/* roulang page: index */
:root {
  --ink: #0b1020;
  --inklight: #141a33;
  --gold: #c9a35f;
  --gold-deep: #a8823e;
  --bg: #f7f5f2;
  --surface: #ffffff;
  --text: #1e2330;
  --muted: #64748b;
  --border: #e5e0d8;
  --radius: 16px;
  --shadow: 0 10px 30px rgba(2,6,23,0.08);
  --shadow-lg: 0 24px 50px rgba(2,6,23,0.14);
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:110px}
body{font-family:'PingFang SC','Hiragino Sans GB','Microsoft YaHei','Helvetica Neue',Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.7;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block;height:auto}
a{text-decoration:none;color:inherit}
button,input,select,textarea{font-family:inherit}
.container-x{max-width:1280px;margin:0 auto;padding:0 20px}
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;font-weight:600;border-radius:9999px;transition:all .25s ease;cursor:pointer;border:1px solid transparent}
.btn-sm{padding:.5rem 1.25rem;font-size:.875rem}
.btn-lg{padding:.875rem 2rem;font-size:1rem}
.btn-gold{background:var(--gold);color:#141a2a;border-color:var(--gold)}
.btn-gold:hover{background:var(--gold-deep);border-color:var(--gold-deep);transform:translateY(-2px);box-shadow:0 14px 28px rgba(201,163,95,.35)}
.btn-gold:active{transform:translateY(0)}
.btn-ghost{border-color:rgba(255,255,255,.55);color:#fff;background:transparent}
.btn-ghost:hover{background:rgba(255,255,255,.12);border-color:#fff;transform:translateY(-2px)}
.btn-ghost:active{transform:translateY(0)}
.card{background:var(--surface);border-radius:var(--radius);border:1px solid var(--border);box-shadow:var(--shadow);transition:transform .3s ease,box-shadow .3s ease}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}
.section-tag{display:inline-block;padding:.375rem 1.1rem;font-size:.75rem;letter-spacing:.18em;text-transform:uppercase;color:var(--gold-deep);background:rgba(201,163,95,.12);border-radius:9999px;margin-bottom:1rem;font-weight:700}
.section-tag.light{color:var(--gold);background:rgba(201,163,95,.16)}
.nav-link{display:inline-flex;align-items:center;height:2.75rem;padding:0 1.1rem;font-size:.875rem;color:#cbd5e1;border-bottom:2px solid transparent;transition:color .2s,border-color .2s;white-space:nowrap;font-weight:500}
.nav-link:hover{color:#fff}
.nav-link.active{color:var(--gold);border-bottom-color:var(--gold);font-weight:600}
.icon-box{width:52px;height:52px;border-radius:14px;background:linear-gradient(135deg,rgba(201,163,95,.18),rgba(201,163,95,.06));border:1px solid rgba(201,163,95,.28);display:flex;align-items:center;justify-content:center;color:var(--gold-deep);font-size:1.35rem;margin-bottom:1rem;transition:all .3s}
.card:hover .icon-box{background:var(--gold);color:#141a2a;transform:rotate(-6deg) scale(1.05)}
.timeline-item{position:relative;padding:1.5rem;background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.1);border-radius:16px;transition:border-color .3s,background .3s}
.timeline-item:hover{border-color:rgba(201,163,95,.5);background:rgba(255,255,255,.07)}
.timeline-item::before{content:'';position:absolute;top:1.6rem;left:-8px;width:16px;height:16px;border-radius:50%;background:var(--gold);border:3px solid #0b1020}
.rank-item{display:flex;align-items:center;gap:1rem;padding:1rem 0;border-bottom:1px dashed var(--border)}
.rank-item:last-child{border-bottom:none}
.rank-num{width:36px;height:36px;flex-shrink:0;border-radius:10px;background:rgba(201,163,95,.14);color:var(--gold-deep);font-weight:700;font-size:.9rem;display:flex;align-items:center;justify-content:center}
.rank-item:nth-child(1) .rank-num{background:var(--gold);color:#141a2a}
.rank-bar{height:6px;border-radius:99px;background:linear-gradient(90deg,var(--gold),var(--gold-deep));transition:width .6s ease}
.bubble{position:relative;background:#fff;border-radius:18px;padding:1.25rem;border:1px solid var(--border);box-shadow:var(--shadow)}
.bubble::after{content:'';position:absolute;bottom:-10px;left:32px;width:0;height:0;border-left:10px solid transparent;border-right:10px solid transparent;border-top:10px solid #fff}
.faq-item{border:1px solid var(--border);border-radius:14px;background:#fff;overflow:hidden;transition:box-shadow .25s,border-color .25s}
.faq-item[open]{box-shadow:var(--shadow);border-color:rgba(201,163,95,.4)}
.faq-item summary{cursor:pointer;padding:1.25rem 3rem 1.25rem 1.5rem;font-weight:600;list-style:none;position:relative;color:#1e2330}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'\2b';position:absolute;right:1.5rem;top:50%;transform:translateY(-50%);font-size:1.25rem;color:var(--gold);transition:transform .25s}
.faq-item[open] summary::after{content:'\2212'}
.faq-answer{padding:0 1.5rem 1.25rem;color:var(--muted);line-height:1.75;border-top:1px solid var(--border);margin-top:.25rem}
.footer-link{color:#94a3b8;font-size:.875rem;transition:color .2s}
.footer-link:hover{color:var(--gold)}
.hero-section{position:relative;background-size:cover;background-position:center}
.hero-section::before{content:'';position:absolute;inset:0;background:linear-gradient(180deg,rgba(11,16,32,.82),rgba(11,16,32,.68))}
.partner-logo{width:44px;height:44px;border-radius:12px;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.12);display:flex;align-items:center;justify-content:center;font-size:1rem;color:#cbd5e1;font-weight:600}
.form-input{width:100%;padding:.85rem 1rem;border-radius:12px;border:1px solid rgba(255,255,255,.2);background:rgba(255,255,255,.06);color:#fff;transition:border-color .2s,background .2s;font-size:.925rem}
.form-input::placeholder{color:#94a3b8}
.form-input:focus{outline:none;border-color:var(--gold);background:rgba(255,255,255,.1)}
.form-select{appearance:none;background-image:linear-gradient(45deg,transparent 50%,#c9a35f 50%),linear-gradient(135deg,#c9a35f 50%,transparent 50%);background-position:calc(100% - 20px) 50%,calc(100% - 15px) 50%;background-size:5px 5px;background-repeat:no-repeat}
.avatar{width:44px;height:44px;border-radius:50%;background:linear-gradient(135deg,#c9a35f,#a8823e);display:flex;align-items:center;justify-content:center;color:#141a2a;font-weight:700;font-size:.875rem;flex-shrink:0}
.scrollbar-hide::-webkit-scrollbar{display:none}
.scrollbar-hide{scrollbar-width:none}
@media (max-width:640px){
  .nav-link{padding:0 .8rem}
  .timeline-item::before{left:-5px;width:12px;height:12px}
}
@media (max-width:520px){
  html{scroll-padding-top:100px}
  .hero-section h1{font-size:1.65rem}
  .hero-section p{font-size:.95rem}
  .btn-lg{padding:.75rem 1.4rem;font-size:.9rem}
}