/* H&E Official Website - Premium Minimalist Design */

:root {
    --color-white: #FFFFFF;
    --color-off-white: #F8FAFC;
    --color-cream: #F0F7FF;
    --color-light-gray: #E2E8F0;
    --color-medium-gray: #94A3B8;
    --color-dark-gray: #475569;
    --color-charcoal: #334155;
    --color-black: #1E293B;
    /* Sky Blue Theme - 天蓝色主题 */
    --color-copper: #0EA5E9;
    --color-copper-light: #38BDF8;
    --color-copper-dark: #0284C7;
    --color-gold: #06B6D4;
    --font-display: 'Cormorant Garamond', 'Noto Serif SC', serif;
    --font-body: 'Source Sans 3', -apple-system, BlinkMacSystemFont, sans-serif;
    --space-xs: 0.5rem;
    --space-sm: 1.2rem;
    --space-md: 2rem;
    --space-lg: 4rem;
    --space-xl: 6rem;
    --space-xxl: 8rem;
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.08);
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
}

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

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

body {
    font-family: var(--font-body);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-charcoal);
    background: var(--color-white);
    -webkit-font-smoothing: antialiased;
}

.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-display);
    font-weight: 500;
    line-height: 1.3;
    color: var(--color-black);
}

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

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    border-bottom-color: var(--color-light-gray);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
}

.logo {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo-img {
    height: 48px;
    width: auto;
    object-fit: contain;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-black);
    letter-spacing: 0.05em;
}

.logo-subtitle {
    font-size: 0.65rem;
    font-weight: 400;
    color: var(--color-medium-gray);
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-dark-gray);
    letter-spacing: 0.02em;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-copper);
    transition: width var(--transition-normal);
}

.nav-link:hover {
    color: var(--color-black);
}

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

.nav-right {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.lang-switch {
    padding: 0.5rem 1.2rem;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    color: var(--color-dark-gray);
    background: transparent;
    border: 1px solid var(--color-light-gray);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-switch:hover {
    border-color: var(--color-copper);
    color: var(--color-copper);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
    background: none;
    border: none;
    cursor: pointer;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-black);
    transition: all var(--transition-fast);
}

/* Hamburger to X animation */
.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile menu overlay */
.nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    z-index: 998;
}

.nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

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

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-pattern {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(circle at 20% 30%, rgba(14, 165, 233, 0.05) 0%, transparent 50%), radial-gradient(circle at 80% 70%, rgba(6, 182, 212, 0.05) 0%, transparent 50%);
}

.hero-pattern::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, transparent 30%, rgba(240, 247, 255, 0.6) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    padding: var(--space-xl) var(--space-md);
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-copper);
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.1) 0%, rgba(6, 182, 212, 0.1) 100%);
    border: 1px solid rgba(14, 165, 233, 0.2);
    border-radius: 50px;
    margin-bottom: var(--space-md);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 400;
    line-height: 1.2;
    margin-bottom: var(--space-md);
}

.title-line {
    display: block;
}

.title-line.highlight {
    color: var(--color-copper);
    font-weight: 500;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-dark-gray);
    max-width: 700px;
    margin: 0 auto var(--space-lg);
    line-height: 1.8;
}

.hero-cta {
    display: flex;
    gap: 1.2rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1.2rem 2.25rem;
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-normal);
}

.btn-primary {
    color: var(--color-white);
    background: linear-gradient(135deg, var(--color-copper) 0%, var(--color-copper-dark) 100%);
    border: none;
    box-shadow: 0 4px 15px rgba(14, 165, 233, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(14, 165, 233, 0.4);
}

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

.btn-secondary:hover {
    border-color: var(--color-copper);
    color: var(--color-copper);
}

/* Scroll Indicator */
.hero-scroll {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
}

.scroll-indicator {
    width: 24px;
    height: 40px;
    border: 2px solid var(--color-light-gray);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.scroll-indicator span {
    width: 3px;
    height: 8px;
    background: var(--color-copper);
    border-radius: 2px;
    animation: scroll 1.5s ease-in-out infinite;
}

@keyframes scroll {

    0%,
    100% {
        opacity: 1;
        transform: translateY(0);
    }

    50% {
        opacity: 0.3;
        transform: translateY(6px);
    }
}

/* Sections Common */
.section {
    padding: var(--space-xxl) 0;
}

.section-header {
    margin-bottom: var(--space-xl);
}

.section-header.center {
    text-align: center;
}


.section-tag {
    display: inline-block;
    font-size: 1.2rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-copper);
    margin-bottom: 1.2rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 400;
}

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

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-xl);
    align-items: start;
}

.about-text p {
    font-size: 1.1.2rem;
    line-height: 1.9;
    color: var(--color-dark-gray);
}

.about-lead {
    font-family: var(--font-display);
    font-size: 1.5rem !important;
    font-weight: 400;
    color: var(--color-black) !important;
    margin-bottom: 1.5rem;
}

.about-stats {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding-left: var(--space-lg);
    border-left: 1px solid var(--color-light-gray);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 3rem;
    font-weight: 600;
    color: var(--color-copper);
    line-height: 1;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--color-medium-gray);
}

/* Services Section */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.service-card {
    padding: 2.5rem;
    background: var(--color-white);
    border: 1px solid var(--color-light-gray);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.service-card:hover {
    border-color: var(--color-copper-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.service-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1.5rem;
    color: var(--color-copper);
}

.service-icon svg {
    width: 100%;
    height: 100%;
}

.service-title {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 1.2rem;
}

.service-desc {
    font-size: 0.95rem;
    color: var(--color-dark-gray);
    line-height: 1.7;
}

/* Projects Section */
.projects {
    background: linear-gradient(180deg, var(--color-white) 0%, var(--color-cream) 100%);
}

.project-card {
    position: relative;
    background: var(--color-white);
    border: 1px solid var(--color-light-gray);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.project-badge {
    position: absolute;
    top: 2rem;
    left: 2rem;
    z-index: 1;
}

.project-badge span {
    display: inline-block;
    padding: 0.5rem 1.2rem;
    font-size: 0.7rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-white);
    background: var(--color-copper);
    border-radius: var(--radius-sm);
}

.project-content {
    padding: 4rem 3rem 3rem;
}

.project-info {
    margin-bottom: 3rem;
}

.project-date {
    display: inline-block;
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--color-copper);
    margin-bottom: 1.2rem;
}

.project-title {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 500;
    margin-bottom: 1.2rem;
}

.project-desc {
    font-size: 1.2rem;
    color: var(--color-dark-gray);
}

.project-features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    padding: 2rem 0;
    margin-bottom: 2rem;
    border-top: 1px solid var(--color-light-gray);
    border-bottom: 1px solid var(--color-light-gray);
}

.feature-item {
    display: flex;
    gap: 1.2rem;
    align-items: flex-start;
}

.feature-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    color: var(--color-copper);
}

.feature-icon svg {
    width: 100%;
    height: 100%;
}

.feature-text h4 {
    font-family: var(--font-body);
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.feature-text p {
    font-size: 1.2rem;
    color: var(--color-medium-gray);
    line-height: 1.5;
}

.project-cta {
    margin-top: 1.2rem;
}

/* Team Section */
.team {
    background: var(--color-white);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
}

.team-card {
    text-align: center;
    padding: 2rem;
    background: var(--color-off-white);
    border-radius: var(--radius-md);
    transition: all var(--transition-normal);
}

.team-card:hover {
    background: var(--color-white);
    box-shadow: var(--shadow-md);
}

.team-avatar {
    width: 100px;
    height: 100px;
    margin: 0 auto 1.5rem;
    border-radius: 50%;
    overflow: hidden;
    background: linear-gradient(135deg, var(--color-copper-light) 0%, var(--color-copper) 100%);
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-white);
}

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

.team-name {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.team-role {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-copper);
    margin-bottom: 1.2rem;
}

.team-bio {
    font-size: 0.9rem;
    color: var(--color-dark-gray);
    line-height: 1.6;
}

/* Partners Section */
.partners {
    padding: var(--space-lg) 0;
    background: var(--color-cream);
}

.partners-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 3rem;
}

.partner-item {
    padding: 1.2rem 2rem;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-dark-gray);
    border: 1px solid var(--color-light-gray);
    border-radius: var(--radius-sm);
    background: var(--color-white);
    transition: all var(--transition-fast);
}

.partner-item:hover {
    border-color: var(--color-copper-light);
    color: var(--color-copper);
}

.partner-with-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.partner-logo {
    height: 32px;
    width: auto;
    object-fit: contain;
}

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

.contact-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 3rem;
}

.contact-card {
    padding: 3rem;
    background: var(--color-off-white);
    border-radius: var(--radius-md);
    text-align: center;
    transition: all var(--transition-normal);
}

.contact-card:hover {
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto 1.5rem;
    color: var(--color-copper);
}

.contact-icon svg {
    width: 100%;
    height: 100%;
}

.contact-title {
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 1.2rem;
}

.contact-address {
    font-size: 0.95rem;
    color: var(--color-dark-gray);
    line-height: 1.7;
    margin-bottom: 1.2rem;
}

.contact-email {
    display: inline-block;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--color-copper);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition-fast);
}

.contact-email:hover {
    border-bottom-color: var(--color-copper);
}

/* Footer */
.footer {
    background: var(--color-black);
    color: var(--color-white);
    padding: var(--space-xl) 0 var(--space-md);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: var(--space-md);
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-white);
}

.footer-tagline {
    margin-top: 0.5rem;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.4);
}

/* Animations */
.animate-fade-in {
    opacity: 0;
    transform: translateY(20px);
    animation: fadeIn 0.8s ease forwards;
}

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

.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-lg);
    }

    .about-stats {
        flex-direction: row;
        justify-content: flex-start;
        gap: 3rem;
        padding-left: 0;
        padding-top: 2rem;
        border-left: none;
        border-top: 1px solid var(--color-light-gray);
    }

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

    .project-features {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        background: var(--color-white);
        box-shadow: var(--shadow-lg);
        transition: right var(--transition-normal);
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-content {
        padding: var(--space-lg) var(--space-sm);
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 280px;
    }

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

    .project-content {
        padding: 1.5rem;
    }

    .project-badge {
        position: relative;
        top: 0;
        left: 0;
        margin-bottom: 1.2rem;
    }

    .project-info {
        margin-bottom: 2rem;
    }

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

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

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
        align-items: center;
    }

    .footer-brand {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1.2rem;
    }
}

@media (max-width: 480px) {
    :root {
        --space-xxl: 5rem;
        --space-xl: 3.5rem;
        --space-lg: 2.5rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .about-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .partners-grid {
        flex-direction: column;
        gap: 1.2rem;
    }

    .partner-item {
        width: 100%;
        text-align: center;
    }
}