:root {
  --page-bg: #faf9f7;
  --surface: #ffffff;
  --border: rgba(31, 41, 55, 0.1);
  --border-strong: rgba(31, 41, 55, 0.15);
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
  --shadow-soft: 0 8px 30px rgba(0, 0, 0, 0.1);
  --text-main: #1f2937;
  --text-sub: #6b7280;
  --accent: #22c55e;
  --accent-strong: #16a34a;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --gap-lg: 2rem;
  --gap-md: 1.5rem;
  --gap-sm: 0.75rem;
}

body {
  color: var(--text-main);
  background: var(--page-bg);
}

.navbar {
  background: rgba(255, 255, 255, 0.95) !important;
  backdrop-filter: blur(10px) !important;
  border-bottom: 1px solid var(--border) !important;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06) !important;
  padding: 1rem 0 !important;
  position: sticky !important;
  top: 0 !important;
  z-index: 1000 !important;
}

.nav-container {
  max-width: 1200px !important;
  margin: 0 auto !important;
  padding: 0 2rem !important;
  display: flex !important;
  justify-content: space-between !important;
  align-items: center !important;
  min-height: 64px !important;
}

.nav-links a {
  border-radius: 12px;
  padding: 0.5rem 1rem;
  transition: all 0.2s ease;
}

.nav-links a:hover,
.nav-links a.active {
  background: rgba(31, 41, 55, 0.1);
  color: var(--text-main);
}

.card,
.panel,
.sidebar-section,
.preview-area,
.container.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.tip-box {
  background: rgba(34, 197, 94, 0.08);
  border-left: 4px solid var(--accent);
  border-radius: var(--radius-md);
  box-shadow: 0 4px 12px rgba(34, 197, 94, 0.12);
}

.btn,
.control-btn,
.upload-btn {
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.btn.primary,
.control-btn.primary,
.upload-btn {
  background: linear-gradient(135deg, #1f2937 0%, #374151 100%);
  color: #fff;
  border: none;
}

.btn.secondary {
  background: #f8fafc;
  color: var(--text-main);
  border: 1px solid var(--border);
}

input[type="text"],
input[type="number"],
input[type="range"],
input[type="color"],
textarea,
select {
  border: 1px solid var(--border);
  border-radius: 10px;
}

.tag,
.badge,
.pill {
  border-radius: 999px;
  padding: 0.25rem 0.75rem;
  border: 1px solid var(--border);
  background: #f8fafc;
  color: var(--text-main);
}