/**
 * Modern CSS styles for ImageVault
 * Using CSS Custom Properties, logical properties, modern units, and more
 */

:root {
  /* Colors - Using modern color space for better consistency */
  --color-primary: oklch(55% 0.15 250);
  --color-primary-hover: oklch(50% 0.15 250);
  --color-primary-disabled: oklch(75% 0 0);
  
  --color-text: oklch(25% 0 0);
  --color-text-secondary: oklch(45% 0 0);
  --color-text-muted: oklch(55% 0 0);
  
  --color-bg: oklch(96% 0 0);
  --color-bg-secondary: oklch(98% 0 0);
  --color-bg-tertiary: oklch(95% 0 0);
  --color-surface: oklch(100% 0 0);
  --color-surface-hover: oklch(94% 0 0);
  
  --color-border: oklch(90% 0 0);
  --color-border-hover: oklch(70% 0 0);
  
  --color-success: oklch(60% 0.15 145);
  --color-error: oklch(55% 0.2 25);
  
  --color-overlay: oklch(0% 0 0 / 0.5);
  
  /* Spacing - Using rem for better accessibility */
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  
  /* Typography */
  --font-size-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --font-size-sm: clamp(0.8125rem, 0.75rem + 0.3vw, 0.875rem);
  --font-size-base: clamp(0.875rem, 0.8rem + 0.375vw, 1rem);
  --font-size-lg: clamp(1rem, 0.9rem + 0.5vw, 1.125rem);
  --font-size-xl: clamp(1.25rem, 1.1rem + 0.75vw, 1.5rem);
  --font-size-2xl: clamp(1.5rem, 1.3rem + 1vw, 2rem);
  
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
  
  /* Border radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px oklch(0% 0 0 / 0.05);
  --shadow-md: 0 4px 6px -1px oklch(0% 0 0 / 0.1), 0 2px 4px -2px oklch(0% 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px oklch(0% 0 0 / 0.1), 0 4px 6px -4px oklch(0% 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px oklch(0% 0 0 / 0.1), 0 8px 10px -6px oklch(0% 0 0 / 0.1);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Layout */
  --container-narrow: min(100%, 37.5rem);
  --container-wide: min(100%, 62.5rem);
  
  /* Z-index scale */
  --z-base: 1;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 1000;
  --z-modal: 1001;

  color-scheme: light;
}

/* Reset & Base */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-inline-size: 100%;
  block-size: auto;
}

button,
input,
select,
textarea {
  font: inherit;
  color: inherit;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  color: var(--color-text);
  background: var(--color-bg);
  padding: var(--space-lg);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Layout */
.page-container {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  margin-inline: auto;
  width: 100%;
}

.page-container--centered {
  max-width: var(--container-narrow);
  text-align: center;
  padding-block: var(--space-2xl);
  padding-inline: var(--space-xl);
}

.page-container--narrow {
  max-width: var(--container-narrow);
}

.page-container--wide {
  max-width: var(--container-wide);
}

.page-container--centered-content {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 0;
}

/* Typography */
.page-title {
  color: var(--color-text);
  margin-block-end: var(--space-md);
  font-weight: var(--font-weight-semibold);
  line-height: var(--line-height-tight);
}

.page-title--large {
  font-size: var(--font-size-2xl);
}

.page-title--medium {
  font-size: var(--font-size-xl);
  margin-block-end: var(--space-xs);
}

.page-subtitle {
  color: var(--color-text-secondary);
  font-size: var(--font-size-sm);
  margin-block-end: var(--space-lg);
}

.page-subtitle--large {
  font-size: var(--font-size-base);
  margin-block-end: var(--space-2xl);
}

/* Links & Navigation */
.nav-links {
  text-align: center;
  margin-block-start: var(--space-lg);
  padding-block-start: var(--space-lg);
  border-block-start: 1px solid var(--color-border);
}

.nav-links--vertical {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
  margin-block-start: 0;
  padding-block-start: 0;
  border-block-start: none;
}

.nav-link {
  color: var(--color-primary);
  text-decoration: none;
  font-size: var(--font-size-sm);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary-hover);
  text-decoration: underline;
}

.nav-link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* Cards */
.card {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
}

.card--link {
  display: block;
  padding: var(--space-lg);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: var(--color-text);
  transition: all var(--transition-base);
}

.card--link:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.card--link:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.card__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  background: var(--color-bg-tertiary);
  display: block;
}

.card__body {
  padding: var(--space-sm) var(--space-md);
}

.card__title {
  font-size: var(--font-size-lg);
  margin-block-end: var(--space-xs);
  color: var(--color-text);
  font-weight: var(--font-weight-medium);
}

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

.card__icon {
  font-size: var(--space-2xl);
  margin-block-end: var(--space-md);
}

.card__filename {
  font-size: var(--font-size-xs);
  color: var(--color-text);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.card__meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-block-start: var(--space-xs);
}

/* Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(min(180px, 100%), 1fr));
  gap: var(--space-lg);
}

/* Forms */
.form-group {
  margin-block-end: var(--space-lg);
}

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin-block-end: var(--space-xs);
  color: var(--color-text);
}

.form-input,
.form-select {
  width: 100%;
  padding-block: var(--space-sm);
  padding-inline: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  background: var(--color-surface);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus-visible,
.form-select:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.1);
}

.form-input--hidden {
  display: none;
}

/* Buttons */
.btn {
  padding-block: var(--space-sm);
  padding-inline: var(--space-lg);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: all var(--transition-base);
  border: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn--primary {
  width: 100%;
  padding-block: var(--space-md);
  padding-inline: var(--space-lg);
  font-size: var(--font-size-base);
  background: var(--color-primary);
  color: var(--color-surface);
  margin-block-end: var(--space-lg);
}

.btn--primary:hover:not(:disabled) {
  background: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn--primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn--primary:disabled {
  background: var(--color-primary-disabled);
  cursor: not-allowed;
  opacity: 0.6;
}

.btn--primary:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn--secondary {
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
}

.btn--secondary:hover:not(:disabled) {
  background: var(--color-surface-hover);
  border-color: var(--color-border-hover);
}

.btn--secondary:disabled {
  background: var(--color-bg-secondary);
  color: var(--color-text-muted);
  cursor: not-allowed;
  opacity: 0.6;
}

.btn--small {
  margin-block-start: var(--space-xs);
  padding-block: var(--space-xs);
  padding-inline: var(--space-md);
  font-size: var(--font-size-xs);
}

.btn--inline {
  flex: 1;
}

/* Drop Zone */
.drop-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  min-height: 12.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  cursor: pointer;
  transition: all var(--transition-base);
  background: var(--color-bg-secondary);
  margin-block-end: var(--space-lg);
}

.drop-zone:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-tertiary);
}

.drop-zone.drop-zone--active {
  border-color: var(--color-primary);
  background: oklch(from var(--color-primary) l c h / 0.1);
}

.drop-zone:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.drop-zone__icon {
  font-size: 3rem;
  margin-block-end: var(--space-md);
  opacity: 0.5;
}

.drop-zone__text {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  text-align: center;
}

.drop-zone__hint {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-block-start: var(--space-xs);
}

/* Preview */
.preview {
  margin-block-end: var(--space-lg);
  padding: var(--space-lg);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-lg);
  display: none;
}

.preview.preview--active {
  display: block;
}

.preview__header {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin-block-end: var(--space-md);
  color: var(--color-text);
}

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

.preview__thumbnail {
  width: 5rem;
  height: 5rem;
  aspect-ratio: 1;
  object-fit: cover;
  border-radius: var(--radius-md);
  background: var(--color-bg-tertiary);
}

.preview__info {
  flex: 1;
  min-width: 0;
}

.preview__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text);
  word-break: break-word;
  overflow-wrap: anywhere;
}

.preview__size {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-block-start: var(--space-xs);
}

/* Progress */
.progress {
  display: none;
  margin-block-end: var(--space-lg);
}

.progress.progress--active {
  display: block;
}

.progress__bar-container {
  width: 100%;
  height: 0.5rem;
  background: var(--color-bg-tertiary);
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-block-end: var(--space-xs);
}

.progress__bar {
  height: 100%;
  background: var(--color-primary);
  width: 0%;
  transition: width var(--transition-slow);
}

.progress__bar.progress__bar--indeterminate {
  animation: indeterminate 1.5s infinite linear;
  background: linear-gradient(
    90deg,
    var(--color-primary) 0%,
    oklch(from var(--color-primary) calc(l + 0.1) c h) 50%,
    var(--color-primary) 100%
  );
  background-size: 200% 100%;
}

@keyframes indeterminate {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Status */
.status {
  margin-block: var(--space-lg) var(--space-lg);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.status-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
  text-align: center;
}

.status-text--success {
  color: var(--color-success);
}

.status-text--error {
  color: var(--color-error);
}

/* Folder */
.folder-path {
  font-size: var(--font-size-xs);
  color: var(--color-text-secondary);
  margin-block-start: var(--space-xs);
  padding: var(--space-xs) var(--space-md);
  background: var(--color-bg-secondary);
  border-radius: var(--radius-md);
  display: none;
}

.folder-path.folder-path--active {
  display: block;
}

.folder-path__label {
  color: var(--color-text-muted);
}

/* Modal */
.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: var(--color-overlay);
  backdrop-filter: blur(4px);
  z-index: var(--z-modal-backdrop);
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.modal-overlay.modal-overlay--active {
  display: flex;
}

.modal {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  padding: var(--space-lg);
  max-width: 25rem;
  width: 100%;
  box-shadow: var(--shadow-xl);
  z-index: var(--z-modal);
  max-height: 90vh;
  overflow-y: auto;
}

.modal__title {
  margin-block-end: var(--space-lg);
  font-size: var(--font-size-lg);
  color: var(--color-text);
  font-weight: var(--font-weight-semibold);
}

.modal__form-group {
  margin-block-end: var(--space-lg);
}

.modal__form-group .form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin-block-end: var(--space-xs);
  color: var(--color-text);
}

.modal__form-group .form-input,
.modal__form-group .form-select {
  width: 100%;
  padding-block: var(--space-sm);
  padding-inline: var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--font-size-sm);
}

.modal__form-group .form-input:focus-visible,
.modal__form-group .form-select:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.1);
}

.modal__error {
  color: var(--color-error);
  font-size: var(--font-size-xs);
  margin-block-start: var(--space-xs);
  display: none;
}

.modal__error.modal__error--active {
  display: block;
}

.modal__actions {
  display: flex;
  gap: var(--space-md);
  margin-block-start: var(--space-lg);
}

/* Empty State */
.empty-state {
  text-align: center;
  padding-block: var(--space-2xl);
  color: var(--color-text-muted);
}

/* Utilities */
.hidden {
  display: none;
}

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

/* Responsive improvements */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

@media (max-width: 48rem) {
  :root {
    --space-xl: 1.5rem;
    --space-2xl: 2rem;
  }
  
  .page-container {
    padding: var(--space-lg);
  }
  
  .page-container--centered {
    padding-block: var(--space-xl);
    padding-inline: var(--space-lg);
  }
  
  .modal {
    max-width: 100%;
    margin: var(--space-md);
  }
}