/* Root Variables */
:root {
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --text-primary: #0A0A0A;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    --border-color: #E5E7EB;
    --accent-color: #1F2937;
    --accent-gold: #D4A574;
    --card-shadow: 0 1px 3px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.02);
    --card-shadow-hover: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --bg-primary: #000000;
    --bg-secondary: #0A0A0A;
    --text-primary: #F9FAFB;
    --text-secondary: #9CA3AF;
    --text-tertiary: #6B7280;
    --border-color: #1F2937;
    --accent-color: #F9FAFB;
    --card-shadow: 0 1px 3px rgba(255, 255, 255, 0.03), 0 1px 2px rgba(255, 255, 255, 0.02);
    --card-shadow-hover: 0 20px 25px -5px rgba(255, 255, 255, 0.08), 0 10px 10px -5px rgba(255, 255, 255, 0.04);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    transition: var(--transition);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Navigation */
.nav {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.85);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
}

[data-theme="dark"] .nav {
    background-color: rgba(0, 0, 0, 0.85);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.25rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
}

.logo-img {
    height: 50px;
    width: auto;
}

.logo-light {
    display: block;
}

.logo-dark {
    display: none;
}

[data-theme="dark"] .logo-light {
    display: none;
}

[data-theme="dark"] .logo-dark {
    display: block;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

@media (min-width: 769px) {
    .nav-actions {
        gap: 1rem;
    }
}

.lang-toggle {
    background: transparent;
    border: none;
    border-radius: 6px;
    padding: 0.5rem 0.75rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.lang-toggle:hover {
    background: var(--bg-secondary);
}

.lang-text {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    transition: color 0.2s ease;
}

.lang-toggle:hover .lang-text {
    color: var(--text-primary);
}

.theme-toggle {
    background: transparent;
    border: none;
    border-radius: 6px;
    width: 36px;
    height: 36px;
    padding: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.sun-icon { display: block; }
.moon-icon { display: none; }

[data-theme="dark"] .sun-icon { display: none; }
[data-theme="dark"] .moon-icon { display: block; }

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 3rem;
}

/* Hero Section */
.hero {
    padding: 16rem 0 12rem;
    text-align: center;
    background: var(--bg-primary);
    margin-top: 88px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent-gold), transparent);
    opacity: 0.3;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.hero-illustration {
    width: 100%;
    height: 100%;
    opacity: 0.6;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 300;
    letter-spacing: -2px;
    margin-bottom: 1.5rem;
    line-height: 1.1;
    color: var(--text-primary);
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-tertiary);
    margin-bottom: 1rem;
    font-weight: 400;
    letter-spacing: 3px;
    text-transform: uppercase;
    font-size: 0.875rem;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 2rem auto 0;
    line-height: 1.8;
    font-weight: 300;
}

/* Sections */
.section {
    padding: 8rem 0;
}

.section-title {
    font-size: 3rem;
    font-weight: 300;
    text-align: center;
    margin-bottom: 5rem;
    letter-spacing: -1px;
    position: relative;
    display: inline-block;
    width: 100%;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -1rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 1px;
    background: var(--accent-gold);
}

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

.about-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 2;
    font-weight: 300;
}

/* Investment Focus */
.focus-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 3rem;
    margin-top: 4rem;
}

.focus-card {
    background-color: transparent;
    border: none;
    border-left: 1px solid var(--border-color);
    padding: 0 0 0 2.5rem;
    text-align: left;
    transition: var(--transition);
    position: relative;
}

.focus-card:hover {
    border-left-color: var(--accent-gold);
    transform: translateX(8px);
}

.focus-card:hover .focus-number {
    color: var(--accent-gold);
}

.focus-card:hover .focus-icon {
    transform: scale(1.05);
    opacity: 1;
}

.focus-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
    opacity: 0.8;
    transition: var(--transition);
}

.focus-number {
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-tertiary);
    margin-bottom: 1.5rem;
    letter-spacing: 2px;
}

.focus-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    font-weight: 500;
    letter-spacing: -0.5px;
}

.focus-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.95rem;
    font-weight: 300;
}

/* Portfolio */
.portfolio {
    background-color: var(--bg-secondary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
    margin-top: 4rem;
}

.portfolio-logo {
    margin-bottom: 3rem;
    height: 80px;
    display: flex;
    align-items: center;
}

.brand-logo {
    height: 100%;
    width: auto;
    max-width: 300px;
}

.brand-logo-light {
    display: block;
}

.brand-logo-dark {
    display: none;
}

[data-theme="dark"] .brand-logo-light {
    display: none;
}

[data-theme="dark"] .brand-logo-dark {
    display: block;
}

.portfolio-tag {
    font-size: 0.7rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 1.5rem;
    font-weight: 400;
}

.portfolio-title {
    font-size: 1.5rem;
    font-weight: 500;
    margin-bottom: 1.25rem;
    letter-spacing: -0.5px;
    color: var(--text-primary);
}

.portfolio-card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    padding: 3rem 2.5rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.portfolio-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-gold), transparent);
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.portfolio-card:hover {
    box-shadow: var(--card-shadow-hover);
    transform: translateY(-4px);
}


.portfolio-description {
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.9;
    font-size: 0.95rem;
    font-weight: 300;
}

.portfolio-highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.highlight-badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--text-secondary);
    font-weight: 400;
    letter-spacing: 0.5px;
    transition: var(--transition);
}

.portfolio-card:hover .highlight-badge {
    border-color: var(--accent-gold);
    color: var(--accent-gold);
}

.portfolio-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 400;
    font-size: 0.875rem;
    display: inline-flex;
    align-items: center;
    letter-spacing: 1px;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.portfolio-link:hover {
    color: var(--accent-gold);
    border-bottom-color: var(--accent-gold);
}

/* Philosophy */
.philosophy-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 4rem;
    margin-top: 4rem;
}

.philosophy-item {
    text-align: left;
    padding: 2rem 0;
    border-top: 1px solid var(--border-color);
    transition: var(--transition);
}

.philosophy-item:hover {
    border-top-color: var(--accent-gold);
}

.philosophy-item:hover .philosophy-icon {
    transform: translateY(-4px);
    opacity: 1;
}

.philosophy-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 1.5rem;
    opacity: 0.8;
    transition: var(--transition);
}

.philosophy-item h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    font-weight: 500;
    letter-spacing: -0.5px;
}

.philosophy-item p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.95rem;
    font-weight: 300;
}

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

.contact-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.contact-content p {
    font-size: 1rem;
    color: var(--text-tertiary);
    margin-bottom: 0.5rem;
    letter-spacing: 1px;
    font-weight: 300;
}

.contact-email {
    font-size: 1.75rem !important;
    color: var(--text-primary) !important;
    font-weight: 300;
    margin: 2.5rem 0 !important;
    letter-spacing: -0.5px;
}

.contact-address-block {
    margin-top: 2rem;
}

.contact-address-label {
    font-size: 0.85rem !important;
    color: var(--text-tertiary) !important;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    margin-bottom: 0.75rem !important;
    font-weight: 400;
}

.contact-address {
    font-size: 1rem !important;
    color: var(--text-secondary) !important;
    line-height: 1.8 !important;
    font-weight: 300;
}

/* Disclaimer */
.disclaimer {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-color);
}

.disclaimer-content {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
    margin-top: 4rem;
}

.disclaimer-box {
    padding: 2rem;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 2px;
    border-left: 3px solid var(--accent-gold);
}

.disclaimer-box h3 {
    font-size: 1.125rem;
    font-weight: 500;
    margin-bottom: 1rem;
    letter-spacing: -0.3px;
    color: var(--text-primary);
}

.disclaimer-box p {
    color: var(--text-secondary);
    line-height: 1.8;
    font-size: 0.875rem;
    font-weight: 300;
}

/* Footer */
.footer {
    background-color: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 3rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 3rem;
}

.footer-main {
    flex: 1;
    max-width: 800px;
}

.footer-main p {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    letter-spacing: 0.5px;
    font-weight: 300;
    margin-bottom: 0.75rem;
}

.copyright {
    font-size: 0.85rem !important;
    color: var(--text-primary) !important;
    font-weight: 400 !important;
    margin-bottom: 1rem !important;
}

.company-info {
    font-size: 0.8rem !important;
    margin-bottom: 1.5rem !important;
}

.footer-disclaimer {
    line-height: 1.6 !important;
    max-width: 700px;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-links a {
    color: var(--text-tertiary);
    text-decoration: none;
    font-size: 0.8rem;
    transition: var(--transition);
    letter-spacing: 0.5px;
    font-weight: 300;
}

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

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        padding: 0 2rem;
    }

    .nav-container {
        padding: 1.5rem 2rem;
    }

    .hero-title {
        font-size: 3.5rem;
    }

    .focus-grid,
    .portfolio-grid,
    .philosophy-content,
    .disclaimer-content {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .focus-card {
        border-left: none;
        border-top: 1px solid var(--border-color);
        padding: 2rem 0 0 0;
    }

    .focus-card:hover {
        transform: translateY(-4px);
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 8rem 0 5rem;
    }

    .hero-title {
        font-size: 2rem;
        letter-spacing: -0.5px;
        line-height: 1.2;
    }

    .hero-subtitle {
        font-size: 0.7rem;
        letter-spacing: 2px;
    }

    .hero-description {
        font-size: 0.95rem;
        line-height: 1.6;
    }

    .section {
        padding: 4rem 0;
    }

    .section-title {
        font-size: 1.75rem;
        margin-bottom: 2.5rem;
    }

    .about-content p {
        font-size: 1rem;
        line-height: 1.8;
    }

    .focus-icon {
        width: 48px;
        height: 48px;
    }

    .focus-card h3 {
        font-size: 1.25rem;
    }

    .focus-card p {
        font-size: 0.9rem;
    }

    .portfolio-logo {
        height: 60px;
        margin-bottom: 2rem;
    }

    .portfolio-title {
        font-size: 1.25rem;
    }

    .portfolio-description {
        font-size: 0.9rem;
    }

    .portfolio-highlights {
        gap: 0.5rem;
    }

    .highlight-badge {
        font-size: 0.7rem;
        padding: 0.35rem 0.75rem;
    }

    .philosophy-icon {
        width: 40px;
        height: 40px;
    }

    .philosophy-item h3 {
        font-size: 1.125rem;
    }

    .philosophy-item p {
        font-size: 0.9rem;
    }

    .contact-email {
        font-size: 1.35rem !important;
    }

    .disclaimer-box {
        padding: 1.5rem;
    }

    .disclaimer-box h3 {
        font-size: 1rem;
    }

    .disclaimer-box p {
        font-size: 0.825rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
    }

    .footer-main {
        max-width: 100%;
    }

    .footer-main p {
        font-size: 0.75rem;
    }

    .container {
        padding: 0 1.5rem;
    }

    .nav-container {
        padding: 1rem 1.5rem;
    }

    .logo-img {
        height: 32px;
    }

    .lang-toggle,
    .theme-toggle {
        width: 32px;
        height: 32px;
    }

    .lang-text {
        font-size: 0.8rem;
    }

    .theme-toggle svg,
    .lang-toggle svg {
        width: 16px;
        height: 16px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 6rem 0 4rem;
    }

    .hero-title {
        font-size: 1.5rem;
        letter-spacing: -0.3px;
    }

    .hero-subtitle {
        font-size: 0.65rem;
    }

    .hero-description {
        font-size: 0.875rem;
    }

    .section {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 1.5rem;
        margin-bottom: 2rem;
    }

    .container {
        padding: 0 1.25rem;
    }

    .nav-container {
        padding: 0.875rem 1.25rem;
    }

    .logo-img {
        height: 28px;
    }

    .portfolio-card {
        padding: 2rem 1.5rem;
    }

    .contact-email {
        font-size: 1.125rem !important;
    }
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Touch optimization for mobile */
@media (hover: none) and (pointer: coarse) {
    .portfolio-card:hover,
    .focus-card:hover,
    .philosophy-item:hover {
        transform: none;
    }

    .portfolio-card:active {
        transform: scale(0.98);
    }

    .lang-toggle:active,
    .theme-toggle:active {
        transform: scale(0.95);
    }
}

/* Prevent text size adjustment on mobile */
body {
    -webkit-text-size-adjust: 100%;
    -moz-text-size-adjust: 100%;
    -ms-text-size-adjust: 100%;
}

/* 确保导航按钮在所有尺寸下横向排列 */
.nav-actions {
    display: flex !important;
    flex-direction: row !important;
    align-items: center !important;
    gap: 0.5rem !important;
}