/* ========== 全局 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    font-size: 16px;
    line-height: 1.8;
    color: #374151;
    background: #f0f2f5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ========== 头部 ========== */
header {
    /*background: linear-gradient(135deg, #1e3a5f 0%, #2d5f8a 100%);*/
    background: linear-gradient(90deg, #1a2980, #26d0ce);
    padding: 0.75rem 1.5rem;
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.header-right {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    gap: 0.5rem;
}
.contact-info {
    font-size: 0.88rem;
    color: rgba(255,255,255,0.65);
}
.contact-info span { margin-left: 1.5rem; }

.member-area {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    justify-content: flex-end;
}
.member-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: 2px solid rgba(255,255,255,0.3);
    object-fit: cover;
}
.member-name {
    color: rgba(255,255,255,0.75);
    font-size: 0.9rem;
}
.member-btn {
    display: inline-block;
    padding: 0.25rem 0.85rem;
    border-radius: 100px;
    font-size: 0.85rem;
    text-decoration: none;
    font-weight: 500;
    transition: all 0.2s;
}
.member-btn.register {
    color: #fff;
    border: 1px solid rgba(255,255,255,0.4);
}
.member-btn.register:hover { background: rgba(255,255,255,0.12); }
.member-btn.login {
    background: #ff5500;
    color: #fff;
    border: 1px solid #ff5500;
}
.member-btn.login:hover { background: #e04d00; }

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    letter-spacing: 1px;
}
.logo img { height: 54px; border-radius: 50%; border: 2px solid rgba(255,255,255,0.3); box-shadow: 0 2px 8px rgba(0,0,0,0.2); }
nav ul { list-style: none; display: flex; gap: 0.25rem; }
nav a {
    display: block;
    padding: 0.45rem 0.9rem;
    color: rgba(255,255,255,0.75);
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 500;
    border-radius: 8px;
    transition: all 0.2s;
}
nav a:hover, nav a.active { color: #fff; background: rgba(255,255,255,0.12); }

/* ========== 页脚 ========== */
footer {
    background: #1e293b;
    color: #cbd5e1;
    padding: 3rem 1.5rem;
}
.footer-container {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    gap: 3rem;
    flex-wrap: wrap;
}
.footer-section { flex: 1; min-width: 180px; }
.footer-section h4 { font-size: 0.95rem; font-weight: 600; color: #f1f5f9; margin-bottom: 1rem; }
.footer-section p, .footer-section a { font-size: 0.85rem; color: #94a3b8; text-decoration: none; display: block; margin-bottom: 0.35rem; }
.footer-section a:hover { color: #26d0ce; }
.footer-qr { width: 100px; border-radius: 8px; border: 1px solid #f0f2f5; }
.copyright {
    text-align: center;
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid #334155;
    font-size: 0.8rem;
    color: #64748b;
}
.copyright p { margin-bottom: 0.2rem; }