/* ===== 米格网络 - 全局样式 ===== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #1B4D8E;
    --primary-dark: #0F3266;
    --primary-light: #2E6BBF;
    --accent: #D4A574;
    --accent-dark: #B8884D;
    --text-dark: #1A1A2E;
    --text-gray: #5A6478;
    --text-light: #8B92A5;
    --bg-white: #FFFFFF;
    --bg-light: #F7F9FC;
    --bg-gray: #EEF2F7;
    --border: #E5EAF2;
    --shadow-sm: 0 2px 8px rgba(27, 77, 142, 0.06);
    --shadow-md: 0 8px 24px rgba(27, 77, 142, 0.10);
    --shadow-lg: 0 16px 48px rgba(27, 77, 142, 0.14);
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
    font-size: 15px;
    line-height: 1.7;
    color: var(--text-dark);
    background: var(--bg-white);
    overflow-x: hidden;
}

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

a {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-light);
}

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

/* ===== 顶部导航 ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header.scrolled {
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
    color: var(--primary);
}

.logo-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-weight: 700;
    font-size: 18px;
    box-shadow: var(--shadow-sm);
}

.nav {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav a {
    color: var(--text-dark);
    font-size: 15px;
    font-weight: 500;
    padding: 8px 18px;
    border-radius: var(--radius-sm);
    position: relative;
    transition: var(--transition);
}

.nav a:hover {
    color: var(--primary);
    background: var(--bg-light);
}

.nav a.active {
    color: var(--primary);
}

.nav a.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: var(--primary);
    border-radius: 2px;
}

.header-cta {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff !important;
    padding: 10px 22px !important;
    border-radius: var(--radius-sm);
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(27, 77, 142, 0.25);
}

.header-cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(27, 77, 142, 0.35);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%);
    color: #fff !important;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    color: var(--text-dark);
    cursor: pointer;
}

/* ===== 通用按钮 ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
    color: #fff;
    box-shadow: 0 6px 20px rgba(27, 77, 142, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(27, 77, 142, 0.35);
    color: #fff;
}

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 1.5px solid var(--primary);
}

.btn-outline:hover {
    background: var(--primary);
    color: #fff;
    transform: translateY(-2px);
}

.btn-accent {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
    color: #fff;
    box-shadow: 0 6px 20px rgba(212, 165, 116, 0.30);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 28px rgba(212, 165, 116, 0.40);
    color: #fff;
}

/* ===== 通用区块 ===== */
.section {
    padding: 100px 0;
}

.section-sm {
    padding: 60px 0;
}

.section-bg {
    background: var(--bg-light);
}

.section-bg-dark {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%);
    color: #fff;
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(27, 77, 142, 0.08);
    color: var(--primary);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 16px;
    letter-spacing: 0.5px;
}

.section-bg-dark .section-tag {
    background: rgba(255, 255, 255, 0.12);
    color: #fff;
}

.section-title {
    font-size: 38px;
    font-weight: 700;
    color: var(--text-dark);
    margin-bottom: 18px;
    line-height: 1.3;
    letter-spacing: -0.5px;
}

.section-bg-dark .section-title {
    color: #fff;
}

.section-subtitle {
    font-size: 16px;
    color: var(--text-gray);
    line-height: 1.7;
}

.section-bg-dark .section-subtitle {
    color: rgba(255, 255, 255, 0.85);
}

/* ===== 页面Banner ===== */
.page-banner {
    padding: 160px 0 100px;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
    color: #fff;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(212, 165, 116, 0.15) 0%, transparent 70%);
    border-radius: 50%;
}

.page-banner::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(255, 255, 255, 0.08) 0%, transparent 70%);
    border-radius: 50%;
}

.page-banner-inner {
    position: relative;
    z-index: 2;
}

.page-banner h1 {
    font-size: 48px;
    font-weight: 700;
    margin-bottom: 20px;
    letter-spacing: -1px;
}

.page-banner p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    max-width: 720px;
    margin: 0 auto;
}

.breadcrumb {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 20px;
}

.breadcrumb a {
    color: rgba(255, 255, 255, 0.7);
}

.breadcrumb a:hover {
    color: var(--accent);
}

.breadcrumb span {
    color: var(--accent);
}

/* ===== 页脚 ===== */
.footer {
    background: #0A1E3F;
    color: rgba(255, 255, 255, 0.7);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-brand .logo {
    color: #fff;
    margin-bottom: 20px;
}

.footer-brand .logo-icon {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.8;
    margin-bottom: 20px;
}

.footer h4 {
    color: #fff;
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 22px;
}

.footer ul {
    list-style: none;
}

.footer ul li {
    margin-bottom: 12px;
}

.footer ul a {
    color: rgba(255, 255, 255, 0.65);
    font-size: 14px;
    transition: var(--transition);
}

.footer ul a:hover {
    color: var(--accent);
    padding-left: 4px;
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 14px;
}

.footer-contact-item svg {
    flex-shrink: 0;
    color: var(--accent);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    padding: 24px 0;
    text-align: center;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.5);
    margin: 0 8px;
}

.footer-bottom a:hover {
    color: var(--accent);
}

/* ===== 响应式 ===== */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: 40px;
    }

    .section-title {
        font-size: 30px;
    }

    .page-banner h1 {
        font-size: 36px;
    }

    .section {
        padding: 70px 0;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #fff;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 12px 0;
        box-shadow: var(--shadow-md);
    }

    .nav.open {
        display: flex;
    }

    .nav a {
        padding: 12px 24px;
        border-radius: 0;
    }

    .header-cta {
        display: none;
    }

    .mobile-toggle {
        display: block;
    }

    .section {
        padding: 60px 0;
    }

    .page-banner {
        padding: 130px 0 70px;
    }

    .page-banner h1 {
        font-size: 28px;
    }

    .section-title {
        font-size: 26px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .container {
        padding: 0 20px;
    }
}

/* ===== 动画 ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.animate-fadeInUp {
    animation: fadeInUp 0.8s ease-out forwards;
}

.animate-fadeIn {
    animation: fadeIn 1s ease-out forwards;
}

[data-animate] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

[data-animate].visible {
    opacity: 1;
    transform: translateY(0);
}