/* Tailwind via CDN (utility-first) */
@import url("https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css");

:root {
  --c-bg-0: #0b0b14;
  --c-bg-1: #15162b;
  --c-bg-2: #1f2040;
  --c-text-0: #ffffff;
  --c-text-1: #c7c9e0;
  --c-text-2: #8a8db3;
  --c-primary-0: #7c5cff;
  --c-primary-1: #4f46e5;
  --c-accent: #22d3ee;
  --c-success: #22c55e;
  --c-danger: #ef4444;
  --c-warning: #f59e0b;
  --radius-card: 20px;
  --radius-btn: 14px;
  --shadow-card: 0 10px 40px -10px rgba(0, 0, 0, 0.6),
    0 0 0 1px rgba(255, 255, 255, 0.04) inset;
}

* {
  -webkit-tap-highlight-color: transparent;
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  font-family: "PingFang SC", "PingFang TC", "Microsoft YaHei",
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--c-bg-0);
  color: var(--c-text-0);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Animated gradient backdrop */
.app-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 60% at 20% 0%, rgba(124, 92, 255, 0.25), transparent 60%),
    radial-gradient(ellipse 60% 60% at 80% 30%, rgba(34, 211, 238, 0.18), transparent 65%),
    radial-gradient(ellipse 60% 50% at 50% 100%, rgba(79, 70, 229, 0.25), transparent 60%),
    var(--c-bg-0);
}

.app-bg::before {
  content: "";
  position: absolute;
  inset: -50%;
  background: conic-gradient(
    from 0deg at 50% 50%,
    rgba(124, 92, 255, 0.05),
    rgba(34, 211, 238, 0.05),
    rgba(79, 70, 229, 0.05),
    rgba(124, 92, 255, 0.05)
  );
  animation: spin 30s linear infinite;
  filter: blur(80px);
}

@keyframes spin {
  to {
    transform: rotate(1turn);
  }
}

/* Glassmorphism card */
.glass {
  background: linear-gradient(
    180deg,
    rgba(31, 32, 64, 0.65),
    rgba(21, 22, 43, 0.65)
  );
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
}

/* Inputs */
.field-label {
  font-size: 13px;
  font-weight: 600;
  color: var(--c-text-1);
  letter-spacing: 0.02em;
  margin-bottom: 8px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.field {
  width: 100%;
  background: rgba(11, 11, 20, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  color: var(--c-text-0);
  padding: 12px 14px;
  font-size: 14px;
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.2s;
  font-family: inherit;
  resize: vertical;
}

.field::placeholder {
  color: var(--c-text-2);
}

.field:focus {
  border-color: rgba(124, 92, 255, 0.7);
  box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.18);
  background: rgba(11, 11, 20, 0.85);
}

textarea.field {
  min-height: 96px;
  line-height: 1.55;
}

/* Preset chip group */
.chip-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.chip {
  flex: 1 1 0;
  min-width: 0;
  padding: 10px 8px;
  text-align: center;
  border-radius: 12px;
  background: rgba(11, 11, 20, 0.5);
  border: 1px solid rgba(255, 255, 255, 0.06);
  color: var(--c-text-1);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
}

.chip small {
  display: block;
  font-size: 11px;
  font-weight: 400;
  color: var(--c-text-2);
  margin-top: 2px;
}

.chip:active {
  transform: scale(0.97);
}

.chip.active {
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.25), rgba(34, 211, 238, 0.18));
  border-color: rgba(124, 92, 255, 0.7);
  color: #fff;
  box-shadow: 0 0 0 2px rgba(124, 92, 255, 0.25);
}

.chip.active small {
  color: var(--c-text-1);
}

/* Primary button with shimmer */
.btn-primary {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: 16px;
  border: 0;
  border-radius: var(--radius-btn);
  font-size: 16px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #7c5cff 0%, #4f46e5 50%, #22d3ee 100%);
  background-size: 200% 200%;
  cursor: pointer;
  overflow: hidden;
  transition: transform 0.1s ease, box-shadow 0.2s ease, opacity 0.2s ease;
  box-shadow: 0 8px 24px -8px rgba(124, 92, 255, 0.6);
  min-height: 56px;
}

.btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(
    120deg,
    transparent 0%,
    rgba(255, 255, 255, 0.25) 50%,
    transparent 100%
  );
  animation: shimmer 3s ease-in-out infinite;
}

@keyframes shimmer {
  to {
    left: 130%;
  }
}

.btn-primary:active {
  transform: scale(0.98);
}

.btn-primary[disabled] {
  opacity: 0.65;
  cursor: not-allowed;
}

.btn-primary.loading {
  background: linear-gradient(135deg, #4f46e5 0%, #7c5cff 100%);
  animation: pulse-glow 1.6s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 0 8px 24px -8px rgba(124, 92, 255, 0.6);
  }
  50% {
    box-shadow: 0 12px 36px -6px rgba(124, 92, 255, 0.95);
  }
}

.btn-secondary {
  flex: 1;
  padding: 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  color: var(--c-text-0);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.15s;
}

.btn-secondary:active {
  transform: scale(0.97);
  background: rgba(255, 255, 255, 0.1);
}

.btn-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 12px;
  color: var(--c-text-0);
  cursor: pointer;
}

.btn-icon:active {
  transform: scale(0.94);
}

/* Section heading */
.section-title {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-text-1);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}

.section-title::before {
  content: "";
  width: 4px;
  height: 14px;
  background: linear-gradient(180deg, #7c5cff, #22d3ee);
  border-radius: 2px;
}

/* Skeleton / shimmer for result placeholder */
.skeleton {
  position: relative;
  overflow: hidden;
  background: linear-gradient(
    100deg,
    rgba(255, 255, 255, 0.02) 30%,
    rgba(255, 255, 255, 0.08) 50%,
    rgba(255, 255, 255, 0.02) 70%
  );
  background-size: 200% 100%;
  animation: skeleton-loading 1.4s ease-in-out infinite;
  border-radius: 16px;
}

@keyframes skeleton-loading {
  to {
    background-position: -200% 0;
  }
}

/* Toast */
.toast {
  position: fixed;
  top: 16px;
  left: 16px;
  right: 16px;
  z-index: 50;
  padding: 14px 16px;
  border-radius: 14px;
  font-size: 14px;
  font-weight: 600;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 10px;
  transform: translateY(-150%);
  transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 12px 30px -6px rgba(0, 0, 0, 0.5);
}

.toast.show {
  transform: translateY(0);
}

.toast-error {
  background: linear-gradient(135deg, rgba(239, 68, 68, 0.95), rgba(190, 18, 60, 0.95));
}

.toast-success {
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.95), rgba(16, 185, 129, 0.95));
}

.toast-info {
  background: linear-gradient(135deg, rgba(124, 92, 255, 0.95), rgba(79, 70, 229, 0.95));
}

/* Result card slide-in */
.result-card {
  animation: slide-up 0.5s cubic-bezier(0.2, 0.8, 0.2, 1);
}

@keyframes slide-up {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Spinner */
.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin-fast 0.8s linear infinite;
}

@keyframes spin-fast {
  to {
    transform: rotate(360deg);
  }
}

/* Header */
.app-header {
  text-align: center;
  padding: 24px 16px 8px;
}

.app-header h1 {
  font-size: 22px;
  font-weight: 700;
  margin: 0;
  background: linear-gradient(135deg, #fff 0%, #c7c9e0 60%, #7c5cff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.03em;
}

.app-header p {
  font-size: 13px;
  color: var(--c-text-2);
  margin: 6px 0 12px;
  letter-spacing: 0.05em;
}

.app-header .accent-line {
  width: 64px;
  height: 3px;
  margin: 0 auto;
  border-radius: 2px;
  background: linear-gradient(90deg, #7c5cff 0%, #22d3ee 100%);
}

/* Content container */
.app-shell {
  max-width: 520px;
  margin: 0 auto;
  padding: 0 16px 120px;
}

.card {
  padding: 18px;
  margin-bottom: 14px;
}

/* Footer fixed action */
.action-bar {
  position: sticky;
  bottom: 0;
  padding: 14px 16px calc(14px + env(safe-area-inset-bottom));
  background: linear-gradient(180deg, transparent, rgba(11, 11, 20, 0.85) 35%, rgba(11, 11, 20, 0.95));
  backdrop-filter: blur(8px);
}

.metadata-line {
  display: flex;
  justify-content: space-between;
  font-size: 12px;
  color: var(--c-text-2);
  padding: 10px 4px 0;
}

.metadata-line code {
  color: var(--c-text-1);
  background: rgba(255, 255, 255, 0.06);
  padding: 2px 6px;
  border-radius: 6px;
  font-size: 11px;
}

/* Disclosure (negative prompt) */
details.collapsible > summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 13px;
  color: var(--c-text-1);
  padding: 4px 0;
}

details.collapsible > summary::-webkit-details-marker {
  display: none;
}

details.collapsible[open] > summary .chev {
  transform: rotate(180deg);
}

.chev {
  transition: transform 0.2s;
  color: var(--c-text-2);
}

/* Result image */
.result-img-wrap {
  border-radius: 16px;
  overflow: hidden;
  background: rgba(0, 0, 0, 0.3);
  position: relative;
  aspect-ratio: var(--ar, 2/3);
}

.result-img-wrap img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}