/* ═══════════════════════════════════════════
   YUVIA CITY · 悦沙城 招商官网
   设计语言：夜色橙辉 + 磨砂玻璃 + 流动光场
   主色源自产能交易中心 Logo（橙红循环箭头）
   ═══════════════════════════════════════════ */

/* ── 1. 令牌 ─────────────────────────────── */
:root{
  --ink-900:#0b0e11;
  --ink-850:#0e1216;
  --ink-800:#12171c;
  --ink-700:#181e25;

  --sand-050:#fef6ee;
  --sand-200:#f0d9c8;
  --sand-400:#c4a088;
  --sand-600:#8c7062;

  /* Logo-derived orange-red palette */
  --gold:#E86A25;        /* 主色 — 对应 Logo 循环箭头橙色 */
  --gold-hi:#FF924D;      /* 高亮 — 明亮暖橙 */
  --gold-dp:#C44A1C;      /* 深色 — 对应 Logo 竖杠红橙 */
  --jade:#5f9e93;
  --clay:#d46a2a;         /* 调和 — 琥珀陶土 */

  --glass-bg:linear-gradient(158deg,rgba(255,255,255,.11),rgba(255,255,255,.035));
  --glass-bd:rgba(255,255,255,.12);
  --glass-hl:inset 0 1px 0 rgba(255,255,255,.18);
  --glass-sh:0 24px 60px -28px rgba(0,0,0,.85);
  --blur:18px;

  /* Hero 区增强玻璃 —— 更高不透明度，确保在背景图上可读 */
  --glass-hero-bg:linear-gradient(158deg,rgba(255,255,255,.16),rgba(255,255,255,.06));
  --glass-hero-bd:rgba(255,255,255,.16);

  --r-sm:12px; --r-md:18px; --r-lg:24px; --r-xl:32px;
  --maxw:1240px;
  --ease:cubic-bezier(.16,1,.3,1);
  --ease-in:cubic-bezier(.7,0,.84,0);
  --spring:cubic-bezier(.34,1.4,.64,1);

  --font:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",system-ui,sans-serif;
  --font-num:"Optima","Avenir Next","Segoe UI Variable Display","Trebuchet MS",var(--font);
}

*,*::before,*::after{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;background:var(--ink-900);color:var(--sand-050);
  font-family:var(--font);font-size:16px;line-height:1.7;
  -webkit-font-smoothing:antialiased;overflow-x:hidden;
}
img,svg,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3{margin:0;font-weight:650;letter-spacing:-.02em;line-height:1.2}
p{margin:0}
table{border-collapse:collapse;width:100%}
::selection{background:rgba(232,106,37,.3);color:#fff}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px;border-radius:6px}

.wrap{width:min(100% - 2.5rem,var(--maxw));margin-inline:auto}
@media(max-width:640px){.wrap{width:calc(100% - 2rem)}}

/* ── 2. 光场背景 ─────────────────────────── */
.light-field{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.aurora{
  position:absolute;border-radius:50%;filter:blur(90px);opacity:.5;
  will-change:transform;mix-blend-mode:screen;
}
.aurora--a{width:60vw;height:60vw;max-width:820px;max-height:820px;top:-16vh;left:-8vw;
  background:radial-gradient(circle at 50% 50%,rgba(232,106,37,.42),rgba(232,106,37,0) 68%);
  animation:drift-a 34s var(--ease) infinite alternate}
.aurora--b{width:52vw;height:52vw;max-width:720px;max-height:720px;top:38vh;right:-12vw;
  background:radial-gradient(circle at 50% 50%,rgba(196,74,28,.34),rgba(196,74,28,0) 68%);
  animation:drift-b 42s var(--ease) infinite alternate}
.aurora--c{width:44vw;height:44vw;max-width:620px;max-height:620px;bottom:-14vh;left:26vw;
  background:radial-gradient(circle at 50% 50%,rgba(255,146,77,.30),rgba(255,146,77,0) 70%);
  animation:drift-c 50s var(--ease) infinite alternate}
@keyframes drift-a{to{transform:translate3d(14vw,10vh,0) scale(1.18)}}
@keyframes drift-b{to{transform:translate3d(-12vw,-14vh,0) scale(1.12)}}
@keyframes drift-c{to{transform:translate3d(10vw,-8vh,0) scale(.88)}}

.grid-veil{
  position:absolute;inset:0;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.028) 1px,transparent 1px),
                   linear-gradient(90deg,rgba(255,255,255,.028) 1px,transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 30%,#000 20%,transparent 78%);
          mask-image:radial-gradient(ellipse 90% 70% at 50% 30%,#000 20%,transparent 78%);
}
#particles{position:absolute;inset:0;width:100%;height:100%;opacity:.85}
.grain{
  position:absolute;inset:-100%;opacity:.05;pointer-events:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='140' height='140'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='140' height='140' filter='url(%23n)'/%3E%3C/svg%3E");
  animation:grain 7s steps(6) infinite;
}
@keyframes grain{
  0%,100%{transform:translate(0,0)}17%{transform:translate(-3%,-4%)}33%{transform:translate(4%,-2%)}
  50%{transform:translate(-2%,3%)}67%{transform:translate(3%,4%)}83%{transform:translate(-4%,2%)}
}
.pointer-glow{
  position:fixed;z-index:1;width:520px;height:520px;left:0;top:0;pointer-events:none;
  border-radius:50%;opacity:0;transform:translate3d(-50%,-50%,0);
  background:radial-gradient(circle,rgba(232,106,37,.13),transparent 62%);
  transition:opacity .7s var(--ease);will-change:transform;
}
.scroll-rail{position:fixed;top:0;left:0;right:0;height:2px;z-index:60;background:rgba(255,255,255,.05)}
.scroll-rail span{
  display:block;height:100%;width:0%;transform-origin:0 50%;
  background:linear-gradient(90deg,var(--gold-dp),var(--gold-hi),var(--jade));
  box-shadow:0 0 14px rgba(232,106,37,.7);
}

/* ── 3. 玻璃基类 ─────────────────────────── */
.glass{
  position:relative;background:var(--glass-bg);
  -webkit-backdrop-filter:blur(var(--blur)) saturate(150%);
          backdrop-filter:blur(var(--blur)) saturate(150%);
  border:1px solid var(--glass-bd);border-radius:var(--r-lg);
  box-shadow:var(--glass-hl),var(--glass-sh);
}
.glass::after{
  content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
  background:linear-gradient(140deg,rgba(255,255,255,.10),transparent 34%,transparent 66%,rgba(255,255,255,.05));
  opacity:.7;
}
.spot{overflow:hidden}
.spot::before{
  content:"";position:absolute;inset:-1px;border-radius:inherit;pointer-events:none;z-index:0;
  background:radial-gradient(340px circle at var(--mx,50%) var(--my,0%),rgba(232,106,37,.16),transparent 62%);
  opacity:0;transition:opacity .5s var(--ease);
}
.spot:hover::before{opacity:1}
.spot>*{position:relative;z-index:1}

/* ── 4. 按钮 ─────────────────────────────── */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55rem;
  padding:.92rem 1.6rem;border-radius:100px;font-size:.94rem;font-weight:600;
  letter-spacing:.01em;position:relative;overflow:hidden;white-space:nowrap;
  transition:transform .45s var(--spring),box-shadow .4s var(--ease),background .3s var(--ease);
  will-change:transform;
}
.btn:active{transform:scale(.97)}
.btn--sm{padding:.6rem 1.15rem;font-size:.86rem}
.btn--full{width:100%}
.btn--gold{
  background:linear-gradient(135deg,var(--gold-hi),var(--gold) 45%,var(--gold-dp));
  color:#1a1206;box-shadow:0 12px 34px -14px rgba(232,106,37,.9),inset 0 1px 0 rgba(255,255,255,.45);
}
.btn--gold::after{
  content:"";position:absolute;inset:0;transform:translateX(-120%) skewX(-18deg);
  background:linear-gradient(90deg,transparent,rgba(255,255,255,.55),transparent);width:55%;
}
.btn--gold:hover::after{animation:sweep 1s var(--ease)}
@keyframes sweep{to{transform:translateX(320%) skewX(-18deg)}}
.btn--gold:hover{box-shadow:0 18px 44px -14px rgba(232,106,37,1),inset 0 1px 0 rgba(255,255,255,.5)}
.btn--glass,.btn--ghost{
  background:rgba(255,255,255,.055);border:1px solid rgba(255,255,255,.14);
  color:var(--sand-050);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}
.btn--glass:hover,.btn--ghost:hover{background:rgba(255,255,255,.1);border-color:rgba(232,106,37,.5)}
.btn__spin{display:none;width:16px;height:16px;border-radius:50%;
  border:2px solid rgba(26,18,6,.28);border-top-color:#1a1206;animation:spin .7s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}
.btn.is-busy .btn__label{opacity:.55}
.btn.is-busy .btn__spin{display:block}

/* ── 5. 导航（液态玻璃 · 3%磨砂 + 焦散折射） ─────── */
.nav{position:fixed;top:0;left:0;right:0;z-index:50;transition:all .5s var(--ease)}
.nav__inner{
  width:min(100% - 2.5rem,var(--maxw));margin:.9rem auto;padding:.6rem .6rem .6px 1rem;
  display:flex;align-items:center;gap:1.4rem;border-radius:100px;
  background:linear-gradient(158deg,rgba(255,255,255,.06),rgba(255,255,255,.02));
  border:1px solid rgba(255,255,255,.10);
  -webkit-backdrop-filter:blur(3px) saturate(110%) brightness(1.03);backdrop-filter:blur(3px) saturate(110%) brightness(1.03);
  box-shadow:none;
  transition:all .5s var(--ease);
  position:relative;overflow:hidden;
}
/* ── 液态玻璃焦散（可见的多光源折射光斑） ── */
.nav__inner::before{
  content:"";position:absolute;inset:-4px;z-index:0;
  background:
    radial-gradient(160px 80px at 18% 25%,rgba(232,106,37,.18),transparent 70%),
    radial-gradient(140px 65px at 72% 55%,rgba(95,158,147,.14),transparent 70%),
    radial-gradient(110px 55px at 45% 80%,rgba(255,255,255,.12),transparent 70%),
    linear-gradient(165deg,rgba(255,255,255,.05),transparent 35%,rgba(255,255,255,.03) 55%,transparent 80%);
  animation:nav-caustic 14s ease-in-out infinite alternate;
  pointer-events:none;border-radius:inherit;
}
@keyframes nav-caustic{
  0%{transform:translateX(-4%) translateY(1.5%) rotate(.6deg);opacity:.7}
  33%{transform:translateX(2.5%) translateY(-1.5%) rotate(-.4deg);opacity:1}
  66%{transform:translateX(-1%) translateY(2.5%) rotate(.3deg);opacity:.85}
  100%{transform:translateX(3%) translateY(-.5%) rotate(-.5deg);opacity.75}
}
/* ── 折射高光线（明亮扫光） ── */
.nav__inner::after{
  content:"";position:absolute;top:0;left:8%;right:30%;height:1.5px;z-index:2;
  background:linear-gradient(90deg,transparent 0%,rgba(255,255,255,.40) 25%,rgba(255,255,255,.60) 45%,rgba(255,255,255,.28) 70%,transparent 100%);
  animation:nav-sheen 7s ease-in-out infinite;
  pointer-events:none;
  box-shadow:0 0 18px 4px rgba(255,255,255,.15);
}
@keyframes nav-sheen{
  0%,100%{left:8%;right:35%;opacity:.35}
  40%{left:28%;right:8%;opacity:.95}
  70%{left:45%;right:15%;opacity:.60}
}
.nav.is-stuck .nav__inner{
  background:linear-gradient(158deg,rgba(14,18,22,.70),rgba(14,18,22,.55));
  border-color:rgba(255,255,255,.08);box-shadow:0 18px 40px -24px rgba(0,0,0,.7),inset 0 1px 0 rgba(255,255,255,.08);
}
.brand{display:flex;align-items:center;gap:.7rem;flex-shrink:0}
.brand__mark{display:grid;place-items:center;transition:transform .6s var(--spring)}
.brand:hover .brand__mark{transform:rotate(-8deg) scale(1.06)}
.brand__text{display:flex;flex-direction:column;line-height:1.25}
.brand__text b{font-family:var(--font-num);font-size:.98rem;letter-spacing:.14em;font-weight:600}
.brand__text i{font-style:normal;font-size:.68rem;color:var(--sand-400);letter-spacing:.04em}
.nav__links{display:flex;gap:.15rem;margin-left:auto}
.nav__links a{
  padding:.5rem .82rem;font-size:.88rem;color:var(--sand-200);border-radius:100px;
  position:relative;transition:color .3s var(--ease),background .3s var(--ease);
}
.nav__links a::after{
  content:"";position:absolute;left:50%;bottom:.28rem;width:0;height:2px;border-radius:2px;
  background:var(--gold);transform:translateX(-50%);transition:width .4s var(--ease);
}
.nav__links a:hover{color:var(--sand-050);background:rgba(255,255,255,.05)}
.nav__links a:hover::after,.nav__links a.is-active::after{width:16px}
.nav__links a.is-active{color:var(--gold-hi)}
.nav__toggle{display:none;width:42px;height:42px;border-radius:50%;
  border:1px solid rgba(255,255,255,.14);flex-direction:column;align-items:center;justify-content:center;gap:5px}
.nav__toggle span{width:16px;height:1.6px;background:var(--sand-050);border-radius:2px;transition:transform .4s var(--ease)}
.nav__toggle[aria-expanded="true"] span:first-child{transform:translateY(3.3px) rotate(45deg)}
.nav__toggle[aria-expanded="true"] span:last-child{transform:translateY(-3.3px) rotate(-45deg)}
.nav__drawer{
  display:none;flex-direction:column;gap:.2rem;width:min(100% - 2.5rem,var(--maxw));
  margin:0 auto;padding:.8rem;border-radius:var(--r-lg);
  background:rgba(14,18,22,.94);border:1px solid rgba(255,255,255,.1);
  -webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);
  opacity:0;transform:translateY(-8px);transition:opacity .35s var(--ease),transform .35s var(--ease);
}
.nav__drawer a{padding:.72rem .9rem;border-radius:12px;font-size:.94rem;color:var(--sand-200)}
.nav__drawer a:hover{background:rgba(255,255,255,.06);color:var(--gold-hi)}
.nav__drawer.is-open{display:flex;opacity:1;transform:translateY(0)}
@media(max-width:960px){
  .nav__links,.nav .btn--ghost{display:none}
  .nav__toggle{display:flex;margin-left:auto}
  .nav__inner{margin-bottom:.4rem}
}

/* ── 6. 通用排版 ─────────────────────────── */
.section{position:relative;z-index:2;padding:clamp(5rem,10vw,8.5rem) 0}
.section--alt::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,transparent,rgba(255,255,255,.014) 22%,rgba(255,255,255,.014) 78%,transparent);
}
.sec-head{max-width:820px;margin-bottom:clamp(2.6rem,5vw,4rem)}
.sec-head--split{
  max-width:none;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.05fr);
  gap:clamp(1.5rem,4vw,4rem);align-items:end;
}
@media(max-width:860px){.sec-head--split{grid-template-columns:1fr}}
.kicker{
  display:inline-flex;align-items:center;gap:.5rem;font-size:.74rem;font-weight:600;
  letter-spacing:.22em;text-transform:uppercase;color:var(--gold);margin-bottom:1rem;
}
.kicker::before{content:"";width:26px;height:1px;background:linear-gradient(90deg,transparent,var(--gold))}
.sec-head h2{font-size:clamp(1.85rem,4.2vw,3.15rem);margin-bottom:1rem}
.sec-head h2 em{font-style:normal;color:var(--gold-hi);position:relative}
.sec-head h2 em::after{
  content:"";position:absolute;left:0;right:0;bottom:.08em;height:.34em;border-radius:3px;z-index:-1;
  background:linear-gradient(90deg,rgba(232,106,37,.22),rgba(232,106,37,0));
}
.sec-lede{color:var(--sand-200);font-size:clamp(.98rem,1.5vw,1.08rem);max-width:66ch;line-height:1.85}
.sec-lede b{color:var(--sand-050);font-weight:600}
.src-tag{
  display:inline-block;margin-top:.9rem;font-size:.71rem;color:var(--sand-600);
  letter-spacing:.02em;border-left:2px solid rgba(232,106,37,.35);padding-left:.55rem;
}
.honest{
  display:block;font-size:.85rem;color:var(--sand-400);line-height:1.75;
  border-left:2px solid rgba(95,158,147,.55);padding-left:.8rem;margin-top:1rem;
}
.honest b{color:var(--jade);font-weight:600}
.honest--block{
  border-left:none;padding:1.15rem 1.4rem;border-radius:var(--r-md);margin-top:1.8rem;
  background:linear-gradient(120deg,rgba(95,158,147,.10),rgba(95,158,147,.02));
  border:1px solid rgba(95,158,147,.2);font-size:.9rem;
}
.num{font-family:var(--font-num);font-variant-numeric:tabular-nums;font-weight:600;letter-spacing:-.01em}

/* ── 7. 揭示动画 ─────────────────────────── */
.reveal{opacity:0;transform:translateY(26px);
  transition:opacity .95s var(--ease),transform .95s var(--ease);
  transition-delay:calc(var(--d,0) * 90ms);will-change:transform,opacity}
.reveal.is-in{opacity:1;transform:none}

@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;
    transition-duration:.01ms !important;scroll-behavior:auto !important}
  .reveal{opacity:1;transform:none}
  .aurora,.grain{animation:none}
  #particles{display:none}
}