* {
    box-sizing: border-box;
}

body {
    margin: 0;
    color: #17324d;
    font-family: "Microsoft YaHei", Arial, sans-serif;
    line-height: 1.7;
    background: #ffffff;
}

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

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

.container {
    width: min(1120px, calc(100% - 32px));
    margin: 0 auto;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: #ffffff;
    border-bottom: 1px solid #d9e8f6;
}

.header-inner {
    min-height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.logo {
    color: #0d62b8;
    font-size: 20px;
    font-weight: 700;
}

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

.nav a {
    padding: 8px 14px;
    color: #224b73;
    border-radius: 4px;
}

.nav a:hover {
    color: #ffffff;
    background: #0d62b8;
}

.banner {
    width: 100%;
    background: #eef7ff;
}

.banner img,
.banner-placeholder {
    width: 100%;
    height: clamp(260px, 38vw, 460px);
}

.banner img {
    object-fit: cover;
}

.banner-placeholder {
    display: grid;
    place-items: center;
    padding: 32px;
    color: #ffffff;
    text-align: center;
    background: linear-gradient(120deg, #0d62b8, #48a7f5);
}

.banner-placeholder h1 {
    max-width: 960px;
    margin: 0;
    font-size: clamp(28px, 4vw, 48px);
    font-weight: 700;
}

.section {
    padding: 56px 0 72px;
}

.section-title {
    margin-bottom: 28px;
    text-align: center;
}

.section-title h2,
.page h1 {
    margin: 0;
    color: #0d62b8;
    font-size: 30px;
    line-height: 1.3;
}

.product-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 22px;
}

.product-card {
    overflow: hidden;
    border: 1px solid #d9e8f6;
    border-radius: 6px;
    background: #ffffff;
    box-shadow: 0 8px 24px rgba(13, 98, 184, 0.08);
}

.product-image {
    aspect-ratio: 4 / 3;
    background: #eef7ff;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.product-card h3 {
    margin: 0;
    padding: 14px 16px 16px;
    color: #17324d;
    font-size: 17px;
    font-weight: 600;
    text-align: center;
}

.page {
    min-height: calc(100vh - 144px);
    padding: 48px 0 72px;
}

.content {
    max-width: 860px;
}

.content h1 {
    margin-bottom: 24px;
}

.content p {
    margin: 0;
    white-space: normal;
}

.contact-list {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 14px 20px;
    margin: 0;
}

.contact-list dt {
    color: #0d62b8;
    font-weight: 700;
}

.contact-list dd {
    margin: 0;
}

.empty {
    margin: 24px 0 0;
    color: #6d8399;
    text-align: center;
}

.site-footer {
    padding: 24px 0;
    color: #ffffff;
    text-align: center;
    background: #0d62b8;
}

.admin-body {
    background: #f4f9ff;
}

.admin-shell {
    display: grid;
    grid-template-columns: 220px 1fr;
    min-height: 100vh;
}

.admin-sidebar {
    padding: 28px 18px;
    color: #ffffff;
    background: #0d62b8;
}

.admin-sidebar h1 {
    margin: 0 0 28px;
    font-size: 20px;
    line-height: 1.4;
}

.admin-sidebar a {
    display: block;
    padding: 10px 12px;
    border-radius: 4px;
}

.admin-sidebar a:hover {
    background: rgba(255, 255, 255, 0.16);
}

.admin-main {
    padding: 32px;
}

.admin-panel {
    max-width: 980px;
    margin-bottom: 24px;
    padding: 24px;
    border: 1px solid #d9e8f6;
    border-radius: 6px;
    background: #ffffff;
}

.admin-panel h2 {
    margin: 0 0 18px;
    color: #0d62b8;
    font-size: 24px;
}

.form-row {
    margin-bottom: 18px;
}

.form-row label {
    display: block;
    margin-bottom: 8px;
    font-weight: 700;
}

.form-row input[type="text"],
.form-row input[type="password"],
.form-row textarea {
    width: 100%;
    padding: 10px 12px;
    color: #17324d;
    border: 1px solid #c6dbef;
    border-radius: 4px;
    font: inherit;
}

.form-row textarea {
    min-height: 140px;
    resize: vertical;
}

.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 40px;
    padding: 0 18px;
    color: #ffffff;
    border: 0;
    border-radius: 4px;
    background: #0d62b8;
    cursor: pointer;
    font: inherit;
}

.button.danger {
    background: #cf3d3d;
}

.notice {
    margin: 0 0 18px;
    padding: 10px 12px;
    color: #0b5d2d;
    border: 1px solid #b7e3c5;
    border-radius: 4px;
    background: #effaf2;
}

.preview-image {
    max-width: 320px;
    margin-top: 10px;
    border: 1px solid #d9e8f6;
    border-radius: 4px;
}

.admin-products {
    display: grid;
    gap: 14px;
}

.admin-product {
    display: grid;
    grid-template-columns: 120px 1fr auto;
    align-items: center;
    gap: 16px;
    padding: 12px;
    border: 1px solid #d9e8f6;
    border-radius: 6px;
}

.admin-product img {
    width: 120px;
    height: 90px;
    object-fit: cover;
    border-radius: 4px;
    background: #eef7ff;
}

.login-wrap {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: 24px;
}

.login-box {
    width: min(420px, 100%);
    padding: 28px;
    border: 1px solid #d9e8f6;
    border-radius: 6px;
    background: #ffffff;
}

.login-box h1 {
    margin: 0 0 22px;
    color: #0d62b8;
    font-size: 24px;
}

.error {
    margin: 0 0 16px;
    color: #cf3d3d;
}

@media (max-width: 760px) {
    .header-inner,
    .nav {
        flex-direction: column;
        align-items: stretch;
    }

    .header-inner {
        padding: 14px 0;
        gap: 12px;
    }

    .nav {
        gap: 4px;
    }

    .nav a {
        padding: 8px 0;
    }

    .admin-shell {
        grid-template-columns: 1fr;
    }

    .admin-sidebar {
        padding: 20px 16px;
    }

    .admin-main {
        padding: 20px 16px;
    }

    .admin-product {
        grid-template-columns: 88px 1fr;
    }

    .admin-product img {
        width: 88px;
        height: 66px;
    }

    .admin-product form {
        grid-column: 1 / -1;
    }

    .contact-list {
        grid-template-columns: 1fr;
        gap: 4px;
    }
}