:root {
    --bg: #0f0f0f;
    --bg-elevated: #171717;
    --gold: #d4af6e;
    --gold-light: #e8c78a;
    --cream: #f5f0e8;
    --cream-muted: rgba(245,240,232,0.65);
    --cream-subtle: rgba(245,240,232,0.35);
    --radius: 16px;
    --transition: all 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
    background: var(--bg);
    color: var(--cream);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section { padding: 120px 0; }
.section__eyebrow {
    font-size: 12px;
    letter-spacing: 0.35em;
    color: var(--gold);
    text-transform: uppercase;
    margin-bottom: 16px;
}
.section__title {
    font-size: clamp(32px, 5vw, 52px);
    font-weight: 300;
    line-height: 1.2;
    letter-spacing: 0.04em;
    margin-bottom: 20px;
}
.section__subtitle { color: var(--cream-muted); font-size: 16px; }
.section__desc { color: var(--cream-muted); font-size: 16px; line-height: 1.9; max-width: 520px; }
.section__header { text-align: center; margin-bottom: 64px; }

.navbar {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: var(--transition);
}
.navbar.scrolled { background: rgba(15,15,15,0.92); backdrop-filter: blur(12px); padding: 14px 0; }
.nav__inner { display: flex; align-items: center; justify-content: space-between; }
.nav__brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: var(--cream); }
.nav__mark {
    width: 42px; height: 34px;
    border: 1px solid var(--gold);
    color: var(--gold);
    display: grid; place-items: center;
    font-size: 13px;
    letter-spacing: 0.05em;
}
.nav__brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.nav__title { font-size: 15px; letter-spacing: 0.15em; }
.nav__subtitle { font-size: 11px; color: var(--cream-muted); letter-spacing: 0.15em; }
.nav__links { display: flex; gap: 40px; }
.nav__links a {
    color: var(--cream-muted);
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 0.1em;
    transition: var(--transition);
}
.nav__links a:hover { color: var(--gold); }

.hero {
    position: relative;
    min-height: 100vh;
    display: grid; place-items: center;
    text-align: center;
    isolation: isolate;
    overflow: hidden;
}
.hero__bg {
    position: absolute; inset: 0;
    background: url("../assets/bincui.png") center/cover no-repeat;
    filter: brightness(0.42) saturate(0.75);
    z-index: -3;
}
.hero__overlay {
    position: absolute; inset: 0;
    background: linear-gradient(135deg, rgba(15,15,15,0.92) 0%, rgba(15,15,15,0.45) 50%, rgba(60,45,25,0.55) 100%);
    z-index: -2;
}
.hero__glow {
    position: absolute; top: -15%; right: -10%;
    width: 55vw; height: 55vw;
    background: radial-gradient(circle, rgba(212,175,110,0.16) 0%, transparent 60%);
    filter: blur(80px);
    z-index: -1;
}
.hero__content { max-width: 880px; padding: 0 24px; }
.hero__kicker {
    font-size: 12px;
    letter-spacing: 0.4em;
    color: var(--gold);
    text-transform: uppercase;
    margin-bottom: 16px;
}
.hero__community {
    display: inline-block;
    padding: 8px 20px;
    border: 1px solid rgba(212,175,110,0.45);
    color: var(--gold-light);
    font-size: 13px;
    letter-spacing: 0.25em;
    margin-bottom: 24px;
}
.hero__title {
    font-size: clamp(44px, 9vw, 92px);
    font-weight: 300;
    letter-spacing: 0.12em;
    line-height: 1.12;
    margin-bottom: 28px;
}
.hero__title span { display: block; font-weight: 500; color: var(--gold-light); }
.hero__subtitle { font-size: clamp(16px, 2.2vw, 22px); color: var(--cream-muted); font-weight: 300; letter-spacing: 0.1em; margin-bottom: 56px; }
.hero__cta {
    display: inline-flex;
    padding: 16px 44px;
    border: 1px solid rgba(212,175,110,0.6);
    color: var(--gold-light);
    text-decoration: none;
    font-size: 14px;
    letter-spacing: 0.2em;
    transition: var(--transition);
}
.hero__cta:hover { background: rgba(212,175,110,0.12); border-color: var(--gold-light); }
.hero__qrcode {
    position: absolute;
    bottom: 48px; right: 48px;
    text-align: center;
}
.hero__qrcode img { width: 120px; height: 120px; border-radius: 12px; background: #fff; padding: 8px; box-shadow: 0 8px 32px rgba(0,0,0,0.4); }
.hero__qrcode p { margin-top: 12px; font-size: 12px; color: var(--cream-muted); letter-spacing: 0.1em; }
.hero__hint { position: absolute; bottom: 48px; left: 48px; font-size: 12px; color: var(--cream-subtle); letter-spacing: 0.15em; writing-mode: vertical-rl; }

.about { background: var(--bg); }
.about__grid { display: grid; grid-template-columns: 1fr 1fr; gap: 80px; align-items: center; }
.about__visual { position: relative; }
.about__image {
    width: 100%; height: 520px;
    background: url("../assets/bincui.png") center/cover no-repeat;
    filter: saturate(0.8) brightness(0.85);
    border-radius: var(--radius);
}
.about__card {
    position: absolute;
    bottom: -24px; left: -24px;
    background: var(--bg-elevated);
    border: 1px solid rgba(212,175,110,0.25);
    padding: 28px 32px;
    border-radius: var(--radius);
}
.about__card-num { display: block; font-size: 32px; color: var(--gold); font-weight: 300; margin-bottom: 8px; }
.about__card p { font-size: 14px; color: var(--cream-muted); line-height: 1.8; }

.features { background: var(--bg-elevated); }
.features__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card {
    background: var(--bg);
    border: 1px solid rgba(245,240,232,0.08);
    border-radius: var(--radius);
    padding: 40px 28px;
    transition: var(--transition);
}
.feature-card:hover { border-color: rgba(212,175,110,0.35); transform: translateY(-6px); }
.feature-card__num { font-size: 13px; color: var(--gold); letter-spacing: 0.15em; margin-bottom: 24px; display: block; }
.feature-card h3 { font-size: 20px; font-weight: 400; margin-bottom: 14px; letter-spacing: 0.05em; }
.feature-card p { font-size: 14px; color: var(--cream-muted); line-height: 1.8; }

.experience { position: relative; padding: 160px 0; isolation: isolate; }
.experience__bg {
    position: absolute; inset: 0;
    background: url("../assets/bincui.png") center/cover fixed no-repeat;
    filter: brightness(0.35) saturate(0.7);
    z-index: -2;
}
.experience::before { content: ""; position: absolute; inset: 0; background: rgba(15,15,15,0.72); z-index: -1; }
.experience__content { max-width: 900px; margin: 0 auto; text-align: center; }
.experience__quote {
    font-size: clamp(26px, 4vw, 42px);
    font-weight: 300;
    line-height: 1.4;
    color: var(--cream);
    margin: 32px 0 64px;
}
.experience__items { display: grid; grid-template-columns: repeat(3, 1fr); gap: 40px; }
.experience__item h4 { font-size: 16px; font-weight: 400; color: var(--gold); margin-bottom: 12px; letter-spacing: 0.1em; }
.experience__item p { font-size: 14px; color: var(--cream-muted); line-height: 1.8; }

.join { background: var(--bg); }
.join__inner {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 80px;
    align-items: center;
    max-width: 900px;
    margin: 0 auto;
    padding: 64px;
    border: 1px solid rgba(212,175,110,0.2);
    border-radius: var(--radius);
}
.join__qrcode { text-align: center; }
.join__qrcode img { width: 160px; height: 160px; border-radius: 16px; background: #fff; padding: 10px; box-shadow: 0 12px 40px rgba(0,0,0,0.3); }
.join__qrcode p { margin-top: 16px; font-size: 13px; color: var(--cream-muted); letter-spacing: 0.1em; }

.footer { padding: 40px 0; background: #080808; text-align: center; }
.footer p { font-size: 13px; color: var(--cream-subtle); letter-spacing: 0.05em; }

[data-reveal] { opacity: 0; transform: translateY(36px); transition: opacity 0.8s ease, transform 0.8s ease; }
[data-reveal].is-visible { opacity: 1; transform: translateY(0); }

@media (max-width: 1024px) {
    .features__grid { grid-template-columns: repeat(2, 1fr); }
    .about__grid { gap: 48px; }
    .join__inner { gap: 48px; padding: 48px; }
}
@media (max-width: 768px) {
    .section { padding: 80px 0; }
    .nav__links { display: none; }
    .hero__qrcode { right: 50%; transform: translateX(50%); bottom: 32px; }
    .hero__hint { display: none; }
    .hero__content { padding-bottom: 180px; }
    .about__grid { grid-template-columns: 1fr; }
    .about__image { height: 360px; }
    .about__card { left: 16px; bottom: -16px; padding: 20px 24px; }
    .features__grid { grid-template-columns: 1fr; }
    .experience__items { grid-template-columns: 1fr; gap: 32px; }
    .join__inner { grid-template-columns: 1fr; text-align: center; padding: 40px 24px; }
    .join__qrcode img { width: 140px; height: 140px; }
}