/* PowerToys 官网 - 微软Fluent Design极简专业风 */
:root {
  --ms-blue: #0078D4;
  --ms-blue-hover: #106EBE;
  --ms-blue-light: #DEECF9;
  --ms-dark: #1B1B1B;
  --ms-gray-100: #F3F3F3;
  --ms-gray-200: #E8E8E8;
  --ms-gray-300: #D1D1D1;
  --ms-gray-500: #616161;
  --ms-gray-700: #323130;
  --ms-white: #FFFFFF;
  --header-height: 64px;
  --border-radius: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
  --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 深色模式 */
[data-theme="dark"] {
  --ms-white: #1B1B1B;
  --ms-dark: #F3F3F3;
  --ms-gray-100: #2D2D2D;
  --ms-gray-200: #383838;
  --ms-gray-300: #484848;
  --ms-gray-500: #A0A0A0;
  --ms-gray-700: #E0E0E0;
  --ms-blue-light: #1E3A5F;
  color-scheme: dark;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Microsoft YaHei", sans-serif;
  background: var(--ms-white);
  color: var(--ms-dark);
  line-height: 1.6;
  min-height: 100vh;
  transition: background 0.3s, color 0.3s;
}

a { text-decoration: none; color: var(--ms-blue); transition: var(--transition); }
a:hover { color: var(--ms-blue-hover); }

/* 公共头部 */
.site-header {
  position: sticky; top: 0; z-index: 100;
  height: var(--header-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--ms-gray-200);
  transition: var(--transition);
}
[data-theme="dark"] .site-header {
  background: rgba(27,27,27,0.95);
}
.header-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 0 24px; height: 100%;
  display: flex; align-items: center; justify-content: space-between;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--ms-dark); }
.logo svg { width: 28px; height: 28px; }
.nav-links { display: flex; align-items: center; gap: 28px; list-style: none; }
.nav-links a { color: var(--ms-gray-700); font-size: 14px; font-weight: 500; position: relative; padding: 4px 0; }
.nav-links a:hover, .nav-links a.active { color: var(--ms-blue); }
.nav-links a.active::after {
  content: ''; position: absolute; bottom: -2px; left: 0; right: 0;
  height: 2px; background: var(--ms-blue); border-radius: 1px;
}
.theme-toggle {
  width: 36px; height: 36px; border: none; border-radius: 50%;
  background: var(--ms-gray-100); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition); color: var(--ms-gray-700);
}
.theme-toggle:hover { background: var(--ms-blue-light); color: var(--ms-blue); }
[data-theme="dark"] .theme-toggle { background: var(--ms-gray-200); }
[data-theme="dark"] .theme-toggle:hover { background: var(--ms-blue-light); }

/* 面包屑 */
.breadcrumb {
  max-width: 1200px; margin: 0 auto;
  padding: 16px 24px; font-size: 13px; color: var(--ms-gray-500);
  display: flex; align-items: center; gap: 6px;
}
.breadcrumb a { color: var(--ms-gray-500); }
.breadcrumb a:hover { color: var(--ms-blue); }
.breadcrumb span { color: var(--ms-dark); font-weight: 500; }

/* 主内容区 */
.main-content { max-width: 1200px; margin: 0 auto; padding: 0 24px 60px; }

/* 公共底部 */
.site-footer {
  border-top: 1px solid var(--ms-gray-200);
  background: var(--ms-gray-100);
  padding: 40px 24px;
  transition: var(--transition);
}
[data-theme="dark"] .site-footer { background: #151515; }
.footer-inner {
  max-width: 1200px; margin: 0 auto;
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 20px;
  font-size: 13px; color: var(--ms-gray-500);
}
.footer-links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer-links a { color: var(--ms-gray-500); }
.footer-links a:hover { color: var(--ms-blue); }

/* 通用按钮 */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px; border-radius: var(--border-radius);
  font-size: 15px; font-weight: 600; cursor: pointer;
  border: none; transition: var(--transition);
}
.btn-primary {
  background: var(--ms-blue); color: #fff;
}
.btn-primary:hover { background: var(--ms-blue-hover); color: #fff; transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn-outline {
  background: transparent; color: var(--ms-blue);
  border: 2px solid var(--ms-blue);
}
.btn-outline:hover { background: var(--ms-blue); color: #fff; }
.btn-sm { padding: 8px 18px; font-size: 13px; }

/* 卡片卡片 */
.card {
  background: var(--ms-white); border: 1px solid var(--ms-gray-200);
  border-radius: var(--border-radius); padding: 24px;
  transition: var(--transition);
}
[data-theme="dark"] .card { background: var(--ms-gray-100); }
.card:hover { border-color: var(--ms-blue); box-shadow: var(--shadow-md); transform: translateY(-2px); }

/* 区块标题 */
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { font-size: 32px; font-weight: 700; color: var(--ms-dark); margin-bottom: 12px; }
.section-title p { font-size: 16px; color: var(--ms-gray-500); max-width: 600px; margin: 0 auto; }

/* 快捷键块 */
.kbd-group { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.kbd {
  display: inline-block; padding: 3px 10px; font-family: "Consolas", "Courier New", monospace;
  font-size: 13px; font-weight: 600; color: var(--ms-gray-700);
  background: var(--ms-gray-100); border: 1px solid var(--ms-gray-300);
  border-radius: 4px; box-shadow: 0 1px 0 var(--ms-gray-300);
}
[data-theme="dark"] .kbd { background: var(--ms-gray-200); border-color: var(--ms-gray-300); }

/* 步骤列表 */
.step-list { counter-reset: step; list-style: none; }
.step-list li {
  counter-increment: step; position: relative;
  padding: 16px 16px 16px 56px; margin-bottom: 12px;
  background: var(--ms-gray-100); border-radius: var(--border-radius);
  border-left: 3px solid var(--ms-blue);
}
.step-list li::before {
  content: counter(step); position: absolute; left: 16px; top: 16px;
  width: 28px; height: 28px; background: var(--ms-blue); color: #fff;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 700;
}
[data-theme="dark"] .step-list li { background: var(--ms-gray-200); }

/* FAQ手风琴 */
.accordion-item { border: 1px solid var(--ms-gray-200); border-radius: var(--border-radius); margin-bottom: 12px; overflow: hidden; }
.accordion-header {
  width: 100%; padding: 18px 20px; text-align: left;
  background: var(--ms-white); border: none; cursor: pointer;
  font-size: 15px; font-weight: 600; color: var(--ms-dark);
  display: flex; align-items: center; justify-content: space-between;
  transition: var(--transition);
}
[data-theme="dark"] .accordion-header { background: var(--ms-gray-100); }
.accordion-header:hover { background: var(--ms-gray-100); }
.accordion-icon { transition: transform 0.3s; color: var(--ms-blue); }
.accordion-item.active .accordion-icon { transform: rotate(180deg); }
.accordion-body {
  max-height: 0; overflow: hidden;
  transition: max-height 0.35s cubic-bezier(0.4, 0, 0.2, 1);
}
.accordion-body-inner { padding: 0 20px 20px; color: var(--ms-gray-500); font-size: 14px; line-height: 1.7; }

/* 呼吸动画 - 二维码边框 */
@keyframes qrBreath {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0, 120, 212, 0.3); transform: scale(1); }
  50% { box-shadow: 0 0 0 6px rgba(0, 120, 212, 0.08); transform: scale(1.02); }
}
.qr-breath {
  animation: qrBreath 2.5s ease-in-out infinite;
  border-radius: 8px;
}

/* 弹窗 */
.modal-overlay {
  position: fixed; inset: 0; z-index: 1000;
  background: rgba(0,0,0,0.5); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  opacity: 0; visibility: hidden; transition: all 0.3s ease;
}
.modal-overlay.open { opacity: 1; visibility: visible; }
.modal-box {
  background: var(--ms-white); border-radius: 16px; padding: 32px;
  max-width: 480px; width: 90%; position: relative;
  transform: translateY(20px) scale(0.95); transition: all 0.3s ease;
  box-shadow: var(--shadow-lg);
}
[data-theme="dark"] .modal-box { background: var(--ms-gray-100); }
.modal-overlay.open .modal-box { transform: translateY(0) scale(1); }
.modal-close {
  position: absolute; top: 12px; right: 16px; width: 32px; height: 32px;
  border: none; background: var(--ms-gray-100); border-radius: 50%;
  cursor: pointer; font-size: 18px; color: var(--ms-gray-500);
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.modal-close:hover { background: var(--ms-gray-200); color: var(--ms-dark); }
.modal-title { font-size: 20px; font-weight: 700; color: var(--ms-dark); margin-bottom: 16px; }
.modal-qr-wrap {
  display: flex; align-items: center; gap: 24px;
  flex-wrap: wrap; justify-content: center;
}
.modal-qr-img {
  width: 150px; height: 150px; padding: 8px; background: #fff;
  border: 2px solid var(--ms-blue); border-radius: 8px;
}
.modal-info { flex: 1; min-width: 200px; }
.modal-info h4 { font-size: 16px; font-weight: 700; color: var(--ms-dark); margin-bottom: 8px; }
.modal-info ul { list-style: none; padding: 0; }
.modal-info li { font-size: 13px; color: var(--ms-gray-500); padding: 4px 0; line-height: 1.6; }
.modal-info li::before { content: '✓ '; color: #22c55e; font-weight: 700; }
.modal-tip {
  margin-top: 16px; padding: 12px 16px; background: #FEF3C7; border-radius: 8px;
  font-size: 13px; color: #92400E; line-height: 1.6;
}
[data-theme="dark"] .modal-tip { background: #422006; color: #FDE68A; }
.modal-tip strong { color: #B45309; }
[data-theme="dark"] .modal-tip strong { color: #FCD34D; }

/* 响应式 */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .section-title h2 { font-size: 24px; }
  .modal-box { padding: 24px 20px; }
  .modal-qr-img { width: 120px; height: 120px; }
}