:root {
  --color-bg: #f5f6f8;
  --color-panel: #ffffff;
  --color-border: #e2e5ea;
  --color-text: #1c2230;
  --color-text-muted: #5c6472;
  --color-primary: #2d5bff;
  --color-primary-dark: #1f43cc;
  --color-danger: #d64545;
  --color-danger-bg: #fdecec;
  --color-success: #1f9d55;
  --radius: 10px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
}

.app-shell {
  max-width: 1200px;
  margin: 0 auto;
  padding: 24px 20px 60px;
}

.app-header {
  margin-bottom: 24px;
}

.app-header h1 {
  font-size: 1.6rem;
  margin: 0 0 6px;
}

.app-subtitle {
  color: var(--color-text-muted);
  margin: 0;
  font-size: 0.95rem;
}

.app-main {
  display: grid;
  grid-template-columns: minmax(320px, 420px) 1fr;
  gap: 20px;
  align-items: start;
}

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

.panel {
  background: var(--color-panel);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 20px;
}

.panel h2 {
  font-size: 1.05rem;
  margin: 0 0 4px;
}

.hint {
  color: var(--color-text-muted);
  font-size: 0.85rem;
  margin: 0 0 16px;
}

.field {
  margin-bottom: 14px;
}

.field label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.field input,
.field select {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  font-size: 0.95rem;
  background: #fff;
  color: var(--color-text);
}

.field input:focus,
.field select:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 1px;
}

.field input.has-error,
.field select.has-error {
  border-color: var(--color-danger);
}

.field-error {
  color: var(--color-danger);
  font-size: 0.8rem;
  margin: 4px 0 0;
}

.section-divider {
  display: flex;
  align-items: center;
  margin: 20px 0 14px;
  color: var(--color-text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.section-divider::before,
.section-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--color-border);
}

.section-divider span {
  padding: 0 10px;
}

.form-actions {
  margin-top: 18px;
  display: flex;
  gap: 10px;
}

.btn {
  border: none;
  border-radius: 8px;
  padding: 9px 16px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s ease, opacity 0.15s ease;
}

.btn-secondary {
  background: #eceff3;
  color: var(--color-text);
}

.btn-secondary:hover {
  background: #dfe3e9;
}

.btn-copy {
  background: var(--color-primary);
  color: #fff;
  padding: 6px 12px;
  font-size: 0.8rem;
}

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

.btn-copy:disabled {
  background: #b7c2e0;
  cursor: not-allowed;
}

.btn-copy.copied {
  background: var(--color-success);
}

.validation-banner {
  background: var(--color-danger-bg);
  color: var(--color-danger);
  border-radius: 8px;
  padding: 10px 14px;
  font-size: 0.85rem;
  margin: 0 0 16px;
}

.outputs.is-disabled .output-value {
  color: var(--color-text-muted);
}

.output-block {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 12px 14px;
  margin-bottom: 14px;
  background: #fafbfc;
}

.output-block-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 8px;
}

.output-block-header h3 {
  font-size: 0.85rem;
  margin: 0;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.output-value {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  font-size: 0.88rem;
  word-break: break-all;
  margin: 0;
}

.output-url {
  color: #14406b;
}

.tips-section {
  margin-top: 24px;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}

.accordion-item {
  border: 1px solid var(--color-border);
  border-radius: 8px;
  margin-bottom: 8px;
  overflow: hidden;
}

.accordion-trigger {
  width: 100%;
  background: #fafbfc;
  border: none;
  text-align: left;
  padding: 10px 14px;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.accordion-trigger:hover {
  background: #f0f2f5;
}

.chevron {
  transition: transform 0.15s ease;
  color: var(--color-text-muted);
}

.accordion-trigger[aria-expanded="true"] .chevron {
  transform: rotate(180deg);
}

.accordion-panel {
  padding: 12px 14px;
  font-size: 0.87rem;
  color: var(--color-text-muted);
  background: #fff;
}

.glossary-code {
  font-family: Consolas, Menlo, monospace;
  color: var(--color-primary-dark);
  font-weight: 700;
}

.app-footer {
  margin-top: 30px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: 0.8rem;
}

@media (max-width: 480px) {
  .app-shell {
    padding: 16px 12px 40px;
  }
  .panel {
    padding: 16px;
  }
}