/* ================= 1. 核心变量 ================= */
:root {
    --primary-color: #1d1d1f;
    --accent-color: #0071e3;
    --bg-glass: rgba(255, 255, 255, 0.55);
    --text-secondary: #86868b;
    --radius-main: 16px;
    --radius-btn: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --bg-fallback: linear-gradient(180deg, #fbfaf7 0%, #f5f1e9 100%);
}

body {
    font-family: var(--font-sans);
    background: var(--bg-fallback);
    display: flex; justify-content: center; align-items: center;
    min-height: 100vh; padding: 20px; overflow: hidden; position: relative;
    -webkit-font-smoothing: antialiased;
}

/* ================= 2. 背景图 + 颗粒质感 ================= */
.page-bg {
    position: fixed; inset: 0; z-index: 0; overflow: hidden;
    background: var(--bg-fallback);
}

.page-bg-image,
.page-bg-overlay,
.page-bg-grain {
    position: absolute;
    inset: 0;
}

.page-bg-image {
    inset: -6%;
    width: 112%;
    height: 112%;
    background-size: cover;
    background-position: center;
    transform: scale(1.03);
    opacity: 0;
    transition: opacity 1.4s ease;
    will-change: opacity;
}

.page-bg-image.is-visible {
    opacity: 1;
}

.page-bg-overlay {
    background:
        radial-gradient(
            ellipse at center,
            rgba(255, 255, 255, 0) 0%,
            rgba(244, 239, 231, 0.12) 40%,
            rgba(233, 226, 215, 0.2) 58%,
            rgba(221, 213, 200, 0.28) 74%,
            rgba(205, 197, 185, 0.42) 100%
        ),
        linear-gradient(to bottom, rgba(255, 251, 245, 0.08), rgba(228, 220, 209, 0.24));
}

.page-bg-grain {
    opacity: 0.18;
    pointer-events: none;
    background-image:
        radial-gradient(circle at 20% 20%, rgba(255,255,255,0.18) 0 1px, transparent 1.5px),
        radial-gradient(circle at 70% 30%, rgba(255,255,255,0.12) 0 1px, transparent 1.8px),
        radial-gradient(circle at 40% 80%, rgba(120,96,72,0.12) 0 1px, transparent 1.6px),
        radial-gradient(circle at 85% 65%, rgba(120,96,72,0.1) 0 1px, transparent 1.8px);
    background-size: 110px 110px, 145px 145px, 130px 130px, 170px 170px;
    mix-blend-mode: soft-light;
    animation: grain-drift 8s steps(6) infinite;
}

@keyframes grain-drift {
    0% { transform: translate3d(0, 0, 0); }
    25% { transform: translate3d(-1.8%, 1.2%, 0); }
    50% { transform: translate3d(1.2%, -1.8%, 0); }
    75% { transform: translate3d(1.8%, 1.8%, 0); }
    100% { transform: translate3d(0, 0, 0); }
}

/* ================= 3. 主容器 ================= */
.main-container {
    position: relative; z-index: 2;
    background: var(--bg-glass);
    backdrop-filter: blur(50px) saturate(1.6);
    -webkit-backdrop-filter: blur(50px) saturate(1.6);
    border: none;
    width: 100%; max-width: 1050px; border-radius: 28px;
    display: flex; overflow: hidden;
    box-shadow: inset 0 0 0 0.5px rgba(255, 255, 255, 0.38);
}

.carousel-section {
    flex: 0 0 42%; position: relative; background: #0a0a0a; overflow: hidden;
    min-height: 520px;
}
.slide {
    position: absolute; inset: 0; opacity: 0;
    transition: opacity 1.4s ease;
}
.slide.active { opacity: 1; }
.slide img {
    width: 100%; height: 100%; object-fit: cover; display: block;
}

/* 轮播指示器 */
.carousel-indicators {
    position: absolute; bottom: 20px; left: 50%;
    transform: translateX(-50%);
    display: flex; gap: 8px; z-index: 2;
}
.carousel-dot {
    width: 7px; height: 7px; border-radius: 50%;
    background: rgba(255, 255, 255, 0.35);
    border: none; cursor: pointer; padding: 0;
    transition: all 0.4s ease;
}
.carousel-dot.active {
    background: rgba(255, 255, 255, 0.95);
    width: 22px; border-radius: 4px;
}

/* ================= 5. 右侧落地页内容 ================= */
.content-section {
    flex: 1; padding: 48px; display: flex; flex-direction: column;
    justify-content: center; gap: 32px;
}

/* --- 品牌区 --- */
.brand { display: flex; flex-direction: column; gap: 8px; }
.brand-title {
    font-size: 48px; font-weight: 700; color: var(--primary-color);
    letter-spacing: -0.02em; line-height: 1.1;
}
.brand-sub {
    font-size: 16px; color: var(--text-secondary); line-height: 1.5;
    max-width: 340px;
}

/* --- CTA 按钮 --- */
.cta-group { display: flex; flex-wrap: wrap; gap: 10px; }

.btn {
    padding: 12px 28px; border-radius: var(--radius-btn); border: none;
    font-size: 14px; font-weight: 600; cursor: pointer; transition: var(--transition);
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    text-decoration: none; letter-spacing: 0.01em;
}
.btn-primary {
    background: var(--primary-color); color: white;
}
.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(0,0,0,0.2);
}
.btn-primary:active { transform: translateY(0); box-shadow: none; }

.btn-secondary {
    background: rgba(255,255,255,0.4); color: var(--primary-color);
    padding-inline: 20px;
}
.btn-secondary:hover { background: rgba(255,255,255,0.6); }
.btn-secondary:active { background: rgba(255,255,255,0.7); }

/* --- 信息卡片组 --- */
.info-cards { display: flex; flex-direction: column; gap: 8px; }

.info-card {
    background: rgba(255, 255, 255, 0.35);
    border: none; border-radius: var(--radius-main);
    padding: 14px 16px;
    display: flex; align-items: center; gap: 14px;
    transition: var(--transition);
}
.info-card:hover {
    background: rgba(255, 255, 255, 0.55);
}
.card-icon {
    width: 38px; height: 38px; border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 17px; flex-shrink: 0;
}
.card-icon-green { background: rgba(221, 243, 228, 0.8); }
.card-icon-blue  { background: rgba(225, 240, 255, 0.8); }
.card-icon-amber { background: rgba(254, 243, 199, 0.8); }
.card-text h4 {
    font-size: 14px; color: var(--primary-color); font-weight: 600; line-height: 1.3;
}
.card-text p {
    font-size: 12px; color: var(--text-secondary); margin-top: 1px; line-height: 1.4;
}

/* ================= 6. 响应式 ================= */
@media (max-width: 850px) {
    body { padding: 12px; align-items: flex-start; overflow-y: auto; }
    .main-container { flex-direction: column; border-radius: 22px; }
    .carousel-section { min-height: 240px; flex: none; }
    .content-section { padding: 32px 28px; gap: 24px; }
    .brand-title { font-size: 36px; }
    .brand-sub { font-size: 14px; }
}

@media (max-width: 480px) {
    body { padding: 8px; }
    .main-container { border-radius: 18px; }
    .content-section { padding: 24px 20px; gap: 20px; }
    .brand-title { font-size: 30px; }
    .cta-group { flex-direction: column; }
    .cta-group .btn { width: 100%; }
}