/* =========================================================
   Image Compressor – styles
   ========================================================= */

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

:root {
  --color-bg:          #f5f7fa;
  --color-surface:     #ffffff;
  --color-border:      #d1d9e0;
  --color-border-focus:#4a90e2;
  --color-primary:     #4a90e2;
  --color-primary-hover:#2f74c8;
  --color-ghost:       #6b7280;
  --color-ghost-hover: #374151;
  --color-error-bg:    #fff0f0;
  --color-error-border:#f87171;
  --color-error-text:  #b91c1c;
  --color-success:     #16a34a;
  --color-text:        #1f2937;
  --color-text-muted:  #6b7280;
  --color-drop-active: #eff6ff;
  --radius:            8px;
  --shadow:            0 1px 4px rgba(0,0,0,.08);
  --transition:        0.18s ease;
}

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  min-height: 100vh;
}

/* ── Layout ───────────────────────────────────────────── */
.container {
  max-width: 860px;
  margin: 0 auto;
  padding: 2rem 1rem 4rem;
}

h1 {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.25rem;
}

.subtitle {
  color: var(--color-text-muted);
  margin-bottom: 1.75rem;
}

h2 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

/* ── Utility ──────────────────────────────────────────── */
.hidden {
  display: none !important;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ── Buttons ──────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.5rem 1.1rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: background var(--transition), color var(--transition), border-color var(--transition), opacity var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}

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

.btn--primary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--secondary:hover {
  background: var(--color-drop-active);
}

.btn--ghost {
  background: transparent;
  color: var(--color-ghost);
  border-color: var(--color-border);
}

.btn--ghost:hover {
  color: var(--color-ghost-hover);
  border-color: var(--color-ghost-hover);
}

.btn--copy {
  background: var(--color-surface);
  color: var(--color-primary);
  border-color: var(--color-primary);
  font-size: 0.82rem;
  padding: 0.35rem 0.85rem;
  margin-top: 0.5rem;
}

.btn--copy:hover {
  background: var(--color-drop-active);
}

/* ── Error banner ─────────────────────────────────────── */
.error-banner {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  background: var(--color-error-bg);
  border: 1px solid var(--color-error-border);
  border-radius: var(--radius);
  color: var(--color-error-text);
  padding: 0.75rem 1rem;
  margin-bottom: 1.25rem;
  font-size: 0.9rem;
}

.error-banner #error-message {
  flex: 1;
}

.error-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-error-text);
  font-size: 1rem;
  line-height: 1;
  padding: 0;
  flex-shrink: 0;
}

.error-close:hover {
  opacity: 0.7;
}

/* ── Drop zone ────────────────────────────────────────── */
.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 2.5rem 1.5rem;
  border: 2px dashed var(--color-border);
  border-radius: var(--radius);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  text-align: center;
  outline: none;
}

.drop-zone:hover,
.drop-zone:focus-visible {
  border-color: var(--color-border-focus);
  background: var(--color-drop-active);
}

/* Active state when dragging files over the zone */
.drop-zone--active {
  border-color: var(--color-primary);
  background: var(--color-drop-active);
  box-shadow: 0 0 0 3px rgba(74,144,226,.2);
}

.drop-zone__icon {
  font-size: 2.5rem;
  line-height: 1;
}

.drop-zone__text {
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text);
}

.drop-zone__hint {
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

/* ── File list section ────────────────────────────────── */
.file-list-section {
  margin-top: 1.5rem;
}

.file-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.file-list__item {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 0.65rem 0.85rem;
  box-shadow: var(--shadow);
}

.file-list__thumb {
  width: 52px;
  height: 52px;
  object-fit: cover;
  border-radius: 4px;
  flex-shrink: 0;
  border: 1px solid var(--color-border);
  background: var(--color-bg);
}

.file-list__info {
  flex: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.85rem;
  min-width: 0;
}

.file-list__name {
  font-size: 0.9rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 220px;
}

.file-list__size {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.file-list__target-label {
  font-size: 0.82rem;
  color: var(--color-text-muted);
  white-space: nowrap;
}

.file-list__target-input {
  width: 90px;
  padding: 0.3rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  font-size: 0.85rem;
  color: var(--color-text);
  background: var(--color-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.file-list__target-input:focus {
  outline: none;
  border-color: var(--color-border-focus);
  box-shadow: 0 0 0 2px rgba(74,144,226,.2);
}

.file-list__target-input:invalid {
  border-color: var(--color-error-border);
}

.file-list__remove {
  flex-shrink: 0;
  padding: 0.3rem 0.55rem;
  font-size: 0.8rem;
}

/* ── Form actions ─────────────────────────────────────── */
.form-actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1.25rem;
  flex-wrap: wrap;
}

/* ── Loading spinner ──────────────────────────────────── */
.loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  padding: 2rem 0;
  color: var(--color-text-muted);
  font-size: 0.9rem;
}

.spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

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

/* ── Results section ──────────────────────────────────── */
.results-section {
  margin-top: 2.5rem;
}

.results-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}

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

.result-card__preview {
  width: 100%;
  max-height: 200px;
  object-fit: contain;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  display: block;
}

.result-card__info {
  padding: 0.9rem 1rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.result-card__filename {
  font-size: 0.88rem;
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  color: var(--color-text);
}

/* Metrics definition list */
.result-card__metrics {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.2rem 0.75rem;
  font-size: 0.82rem;
}

.result-card__metrics dt {
  color: var(--color-text-muted);
  font-weight: 500;
  white-space: nowrap;
}

.result-card__metrics dd {
  color: var(--color-text);
  font-weight: 400;
}

/* Error card variant */
.result-card--error {
  border-color: var(--color-error-border);
  background: var(--color-error-bg);
}

.result-card--error .result-card__filename {
  color: var(--color-error-text);
}

.result-card__error {
  font-size: 0.85rem;
  color: var(--color-error-text);
  padding: 0.5rem 1rem 1rem;
}

/* ── Copy notice ──────────────────────────────────────── */
.copy-notice {
  font-size: 0.8rem;
  color: var(--color-success);
  font-weight: 500;
  margin-top: 0.15rem;
}

/* ── Responsive – tablet ──────────────────────────────── */
@media (max-width: 640px) {
  h1 {
    font-size: 1.4rem;
  }

  .drop-zone {
    padding: 1.75rem 1rem;
  }

  .drop-zone__icon {
    font-size: 2rem;
  }

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

  .file-list__name {
    max-width: 140px;
  }

  .file-list__info {
    gap: 0.3rem 0.5rem;
  }

  .form-actions {
    flex-direction: column;
  }

  .form-actions .btn {
    width: 100%;
  }
}

/* ── Responsive – small mobile ────────────────────────── */
@media (max-width: 400px) {
  .container {
    padding: 1.25rem 0.75rem 3rem;
  }

  .file-list__item {
    flex-wrap: wrap;
  }

  .file-list__thumb {
    width: 44px;
    height: 44px;
  }

  .file-list__target-input {
    width: 80px;
  }
}