:root {
  color-scheme: light;
  --page-text: #10151c;
  --page-muted: #364252;
  --surface: rgba(255, 255, 255, 0.94);
  --card-text: #fff;
  --card-muted: rgba(255, 255, 255, 0.88);
  --accent: #5c2ecb;
  --accent-dark: #4720a5;
  --focus: #6c38df;
  --shadow-control: 0 3px 13px rgba(14, 31, 50, 0.15);
  --shadow-card: 0 8px 24px rgba(8, 22, 38, 0.25);
  --content-width: 1480px;
  --font: "Segoe UI", "Aptos", Arial, sans-serif;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html {
  min-height: 100%;
  background: #d9e5f1;
  scroll-behavior: smooth;
}

body {
  min-width: 320px;
  min-height: 100vh;
  margin: 0;
  color: var(--page-text);
  font-family: var(--font);
  background-color: #d9e5f1;
  background-image: url("../assets/cloud-mountains.png");
  background-repeat: no-repeat;
  background-position: 50% 14%;
  background-size: cover;
  background-attachment: fixed;
}

button, input { font: inherit; }
button { cursor: pointer; }

.library-shell {
  width: min(100%, var(--content-width));
  margin: 0 auto;
  padding: 50px 62px 88px;
}

.library-header h1 {
  margin: 0;
  font-size: clamp(3.45rem, 5.1vw, 5.25rem);
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.055em;
}

.library-header p {
  margin: 20px 0 0;
  color: var(--page-muted);
  font-size: clamp(1.05rem, 1.35vw, 1.28rem);
  line-height: 1.45;
}

.library-controls { margin-top: 24px; }

.search-control {
  display: flex;
  width: min(100%, 850px);
  height: 58px;
  align-items: center;
  gap: 15px;
  padding: 0 18px;
  border: 1px solid rgba(63, 75, 93, 0.27);
  border-radius: 7px;
  background: var(--surface);
  box-shadow: var(--shadow-control);
  backdrop-filter: blur(12px);
}

.search-control:focus-within {
  border-color: var(--focus);
  box-shadow: 0 0 0 3px rgba(108, 56, 223, 0.18), var(--shadow-control);
}

.search-control svg {
  width: 25px;
  height: 25px;
  flex: 0 0 auto;
  fill: none;
  stroke: #344152;
  stroke-width: 1.75;
  stroke-linecap: round;
}

.search-control input {
  width: 100%;
  min-width: 0;
  border: 0;
  outline: 0;
  color: var(--page-text);
  background: transparent;
  font-size: 1.08rem;
}

.search-control input::placeholder { color: #707988; opacity: 1; }

.browse-row {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 28px;
  margin-top: 25px;
  border-bottom: 1px solid rgba(38, 51, 67, 0.22);
}

.task-navigation {
  display: flex;
  min-width: 0;
  overflow-x: auto;
  gap: clamp(17px, 1.75vw, 27px);
  scrollbar-width: none;
}

.task-navigation::-webkit-scrollbar { display: none; }

.task-button {
  position: relative;
  flex: 0 0 auto;
  padding: 0 1px 13px;
  border: 0;
  color: #1d2733;
  background: transparent;
  font-size: clamp(0.86rem, 0.9vw, 0.98rem);
  font-weight: 500;
  white-space: nowrap;
}

.task-button::after {
  position: absolute;
  right: 0;
  bottom: -1px;
  left: 0;
  height: 3px;
  border-radius: 3px 3px 0 0;
  background: var(--accent);
  content: "";
  opacity: 0;
  transform: scaleX(0.45);
  transition: opacity 150ms ease, transform 150ms ease;
}

.task-button:hover { color: var(--accent-dark); }
.task-button.is-active { color: #111820; font-weight: 650; }
.task-button.is-active::after { opacity: 1; transform: scaleX(1); }

.results-count {
  flex: 0 0 auto;
  margin: 0 0 13px;
  color: #1e2732;
  font-size: 0.96rem;
  font-weight: 520;
  white-space: nowrap;
}

.prompt-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 22px;
  margin-top: 24px;
}

.prompt-card {
  position: relative;
  min-width: 0;
  min-height: 296px;
  border-radius: 7px;
  outline: none;
  perspective: 1300px;
}

.prompt-card:focus-visible { box-shadow: 0 0 0 4px rgba(108, 56, 223, 0.34); }

.card-inner {
  position: absolute;
  inset: 0;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: inherit;
  box-shadow: var(--shadow-card);
  transform-style: preserve-3d;
  transition: transform 430ms cubic-bezier(0.22, 0.74, 0.24, 1), box-shadow 170ms ease;
}

.prompt-card:hover .card-inner { box-shadow: 0 13px 34px rgba(8, 22, 38, 0.31); }
.prompt-card.is-open .card-inner { transform: rotateY(180deg); }
.prompt-card.is-featured:not(.is-open) .card-inner { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent), var(--shadow-card); }

.card-face {
  position: absolute;
  inset: 0;
  isolation: isolate;
  display: flex;
  overflow: hidden;
  flex-direction: column;
  align-items: flex-start;
  padding: 30px 29px 27px;
  border-radius: inherit;
  color: var(--card-text);
  background: #0b1a2a;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.card-face::before,
.card-face::after {
  position: absolute;
  inset: 0;
  z-index: -2;
  content: "";
}

.card-face::before {
  background-image: url("../assets/cloud-mountains.png");
  background-repeat: no-repeat;
  background-position: var(--card-image-position, 52% 68%);
  background-size: 175%;
  filter: saturate(0.73) contrast(1.08);
  transform: scale(1.03);
}

.card-face::after {
  z-index: -1;
  background: linear-gradient(180deg, rgba(7, 22, 38, 0.79), rgba(5, 14, 24, 0.93));
}

.card-back {
  transform: rotateY(180deg);
  background: #101d2b;
}

.card-back::after { background: linear-gradient(180deg, rgba(8, 21, 35, 0.94), rgba(5, 13, 23, 0.97)); }

.prompt-label-row {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.prompt-category {
  min-width: 0;
  margin: 0;
  overflow-wrap: anywhere;
  font-size: 0.73rem;
  font-weight: 750;
  letter-spacing: 0.045em;
  line-height: 1.25;
  text-transform: uppercase;
}

.flip-hint {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: rgba(255,255,255,.78);
  font-size: 0.73rem;
  font-weight: 600;
}

.flip-hint svg, .back-button svg {
  width: 16px;
  height: 16px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.prompt-title {
  margin: 20px 0 0;
  overflow-wrap: anywhere;
  font-size: clamp(1.45rem, 1.9vw, 1.87rem);
  font-weight: 650;
  line-height: 1.16;
  letter-spacing: -0.025em;
}

.prompt-description {
  max-width: 37ch;
  margin: 14px 0 24px;
  color: var(--card-muted);
  font-size: 1.01rem;
  line-height: 1.5;
}

.copy-button, .back-button {
  display: inline-flex;
  min-height: 45px;
  align-items: center;
  justify-content: center;
  gap: 9px;
  border-radius: 6px;
  font-weight: 650;
}

.copy-button {
  margin-top: auto;
  padding: 0 19px;
  border: 1px solid rgba(255, 255, 255, 0.86);
  color: #16191e;
  background: rgba(255, 255, 255, 0.97);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.14);
  font-size: 0.98rem;
  transition: color 150ms ease, background 150ms ease, transform 150ms ease;
}

.copy-button:hover { background: #fff; transform: translateY(-1px); }
.copy-button.is-copied { color: var(--accent-dark); }
.copy-button svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.back-button {
  min-width: 38px;
  min-height: 34px;
  padding: 0 9px;
  border: 1px solid rgba(255,255,255,.35);
  color: #fff;
  background: rgba(255,255,255,.09);
}

.back-button:hover { background: rgba(255,255,255,.16); }

.prompt-text {
  width: 100%;
  margin: 17px 0 18px;
  padding-right: 8px;
  overflow: auto;
  color: rgba(255,255,255,.92);
  font-size: 0.91rem;
  line-height: 1.5;
  white-space: pre-wrap;
  scrollbar-color: rgba(255,255,255,.42) transparent;
  scrollbar-width: thin;
}

.card-back .prompt-title { margin-top: 15px; font-size: 1.27rem; }
.card-back .copy-button { flex: 0 0 auto; margin-top: 0; }

.empty-state {
  max-width: 520px;
  margin: 72px auto 0;
  padding: 34px;
  border: 1px solid rgba(63, 75, 93, 0.2);
  border-radius: 8px;
  text-align: center;
  background: rgba(255,255,255,.93);
  box-shadow: var(--shadow-control);
}

.empty-state h2 { margin: 0; font-size: 1.75rem; }
.empty-state p { margin: 10px 0 24px; color: var(--page-muted); }
#reset-filters { min-height: 44px; padding: 0 18px; border: 0; border-radius: 5px; color: #fff; background: var(--accent); font-weight: 650; }

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 20;
  display: flex;
  min-height: 50px;
  align-items: center;
  gap: 10px;
  padding: 0 17px;
  border: 1px solid rgba(71,32,165,.28);
  border-radius: 7px;
  color: var(--accent-dark);
  background: #fff;
  box-shadow: 0 12px 34px rgba(12,25,42,.23);
  font-weight: 650;
}

.toast svg { width: 19px; height: 19px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }

.task-button:focus-visible, .copy-button:focus-visible, .back-button:focus-visible, #reset-filters:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; }

.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  clip-path: inset(50%) !important;
}

@media (max-width: 1080px) {
  .library-shell { padding-right: 34px; padding-left: 34px; }
  .prompt-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 700px) {
  body { background-attachment: scroll; background-position: 55% 0; }
  .library-shell { padding: 32px 18px 58px; }
  .library-header h1 { font-size: clamp(2.65rem, 14vw, 4rem); }
  .library-header p { margin-top: 15px; font-size: 1rem; }
  .library-controls { margin-top: 21px; }
  .search-control { height: 54px; padding: 0 15px; }
  .search-control input { font-size: 1rem; }
  .browse-row { display: block; margin-top: 18px; }
  .task-navigation { gap: 24px; }
  .task-button { padding-bottom: 11px; font-size: 0.91rem; }
  .results-count { margin: 11px 0 10px; }
  .prompt-grid { grid-template-columns: 1fr; gap: 16px; margin-top: 18px; }
  .prompt-card { min-height: 306px; }
  .card-face { padding: 26px 23px 23px; }
  .card-face::before { background-size: cover; }
  .prompt-title { font-size: 1.68rem; }
  .prompt-description { font-size: 0.98rem; }
  .toast { right: 16px; bottom: 16px; left: 16px; justify-content: center; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}