/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Helvetica Neue", Arial, sans-serif;
}

/* Hero Section */
.hero {
    position: relative;
    width: 100%;
    min-height: 100vh;      /* ★ 允许高度超过屏幕 */
    overflow: visible;      /* ★ 允许向下滚动 */
    background: #000;
}

/* Background Image */
.hero-bg {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    z-index: 0;
}

/* Dark Overlay */
.overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.45);
    z-index: 1;
}

/* Logo */
.logo img {
    width: 180px;
    margin: 20px;
    z-index: 2;
    position: relative;
}

/* Main Content */
.hero-content {
    position: relative;
    z-index: 2;
    width: 100%;
    max-width: 700px;
    margin: 80px auto 0;
    padding: 0 20px;
    text-align: center;
}

.hero-content h1 {
    font-size: 2.4rem;
    font-weight: 700;
    color: #fff;
}

.subtitle {
    margin-top: 10px;
    font-size: 1.1rem;
    color: #fff;
    opacity: 0.9;
}

/* Signup Box */
.signup-box {
    margin: 40px auto 0;
    background: rgba(0, 0, 0, 0.55);
    padding: 25px 25px 35px;
    border-radius: 6px;
    display: inline-block;
    text-align: center;
}

.signup-box h2 {
    margin-bottom: 20px;
    font-size: 1.8rem;
    color: #fff;
}

.highlight {
    color: #ff2bac;
}

/* Buttons */
.btn {
    display: block;
    width: 260px;
    padding: 15px 0;
    margin: 12px auto;
    font-size: 1.2rem;
    font-weight: bold;
    border-radius: 6px;
    text-decoration: none;
    color: #fff;
}

.btn.woman { background: #ff2bac; }
.btn.man { background: #0a6dff; }

/* Steps */
.steps {
    position: relative;
    margin-top: 40px;        /* spacing under signup box */
    width: 100%;
    display: flex;
    justify-content: center;
    gap: 50px;
    z-index: 2;
}

.step-item {
    text-align: center;
    max-width: 200px;
    color: #fff;
}

.circle {
    width: 55px;
    height: 55px;
    background: rgba(255,255,255,0.32);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 10px;
    font-size: 1.4rem;
}

/* Footer */
footer {
    position: relative;
    width: 100%;
    margin-top: 40px;        /* ensures footer below steps */
    padding: 20px;
    color: #fff;
    z-index: 2;

    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
}

.footer-link {
    color: #fff;
    text-decoration: none;
}

/* Mobile Responsive */
@media (max-width: 768px) {

    .hero-content h1 {
        font-size: 1.9rem;
    }

    .signup-box {
        width: 90%;
    }

    .steps {
        display: none; /* hide steps for mobile */
    }

    .logo img {
        width: 150px;
    }

    footer {
        justify-content: center;
        flex-direction: column;
        gap: 5px;
    }
}

@media (max-width: 480px) {

    .hero-content {
        margin-top: 60px;
    }

    .hero-content h1 {
        font-size: 1.6rem;
    }

    .signup-box h2 {
        font-size: 1.5rem;
    }

    .btn {
        width: 100%;
    }
}