/* ===========================================================
   第零青春 · yyzz.xyz
   设计系统：破晓（Daybreak）
   色谱取自 第零青春-Logo：韶红 → 破晓橙 → 暖白 → 科技蓝，新芽青绿
   =========================================================== */

:root{
  --paper:    #FBF7F1;
  --paper-2:  #F5EDE2;
  --paper-3:  #EFE4D5;
  --card:     #FFFDFA;
  --ink:      #1C1917;
  --ink-2:    #463E38;
  --ink-3:    #7C6E64;
  --ink-4:    #A79789;
  --line:     #E5D9C8;
  --line-2:   #D8C8B2;

  --red:      #B81C22;   /* 韶红 */
  --orange:   #F2542D;   /* 破晓橙 */
  --amber:    #FFC79A;   /* 暖白 */
  --green:    #12A06C;   /* 新芽 */
  --blue:     #0E7FD4;   /* 科技蓝 */

  --grad: linear-gradient(112deg, #B81C22 0%, #F2542D 34%, #FFC79A 56%, #3FA9F5 82%, #0E7FD4 100%);

  --serif: "Noto Serif CJK SC","Source Han Serif SC","Songti SC","STSong",Songti,serif;
  --sans:  "Noto Sans CJK SC","Source Han Sans SC","PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;

  --r-s: 8px; --r-m: 14px; --r-l: 22px;
  --w: 1180px;
  --nav-h: 72px;
  --shadow-1: 0 1px 2px rgba(60,40,20,.04), 0 8px 26px -12px rgba(60,40,20,.14);
  --shadow-2: 0 2px 4px rgba(60,40,20,.05), 0 22px 48px -20px rgba(60,40,20,.24);
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%; scroll-behavior:smooth}
body{
  margin:0; background:var(--paper); color:var(--ink);
  font-family:var(--sans); font-size:16.5px; line-height:1.85;
  font-weight:400; letter-spacing:.01em;
  -webkit-font-smoothing:antialiased; text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
/* 纸纹：一层极淡的暖色噪点，避免大面积纯色发死 */
body::before{
  content:""; position:fixed; inset:0; pointer-events:none; z-index:0;
  background:
    radial-gradient(900px 420px at 78% -8%, rgba(242,84,45,.10), transparent 62%),
    radial-gradient(760px 380px at 8% 4%, rgba(14,127,212,.07), transparent 60%);
}
main,footer,nav{position:relative; z-index:1}

img,svg{max-width:100%}
a{color:inherit; text-decoration:none}
button{font:inherit; color:inherit; cursor:pointer}
::selection{background:rgba(242,84,45,.20)}

.wrap{width:100%; max-width:var(--w); margin-inline:auto; padding-inline:clamp(20px,5vw,44px)}

/* ---------- 顶栏：电脑一行 / 手机两行 ---------- */
.nav{
  position:sticky; top:0; z-index:60;
  background:rgba(251,247,241,.86);
  backdrop-filter:saturate(160%) blur(14px); -webkit-backdrop-filter:saturate(160%) blur(14px);
  border-bottom:1px solid rgba(229,217,200,.9);
}
.nav__in{
  max-width:var(--w); margin-inline:auto; padding:0 clamp(16px,4vw,44px);
  min-height:var(--nav-h);
  display:flex; align-items:center; gap:18px;
}
.brand{display:flex; align-items:center; gap:11px; flex:0 0 auto; padding-block:10px}
.brand img,.brand svg{width:38px;height:38px;flex:0 0 auto;display:block}
.brand__txt{display:flex; flex-direction:column; line-height:1.15}
.brand__cn{font-family:var(--serif); font-weight:700; font-size:18px; letter-spacing:.10em}
.brand__en{font-size:9.5px; letter-spacing:.24em; color:var(--ink-3); text-transform:uppercase; margin-top:3px}

.menu{display:flex; align-items:center; gap:4px; margin-left:auto; flex-wrap:nowrap}
.menu a{
  display:inline-flex; align-items:center; justify-content:center;  /* 文字两轴居中 */
  min-height:34px; padding:0 13px; border-radius:999px;
  font-size:14.5px; color:var(--ink-2); letter-spacing:.04em;
  background:rgba(255,255,255,.42);          /* 一枚隐约按钮底 */
  border:1px solid rgba(229,217,200,.55);
  transition:background .22s, color .22s, border-color .22s;
  white-space:nowrap;
}
.menu a:hover{background:#fff; border-color:var(--line-2); color:var(--ink)}
.menu a[aria-current="page"]{
  color:#fff; background:var(--red); border-color:var(--red);
  box-shadow:0 6px 16px -8px rgba(184,28,34,.7);
}
.nav__cta{
  flex:0 0 auto; margin-left:6px;
  display:inline-flex; align-items:center; justify-content:center; gap:7px;
  min-height:38px; padding:0 18px; border-radius:999px;
  background:var(--ink); color:#fff; font-size:14.5px; letter-spacing:.06em;
  border:1px solid var(--ink); transition:transform .2s, background .2s;
}
.nav__cta:hover{background:var(--red); border-color:var(--red); transform:translateY(-1px)}
.nav__toggle{display:none; background:none; border:0; padding:8px; margin-left:auto}
.nav__toggle span{display:block; width:22px; height:1.6px; background:var(--ink); margin:5px 0; transition:.3s}

@media (max-width:960px){
  :root{--nav-h:auto}
  .nav__in{flex-wrap:wrap; padding-block:9px; gap:10px 12px}
  .brand{margin-right:auto}
  .nav__cta{order:2; margin-left:0}
  .menu{
    order:3; width:100%; margin-left:0;
    overflow-x:auto; overflow-y:hidden; scrollbar-width:none;
    flex-wrap:wrap;                 /* 宁可换行，也不横向滚动截断 */
    gap:6px; padding-bottom:2px;
  }
  .menu::-webkit-scrollbar{display:none}
  .menu a{font-size:13.5px; padding:0 11px; min-height:31px; background:rgba(255,255,255,.62)}
}

/* ---------- 通用排版 ---------- */
.eyebrow{
  display:inline-flex; align-items:center; gap:9px;
  font-size:11px; letter-spacing:.3em; text-transform:uppercase;
  color:var(--ink-3); font-weight:500;
}
.eyebrow::before{content:""; width:26px; height:1px; background:var(--orange); display:block}
h1,h2,h3,h4{font-family:var(--serif); font-weight:700; line-height:1.34; margin:0; letter-spacing:.02em}
h1{font-size:clamp(34px,5.2vw,60px); line-height:1.24; letter-spacing:.01em}
h2{font-size:clamp(26px,3.4vw,40px)}
h3{font-size:clamp(19px,2vw,23px); font-weight:700; line-height:1.5}
h4{font-size:16.5px; font-weight:700; line-height:1.6}
p{margin:0 0 1.05em}
p:last-child{margin-bottom:0}
.lead{font-size:clamp(17px,1.55vw,19.5px); line-height:1.92; color:var(--ink-2)}
.small{font-size:13.5px; line-height:1.8; color:var(--ink-3)}
.mono{font-variant-numeric:tabular-nums}
.hl{background:linear-gradient(transparent 62%, rgba(255,199,154,.62) 62%); padding:0 .1em}
.hl-blue{background:linear-gradient(transparent 62%, rgba(63,169,245,.24) 62%)}
.hl-green{background:linear-gradient(transparent 62%, rgba(31,181,127,.22) 62%)}

.sec{padding-block:clamp(64px,8.4vw,124px); position:relative}
.sec--tight{padding-block:clamp(44px,5.4vw,72px)}
.sec--paper2{background:linear-gradient(180deg, rgba(245,237,226,0) 0%, rgba(245,237,226,.72) 12%, rgba(245,237,226,.72) 88%, rgba(245,237,226,0) 100%)}
.sec__head{max-width:760px; margin-bottom:clamp(30px,4vw,52px)}
.sec__head h2{margin-top:16px}
.sec__head .lead{margin-top:18px}
.sec__num{
  font-size:11px; letter-spacing:.3em; color:var(--orange);
  font-weight:600; display:block; margin-bottom:10px;
}
.rule{height:1px; background:var(--line); border:0; margin:0}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:9px;
  min-height:50px; padding:0 26px; border-radius:999px;
  font-size:15.5px; letter-spacing:.05em; font-weight:500;
  border:1px solid transparent; transition:transform .22s, box-shadow .22s, background .22s, color .22s;
  text-align:center;
}
.btn--pri{background:var(--red); color:#fff; box-shadow:0 10px 24px -12px rgba(184,28,34,.8)}
.btn--pri:hover{background:#a3181e; transform:translateY(-2px); box-shadow:0 16px 32px -14px rgba(184,28,34,.9)}
.btn--ink{background:var(--ink); color:#fff}
.btn--ink:hover{background:var(--orange); transform:translateY(-2px)}
.btn--ghost{border-color:var(--line-2); color:var(--ink); background:rgba(255,255,255,.5)}
.btn--ghost:hover{background:#fff; border-color:var(--ink-3); transform:translateY(-2px)}
.btn--sm{min-height:40px; padding:0 18px; font-size:14px}
.btn-row{display:flex; flex-wrap:wrap; gap:12px; margin-top:30px}

/* ---------- Hero ---------- */
.hero{padding-block:clamp(46px,7vw,96px) clamp(40px,6vw,80px); position:relative; overflow:hidden}
.hero__grid{
  display:grid; grid-template-columns:minmax(0,1.16fr) minmax(0,.84fr);
  gap:clamp(28px,4.4vw,60px); align-items:center;
}
.hero h1{margin-top:22px}
.hero__sub{margin-top:24px; font-size:clamp(16.5px,1.6vw,19px); line-height:1.95; color:var(--ink-2); max-width:36em}
.hero__mark{display:flex; justify-content:center; align-items:center; position:relative}
.hero__mark svg{width:min(100%,392px); height:auto; overflow:visible}
.hero__mark::after{
  content:""; position:absolute; inset:auto 0 -6% 0; height:1px;
  background:linear-gradient(90deg,transparent,var(--line-2),transparent);
}
.ring{transform-origin:130px 130px; animation:spin 34s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.halo{animation:breathe 7s ease-in-out infinite}
@keyframes breathe{0%,100%{opacity:.75; transform:scale(1)}50%{opacity:1; transform:scale(1.035)}}
@media (prefers-reduced-motion:reduce){
  .ring,.halo{animation:none}
  html{scroll-behavior:auto}
}
@media (max-width:900px){
  .hero__grid{grid-template-columns:1fr}
  .hero__mark{order:-1; margin-bottom:8px}
  .hero__mark svg{width:min(70%,268px)}
  .hero__mark::after{display:none}
}

/* 数字锚 */
.stats{
  display:grid; grid-template-columns:repeat(4,1fr);
  border-top:1px solid var(--line); border-bottom:1px solid var(--line);
  margin-top:clamp(38px,5vw,64px);
}
.stats>div{padding:22px 20px 20px; border-right:1px solid var(--line)}
.stats>div:last-child{border-right:0}
.stats b{display:block; font-family:var(--serif); font-size:clamp(26px,3vw,34px); line-height:1.1; letter-spacing:.01em; font-variant-numeric:tabular-nums}
.stats>div>span{display:block; font-size:12.5px; color:var(--ink-3); margin-top:8px; letter-spacing:.08em}
.stats em{font-style:normal; font-size:13px; color:var(--ink-4)}
@media (max-width:720px){
  .stats{grid-template-columns:repeat(2,1fr)}
  .stats>div:nth-child(2){border-right:0}
  .stats>div:nth-child(1),.stats>div:nth-child(2){border-bottom:1px solid var(--line)}
}

/* ---------- 对照表 ---------- */
.vs{display:grid; grid-template-columns:1fr 1fr; gap:0; border:1px solid var(--line); border-radius:var(--r-l); overflow:hidden; background:var(--card)}
.vs__col{padding:clamp(22px,3vw,34px)}
.vs__col+.vs__col{border-left:1px solid var(--line)}
.vs__tag{font-size:11px; letter-spacing:.28em; text-transform:uppercase; color:var(--ink-3); display:block; margin-bottom:8px}
.vs__col h3{margin-bottom:4px}
.vs__col--b{background:linear-gradient(180deg, rgba(255,199,154,.16), rgba(255,253,250,0))}
.vs__col--a h3{color:var(--ink-2)}
.vs__col--b h3{color:var(--red)}
.vs dl{margin:18px 0 0}
.vs dt{font-size:12.5px; color:var(--ink-4); letter-spacing:.12em; margin-top:16px}
.vs dd{margin:4px 0 0; font-size:15.5px; color:var(--ink-2); line-height:1.72}
.vs__col--a dd{color:var(--ink-3)}
@media (max-width:760px){
  .vs{grid-template-columns:1fr}
  .vs__col+.vs__col{border-left:0; border-top:1px solid var(--line)}
}

/* ---------- 卡片 ---------- */
.cards{display:grid; gap:16px}
.cards--3{grid-template-columns:repeat(3,1fr)}
.cards--2{grid-template-columns:repeat(2,1fr)}
.cards--4{grid-template-columns:repeat(4,1fr)}
@media (max-width:980px){.cards--4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:860px){.cards--3{grid-template-columns:1fr}}
@media (max-width:720px){.cards--2,.cards--4{grid-template-columns:1fr}}

.card{
  background:var(--card); border:1px solid var(--line); border-radius:var(--r-m);
  padding:clamp(20px,2.4vw,28px); box-shadow:var(--shadow-1);
  transition:transform .26s cubic-bezier(.2,.8,.2,1), box-shadow .26s, border-color .26s;
  position:relative; display:flex; flex-direction:column;
}
.card:hover{transform:translateY(-3px); box-shadow:var(--shadow-2); border-color:var(--line-2)}
.card h3{margin-bottom:10px}
.card p{font-size:15px; color:var(--ink-2); line-height:1.8}
.card__num{
  font-family:var(--serif); font-size:12px; letter-spacing:.2em;
  color:var(--orange); margin-bottom:14px; display:block; font-weight:700;
}
.card__foot{margin-top:auto; padding-top:16px; font-size:13px; color:var(--ink-3); display:flex; gap:8px; align-items:center; flex-wrap:wrap}
.card--link{cursor:pointer}
.card--link:hover h3{color:var(--red)}
.card--dark{background:var(--ink); border-color:var(--ink); color:#fff}
.card--dark p{color:rgba(255,255,255,.78)}
.card--dark h3{color:#fff}
.card--dark .card__num{color:var(--amber)}

/* 入口卡：大号 */
.gate{
  display:grid; grid-template-columns:repeat(2,1fr); gap:18px;
}
@media (max-width:800px){.gate{grid-template-columns:1fr}}
.gate__item{
  display:grid; grid-template-columns:auto 1fr; gap:clamp(16px,2vw,24px); align-items:start;
  padding:clamp(22px,2.8vw,32px); background:var(--card);
  border:1px solid var(--line); border-radius:var(--r-m); box-shadow:var(--shadow-1);
  transition:.26s cubic-bezier(.2,.8,.2,1);
}
.gate__item:hover{transform:translateY(-3px); box-shadow:var(--shadow-2); border-color:var(--orange)}
.gate__ico{
  width:52px; height:52px; border-radius:14px; display:grid; place-items:center;
  background:var(--paper-2); border:1px solid var(--line);
}
.gate__ico svg{width:26px;height:26px}
.gate__item h3{margin-bottom:7px; font-size:20px}
.gate__item p{font-size:14.5px; color:var(--ink-2); line-height:1.75}
.gate__go{margin-top:12px; font-size:13px; letter-spacing:.1em; color:var(--red); font-weight:600}

/* ---------- 引文 ---------- */
.quote{
  border-left:2px solid var(--orange); padding:8px 0 8px clamp(20px,3vw,34px);
  max-width:820px;
}
.quote q{font-family:var(--serif); font-size:clamp(20px,2.4vw,27px); line-height:1.72; display:block}
.quote cite{display:block; margin-top:14px; font-size:13px; color:var(--ink-3); font-style:normal; letter-spacing:.1em}

/* ---------- 页脚 ---------- */
.foot{background:var(--ink); color:rgba(255,255,255,.72); padding-block:clamp(48px,6vw,76px) 30px; margin-top:0}
.foot a{color:rgba(255,255,255,.72)}
.foot a:hover{color:#fff}
.foot__grid{display:grid; grid-template-columns:1.5fr 1fr 1fr 1fr; gap:32px}
@media (max-width:860px){.foot__grid{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.foot__grid{grid-template-columns:1fr}}
.foot h4{color:#fff; font-family:var(--sans); font-size:13px; letter-spacing:.2em; margin-bottom:14px; font-weight:600}
.foot ul{list-style:none; margin:0; padding:0}
.foot li{margin-bottom:9px; font-size:14px}
.foot__brand{display:flex; align-items:center; gap:12px; margin-bottom:16px}
.foot__brand img,.foot__brand svg{width:44px;height:44px;flex:0 0 auto;display:block}
.foot__brand b{font-family:var(--serif); font-size:19px; color:#fff; letter-spacing:.1em; display:block; line-height:1.3}
.foot__brand span{font-size:10px; letter-spacing:.26em; color:rgba(255,255,255,.5); text-transform:uppercase}
.foot__bar{
  margin-top:44px; padding-top:22px; border-top:1px solid rgba(255,255,255,.14);
  display:flex; justify-content:space-between; gap:16px; flex-wrap:wrap;
  font-size:12.5px; color:rgba(255,255,255,.48); letter-spacing:.05em;
}

/* ---------- 滚动显现 ---------- */
.rv{opacity:0; transform:translateY(18px); transition:opacity .7s cubic-bezier(.2,.8,.2,1), transform .7s cubic-bezier(.2,.8,.2,1)}
.rv.in{opacity:1; transform:none}
@media (prefers-reduced-motion:reduce){.rv{opacity:1; transform:none; transition:none}}

/* ---------- 页面头（内页） ---------- */
.phead{padding-block:clamp(38px,5vw,66px) clamp(22px,3vw,34px); border-bottom:1px solid var(--line)}
.phead .eye-row{display:flex; gap:14px; align-items:center; flex-wrap:wrap; margin-bottom:18px}
.phead h1{font-size:clamp(30px,4.2vw,48px); max-width:24em}
.phead .lead{margin-top:18px; max-width:44em}
.crumb{font-size:12.5px; color:var(--ink-4); letter-spacing:.08em; margin-bottom:14px}
.crumb a:hover{color:var(--red)}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex; align-items:center; gap:6px;
  font-size:12px; letter-spacing:.06em; padding:3px 10px; border-radius:999px;
  background:var(--paper-2); color:var(--ink-2); border:1px solid var(--line); white-space:nowrap;
}
.tag--red{background:rgba(184,28,34,.08); color:var(--red); border-color:rgba(184,28,34,.22)}
.tag--green{background:rgba(18,160,108,.09); color:#0d7a52; border-color:rgba(18,160,108,.22)}
.tag--blue{background:rgba(14,127,212,.08); color:#0b62a6; border-color:rgba(14,127,212,.2)}
.tag--orange{background:rgba(242,84,45,.09); color:#c33b18; border-color:rgba(242,84,45,.22)}

/* ---------- 提示条 ---------- */
.note{
  border:1px solid var(--line); border-left:3px solid var(--blue);
  background:rgba(14,127,212,.045); border-radius:0 var(--r-s) var(--r-s) 0;
  padding:16px 20px; font-size:14px; color:var(--ink-2); line-height:1.8;
}
.note--warn{border-left-color:var(--orange); background:rgba(242,84,45,.05)}
.note b{color:var(--ink)}

/* ---------- 打印（21天计划） ---------- */
@media print{
  .nav,.foot,.btn,.nav__cta{display:none !important}
  body{background:#fff}
  body::before{display:none}
  .sec{padding-block:12px}
  .card{box-shadow:none; break-inside:avoid}
}