:root {
    --bg: #ffffff;
    --fg: #000000;
    --fg-muted: #666666;
    --border: #e5e5e5;
    --font-serif: 'Playfair Display', serif;
    --font-sans: 'Inter', sans-serif;
    --container-max: 1440px;
    --header-height: 80px;
    --touch-target: 48px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg);
    color: var(--fg);
    font-family: var(--font-sans);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, .serif {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.1;
}

/* Layout */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 100px 0;
}

/* Header */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border);
}

header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    text-decoration: none;
    color: var(--fg);
}

nav {
    display: flex;
    gap: 2rem;
}

nav a {
    text-decoration: none;
    color: var(--fg);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    transition: opacity 0.2s;
    display: flex;
    align-items: center;
    min-height: var(--touch-target);
}

nav a:hover {
    opacity: 0.5;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

/* Language Selector */
.lang-selector {
    position: relative;
}

.lang-toggle {
    background: none;
    border: none;
    font-family: var(--font-sans);
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0 0.5rem;
    color: var(--fg);
    min-height: var(--touch-target);
}

.lang-menu {
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--bg);
    border: 1px solid var(--border);
    padding: 0.25rem;
    display: flex;
    flex-direction: column;
    min-width: 80px;
    box-shadow: 0 4px 12px rgba(0,0,0,0.05);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all 0.2s ease;
    z-index: 1001;
}

.lang-selector.active .lang-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-btn {
    background: none;
    border: none;
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.75rem;
    text-align: center;
    color: var(--fg);
    opacity: 0.4;
    transition: all 0.2s;
    min-height: var(--touch-target);
    width: 100%;
}

.lang-btn:hover, .lang-btn.active {
    opacity: 1;
    background: #f5f5f5;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    background: var(--fg);
    color: var(--bg);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: background 0.2s;
    min-height: var(--touch-target);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
}

.btn:hover {
    background: #333;
}

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

/* Hero */
.hero {
    padding-top: calc(var(--header-height) + 60px);
    min-height: 90vh;
    display: flex;
    align-items: center;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: clamp(2.5rem, 5vw, 5rem);
    margin-bottom: 2rem;
}

.hero-content .subtitle {
    font-size: 1.25rem;
    color: var(--fg-muted);
    margin-bottom: 2rem;
}

.hero-actions {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
    flex-wrap: wrap;
}

.hero-visuals {
    position: relative;
    width: 100%;
}

.hero-main-placeholder {
    width: 100%;
    aspect-ratio: 4/5;
    background: #f5f5f5;
}

.hero-main-img {
    width: 100%;
    height: 100%;
    display: block;
    object-fit: cover;
}

.hero-support-imgs {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    width: 100%;
}

.hero-support-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

/* Problem Section */
.problem {
    background: var(--fg);
    color: var(--bg);
}

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

.problem-card {
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    padding-top: 1.5rem;
}

/* Services */
.service-block {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 4rem;
    margin-bottom: 8rem;
    align-items: center;
}

.service-visuals {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.service-img, .case-img {
    width: 100%;
    height: auto;
    display: block;
    object-fit: cover;
}

/* Demo Cases */
.case {
    margin-bottom: 120px;
}

.case-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.case-strip {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

/* Video */
.case-video-container {
    width: 100%;
    aspect-ratio: 16/9;
    background: #000;
    overflow: hidden;
}

.case-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

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

.result-item {
    padding: 2rem;
    border: 1px solid var(--border);
}

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

.collab-card {
    padding: 3rem 2rem;
    border: 1px solid var(--fg);
    text-align: center;
}

/* Footer */
footer {
    padding: 80px 0;
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 4rem;
}

.footer-info a {
    display: block;
    text-decoration: none;
    color: var(--fg);
    margin-bottom: 0.5rem;
}

/* Animations */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s cubic-bezier(0.2, 0.8, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.8, 0.2, 1);
    will-change: opacity, transform;
}

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

.placeholder {
    display: block;
    width: 100%;
    position: relative;
    background-color: #f5f5f5;
    overflow: hidden;
}

.placeholder img {
    opacity: 0;
    transition: opacity 0.5s ease;
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.placeholder img.loaded {
    opacity: 1;
}

picture {
    display: block;
    width: 100%;
    height: 100%;
}

/* Responsive */
@media (max-width: 1024px) {
    .hero-grid, .service-block {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .problem-grid, .result-grid, .collab-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 767px) {
    .container {
        padding: 0 20px;
    }

    section {
        padding: 60px 0;
    }

    .problem-grid, .service-visuals, .case-grid, .case-strip, .result-grid, .collab-grid, .footer-grid {
        grid-template-columns: 1fr;
    }

    .service-visuals, .case-grid, .case-strip {
        margin-left: -20px;
        margin-right: -20px;
        width: calc(100% + 40px);
    }
    
    .service-visuals .placeholder, 
    .case-grid .placeholder, 
    .case-strip .placeholder {
        border-radius: 0;
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .menu-toggle {
        display: block;
        min-height: var(--touch-target);
        min-width: var(--touch-target);
    }

    nav {
        display: none;
    }

    .header-actions .btn {
        display: none;
    }

    .lang-toggle {
        font-size: 1rem;
    }
}