:root {
    --primary: #2c3e50;
    --secondary: #18bc9c;
    --bg-light: #f8f9fa;
    --text-dark: #333;
    --text-light: #fff;
    --border-color: #ccc;
    --btn-blue: #006699;
    --btn-dark: #223344;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: #fff;
}
header {
    background-color: #ffffff;
    color: var(--primary);
    padding: 1rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
}
.logo img {
    height: 45px; 
    max-width: 100%;
}
nav {
    display: flex;
    gap: 20px;
    align-items: center;
    flex: 1;
    justify-content: flex-end;
}
nav a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}
nav a:hover {
    color: var(--secondary);
}
select {
    padding: 5px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
}
.btn-buy, .btn-download {
    background-color: var(--secondary);
    padding: 8px 15px;
    border-radius: 5px;
    color: white !important;
    text-decoration: none;
    display: inline-block;
}
.nav-separator {
    margin-left: 10px;
    padding-left: 20px;
    border-left: 1px solid var(--border-color);
}
.hero-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 4rem 5%;
    background-color: var(--bg-light);
    border-bottom: 1px solid #eaeaea;
    gap: 40px;
}
.hero-left {
    flex: 1;
    text-align: center;
}
.hero-left img {
    width: 120px;
    height: auto;
    margin-bottom: 15px;
}
.hero-left h1 {
    color: var(--primary);
    font-size: 2.8rem;
    margin: 0;
}
.hero-section .hero-right {
    flex: 1;
    display: flex;
    justify-content: center;
}
.video-container {
    width: 100%;
    max-width: 600px;
    background: var(--primary);
    padding: 15px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}
.video-header {
    color: white;
    font-weight: bold;
    text-align: center;
    margin-bottom: 10px;
    font-size: 1.1rem;
}
.video-container video {
    width: 100%;
    border-radius: 4px;
    display: block;
}
.section {
    padding: 4rem 5%;
    display: flex;
    align-items: center;
    gap: 40px;
}
.section.bg-light { background-color: var(--bg-light); }
.section.reverse { flex-direction: row-reverse; }
.content { flex: 1; }
.media {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}
.price { font-size: 2rem; color: var(--secondary); font-weight: bold; margin: 10px 0; }
.ui-list {
    padding-left: 20px;
}
.ui-list li {
    margin-bottom: 15px;
}
.support-container, .about-container {
    max-width: 800px;
    margin: 40px auto;
    padding: 20px;
}
.form-group { display: flex; margin-bottom: 25px; align-items: flex-start; }
.form-group label { width: 250px; font-size: 1rem; padding-top: 8px; }
.input-wrapper { flex: 1; display: flex; flex-direction: column; }
.form-control { width: 100%; max-width: 500px; padding: 10px; border: 1px solid var(--border-color); border-radius: 4px; box-sizing: border-box; }
.btn-submit { background-color: var(--btn-blue); color: white; border: none; padding: 10px 40px; border-radius: 6px; cursor: pointer; }
.btn-reset { background-color: var(--btn-dark); color: white; border: none; padding: 10px 40px; border-radius: 6px; cursor: pointer; }

/* 響應式手機版排版修正 */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        padding: 15px 5%;
        gap: 12px;
        align-items: center;
    }
    .logo {
        justify-content: center;
        width: 100%;
    }
    .logo img {
        height: 38px;
    }
    nav {
        width: 100%;
        justify-content: center;
        flex-wrap: wrap;
        gap: 10px 16px;
    }
    select {
        width: 100%;
        max-width: 180px;
        margin-bottom: 2px;
    }
    .nav-separator {
        margin-left: 0;
        padding-left: 0;
        border-left: none;
        display: inline-flex;
        gap: 16px;
    }
    .section, .section.reverse, .hero-section { 
        flex-direction: column; 
        padding: 2.5rem 5%;
        gap: 30px;
    }
    .hero-left h1 {
        font-size: 2.2rem;
    }
    .form-group {
        flex-direction: column;
        align-items: stretch;
        gap: 5px;
        margin-bottom: 20px;
    }
    .form-group label {
        width: 100%;
        padding-top: 0;
    }
    .form-control {
        max-width: 100%;
    }
    .media img {
        width: 100%;
        max-width: 100%;
    }
}