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

:root {
  --bg: #0f1220;
  --panel: #1a1f35;
  --panel-2: #232a47;
  --text: #e8ecff;
  --muted: #9aa3c7;
  --primary: #7c5cff;
  --primary-hover: #6a4bee;
  --border: #2c3457;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", sans-serif;
  background: radial-gradient(circle at top, #1b2140 0%, var(--bg) 60%);
  color: var(--text);
  min-height: 100vh;
  padding: 24px 16px;
}

.app {
  max-width: 1100px;
  margin: 0 auto;
}

.header {
  text-align: center;
  margin-bottom: 24px;
}

.header h1 {
  font-size: 28px;
  margin-bottom: 6px;
}

.subtitle {
  color: var(--muted);
  font-size: 14px;
}

.main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

@media (max-width: 860px) {
  .main {
    grid-template-columns: 1fr;
  }
}

.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 20px;
}

.field {
  display: block;
  margin-bottom: 14px;
}

.field-label {
  display: block;
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 6px;
}

textarea,
select {
  width: 100%;
  background: var(--panel-2);
  border: 1px solid var(--border);
  border-radius: 10px;
  color: var(--text);
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.2s;
}

textarea:focus,
select:focus {
  border-color: var(--primary);
}

textarea {
  resize: vertical;
}

.row {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 10px;
}

@media (max-width: 520px) {
  .row {
    grid-template-columns: 1fr;
  }
}

.btn-primary {
  width: 100%;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 10px;
  padding: 12px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
}

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

.btn-primary:active:not(:disabled) {
  transform: scale(0.99);
}

.btn-primary:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.btn-secondary {
  display: inline-block;
  background: var(--panel-2);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  transition: background 0.2s;
}

.btn-secondary:hover {
  background: #2c3560;
}

.status {
  margin-top: 10px;
  font-size: 13px;
  color: var(--muted);
  min-height: 18px;
}

.status.error {
  color: #ff7b7b;
}

.preview-panel {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 380px;
}

.placeholder {
  text-align: center;
  color: var(--muted);
}

.placeholder-icon {
  font-size: 48px;
  margin-bottom: 10px;
}

.result-image {
  max-width: 100%;
  border-radius: 12px;
  border: 1px solid var(--border);
  display: block;
}

.actions {
  margin-top: 16px;
}

.hidden {
  display: none !important;
}

.footer {
  text-align: center;
  color: var(--muted);
  font-size: 12px;
  margin-top: 24px;
}