/* ─── Design Tokens ─────────────────────────────────────────────────────── */
:root {
  --bg-primary: hsl(225, 25%, 6%);
  --bg-secondary: hsl(225, 20%, 10%);
  --bg-card: hsl(225, 18%, 13%);
  --bg-card-hover: hsl(225, 18%, 16%);
  --bg-input: hsl(225, 20%, 8%);

  --text-primary: hsl(0, 0%, 95%);
  --text-secondary: hsl(225, 10%, 60%);
  --text-muted: hsl(225, 10%, 40%);

  --accent-1: hsl(250, 90%, 65%);
  --accent-2: hsl(280, 85%, 60%);
  --accent-3: hsl(200, 90%, 55%);

  --gradient-primary: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  --gradient-accent: linear-gradient(135deg, var(--accent-3), var(--accent-1));
  --gradient-glow: linear-gradient(135deg, hsla(250, 90%, 65%, 0.15), hsla(280, 85%, 60%, 0.15));

  --border-subtle: hsl(225, 15%, 18%);
  --border-accent: hsla(250, 90%, 65%, 0.3);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-card: 0 4px 24px hsla(0, 0%, 0%, 0.3);
  --shadow-glow: 0 0 40px hsla(250, 90%, 65%, 0.15);

  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

/* ─── Reset ─────────────────────────────────────────────────────────────── */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ─── Background Effects ────────────────────────────────────────────────── */
.bg-grid {
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(hsla(225, 15%, 20%, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, hsla(225, 15%, 20%, 0.06) 1px, transparent 1px);
  background-size: 60px 60px;
  pointer-events: none;
  z-index: 0;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
  animation: float 12s ease-in-out infinite;
}

.bg-glow-1 {
  width: 500px;
  height: 500px;
  background: hsla(250, 80%, 55%, 0.08);
  top: -100px;
  right: -100px;
}

.bg-glow-2 {
  width: 400px;
  height: 400px;
  background: hsla(280, 80%, 50%, 0.06);
  bottom: -50px;
  left: -50px;
  animation-delay: -6s;
}

@keyframes float {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(30px, -30px) scale(1.05); }
  66% { transform: translate(-20px, 20px) scale(0.95); }
}

/* ─── Container ─────────────────────────────────────────────────────────── */
.container {
  position: relative;
  z-index: 1;
  max-width: 780px;
  margin: 0 auto;
  padding: 40px 20px 60px;
}


/* ─── Prompt Input ──────────────────────────────────────────────────────── */
.prompt-section {
  margin-bottom: 32px;
}

.input-wrapper {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}

.input-wrapper:focus-within {
  border-color: var(--border-accent);
  box-shadow: var(--shadow-glow);
}

.input-glow {
  position: absolute;
  top: -1px;
  left: -1px;
  right: -1px;
  height: 3px;
  background: var(--gradient-primary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.input-wrapper:focus-within .input-glow {
  opacity: 1;
}

.prompt-input {
  width: 100%;
  padding: 20px 20px 12px;
  background: transparent;
  border: none;
  color: var(--text-primary);
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  resize: none;
  outline: none;
}

.prompt-input::placeholder {
  color: var(--text-muted);
}

.input-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px 12px;
}

.char-count {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.generate-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--transition-fast), box-shadow var(--transition-normal), opacity var(--transition-fast);
}

.generate-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px hsla(250, 90%, 65%, 0.3);
}

.generate-btn:active {
  transform: translateY(0);
}

.generate-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-icon {
  width: 16px;
  height: 16px;
}

/* ─── Status Card ───────────────────────────────────────────────────────── */
.status-section {
  margin-bottom: 32px;
  animation: fadeIn 0.3s ease;
}

.skeleton-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  width: 100%;
}

.skeleton-panel {
  aspect-ratio: 1 / 1.8;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, hsl(210, 5%, 45%), hsl(210, 5%, 65%), hsl(210, 5%, 45%));
  background-size: 200% 200%;
  animation: skeletonShimmer 2s ease-in-out infinite;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 12px hsla(0,0%,0%,0.2);
}

.skeleton-panel::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url('data:image/svg+xml,%3Csvg viewBox="0 0 200 200" xmlns="http://www.w3.org/2000/svg"%3E%3Cfilter id="noiseFilter"%3E%3CfeTurbulence type="fractalNoise" baseFrequency="0.8" numOctaves="3" stitchTiles="stitch"/%3E%3C/filter%3E%3Crect width="100%25" height="100%25" filter="url(%23noiseFilter)" opacity="0.15"/%3E%3C/svg%3E');
  mix-blend-mode: overlay;
  pointer-events: none;
}

@keyframes skeletonShimmer {
  0% { background-position: 100% 50%; }
  50% { background-position: 0% 50%; }
  100% { background-position: 100% 50%; }
}

/* ─── Error Card ────────────────────────────────────────────────────────── */
.error-section {
  margin-bottom: 32px;
  animation: fadeIn 0.3s ease;
}

.error-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 32px;
  background: hsla(0, 60%, 50%, 0.06);
  border: 1px solid hsla(0, 60%, 50%, 0.15);
  border-radius: var(--radius-lg);
}

.error-icon {
  width: 40px;
  height: 40px;
  color: hsl(0, 70%, 55%);
}

.error-message {
  color: hsl(0, 60%, 70%);
  text-align: center;
  font-size: 0.95rem;
}

.retry-btn {
  padding: 8px 20px;
  background: transparent;
  color: var(--accent-1);
  border: 1px solid var(--border-accent);
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.retry-btn:hover {
  background: hsla(250, 90%, 65%, 0.1);
  color: white;
}

/* ─── Gallery ───────────────────────────────────────────────────────────── */
.gallery-section {
  margin-bottom: 40px;
  animation: fadeInUp 0.5s ease;
}

.gallery-title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.gallery-icon {
  width: 22px;
  height: 22px;
  color: var(--accent-1);
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.gallery-item {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  cursor: pointer;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  animation: fadeInUp 0.4s ease;
}

.gallery-item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-glow);
  border-color: var(--border-accent);
}

.gallery-item img {
  width: 100%;
  display: block;
  aspect-ratio: 1;
  object-fit: cover;
}

.gallery-item .download-btn {
  position: absolute;
  bottom: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: hsla(0, 0%, 0%, 0.6);
  backdrop-filter: blur(8px);
  border: 1px solid hsla(0, 0%, 100%, 0.1);
  border-radius: 50%;
  color: white;
  cursor: pointer;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), background var(--transition-fast);
}

.gallery-item:hover .download-btn {
  opacity: 1;
  transform: translateY(0);
}

.download-btn:hover {
  background: hsla(250, 90%, 65%, 0.6);
}

.download-btn svg {
  width: 18px;
  height: 18px;
}

/* ─── History ───────────────────────────────────────────────────────────── */
.history-title {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 16px;
  color: var(--text-secondary);
}

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

.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.history-item:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
}

.history-prompt {
  flex: 1;
  font-size: 0.9rem;
  color: var(--text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.history-count {
  font-size: 0.8rem;
  color: var(--text-muted);
  background: var(--bg-input);
  padding: 2px 8px;
  border-radius: 100px;
}

/* ─── Lightbox ──────────────────────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: fadeIn 0.2s ease;
}

.lightbox-backdrop {
  position: absolute;
  inset: 0;
  background: hsla(0, 0%, 0%, 0.85);
  backdrop-filter: blur(8px);
}

.lightbox-content {
  position: relative;
  max-width: 90vw;
  max-height: 90vh;
}

.lightbox-close {
  position: absolute;
  top: -40px;
  right: 0;
  width: 32px;
  height: 32px;
  background: hsla(0, 0%, 100%, 0.1);
  border: 1px solid hsla(0, 0%, 100%, 0.2);
  border-radius: 50%;
  color: white;
  font-size: 1rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast);
}

.lightbox-close:hover {
  background: hsla(0, 0%, 100%, 0.2);
}

.lightbox-img {
  max-width: 90vw;
  max-height: 85vh;
  border-radius: var(--radius-md);
  box-shadow: 0 8px 40px hsla(0, 0%, 0%, 0.5);
}

/* ─── Footer ────────────────────────────────────────────────────────────── */
.footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 0.8rem;
  border-top: 1px solid var(--border-subtle);
}

/* ─── Animations ────────────────────────────────────────────────────────── */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ─── Responsive ────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .skeleton-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .container {
    padding: 24px 16px 40px;
  }

  .header h1 {
    font-size: 1.5rem;
  }

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

  .generate-btn span {
    display: none;
  }

  .generate-btn {
    padding: 10px 14px;
  }
}