:root {
  --md-primary: #00639a;
  --md-primary-strong: #004a74;
  --md-surface: #ffffff;
  --md-surface-alt: #f2f6fb;
  --md-outline: #b8c8d6;
  --md-error: #b3261e;
  --md-on-surface: #1a2530;
  --md-shadow: 0 8px 24px rgba(16, 41, 64, 0.12);
  --radius-lg: 16px;
  --radius-md: 10px;
  --preview-stage-height: clamp(360px, 68vh, 820px);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Segoe UI", "Noto Sans JP", sans-serif;
  background: linear-gradient(160deg, #e5f0ff 0%, #edf8f5 52%, #ffffff 100%);
  color: var(--md-on-surface);
}

.app-shell {
  width: min(1040px, 100%);
  margin: 0 auto;
  padding: 24px;
  display: grid;
  gap: 16px;
}

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

.card {
  background: var(--md-surface);
  border: 1px solid var(--md-outline);
  border-radius: var(--radius-lg);
  box-shadow: var(--md-shadow);
  padding: 20px;
}

.page-header h1 {
  margin: 0 0 8px;
  font-size: 1.35rem;
}

.page-header p {
  margin: 0;
  color: #3d5568;
}

.panel h2 {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.status-banner {
  border-left: 4px solid var(--md-primary);
  background: var(--md-surface-alt);
  border-radius: var(--radius-md);
  padding: 12px 14px;
  font-size: 0.95rem;
}

.status-banner[data-tone="error"] {
  border-left-color: var(--md-error);
  color: var(--md-error);
}

.status-banner[data-tone="success"] {
  border-left-color: #116c32;
  color: #116c32;
}

.form-grid {
  display: grid;
  gap: 10px;
}

label {
  font-size: 0.92rem;
  font-weight: 600;
}

input[type="text"],
input[type="password"],
input[type="file"] {
  width: 100%;
  border: 1px solid var(--md-outline);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  font-size: 0.96rem;
  background: #ffffff;
}

input:focus-visible,
button:focus-visible {
  outline: 2px solid #4f99cc;
  outline-offset: 2px;
}

.hint {
  margin: 8px 0 0;
  font-size: 0.9rem;
  color: #486176;
}

.button-row {
  margin-top: 12px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.button {
  border: 0;
  border-radius: 999px;
  padding: 10px 16px;
  font-size: 0.95rem;
  font-weight: 700;
  cursor: pointer;
}

.button-primary {
  background: var(--md-primary);
  color: #ffffff;
}

.button-primary:hover {
  background: var(--md-primary-strong);
}

.button-text {
  background: transparent;
  color: var(--md-primary);
}

progress {
  width: 100%;
  height: 18px;
  border-radius: 999px;
  overflow: hidden;
}

.result-text {
  margin: 0 0 10px;
  font-weight: 700;
}

.output-box {
  margin: 0;
  border: 1px solid var(--md-outline);
  border-radius: var(--radius-md);
  background: #f7fafc;
  padding: 12px;
  min-height: 110px;
  overflow: auto;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.85rem;
}

.preview-panel {
  margin-top: 14px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 340px);
  gap: 14px;
  width: 100%;
  max-width: none;
  margin-left: 0;
  justify-content: start;
  align-items: start;
}

.preview-column {
  border: 1px solid var(--md-outline);
  border-radius: var(--radius-md);
  background: #f8fbff;
  padding: 10px;
}

.preview-column h3 {
  margin: 0 0 8px;
  font-size: 0.95rem;
}

.page-list-column {
  display: flex;
  flex-direction: column;
}

.overflow-page-list {
  list-style: none;
  margin: 0;
  padding: 0;
  height: var(--preview-stage-height);
  max-height: var(--preview-stage-height);
  overflow: auto;
  display: grid;
  gap: 6px;
}

.canvas-column {
  width: 100%;
  justify-self: end;
}

.overflow-page-item {
  width: 100%;
  text-align: left;
  border: 1px solid #b6c8da;
  border-radius: 8px;
  background: #ffffff;
  padding: 8px;
  cursor: pointer;
  font-size: 0.88rem;
}

.overflow-page-item:hover {
  border-color: var(--md-primary);
}

.overflow-page-item[data-active="true"] {
  border-width: 2px;
  border-color: var(--md-primary);
  background: #e7f1fb;
}

.pdf-preview-stage {
  border: 1px solid #b6c8da;
  border-radius: var(--radius-md);
  background: #ffffff;
  padding: 10px;
  height: var(--preview-stage-height);
  width: 100%;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

#pdf-preview-canvas {
  display: block;
  margin: 0;
}

.error-text {
  margin: 0;
  color: var(--md-error);
  font-weight: 700;
}

[hidden] {
  display: none !important;
}

@media (min-width: 900px) {
  .workflow-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
  }

  .page-header,
  #status-banner {
    grid-column: 1 / -1;
  }

  #panel-login {
    grid-column: 1 / -1;
    max-width: 560px;
    justify-self: center;
    width: 100%;
  }

  #panel-upload,
  #panel-progress,
  #panel-result,
  #panel-error {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .app-shell {
    padding: 14px;
  }

  .card {
    padding: 16px;
  }

  .button-row {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .preview-panel {
    grid-template-columns: 1fr;
    margin-left: 0;
  }

  .canvas-column {
    width: 100%;
    justify-self: stretch;
  }
}