@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+JP:wght@400;500;700&display=swap');

:root {
  --bg-dark: #021a1a;
  --bg-panel: rgba(4, 47, 46, 0.7);
  --border-color: #115e59;
  --border-hover: #2dd4bf;
  --text-main: #f0fdfa;
  --text-sub: #99f6e4;
  --accent: #2dd4bf;
  --accent-hover: #0d9488;
}

body {
  font-family: 'Noto Sans JP', sans-serif;
  background-color: var(--bg-dark);
  color: var(--text-main);
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-container {
  max-w-5xl: 1024px;
  width: 100%;
  max-width: 1024px;
  margin: 0 auto;
  padding: 0;
}

/* Header */
.header {
  background: rgba(2, 26, 26, 0.9);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.header h1 {
  font-size: 1.1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
}

.site-sub {
  display: block;
  font-size: 10px;
  color: var(--accent);
  font-weight: 400;
  line-height: 1;
  margin-bottom: 2px;
}

.back-link {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 700;
  border: 1px solid var(--border-color);
  padding: 0.375rem 0.75rem;
  border-radius: 0.375rem;
  transition: all 0.2s;
}

.back-link:hover {
  background: var(--border-color);
  color: #fff;
}

.header-desc {
  font-size: 0.875rem;
  color: var(--text-sub);
  margin: 1rem auto 0;
  max-width: 600px;
  text-align: center;
  line-height: 1.6;
}

.main-content {
  padding: 2rem 1.5rem;
}

/* Upload Area */
.upload-area {
  background: rgba(2, 26, 26, 0.5);
  border: 2px dashed var(--border-color);
  border-radius: 1rem;
  padding: 4rem 2rem;
  text-align: center;
  transition: all 0.3s;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 300px;
}

.upload-area:hover, .upload-area.drag-over {
  border-color: var(--border-hover);
  background: rgba(45, 212, 191, 0.06);
}

.hidden-input {
  display: none;
}

.upload-icon-wrapper {
  color: var(--accent);
  margin-bottom: 1rem;
  opacity: 0.8;
}

.upload-area h2 {
  font-size: 1.125rem;
  color: var(--text-sub);
  margin: 0 0 0.5rem 0;
}

.upload-area p {
  font-size: 0.875rem;
  color: #5eead4;
  margin: 0;
  opacity: 0.7;
}

/* Buttons */
.primary-btn {
  background: linear-gradient(135deg, #0d9488, #2dd4bf);
  color: #021a1a;
  border: none;
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: opacity 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.primary-btn:hover:not(:disabled) {
  opacity: 0.85;
}

.primary-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background: var(--border-color);
  color: #99f6e4;
}

.secondary-btn {
  background: transparent;
  color: var(--text-sub);
  border: 1px solid var(--border-color);
  padding: 0.75rem 1.5rem;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.secondary-btn.small {
  padding: 0.5rem 1rem;
}

.secondary-btn:hover {
  border-color: var(--border-hover);
  color: #fff;
}

.mt-4 { margin-top: 1rem; }
.hidden { display: none !important; }

/* Workspace */
.workspace-container {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: 1rem;
  padding: 1.5rem;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  animation: fadeUp 0.4s ease-out;
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.workspace-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
  gap: 1rem;
}

.workspace-header h3 {
  margin: 0 0 0.25rem 0;
  font-size: 1.125rem;
  color: var(--text-main);
}

.status-text {
  margin: 0;
  font-size: 0.75rem;
  color: var(--accent);
  font-weight: bold;
}

.workspace-actions {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Progress */
.progress-bar-container {
  height: 4px;
  background: #064e3b;
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 1.5rem;
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, #0d9488, #2dd4bf);
  transition: width 0.3s;
}

/* Image List */
.image-list-container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.image-item {
  background: #042f2e;
  border: 1px solid var(--border-color);
  border-radius: 0.75rem;
  padding: 1rem;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  animation: fadeUp 0.3s ease-out;
}

@media (max-width: 768px) {
  .image-item {
    grid-template-columns: 1fr;
  }
}

.img-box {
  background: #021a1a;
  border-radius: 0.5rem;
  border: 1px solid var(--border-color);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.img-box.result {
  border-color: var(--accent);
}

.img-box-header {
  padding: 0.5rem 0.75rem;
  font-size: 0.75rem;
  font-weight: bold;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.img-box.result .img-box-header {
  border-bottom-color: var(--accent);
  color: var(--accent);
}

.img-preview {
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.img-preview img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 4px;
}

.checker-bg {
  background-image: linear-gradient(45deg, #1a1a1a 25%, transparent 25%),
                    linear-gradient(-45deg, #1a1a1a 25%, transparent 25%),
                    linear-gradient(45deg, transparent 75%, #1a1a1a 75%),
                    linear-gradient(-45deg, transparent 75%, #1a1a1a 75%);
  background-size: 16px 16px;
  background-position: 0 0, 0 8px, 8px -8px, -8px 0;
  background-color: #2d2d2d;
}

.remove-item-btn {
  background: transparent;
  color: #ef4444;
  border: none;
  cursor: pointer;
  padding: 0.25rem;
  border-radius: 4px;
}
.remove-item-btn:hover { background: rgba(239, 68, 68, 0.1); }

.download-btn {
  background: #0d9488;
  color: #021a1a;
  border: none;
  border-radius: 4px;
  padding: 0.25rem 0.75rem;
  font-size: 0.7rem;
  font-weight: 700;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.25rem;
}
.download-btn:hover { background: var(--accent); }

/* Loader */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(45, 212, 191, 0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: inline-block;
}

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