/* 重庆金铭科技 - 官网样式：蓝白灰、响应式 */

:root {
    --color-primary: #1e3a5f;
    --color-primary-light: #2563eb;
    --color-primary-dark: #0f172a;
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-400: #94a3b8;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --font-sans: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --header-height: 64px;
}

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-gray-700);
    background: var(--color-white);
}

/* ========== 顶部导航 ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    border-bottom: 1px solid var(--color-gray-200);
    backdrop-filter: blur(8px);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: 0.02em;
}

.main-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 8px;
}

.main-nav a {
    display: block;
    padding: 8px 14px;
    color: var(--color-gray-600);
    text-decoration: none;
    font-weight: 500;
    border-radius: var(--radius);
    transition: color 0.2s, background 0.2s;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-primary);
    background: var(--color-gray-50);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 8px;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--color-gray-600);
    border-radius: 1px;
}

/* ========== 首屏 Hero ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--header-height) + 48px) 24px 48px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, #1e40af 100%);
}

.hero-bg::after {
    content: '';
    position: absolute;
    inset: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 720px;
    text-align: center;
}

.hero h1 {
    margin: 0 0 20px;
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-white);
    line-height: 1.3;
    letter-spacing: 0.02em;
}

.hero-desc {
    margin: 0 0 32px;
    font-size: 1.05rem;
    color: rgba(255, 255, 255, 0.9);
    line-height: 1.7;
}

.btn {
    display: inline-block;
    padding: 12px 28px;
    font-family: var(--font-sans);
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}

.btn-primary {
    background: var(--color-white);
    color: var(--color-primary);
}

.btn-primary:hover {
    background: var(--color-gray-100);
    box-shadow: var(--shadow);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.btn-outline:hover {
    background: var(--color-primary);
    color: var(--color-white);
}

.btn-block {
    width: 100%;
}

/* ========== 内页标题区 ========== */
.page-banner {
    padding: calc(var(--header-height) + 48px) 24px 48px;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    color: var(--color-white);
    text-align: center;
}

.page-banner h1 {
    margin: 0 0 8px;
    font-size: clamp(1.5rem, 3.5vw, 2rem);
    font-weight: 700;
}

.page-banner .breadcrumb {
    margin: 0;
    font-size: 0.9rem;
    opacity: 0.9;
}

.page-banner .breadcrumb a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
}

.page-banner .breadcrumb a:hover {
    text-decoration: underline;
}

.page-content {
    padding: 48px 24px 72px;
}

.page-content .container {
    max-width: 900px;
}

.page-content .container.narrow {
    max-width: 720px;
}

/* ========== 通用区块 ========== */
.section {
    padding: 72px 24px;
}

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

.section-title {
    margin: 0 0 12px;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-primary);
    text-align: center;
}

.section-desc {
    margin: 0 auto 40px;
    text-align: center;
    color: var(--color-gray-600);
    max-width: 560px;
}

/* ========== 服务网格 ========== */
.service-grid {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}

.service-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    padding: 28px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.service-card:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    display: block;
    font-size: 2rem;
    margin-bottom: 12px;
}

.service-card h3 {
    margin: 0 0 8px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary);
}

.service-card p {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-gray-600);
    line-height: 1.5;
}

/* ========== 解决方案 / 案例入口 ========== */
.solutions-preview,
.cases-preview {
    background: var(--color-gray-50);
}

.solutions-cta,
.cases-cta {
    text-align: center;
    max-width: 520px;
    margin: 0 auto;
}

.solutions-cta p,
.cases-cta p {
    margin: 0 0 20px;
    color: var(--color-gray-600);
}

/* ========== 在线咨询表单 ========== */
.consult-section {
    background: linear-gradient(180deg, var(--color-gray-50) 0%, var(--color-white) 100%);
}

.consult-form {
    max-width: 480px;
    margin: 0 auto;
    padding: 32px;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.form-row {
    margin-bottom: 20px;
}

.form-row label {
    display: block;
    margin-bottom: 6px;
    font-weight: 500;
    color: var(--color-gray-700);
}

.form-row label span {
    color: #dc2626;
}

.form-row input,
.form-row select,
.form-row textarea {
    width: 100%;
    padding: 10px 14px;
    font-family: var(--font-sans);
    font-size: 1rem;
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius);
    color: var(--color-gray-700);
    background: var(--color-white);
    transition: border-color 0.2s;
}

.form-row input:focus,
.form-row select:focus,
.form-row textarea:focus {
    outline: none;
    border-color: var(--color-primary-light);
}

.form-row textarea {
    resize: vertical;
    min-height: 80px;
}

.consult-form .btn {
    margin-top: 8px;
}

/* ========== 页脚 ========== */
.site-footer {
    padding: 48px 24px 24px;
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.85);
}

.footer-grid {
    max-width: 1200px;
    margin: 0 auto 32px;
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 40px;
}

.footer-brand .logo {
    color: var(--color-white);
}

.footer-logo img {
    filter: brightness(0) invert(1);
    opacity: 0.95;
}

.footer-brand p {
    margin: 6px 0 0;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-links h4,
.footer-contact h4 {
    margin: 0 0 12px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-white);
}

.footer-links ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.footer-links a {
    display: block;
    padding: 4px 0;
    color: rgba(255, 255, 255, 0.75);
    text-decoration: none;
    font-size: 0.95rem;
}

.footer-links a:hover {
    color: var(--color-white);
}

.footer-contact p {
    margin: 0;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.7);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    text-align: center;
}

.footer-bottom p {
    margin: 0;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.6);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.95);
    text-decoration: none;
}

.footer-bottom a:hover {
    color: #ffffff;
    text-decoration: underline;
}

/* ========== 响应式：平板 ========== */
@media (max-width: 900px) {
    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }

    .footer-contact {
        grid-column: span 2;
    }
}

/* ========== 响应式：移动端 ========== */
@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .main-nav {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--color-white);
        border-bottom: 1px solid var(--color-gray-200);
        padding: 16px;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: transform 0.25s, opacity 0.25s, visibility 0.25s;
    }

    .main-nav.is-open {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 4px;
    }

    .main-nav a {
        padding: 12px 16px;
    }

    .section {
        padding: 48px 20px;
    }

    .service-grid {
        grid-template-columns: 1fr;
    }

    .consult-form {
        padding: 24px 20px;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer-contact {
        grid-column: 1;
    }
}