/* ========================================
   上海张小强企业咨询事务所 - 官方网站样式
   高端奢华风格，参考 Max Mara 设计
   ======================================== */

/* CSS Variables */
:root {
    --color-primary: #1a1a1a;
    --color-secondary: #8b7355;
    --color-accent: #c9a962;
    --color-text: #333;
    --color-text-light: #666;
    --color-bg: #fff;
    --color-bg-alt: #f8f7f5;
    --color-bg-dark: #1a1a1a;
    --font-zh: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-en: 'Playfair Display', Georgia, serif;
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 20px 60px rgba(0, 0, 0, 0.08);
}

/* Reset & Base */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-zh);
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.8;
    overflow-x: hidden;
    cursor: default;
}

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

ul {
    list-style: none;
}

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

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* Cursor Progress */
.cursor-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
    width: 0%;
    z-index: 9999;
    transition: width 0.1s ease;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 60px;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 30px 0;
    transition: var(--transition);
}

.nav.scrolled {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    padding: 20px 0;
    box-shadow: 0 2px 30px rgba(0, 0, 0, 0.05);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 60px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-zh {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.3em;
    color: var(--color-primary);
}

.logo-en {
    font-size: 0.65rem;
    font-weight: 400;
    letter-spacing: 0.4em;
    color: var(--color-text-light);
    font-family: var(--font-en);
}

.nav-menu {
    display: flex;
    gap: 50px;
}

.nav-menu a {
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--color-text);
    position: relative;
    padding: 5px 0;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-secondary);
    transition: var(--transition);
}

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

.nav-cta {
    padding: 12px 30px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--color-bg);
    background: var(--color-primary);
    border: 1px solid var(--color-primary);
    transition: var(--transition);
}

.nav-cta:hover {
    background: transparent;
    color: var(--color-primary);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 30% 20%, rgba(201, 169, 98, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 80%, rgba(139, 115, 85, 0.05) 0%, transparent 50%),
        linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: 0 60px;
    max-width: 1000px;
}

.hero-subtitle {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.3em;
    color: var(--color-secondary);
    margin-bottom: 30px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s 0.2s forwards;
}

.hero-title {
    font-family: var(--font-en);
    font-size: clamp(3rem, 8vw, 6rem);
    font-weight: 400;
    line-height: 1.1;
    color: var(--color-primary);
    margin-bottom: 40px;
    letter-spacing: -0.02em;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s 0.4s forwards;
}

.hero-title .highlight {
    font-style: italic;
    color: var(--color-secondary);
}

.hero-desc {
    font-size: 1.1rem;
    font-weight: 300;
    color: var(--color-text-light);
    line-height: 2;
    margin-bottom: 50px;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s 0.6s forwards;
}

.hero-cta {
    display: flex;
    gap: 20px;
    justify-content: center;
    opacity: 0;
    transform: translateY(30px);
    animation: fadeInUp 0.8s 0.8s forwards;
}

.hero-scroll {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    opacity: 0;
    animation: fadeIn 1s 1.2s forwards;
}

.hero-scroll span {
    font-size: 0.65rem;
    font-weight: 500;
    letter-spacing: 0.3em;
    color: var(--color-text-light);
}

.scroll-line {
    width: 1px;
    height: 60px;
    background: linear-gradient(to bottom, var(--color-secondary), transparent);
    animation: scrollPulse 2s infinite;
}

@keyframes fadeInUp {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes scrollPulse {
    0%, 100% {
        opacity: 1;
        transform: scaleY(1);
    }
    50% {
        opacity: 0.5;
        transform: scaleY(0.8);
    }
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 18px 40px;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    transition: var(--transition);
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-bg);
    border: 1px solid var(--color-primary);
}

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

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border: 1px solid var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: var(--color-bg);
}

/* Section */
.section {
    padding: 150px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-label {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.3em;
    color: var(--color-secondary);
    margin-bottom: 20px;
}

.section-title {
    font-family: var(--font-en);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 400;
    color: var(--color-primary);
}

/* About Section */
.about {
    background: var(--color-bg);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text .lead {
    font-size: 1.4rem;
    font-weight: 400;
    line-height: 1.8;
    color: var(--color-primary);
    margin-bottom: 30px;
}

.about-text p {
    font-size: 1rem;
    font-weight: 300;
    color: var(--color-text-light);
    line-height: 2;
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.stat-item {
    text-align: center;
    padding: 40px 20px;
    background: var(--color-bg-alt);
    border: 1px solid rgba(0, 0, 0, 0.03);
}

.stat-number {
    display: block;
    font-family: var(--font-en);
    font-size: 3.5rem;
    font-weight: 500;
    color: var(--color-secondary);
    line-height: 1;
    margin-bottom: 15px;
}

.stat-label {
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    color: var(--color-text-light);
}

/* Advantages Section */
.advantages {
    background: var(--color-bg-alt);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.advantage-card {
    background: var(--color-bg);
    padding: 50px 40px;
    border: 1px solid rgba(0, 0, 0, 0.03);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.advantage-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-secondary), var(--color-accent));
    transform: scaleX(0);
    transform-origin: left;
    transition: var(--transition);
}

.advantage-card:hover::before {
    transform: scaleX(1);
}

.advantage-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
}

.advantage-icon {
    font-size: 2.5rem;
    margin-bottom: 25px;
}

.advantage-title {
    font-family: var(--font-en);
    font-size: 1.5rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: 25px;
    line-height: 1.3;
}

.advantage-detail p {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--color-text-light);
    line-height: 1.8;
    margin-bottom: 15px;
}

.advantage-detail .strategy {
    padding-top: 15px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
    font-weight: 500;
    color: var(--color-secondary);
}

/* Services Section */
.services {
    background: var(--color-bg);
}

.services-tabs {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-bottom: 60px;
    flex-wrap: wrap;
}

.tab-btn {
    padding: 15px 30px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-text-light);
    border: 1px solid transparent;
    transition: var(--transition);
    position: relative;
}

.tab-btn::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-secondary);
    transition: var(--transition);
    transform: translateX(-50%);
}

.tab-btn:hover,
.tab-btn.active {
    color: var(--color-primary);
}

.tab-btn.active::after {
    width: 80%;
}

.services-content {
    max-width: 800px;
    margin: 0 auto;
}

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

.service-list {
    display: grid;
    gap: 30px;
}

.service-item {
    padding: 40px;
    background: var(--color-bg-alt);
    border-left: 3px solid var(--color-secondary);
    transition: var(--transition);
}

.service-item:hover {
    border-left-color: var(--color-accent);
    transform: translateX(10px);
}

.service-item h4 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 15px;
}

.service-item p {
    font-size: 0.95rem;
    font-weight: 400;
    color: var(--color-text-light);
    line-height: 1.8;
}

.service-item.highlight {
    background: linear-gradient(135deg, var(--color-bg-alt) 0%, rgba(201, 169, 98, 0.05) 100%);
    border-left-color: var(--color-accent);
}

/* Clients Section */
.clients {
    background: var(--color-bg-alt);
}

.clients-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 50px;
}

.client-card {
    text-align: center;
    padding: 50px 40px;
    background: var(--color-bg);
    border: 1px solid rgba(0, 0, 0, 0.03);
    transition: var(--transition);
}

.client-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.client-icon {
    font-size: 3rem;
    margin-bottom: 25px;
}

.client-card h3 {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 15px;
}

.client-card p {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--color-text-light);
}

.client-tags {
    display: flex;
    justify-content: center;
    gap: 15px;
    flex-wrap: wrap;
}

.tag {
    padding: 10px 20px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-light);
    background: var(--color-bg);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.tag:hover {
    background: var(--color-primary);
    color: var(--color-bg);
    border-color: var(--color-primary);
}

/* Why Choose Us */
.why-us {
    background: var(--color-bg-dark);
    color: var(--color-bg);
}

.why-us-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.why-us .section-label {
    color: var(--color-accent);
}

.why-us .section-title {
    color: var(--color-bg);
    margin-bottom: 60px;
}

.why-list {
    display: grid;
    gap: 50px;
    text-align: left;
}

.why-list li {
    padding-left: 40px;
    position: relative;
}

.why-list li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 12px;
    height: 12px;
    background: var(--color-accent);
    border-radius: 50%;
}

.why-list strong {
    display: block;
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--color-bg);
}

.why-list p {
    font-size: 0.95rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.7);
}

/* Contact Section */
.contact {
    background: var(--color-bg);
}

.contact-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

.contact-info {
    text-align: center;
}

.contact-desc {
    font-size: 1.1rem;
    font-weight: 400;
    color: var(--color-text-light);
    margin-bottom: 50px;
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 50px;
}

.contact-card {
    padding: 40px 30px;
    background: var(--color-bg-alt);
    text-align: center;
    border: 1px solid rgba(0, 0, 0, 0.03);
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.contact-role {
    display: inline-block;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    color: var(--color-secondary);
    margin-bottom: 15px;
    padding: 5px 15px;
    background: rgba(201, 169, 98, 0.1);
}

.contact-card h4 {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.contact-phone {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 8px;
}

.contact-email {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--color-secondary);
}

.social-links {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    padding-top: 30px;
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

.social-label {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--color-text-light);
}

.social-value {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-secondary);
}

/* Footer */
.footer {
    background: var(--color-bg-dark);
    padding: 60px 0;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    text-align: center;
}

.footer-brand {
    display: flex;
    flex-direction: column;
    line-height: 1.5;
}

.footer-brand .logo-zh {
    color: var(--color-bg);
    font-size: 1.2rem;
}

.footer-brand .logo-en {
    color: rgba(255, 255, 255, 0.5);
}

.footer-copy {
    font-size: 0.8rem;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.4);
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
    .container {
        padding: 0 40px;
    }
    
    .nav-container {
        padding: 0 40px;
    }
    
    .advantages-grid {
        grid-template-columns: 1fr;
    }
    
    .clients-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-cards {
        grid-template-columns: 1fr;
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: 50px;
    }
}

@media (max-width: 768px) {
    .container {
        padding: 0 30px;
    }
    
    .nav-container {
        padding: 0 30px;
    }
    
    .nav-menu {
        display: none;
    }
    
    .hero-content {
        padding: 0 30px;
    }
    
    .hero-cta {
        flex-direction: column;
        gap: 15px;
    }
    
    .section {
        padding: 100px 0;
    }
    
    .about-stats {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .services-tabs {
        gap: 5px;
    }
    
    .tab-btn {
        padding: 12px 20px;
        font-size: 0.75rem;
    }
}

/* AOS Animation Styles */
[data-aos] {
    opacity: 0;
    transition-property: transform, opacity;
}

[data-aos="fade-up"] {
    transform: translateY(50px);
}

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