/* 通用样式 */
*,
*::before,
*::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Helvetica Neue", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: #1f2933;
    background-color: #f7fafc;
    line-height: 1.6;
}

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

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

.container {
    width: 100%;
    max-width: 1120px;
    margin: 0 auto;
    padding: 0 16px;
}

/* 头部导航 */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(15, 23, 42, 0.06);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo a {
    font-weight: 700;
    font-size: 20px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: #2563eb;
}

.nav a {
    margin-left: 24px;
    font-size: 14px;
    color: #4b5563;
    position: relative;
}

.nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 0;
    height: 2px;
    background: #2563eb;
    transition: width 0.2s ease;
}

.nav a:hover::after {
    width: 100%;
}

/* Hero 区域 */
.hero {
    padding: 80px 0 72px;
    background: radial-gradient(circle at top left, #dbeafe 0, transparent 50%),
                radial-gradient(circle at bottom right, #e0f2fe 0, transparent 50%);
}

.hero-inner {
    display: grid;
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    gap: 40px;
    align-items: center;
}

.hero-text h1 {
    font-size: 36px;
    line-height: 1.3;
    margin-bottom: 16px;
    color: #111827;
}

.hero-text p {
    font-size: 16px;
    color: #4b5563;
    margin-bottom: 24px;
    max-width: 520px;
}

.btn-primary {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 999px;
    background: #2563eb;
    color: #ffffff;
    font-size: 14px;
    font-weight: 500;
    border: none;
    cursor: pointer;
    transition: transform 0.1s ease, box-shadow 0.1s ease, background 0.1s ease;
}

.btn-primary:hover {
    background: #1d4ed8;
    box-shadow: 0 10px 20px rgba(37, 99, 235, 0.25);
    transform: translateY(-1px);
}

.hero-visual .hero-card {
    background: #ffffff;
    border-radius: 24px;
    padding: 24px;
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.12);
}

.hero-visual h2 {
    margin: 0 0 8px;
    font-size: 20px;
}

.hero-visual p {
    margin: 0;
    color: #6b7280;
}

/* 通用区块 */
.section {
    padding: 64px 0;
}

.section-alt {
    background: #ffffff;
}

.section-title {
    font-size: 24px;
    margin-bottom: 8px;
    text-align: center;
}

.section-subtitle {
    text-align: center;
    color: #6b7280;
    max-width: 640px;
    margin: 0 auto 32px;
}

/* 服务卡片 */
.cards {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
}

.card {
    background: #ffffff;
    border-radius: 20px;
    padding: 20px;
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.06);
    border: 1px solid rgba(148, 163, 184, 0.25);
}

.card h3 {
    margin-top: 0;
    margin-bottom: 8px;
    font-size: 18px;
}

.card p {
    margin: 0 0 12px;
    color: #6b7280;
}

.card ul {
    padding-left: 18px;
    margin: 0;
    color: #4b5563;
    font-size: 14px;
}

/* 关于我们 */
.about-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: 32px;
    align-items: center;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.highlight-item {
    background: #f9fafb;
    border-radius: 16px;
    padding: 16px;
    text-align: center;
}

.highlight-number {
    display: block;
    font-size: 24px;
    font-weight: 700;
    color: #2563eb;
}

.highlight-label {
    font-size: 13px;
    color: #6b7280;
}

/* 联系我们 */
.contact-wrapper {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
    gap: 32px;
    align-items: flex-start;
}

.contact-form {
    background: #ffffff;
    border-radius: 20px;
    padding: 24px;
    box-shadow: 0 14px 30px rgba(15, 23, 42, 0.06);
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    color: #374151;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid #d1d5db;
    font-size: 14px;
    outline: none;
    transition: border 0.15s ease, box-shadow 0.15s ease;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: #2563eb;
    box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.4);
}

.contact-info {
    font-size: 14px;
    color: #4b5563;
}

/* 底部 */
.site-footer {
    padding: 24px 0;
    border-top: 1px solid rgba(148, 163, 184, 0.3);
    background: #f9fafb;
}

.footer-inner {
    text-align: center;
    font-size: 12px;
    color: #6b7280;
}

/* 提交结果页 */
.result-page {
    display: flex;
    min-height: 100vh;
    align-items: center;
    justify-content: center;
}

.result-container {
    max-width: 480px;
}

.result-card {
    background: #ffffff;
    border-radius: 20px;
    padding: 24px;
    box-shadow: 0 18px 40px rgba(15, 23, 42, 0.12);
    text-align: center;
}

.result-success h1 {
    color: #16a34a;
}

.result-error h1 {
    color: #dc2626;
}

.result-card p {
    margin-bottom: 16px;
}

/* 响应式 */
@media (max-width: 960px) {
    .hero-inner,
    .about-grid,
    .contact-wrapper {
        grid-template-columns: minmax(0, 1fr);
    }

    .cards {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 640px) {
    .header-inner {
        flex-direction: column;
        height: auto;
        padding: 10px 0;
        align-items: flex-start;
    }

    .nav {
        margin-top: 8px;
    }

    .nav a {
        margin-left: 0;
        margin-right: 16px;
    }

    .hero {
        padding-top: 56px;
    }

    .hero-inner {
        gap: 24px;
    }

    .hero-text h1 {
        font-size: 28px;
    }

    .cards {
        grid-template-columns: minmax(0, 1fr);
    }

    .about-highlights {
        grid-template-columns: minmax(0, 1fr);
    }
}