:root {
  font-family: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, "Helvetica Neue", sans-serif;
  color: #0f172a;
  background-color: #f5f7fb;
  line-height: 1.5;
  
  /* Light mode colors */
  --bg-primary: #f5f7fb;
  --bg-secondary: #fff;
  --bg-tertiary: #f8fafc;
  --bg-dropzone: #f0f9ff;
  --bg-dropzone-active: #e0f2fe;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --border-color: rgba(15, 23, 42, 0.2);
  --shadow: rgba(15, 23, 42, 0.08);
}

body.dark-mode {
  --bg-primary: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-dropzone: #1e3a5f;
  --bg-dropzone-active: #1e4a7e;
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --border-color: rgba(255, 255, 255, 0.2);
  --shadow: rgba(0, 0, 0, 0.3);
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: radial-gradient(circle at top, #e2e8ff 0%, var(--bg-primary) 45%, var(--bg-primary) 100%);
  padding: 0 16px 40px;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body.dark-mode {
  background: radial-gradient(circle at top, #1e3a5f 0%, var(--bg-primary) 45%, var(--bg-primary) 100%);
}

.site-header,
.site-footer,
.app-shell {
  max-width: 960px;
  margin: 0 auto;
}

.site-header {
  text-align: center;
  padding: 32px 0 16px;
  position: relative;
}

.header-top {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  position: relative;
}

.dark-mode-toggle {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  width: 44px;
  height: 44px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 2px 8px var(--shadow);
}

.dark-mode-toggle:hover {
  transform: translateY(-50%) scale(1.1);
}

.dark-mode-toggle .light-icon {
  display: none;
}

body.dark-mode .dark-mode-toggle .dark-icon {
  display: none;
}

body.dark-mode .dark-mode-toggle .light-icon {
  display: block;
}

.site-header h1 {
  margin: 0 0 8px;
  font-size: clamp(1.8rem, 4vw, 2.6rem);
}

.subtitle {
  margin: 0 0 12px;
  color: var(--text-secondary);
}

.privacy-note {
  font-size: 0.95rem;
  color: #0f766e;
  font-weight: 600;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}

.uploader {
  background: var(--bg-secondary);
  border-radius: 16px;
  padding: 24px;
  box-shadow: 0 30px 80px var(--shadow);
  transition: background-color 0.3s ease;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-bottom: 16px;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 12px 24px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: 600;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn.primary {
  background: #1d4ed8;
  color: #fff;
  box-shadow: 0 10px 20px rgba(29, 78, 216, 0.25);
}

.btn.accent {
  background: linear-gradient(135deg, #14b8a6, #0ea5e9);
  color: #fff;
  box-shadow: 0 10px 25px rgba(14, 165, 233, 0.3);
  width: 100%;
}

.btn.ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.btn.secondary {
  background: #64748b;
  color: #fff;
  box-shadow: 0 10px 20px rgba(100, 116, 139, 0.25);
  width: 100%;
  margin-top: 8px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
}

.btn:not(:disabled):hover {
  transform: translateY(-1px) scale(1.01);
}

.drop-zone {
  border: 2px dashed rgba(14, 116, 144, 0.4);
  border-radius: 16px;
  padding: 32px;
  text-align: center;
  color: var(--text-secondary);
  background: var(--bg-dropzone);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.drop-zone.active {
  border-color: #0ea5e9;
  background: var(--bg-dropzone-active);
}

.settings {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 16px;
  margin: 24px 0 16px;
}

.setting label {
  display: block;
  font-size: 0.9rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
}

.setting select,
.setting input {
  width: 100%;
  padding: 10px 12px;
  border-radius: 12px;
  border: 1px solid var(--border-color);
  font-size: 1rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

.setting-full {
  grid-column: 1 / -1;
}

.actions {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 16px;
}

.instruction-note {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  margin: 0 0 8px;
}

.status {
  min-height: 24px;
  text-align: center;
  font-weight: 600;
  color: var(--text-primary);
}

.error {
  color: #dc2626;
  font-weight: 600;
  min-height: 20px;
  text-align: center;
}

.order-note {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  margin: 16px 0 8px;
  padding: 12px;
  background: var(--bg-dropzone);
  border-radius: 8px;
  border-left: 3px solid #0ea5e9;
  transition: background-color 0.3s ease;
}

.preview-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.preview-card {
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 12px;
  background: var(--bg-tertiary);
  display: flex;
  flex-direction: column;
  gap: 10px;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.image-wrapper {
  position: relative;
  width: 100%;
  overflow: hidden;
  border-radius: 12px;
}

.preview-card img {
  width: 100%;
  height: 140px;
  object-fit: cover;
  border-radius: 12px;
  display: block;
  transition: transform 0.3s ease;
  transform-origin: center center;
}

.order-badge {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(29, 78, 216, 0.9);
  color: #fff;
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.preview-card .filename {
  font-size: 0.9rem;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-actions {
  display: flex;
  justify-content: space-between;
  gap: 6px;
}

.card-actions button {
  flex: 1;
  border: none;
  border-radius: 999px;
  padding: 8px 0;
  font-size: 0.85rem;
  cursor: pointer;
  background: var(--bg-dropzone);
  color: var(--text-primary);
  transition: background 0.2s ease;
}

.card-actions button:hover {
  background: var(--bg-dropzone-active);
}

body.dark-mode .card-actions button {
  background: #475569;
}

body.dark-mode .card-actions button:hover {
  background: #64748b;
}

.ad {
  border-radius: 16px;
  border: 2px dashed rgba(252, 211, 77, 0.8);
  background: rgba(253, 230, 138, 0.25);
  color: #a16207;
  text-align: center;
  padding: 24px;
  font-weight: 700;
}

.ad-top {
  max-width: 960px;
  margin: 16px auto;
}

.ad-column {
  display: none;
}

.site-footer {
  margin-top: 32px;
  text-align: center;
  color: var(--text-secondary);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Modal styles */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.7);
  align-items: center;
  justify-content: center;
  padding: 20px;
}

.modal-content {
  background: var(--bg-secondary);
  border-radius: 16px;
  max-width: 900px;
  width: 100%;
  max-height: 90vh;
  display: flex;
  flex-direction: column;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
  transition: background-color 0.3s ease;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  margin: 0;
  color: var(--text-primary);
}

.close-btn {
  background: none;
  border: none;
  font-size: 2rem;
  cursor: pointer;
  color: var(--text-secondary);
  line-height: 1;
  padding: 0;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.close-btn:hover {
  background: var(--bg-tertiary);
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
  overflow: auto;
  flex: 1;
}

.ad-footer {
  margin-bottom: 8px;
}

@media (min-width: 1024px) {
  .app-shell {
    grid-template-columns: 2fr 1fr;
    align-items: start;
  }

  .ad-column {
    display: block;
    position: sticky;
    top: 20px;
  }
}