:root {
  --bg: #ffffff;
  --surface: #ffffff;
  --surface-muted: #f3f5f7;
  --text: #1a1a1a;
  --text-muted: #6b7280;
  --text-light: #9ca3af;
  --teal: #1a5653;
  --teal-hover: #134542;
  --teal-light: #e8f4f3;
  --teal-icon: #2d7a76;
  --border: #e5e7eb;
  --border-dashed: #d1d5db;
  --danger: #ef4444;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
  --panel-min-height: 420px;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Inter", system-ui, sans-serif;
  min-height: 100vh;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 48px 24px 40px;
}


/* Hero */

.hero {
  text-align: center;
  margin-bottom: 40px;
}

.hero h1 {
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
}

.hero-line2 {
  display: block;
  margin-top: 2px;
}

.hero-to {
  color: var(--text);
  font-weight: 700;
}

.hero-accent {
  color: var(--teal-icon);
  font-weight: 700;
}

.hero-subtitle {
  margin-top: 14px;
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 520px;
  margin-left: auto;
  margin-right: auto;
}


/* Two equal panels */

.workspace {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  align-items: stretch;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  min-height: 520px;
}

.panel-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 18px 20px 14px;
  border-bottom: 1px solid var(--border);
}

.panel-header h2 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--teal);
  flex: 1;
}

.panel-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  color: var(--teal-icon);
}

.panel-icon svg {
  width: 22px;
  height: 22px;
}

.header-actions {
  display: flex;
  gap: 8px;
  margin-left: auto;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--teal-icon);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s;
}

.icon-btn svg {
  width: 16px;
  height: 16px;
}

.icon-btn:hover {
  background: var(--teal-light);
  border-color: var(--teal-icon);
}

.icon-btn.active {
  background: var(--teal-light);
  border-color: var(--teal);
  color: var(--teal);
}

.panel-body {
  flex: 1;
  padding: 16px 20px;
  display: flex;
  flex-direction: column;
  min-height: var(--panel-min-height);
}

.panel-footer {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 12px;
  padding: 0 20px 20px;
}


/* Upload empty state */

.upload-empty,
.upload-preview {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.drop-zone {
  flex: 1;
  border: 2px dashed var(--border-dashed);
  border-radius: 12px;
  background: var(--surface-muted);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 32px 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--teal-icon);
  background: var(--teal-light);
}

.drop-icon-wrap {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--teal-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: var(--teal-icon);
}

.drop-icon-wrap svg {
  width: 32px;
  height: 32px;
}

.drop-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 4px;
}

.drop-subtitle {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.drop-hint {
  margin-top: 16px;
  font-size: 0.78rem;
  color: var(--text-light);
  line-height: 1.5;
}


/* Preview state */

.preview-frame {
  flex: 1;
  position: relative;
  background: var(--surface-muted);
  border-radius: 12px;
  padding: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--panel-min-height);
}

.preview-frame img {
  max-width: 100%;
  max-height: 100%;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.remove-btn {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 28px;
  height: 28px;
  border: none;
  border-radius: 50%;
  background: var(--danger);
  color: #fff;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  transition: transform 0.15s;
}

.remove-btn:hover {
  transform: scale(1.08);
}


/* Buttons */

.btn {
  border: none;
  border-radius: 10px;
  padding: 12px 18px;
  font-family: inherit;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  transition: background 0.2s, opacity 0.2s;
}

.btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.btn-choose {
  background: var(--teal);
  color: #fff;
  padding: 10px 22px;
}

.btn-choose svg {
  width: 16px;
  height: 16px;
}

.btn-choose:hover {
  background: var(--teal-hover);
}

.btn-secondary {
  background: #e8edf0;
  color: var(--text);
}

.btn-secondary:hover:not(:disabled) {
  background: #dde3e8;
}

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

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

.btn-primary.processing {
  background: #3d5a58;
}

.btn-primary.success {
  background: var(--teal);
  opacity: 1;
}

.btn-icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-icon.hidden {
  display: none;
}


/* Output panel states */

.output-empty,
.output-processing {
  flex: 1;
  background: var(--surface-muted);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: var(--panel-min-height);
}

.output-empty p {
  color: var(--text-light);
  font-size: 0.9rem;
  text-align: center;
  padding: 0 24px;
  line-height: 1.6;
}

.processing-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.processing-inner p {
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.output-text {
  flex: 1;
  width: 100%;
  min-height: var(--panel-min-height);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 16px;
  font-family: inherit;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--surface);
  resize: none;
  outline: none;
}

.output-text:focus {
  border-color: var(--teal-icon);
  box-shadow: 0 0 0 3px rgba(45, 122, 118, 0.12);
}

.output-text[readonly] {
  background: var(--surface);
}


/* Spinners */

.spinner {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid rgba(45, 122, 118, 0.2);
  border-top-color: var(--teal-icon);
  animation: spin 0.8s linear infinite;
  flex-shrink: 0;
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 3px;
}

.btn-primary .spinner {
  border-color: rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
}

.status-message {
  text-align: center;
  min-height: 24px;
  margin-top: 20px;
  font-size: 0.875rem;
  color: var(--text-muted);
}

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

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

.hidden {
  display: none !important;
}

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

@media (max-width: 900px) {
  .workspace {
    grid-template-columns: 1fr;
  }

  .panel {
    min-height: auto;
  }

  .panel-body,
  .preview-frame,
  .output-empty,
  .output-processing,
  .output-text {
    min-height: 320px;
  }
}

@media (max-width: 520px) {
  .page {
    padding: 28px 16px 32px;
  }

  .panel-footer {
    grid-template-columns: 1fr;
  }

  .panel-header {
    flex-wrap: wrap;
  }

  .header-actions {
    width: 100%;
    justify-content: flex-end;
    margin-top: 4px;
  }
}