/* ===============================
   GLOBAL
   ===============================*/
body {
    margin: 0;
    padding: 0;
    background: #0A1A2F; /* 深蓝基底 */
    color: #FFFFFF;
    font-family: "Inter", "Segoe UI", Arial, sans-serif;
    line-height: 1.7;
}

h1, h2, h3 {
    margin: 0;
    padding: 0;
    font-weight: 600;
}

p {
    margin: 0;
    padding: 0;
    opacity: 0.92;
}

/* ===============================
   TOP BAR
   ===============================*/
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 18px 8%;
    background: rgba(7, 15, 30, 0.65);
    border-bottom: 1px solid rgba(255,255,255,0.08);
    backdrop-filter: blur(6px);
    position: sticky;
    top: 0;
    z-index: 999;
}

/* LOGO */
.logo img {
    height: 44px;
    object-fit: contain;
}

/* ===============================
   NAVIGATION
   ===============================*/
.nav a {
    color: #D4AF37; /* 金色 */
    margin-left: 28px;
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    transition: 0.25s;
}

.nav a:hover {
    color: #FFFFFF;
}

/* ===============================
   LANGUAGE SWITCH
   ===============================*/
.lang-switch button {
    background: #D4AF37;
    border: none;
    padding: 7px 16px;
    margin-left: 10px;
    color: #0A1A2F;
    font-weight: 700;
    border-radius: 4px;
    cursor: pointer;
    font-size: 14px;
    transition: 0.25s;
}

.lang-switch button:hover {
    background: #F2D785;
}

/* ===============================
   HERO SECTION
   ===============================*/
.hero {
    padding: 120px 8% 100px;
    background: linear-gradient(180deg, #0A1A2F 0%, #112941 100%);
}

.hero h1 {
    font-size: 50px;
    color: #D4AF37;
    margin-bottom: 20px;
}

.hero h2 {
    font-size: 28px;
    color: #FFFFFF;
    opacity: 0.95;
    margin-bottom: 20px;
}

.hero p {
    font-size: 19px;
    opacity: 0.88;
}

/* ===============================
   CONTENT SECTIONS
   ===============================*/
.section {
    padding: 70px 8%;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}

.section h3 {
    font-size: 28px;
    margin-bottom: 40px;
    color: #D4AF37;
}

/* ===============================
   BILINGUAL LAYOUT
   ===============================*/
.row {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    gap: 60px;
}

.col {
    width: 48%;
    font-size: 18px;
}

.col.en { color: #FFFFFF; }
.col.zh { color: #E8E8E8; }

/* ===============================
   FOOTER
   ===============================*/
.footer {
    background: #07101F;
    text-align: center;
    padding: 38px;
    margin-top: 60px;
    color: #B5B5B5;
    font-size: 15px;
    border-top: 1px solid rgba(255,255,255,0.05);
}

/* ===============================
   RESPONSIVE ADAPTATION
   ===============================*/
@media (max-width: 900px) {
    .col {
        width: 100%;
    }
    .nav {
        display: none; /* 手机隐藏导航（下一版可加入折叠菜单） */
    }
    .hero h1 {
        font-size: 38px;
    }
    .hero h2 {
        font-size: 22px;
    }
}

@media (max-width: 600px) {
    .lang-switch button {
        padding: 5px 12px;
        font-size: 13px;
    }
    .section {
        padding: 50px 6%;
    }
}