:root {
  --bg: #fdf2f8;
  --bg-deep: #fce7f3;
  --surface: #fffbfc;
  --text: #4a2c3d;
  --muted: #9d6b82;
  --primary: #ec4899;
  --primary-hover: #db2777;
  --primary-soft: rgba(236, 72, 153, 0.12);
  --border: #f5cfe0;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(190, 80, 130, 0.12);
  --font: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --page-width: 1320px;
  --preview-width: 1240px;
  --input-bg: #fff5f9;
  --preview-bg-white: #ffffff;
  --preview-bg-gray: #e8e8e8;
  --preview-bg-black: #1a1a1a;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  background: linear-gradient(165deg, #fff5f9 0%, var(--bg) 45%, var(--bg-deep) 100%);
  color: var(--text);
  line-height: 1.6;
}

.page {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
}

.result-panel.panel {
  max-width: 100%;
}

.header {
  text-align: center;
  margin-bottom: 2rem;
}

.header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #be185d;
}

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

.panel {
  background: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
}

.field {
  margin-bottom: 1.25rem;
}

.field label,
.label-text {
  display: block;
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 0.9rem;
}

.field input[type="url"] {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--input-bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 1rem;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.field input[type="url"]::placeholder {
  color: #c4a0b0;
}

.field input[type="url"]:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-soft);
}

.field.row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
}

.field.row .label-text {
  margin-bottom: 0;
}

.mode-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.mode-opt {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  font-size: 0.9rem;
}

.mode-opt input {
  accent-color: var(--primary);
}

.bg-options {
  display: flex;
  gap: 1rem;
}

.bg-opt {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
  font-size: 0.9rem;
  user-select: none;
}

.bg-opt input {
  accent-color: var(--primary);
}

.swatch {
  width: 20px;
  height: 20px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.swatch-white { background: var(--preview-bg-white); }
.swatch-gray { background: var(--preview-bg-gray); }
.swatch-black { background: var(--preview-bg-black); }

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  max-width: 200px;
  padding: 0.75rem 1.5rem;
  background: var(--primary);
  color: #fff;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.15s, transform 0.1s;
}

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

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

.toolbar-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.btn-secondary {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: #fce7f3;
  color: #9d174d;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
  text-decoration: none;
  font-weight: 500;
  transition: background 0.15s, border-color 0.15s;
  cursor: pointer;
  font-family: inherit;
}

button.btn-secondary:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn-secondary:hover:not(:disabled) {
  background: #fbcfe8;
  border-color: #f9a8d4;
}

.spinner {
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255, 255, 255, 0.35);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.spinner.hidden,
.hidden {
  display: none !important;
}

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

.error {
  margin: 1rem 0 0;
  padding: 0.75rem 1rem;
  background: #fff1f2;
  color: #be123c;
  border: 1px solid #fecdd3;
  border-radius: 8px;
  font-size: 0.9rem;
}

.result-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.result-toolbar h2 {
  margin: 0;
  font-size: 1.15rem;
}

.result-panel {
  overflow: visible;
}

.combined-wrap {
  margin-top: 1.5rem;
  text-align: center;
  border-radius: 8px;
  overflow: hidden;
  background: #fdf2f8;
  border: 1px dashed var(--border);
  padding: 1rem;
}

.combined-wrap img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  box-shadow: var(--shadow);
}

.preview-hint {
  margin: 0 0 1rem;
  padding: 0.75rem 1rem;
  background: #fce7f3;
  color: #9d174d;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.875rem;
}

.help-panel h3 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
}

.help-panel ul {
  margin: 0;
  padding-left: 1.25rem;
  color: var(--muted);
  font-size: 0.9rem;
}

.help-panel li {
  margin-bottom: 0.4rem;
}

.footer {
  text-align: center;
  color: var(--muted);
  font-size: 0.85rem;
}

.footer a {
  color: var(--primary);
}

@media (max-width: 600px) {
  .page {
    padding: 1.25rem 1rem 2rem;
  }

  .btn-primary {
    max-width: none;
    width: 100%;
  }
}