/* ============================================================
   牛牛的小站 · 全站共享样式 (style.css)
   多页面网站共用：底色、导航、首屏、内页、密码门、页脚、响应式
   ============================================================ */

/* ---- base ---- */
:root{
--bg:#05060f;
--ink:#f2f4ff;
--sub:#9aa3c7;
--muted-2:#7c84a3;
--c1:#7c5cff;
--c2:#22d3ee;
--c3:#ff5ea8;
--glass:rgba(255,255,255,.06);
--glass-brd:rgba(255,255,255,.14);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
background:var(--bg);
color:var(--ink);
font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
overflow-x:hidden;
min-height:100vh;
}
::selection{background:rgba(124,92,255,.5)}
:focus-visible{outline:2px solid var(--c2);outline-offset:2px;border-radius:6px}
img{max-width:100%}

/* ---- 背景特效层 ---- */
.bg-fx{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.aurora{
position:absolute;inset:-20%;
background:
radial-gradient(40% 55% at 20% 30%, rgba(124,92,255,.45), transparent 60%),
radial-gradient(38% 50% at 80% 25%, rgba(34,211,238,.32), transparent 60%),
radial-gradient(45% 55% at 60% 80%, rgba(255,94,168,.28), transparent 60%);
filter:blur(20px);
animation:drift 18s ease-in-out infinite alternate;
pointer-events:none;
}
@keyframes drift{
0%{transform:translate3d(-3%,-2%,0) scale(1) rotate(0deg)}
50%{transform:translate3d(3%,2%,0) scale(1.08) rotate(2deg)}
100%{transform:translate3d(-2%,3%,0) scale(1.03) rotate(-2deg)}
}
.grid-floor{
position:absolute;left:-25%;right:-25%;bottom:-10%;height:55%;
background-image:
linear-gradient(rgba(124,92,255,.18) 1px, transparent 1px),
linear-gradient(90deg, rgba(34,211,238,.14) 1px, transparent 1px);
background-size:56px 56px;
transform:perspective(500px) rotateX(58deg);
transform-origin:bottom;
mask-image:linear-gradient(transparent, #000 55%);
-webkit-mask-image:linear-gradient(transparent, #000 55%);
animation:gridmove 6s linear infinite;
pointer-events:none;
}
@keyframes gridmove{
from{background-position:0 0}
to{background-position:0 56px}
}
#stars{position:absolute;inset:0;width:100%;height:100%;pointer-events:none}
.bg-fx::after{
content:"";position:absolute;inset:0;
background:radial-gradient(120% 90% at 50% 40%, transparent 55%, rgba(5,6,15,.75));
pointer-events:none;
}

/* ---- 导航 ---- */
.nav{
position:relative;z-index:20;
display:flex;align-items:center;justify-content:space-between;
padding:18px clamp(16px,4vw,48px);
}
.logo{
display:flex;align-items:center;gap:10px;
font-weight:800;font-size:18px;letter-spacing:.5px;
text-decoration:none;color:var(--ink);
}
.logo-badge{
width:38px;height:38px;border-radius:12px;
overflow:hidden;display:block;flex:none;
box-shadow:0 0 18px rgba(124,92,255,.55);
animation:pulse 3s ease-in-out infinite;
}
.logo-badge img{width:100%;height:100%;object-fit:cover;display:block}
@keyframes pulse{
0%,100%{box-shadow:0 0 14px rgba(124,92,255,.45)}
50%{box-shadow:0 0 26px rgba(34,211,238,.7)}
}
.nav-links{
display:flex;gap:6px;
background:var(--glass);
border:1px solid var(--glass-brd);
border-radius:999px;
padding:6px;
backdrop-filter:blur(14px);
-webkit-backdrop-filter:blur(14px);
}
.nav-links a{
color:var(--sub);text-decoration:none;
font-size:14px;padding:10px 16px;border-radius:999px;
transition:color .25s, background .25s;
min-height:44px;display:inline-flex;align-items:center;
}
.nav-links a:hover,.nav-links a:focus-visible{color:#fff;background:rgba(255,255,255,.12)}
.nav-links a.active{
color:#fff;
background:linear-gradient(135deg,rgba(124,92,255,.55),rgba(34,211,238,.4));
}
.nav-toggle{
display:none;
width:44px;height:44px;border-radius:12px;border:1px solid var(--glass-brd);
background:var(--glass);color:var(--ink);cursor:pointer;
align-items:center;justify-content:center;
backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);
}

/* ---- 首页首屏 ---- */
.hero{
position:relative;
min-height:100svh;
display:flex;flex-direction:column;
overflow:hidden;
}
.hero-center{
position:relative;z-index:5;
flex:1;
display:flex;flex-direction:column;
align-items:center;justify-content:center;
text-align:center;
padding:24px clamp(16px,5vw,40px) 80px;
gap:22px;
}
.hero-tag{
display:inline-flex;align-items:center;gap:8px;
font-size:13px;color:var(--sub);letter-spacing:2px;
border:1px solid var(--glass-brd);
background:var(--glass);
border-radius:999px;padding:8px 18px;
backdrop-filter:blur(10px);
-webkit-backdrop-filter:blur(10px);
animation:rise .8s .1s both;
}
.hero-tag .dot{
width:8px;height:8px;border-radius:50%;
background:var(--c2);
box-shadow:0 0 10px var(--c2);
animation:blink 1.6s ease-in-out infinite;
}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.3}}
.hero-title{
font-size:clamp(44px,10vw,104px);
font-weight:900;
line-height:1.12;
letter-spacing:2px;
background:linear-gradient(120deg,#fff 10%,var(--c2) 35%,var(--c1) 60%,var(--c3) 85%,#fff);
background-size:250% auto;
-webkit-background-clip:text;
background-clip:text;
color:transparent;
animation:shine 6s linear infinite, rise .8s .25s both;
text-shadow:0 0 60px rgba(124,92,255,.25);
will-change:transform;
}
@keyframes shine{to{background-position:250% center}}
.hero-sub{
max-width:560px;
color:var(--sub);
font-size:clamp(15px,2.4vw,18px);
line-height:1.8;
animation:rise .8s .4s both;
}
.type-line{color:var(--c2);font-weight:600}
.cursor{
display:inline-block;width:2px;height:1.1em;
background:var(--c2);vertical-align:-0.15em;margin-left:2px;
animation:blink .9s steps(1) infinite;
visibility:hidden;
}
.hero-cta{
display:flex;gap:14px;flex-wrap:wrap;justify-content:center;
animation:rise .8s .55s both;
}
.btn{
min-height:48px;padding:13px 30px;border-radius:999px;
font-size:15px;font-weight:700;letter-spacing:1px;
text-decoration:none;cursor:pointer;border:none;
transition:transform .25s, box-shadow .25s;
display:inline-flex;align-items:center;justify-content:center;
}
.btn:active{transform:scale(.96)}
.btn-primary{
color:#fff;
background:linear-gradient(135deg,var(--c1),var(--c2));
box-shadow:0 8px 30px rgba(124,92,255,.45);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 40px rgba(34,211,238,.55)}
.btn-ghost{
color:var(--ink);
background:var(--glass);
border:1px solid var(--glass-brd);
backdrop-filter:blur(10px);
-webkit-backdrop-filter:blur(10px);
}
.btn-ghost:hover{transform:translateY(-3px);background:rgba(255,255,255,.12)}
@keyframes rise{
from{opacity:0;transform:translateY(26px)}
to{opacity:1;transform:translateY(0)}
}
.stats{
position:relative;z-index:5;
display:grid;grid-template-columns:repeat(3,1fr);
gap:12px;
width:min(760px,92vw);
margin:0 auto;
padding:0 0 34px;
}
.stat{
background:var(--glass);
border:1px solid var(--glass-brd);
border-radius:16px;
padding:16px 12px;
text-align:center;
backdrop-filter:blur(12px);
-webkit-backdrop-filter:blur(12px);
}
.stat b{
display:block;font-size:clamp(20px,4vw,26px);
background:linear-gradient(135deg,var(--c2),var(--c1));
-webkit-background-clip:text;background-clip:text;color:transparent;
}
.stat i{font-style:normal;font-size:12px;color:var(--sub);letter-spacing:2px}
.scroll-hint{
position:absolute;bottom:26px;left:50%;transform:translateX(-50%);
z-index:5;display:flex;flex-direction:column;align-items:center;gap:8px;
color:var(--sub);font-size:12px;letter-spacing:3px;text-decoration:none;
}
.mouse{
width:26px;height:42px;border:2px solid var(--glass-brd);border-radius:14px;
display:flex;justify-content:center;padding-top:7px;
}
.mouse span{
width:4px;height:8px;border-radius:2px;background:var(--c2);
animation:wheel 1.6s ease-in-out infinite;
}
@keyframes wheel{
0%{opacity:1;transform:translateY(0)}
70%{opacity:0;transform:translateY(12px)}
100%{opacity:0}
}

/* ---- 内页布局 ---- */
.page{
position:relative;
min-height:100vh;
display:flex;flex-direction:column;
overflow:hidden;
}
.page-main{
position:relative;z-index:5;
flex:1;
display:flex;flex-direction:column;align-items:center;justify-content:center;
text-align:center;
padding:120px clamp(20px,5vw,48px) 90px;
gap:22px;
}
.page-title{
font-size:clamp(34px,6vw,54px);
font-weight:900;line-height:1.15;letter-spacing:1px;
background:linear-gradient(120deg,#fff 10%,var(--c2) 40%,var(--c1) 70%,var(--c3) 95%);
background-size:250% auto;
-webkit-background-clip:text;background-clip:text;color:transparent;
animation:shine 7s linear infinite, rise .8s .25s both;
text-shadow:0 0 40px rgba(124,92,255,.2);
}
.page-sub{
max-width:560px;color:var(--sub);
font-size:clamp(15px,2.4vw,17px);line-height:1.8;
animation:rise .8s .4s both;
}

/* ---- 通用区块 ---- */
.wrap{width:min(1080px,94vw);margin:0 auto}
.body-section{
position:relative;z-index:5;
padding:90px clamp(16px,5vw,48px) 120px;
text-align:center;
}
.section-title{
font-size:clamp(24px,4.5vw,34px);font-weight:900;margin-bottom:14px;
background:linear-gradient(120deg,var(--c2),var(--c1));
-webkit-background-clip:text;background-clip:text;color:transparent;
}
.section-lead{color:var(--sub);max-width:520px;margin:0 auto 40px;line-height:1.8}
.cards{
display:grid;
grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
gap:18px;
width:min(1080px,94vw);
margin:0 auto;
}
.card{
background:var(--glass);
border:1px solid var(--glass-brd);
border-radius:20px;
padding:30px 22px;
text-align:left;
text-decoration:none;color:inherit;
transition:transform .3s, border-color .3s, box-shadow .3s;
}
.card:hover{
transform:translateY(-6px);
border-color:rgba(124,92,255,.6);
box-shadow:0 18px 40px rgba(124,92,255,.18);
}
.card .icon{
width:52px;height:52px;border-radius:14px;
display:grid;place-items:center;font-size:26px;margin-bottom:16px;
background:linear-gradient(135deg,rgba(124,92,255,.35),rgba(34,211,238,.25));
border:1px solid var(--glass-brd);
}
.card h3{font-size:18px;margin-bottom:10px}
.card p{font-size:14px;color:var(--sub);line-height:1.7;margin:0}
.card .more{display:inline-flex;align-items:center;gap:5px;margin-top:14px;font-size:14px;color:var(--c2);font-weight:600}
.card .more .ar{transition:transform .2s}
.card:hover .more .ar{transform:translateX(4px)}

/* ---- 密码门 ---- */
.gate{
max-width:460px;margin:0 auto;padding:38px 28px;
background:var(--glass);border:1px solid var(--glass-brd);border-radius:24px;
text-align:center;box-shadow:0 18px 40px rgba(124,92,255,.12);
}
.gate-ico{
width:58px;height:58px;margin:0 auto 18px;border-radius:16px;
display:grid;place-items:center;font-size:26px;
background:linear-gradient(135deg,rgba(124,92,255,.35),rgba(34,211,238,.25));
border:1px solid var(--glass-brd);
}
.gate h3{font-size:20px;margin-bottom:8px}
.gate>p{font-size:14px;color:var(--sub);line-height:1.7;margin:0 auto 22px;max-width:360px}
.gate-form{display:flex;flex-direction:column;gap:14px}
.gate-input{
height:52px;border-radius:14px;padding:0 18px;font-size:16px;color:var(--ink);
background:rgba(255,255,255,.05);border:1px solid var(--glass-brd);outline:none;
text-align:center;letter-spacing:8px;transition:border-color .2s, box-shadow .2s;
}
.gate-input::placeholder{letter-spacing:0;color:var(--muted-2)}
.gate-input:focus{border-color:var(--c2);box-shadow:0 0 0 3px rgba(34,211,238,.18)}
.gate-btn{width:100%}
.gate-msg{min-height:20px;margin-top:14px;font-size:14px}
.gate-msg.ok{color:var(--c2)}
.gate-msg.err{color:#ff6b8a}

/* ---- 页脚 ---- */
.footer{
position:relative;z-index:5;
padding:30px 16px 40px;
text-align:center;
color:var(--sub);
font-size:13px;
border-top:1px solid rgba(255,255,255,.08);
}

/* ---- 响应式 ---- */
@media (max-width:720px){
.nav{padding:14px 14px}
.logo{font-size:16px}
.logo-badge{width:34px;height:34px}
.nav-toggle{display:inline-flex}
.nav-links{
  position:fixed;top:70px;left:14px;right:14px;
  flex-direction:column;align-items:stretch;gap:6px;
  padding:12px;border-radius:20px;
  background:rgba(8,9,22,.96);border:1px solid var(--glass-brd);
  box-shadow:0 20px 50px rgba(0,0,0,.5);
  transform:translateY(-14px);opacity:0;visibility:hidden;
  transition:transform .25s,opacity .25s;
}
.nav-links.open{transform:translateY(0);opacity:1;visibility:visible}
.nav-links a{justify-content:center;padding:13px;font-size:15px}
.hero-center{gap:16px;padding:20px 18px 96px}
.hero-tag{font-size:12px;padding:7px 14px;letter-spacing:1.5px}
.hero-title{letter-spacing:0}
.hero-sub{font-size:16px}
.hero-cta{gap:12px;margin-top:4px}
.btn{min-height:46px;padding:12px 26px;font-size:15px}
.stats{gap:10px;padding:0 0 30px}
.stat{padding:14px 8px;border-radius:14px}
/* 移动端关闭 backdrop-filter，避免在极光模糊背景上的渲染重叠 bug */
.nav-links,.nav-toggle,.hero-tag,.btn-ghost,.stat,.gate{
  -webkit-backdrop-filter:none;backdrop-filter:none;
}
.nav-links{background:rgba(10,12,26,.6)}
.nav-toggle{background:rgba(10,12,26,.6)}
.hero-tag{background:rgba(10,12,26,.5)}
.btn-ghost{background:rgba(255,255,255,.1)}
.stat{background:rgba(10,12,26,.5)}
.gate{background:rgba(10,12,26,.5)}
.scroll-hint{bottom:max(14px,env(safe-area-inset-bottom))}
.body-section{padding:64px 18px 80px}
.page-main{padding:110px 18px 70px}
.cards{grid-template-columns:1fr;width:min(560px,100%)}
.card{padding:26px 22px}
.footer{padding:26px 16px calc(34px + env(safe-area-inset-bottom))}
}

/* 横屏矮屏：压缩首屏 */
@media (max-height:640px) and (max-width:900px){
.hero{min-height:auto}
.hero-center{padding:12px 16px 64px;gap:12px}
.hero-title{font-size:clamp(38px,9vw,60px)}
.hero-sub{font-size:15px}
.stats{padding:0 0 18px}
.scroll-hint{display:none}
.page-main{padding:90px 16px 60px}
}

@media (prefers-reduced-motion:reduce){
*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
html{scroll-behavior:auto}
}