/* ============================================================
   HDDI · ChatGPT 会员充值  —  样式表
   主题：深色高级感 + 青绿/紫渐变 + 玻璃拟态
   ============================================================ */

:root{
  --bg:        #07080d;
  --bg-soft:   #0d1018;
  --panel:     rgba(255,255,255,.04);
  --panel-2:   rgba(255,255,255,.06);
  --border:    rgba(255,255,255,.09);
  --border-2:  rgba(255,255,255,.16);
  --text:      #eef1f6;
  --muted:     #9aa3b2;
  --faint:     #6b7382;

  --teal:   #10a37f;
  --green:  #19c37d;
  --cyan:   #2dd4bf;
  --purple: #8b5cf6;

  --grad: linear-gradient(120deg,#19c37d 0%,#10a37f 45%,#2dd4bf 100%);
  --grad-soft: linear-gradient(120deg,rgba(25,195,125,.18),rgba(45,212,191,.10));

  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 24px 60px -24px rgba(0,0,0,.7);
  --shadow-glow: 0 0 0 1px rgba(25,195,125,.35), 0 20px 60px -20px rgba(16,163,127,.55);

  --font: "Sora","PingFang SC","Microsoft YaHei",-apple-system,system-ui,sans-serif;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font);
  background:var(--bg);
  color:var(--text);
  line-height:1.6;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
img{max-width:100%;display:block}
.container{width:min(1140px,92%);margin-inline:auto}
.section{padding:96px 0}

/* ---------- 通用渐变文字 ---------- */
.gradient-text{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.4em;
  font:inherit;font-weight:600;font-size:.98rem;
  padding:.85em 1.6em;border-radius:999px;cursor:pointer;border:1px solid transparent;
  transition:transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s;
  white-space:nowrap;
}
.btn--primary{background:var(--grad);color:#04130d;box-shadow:0 12px 30px -10px rgba(25,195,125,.6)}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 18px 40px -10px rgba(25,195,125,.8)}
.btn--ghost{background:var(--panel);color:var(--text);border-color:var(--border-2)}
.btn--ghost:hover{transform:translateY(-2px);border-color:var(--green);background:var(--panel-2)}
.btn--block{width:100%}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  padding:16px 0;transition:background .3s, padding .3s, border-color .3s;
  border-bottom:1px solid transparent;
}
.nav.scrolled{
  background:rgba(7,8,13,.78);backdrop-filter:blur(14px);
  border-bottom-color:var(--border);padding:10px 0;
}
.nav__inner{display:flex;align-items:center;justify-content:space-between;gap:24px}
.brand{display:flex;align-items:center;gap:10px}
.brand__logo{height:40px;width:auto;background:#fff;border-radius:8px;padding:4px 9px;display:block}
.brand__name{font-weight:800;font-size:1.4rem;letter-spacing:.5px;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.brand__sub{font-size:.78rem;color:var(--muted);border-left:1px solid var(--border-2);padding-left:10px}
.nav__menu{display:flex;align-items:center;gap:30px}
.nav__menu a{font-size:.95rem;color:var(--muted);transition:color .2s}
.nav__menu a:hover{color:var(--text)}
.nav__menu .nav__cta{
  color:var(--text);border:1px solid var(--border-2);padding:.5em 1.2em;border-radius:999px;
  transition:border-color .2s,background .2s;
}
.nav__menu .nav__cta:hover{border-color:var(--green);background:var(--panel)}
.nav__toggle{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.nav__toggle span{width:24px;height:2px;background:var(--text);border-radius:2px;transition:.3s}

/* ---------- 主视觉 ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;overflow:hidden;padding:120px 0 80px}
.hero__bg{position:absolute;inset:0;z-index:0}
.blob{position:absolute;border-radius:50%;filter:blur(90px);opacity:.55;animation:float 18s ease-in-out infinite}
.blob--1{width:520px;height:520px;background:radial-gradient(circle,#10a37f,transparent 70%);top:-120px;left:-80px}
.blob--2{width:460px;height:460px;background:radial-gradient(circle,#8b5cf6,transparent 70%);bottom:-140px;right:-60px;animation-delay:-6s}
.blob--3{width:380px;height:380px;background:radial-gradient(circle,#2dd4bf,transparent 70%);top:40%;left:55%;animation-delay:-11s}
@keyframes float{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(40px,-30px) scale(1.08)}66%{transform:translate(-30px,25px) scale(.95)}}
.grid-overlay{position:absolute;inset:0;
  background-image:linear-gradient(rgba(255,255,255,.03) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.03) 1px,transparent 1px);
  background-size:56px 56px;
  mask-image:radial-gradient(ellipse 70% 60% at 50% 40%,#000 30%,transparent 80%);
  -webkit-mask-image:radial-gradient(ellipse 70% 60% at 50% 40%,#000 30%,transparent 80%);
}
.hero__inner{position:relative;z-index:1;text-align:center;max-width:880px;margin-inline:auto}
.hero__badge{display:inline-block;font-size:.85rem;color:var(--green);
  background:var(--grad-soft);border:1px solid rgba(25,195,125,.3);
  padding:.5em 1.1em;border-radius:999px;margin-bottom:26px}
.hero__title{font-size:clamp(2.1rem,5.4vw,4rem);font-weight:800;line-height:1.18;letter-spacing:-.5px}
.hero__title .line{display:block}
.hero__title .hl{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.rotator{display:inline-block;position:relative;min-width:2.5em;text-align:left;vertical-align:bottom}
.rotator span{
  background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
  border-right:2px solid var(--green);padding-right:2px;animation:caret 1s step-end infinite;
}
@keyframes caret{50%{border-color:transparent}}
.hero__desc{margin:26px auto 36px;color:var(--muted);font-size:1.08rem;max-width:620px}
.hero__cta{display:flex;gap:16px;justify-content:center;flex-wrap:wrap}
.hero__stats{display:flex;gap:44px;justify-content:center;margin-top:58px;flex-wrap:wrap}
.stat{display:flex;flex-direction:column}
.stat b{font-size:2rem;font-weight:800;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.stat span{font-size:.85rem;color:var(--faint)}
.hero__scroll{position:absolute;bottom:28px;left:50%;transform:translateX(-50%);z-index:1}
.mouse{display:block;width:24px;height:38px;border:2px solid var(--border-2);border-radius:14px;position:relative}
.mouse span{position:absolute;top:7px;left:50%;transform:translateX(-50%);width:4px;height:7px;border-radius:2px;background:var(--green);animation:scrolldot 1.6s infinite}
@keyframes scrolldot{0%{opacity:0;top:7px}40%{opacity:1}80%{opacity:0;top:18px}}

/* ---------- 信任标签 ---------- */
.trust{padding:64px 0;border-top:1px solid var(--border);border-bottom:1px solid var(--border);background:var(--bg-soft)}
.trust__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.trust__item{text-align:center;padding:8px}
.trust__ico{font-size:2rem;margin-bottom:10px}
.trust__item h4{font-size:1.05rem;margin-bottom:4px}
.trust__item p{color:var(--muted);font-size:.9rem}

/* ---------- 区块标题 ---------- */
.section__head{text-align:center;max-width:680px;margin:0 auto 56px}
.eyebrow{display:inline-block;font-size:.8rem;letter-spacing:2px;text-transform:uppercase;color:var(--green);margin-bottom:14px}
.section__head h2{font-size:clamp(1.7rem,3.6vw,2.6rem);font-weight:800;letter-spacing:-.5px}
.section__head p{color:var(--muted);margin-top:14px}

/* ---------- 套餐卡片 ---------- */
.plans__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch}
.plan{
  position:relative;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);
  padding:34px 30px;display:flex;flex-direction:column;
  transition:transform .3s, border-color .3s, box-shadow .3s;
}
.plan:hover{transform:translateY(-6px);border-color:var(--border-2);box-shadow:var(--shadow)}
.plan--featured{border-color:rgba(25,195,125,.45);box-shadow:var(--shadow-glow);background:linear-gradient(180deg,rgba(25,195,125,.08),var(--panel))}
.plan--featured:hover{transform:translateY(-10px)}
.plan__flag{position:absolute;top:-13px;left:50%;transform:translateX(-50%);
  background:var(--grad);color:#04130d;font-size:.78rem;font-weight:700;padding:.35em 1em;border-radius:999px;white-space:nowrap}
.plan__head h3{font-size:1.35rem;font-weight:700}
.plan__tag{color:var(--muted);font-size:.88rem;margin-top:4px}
.plan__price{display:flex;align-items:flex-end;gap:2px;margin:22px 0 4px}
.plan__price .cur{font-size:1.3rem;font-weight:600;color:var(--green);margin-bottom:6px}
.plan__price .num{font-size:3rem;font-weight:800;line-height:1}
.plan__price .per{color:var(--muted);font-size:1rem;margin-bottom:8px}
.plan__feat{list-style:none;margin:22px 0 28px;display:flex;flex-direction:column;gap:12px;flex:1}
.plan__feat li{position:relative;padding-left:26px;font-size:.95rem;color:var(--text)}
.plan__feat li::before{content:"✓";position:absolute;left:0;top:0;color:var(--green);font-weight:800}
.plan__feat b{color:var(--cyan)}
.plans__note{text-align:center;color:var(--faint);font-size:.88rem;margin-top:34px}

/* ---------- 流程 ---------- */
.process__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}
.step{position:relative;background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:34px 28px;overflow:hidden}
.step__no{font-size:3.2rem;font-weight:800;opacity:.16;line-height:1;background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;-webkit-text-fill-color:transparent}
.step h4{font-size:1.2rem;margin:10px 0 8px}
.step p{color:var(--muted);font-size:.95rem}

/* ---------- 下单表单 ---------- */
.order{background:var(--bg-soft);border-top:1px solid var(--border)}
.order__inner{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.order__intro h2{font-size:clamp(1.6rem,3.2vw,2.3rem);font-weight:800;margin:12px 0 14px}
.order__intro p{color:var(--muted)}
.order__points{list-style:none;margin-top:24px;display:flex;flex-direction:column;gap:12px}
.order__points li{color:var(--text);font-size:.96rem}
.order__form{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:34px;box-shadow:var(--shadow)}
.field{margin-bottom:18px}
.field label{display:block;font-size:.9rem;color:var(--muted);margin-bottom:8px}
.field input,.field select,.field textarea{
  width:100%;background:rgba(0,0,0,.25);border:1px solid var(--border-2);border-radius:var(--radius-sm);
  color:var(--text);font:inherit;font-size:.96rem;padding:.85em 1em;transition:border-color .2s, box-shadow .2s;resize:vertical;
}
.field input::placeholder,.field textarea::placeholder{color:var(--faint)}
.field input:focus,.field select:focus,.field textarea:focus{outline:none;border-color:var(--green);box-shadow:0 0 0 3px rgba(25,195,125,.15)}
.field select{appearance:none;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' fill='%239aa3b2' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 1em center}
.field option{background:#0d1018;color:var(--text)}
.order__hint{margin-top:14px;font-size:.9rem;min-height:1.2em;text-align:center}
.order__hint.ok{color:var(--green)}
.order__hint.err{color:#ff6b6b}

/* ---------- 扫码卡片 ---------- */
.qrcard{
  background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);
  padding:34px;text-align:center;box-shadow:var(--shadow);max-width:380px;margin-inline:auto;width:100%;
}
.qrcard__qr{
  position:relative;width:240px;height:240px;margin:0 auto 20px;border-radius:16px;overflow:hidden;
  background:#fff;display:flex;align-items:center;justify-content:center;padding:10px;
  box-shadow:0 0 0 6px rgba(25,195,125,.12);
}
.qrcard__qr img{width:100%;height:100%;object-fit:contain}
.qrcard__ph{display:none;color:#555;font-size:.95rem;line-height:1.5}
.qrcard__ph small{color:#999;font-size:.8rem}
.qrcard__qr--empty img{display:none}
.qrcard__qr--empty .qrcard__ph{display:block}
.qrcard__title{font-size:1.15rem;font-weight:700}
.qrcard__wx{margin-top:8px;color:var(--muted)}
.qrcard__wx b{color:var(--cyan);font-size:1.05rem;letter-spacing:.5px}
.qrcard__tip{font-size:.85rem;color:var(--faint);margin:8px 0 22px}

/* ---------- 评价 ---------- */
.reviews__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px}
.review{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:26px}
.review blockquote{font-size:1rem;line-height:1.7}
.review figcaption{margin-top:16px;color:var(--faint);font-size:.88rem}

/* ---------- 为什么选我们 ---------- */
.why__grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px}
.why__card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius);padding:28px 24px;transition:border-color .3s,transform .3s}
.why__card:hover{border-color:var(--border-2);transform:translateY(-4px)}
.why__card h4{font-size:1.1rem;margin-bottom:10px}
.why__card p{color:var(--muted);font-size:.93rem}

/* ---------- FAQ ---------- */
.faq__list{max-width:780px;margin-inline:auto;display:flex;flex-direction:column;gap:14px}
.faq__item{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-sm);padding:4px 22px;transition:border-color .25s}
.faq__item[open]{border-color:var(--border-2)}
.faq__item summary{list-style:none;cursor:pointer;font-weight:600;padding:16px 0;position:relative;padding-right:30px}
.faq__item summary::-webkit-details-marker{display:none}
.faq__item summary::after{content:"+";position:absolute;right:0;top:14px;font-size:1.4rem;color:var(--green);transition:transform .25s}
.faq__item[open] summary::after{transform:rotate(45deg)}
.faq__item p{color:var(--muted);padding:0 0 18px;font-size:.95rem}

/* ---------- 底部 CTA ---------- */
.cta-band{padding:80px 0;text-align:center;background:radial-gradient(ellipse 60% 100% at 50% 0%,rgba(25,195,125,.12),transparent)}
.cta-band__inner h2{font-size:clamp(1.7rem,3.6vw,2.6rem);font-weight:800}
.cta-band__inner p{color:var(--muted);margin:14px 0 28px}

/* ---------- 页脚 ---------- */
.footer{border-top:1px solid var(--border);background:var(--bg-soft)}
.footer__inner{display:flex;justify-content:space-between;align-items:center;gap:30px;padding:48px 0;flex-wrap:wrap}
.footer__brand p{color:var(--muted);font-size:.9rem;margin-top:6px}
.footer__links{display:flex;gap:26px;flex-wrap:wrap}
.footer__links a{color:var(--muted);font-size:.92rem;transition:color .2s}
.footer__links a:hover{color:var(--text)}
.footer__bar{border-top:1px solid var(--border);padding:22px 0}
.footer__bar p{color:var(--faint);font-size:.82rem;text-align:center}
.footer__bar .disclaimer{margin-bottom:6px}

/* ---------- 浮动客服 ---------- */
.kefu{position:fixed;right:22px;bottom:22px;z-index:90}
.kefu__btn{display:flex;flex-direction:column;align-items:center;gap:2px;
  background:var(--grad);color:#04130d;border:0;border-radius:50%;width:62px;height:62px;cursor:pointer;
  box-shadow:0 12px 30px -8px rgba(25,195,125,.7);transition:transform .25s;font-weight:700}
.kefu__btn:hover{transform:scale(1.06)}
.kefu__icon{font-size:1.3rem}
.kefu__label{font-size:.7rem}
.kefu__panel{
  position:absolute;right:0;bottom:74px;width:230px;background:#10141d;border:1px solid var(--border-2);
  border-radius:var(--radius);padding:20px;text-align:center;box-shadow:var(--shadow);
  opacity:0;visibility:hidden;transform:translateY(10px) scale(.96);transform-origin:bottom right;transition:.25s;
}
.kefu.open .kefu__panel{opacity:1;visibility:visible;transform:translateY(0) scale(1)}
.kefu__panel h4{font-size:.98rem;margin-bottom:14px}
.kefu__qr{position:relative;width:170px;height:170px;margin:0 auto 14px;border-radius:12px;overflow:hidden;background:#fff;display:flex;align-items:center;justify-content:center}
.kefu__qr img{width:100%;height:100%;object-fit:contain}
.kefu__qr-ph{display:none;color:#555;font-size:.85rem;line-height:1.4}
.kefu__qr--empty img{display:none}
.kefu__qr--empty .kefu__qr-ph{display:block}
.kefu__wx{font-size:.9rem;color:var(--muted)}
.kefu__wx b{color:var(--text)}
.kefu__tip{font-size:.8rem;color:var(--faint);margin-top:6px}

/* ---------- 滚动揭示动画 ---------- */
.reveal{opacity:0;transform:translateY(30px);transition:opacity .7s cubic-bezier(.2,.7,.2,1),transform .7s cubic-bezier(.2,.7,.2,1)}
.reveal.in{opacity:1;transform:none}
[data-reveal-words]{overflow:hidden}
[data-reveal-words] .w{display:inline-block;transform:translateY(110%);transition:transform .7s cubic-bezier(.2,.7,.2,1)}
[data-reveal-words].in .w{transform:none}

/* ---------- 响应式 ---------- */
@media(max-width:920px){
  .plans__grid,.process__grid,.reviews__grid{grid-template-columns:1fr 1fr}
  .why__grid,.trust__grid{grid-template-columns:1fr 1fr}
  .order__inner{grid-template-columns:1fr;gap:36px}
}
@media(max-width:680px){
  .section{padding:72px 0}
  .nav__menu{position:fixed;top:0;right:0;height:100vh;width:74%;max-width:320px;
    flex-direction:column;align-items:flex-start;gap:22px;background:#0b0e15;
    padding:96px 32px;transform:translateX(100%);transition:transform .35s;border-left:1px solid var(--border)}
  .nav__menu.open{transform:none}
  .nav__toggle{display:flex;z-index:101}
  .nav.open .nav__toggle span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .nav.open .nav__toggle span:nth-child(2){opacity:0}
  .nav.open .nav__toggle span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .plans__grid,.process__grid,.reviews__grid,.why__grid{grid-template-columns:1fr}
  .hero__stats{gap:30px}
  .footer__inner{flex-direction:column;text-align:center;align-items:center}
}