/* 通用样式 */ body { font-family: 'Arial', sans-serif; margin: 0; padding: 0; background-color: 
    #0d0d1a;
    color: #e0e0e0; line-height: 1.6; overflow-x: hidden; /* 防止横向滚动 */
}
.container { max-width: 1200px; margin: 0 auto; padding: 20px;
}
h1, h2, h3 { color: #00e6e6; text-align: center; margin-bottom: 20px; text-shadow: 0 0 10px rgba(0, 
    230, 230, 0.5);
}
a { color: #00b3b3; text-decoration: none; transition: color 0.3s ease;
}
a:hover { color: #00ffff;
}
.btn { display: inline-block; background-color: #00b3b3; color: #fff; padding: 10px 20px; 
    border-radius: 5px; text-transform: uppercase; font-weight: bold; transition: background-color 
    0.3s ease, transform 0.2s ease; border: none; cursor: pointer;
}
.btn:hover { background-color: #00ffff; transform: translateY(-2px);
}
.btn-small { padding: 8px 15px; font-size: 0.9em;
}
.section { padding: 60px 0; text-align: center; position: relative;
}
.section.dark-bg { background-color: #1a1a2e;
}
/* Header */ header { background-color: rgba(13, 13, 26, 0.8); padding: 15px 0; position: fixed; 
    width: 100%; top: 0; z-index: 1000; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.5); backdrop-filter: 
    blur(5px);
}
header .container { display: flex; justify-content: space-between; align-items: center;
}
header h1 { margin: 0; font-size: 2.5em; color: #fff; text-shadow: 0 0 15px #00ffff;
}
header nav ul { list-style: none; margin: 0; padding: 0; display: flex;
}
header nav ul li { margin-left: 30px;
}
header nav ul li a { color: #e0e0e0; font-weight: bold; padding: 5px 0; position: relative;
}
header nav ul li a::after { content: ''; position: absolute; width: 0; height: 2px; background-color: 
    #00ffff;
    left: 50%; bottom: -5px; transition: all 0.3s ease; transform: translateX(-50%);
}
header nav ul li a:hover::after { width: 100%;
}
/* Hero Section */ .hero-section { height: 100vh; display: flex; justify-content: center; align-items: 
    center; background: 
    url('https://via.placeholder.com/1920x1080/000000/FFFFFF?text=Space+Journey+Background') no-repeat 
    center center/cover; /* 替换为你的宇宙背景图 */ position: relative; text-align: center; color: 
    #fff;
    overflow: hidden;
}
.hero-section::before { content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%; 
    background: rgba(0, 0, 0, 0.6); z-index: 1;
}
.hero-content { position: relative; z-index: 2; padding: 20px;
}
.hero-content h2 { font-size: 4em; margin-bottom: 20px; color: #fff; text-shadow: 0 0 20px #00ffff, 0 
    0 30px #00ffff;
}
.hero-content p { font-size: 1.5em; margin-bottom: 40px; max-width: 800px; margin-left: auto; 
    margin-right: auto;
}
/* About Section */
#about p {
    max-width: 800px; margin: 20px auto; font-size: 1.1em;
}
/* Technology Section */ .tech-grid { display: grid; grid-template-columns: repeat(auto-fit, 
    minmax(280px, 1fr)); gap: 30px; margin-top: 40px;
}
.tech-item { background-color: #2a2a4a; padding: 30px; border-radius: 10px; box-shadow: 0 0 20px 
    rgba(0, 255, 255, 0.2); transition: transform 0.3s ease, box-shadow 0.3s ease; text-align: left;
}
.tech-item:hover { transform: translateY(-10px); box-shadow: 0 0 30px rgba(0, 255, 255, 0.5);
}
.tech-item h3 { color: #00ffff; margin-top: 0; font-size: 1.8em; text-align: left;
}
.tech-item p { font-size: 1em; color: #cccccc;
}
/* Aliens Section */ .alien-gallery { display: grid; grid-template-columns: repeat(auto-fit, 
    minmax(280px, 1fr)); gap: 30px; margin-top: 40px;
}
.alien-card { background-color: #1e1e3b; padding: 30px; border-radius: 10px; box-shadow: 0 0 15px 
    rgba(0, 230, 230, 0.3); transition: transform 0.3s ease, background-color 0.3s ease; text-align: 
    left;
}
.alien-card:hover { transform: scale(1.03); background-color: #252545;
}
.alien-card h3 { color: #00e6e6; margin-top: 0; font-size: 1.8em; text-align: left;
}
.alien-card p { font-size: 1em; color: #cccccc;
}
/* Journey Section */ .journey-options { display: grid; grid-template-columns: repeat(auto-fit, 
    minmax(300px, 1fr)); gap: 30px; margin-top: 40px;
}
.option-card { background-color: #2a2a4a; padding: 30px; border-radius: 10px; box-shadow: 0 0 20px 
    rgba(0, 255, 255, 0.2); text-align: center; transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.option-card:hover { transform: translateY(-10px); box-shadow: 0 0 30px rgba(0, 255, 255, 0.5);
}
.option-card h3 { color: #00ffff; margin-top: 0; font-size: 2em;
}
.option-card p { font-size: 1.1em; color: #cccccc; margin-bottom: 25px;
}
/* Contact Section */ .contact-form { max-width: 600px; margin: 40px auto 0; display: flex; 
    flex-direction: column; gap: 20px; padding: 30px; background-color: #1e1e3b; border-radius: 10px; 
    box-shadow: 0 0 20px rgba(0, 230, 230, 0.2);
}
.contact-form input[type="text"], .contact-form input[type="email"], .contact-form textarea { width: 
    100%; padding: 15px; border: 1px solid #00b3b3; border-radius: 5px; background-color: #0d0d1a; 
    color: #e0e0e0; font-size: 1em; box-sizing: border-box; /* Ensures padding doesn't increase width 
    */
}
.contact-form input::placeholder, .contact-form textarea::placeholder { color: #888;
}
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-color: #00ffff; 
    box-shadow: 0 0 8px rgba(0, 255, 255, 0.5);
}
.contact-form button.btn { align-self: flex-end; margin-top: 10px;
}
/* Footer */ footer { background-color: #0d0d1a; color: #888; text-align: center; padding: 30px 0; 
    border-top: 1px solid #1a1a2e;
}
/* 响应式设计 */ @media (max-width: 768px) { header .container { flex-direction: column;
    }
    header h1 { margin-bottom: 15px;
    }
    header nav ul { flex-direction: column; align-items: center;
    }
    header nav ul li { margin: 10px 0;
    }
    .hero-content h2 { font-size: 3em;
    }
    .hero-content p { font-size: 1.2em;
    }
    .tech-grid, .alien-gallery, .journey-options { grid-template-columns: 1fr;
    }
}
@media (max-width: 480px) { .hero-content h2 { font-size: 2.5em;
    }
    .hero-content p { font-size: 1em;
    }
    h1 { font-size: 2em;
    }
    h2 { font-size: 1.8em;
    }
}