/**
 * Fallback CSS - 当 Tailwind CDN 无法加载时使用
 */

/* ========== 基础变量 ========== */
:root {
  --primary: #007AFF;
  --background-light: #F2F2F7;
  --surface-light: #FFFFFF;
  --panel-light: #F9F9FB;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
}

/* ========== 布局 ========== */
body {
  margin: 0;
  background: var(--background-light);
  color: var(--gray-900);
  overflow: hidden;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Header */
header {
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border-bottom: 1px solid var(--gray-200);
  background: rgba(255,255,255,0.8);
  backdrop-filter: blur(12px);
  flex-shrink: 0;
}

header .flex { display: flex; align-items: center; }
header .gap-1 { gap: 4px; }
header .gap-2 { gap: 8px; }
header .gap-3 { gap: 12px; }

/* Logo */
header .w-8 { width: 32px; height: 32px; border-radius: 8px; background: black; color: white; display: flex; align-items: center; justify-content: center; }
header h1 { font-size: 13px; font-weight: 600; margin: 0; }

/* Buttons */
button {
  cursor: pointer;
  border: none;
  background: none;
  font-family: inherit;
}

.h-7 { height: 28px; width: 28px; }
.h-8 { height: 32px; padding: 0 16px; }
.rounded-md { border-radius: 6px; }
.rounded-full { border-radius: 9999px; }

header button.rounded-md {
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
}
header button.rounded-md:hover { background: var(--gray-100); }

header button.bg-gray-100 {
  background: var(--gray-100);
  color: var(--gray-700);
  font-size: 11px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}

header button.bg-white {
  background: white;
  border: 1px solid var(--gray-200);
  color: var(--gray-900);
  font-size: 11px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}

header button.bg-slate-900 {
  background: var(--gray-900);
  color: white;
  font-size: 11px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

/* Main Layout */
.flex-1 { flex: 1; }
.overflow-hidden { overflow: hidden; }

body > div {
  display: flex;
  flex: 1;
  overflow: hidden;
}

/* Sidebar */
aside {
  width: 300px;
  background: var(--panel-light);
  border-right: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  flex-shrink: 0;
}

aside > div { padding: 20px; }
aside h2 {
  font-size: 10px;
  font-weight: 700;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 0 0 12px 4px;
}

/* Layout Cards Grid */
.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.gap-3 { gap: 12px; }

.layout-card {
  aspect-ratio: 4/3;
  border-radius: 16px;
  background: white;
  border: 1px solid var(--gray-200);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
}
.layout-card:hover {
  box-shadow: 0 4px 6px rgba(0,0,0,0.1);
  border-color: var(--gray-300);
}
.layout-card span:last-child {
  margin-top: 8px;
  font-size: 10px;
  font-weight: 500;
  color: var(--gray-500);
}

/* Properties Panel */
aside > div:last-child {
  margin-top: auto;
  border-top: 1px solid var(--gray-200);
  background: rgba(255,255,255,0.8);
}

.space-y-4 > * + * { margin-top: 16px; }
.space-y-8 > * + * { margin-top: 32px; }

aside .flex.items-center.justify-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

aside input[type="range"] {
  width: 80px;
  height: 4px;
  accent-color: black;
}

aside .text-\[11px\] { font-size: 11px; font-weight: 500; color: var(--gray-500); }
aside .text-\[10px\] { font-size: 10px; font-family: monospace; color: var(--gray-400); }

/* Toggle */
aside button.w-9 {
  width: 36px;
  height: 20px;
  border-radius: 10px;
  background: black;
  position: relative;
}
aside button.w-9 span {
  width: 16px;
  height: 16px;
  background: white;
  border-radius: 50%;
  position: absolute;
  top: 2px;
  left: 2px;
  transition: transform 0.2s;
}
aside button.w-9 span.translate-x-4 { transform: translateX(16px); }

/* Main Canvas Area - 浅灰色背景 */
main {
  flex: 1;
  background: #c8c8c8;  /* 浅灰色背景 */
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: 32px;
  overflow: hidden;
}

/* Dot Pattern */
main > div:first-child {
  position: absolute;
  inset: 0;
  opacity: 0.08;
  background-image: radial-gradient(rgba(255,255,255,0.8) 1px, transparent 1px);
  background-size: 20px 20px;
}

/* Canvas - 白色画板 */
[data-canvas-root] {
  position: relative;
  width: 800px;
  min-width: 600px;
  min-height: 400px;
  background: #ffffff;
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.12);
  display: inline-flex;
  flex-direction: column;
  z-index: 10;
  border: none;
}

[data-canvas-content] {
  flex: 1;
  padding: 16px;
  display: flex;
  flex-direction: column;
}

/* Zoom Controls */
main > div:last-child {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.7);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255,255,255,0.5);
  border-radius: 9999px;
  padding: 6px;
  display: flex;
  align-items: center;
  gap: 4px;
  z-index: 20;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
}

main > div:last-child button {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-500);
}
main > div:last-child button:hover {
  background: white;
  color: black;
}

main > div:last-child span {
  font-size: 11px;
  font-weight: 600;
  color: var(--gray-700);
  width: 36px;
  text-align: center;
}

/* Toast Container */
#toast-container {
  position: fixed;
  bottom: 16px;
  right: 16px;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

/* Utility Classes */
.w-full { width: 100%; }
.h-full { height: 100%; }
.text-gray-400 { color: var(--gray-400); }
.text-sm { font-size: 14px; }
.mx-1, .mx-2 { margin: 0 4px; }
.h-4.w-px { height: 16px; width: 1px; background: var(--gray-200); }
.material-symbols-outlined { font-size: 18px; }