/* ==== 基础重置 ==== */
html, body {
    height: 100%;
    width: 100%;
    margin: 0;
    padding: 0;
}

* {
    box-sizing: border-box;
}

body {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    font-family: "SF Pro Display", "SF Pro SC", "PingFang SC", "Helvetica Neue", "Microsoft Yahei", BlinkMacSystemFont, -apple-system, "Segoe UI", Roboto, Ubuntu, sans-serif;
    font-weight: 400;
    color: #333;
    background: #f8f6f2;
    overflow-x: hidden;
}

a {
    transition: all 0.3s ease;
    text-decoration: none;
}

/* ==== 顶部导航 ==== */
.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 0 60px;
    height: 72px;
    transition: background 0.4s, box-shadow 0.4s;
    display: flex;
    align-items: center;
}

.top-nav.scrolled {
    background: rgba(255, 252, 248, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 0 rgba(255,140,66,0.12);
}

.nav-inner {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    font-size: 20px;
    font-weight: 700;
    color: #2a1000;
    letter-spacing: 2px;
}

.nav-links a {
    color: rgba(42,16,0,0.55);
    font-size: 15px;
    margin-left: 36px;
    font-weight: 500;
    letter-spacing: 0.5px;
}

.nav-links a:hover {
    color: #FF8C42;
}

/* ==== Hero 全屏 ==== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(160deg, #fff8f0 0%, #ffefe0 30%, #fff5ea 60%, #fff0e0 100%);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.hero-glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
}

.hero-glow-1 {
    width: 700px;
    height: 700px;
    top: -200px;
    right: -150px;
    background: radial-gradient(circle, #FF5E00 0%, rgba(255,94,0,0.3) 30%, rgba(255,106,0,0.1) 55%, transparent 70%);
    animation: hero-glow-drift 12s ease-in-out infinite alternate;
}

.hero-glow-2 {
    width: 500px;
    height: 500px;
    bottom: -100px;
    left: -50px;
    background: radial-gradient(circle, #FF8C42 0%, rgba(255,140,66,0.25) 30%, rgba(255,140,66,0.08) 55%, transparent 70%);
    animation: hero-glow-drift 10s ease-in-out infinite alternate-reverse;
}

.hero-glow-3 {
    width: 400px;
    height: 400px;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, #FF6A00 0%, rgba(255,106,0,0.15) 40%, transparent 65%);
    animation: hero-glow-drift 14s ease-in-out 3s infinite alternate;
}

@keyframes hero-glow-drift {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(30px, -20px) scale(1.1); }
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,140,66,0.06) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,140,66,0.06) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: radial-gradient(ellipse at 50% 50%, black 40%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at 50% 50%, black 40%, transparent 70%);
}

.hero-body {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: 80px 24px 100px;
    max-width: 900px;
}

.hero-eyebrow {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 5px;
    color: rgba(255,94,0,0.65);
    margin-bottom: 32px;
}

.hero-title {
    font-size: 64px;
    font-weight: 800;
    color: #2a1000;
    margin: 0 0 28px;
    letter-spacing: 4px;
    line-height: 1.15;
    background: linear-gradient(180deg, #2a1000 30%, #FF6A00 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-lead {
    font-size: 18px;
    color: rgba(42,16,0,0.55);
    line-height: 1.9;
    margin: 0 auto 24px;
    max-width: 640px;
}

.hero-mode {
    font-size: 15px;
    color: rgba(42,16,0,0.35);
    letter-spacing: 3px;
    margin-bottom: 48px;
}

.hero-action {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.btn-hero {
    display: inline-block;
    background: linear-gradient(135deg, #FF9A45, #FF5E00);
    color: #fff;
    padding: 16px 52px;
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 2px;
    border-radius: 40px;
    text-transform: uppercase;
    transition: all 0.35s ease;
    box-shadow: 0 8px 30px rgba(255,94,0,0.35);
}

.btn-hero:hover {
    transform: translateY(-2px);
    box-shadow: 0 14px 40px rgba(255,94,0,0.5);
    color: #fff;
}

.btn-hero-ghost {
    display: inline-block;
    color: rgba(42,16,0,0.6);
    padding: 16px 52px;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: 2px;
    border-radius: 40px;
    border: 1.5px solid rgba(255,140,66,0.35);
    text-transform: uppercase;
    transition: all 0.35s ease;
}

.btn-hero-ghost:hover {
    color: #FF8C42;
    border-color: rgba(255,140,66,0.6);
    background: rgba(255,106,0,0.08);
}

/* 向下滚动提示 */
.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
}

.hero-scroll span {
    display: block;
    width: 22px;
    height: 36px;
    border: 2px solid rgba(255,140,66,0.35);
    border-radius: 12px;
    position: relative;
}

.hero-scroll span::after {
    content: '';
    position: absolute;
    top: 7px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: rgba(255,140,66,0.7);
    border-radius: 2px;
    animation: scroll-bob 2s ease-in-out infinite;
}

@keyframes scroll-bob {
    0%, 100% { top: 7px; opacity: 0.3; }
    50% { top: 18px; opacity: 0.8; }
}

/* ==== 滚动入场动画 ==== */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 错开动画延迟 */
.flow-header.reveal { transition-delay: 0s; }
.flow-cards.reveal { transition-delay: 0.2s; }
.fund-track.reveal { transition-delay: 0.4s; }

.hero-body .reveal:nth-child(1) { transition-delay: 0s; }
.hero-body .reveal:nth-child(2) { transition-delay: 0.1s; }
.hero-body .reveal:nth-child(3) { transition-delay: 0.2s; }
.hero-body .reveal:nth-child(4) { transition-delay: 0.3s; }
.hero-body .reveal:nth-child(5) { transition-delay: 0.4s; }
.hero-body .reveal:nth-child(6) { transition-delay: 0.5s; }

/* ==== 业务模式区 ==== */
.flow-section {
    background: #f8f6f2;
    padding: 120px 0 110px;
    position: relative;
}

.flow-container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 30px;
}

.flow-header {
    text-align: center;
    margin-bottom: 80px;
}

.flow-title {
    font-size: 42px;
    font-weight: 800;
    color: #2a1000;
    margin: 0 0 16px;
    letter-spacing: 2px;
}

.flow-sub {
    font-size: 17px;
    color: #8888a0;
    margin: 0;
}

/* 三卡片 + 连接线 */
.flow-cards {
    display: flex;
    align-items: stretch;
    justify-content: center;
    gap: 0;
    margin-bottom: 80px;
}

.flow-card {
    flex: 1;
    max-width: 280px;
    background: #ffffff;
    border-radius: 20px;
    padding: 48px 28px 40px;
    text-align: center;
    position: relative;
    transition: all 0.4s ease;
    border: 1px solid rgba(255,140,66,0.06);
    box-shadow: 0 4px 24px rgba(0,0,0,0.03);
}

.flow-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 24px 50px rgba(255,94,0,0.08);
}

.flow-card-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    position: absolute;
    top: 22px;
    left: 50%;
    transform: translateX(-50%);
}

.flow-card-a .flow-card-dot { background: #FF5E00; }
.flow-card-b .flow-card-dot { background: #FF8C42; }
.flow-card-c .flow-card-dot { background: #FFB347; }

.flow-card-label {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 16px;
    letter-spacing: 2px;
}

.flow-card-a .flow-card-label { color: #FF5E00; }
.flow-card-b .flow-card-label { color: #FF8C42; }
.flow-card-c .flow-card-label { color: #FFB347; }

.flow-card h3 {
    font-size: 21px;
    font-weight: 700;
    color: #2a1000;
    margin: 0 0 8px;
}

.flow-card-role {
    font-size: 13px;
    color: #b0b0c0;
    margin-bottom: 16px;
    letter-spacing: 1px;
}

.flow-card p {
    font-size: 15px;
    color: #666680;
    line-height: 1.7;
    margin: 0;
}

/* 卡片连接器 */
.flow-card-connector {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0 16px;
    min-width: 60px;
}

.flow-connector-line {
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, #FF8C42, transparent);
}

.flow-connector-arrow {
    font-size: 22px;
    color: #FF6A00;
    margin-top: 6px;
    font-weight: 300;
}

/* 资金流向 */
.fund-track {
    background: #ffffff;
    border-radius: 20px;
    border: 1px solid rgba(255,140,66,0.06);
    padding: 50px 40px 40px;
    text-align: center;
    box-shadow: 0 4px 24px rgba(0,0,0,0.03);
}

.fund-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0;
    margin-bottom: 30px;
}

.fund-step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
}

.fund-step-num {
    font-size: 13px;
    color: #b0b0c0;
    font-weight: 600;
}

.fund-step-text {
    font-size: 16px;
    color: #2a1000;
    font-weight: 600;
}

.fund-step-arrow {
    font-size: 24px;
    color: #d5d5ea;
    padding: 0 8px;
}

.fund-step-arrow.return {
    color: #FF6A00;
}

.fund-note {
    font-size: 15px;
    color: #8888a0;
}

/* ==== 页脚 ==== */
.footer {
    background: #f8f6f2;
    padding: 38px 20px;
    text-align: center;
    color: rgba(42,16,0,0.35);
    border-top: 1px solid rgba(255,140,66,0.08);
}

.footer p {
    font-size: 14px;
    margin: 0;
}

.footer a {
    color: rgba(42,16,0,0.45);
}

.footer a:hover {
    color: #FF8C42;
}

.footer-tagline {
    margin-top: 8px !important;
    font-size: 13px !important;
    color: rgba(42,16,0,0.25) !important;
}

/* ==== 响应式 ==== */
@media (max-width: 1024px) {
    .hero-title { font-size: 48px; }
    .flow-cards { flex-wrap: wrap; gap: 24px; }
    .flow-card { max-width: calc(50% - 12px); flex: 0 0 auto; }
    .flow-card-connector { display: none; }
    .fund-steps { gap: 12px; }
}

@media (max-width: 768px) {
    .top-nav { padding: 0 24px; height: 60px; }
    .nav-brand { font-size: 17px; letter-spacing: 1px; }
    .nav-links a { margin-left: 20px; font-size: 14px; }
    .hero-title { font-size: 34px; letter-spacing: 2px; }
    .hero-lead { font-size: 15px; }
    .hero-lead br { display: none; }
    .hero-mode { font-size: 13px; letter-spacing: 2px; }
    .btn-hero, .btn-hero-ghost { padding: 14px 36px; font-size: 13px; }
    .flow-section { padding: 80px 0 70px; }
    .flow-header { margin-bottom: 50px; }
    .flow-title { font-size: 30px; }
    .flow-card { max-width: 100%; flex: 1 1 100%; }
    .flow-cards { flex-direction: column; align-items: center; gap: 20px; }
    .fund-track { padding: 36px 20px 30px; }
    .fund-steps { flex-direction: column; gap: 8px; }
    .fund-step-arrow { transform: rotate(90deg); font-size: 20px; }
    .hero-scroll { bottom: 28px; }
}

@media (max-width: 480px) {
    .top-nav { padding: 0 16px; }
    .hero-title { font-size: 26px; }
    .hero-lead { font-size: 14px; }
    .hero { min-height: 100vh; min-height: 100dvh; }
}