/* ============================================
   CSS变量定义 - 增强版
   ============================================ */
:root {
    /* 基础色彩 */
    --bw-bg-primary: #ffffff;
    --bw-bg-secondary: #f8fafc;
    --bw-bg-card: #ffffff;
    --bw-text-primary: #1a202c;
    --bw-text-secondary: #4a5568;
    --bw-text-muted: #a0aec0;
    --bw-border: #e2e8f0;

    /* 主色调 - 渐变蓝紫 */
    --bw-accent: #3b82f6;
    --bw-accent-light: #60a5fa;
    --bw-accent-dark: #2563eb;
    --bw-accent-glow: rgba(59, 130, 246, 0.15);

    /* 辅助色彩 */
    --bw-gradient-start: #3b82f6;
    --bw-gradient-end: #8b5cf6;
    --bw-gradient-purple: #a855f7;
    --bw-gradient-pink: #ec4899;

    /* 阴影 */
    --bw-shadow: rgba(0, 0, 0, 0.06);
    --bw-shadow-hover: rgba(0, 0, 0, 0.1);
    --bw-shadow-glow: rgba(59, 130, 246, 0.3);

    /* 过渡 */
    --bw-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --bw-transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   全局重置与基础
   ============================================ */
.bw-page-wrapper {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--bw-text-primary);
    background: var(--bw-bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 粒子背景容器 */
.bw-particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.bw-particle {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--bw-accent), var(--bw-gradient-end));
    opacity: 0.1;
    animation: particle-float linear infinite;
}

@keyframes particle-float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-20px) rotate(180deg);
    }
}

/* ============================================
   Hero 区域 - 增强版
   ============================================ */
.bw-hero {
    background: linear-gradient(135deg, var(--bw-bg-primary) 0%, var(--bw-bg-secondary) 100%);
    padding: 120px 20px;
    position: relative;
    overflow: hidden;
}

/* 背景装饰 */
.bw-hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 30% 20%, var(--bw-accent-glow) 0%, transparent 50%),
        radial-gradient(circle at 70% 80%, rgba(139, 92, 246, 0.08) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

/* 动态光效 */
.bw-hero::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
        45deg,
        transparent 40%,
        rgba(59, 130, 246, 0.03) 50%,
        transparent 60%
    );
    animation: shimmer 15s linear infinite;
    pointer-events: none;
}

@keyframes shimmer {
    0% {
        transform: translateX(-50%) translateY(-50%) rotate(0deg);
    }
    100% {
        transform: translateX(-50%) translateY(-50%) rotate(360deg);
    }
}

.bw-hero .container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: flex-start;
    gap: 80px;
    position: relative;
    z-index: 1;
}

.bw-hero-content {
    animation: fadeInLeft 1s ease-out;
    flex: 1;
    min-width: 0;
}

.bw-hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: linear-gradient(135deg, var(--bw-accent-glow), transparent);
    border: 1px solid var(--bw-accent);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 500;
    color: var(--bw-accent);
    margin-bottom: 28px;
    position: relative;
    overflow: hidden;
}

.bw-hero-badge::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(59, 130, 246, 0.2), transparent);
    animation: badge-shine 3s ease-in-out infinite;
}

@keyframes badge-shine {
    0%, 100% {
        left: -100%;
    }
    50% {
        left: 100%;
    }
}

.bw-hero-badge svg {
    width: 16px;
    height: 16px;
}

.bw-hero h1 {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 24px;
    color: var(--bw-text-primary);
    letter-spacing: -0.03em;
}

.bw-hero h1 span {
    display: block;
    background: linear-gradient(135deg, var(--bw-accent) 0%, var(--bw-gradient-end) 50%, var(--bw-gradient-purple) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    background-size: 200% auto;
    animation: gradient-shift 4s ease-in-out infinite;
}

@keyframes gradient-shift {
    0%, 100% {
        background-position: 0% center;
    }
    50% {
        background-position: 100% center;
    }
}

.bw-hero-description {
    font-size: 19px;
    color: var(--bw-text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
    max-width: 500px;
}

.bw-hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.bw-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 18px 36px;
    border-radius: 16px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--bw-transition);
    cursor: pointer;
    border: none;
    min-width: 180px;
    position: relative;
    overflow: hidden;
}

.bw-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.bw-btn:hover::before {
    left: 100%;
}

.bw-btn-primary {
    background: linear-gradient(135deg, var(--bw-accent) 0%, var(--bw-accent-dark) 100%);
    color: #ffffff;
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.35);
}

.bw-btn-primary:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 16px 40px rgba(59, 130, 246, 0.45);
}

.bw-btn-secondary {
    background: var(--bw-bg-card);
    color: var(--bw-accent);
    border: 2px solid var(--bw-accent);
}

.bw-btn-secondary:hover {
    background: linear-gradient(135deg, var(--bw-accent), var(--bw-gradient-end));
    color: #ffffff;
    transform: translateY(-4px) scale(1.02);
    box-shadow: 0 12px 32px rgba(59, 130, 246, 0.4);
}

.bw-btn svg {
    width: 22px;
    height: 22px;
}

/* ============================================
   头像区域 - 增强版
   ============================================ */
.bw-hero-visual {
    position: relative;
    flex: 0 0 auto;
    width: 420px;
    height: 420px;
}

.bw-hero-graphic {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%) translateY(-18%);
    width: 340px;
    height: 340px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.bw-avatar-wrapper {
    position: relative;
    margin-bottom: 36px;
}

.bw-avatar-ring {
    position: relative;
    width: 260px;
    height: 260px;
    border-radius: 50%;
    padding: 10px;
    background: linear-gradient(135deg, var(--bw-accent) 0%, var(--bw-gradient-end) 50%, var(--bw-gradient-purple) 100%);
    box-shadow:
        0 20px 60px rgba(59, 130, 246, 0.35),
        0 0 0 4px rgba(59, 130, 246, 0.1);
    animation: avatar-pulse 4s ease-in-out infinite;
}

/* 外圈光环动画 */
.bw-avatar-ring::before {
    content: '';
    position: absolute;
    top: -8px;
    left: -8px;
    right: -8px;
    bottom: -8px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--bw-accent), var(--bw-gradient-end), var(--bw-gradient-purple));
    z-index: -1;
    filter: blur(20px);
    opacity: 0.5;
    animation: ring-glow 3s ease-in-out infinite;
}

@keyframes ring-glow {
    0%, 100% {
        opacity: 0.5;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

/* 旋转光环 */
.bw-avatar-ring::after {
    content: '';
    position: absolute;
    top: -15px;
    left: -15px;
    right: -15px;
    bottom: -15px;
    border-radius: 50%;
    border: 2px dashed rgba(59, 130, 246, 0.3);
    animation: ring-rotate 20s linear infinite;
}

@keyframes ring-rotate {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.bw-avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    background: var(--bw-bg-card);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 5px solid var(--bw-bg-card);
}

.bw-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    border-radius: 50%;
}

.bw-verified-badge {
    position: absolute;
    bottom: 16px;
    right: 16px;
    width: 52px;
    height: 52px;
    background: linear-gradient(135deg, var(--bw-accent) 0%, var(--bw-gradient-end) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--bw-bg-card);
    box-shadow: 0 6px 20px rgba(59, 130, 246, 0.4);
    animation: badge-bounce 2s ease-in-out infinite;
}

@keyframes badge-bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-5px);
    }
}

.bw-verified-badge svg {
    width: 26px;
    height: 26px;
    color: white;
}

.bw-avatar-info {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: var(--bw-bg-card);
    border: 2px solid var(--bw-accent);
    border-radius: 100px;
    box-shadow: 0 10px 30px var(--bw-shadow);
    animation: info-float 3s ease-in-out infinite;
}

@keyframes info-float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-8px);
    }
}

.bw-avatar-info svg {
    width: 20px;
    height: 20px;
    color: var(--bw-accent);
}

.bw-avatar-info span {
    font-size: 15px;
    font-weight: 700;
    color: var(--bw-accent);
}

/* 浮动元素 - 增强 */
.bw-float-element {
    position: absolute;
    background: var(--bw-bg-card);
    border: 2px solid var(--bw-border);
    border-radius: 18px;
    padding: 18px 28px;
    box-shadow: 0 16px 40px var(--bw-shadow);
    display: flex;
    align-items: center;
    gap: 16px;
    font-size: 14px;
    font-weight: 600;
    color: var(--bw-text-primary);
    backdrop-filter: blur(10px);
    transition: var(--bw-transition);
}

.bw-float-element:hover {
    transform: translateY(-8px) scale(1.05);
    box-shadow: 0 24px 50px var(--bw-shadow-hover);
    border-color: var(--bw-accent);
}

.bw-float-element.element-1 {
    top: 0;
    right: -20px;
    animation: float-1 4s ease-in-out infinite;
    border-left: 4px solid var(--bw-accent);
}

.bw-float-element.element-2 {
    bottom: 30%;
    left: -30px;
    animation: float-2 4s ease-in-out infinite 0.5s;
    border-left: 4px solid var(--bw-gradient-purple);
}

@keyframes float-1 {
    0%, 100% {
        transform: translateY(0) rotate(3deg);
    }
    50% {
        transform: translateY(-15px) rotate(-3deg);
    }
}

@keyframes float-2 {
    0%, 100% {
        transform: translateY(0) rotate(-3deg);
    }
    50% {
        transform: translateY(-12px) rotate(3deg);
    }
}

.bw-float-element svg {
    width: 28px;
    height: 28px;
    color: var(--bw-accent);
}

/* ============================================
   功能特性栏 - 增强版
   ============================================ */
.bw-features {
    background: linear-gradient(180deg, var(--bw-bg-secondary) 0%, var(--bw-bg-primary) 100%);
    padding: 80px 20px;
    position: relative;
    overflow: hidden;
}

.bw-features::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--bw-accent), transparent);
}

.bw-features .container {
    max-width: 1200px;
    margin: 0 auto;
}

.bw-features-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 28px;
}

.bw-feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 36px 20px;
    background: var(--bw-bg-card);
    border: 2px solid var(--bw-border);
    border-radius: 24px;
    transition: var(--bw-transition);
    position: relative;
    overflow: hidden;
}

/* 顶部渐变条 */
.bw-feature-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--bw-accent), var(--bw-gradient-end), var(--bw-gradient-purple));
    transform: scaleX(0);
    transition: var(--bw-transition);
}

.bw-feature-item:hover {
    transform: translateY(-10px) scale(1.02);
    box-shadow: 0 24px 50px var(--bw-shadow-hover);
    border-color: var(--bw-accent);
}

.bw-feature-item:hover::before {
    transform: scaleX(1);
}

.bw-feature-icon {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--bw-accent-glow), transparent);
    border: 2px solid var(--bw-accent);
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 22px;
    transition: var(--bw-transition);
}

.bw-feature-item:hover .bw-feature-icon {
    background: linear-gradient(135deg, var(--bw-accent), var(--bw-accent-dark));
    transform: rotate(10deg) scale(1.1);
    border-color: transparent;
}

.bw-feature-icon svg {
    width: 30px;
    height: 30px;
    color: var(--bw-accent);
    transition: var(--bw-transition);
}

.bw-feature-item:hover .bw-feature-icon svg {
    color: white;
}

.bw-feature-title {
    font-size: 16px;
    font-weight: 700;
    color: var(--bw-text-primary);
    margin-bottom: 8px;
}

.bw-feature-desc {
    font-size: 13px;
    color: var(--bw-text-muted);
}

/* ============================================
   关于我们区域 - 增强版
   ============================================ */
.bw-about {
    padding: 120px 20px;
    background: var(--bw-bg-primary);
    position: relative;
}

.bw-about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100%;
    background:
        radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.03) 0%, transparent 50%);
    pointer-events: none;
}

.bw-about .container {
    max-width: 1200px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.bw-section-header {
    text-align: center;
    margin-bottom: 70px;
}

.bw-section-tag {
    display: inline-block;
    padding: 10px 24px;
    background: linear-gradient(135deg, var(--bw-accent-glow), transparent);
    border: 2px solid var(--bw-accent);
    border-radius: 100px;
    font-size: 14px;
    font-weight: 600;
    color: var(--bw-accent);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 2px;
    position: relative;
}

.bw-section-tag::before {
    content: '';
    position: absolute;
    top: 50%;
    left: -60px;
    width: 50px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--bw-accent));
}

.bw-section-tag::after {
    content: '';
    position: absolute;
    top: 50%;
    right: -60px;
    width: 50px;
    height: 2px;
    background: linear-gradient(90deg, var(--bw-accent), transparent);
}

.bw-section-title {
    font-size: 44px;
    font-weight: 800;
    color: var(--bw-text-primary);
    margin-bottom: 20px;
    letter-spacing: -0.02em;
    position: relative;
}

.bw-section-desc {
    font-size: 18px;
    color: var(--bw-text-secondary);
    max-width: 680px;
    margin: 0 auto;
    line-height: 1.8;
}

.bw-about-grid {
    display: grid;
    grid-template-columns: 1.6fr 1fr;
    gap: 36px;
}

.bw-about-card {
    background: var(--bw-bg-card);
    border: 2px solid var(--bw-border);
    border-radius: 28px;
    padding: 52px;
    transition: var(--bw-transition);
    position: relative;
    overflow: hidden;
}

/* 顶部渐变条 */
.bw-about-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--bw-accent), var(--bw-gradient-end), var(--bw-gradient-purple));
}

.bw-about-card:hover {
    box-shadow: 0 30px 70px var(--bw-shadow-hover);
    transform: translateY(-8px);
    border-color: var(--bw-accent);
}

.bw-about-card-primary {
    background: linear-gradient(135deg, var(--bw-bg-card) 0%, var(--bw-bg-secondary) 100%);
}

.bw-about-card h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--bw-text-primary);
    margin-bottom: 28px;
    display: flex;
    align-items: center;
    gap: 16px;
}

.bw-about-card h3 svg {
    width: 40px;
    height: 40px;
    color: var(--bw-accent);
}

.bw-about-card p {
    font-size: 17px;
    color: var(--bw-text-secondary);
    line-height: 1.9;
    margin-bottom: 24px;
}

.bw-about-card:last-child {
    display: flex;
    flex-direction: column;
    gap: 28px;
}

.bw-about-small-card {
    background: var(--bw-bg-secondary);
    border: 2px solid var(--bw-border);
    border-radius: 22px;
    padding: 36px;
    flex: 1;
    transition: var(--bw-transition);
    position: relative;
    overflow: hidden;
}

/* 左侧渐变条 */
.bw-about-small-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 0;
    background: linear-gradient(180deg, var(--bw-accent), var(--bw-gradient-end));
    transition: var(--bw-transition);
}

.bw-about-small-card:hover {
    background: var(--bw-bg-card);
    box-shadow: 0 20px 50px var(--bw-shadow-hover);
    border-color: var(--bw-accent);
}

.bw-about-small-card:hover::before {
    height: 100%;
}

.bw-about-small-card h4 {
    font-size: 21px;
    font-weight: 600;
    color: var(--bw-text-primary);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.bw-about-small-card h4 svg {
    width: 28px;
    height: 28px;
    color: var(--bw-accent);
}

.bw-about-small-card p {
    font-size: 15px;
    color: var(--bw-text-secondary);
    line-height: 1.8;
    margin-bottom: 0;
}

/* ============================================
   联系方式区域 - 增强版
   ============================================ */
.bw-contact {
    padding: 120px 20px;
    background: linear-gradient(180deg, var(--bw-bg-secondary) 0%, var(--bw-bg-primary) 100%);
    position: relative;
}

.bw-contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--bw-accent), transparent);
}

.bw-contact .container {
    max-width: 1200px;
    margin: 0 auto;
}

.bw-contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 36px;
}

.bw-contact-card {
    background: var(--bw-bg-card);
    border: 2px solid var(--bw-border);
    border-radius: 28px;
    padding: 52px;
    transition: var(--bw-transition);
    position: relative;
    overflow: hidden;
}

.bw-contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--bw-accent), var(--bw-gradient-end));
}

.bw-contact-card:hover {
    box-shadow: 0 30px 70px var(--bw-shadow-hover);
    transform: translateY(-8px);
    border-color: var(--bw-accent);
}

.bw-contact-card h3 {
    font-size: 28px;
    font-weight: 700;
    color: var(--bw-text-primary);
    margin-bottom: 12px;
}

.bw-contact-card > p {
    font-size: 16px;
    color: var(--bw-text-secondary);
    margin-bottom: 36px;
}

.bw-contact-list {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.bw-contact-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 26px;
    background: var(--bw-bg-secondary);
    border: 2px solid var(--bw-border);
    border-radius: 20px;
    transition: var(--bw-transition);
    text-decoration: none;
    color: inherit;
    position: relative;
    overflow: hidden;
}

.bw-contact-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: linear-gradient(180deg, var(--bw-accent), var(--bw-gradient-end));
    transform: scaleY(0);
    transition: var(--bw-transition);
}

.bw-contact-item:hover {
    background: linear-gradient(135deg, var(--bw-accent-glow), transparent);
    border-color: var(--bw-accent);
    transform: translateX(10px);
    box-shadow: 0 10px 30px var(--bw-shadow-hover);
}

.bw-contact-item:hover::before {
    transform: scaleY(1);
}

.bw-contact-icon {
    width: 58px;
    height: 58px;
    background: linear-gradient(135deg, var(--bw-accent), var(--bw-accent-dark));
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--bw-transition);
}

.bw-contact-item:hover .bw-contact-icon {
    transform: rotate(10deg) scale(1.1);
    background: linear-gradient(135deg, var(--bw-gradient-end), var(--bw-gradient-purple));
}

.bw-contact-icon svg {
    width: 26px;
    height: 26px;
    color: white;
}

.bw-contact-info {
    flex: 1;
}

.bw-contact-info h4 {
    font-size: 17px;
    font-weight: 700;
    color: var(--bw-text-primary);
    margin-bottom: 6px;
}

.bw-contact-info p {
    font-size: 14px;
    color: var(--bw-text-muted);
}

.bw-contact-arrow {
    width: 24px;
    height: 24px;
    color: var(--bw-accent);
    opacity: 0;
    transform: translateX(-15px);
    transition: var(--bw-transition);
}

.bw-contact-item:hover .bw-contact-arrow {
    opacity: 1;
    transform: translateX(0);
}

/* 二维码区域 - 增强版 */
.bw-qr-section {
    margin-top: 48px;
    padding-top: 40px;
    border-top: 2px dashed var(--bw-border);
}

.bw-qr-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.bw-qr-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 32px;
    background: linear-gradient(135deg, var(--bw-accent-glow), transparent);
    border: 2px dashed var(--bw-accent);
    border-radius: 20px;
    transition: var(--bw-transition);
}

.bw-qr-item:hover {
    background: var(--bw-accent-glow);
    border-style: solid;
    transform: translateY(-5px);
    box-shadow: 0 16px 40px rgba(59, 130, 246, 0.2);
}

.bw-qr-placeholder {
    width: 140px;
    height: 140px;
    background: linear-gradient(135deg, var(--bw-accent) 0%, var(--bw-gradient-end) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.25);
    overflow: hidden;
}

.bw-qr-placeholder img {
    width: 100%;
    height: 100%;
    border-radius: 16px;
    object-fit: cover;
    transition: var(--bw-transition);
}

.bw-qr-item:hover .bw-qr-placeholder img {
    transform: scale(1.1);
}

.bw-qr-item p {
    font-size: 15px;
    color: var(--bw-text-secondary);
    font-weight: 600;
}

/* ============================================
   滚动动画
   ============================================ */
@keyframes fadeInLeft {
    from {
        opacity: 0;
        transform: translateX(-60px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.bw-visible {
    animation: fadeInUp 0.8s ease-out forwards;
}

/* ============================================
   响应式设计 - 增强版
   ============================================ */

/* 平板端 (≤1024px) */
@media (max-width: 1024px) {
    .bw-hero .container {
        flex-direction: column;
        text-align: center;
        align-items: center;
        gap: 50px;
    }

    .bw-hero-content {
        order: 1;
    }

    .bw-hero-visual {
        order: 2;
        width: 100%;
        height: auto;
    }

    .bw-hero-graphic {
        position: static;
        transform: none;
        width: 280px;
        height: 280px;
    }

    .bw-hero h1 {
        font-size: 44px;
    }

    .bw-hero-buttons {
        justify-content: center;
    }

    .bw-features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .bw-about-grid {
        grid-template-columns: 1fr;
    }

    .bw-contact-grid {
        grid-template-columns: 1fr;
    }
}

/* 大手机端 (≤768px) */
@media (max-width: 768px) {
    .bw-hero {
        padding: 80px 16px;
    }

    .bw-hero h1 {
        font-size: 36px;
    }

    .bw-hero-description {
        font-size: 17px;
    }

    .bw-hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .bw-btn {
        width: 100%;
        max-width: 320px;
    }

    .bw-float-element {
        display: none;
    }

    .bw-avatar-ring {
        width: 220px;
        height: 220px;
    }

    .bw-avatar-wrapper {
        margin-bottom: 28px;
    }

    .bw-verified-badge {
        width: 44px;
        height: 44px;
        bottom: 10px;
        right: 10px;
    }

    .bw-verified-badge svg {
        width: 22px;
        height: 22px;
    }

    .bw-avatar-info {
        padding: 10px 20px;
    }

    .bw-avatar-info span {
        font-size: 14px;
    }

    .bw-features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 18px;
    }

    .bw-feature-item {
        padding: 28px 16px;
    }

    .bw-feature-icon {
        width: 56px;
        height: 56px;
        margin-bottom: 18px;
    }

    .bw-section-title {
        font-size: 32px;
    }

    .bw-about, .bw-contact {
        padding: 80px 16px;
    }

    .bw-about-card {
        padding: 40px 28px;
    }

    .bw-contact-card {
        padding: 40px 28px;
    }

    .bw-about-card h3 {
        font-size: 24px;
    }

    .bw-contact-card h3 {
        font-size: 24px;
    }

    .bw-about-small-card h4 {
        font-size: 19px;
    }

    .bw-contact-info h4 {
        font-size: 16px;
    }

    .bw-qr-grid {
        grid-template-columns: 1fr;
    }
}

/* 小手机端 (≤480px) */
@media (max-width: 480px) {
    .bw-hero h1 {
        font-size: 30px;
    }

    .bw-hero-badge {
        font-size: 13px;
        padding: 8px 16px;
    }

    .bw-features-grid {
        grid-template-columns: 1fr 1fr;
        gap: 14px;
    }

    .bw-feature-title {
        font-size: 14px;
    }

    .bw-section-title {
        font-size: 28px;
    }

    .bw-qr-placeholder {
        width: 120px;
        height: 120px;
    }

    .bw-contact-item {
        padding: 20px;
    }

    .bw-contact-icon {
        width: 50px;
        height: 50px;
    }

    .bw-avatar-ring {
        width: 180px;
        height: 180px;
    }

    .bw-verified-badge {
        width: 40px;
        height: 40px;
        bottom: 5px;
        right: 5px;
        border-width: 3px;
    }

    .bw-verified-badge svg {
        width: 18px;
        height: 18px;
    }

    .bw-avatar-info {
        padding: 8px 16px;
    }

    .bw-avatar-info svg {
        width: 16px;
        height: 16px;
    }

    .bw-avatar-info span {
        font-size: 13px;
    }
}