body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background: #ffe0ec;
  margin: 0;
  min-height: 100vh;
  transition: background .28s, color .18s;
}
body.dark {
  background: #282432;
  color: #eee;
}

#page-container {
  display: flex;
  align-items: flex-start;
  min-height: 100vh;
  width: 100vw;
  justify-content: center;
}

#main-content {
  flex: 1 1 0;
  max-width: 1400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

/* Wider "my decks" and app card area */
#my-decks-area {
  width: 740px;
  max-width: 97vw;
  margin: 36px auto 22px auto;
  background: #fff4fa;
  border-radius: 22px;
  box-shadow: 0 2px 18px #fab3ce22;
  padding: 22px 20px 12px 20px;
  text-align: center;
}

#user-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
  min-height: 44px;
  justify-content: center;
  margin-bottom: 6px;
}

/* My Decks Card Styles */
.user-deck {
  background: #fff;
  border: 2.5px solid #ffd6e6;
  border-radius: 20px;
  min-width: 250px;
  max-width: 320px;
  box-shadow: 0 2px 8px #fab3ce66;
  padding: 20px 18px 18px 18px;
  color: #d72660;
  font-size: 1.07rem;
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 7px;
  position: relative;
  cursor: pointer;
  transition: background .13s, border .13s, box-shadow .15s;
  margin-bottom: 0;
}
.user-deck.selected {
  background: #ffe0ec;
  border: 2.5px solid #d72660;
  box-shadow: 0 8px 24px #d7266035;
}
.user-deck-title {
  font-weight: bold;
  font-size: 1.18em;
  margin-bottom: 2px;
}
.user-deck-tag {
  font-size: 1.01em;
  color: #ba79ad;
  margin-bottom: 2px;
}
.user-deck-count {
  font-size: .99em;
  color: #b883a6;
}
.user-deck-delete {
  position: absolute;
  top: 10px;
  right: 14px;
  color: #d72660;
  background: none;
  border: none;
  font-size: 1.16em;
  cursor: pointer;
  opacity: 0.65;
  padding: 0;
  z-index: 2;
  transition: color .15s;
}
.user-deck-delete:hover {
  color: #c71046;
  opacity: 1;
}
.user-deck-dup, .user-deck-merge {
  position: absolute;
  bottom: 10px;
  right: 14px;
  background: #ffb6d5;
  color: #fff;
  border: none;
  border-radius: 7px;
  font-size: 1em;
  font-weight: 500;
  padding: 3px 13px;
  cursor: pointer;
  opacity: 0.87;
  margin-left: 3px;
  transition: background .13s;
}
.user-deck-dup:hover, .user-deck-merge:hover {
  background: #d72660;
  opacity: 1;
}
.user-deck-merge {
  right: 102px;
}

/* App Card */
#app {
  width: 900px;
  max-width: 99vw;
  margin: 44px auto 0 auto;
  padding: 48px 44px 40px 44px;
  background: #fff4fa;
  border-radius: 28px;
  box-shadow: 0 8px 32px rgba(220, 72, 140, 0.12);
  text-align: center;
  transition: background .3s;
}
body.dark #app {
  background: #221a29;
  color: #eee;
}

#theme-area {
  width: 100%;
  max-width: 1020px;
  margin: 24px auto 6px auto;
  background: #fff4fa;
  border-radius: 18px;
  box-shadow: 0 3px 18px #fab3ce33;
  text-align: center;
  font-size: 1.11em;
  padding: 14px 32px 8px 32px;
  color: #b14579;
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 54px;
}
body.dark #theme-area { background: #221a29; color: #fbc7e3; }

.theme-row {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
}

.theme-label {
  font-weight: 600;
  font-size: 1.04em;
  margin-right: 5px;
}

/* Cute toggle switch */
.switch {
  position: relative;
  display: inline-block;
  width: 40px;
  height: 22px;
  margin-right: 2px;
}
.switch input {
  opacity: 0;
  width: 0;
  height: 0;
}
.slider {
  position: absolute;
  cursor: pointer;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: #ffd6e6;
  border-radius: 22px;
  transition: .4s;
}
.slider:before {
  position: absolute;
  content: "";
  height: 16px; width: 16px;
  left: 3px; bottom: 3px;
  background-color: #fff;
  border-radius: 50%;
  transition: .4s;
  box-shadow: 0 1px 3px #d7266022;
}
.switch input:checked + .slider {
  background-color: #b883a6;
}
.switch input:checked + .slider:before {
  transform: translateX(18px);
}
.slider:active:before {
  width: 20px;
}
#card-color-select, #font-select {
  padding: 4px 14px;
  border-radius: 9px;
  border: 1.5px solid #fab3ce;
  background: #fff4fa;
  color: #b14579;
  font-size: 1em;
  font-weight: 500;
  margin-left: 2px;
  transition: border .13s;
}
body.dark #card-color-select, body.dark #font-select {
  background: #352b40;
  color: #ffc2da;
  border-color: #ba79ad;
}

h1 {
  color: #d72660;
  font-weight: 700;
  margin-bottom: 22px;
  letter-spacing: 1px;
  font-size: 2.2rem;
}
#badge-area {
  margin-bottom: 14px;
}
form {
  display: flex;
  gap: 10px;
  margin-bottom: 15px;
  flex-direction: column;
  align-items: center;
}
#deck-form {
  margin-bottom: 14px;
  flex-direction: row;
  gap: 8px;
  justify-content: center;
}
#deck-title-input {
  padding: 12px;
  width: 180px;
  border: 1.5px solid #fab3ce;
  border-radius: 8px;
  margin-right: 2px;
  background: #fff;
  font-size: 1.04rem;
}
body.dark #deck-title-input { background: #352b40; color: #fff; border-color: #ba79ad; }
#deck-tag-input {
  padding: 11px 10px;
  border: 1.5px solid #fab3ce;
  border-radius: 8px;
  background: #fff;
  font-size: 1.01rem;
  margin-right: 2px;
}
body.dark #deck-tag-input { background: #352b40; color: #fff; border-color: #ba79ad; }
#current-deck-title {
  color: #d72660;
  font-size: 1.18em;
  font-weight: bold;
  margin-bottom: 6px;
  min-height: 1.8em;
  letter-spacing: .3px;
}
body.dark #current-deck-title { color: #ffc2da; }
input[type="text"]:not(#deck-title-input) {
  padding: 12px;
  width: 96%;
  border: 1.5px solid #fab3ce;
  border-radius: 8px;
  margin-bottom: 6px;
  background: #fff;
  font-size: 1.08rem;
}
body.dark input[type="text"]:not(#deck-title-input) { background: #352b40; color: #fff; border-color: #ba79ad; }
button {
  padding: 12px 30px;
  background: #ff8aba;
  color: #fff;
  border: none;
  border-radius: 9px;
  font-weight: 500;
  font-size: 1.08rem;
  margin: 0 4px;
  cursor: pointer;
  box-shadow: 0 1px 3px #ecc2d4;
  transition: background 0.15s, box-shadow 0.12s;
}
button:hover {
  background: #d72660;
  box-shadow: 0 2px 6px #d7266025;
}
.controls-row {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 18px;
}
#flashcard-controls {
  gap: 8px;
  margin-bottom: 6px;
}
#flashcard-container {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 60vh;
  margin-bottom: 2px;
}
#card, .quiz-card {
  background: var(--card-color, #fff);
  color: #d72660;
  font-size: 2.1rem;
  font-weight: 600;
  padding: 52px 44px;
  min-width: 370px;
  min-height: 230px;
  max-width: 88vw;
  max-height: 62vh;
  border: 2.5px solid #fab3ce;
  border-radius: 22px;
  box-shadow: 0 6px 28px #fab3ce44;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  transition: box-shadow 0.18s, background .22s;
}
#card:hover, .quiz-card:hover {
  box-shadow: 0 12px 32px #d7266055;
}
body.dark #card, body.dark .quiz-card {
  border-color: #ba79ad;
  color: #ffc2da;
}
.quiz-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
}
.quiz-q {
  width: 100%;
  word-break: break-word;
  text-align: center;
  font-size: 1.22em;
  font-weight: 600;
  color: #d72660;
  margin-bottom: 16px;
}
body.dark .quiz-q { color: #ffc2da; }
.quiz-a {
  width: 100%;
  word-break: break-word;
  text-align: center;
  margin-bottom: 24px;
  font-size: 1.12em;
  color: #222;
}
body.dark .quiz-a { color: #ffc2da; }
.quiz-btn-row {
  width: 100%;
  display: flex;
  justify-content: center;
  gap: 18px;
  margin-bottom: 8px;
}
.quiz-flag {
  font-size: 1.06em;
  color: #b14579;
  margin-top: 12px;
}
body.dark .quiz-flag { color: #ffc2da; }
.quiz-mistake {
  color: #d72660;
  font-weight: bold;
  font-size: 1em;
  margin-top: 6px;
}
.quiz-summary {
  margin-top: 14px;
  font-size: 1.13em;
  color: #444;
}
body.dark .quiz-summary { color: #ffc2da; }

.badge {
  display: inline-block;
  background: #ffe0ec;
  color: #d72660;
  border: 2px solid #d72660;
  border-radius: 14px;
  padding: 4px 13px 4px 10px;
  font-size: 1.04em;
  font-weight: 500;
  margin-right: 8px;
  margin-bottom: 3px;
  box-shadow: 0 1px 4px #fab3ce44;
  vertical-align: middle;
  line-height: 1.6em;
}
body.dark .badge {
  background: #221a29;
  color: #ffc2da;
  border-color: #ffc2da;
}

#trending-sidebar {
  width: 380px;
  min-width: 260px;
  background: #fff4fa;
  border-radius: 26px;
  margin: 48px 50px 0 28px;
  box-shadow: 0 2px 18px #fab3ce33;
  padding: 28px 20px 44px 24px;
  position: sticky;
  top: 28px;
  height: fit-content;
  max-height: 92vh;
  overflow-y: auto;
  z-index: 2;
}
body.dark #trending-sidebar { background: #221a29; }
#trending-sidebar .trending-title {
  text-align: left;
  margin-top: 0;
  font-size: 1.2em;
  color: #d72660;
}
#trending-decks {
  display: flex;
  flex-direction: column;
  gap: 21px;
  margin-top: 5px;
  max-height: 80vh;
  overflow-y: auto;
}
.trending-deck {
  background: #fff;
  border: 2.5px solid #ffd6e6;
  border-radius: 19px;
  min-width: 160px;
  max-width: 320px;
  box-shadow: 0 2px 8px #fab3ce66;
  padding: 22px 16px 16px 16px;
  color: #d72660;
  font-size: 1.12rem;
  flex: 0 0 auto;
  transition: transform .13s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 10px;
}
.trending-deck:hover {
  transform: translateY(-6px) scale(1.045);
  box-shadow: 0 8px 24px #d7266055;
}
.trending-deck-title {
  font-weight: bold;
  font-size: 1.18em;
  margin-bottom: 2px;
}
.trending-deck-author {
  font-size: 1.01em;
  color: #b14579;
  margin-bottom: 6px;
}
.trending-deck-count {
  font-size: .99em;
  color: #b883a6;
  margin-bottom: 6px;
}
.trending-add-btn {
  margin-top: 6px;
  background: #ffb6d5;
  color: #fff;
  font-size: 1.02em;
  padding: 9px 26px;
  border-radius: 9px;
  border: none;
  font-weight: 500;
  transition: background .13s;
}
.trending-add-btn:hover {
  background: #d72660;
}
.flashcard-move-btn {
  background: #ffe0ec;
  color: #b14579;
  border: none;
  border-radius: 7px;
  font-size: 1.15em;
  margin: 0 2px;
  padding: 2px 11px;
  cursor: pointer;
  transition: background .13s;
  vertical-align: middle;
}
.flashcard-move-btn:hover {
  background: #d72660;
  color: #fff;
}
body.dark .flashcard-move-btn { background: #352b40; color: #ffc2da; }
body.dark .flashcard-move-btn:hover { background: #ffc2da; color: #b14579; }

.modal {
  display: block;
  position: fixed;
  z-index: 9999;
  left: 0; top: 0;
  width: 100vw; height: 100vh;
  overflow: auto;
  background: rgba(60, 40, 90, 0.30);
}
.modal-content {
  background: #fff4fa;
  margin: 64px auto;
  padding: 28px 22px 18px 22px;
  border-radius: 18px;
  box-shadow: 0 7px 36px #d7266011;
  width: 90vw; max-width: 420px;
  min-height: 160px;
  position: relative;
  text-align: center;
  font-size: 1.1em;
}
body.dark .modal-content { background: #221a29; color: #ffc2da; }
.close {
  position: absolute;
  top: 13px; right: 16px;
  color: #d72660;
  font-size: 2em;
  font-weight: 700;
  cursor: pointer;
  transition: color .16s;
}
.close:hover { color: #c71046; }

@media (max-width: 1600px) {
  #main-content { max-width: 99vw; }
  #my-decks-area, #app { width: 98vw; }
  #trending-sidebar { margin-right: 18px; }
}
@media (max-width: 1200px) {
  #my-decks-area, #app, #trending-sidebar { width: 99vw; padding-left: 2vw; padding-right: 2vw; }
  #main-content { max-width: 99vw; }
  #trending-sidebar { margin: 22px auto 0 auto; }
  #page-container { flex-direction: column; align-items: center; }
}
@media (max-width: 900px) {
  #my-decks-area, #app, #trending-sidebar { width: 99vw !important; padding: 10px 1vw !important; }
  .user-deck, .trending-deck { min-width: 94vw; max-width: 99vw; }
  .modal-content { max-width: 99vw; }
}
.memory-board {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(100px,1fr));
  gap: 12px;
  max-width: 600px;
  margin: 20px auto;
}
.memory-card {
  background: #ffe0ec;
  border: 2px solid #fab3ce;
  border-radius: 12px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  user-select: none;
  transition: background .16s, color .16s;
}
.memory-card.flipped {
  background: #fff4fa;
}
.memory-card.matched {
  background: #d72660;
  color: #fff;
  border-color: #d72660;
  cursor: default;
}
#memory-timer {
  font-family: 'Segoe UI', Arial, sans-serif;
  letter-spacing: 0.5px;
}

.hidden {visibility: hidden;}