/* 公共样式文件 - 用于index.html和download.html */

/* CSS变量定义 */
:root{
  --bg-start:#0f1020; --bg-end:#171836;
  --text:#e9ecf2; --muted:#aeb6c7;
  --brand1:#7a5cff; --brand2:#ff5f9a; --brand3:#ff89f3;
  --card-bg:rgba(255,255,255,.04); --card-bd:rgba(255,255,255,.08);
  --shadow:none;
}

/* 基础样式重置 */
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{font-family: -apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial; color:var(--text); background:linear-gradient(180deg,var(--bg-start),var(--bg-end));}

/* 统一滚动条样式 */
html{scrollbar-width: thin; scrollbar-color: rgba(255,255,255,.25) transparent}
*{scrollbar-width: thin}
*::-webkit-scrollbar{width:8px;height:8px}
*::-webkit-scrollbar-thumb{background:rgba(255,255,255,.18);border-radius:8px}
*::-webkit-scrollbar-track{background:transparent}

a{color:inherit;text-decoration:none}

/* 容器样式 */
.container{max-width:1120px;margin:0 auto;padding:0 20px}

/* Header 样式 */
header{position:sticky;top:0;z-index:50;background:rgba(15,16,32,.6);backdrop-filter:blur(8px);border-bottom:1px solid rgba(255,255,255,.08)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px;position:relative}
.nav-left{display:flex;align-items:center;gap:12px}
.logo{display:flex;align-items:center;gap:8px}
.logo img{height:75px;width:auto}
.nav-links{display:flex;gap:18px}
.nav-links a{color:#dfe4ee;opacity:.92}
.nav-right{display:flex;gap:10px}

/* 按钮样式 */
.btn{display:inline-flex;align-items:center;justify-content:center;padding:0 22px;height:44px;border-radius:12px;border:1px solid rgba(255,255,255,.18);font-weight:700;letter-spacing:.2px;transition:.25s ease}
.btn-primary{color:#fff;background:linear-gradient(135deg,var(--brand3),var(--brand2) 45%,var(--brand1))}
.btn-primary:hover{transform:none;filter:saturate(1.02) brightness(1.02)}
.btn-ghost{color:#fff;background:transparent}
.btn-ghost:hover{background:rgba(255,255,255,.06)}

/* 移动端菜单 */
.menu-toggle{display:none;align-items:center;justify-content:center;width:48px;height:48px;border:2px solid rgba(255,255,255,.35);border-radius:12px;background:rgba(255,255,255,.12);color:#fff;cursor:pointer;font-size:18px;font-weight:bold;box-shadow:0 4px 12px rgba(0,0,0,.15);transition:all 0.2s ease}
.menu-toggle:hover{background:rgba(255,255,255,.2);border-color:rgba(255,255,255,.5);transform:translateY(-1px);box-shadow:0 6px 16px rgba(0,0,0,.2)}
.menu-toggle:active{transform:translateY(0);box-shadow:0 2px 8px rgba(0,0,0,.15)}
.mobile-menu{display:none;position:absolute;top:64px;right:0;min-width:220px;background:rgba(23,24,54,.96);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.12);border-radius:12px;padding:10px;z-index:100}
.mobile-menu a{display:block;padding:10px 12px;border-radius:8px;color:#e9ecf2}
.mobile-menu a:hover{background:rgba(255,255,255,.08)}
.mobile-menu hr{border:none;border-top:1px solid rgba(255,255,255,.12);margin:8px 0}

/* Hero 区域 */
.hero{padding:88px 0 40px;display:grid;grid-template-columns:1.2fr .8fr;gap:28px;align-items:center}
.hero h1{font-size:44px;line-height:1.15;margin:0 0 10px;font-weight:800}
.hero .lead{color:var(--muted);font-size:18px;line-height:1.8;margin:0 0 10px}
.hero-media{position:relative}
.hero-card{position:relative;border-radius:16px;border:0;background:transparent;box-shadow:none;padding:0;}
.hero-card img{display:block;width:100%;max-width:520px;height:auto;border-radius:12px;margin:0 auto}

/* 章节样式 */
.section{padding:56px 0}
.section h2{font-size:28px;margin:0 0 10px}
.section p.section-sub{color:var(--muted);margin:0 0 22px}
.section + .section{ border-top:1px solid rgba(255,255,255,.12) }

/* 网格和卡片 */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.card{background:transparent;border:0;border-radius:12px;padding:12px 4px;box-shadow:none}
.card:hover{transform:none;box-shadow:none}
.card h3{margin:6px 0 6px;font-size:18px;display:flex;align-items:center;gap:8px}
.card p{margin:0;color:var(--muted);line-height:1.7}

/* 计划样式 */
.plans{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}

/* 详情样式 */
details{border:1px solid rgba(255,255,255,.18);border-radius:12px;padding:14px 16px;background:rgba(255,255,255,.06)}
details+details{margin-top:10px}
details summary{cursor:pointer;font-weight:700}
details p{color:var(--muted);margin:8px 0 0}

/* Footer */
footer{margin-top:40px;border-top:1px solid rgba(255,255,255,.08);padding:24px 0;color:#cfd6e4}

/* 响应式设计 - 统一断点为992px */
@media (max-width: 992px){
  /* 布局调整 */
  .hero{grid-template-columns:1fr;padding-top:68px}
  .grid-3,.plans{grid-template-columns:1fr}
  
  /* 导航调整 */
  .nav-links,.nav-right{display:none}
  .menu-toggle{display:inline-flex}
  
  /* 文字大小调整 */
  .hero h1{font-size:30px;line-height:1.25;margin:0 0 10px}
  .hero .lead{font-size:16px;line-height:1.7;margin:0 0 10px}
  .section h2{font-size:22px}
  .card h3{font-size:16px}
  
  /* 图片和间距调整 */
  .hero-card img{max-width:300px}
  .section{padding:40px 0}
}