/* Card Components */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  min-width: 0; /* Prevent blowout in flex/grid containers */
}

.card--flat {
  border: none;
  box-shadow: none;
}

.card--elevated {
  box-shadow: var(--shadow-md);
  border: none;
}

/* Card Header */
.card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.card__title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.card__subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin-top: var(--space-1);
}

.card__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Card Body */
.card__body {
  padding: var(--space-5);
}

.card__body--compact {
  padding: var(--space-4);
}

.card__body--flush {
  padding: 0;
}

/* Card Footer */
.card__footer {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg-alt);
}

/* Image Card */
.image-card {
  position: relative;
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 3;
}

.image-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.image-card__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.6), transparent);
  opacity: 0;
  transition: opacity var(--transition-fast);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: var(--space-4);
}

.image-card:hover .image-card__overlay {
  opacity: 1;
}

.image-card__actions {
  display: flex;
  gap: var(--space-2);
}

/* Sample Image Card */
.sample-card {
  position: relative;
  background: var(--color-bg-alt);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  cursor: pointer;
  transition: all var(--transition-fast);
  aspect-ratio: 4 / 3;
}

.sample-card:hover {
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.sample-card--selected {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px var(--color-primary-subtle);
}

.sample-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.sample-card__label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: var(--space-2) var(--space-3);
  background: linear-gradient(to top, rgba(0, 0, 0, 0.7), transparent);
  color: white;
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
}

.sample-card__check {
  position: absolute;
  top: var(--space-2);
  right: var(--space-2);
  width: 24px;
  height: 24px;
  background: var(--color-primary);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--transition-fast);
}

.sample-card--selected .sample-card__check {
  opacity: 1;
  transform: scale(1);
}

/* Result Card */
.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.result-card__image-container {
  position: relative;
  background: var(--color-bg-alt);
  aspect-ratio: 4 / 3;
}

.result-card__image {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.result-card__loading {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  background: var(--color-bg-alt);
}

.result-card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  border-top: 1px solid var(--color-border);
}

.result-card__info {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.result-card__actions {
  display: flex;
  gap: var(--space-2);
}

/* Stats Card */
.stats-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}

.stats-card__label {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.stats-card__value {
  font-size: var(--text-2xl);
  font-weight: var(--font-bold);
  color: var(--color-text);
}

.stats-card__trend {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  margin-top: var(--space-1);
}

.stats-card__trend--up {
  color: var(--color-success);
}

.stats-card__trend--down {
  color: var(--color-error);
}

/* ==========================================
   About Page Styles
   ========================================== */

.about-page {
  max-width: 900px;
  margin: 0 auto;
}

/* Hero Section */
.about-hero {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  background: linear-gradient(135deg, var(--color-primary-subtle) 0%, var(--color-surface) 100%);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-6);
}

.about-hero__logo {
  width: 80px;
  height: 80px;
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-lg);
}

.about-hero__title {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.about-hero__subtitle {
  font-size: var(--text-lg);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-6);
  line-height: var(--leading-relaxed);
}

.about-hero__actions {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  flex-wrap: wrap;
}

/* About Text */
.about-text {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

.about-text:last-child {
  margin-bottom: 0;
}

.about-heading {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin: var(--space-6) 0 var(--space-3);
}

.about-list {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  padding-left: var(--space-6);
  margin: 0;
}

.about-list li {
  margin-bottom: var(--space-2);
}

.about-list--numbered {
  list-style-type: decimal;
}

.about-list a {
  color: var(--color-primary);
  text-decoration: none;
}

.about-list a:hover {
  text-decoration: underline;
}

/* Features Grid */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-4);
}

.feature-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.feature-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.feature-card__icon {
  width: 40px;
  height: 40px;
  background: var(--color-primary-subtle);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  margin-bottom: var(--space-3);
}

.feature-card__title {
  font-size: var(--text-base);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.feature-card__description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin: 0;
}

/* API List */
.api-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.api-list__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-bg-alt);
  border-radius: var(--radius-md);
  flex-wrap: wrap;
}

.api-list__endpoint {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  background: var(--color-surface);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--color-primary);
  white-space: nowrap;
}

.api-list__description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

/* Links Grid */
.links-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-3);
}

.link-card {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.link-card:hover {
  border-color: var(--color-primary);
  background: var(--color-primary-subtle);
  text-decoration: none;
}

.link-card__icon {
  width: 36px;
  height: 36px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.link-card__content {
  flex: 1;
  min-width: 0;
}

.link-card__title {
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.link-card__url {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Benefits Grid */
.benefits-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.benefit-card {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  transition: all var(--transition-fast);
}

.benefit-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.benefit-card__icon {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, var(--color-primary) 0%, #8b5cf6 100%);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  margin-bottom: var(--space-4);
}

.benefit-card__icon svg {
  width: 24px;
  height: 24px;
}

.benefit-card__title {
  font-size: var(--text-lg);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.benefit-card__description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin: 0;
}

/* Comparison Table */
.comparison-table {
  overflow-x: auto;
}

.comparison-table table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.comparison-table th,
.comparison-table td {
  padding: var(--space-3) var(--space-4);
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}

.comparison-table th {
  background: var(--color-bg-alt);
  font-weight: var(--font-semibold);
  color: var(--color-text);
}

.comparison-table th:first-child {
  border-radius: var(--radius-md) 0 0 0;
}

.comparison-table th:last-child {
  border-radius: 0 var(--radius-md) 0 0;
}

.comparison-table td {
  color: var(--color-text-secondary);
}

.comparison-table tr:last-child td {
  border-bottom: none;
}

.comparison-table tr:hover td {
  background: var(--color-bg-alt);
}

.highlight-good {
  color: var(--color-success-text) !important;
  font-weight: var(--font-medium);
}

.highlight-bad {
  color: var(--color-text-tertiary) !important;
}

/* Tips Grid */
.tips-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.tip-card {
  display: flex;
  gap: var(--space-4);
  padding: var(--space-4);
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.tip-card__number {
  width: 32px;
  height: 32px;
  background: var(--color-primary);
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-bold);
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.tip-card__content {
  flex: 1;
}

.tip-card__content strong {
  display: block;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.tip-card__content p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: var(--leading-relaxed);
}

.tip-card__content a {
  color: var(--color-primary);
}

/* Code Examples */
.code-examples {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.code-example {
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
}

.code-example h4 {
  padding: var(--space-3) var(--space-4);
  margin: 0;
  font-size: var(--text-sm);
  font-weight: var(--font-semibold);
  color: var(--color-text);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.code-example pre {
  margin: 0;
  padding: var(--space-4);
  font-size: var(--text-xs);
  line-height: var(--leading-relaxed);
  overflow-x: auto;
  background: #1e293b;
}

.code-example code {
  color: #e2e8f0;
}

/* About Footer */
.about-footer {
  text-align: center;
  padding: var(--space-6);
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  border-top: 1px solid var(--color-border);
}

.about-footer__copyright {
  margin-top: var(--space-2);
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
}

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

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

  .code-examples {
    grid-template-columns: 1fr;
  }

  .comparison-table {
    font-size: var(--text-xs);
  }

  .comparison-table th,
  .comparison-table td {
    padding: var(--space-2) var(--space-3);
  }
}

@media (max-width: 640px) {
  .about-hero {
    padding: var(--space-6) var(--space-4);
  }

  .about-hero__title {
    font-size: var(--text-2xl);
  }

  .about-hero__subtitle {
    font-size: var(--text-base);
  }

  .api-list__item {
    flex-direction: column;
    align-items: flex-start;
  }

  .benefit-card {
    padding: var(--space-4);
  }

  .benefit-card__icon {
    width: 40px;
    height: 40px;
  }

  .benefit-card__icon svg {
    width: 20px;
    height: 20px;
  }

  .tip-card {
    flex-direction: column;
    gap: var(--space-3);
  }

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