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

body {
    font-family: 'Microsoft YaHei', sans-serif;
    background: linear-gradient(135deg, #0A1128 0%, #1C2541 100%);
    color: #fff;
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    width: 90%;
    max-width: 1400px;
    margin: 0 auto;
}

.main-nav {
    background: rgba(10, 17, 40, 0.98);
    padding: 8px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid rgba(218, 165, 32, 0.2);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.5);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo img {
    height: 90px;
    filter: drop-shadow(0 2px 4px rgba(123, 147, 255, 0.2));
}

.auth-buttons {
    display: flex;
    gap: 15px;
}

.btn-login, .btn-register {
    padding: 12px 35px;
    border-radius: 28px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.4s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-login {
    background: transparent;
    border: 2px solid #DAA520;
    color: #DAA520;
}

.btn-login:hover {
    background: rgba(218, 165, 32, 0.1);
    box-shadow: 0 0 15px rgba(218, 165, 32, 0.2);
}

.btn-register {
    background: linear-gradient(45deg, #DAA520, #B8860B);
    color: #000;
    box-shadow: 0 4px 15px rgba(218, 165, 32, 0.3);
}

.btn-register:hover {
    background: linear-gradient(45deg, #EEB422, #CD950C);
    box-shadow: 0 6px 20px rgba(218, 165, 32, 0.4);
}

.main-content {
    flex: 1;
    margin-top: 60px;
    padding: 20px 0;
    background: linear-gradient(180deg, #0A1128, #1C2541);
}

.logo-showcase {
    padding: 50px 0;
    position: relative;
    background: radial-gradient(circle at 50% 50%, rgba(218, 165, 32, 0.05) 0%, transparent 70%);
}

.showcase-content {
    display: flex;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.logo-side {
    flex: 1;
    text-align: center;
    max-width: 45%;
}

.logo-side img {
    width: 100%;
    max-width: 400px;
    height: auto;
    filter: drop-shadow(0 4px 20px rgba(123, 147, 255, 0.25));
    margin-bottom: 20px;
}

.logo-description {
    font-size: 28px;
    color: #DAA520;
    font-weight: bold;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    letter-spacing: 1px;
}

.content-side {
    flex: 1;
    max-width: 45%;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.platform-intro {
    width: 100%;
    padding: 25px;
    background: linear-gradient(135deg, rgba(28, 37, 65, 0.8) 0%, rgba(10, 17, 40, 0.8) 100%);
    border-radius: 20px;
    border: 1px solid rgba(218, 165, 32, 0.2);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.platform-intro p {
    color: #E6E6FA;
    font-size: 16px;
    line-height: 1.8;
    letter-spacing: 0.5px;
    text-align: left;
}

.btn-large-register {
    display: inline-block;
    padding: 30px 60px;
    background: linear-gradient(45deg, #DAA520, #B8860B);
    color: #000;
    font-size: 30px;
    font-weight: bold;
    text-decoration: none;
    border-radius: 30px;
    box-shadow: 0 5px 25px rgba(218, 165, 32, 0.4);
    transition: all 0.4s ease;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-large-register:hover {
    background: linear-gradient(45deg, #EEB422, #CD950C);
    box-shadow: 0 8px 30px rgba(218, 165, 32, 0.5);
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin: 30px auto;
    max-width: 800px;
}

.category-item {
    background: linear-gradient(135deg, rgba(28, 37, 65, 0.8) 0%, rgba(10, 17, 40, 0.8) 100%);
    border: 1px solid rgba(218, 165, 32, 0.2);
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s ease;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
}

.category-item:hover {
    transform: translateY(-5px);
    border-color: rgba(218, 165, 32, 0.3);
    box-shadow: 0 8px 30px rgba(218, 165, 32, 0.2);
    background: linear-gradient(135deg, rgba(28, 37, 65, 0.9) 0%, rgba(10, 17, 40, 0.9) 100%);
}

.category-item h3 {
    font-size: 20px;
    color: #DAA520;
    font-weight: bold;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.category-icon {
    font-size: 48px;
    color: #DAA520;
    margin-bottom: 15px;
    display: block;
    transition: all 0.4s ease;
}

.category-item:hover .category-icon {
    transform: scale(1.1);
    color: #EEB422;
}

.footer {
    background: #080E20;
    padding: 30px 0;
    border-top: 1px solid rgba(218, 165, 32, 0.1);
    margin-top: 30px;
    box-shadow: 0 -4px 30px rgba(0, 0, 0, 0.3);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.footer-section h3 {
    color: #DAA520;
    font-size: 16px;
    margin-bottom: 10px;
    position: relative;
}

.footer-section h3::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 2px;
    background: #DAA520;
}

.footer-section p {
    color: #E6E6FA;
    font-size: 12px;
    line-height: 1.6;
}

@media screen and (max-width: 768px) {
    .container {
        width: 95%;
    }

    .logo img {
        height: 70px;
    }

    .btn-login, .btn-register {
        padding: 10px 25px;
        font-size: 16px;
    }

    .showcase-content {
        flex-direction: column;
        gap: 30px;
    }

    .logo-side, .content-side {
        max-width: 100%;
    }

    .logo-side img {
        max-width: 300px;
    }

    .logo-description {
        font-size: 24px;
    }

    .platform-intro {
        padding: 15px;
    }

    .platform-intro p {
        font-size: 14px;
    }

    .btn-large-register {
        padding: 10px 40px;
        font-size: 18px;
    }

    .category-item {
        padding: 12px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .category-icon {
        font-size: 36px;
        margin-bottom: 10px;
    }
}

@media screen and (max-width: 480px) {
    .auth-buttons {
        gap: 8px;
    }

    .btn-login, .btn-register {
        padding: 8px 20px;
        font-size: 15px;
    }

    .showcase-content {
        gap: 20px;
    }

    .logo-side img {
        max-width: 250px;
    }

    .logo-description {
        font-size: 20px;
    }

    .platform-intro p {
        font-size: 14px;
    }

    .btn-large-register {
        padding: 8px 30px;
        font-size: 16px;
    }

    .category-grid {
        gap: 15px;
    }

    .category-item {
        padding: 10px;
    }

    .category-item h3 {
        font-size: 14px;
    }

    .footer {
        padding: 20px 0;
    }

    .footer-section h3 {
        font-size: 18px;
    }

    .footer-section p {
        font-size: 12px;
    }

    .logo img {
        height: 50px;
    }

    .category-icon {
        font-size: 32px;
        margin-bottom: 8px;
    }
}