/* Base Styles */
:root {
    --primary-color: #1A1A1A;
    --secondary-color: #F5F5F5;
    --accent-color: #2A5F8A;
    --accent-light: #3A7FAA;
    --text-primary: #E0E0E0;
    --text-secondary: #A0A0A0;
    --background-dark: #121212;
    --background-light: #1E1E1E;
    --transition-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-dark);
    overflow-x: hidden;
    font-size: 16px;
    letter-spacing: 0.02em;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.3s ease;
}

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

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header Styles */
.header {
    position: relative;
    height: 100vh;
    width: 100%;
    overflow: hidden;
    background-color: var(--background-dark);
}

.video-container {
    position: relative;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.video-container video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translateX(-50%) translateY(-50%);
    object-fit: cover;
}

/* 占位背景样式 */
.placeholder-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, #111, #333);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
}

@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.4);
    z-index: 1;
}

.video-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 2;
    color: white;
    font-size: 18px;
    background-color: rgba(0, 0, 0, 0.6);
    padding: 10px 20px;
    border-radius: 4px;
}

.header-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    text-align: center;
    color: var(--text-primary);
    z-index: 2;
}

.studio-name {
    font-size: 4.5rem;
    font-weight: 300;
    letter-spacing: 0.1em;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeIn 1s ease forwards;
    color: var(--text-primary);
}

.tagline {
    font-size: 1.4rem;
    font-weight: 300;
    letter-spacing: 0.2em;
    opacity: 0;
    animation: fadeIn 1s ease forwards 0.5s;
    color: var(--text-secondary);
}

/* Navigation */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 2rem;
    z-index: 1000;
    background: transparent;
    transition: all var(--transition-speed);
}

.main-nav.scrolled {
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
}

.main-nav ul {
    display: flex;
    justify-content: center;
    list-style: none;
    gap: 3rem;
}

.main-nav a {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    transition: all var(--transition-speed);
    position: relative;
    padding-bottom: 5px;
    text-transform: uppercase;
}

.main-nav a:hover {
    color: var(--accent-color);
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--accent-color);
    transition: width var(--transition-speed);
}

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

/* Portfolio Section */
.portfolio-section {
    padding: 8rem 0;
    max-width: 1400px;
    margin: 0 auto;
    background-color: var(--background-light);
}

.portfolio-header {
    text-align: center;
    margin-bottom: 4rem;
    padding: 0 2rem;
}

.section-title {
    font-size: 3rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
    position: relative;
    display: inline-block;
    color: var(--text-primary);
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background-color: var(--accent-color);
}

.section-subtitle {
    font-size: 1.2rem;
    max-width: 600px;
    margin: 0 auto;
    color: var(--text-secondary);
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 2rem;
    padding: 0 2rem;
}

.grid-item {
    position: relative;
    overflow: hidden;
    border-radius: 8px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
    background-color: var(--background-dark);
}

.grid-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
}

.grid-item.featured {
    grid-column: span 4;
    grid-row: span 1;
}

.grid-item:not(.featured) {
    grid-column: span 2;
}

/* Ensure we have clean rows with 3 items after featured item */
.portfolio-grid .grid-item:nth-child(1) {
    grid-column: span 4;
}

.portfolio-grid .grid-item:nth-child(2) {
    grid-column: span 2;
}

.portfolio-grid .grid-item:nth-child(3),
.portfolio-grid .grid-item:nth-child(4),
.portfolio-grid .grid-item:nth-child(5) {
    grid-column: span 2;
}

.portfolio-grid .grid-item:nth-child(6),
.portfolio-grid .grid-item:nth-child(7),
.portfolio-grid .grid-item:nth-child(8) {
    grid-column: span 2;
}

.project-link {
    display: block;
    color: var(--primary-color);
    text-decoration: none;
}

.project-image {
    position: relative;
    overflow: hidden;
    aspect-ratio: 16/9;
}

.grid-item.featured .project-image {
    aspect-ratio: 21/9;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.6s ease;
}

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.view-project {
    color: white;
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 10px;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.view-project i {
    transition: transform 0.2s ease;
}

.grid-item:hover .project-image img {
    transform: scale(1.05);
}

.grid-item:hover .project-overlay {
    opacity: 1;
}

.grid-item:hover .view-project {
    transform: translateY(0);
}

.grid-item:hover .view-project i {
    transform: translateX(5px);
}

.project-info {
    padding: 2rem;
    background-color: var(--background-dark);
}

.project-category {
    display: inline-block;
    font-size: 0.9rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
    letter-spacing: 0.1em;
}

.project-info h2 {
    font-size: 1.8rem;
    font-weight: 500;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.project-info p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.grid-item:hover .project-info h2 {
    color: #555;
}

.portfolio-cta {
    text-align: center;
    margin-top: 4rem;
}

.btn-primary {
    display: inline-block;
    padding: 1rem 2.5rem;
    background-color: var(--accent-color);
    color: var(--text-primary);
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
}

.btn-primary:hover {
    background-color: var(--accent-light);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(42, 95, 138, 0.3);
}

/* Media Queries for Portfolio Section */
@media (max-width: 1200px) {
    .portfolio-grid {
        grid-template-columns: repeat(4, 1fr);
    }
    
    .portfolio-grid .grid-item:nth-child(1) {
        grid-column: span 4;
    }
    
    .portfolio-grid .grid-item:nth-child(n+2) {
        grid-column: span 2;
    }
}

@media (max-width: 992px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .portfolio-grid .grid-item:nth-child(1) {
        grid-column: span 2;
    }
    
    .portfolio-grid .grid-item:nth-child(n+2) {
        grid-column: span 1;
    }
    
    .grid-item.featured .project-image {
        aspect-ratio: 16/9;
    }
}

@media (max-width: 768px) {
    .portfolio-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .portfolio-grid .grid-item:nth-child(n) {
        grid-column: span 1;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .portfolio-section {
        padding: 5rem 0;
    }
}

@media (max-width: 480px) {
    .section-title {
        font-size: 2rem;
    }
    
    .section-subtitle {
        font-size: 1rem;
    }
    
    .portfolio-header {
        margin-bottom: 3rem;
    }
    
    .project-info h2 {
        font-size: 1.3rem;
    }
}

/* About Section */
.about-section {
    padding: 8rem 0;
    background-color: var(--background-dark);
    text-align: center;
}

.about-section h2 {
    font-size: 3rem;
    font-weight: 500;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.about-section p {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.2rem;
    line-height: 1.8;
    color: var(--text-secondary);
}

/* Contact Section */
.contact-section {
    padding: 8rem 0;
    background-color: var(--background-light);
    text-align: center;
}

.contact-section h2 {
    font-size: 3rem;
    font-weight: 500;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.contact-section p {
    max-width: 600px;
    margin: 0 auto 2rem;
    font-size: 1.2rem;
    color: var(--text-secondary);
}

.contact-link {
    display: inline-block;
    font-size: 1.4rem;
    color: var(--accent-color);
    transition: all 0.3s ease;
    position: relative;
}

.contact-link:hover {
    color: var(--accent-light);
}

/* Footer */
.footer {
    padding: 3rem 0;
    background-color: var(--background-dark);
    text-align: center;
}

.copyright {
    font-size: 0.9rem;
    color: var(--text-secondary);
    letter-spacing: 0.05em;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 992px) {
    .portfolio-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .studio-name {
        font-size: 2.5rem;
    }
    
    .portfolio-grid {
        grid-template-columns: 1fr;
        padding: 4rem 1rem;
    }
    
    .main-nav ul {
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    .studio-name {
        font-size: 2.5rem;
    }
    
    .tagline {
        font-size: 1rem;
    }
    
    .main-nav {
        padding: 1.5rem 0;
    }
    
    .main-nav ul {
        gap: 1rem;
    }
}