:root {
  --color-primary: #2563eb;
  --color-primary-hover: #1d4ed8;
  --color-bg: #f8fafc;
  --color-panel: #ffffff;
  --color-text-main: #0f172a;
  --color-text-muted: #64748b;
  --color-border: #e2e8f0;
  --radius: 6px;
}

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

body {
  font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
  background-color: var(--color-bg);
  color: var(--color-text-main);
  line-height: 1.6;
  padding: 2rem 1rem;
}

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

.app-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.app-header h1 {
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.app-header p {
  color: var(--color-text-muted);
  font-size: 0.875rem;
  margin-top: 0.25rem;
}

.main-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

@media (min-width: 768px) {
  .main-layout {
    grid-template-columns: 1fr 1.2fr;
  }
}

.panel {
  background: var(--color-panel);
  padding: 2rem;
  border-radius: var(--radius);
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
}

.panel-title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.form-group {
  margin-bottom: 1.5rem;
}

label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  margin-bottom: 0.5rem;
  color: var(--color-text-main);
}

textarea, select {
  width: 100%;
  padding: 0.75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  transition: border-color 0.2s;
  background-color: #fff;
}

textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

.primary-btn {
  width: 100%;
  background-color: var(--color-primary);
  color: #fff;
  border: none;
  padding: 0.875rem;
  font-size: 1rem;
  font-weight: 500;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background-color 0.2s;
  margin-top: auto;
}

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

.primary-btn:disabled {
  background-color: #94a3b8;
  cursor: not-allowed;
}

.status-msg {
  margin-top: 1rem;
  font-size: 0.875rem;
  text-align: center;
  color: var(--color-text-muted);
  min-height: 1.5rem;
}

.svg-container {
  flex-grow: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 300px;
  background-color: #f1f5f9;
  border-radius: var(--radius);
  border: 1px dashed var(--color-border);
  overflow: hidden;
}

.placeholder-text {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

/* 追加要素のスタイル */
.hidden {
  display: none !important;
}

.file-input {
  width: 100%;
  padding: 0.5rem;
  border: 1px dashed var(--color-border);
  border-radius: var(--radius);
  background-color: #f8fafc;
  font-size: 0.875rem;
  cursor: pointer;
}

.file-input::file-selector-button {
  background-color: #e2e8f0;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  margin-right: 1rem;
  cursor: pointer;
  color: var(--color-text-main);
  transition: background-color 0.2s;
}

.file-input::file-selector-button:hover {
  background-color: #cbd5e1;
}