/* =============================================================
   零度星锋 · PC 装机助手 — 首页样式（index.html 专用）
   说明：顶部悬浮导航 + Hero 品牌区 + 六宫格卡片导航，
        flex/grid 自适应布局，移动端单列、字号缩小。
   ============================================================= */

/* ---------- 重置与变量 ---------- */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#ffffff;--card:#fff;--text:#1f2937;--text-2:#4b5563;--text-3:#9ca3af;
  --blue:#0077ff;--line:#eceef1;
  --font:Inter,system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.7;font-size:15px}
a{color:inherit;text-decoration:none}
a:focus-visible{outline:2px solid var(--blue);outline-offset:2px;border-radius:4px}

/* ===== 顶部导航（悬浮吸顶） ===== */
.nav-bar{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:1120px;margin:0 auto;padding:0 20px;height:56px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:8px;font-weight:700;font-size:18px;letter-spacing:.5px}
.logo-img{display:block;height:30px;width:auto;border-radius:4px}
.nav-links{display:flex;align-items:center;gap:2px;list-style:none}
.nav-links a{padding:6px 16px;font-size:14px;color:var(--text-2);border-radius:8px;transition:all .15s}
.nav-links a:hover{color:var(--blue);background:rgba(0,119,255,.06)}
.nav-links a.active{color:var(--blue);font-weight:600}
.nav-sep{width:1px;height:16px;background:var(--line);margin:0 8px}

/* ===== Hero 品牌区 ===== */
.hero{text-align:center;padding:56px 20px 40px}
.hero .brand{font-size:2.6rem;font-weight:800;letter-spacing:1px;line-height:1.2}
.hero .brand .brand-logo{display:block;margin:0 auto;max-width:min(400px,86vw);height:auto;border-radius:6px}
.hero .brand .en{font-size:1rem;font-weight:400;color:var(--text-3);letter-spacing:2px;display:block;margin-top:6px}
.hero .slogan{color:var(--text-2);font-size:1.02rem;margin-top:12px}

/* ===== 六宫格卡片导航 ===== */
.container{max-width:1120px;margin:0 auto;padding:0 20px 40px}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px}
.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:26px;box-shadow:none;transition:box-shadow .2s,border-color .2s;display:flex;flex-direction:column}
.card:hover{box-shadow:0 4px 16px rgba(0,119,255,.08);border-color:#bcd7f8}
.card .top{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.card .icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:20px;color:#fff;flex-shrink:0}
.card h3{font-size:1.15rem;font-weight:700}
.card .desc{color:var(--text-2);font-size:.9rem;margin-bottom:18px;flex-grow:1}
.card .more{font-size:.88rem;color:var(--text-3);font-weight:500;display:inline-flex;align-items:center;gap:4px;transition:color .15s;align-self:flex-start}
.card .more:hover{color:var(--blue)}
.card .more::after{content:'\2192';transition:transform .15s}
.card .more:hover::after{transform:translateX(3px)}

/* 卡片配色 */
.c-blue .icon{background:linear-gradient(135deg,#1a86ff,#0077ff)}
.c-orange .icon{background:linear-gradient(135deg,#ffb74d,#fb8c00)}
.c-purple .icon{background:linear-gradient(135deg,#ab47bc,#8e24aa)}
.c-green .icon{background:linear-gradient(135deg,#66bb6a,#43a047)}
.c-cyan .icon{background:linear-gradient(135deg,#26c6da,#00acc1)}
.c-pink .icon{background:linear-gradient(135deg,#f06292,#ec407a)}
.c-amber .icon{background:linear-gradient(135deg,#ffca28,#ffa000)}

/* ===== 页脚 ===== */
footer{max-width:1120px;margin:0 auto;padding:24px 20px 40px;text-align:center;border-top:1px solid var(--line)}
footer .copyright{color:var(--text-3);font-size:12px}
footer .copyright a{color:var(--text-3);text-decoration:none}
footer .copyright a:hover{color:var(--blue);text-decoration:underline}

/* ---------- 移动端适配（≤640px） ---------- */
@media(max-width:640px){
  .hero{padding:40px 16px 28px}
  .hero .brand{font-size:1.9rem}
  .container,.nav-inner,footer{padding-left:16px;padding-right:16px}
  .grid{grid-template-columns:1fr}
  .nav-links a{padding:5px 12px;font-size:13px}
}

/* ---------- 自定义光标 ---------- */
html,body{cursor:url(../images/cursor.svg) 8 3,auto}
a,button,input,select,textarea,label{cursor:url(../images/cursor.svg) 8 3,pointer}