/* ========================================
   ColorCollage — Refined Warm Gallery Theme
   ======================================== */

:root {
  --charcoal: #2f3a42;
  --slate: #6a7b8a;
  --warm-slate: #8a9aaa;
  --light-warm: #e4e0da;
  --bg-warm: #f5f2ee;
  --card-bg: #ffffff;
  --shadow: rgba(47, 58, 66, 0.06);
  --shadow-hover: rgba(47, 58, 66, 0.10);
  --font-brand: 'Cormorant Garamond', Georgia, serif;
  --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; }

body {
  font-family: var(--font-ui);
  background: var(--bg-warm);
  color: var(--charcoal);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Header
   ======================================== */
.site-header {
  text-align: center;
  padding: 3rem 1rem 2rem;
  border-bottom: 1px solid var(--light-warm);
  margin-bottom: 0.5rem;
}

.logo {
  font-family: var(--font-brand);
  font-weight: 700;
  font-size: 2.8rem;
  letter-spacing: -0.02em;
  color: var(--charcoal);
  line-height: 1.1;
}

.tagline {
  font-family: var(--font-ui);
  font-weight: 300;
  font-size: 1.05rem;
  color: var(--warm-slate);
  margin-top: 0.5rem;
  letter-spacing: 0.01em;
}

/* ========================================
   Upload Zone
   ======================================== */
.upload-zone {
  max-width: 560px;
  margin: 2.5rem auto 2rem;
  padding: 0 1rem;
}

.upload-content {
  border: 2px dashed var(--light-warm);
  border-radius: 20px;
  padding: 3.5rem 2rem;
  text-align: center;
  cursor: pointer;
  background: var(--card-bg);
  transition: border-color 0.35s ease, background 0.35s ease, transform 0.35s ease, box-shadow 0.35s ease;
  box-shadow: 0 2px 12px var(--shadow);
}

.upload-content:hover {
  border-color: var(--slate);
  background: #faf9f7;
  transform: translateY(-2px);
  box-shadow: 0 8px 28px var(--shadow-hover);
}

.upload-zone.dragover .upload-content {
  border-color: var(--charcoal);
  background: #f0ece6;
  transform: scale(1.02);
  box-shadow: 0 12px 36px var(--shadow-hover);
}

.upload-icon {
  width: 52px;
  height: 52px;
  color: var(--slate);
  margin-bottom: 1.25rem;
  transition: color 0.3s ease, transform 0.3s ease;
}

.upload-content:hover .upload-icon {
  color: var(--charcoal);
  transform: translateY(-3px);
}

.upload-text {
  font-size: 1.1rem;
  color: var(--charcoal);
  margin-bottom: 0.6rem;
  font-weight: 400;
}

.upload-link {
  color: var(--slate);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color 0.2s ease;
}

.upload-link:hover {
  color: var(--charcoal);
}

.upload-hint {
  font-size: 0.78rem;
  color: var(--warm-slate);
  font-weight: 300;
  letter-spacing: 0.02em;
}

/* ========================================
   App Area
   ======================================== */
.app-area {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem 2.5rem;
  width: 100%;
}

.panels {
  display: flex;
  gap: 2.5rem;
  align-items: flex-start;
}

.image-panel {
  flex: 1;
  min-width: 0;
}

#image-canvas {
  width: 100%;
  max-height: 65vh;
  object-fit: contain;
  border-radius: 16px;
  box-shadow: 0 6px 24px var(--shadow-hover);
  display: block;
  background: var(--card-bg);
}

.palette-panel {
  flex: 1;
  min-width: 0;
}

.swatches-container {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

/* ========================================
   Swatch Card
   ======================================== */
.swatch-card {
  border-radius: 16px;
  overflow: hidden;
  background: var(--card-bg);
  box-shadow: 0 3px 16px var(--shadow);
  transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94), box-shadow 0.3s ease;
}

.swatch-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 28px var(--shadow-hover);
}

.swatch-color {
  height: 140px;
  width: 100%;
  position: relative;
  transition: height 0.3s ease;
}

.swatch-info {
  padding: 1.25rem 1.5rem;
}

.swatch-name {
  font-family: var(--font-brand);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--charcoal);
  margin-bottom: 0.6rem;
  letter-spacing: 0.01em;
}

.swatch-values {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-bottom: 1rem;
}

.swatch-value {
  font-family: 'SF Mono', 'Fira Code', Monaco, Consolas, monospace;
  font-size: 0.78rem;
  background: var(--bg-warm);
  padding: 0.35rem 0.75rem;
  border-radius: 8px;
  color: var(--slate);
  cursor: pointer;
  user-select: all;
  transition: background 0.2s ease, color 0.2s ease, transform 0.15s ease;
  border: 1px solid transparent;
  font-feature-settings: "tnum";
  letter-spacing: 0.02em;
}

.swatch-value:hover {
  background: var(--light-warm);
  color: var(--charcoal);
  transform: scale(1.04);
  border-color: var(--light-warm);
}

.swatch-copy-btn {
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 500;
  padding: 0.4rem 1rem;
  border: 1.5px solid var(--light-warm);
  background: var(--card-bg);
  color: var(--slate);
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.swatch-copy-btn:hover {
  background: var(--charcoal);
  color: var(--card-bg);
  border-color: var(--charcoal);
  transform: translateY(-1px);
  box-shadow: 0 2px 8px var(--shadow-hover);
}

/* ========================================
   Action Bar
   ======================================== */
.action-bar {
  position: sticky;
  bottom: 0;
  background: rgba(245, 242, 238, 0.92);
  border-top: 1px solid var(--light-warm);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  z-index: 10;
  backdrop-filter: blur(12px) saturate(1.2);
  -webkit-backdrop-filter: blur(12px) saturate(1.2);
}

.action-group {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.65rem 1.3rem;
  border-radius: 10px;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  letter-spacing: 0.01em;
}

.btn-primary {
  background: var(--charcoal);
  color: var(--card-bg);
}

.btn-primary:hover {
  background: #1f282f;
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(47, 58, 66, 0.25);
}

.btn-secondary {
  background: var(--card-bg);
  color: var(--charcoal);
  border-color: var(--light-warm);
}

.btn-secondary:hover {
  border-color: var(--slate);
  background: #faf9f7;
  transform: translateY(-1px);
  box-shadow: 0 2px 10px var(--shadow);
}

/* Color Count Toggle */
.color-count-toggle {
  display: flex;
  border: 1.5px solid var(--light-warm);
  border-radius: 10px;
  overflow: hidden;
  background: var(--card-bg);
}

.btn-count {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.55rem 1.1rem;
  border: none;
  background: var(--card-bg);
  color: var(--slate);
  cursor: pointer;
  transition: all 0.2s ease;
}

.btn-count:not(:last-child) {
  border-right: 1.5px solid var(--light-warm);
}

.btn-count:hover {
  background: var(--bg-warm);
  color: var(--charcoal);
}

.btn-count.active {
  background: var(--charcoal);
  color: var(--card-bg);
}

/* ========================================
   Modal
   ======================================== */
.modal {
  position: fixed;
  inset: 0;
  background: rgba(47, 58, 66, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 1.5rem;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.modal:not(.hidden) {
  opacity: 1;
}

.modal-content {
  background: var(--card-bg);
  border-radius: 20px;
  padding: 2.5rem;
  max-width: 440px;
  width: 100%;
  position: relative;
  box-shadow: 0 24px 64px rgba(47, 58, 66, 0.18);
  transform: translateY(8px);
  transition: transform 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.modal:not(.hidden) .modal-content {
  transform: translateY(0);
}

.poster-modal-content {
  max-width: 540px;
}

.modal-close {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  background: none;
  border: none;
  font-size: 1.5rem;
  color: var(--warm-slate);
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all 0.2s ease;
}

.modal-close:hover {
  background: var(--bg-warm);
  color: var(--charcoal);
}

.modal h3 {
  font-family: var(--font-brand);
  font-weight: 600;
  font-size: 1.6rem;
  margin-bottom: 1.5rem;
  color: var(--charcoal);
}

.export-options {
  display: flex;
  gap: 0.85rem;
}

.btn-export {
  flex: 1;
  background: var(--card-bg);
  color: var(--charcoal);
  border: 1.5px solid var(--light-warm);
  padding: 0.8rem;
  font-weight: 500;
  border-radius: 10px;
  cursor: pointer;
  transition: all 0.2s ease;
  font-family: var(--font-ui);
  font-size: 0.85rem;
}

.btn-export:hover {
  background: var(--charcoal);
  color: var(--card-bg);
  border-color: var(--charcoal);
  transform: translateY(-1px);
  box-shadow: 0 4px 14px rgba(47, 58, 66, 0.2);
}

#poster-canvas {
  width: 100%;
  max-height: 55vh;
  object-fit: contain;
  border-radius: 12px;
  box-shadow: 0 6px 24px var(--shadow-hover);
  margin-bottom: 1.25rem;
  display: block;
  background: var(--bg-warm);
}

.poster-actions {
  text-align: center;
}

.poster-hint {
  font-size: 0.82rem;
  color: var(--warm-slate);
  margin-top: 0.85rem;
  line-height: 1.5;
}

.poster-hint a {
  color: var(--charcoal);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ========================================
   Footer
   ======================================== */
.site-footer {
  text-align: center;
  padding: 2.5rem 1rem;
  font-size: 0.8rem;
  color: var(--warm-slate);
  font-weight: 300;
  letter-spacing: 0.02em;
  border-top: 1px solid var(--light-warm);
  margin-top: auto;
}

/* ========================================
   Utilities
   ======================================== */
.hidden {
  display: none !important;
}

/* ========================================
   Responsive
   ======================================== */
@media (max-width: 768px) {
  .panels {
    flex-direction: column;
  }

  .image-panel,
  .palette-panel {
    width: 100%;
  }

  .action-bar {
    flex-direction: column;
    align-items: stretch;
    padding: 0.85rem 1.25rem;
  }

  .action-group {
    justify-content: center;
  }

  .logo {
    font-size: 2.2rem;
  }

  .upload-content {
    padding: 2.5rem 1.5rem;
  }

  .swatch-color {
    height: 110px;
  }

  .site-header {
    padding: 2.5rem 1rem 1.5rem;
  }
}

@media (max-width: 480px) {
  .logo {
    font-size: 1.9rem;
  }

  .tagline {
    font-size: 0.95rem;
  }

  .swatch-info {
    padding: 1rem 1.25rem;
  }

  .swatch-name {
    font-size: 1.05rem;
  }

  .swatch-values {
    gap: 0.45rem;
  }

  .swatch-value {
    font-size: 0.73rem;
    padding: 0.25rem 0.55rem;
  }

  .upload-content {
    padding: 2rem 1.25rem;
  }

  .modal-content {
    padding: 1.75rem;
  }
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: 90px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--charcoal);
  color: var(--card-bg);
  padding: 0.7rem 1.4rem;
  border-radius: 10px;
  font-size: 0.85rem;
  font-weight: 500;
  opacity: 0;
  transition: opacity 0.35s ease, transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  z-index: 200;
  pointer-events: none;
  box-shadow: 0 4px 16px rgba(47, 58, 66, 0.2);
  letter-spacing: 0.01em;
}

.toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}