right; font-weight: 700; font-family: var(--font-mono); font-size: 12px; }

/* ---------------------------------------------------------------- toasts / modal / backdrop */

.toasts {
  position: fixed;
  bottom: 22px;
  right: 22px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  z-index: 300;
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  padding: 13px 17px;
  font-size: 13.5px;
  font-weight: 500;
  max-width: 340px;
  display: flex;
  align-items: flex-start;
  gap: 10px;
  animation: slideInRight 0.3s ease;
}
.toast.err { border-left: 3px solid var(--rose); }
.toast.ok  { border-left: 3px solid var(--green); }
.toast.out { animation: tl-out 0.25s ease forwards; }
@keyframes tl-out { to { transform: translateX(10px); opacity: 0; } }

.mock-tag {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 6px;
  border-radius: 999px;
  background: var(--amber-soft);
  color: var(--amber);
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.06em;
  vertical-align: middle;
}

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(10, 16, 14, 0.55);
  backdrop-filter: blur(4px);
  display: grid;
  place-items: center;
  z-index: 200;
  animation: fadeIn 0.2s ease;
  padding: 20px;
}
.modal {
  background: var(--surface-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  max-width: 430px;
  padding: 26px;
  animation: scaleIn 0.25s ease;
}
.modal h2 { margin: 0 0 6px; font-size: 18px; font-weight: 700; letter-spacing: -0.02em; }
.modal .modal-sub { margin: 0 0 20px; color: var(--text-muted); font-size: 13.5px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 22px; }

.prefs-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  margin-bottom: 16px;
}
.prefs-row > label { font-size: 13.5px; font-weight: 600; }
.seg {
  display: flex;
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3px;
  gap: 2px;
}
.seg button {
  border: none;
  background: transparent;
  color: var(--text-muted);
  font-family: var(--font);
  font-size: 12.5px;
  font-weight: 600;
  padding: 7px 13px;
  border-radius: 9px;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.seg button.on { background: var(--surface-elevated); color: var(--text); box-shadow: var(--shadow-sm); }

.accents { display: flex; gap: 8px; }
.accents button {
  width: 26px; height: 26px;
  border-radius: 50%;
  border: 2px solid transparent;
  background: var(--sw);
  cursor: pointer;
  transition: transform var(--transition-fast), border var(--transition-fast);
}
.accents button:hover { transform: scale(1.15); }
.accents button.on { border-color: var(--text); transform: scale(1.1); }

.sidebar-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(10,16,14,.45);
  z-index: 45;
  display: none;
  animation: fadeIn 0.2s ease;
}
.sidebar-backdrop.on { display: block; }

/* sidenav opens only on mobile via .open */
@media (min-width: 901px) {
  .sidebar-backdrop { display: none !important; }
}

/* study mode: exit X over everything */
.focus-exit {
  position: fixed;
  top: 14px; right: 18px;
  z-index: 400;
  width: 42px; height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface-elevated);
  color: var(--text);
  cursor: pointer;
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-lg);
  transition: transform var(--transition-fast), background var(--transition-fast);
}
.focus-exit:hover { transform: scale(1.08); background: var(--rose-soft); color: var(--rose); }

/* focus / study mode body state */
body.focus-mode .app-topnav,
body.focus-mode .sidenav { display: none; }
body.focus-mode .app-shell { padding-top: 0; }
body.focus-mode .workspace { margin-left: 0; padding-top: 20px; }
body.focus-mode .sidebar { display: none; }

/* focused study card layout (review tab in focus mode) */
body.focus-mode .study-layout { border: none; box-shadow: none; min-height: auto; }
body.focus-mode .study-topbar { padding-left: 64px; }
body.focus-mode .study-content { max-width: 760px; margin: 0 auto; width: 100%; }

.card-progress-pills {
  display: flex;
  gap: 5px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 16px;
}
.card-pill {
  width: 26px; height: 6px;
  border-radius: 999px;
  background: var(--border);
  transition: background var(--transition-med);
}
.card-pill.done { background: var(--accent); }
.card-pill.current { background: var(--accent-deep); animation: pulse 1.4s ease infinite; }

/* ---------------------------------------------------------------- responsive */

@media (max-width: 1100px) {
  .dash-grid { grid-template-columns: 1fr; }
  .dash-hero-art { width: 190px; }
}

@media (max-width: 900px) {
  .menu-btn { display: grid; }
  .brand-name { display: none; }
  .topnav-search { max-width: none; }

  .sidenav {
    transform: translateX(-100%);
    width: 230px;
    box-shadow: var(--shadow-lg);
    padding: 16px 12px;
  }
  .sidenav.open { transform: translateX(0); }
  .sidenav-item {
    flex-direction: row;
    justify-content: flex-start;
    gap: 12px;
    padding: 13px 14px;
    font-size: 14px;
  }
  .nav-badge { position: static; margin-left: auto; }
  .sidenav-footer { align-items: flex-end; }

  .workspace { margin-left: 0; padding: 20px 16px 40px; }

  .dash-hero { flex-direction: column; text-align: center; padding: 28px 22px; }
  .dash-hero-content { display: flex; flex-direction: column; align-items: center; }
  .dash-hero-art { width: 170px; order: -1; }
  .dash-actions { grid-template-columns: repeat(2, 1fr); }

  .study-layout { flex-direction: column; min-height: auto; }
  .sidebar {
    width: 100%;
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 210px;
  }
  .study-topbar { padding: 12px 16px; }
  .study-content { padding: 16px; }
  .deck-title { max-width: 130px; }
  .gen-options { flex-direction: column; align-items: stretch; }
  .gen-options .btn-primary { width: 100%; }
}

@media (max-width: 640px) {
  .topnav-search { display: none; }
  .streak-badge span:not(#streakCount) { display: none; }
  .streak-badge { padding: 0 9px; }
  #streakCount + * { display: none; }

  .dash-title { font-size: 24px; }
  .dash-stats-mini { grid-template-columns: repeat(3, 1fr); padding: 12px; }
  .mini-stat-val { font-size: 18px; }
  .view-title { font-size: 22px; }

  .tabs { width: 100%; }
  .tabs button { flex: 1; justify-content: center; padding: 8px 8px; font-size: 12.5px; }
  .study-actions { width: 100%; margin-left: 0; }
  .deck-title { max-width: none; flex: 1; }

  .rating-btn { min-width: 0; flex: 1 1 45%; }
  .card-grid { grid-template-columns: 1fr; }
  .toasts { left: 16px; right: 16px; bottom: 16px; }
  .toast { max-width: none; }
}

/* ------------------------------------------------------- loading states */

.boot-screen {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  background: var(--bg);
  transition: opacity 0.25s ease;
}
.boot-screen.out { opacity: 0; pointer-events: none; }
.boot-screen p { color: var(--text-muted); font-size: 14px; }

.boot-spinner,
.spin-inline {
  border-radius: 50%;
  border: 3px solid var(--border);
  border-top-color: var(--accent-deep);
  animation: fq-spin 0.8s linear infinite;
}
.boot-spinner { width: 36px; height: 36px; }
.spin-inline {
  display: inline-block;
  width: 13px;
  height: 13px;
  vertical-align: -2px;
  border-width: 2px;
  margin-right: 6px;
}
@keyframes fq-spin { to { transform: rotate(360deg); } }

button.busy, a.busy { cursor: progress; opacity: 0.75; pointer-events: none; }
.modal-actions button:disabled { opacity: 0.6; cursor: progress; }