/* ===== 重置 & 基础 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: #ffffff;
    color: #1a153a;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== 按钮 ===== */
.btn {
    display: inline-block;
    font-weight: 600;
    text-align: center;
    border: 2px solid transparent;
    border-radius: 40px;
    cursor: pointer;
    transition: all 0.25s ease;
    font-family: inherit;
    line-height: 1;
}

.btn-sm {
    padding: 8px 20px;
    font-size: 14px;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

.btn-block {
    display: block;
    width: 100%;
    text-align: center;
}

.btn-primary {
    background: #5b21b6;
    color: #fff;
    border-color: #5b21b6;
}
.btn-primary:hover {
    background: #4c1d95;
    border-color: #4c1d95;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(91, 33, 182, 0.25);
}

.btn-outline {
    background: transparent;
    color: #1a153a;
    border-color: #d4cee8;
}
.btn-outline:hover {
    border-color: #5b21b6;
    color: #5b21b6;
    background: rgba(91, 33, 182, 0.04);
}

.btn-ghost {
    background: transparent;
    color: #1a153a;
    border-color: transparent;
}
.btn-ghost:hover {
    background: rgba(0,0,0,0.04);
}

.btn-white {
    background: #ffffff;
    color: #1a153a;
    border-color: #ffffff;
}
.btn-white:hover {
    background: #f5f3ff;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255,255,255,0.3);
}

.btn-outline-light {
    background: transparent;
    color: #ffffff;
    border-color: rgba(255,255,255,0.3);
}
.btn-outline-light:hover {
    background: rgba(255,255,255,0.08);
    border-color: #ffffff;
}

/* ===== 导航 ===== */
.site-header {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.04);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    font-size: 22px;
    color: #1a153a;
}
.logo-icon {
    font-size: 26px;
}
.logo-text {
    letter-spacing: -0.5px;
}
.logo-badge {
    background: #ede9fe;
    color: #5b21b6;
    font-size: 10px;
    font-weight: 700;
    padding: 2px 10px;
    border-radius: 40px;
    margin-left: 4px;
}

.main-nav {
    display: flex;
    gap: 32px;
    font-weight: 500;
    font-size: 15px;
    color: #4a4670;
}
.main-nav a {
    transition: color 0.2s;
}
.main-nav a:hover,
.main-nav a.active {
    color: #5b21b6;
}
.main-nav a.active {
    font-weight: 700;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: #1a153a;
    border-radius: 4px;
    transition: 0.2s;
}

.mobile-nav {
    display: none;
    flex-direction: column;
    padding: 16px 24px 24px;
    border-top: 1px solid rgba(0,0,0,0.04);
    background: #ffffff;
}
.mobile-nav a {
    padding: 10px 0;
    font-weight: 500;
    color: #4a4670;
    border-bottom: 1px solid #f0edf5;
}
.mobile-nav a.active {
    color: #5b21b6;
    font-weight: 700;
}
.mobile-nav .mobile-actions {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 16px;
}

/* ===== 页脚 ===== */
.site-footer {
    background: #faf9fc;
    border-top: 1px solid #f0edf5;
    padding-top: 48px;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 40px;
    padding-bottom: 32px;
}

.footer-brand .logo {
    font-size: 20px;
    margin-bottom: 12px;
}
.footer-desc {
    color: #8a86a0;
    font-size: 14px;
    max-width: 260px;
    margin-bottom: 16px;
}
.footer-social {
    display: flex;
    gap: 12px;
    font-size: 22px;
}
.footer-social a {
    opacity: 0.6;
    transition: opacity 0.2s;
}
.footer-social a:hover {
    opacity: 1;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}
.footer-col h5 {
    font-size: 14px;
    font-weight: 700;
    color: #1a153a;
    margin-bottom: 12px;
}
.footer-col a {
    display: block;
    font-size: 14px;
    color: #8a86a0;
    padding: 4px 0;
    transition: color 0.2s;
}
.footer-col a:hover {
    color: #5b21b6;
}

.footer-bottom {
    border-top: 1px solid #f0edf5;
    padding: 16px 0;
}
.footer-bottom-inner {
    display: flex;
    justify-content: space-between;
    font-size: 13px;
    color: #b8b4c8;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .main-nav {
        display: none;
    }
    .header-actions .btn-outline,
    .header-actions .btn-primary {
        display: none;
    }
    .mobile-toggle {
        display: flex;
    }
    .mobile-nav.open {
        display: flex;
    }

    .footer-inner {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    .footer-bottom-inner {
        flex-direction: column;
        text-align: center;
        gap: 6px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    .header-inner {
        height: 64px;
    }
    .logo {
        font-size: 18px;
    }
    .logo-badge {
        font-size: 9px;
        padding: 1px 8px;
    }
}