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

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    background: #000;
    color: #fff;
    overflow: hidden;
}

/* 导航栏 */
nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 48px;
    z-index: 100;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0.5px;
}

.nav-brand img {
    width: 28px;
    height: 28px;
}

.nav-download {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    background: #fff;
    color: #000;
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    border-radius: 999px;
    transition: all 0.3s ease;
}

.nav-download:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(255, 255, 255, 0.25);
}

.nav-download svg {
    width: 16px;
    height: 16px;
}

/* 主内容区 */
main {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 24px;
    position: relative;
}

/* 背景光晕 */
.glow {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(180, 255, 240, 0.08) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    animation: pulse 6s ease-in-out infinite;
    transition: transform 0.3s ease-out;
}

@keyframes pulse {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

.hero-icon {
    width: 120px;
    height: 120px;
    margin-bottom: 32px;
    animation: float 4s ease-in-out infinite;
}

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

h1 {
    font-size: clamp(48px, 8vw, 96px);
    font-weight: 700;
    letter-spacing: -2px;
    line-height: 1.1;
    margin-bottom: 16px;
    background: linear-gradient(180deg, #ffffff 0%, #a0e8d8 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.2s;
}

.subtitle {
    font-size: clamp(18px, 2.5vw, 28px);
    font-weight: 300;
    color: rgba(255, 255, 255, 0.7);
    letter-spacing: 4px;
    margin-bottom: 48px;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.4s;
}

.cta-download {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 16px 40px;
    background: #fff;
    color: #000;
    text-decoration: none;
    font-size: 16px;
    font-weight: 600;
    border-radius: 999px;
    transition: all 0.3s ease;
    opacity: 0;
    transform: translateY(20px);
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.6s;
}

.cta-download:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(255, 255, 255, 0.3);
}

.cta-download svg {
    width: 18px;
    height: 18px;
}

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

/* 页脚 */
footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    text-align: center;
    padding: 24px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.35);
    letter-spacing: 0.5px;
}

/* 响应式 */
@media (max-width: 640px) {
    nav {
        padding: 16px 20px;
    }
    .nav-brand span {
        display: none;
    }
    .hero-icon {
        width: 90px;
        height: 90px;
    }
}

/* 右下角反馈面板 */
.feedback {
    position: fixed;
    bottom: 60px;
    right: 24px;
    z-index: 200;
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 12px;
}

.feedback-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.1);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 999px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    transition: all 0.3s ease;
}

.feedback-toggle:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: translateY(-1px);
}

.feedback-toggle svg {
    width: 16px;
    height: 16px;
}

.feedback-panel {
    width: 280px;
    background: rgba(20, 20, 20, 0.95);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 20px;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    transform: translateY(10px) scale(0.95);
    pointer-events: none;
    transition: all 0.3s ease;
    transform-origin: bottom right;
}

.feedback-panel.active {
    opacity: 1;
    transform: translateY(0) scale(1);
    pointer-events: auto;
}

.feedback-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 4px;
}

.feedback-desc {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    margin-bottom: 16px;
}

.wechat-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.wechat-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 10px;
    transition: background 0.2s ease;
}

.wechat-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.wx-label {
    font-size: 11px;
    color: rgba(255, 255, 255, 0.4);
    background: rgba(255, 255, 255, 0.08);
    padding: 2px 8px;
    border-radius: 4px;
    flex-shrink: 0;
}

.wx-id {
    font-size: 14px;
    font-family: "SF Mono", "Consolas", monospace;
    flex: 1;
    color: #a0e8d8;
}

.wx-copy {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.6);
    cursor: pointer;
    padding: 4px 10px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.08);
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.wx-copy:hover {
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
}

.wx-copy.copied {
    background: #a0e8d8;
    color: #000;
}

@media (max-width: 640px) {
    .feedback {
        bottom: 50px;
        right: 16px;
    }
    .feedback-panel {
        width: 260px;
    }
}