:root {
    --bg-color: #fcfcfc;
    --text-main: #111111;
    --text-muted: #666666;
    --accent: #000000;
    --surface: #ffffff;
    --border: rgba(0, 0, 0, 0.08);
    --shadow: 0 30px 60px rgba(0, 0, 0, 0.08);
}

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

html {
    scroll-behavior: smooth;
    background-color: var(--bg-color);
}

body {
    font-family: 'Inter', -apple-system, sans-serif;
    color: var(--text-main);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* 3D Background */
#webgl-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    pointer-events: none;
    opacity: 0.8; /* Subtle integration */
}

/* Navigation */
.premium-nav {
    position: fixed;
    top: 0; width: 100%;
    height: 80px;
    background: rgba(252, 252, 252, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    z-index: 1000;
}

.nav-content {
    max-width: 1400px;
    margin: 0 auto;
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
}

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-main);
    text-decoration: none;
    letter-spacing: -0.05em;
}

.nav-links {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    opacity: 0.6;
    transition: opacity 0.3s;
}

.nav-links a:hover {
    opacity: 1;
}

/* Buttons */
.luxury-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 100px;
    text-decoration: none;
    color: var(--text-main);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    backdrop-filter: blur(10px);
    cursor: pointer;
}

.luxury-btn:hover {
    border-color: var(--text-main);
    transform: translateY(-2px);
}

.luxury-btn.primary {
    background: var(--text-main);
    color: #ffffff;
    border-color: var(--text-main);
}

.luxury-btn.primary:hover {
    box-shadow: 0 15px 30px rgba(0,0,0,0.15);
    transform: translateY(-4px);
}

.luxury-btn.massive {
    padding: 24px 48px;
    font-size: 1.25rem;
}

.whatsapp-btn {
    background: #25D366; /* Official WhatsApp color */
    border-color: #25D366;
    color: white;
    gap: 12px;
}

.whatsapp-btn:hover {
    background: #1EBE5D;
    border-color: #1EBE5D;
    box-shadow: 0 15px 30px rgba(37, 211, 102, 0.3);
}

.wa-icon {
    width: 28px;
    height: 28px;
}

/* Personal Hero Layout - Centered with balanced avatar */
.hero.personal-hero {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding: 0 40px;
}

.hero-container {
    max-width: 800px;
    width: 100%;
    z-index: 2;
    text-align: center;
}

.intro-header {
    display: inline-flex;
    align-items: center;
    gap: 24px;
    margin-bottom: 24px;
    flex-wrap: wrap;
    justify-content: center;
}

.hero-avatar {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--border);
    box-shadow: var(--shadow);
    animation: floatAvatar 6s ease-in-out infinite alternate;
}

@keyframes floatAvatar {
    0% { transform: translateY(0); }
    100% { transform: translateY(-10px); }
}

.hero-text h1 {
    font-size: clamp(3.5rem, 8vw, 5.5rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.1;
    color: var(--text-main);
    margin: 0;
}

.hero-text .subtitle {
    font-size: clamp(1.2rem, 2vw, 1.5rem);
    color: var(--text-muted);
    margin-bottom: 40px;
    font-weight: 400;
    line-height: 1.6;
    margin-left: auto;
    margin-right: auto;
}

.hero-text .social-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    justify-content: center;
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    opacity: 0.5;
}

.scroll-indicator span {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 600;
}

.scroll-indicator .line {
    width: 1px;
    height: 40px;
    background: var(--text-main);
}

/* Sticky Stacking Section */
.stacking-section {
    padding: 160px 40px;
    max-width: 1400px;
    margin: 0 auto;
}

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

.stacking-section .section-header h2 {
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 12px;
}

.stacking-section .section-header p {
    font-size: 1.25rem;
    color: var(--text-muted);
}

.stacking-container {
    display: flex;
    flex-direction: column;
    gap: 40px;
    position: relative;
    padding-bottom: 80px;
}

.stacking-card {
    position: sticky;
    top: 120px; /* Offset from top of viewport when stuck */
    padding-top: calc(var(--index) * 20px); /* Slight vertical offset for stacked look */
}

.card-1 { --index: 1; z-index: 1; }
.card-2 { --index: 2; z-index: 2; }
.card-3 { --index: 3; z-index: 3; }

.card-content {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border: 1px solid var(--border);
    border-radius: 32px;
    padding: 40px;
    box-shadow: 0 -20px 60px rgba(0,0,0,0.05), 0 30px 60px rgba(0,0,0,0.08);
    display: flex;
    flex-direction: column;
    gap: 32px;
    transform-origin: top center;
    transition: transform 0.5s ease;
}

.slide-visual {
    width: 100%;
    border-radius: 20px;
    overflow: hidden;
    background: #f0f0f0;
}

.slide-visual img {
    width: 100%;
    height: 500px;
    object-fit: cover;
    object-position: top center;
    display: block;
    transition: transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.card-content:hover .slide-visual img {
    transform: scale(1.03);
}

.slide-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.title-wrap {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 16px;
    width: 100%;
    border-bottom: 1px solid var(--border);
    padding-bottom: 16px;
}

.project-num {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-muted);
}

.slide-text h3 {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    letter-spacing: -0.03em;
}

.slide-text p {
    color: var(--text-muted);
    font-size: 1.25rem;
    line-height: 1.6;
    margin-bottom: 32px;
    max-width: 800px;
}

.project-link {
    display: inline-flex;
    align-items: center;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-main);
    text-decoration: none;
    padding-bottom: 4px;
    border-bottom: 2px solid var(--text-main);
    transition: opacity 0.3s;
}

.project-link:hover {
    opacity: 0.5;
}

/* Expertise Grid */
.expertise-section {
    padding: 160px 40px;
    background: #f5f5f7; /* Very light gray to distinguish section */
    position: relative;
    z-index: 10; /* Ensures it scrolls OVER the sticky cards */
}

.expertise-container {
    max-width: 1400px;
    margin: 0 auto;
}

.expertise-container .section-header h2 {
    font-size: clamp(3rem, 5vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: 80px;
}

.expertise-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.expertise-card {
    background: var(--surface);
    border-radius: 32px;
    padding: 64px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.04);
}

.badge {
    display: inline-block;
    padding: 8px 16px;
    background: #111;
    color: #fff;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 40px;
}

.expertise-card h3 {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 16px;
    line-height: 1.2;
}

.expertise-card .institution {
    font-size: 1.3rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 32px;
}

.expertise-card .desc {
    font-size: 1.15rem;
    color: var(--text-muted);
    line-height: 1.6;
}

.list-card ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.list-card li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    border-radius: 12px;
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.list-card li:hover {
    background: rgba(0,0,0,0.02);
    border-color: var(--border);
    transform: translateX(10px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.02);
}

.list-card li:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.list-card li strong {
    font-size: 1.25rem;
    font-weight: 600;
}

.list-card li span {
    font-size: 1rem;
    color: var(--text-muted);
}

/* Contact */
.contact-section {
    padding: 200px 40px;
    text-align: center;
    position: relative;
    overflow: hidden;
    z-index: 10;
    background: var(--surface);
}

.contact-section::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80vw;
    height: 80vw;
    background: radial-gradient(circle, rgba(0, 0, 0, 0.04) 0%, rgba(255,255,255,0) 70%);
    z-index: -1;
    animation: pulseGlow 4s infinite alternate;
}

@keyframes pulseGlow {
    0% { transform: translate(-50%, -50%) scale(0.8); opacity: 0.5; }
    100% { transform: translate(-50%, -50%) scale(1.2); opacity: 1; }
}

.contact-content {
    position: relative;
    z-index: 2;
}

.mind-boggling-text {
    font-size: clamp(3rem, 6vw, 6rem);
    font-weight: 800;
    letter-spacing: -0.05em;
    margin-bottom: 64px;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.1;
    background: linear-gradient(270deg, #111111, #888888, #111111, #000000);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: gradientFlow 6s ease infinite;
    text-shadow: 0 10px 30px rgba(0,0,0,0.05);
}

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

.contact-actions {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 24px;
}

.contact-actions .luxury-btn {
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.contact-actions .luxury-btn:hover {
    transform: scale(1.05) translateY(-5px);
    box-shadow: 0 20px 40px rgba(0,0,0,0.2);
}

.email-btn {
    background: #ffffff;
    border-color: #111111;
    color: #111111;
    gap: 12px;
}

.email-btn:hover {
    background: #111111;
    color: #ffffff;
}

/* Footer */
.footer {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
    font-weight: 500;
    position: relative;
    z-index: 10;
    background: var(--surface);
}

/* Responsive */
@media (max-width: 1000px) {
    .expertise-grid {
        grid-template-columns: 1fr;
    }
    
    .slide-visual img {
        height: auto;
        max-height: 350px;
        object-fit: contain;
    }
    
    .card-content {
        padding: 24px;
    }
}

@media (max-width: 600px) {
    .nav-links { display: none; }
    .expertise-card { padding: 40px 24px; }
    .list-card li {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
    .intro-header {
        flex-direction: column;
        gap: 16px;
    }
}