/*
 * @project: 软件服务公司官网 (Lamborghini Inspired)
 * @author: Claude
 * @date: 2026-04-10
 * @description: 基于 Lamborghini 的深色奢华设计系统
 */

/* 1. 全局变量与基础设定
----------------------------------------------------------------*/
:root {
    /* 色彩系统 (Lamborghini Dark Luxury) */
    --color-lambo-gold: #FFC000;
    --color-dark-gold: #917300;
    --color-gold-text: #FFCE3E;
    --color-absolute-black: #000000;
    --color-charcoal: #202020;
    --color-dark-iron: #181818;
    --color-pure-white: #FFFFFF;
    --color-smoke: #F5F5F5;
    --color-graphite: #494949;
    --color-ash: #7D7D7D;
    --color-steel: #969696;
    --color-slate: #666666;
    --color-cyan-pulse: #29ABE2;
    --color-link-blue: #3860BE;
    --color-teal-action: #1EAEDB;

    /* 字体系统 */
    --font-display: 'LamboType', 'Roboto', 'Helvetica Neue', 'Arial', 'Noto Sans SC', sans-serif;
    --font-body: 'LamboType', 'Open Sans', 'Noto Sans SC', sans-serif;

    /* 间距 (Lamborghini scale) */
    --spacing-xs: 2px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 40px;
    --spacing-xxl: 48px;
    --spacing-xxxl: 56px;

    /* 过渡 */
    --transition-main: all 0.3s ease-in-out;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--color-pure-white);
    background-color: var(--color-absolute-black);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1.15;
    color: var(--color-pure-white);
    text-transform: uppercase;
}

h1 {
    font-size: 80px;
    line-height: 1.13;
    letter-spacing: normal;
}

h2 {
    font-size: 54px;
    line-height: 1.19;
    letter-spacing: normal;
}

h3 {
    font-size: 27px;
    line-height: 1.37;
    letter-spacing: normal;
}

a {
    color: var(--color-pure-white);
    text-decoration: none;
    transition: var(--transition-main);
}
a:hover {
    color: var(--color-link-blue);
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.section {
    padding: var(--spacing-xxxl) 0;
}

.section-title {
    font-size: 54px;
    font-weight: 400;
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    color: var(--color-pure-white);
    text-transform: uppercase;
}
.section-subtitle {
    font-size: 18px;
    font-weight: 400;
    color: var(--color-smoke);
    text-align: center;
    max-width: 600px;
    margin: -32px auto 64px auto;
    line-height: 1.56;
}

/* 2. 头部导航栏
----------------------------------------------------------------*/
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: var(--spacing-md) 0;
    background-color: transparent;
    transition: background-color 0.3s ease;
}
.main-header.scrolled {
    background-color: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 400;
    text-transform: uppercase;
}
.logo a {
    color: var(--color-pure-white);
    text-decoration: none;
}
.logo a:hover {
    color: var(--color-lambo-gold);
}

.main-nav {
    display: none;
}
.main-nav ul {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}
.main-nav a {
    color: var(--color-pure-white);
    font-weight: 400;
    font-size: 14px;
    text-transform: uppercase;
    padding-bottom: 8px;
    border-bottom: 2px solid transparent;
    text-decoration: none;
}
.main-nav a:hover, .main-nav a.active {
    color: var(--color-lambo-gold);
    border-bottom-color: var(--color-lambo-gold);
}

.header-cta .btn {
    padding: 16px 24px;
    font-size: 16px;
}

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}
.hamburger span {
    display: block;
    width: 25px;
    height: 2px;
    background-color: var(--color-pure-white);
    transition: var(--transition-main);
}

/* 3. 首屏 Hero 区
----------------------------------------------------------------*/
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    padding: var(--spacing-lg);
    background-color: var(--color-absolute-black);
    overflow: hidden;
}
.hero-video-bg {
    position: absolute;
    top: 50%;
    left: 50%;
    width: auto;
    height: auto;
    min-width: 100%;
    min-height: 100%;
    transform: translate(-50%, -50%);
    z-index: 0;
    opacity: 0.4;
}
.hero-content {
    position: relative;
    z-index: 1;
}
.hero-content h1 {
    font-size: 80px;
    font-weight: 400;
    line-height: 1.13;
    margin-bottom: var(--spacing-md);
    letter-spacing: normal;
    color: var(--color-pure-white);
    text-transform: uppercase;
}
.hero-content h1 .highlight {
    color: var(--color-lambo-gold);
    font-weight: 400;
}
.hero-content p {
    font-size: 18px;
    font-weight: 400;
    color: var(--color-smoke);
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.56;
}

/* 4. 服务/卡片区
----------------------------------------------------------------*/
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}
.service-card {
    background: var(--color-charcoal);
    padding: var(--spacing-xl);
    border-radius: 0px;
    transition: var(--transition-main);
}
.service-card:hover {
    transform: translateY(-4px);
    background: var(--color-dark-iron);
}
.service-card .icon {
    font-size: 32px;
    color: var(--color-lambo-gold);
    margin-bottom: var(--spacing-md);
}
.service-card h3 {
    font-size: 27px;
    font-weight: 400;
    margin-bottom: var(--spacing-md);
    color: var(--color-pure-white);
    text-transform: uppercase;
}
.service-card p {
    color: var(--color-smoke);
    font-size: 16px;
    font-weight: 400;
    line-height: 1.5;
}

/* 5. 案例/作品区
----------------------------------------------------------------*/
.work-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}
.work-card {
    position: relative;
    border-radius: 0px;
    overflow: hidden;
    background-color: var(--color-charcoal);
    transition: var(--transition-main);
    text-decoration: none;
}
.work-card:hover {
    transform: translateY(-4px);
}
.work-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.work-card:hover img {
    transform: scale(1.05);
}
.work-card-content {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-lg);
    background: linear-gradient(to top, rgba(0,0,0,0.95), transparent);
}
.work-card-content h3 {
    font-size: 27px;
    font-weight: 400;
    margin-bottom: 8px;
    color: var(--color-pure-white);
    text-transform: uppercase;
}
.work-card-content p {
    color: var(--color-smoke);
    font-weight: 400;
    font-size: 14px;
}

/* 6. CTA & 页脚
----------------------------------------------------------------*/
.final-cta {
    text-align: center;
    border-bottom: none;
    background-color: var(--color-absolute-black);
}
.final-cta h2 {
    font-size: 54px;
    font-weight: 400;
    max-width: 600px;
    margin: 0 auto var(--spacing-lg) auto;
    color: var(--color-pure-white);
    text-transform: uppercase;
}

.main-footer {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-dark-iron);
    border-top: 1px solid var(--color-charcoal);
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: var(--spacing-xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--color-charcoal);
}
.footer-col h4 {
    color: var(--color-pure-white);
    margin-bottom: var(--spacing-md);
    font-weight: 400;
    font-size: 14px;
    text-transform: uppercase;
}
.footer-col p, .footer-col a {
    color: var(--color-smoke);
    font-size: 14px;
    text-decoration: none;
}
.footer-col a:hover {
    color: var(--color-lambo-gold);
}
.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.footer-bottom {
    padding-top: var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--color-ash);
    font-size: 14px;
}
.footer-bottom a {
    color: var(--color-ash);
    text-decoration: none;
}
.footer-bottom a:hover {
    color: var(--color-lambo-gold);
}

/* 7. 响应式设计
----------------------------------------------------------------*/
@media (min-width: 768px) {
    .main-nav { display: block; }
    .header-cta { display: block; }
    .hamburger { display: none; }
}

@media (max-width: 992px) {
    .hero-content h1 { font-size: 54px; }
    .section-title { font-size: 40px; }
    .work-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 767px) {
    .section { padding: var(--spacing-xxl) 0; }
    .section-title { font-size: 40px; }
    .section-subtitle { margin-bottom: var(--spacing-xl); font-size: 16px; }

    .hero-content h1 { font-size: 40px; }
    .hero-content p { font-size: 16px; }

    .main-header .container {
        justify-content: space-between;
    }
    .header-cta { display: none; }

    /* Mobile Nav Menu */
    .main-nav {
        display: block;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background-color: var(--color-absolute-black);
        transform: translateX(100%);
        transition: transform 0.3s ease-in-out;
        z-index: 999;
    }
    .main-nav.is-open {
        transform: translateX(0);
    }
    .main-nav ul {
        flex-direction: column;
        justify-content: center;
        align-items: center;
        height: 100%;
        gap: var(--spacing-xl);
    }
    .main-nav a { font-size: 24px; }

    .hamburger { z-index: 1001; }
    .hamburger.is-open span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .hamburger.is-open span:nth-child(2) { opacity: 0; }
    .hamburger.is-open span:nth-child(3) { transform: rotate(-45deg) translate(7px, -6px); }

    .footer-grid { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: var(--spacing-md); }
}

/* Re-usable button (Lamborghini style) */
.btn {
    display: inline-block;
    padding: 24px;
    border: none;
    border-radius: 0px;
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 16px;
    text-align: center;
    cursor: pointer;
    transition: var(--transition-main);
    text-decoration: none;
    text-transform: uppercase;
}
.btn-primary {
    background-color: var(--color-lambo-gold);
    color: var(--color-absolute-black);
}
.btn-primary:hover {
    background-color: var(--color-dark-gold);
    color: var(--color-absolute-black);
}
.btn-secondary {
    background-color: transparent;
    color: var(--color-pure-white);
    border: 1px solid var(--color-pure-white);
    opacity: 0.5;
}
.btn-secondary:hover {
    background-color: var(--color-teal-action);
    opacity: 0.7;
    border-color: var(--color-teal-action);
}

/* Re-usable fade-in animation */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 8. 子页面通用样式
----------------------------------------------------------------*/
.page-title-section {
    padding-top: 160px;
    padding-bottom: 80px;
    text-align: center;
    background-color: var(--color-absolute-black);
}
.page-title-section h1 {
    font-size: 80px;
    font-weight: 400;
    letter-spacing: normal;
    color: var(--color-pure-white);
    text-transform: uppercase;
}
.page-title-section p {
    font-size: 18px;
    font-weight: 400;
    color: var(--color-smoke);
    max-width: 600px;
    margin: 16px auto 0 auto;
    line-height: 1.56;
}

/* Dark Theme Contact Form */
.contact-form-section {
    padding-bottom: var(--spacing-xxxl);
    border-bottom: none;
}
.contact-form-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-xxxl);
}
.contact-info-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}
.contact-info-list strong {
    display: block;
    color: var(--color-ash);
    font-size: 14px;
    margin-bottom: 8px;
    text-transform: uppercase;
}
.contact-info-list a, .contact-info-list span {
    font-size: 18px;
    color: var(--color-pure-white);
    text-decoration: none;
}
.contact-info-list a:hover {
    color: var(--color-lambo-gold);
}

.form-group {
    margin-bottom: var(--spacing-lg);
}
.form-group label {
    display: block;
    font-weight: 400;
    margin-bottom: var(--spacing-md);
    color: var(--color-pure-white);
    text-transform: uppercase;
    font-size: 14px;
}
.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px;
    background-color: var(--color-charcoal);
    border: 1px solid var(--color-graphite);
    border-radius: 0px;
    font-family: inherit;
    font-size: 16px;
    color: var(--color-pure-white);
}
.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-lambo-gold);
}
.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

@media(max-width: 992px) {
    .contact-form-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
    }
    .page-title-section h1 {
        font-size: 54px;
    }
}

/* WeChat QR Code Popup */
.wechat-item {
    position: relative;
    width: fit-content;
}

.wechat-popup {
    position: absolute;
    right: 0;
    bottom: calc(100% + 14px);
    width: 220px;
    padding: 12px;
    background: var(--color-charcoal);
    border-radius: 0px;
    border: 1px solid var(--color-graphite);
    z-index: 20;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(8px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
}

.wechat-trigger {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 0;
    border: none;
    background: transparent;
    color: var(--color-smoke);
    font: inherit;
    cursor: pointer;
    transition: var(--transition-main);
}

.wechat-trigger::before {
    content: "";
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #2dc653;
    box-shadow: 0 0 12px rgba(45, 198, 83, 0.45);
}

.wechat-trigger:hover,
.wechat-trigger:focus-visible {
    color: var(--color-lambo-gold);
}

.wechat-trigger:focus-visible {
    outline: 2px solid var(--color-lambo-gold);
    outline-offset: 4px;
    border-radius: 0px;
}

.wechat-popup img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: 0px;
    background: var(--color-pure-white);
}

.wechat-popup p {
    margin-top: 10px;
    font-size: 13px;
    line-height: 1.5;
    color: var(--color-smoke);
    text-align: center;
}

.wechat-item:hover .wechat-popup,
.wechat-item:focus-within .wechat-popup {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translateY(0);
}

@media (max-width: 767px) {
    .wechat-popup {
        right: auto;
        left: 0;
        width: min(220px, 70vw);
    }
}

/* Re-usable fade-in animation */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}