/* ============================================================
   COLOR HEAVEN — style.css
   Design System: Playful Minimalism on Deep Blue
   ============================================================ */

/* ---------- 1. CSS VARIABLES (Design Tokens) ---------- */
:root {
  /* Brand Colors */
  --brand-bg:        #0d325a;   /* Deep Blue */
  --brand-bg-2:      #0a2847;   /* Darker panel */
  --brand-bg-3:      #112f54;   /* Card surface */
  --brand-accent:    #f2e9c1;   /* Cream */
  --brand-accent-2:  #e8d99a;   /* Warm cream (hover) */
  --brand-blue-mid:  #1a4a7a;   /* Mid blue */
  --brand-glow:      rgba(242, 233, 193, 0.12);

  /* UI Colors */
  --text-primary:    #f2e9c1;
  --text-secondary:  rgba(242, 233, 193, 0.65);
  --text-muted:      rgba(242, 233, 193, 0.35);
  --border-color:    rgba(242, 233, 193, 0.1);
  --border-hover:    rgba(242, 233, 193, 0.25);

  /* Pass/Fail Badges */
  --badge-pass:      #4ade80;
  --badge-fail:      #f87171;
  --badge-warn:      #facc15;

  /* Spacing */
  --space-xs:   4px;
  --space-sm:   8px;
  --space-md:   16px;
  --space-lg:   24px;
  --space-xl:   40px;
  --space-2xl:  64px;

  /* Radius */
  --radius-sm:  8px;
  --radius-md:  16px;
  --radius-lg:  24px;
  --radius-xl:  32px;

  /* Typography */
  --font-display: 'Nunito', sans-serif;
  --font-mono:    'Space Mono', monospace;

  /* Shadows */
  --shadow-card: 0 8px 32px rgba(0,0,0,0.35);
  --shadow-glow: 0 0 24px rgba(242, 233, 193, 0.08);

  /* Transitions */
  --transition-fast:   150ms ease;
  --transition-normal: 280ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-bounce: 360ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ---------- 2. RESET & BASE ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--brand-bg);
  color: var(--text-primary);
  font-family: var(--font-display);
  font-size: 16px;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  /* Subtle noise texture overlay */
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(26, 74, 122, 0.6) 0%, transparent 70%),
    url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.025'/%3E%3C/svg%3E");
}

/* ---------- 3. HEADER ---------- */
.site-header {
  padding: var(--space-xl) var(--space-lg) var(--space-lg);
  text-align: center;
  border-bottom: 1px solid var(--border-color);
  background: linear-gradient(180deg, rgba(10, 40, 71, 0.8) 0%, transparent 100%);
  backdrop-filter: blur(4px);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}

/* Actual logo image */
.site-logo {
  max-height: 72px;
  max-width: 340px;
  width: auto;
  object-fit: contain;
  filter: drop-shadow(0 4px 16px rgba(242, 233, 193, 0.2));
  transition: filter var(--transition-normal);
}
.site-logo:hover {
  filter: drop-shadow(0 4px 24px rgba(242, 233, 193, 0.4));
}

/* Fallback logo (if image missing) */
.logo-fallback {
  align-items: center;
  gap: var(--space-md);
}
.logo-icon {
  font-size: 2.5rem;
  line-height: 1;
}
.logo-text {
  font-size: 2rem;
  font-weight: 900;
  color: var(--brand-accent);
  letter-spacing: -0.02em;
}

.site-tagline {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

/* ---------- 4. MAIN LAYOUT ---------- */
.main-content {
  flex: 1;
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-lg);
  width: 100%;
}

/* ---------- 5. PICKER SECTION ---------- */
.picker-section {
  margin-bottom: var(--space-xl);
  animation: fadeInDown 0.5s ease both;
}

.picker-card {
  background: var(--brand-bg-3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-card), var(--shadow-glow);
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.picker-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--brand-accent);
  letter-spacing: 0.01em;
}
.label-icon {
  color: var(--brand-accent);
  font-size: 1rem;
  animation: spin 8s linear infinite;
}

.picker-controls {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* Hidden native color input, styled via wrapper */
.color-preview-wrap {
  position: relative;
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-hover);
  overflow: hidden;
  flex-shrink: 0;
  cursor: pointer;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
}
.color-preview-wrap:hover {
  border-color: var(--brand-accent);
  box-shadow: 0 0 0 4px var(--brand-glow);
}

.color-input {
  /* Expand native input to fill wrapper */
  position: absolute;
  top: -8px; left: -8px;
  width: calc(100% + 16px);
  height: calc(100% + 16px);
  border: none;
  cursor: pointer;
  opacity: 0; /* Hidden — we show the preview div */
}

.color-preview {
  position: absolute;
  inset: 0;
  background: #1e7fcb;
  pointer-events: none;
  transition: background var(--transition-fast);
}

.hex-input {
  background: var(--brand-bg-2);
  border: 2px solid var(--border-color);
  border-radius: var(--radius-md);
  color: var(--brand-accent);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  padding: var(--space-md) var(--space-lg);
  width: 160px;
  letter-spacing: 0.05em;
  transition: border-color var(--transition-normal), box-shadow var(--transition-normal);
  outline: none;
}
.hex-input:focus {
  border-color: var(--brand-accent);
  box-shadow: 0 0 0 4px var(--brand-glow);
}

.generate-btn {
  position: relative;
  background: var(--brand-accent);
  color: var(--brand-bg);
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 900;
  padding: var(--space-md) var(--space-xl);
  cursor: pointer;
  overflow: hidden;
  transition: transform var(--transition-bounce), box-shadow var(--transition-normal), background var(--transition-fast);
  flex-shrink: 0;
  letter-spacing: 0.02em;
}
.generate-btn:hover {
  background: var(--brand-accent-2);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(242, 233, 193, 0.25);
}
.generate-btn:active {
  transform: translateY(0);
  box-shadow: none;
}
.btn-shimmer {
  position: absolute;
  top: 0; left: -100%;
  width: 60%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.35), transparent);
  transform: skewX(-20deg);
  animation: shimmer 2.5s infinite;
}
.btn-text {
  position: relative;
  z-index: 1;
}

/* ---------- 6. PALETTES SECTION ---------- */
.palettes-section {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

/* Palette Block */
.palette-block {
  animation: fadeInUp 0.45s ease both;
  background: var(--brand-bg-3);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-normal);
}
.palette-block:hover {
  box-shadow: var(--shadow-card), var(--shadow-glow);
}

/* Staggered animation delays */
.palette-block:nth-child(1) { animation-delay: 0.05s; }
.palette-block:nth-child(2) { animation-delay: 0.12s; }
.palette-block:nth-child(3) { animation-delay: 0.19s; }
.palette-block:nth-child(4) { animation-delay: 0.26s; }
.palette-block:nth-child(5) { animation-delay: 0.33s; }

.palette-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg) var(--space-xl);
  border-bottom: 1px solid var(--border-color);
  flex-wrap: wrap;
  gap: var(--space-md);
}

.palette-title {
  font-size: 1.1rem;
  font-weight: 900;
  color: var(--brand-accent);
  letter-spacing: 0.02em;
}
.palette-description {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-weight: 600;
  margin-top: 2px;
}

.export-btn {
  background: transparent;
  border: 1px solid var(--border-hover);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 700;
  padding: var(--space-xs) var(--space-md);
  cursor: pointer;
  transition: all var(--transition-normal);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  white-space: nowrap;
}
.export-btn:hover {
  border-color: var(--brand-accent);
  color: var(--brand-accent);
  background: var(--brand-glow);
}
.export-btn svg {
  width: 14px; height: 14px;
  stroke: currentColor;
}

/* Color Swatches Grid */
.swatches-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  min-height: 200px;
}

.swatch {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-md);
  cursor: pointer;
  overflow: hidden;
  transition: flex-grow var(--transition-bounce);
  min-height: 180px;
}
.swatch:hover {
  flex-grow: 1.8;
}

/* Overlay on hover */
.swatch::after {
  content: '';
  position: absolute;
  inset: 0;
  background: rgba(0,0,0,0.0);
  transition: background var(--transition-normal);
}
.swatch:hover::after {
  background: rgba(0,0,0,0.08);
}

.swatch-info {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transform: translateY(4px);
  transition: transform var(--transition-normal);
}
.swatch:hover .swatch-info {
  transform: translateY(0);
}

.swatch-hex {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 4px 8px;
  border-radius: 6px;
  backdrop-filter: blur(8px);
  background: rgba(0,0,0,0.25);
  transition: background var(--transition-fast);
  width: fit-content;
}
.swatch:hover .swatch-hex {
  background: rgba(0,0,0,0.45);
}
.copy-icon {
  opacity: 0;
  transition: opacity var(--transition-fast);
  font-size: 0.65rem;
}
.swatch:hover .copy-icon {
  opacity: 1;
}

/* Accessibility Badge */
.wcag-badge {
  font-size: 0.6rem;
  font-weight: 800;
  font-family: var(--font-display);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 7px;
  border-radius: 999px;
  width: fit-content;
  backdrop-filter: blur(8px);
}
.wcag-badge.pass {
  background: rgba(74, 222, 128, 0.2);
  color: var(--badge-pass);
  border: 1px solid rgba(74, 222, 128, 0.4);
}
.wcag-badge.fail {
  background: rgba(248, 113, 113, 0.2);
  color: var(--badge-fail);
  border: 1px solid rgba(248, 113, 113, 0.3);
}
.wcag-badge.warn {
  background: rgba(250, 204, 21, 0.2);
  color: var(--badge-warn);
  border: 1px solid rgba(250, 204, 21, 0.3);
}

/* ---------- 7. TOAST ---------- */
.toast {
  position: fixed;
  bottom: var(--space-xl);
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--brand-accent);
  color: var(--brand-bg);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 800;
  padding: var(--space-md) var(--space-xl);
  border-radius: 999px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
  opacity: 0;
  pointer-events: none;
  z-index: 9999;
  transition: opacity var(--transition-normal), transform var(--transition-normal);
  white-space: nowrap;
}
.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ---------- 8. FOOTER ---------- */
.site-footer {
  text-align: center;
  padding: var(--space-xl) var(--space-lg);
  color: var(--text-muted);
  font-size: 0.8rem;
  font-weight: 600;
  border-top: 1px solid var(--border-color);
}
.site-footer strong {
  color: var(--text-secondary);
}

/* ---------- 9. EMPTY STATE ---------- */
.empty-state {
  text-align: center;
  padding: var(--space-2xl);
  color: var(--text-muted);
  animation: fadeInUp 0.4s ease both;
}
.empty-state-icon {
  font-size: 4rem;
  margin-bottom: var(--space-md);
  display: block;
  animation: float 3s ease-in-out infinite;
}
.empty-state h2 {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--text-secondary);
  margin-bottom: var(--space-sm);
}
.empty-state p {
  font-size: 0.9rem;
}

/* ---------- 10. ANIMATIONS ---------- */
@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-16px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

@keyframes shimmer {
  0%   { left: -100%; }
  60%  { left: 150%; }
  100% { left: 150%; }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-12px); }
}

@keyframes pop {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.08); }
  100% { transform: scale(1); }
}
.swatch.copied {
  animation: pop 0.3s ease;
}

/* ---------- 11. RESPONSIVE ---------- */

/* Tablet */
@media (max-width: 768px) {
  .site-header {
    padding: var(--space-lg) var(--space-md) var(--space-md);
    position: static;
  }

  .main-content {
    padding: var(--space-lg) var(--space-md);
  }

  .picker-card {
    padding: var(--space-lg);
  }

  .picker-controls {
    flex-direction: column;
    align-items: flex-start;
  }

  .hex-input {
    width: 100%;
  }

  .generate-btn {
    width: 100%;
    padding: var(--space-md);
  }

  .swatches-grid {
    grid-template-columns: repeat(5, 1fr);
    min-height: 140px;
  }

  .swatch {
    min-height: 140px;
    padding: var(--space-sm);
  }

  .swatch-hex {
    font-size: 0.6rem;
    padding: 3px 5px;
  }

  .wcag-badge {
    display: none; /* Hide on small screens to avoid clutter */
  }
}

/* Mobile */
@media (max-width: 480px) {
  :root {
    font-size: 14px;
  }

  .site-logo {
    max-height: 52px;
  }

  .swatches-grid {
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto;
  }

  .swatch {
    min-height: 120px;
  }

  .palette-header {
    padding: var(--space-md);
  }

  .palette-title {
    font-size: 1rem;
  }
}