:root {
    --surface: #f9f9f9;
    --on-surface: #2d3435;
    --on-surface-variant: #5a6061;
    --outline-variant: #adb3b4;
    --surface-container: #ebeeef;
    --surface-container-lowest: #ffffff;
    --font-headline: 'Manrope', sans-serif;
    --font-body: 'Inter', sans-serif;
}

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

body {
    background-color: var(--surface);
    color: var(--on-surface);
    font-family: var(--font-body);
    line-height: 1.5;
    overflow-x: hidden;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    background: rgba(249, 249, 249, 0.7);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--surface-container);
}

.nav-container {
    max-width: 1920px;
    margin: 0 auto;
    padding: 2rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-headline);
    font-size: 1.25rem;
    letter-spacing: 0.4em;
    font-weight: 300;
    text-decoration: none;
    color: var(--on-surface);
    transition: opacity 0.3s;
}

.logo:hover {
    opacity: 0.7;
}

.nav-links {
    display: flex;
    gap: 3rem;
}

.nav-btn {
    background: none;
    border: none;
    font-family: var(--font-headline);
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 10px;
    font-weight: 500;
    color: var(--on-surface-variant);
    cursor: pointer;
    padding-bottom: 4px;
    transition: all 0.3s;
    border-bottom: 1px solid transparent;
}

.nav-btn:hover {
    color: var(--on-surface);
}

.nav-btn.active {
    color: var(--on-surface);
    border-bottom: 1px solid var(--on-surface);
}

/* Screens */
.screen {
    display: none;
    width: 100%;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* Transitions */
.push-enter {
    animation: pushEnter 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.push-exit {
    animation: pushExit 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.push-back-enter {
    animation: pushBackEnter 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.push-back-exit {
    animation: pushBackExit 0.6s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

@keyframes pushEnter {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes pushExit {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(-100%); opacity: 0; }
}

@keyframes pushBackEnter {
    from { transform: translateX(-100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

@keyframes pushBackExit {
    from { transform: translateX(0); opacity: 1; }
    to { transform: translateX(100%); opacity: 0; }
}

/* Hero */
.hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    padding: 0 3rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
    opacity: 0.4;
}

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

.hero-content {
    max-width: 1280px;
    margin: 0 auto;
    width: 100%;
    padding-top: 6rem;
}

.hero-icons {
    display: flex;
    gap: 2.5rem;
    margin-bottom: 3rem;
}

.icon {
    width: 2.5rem;
    height: 2.5rem;
}

.icon.fill {
    fill: currentColor;
}

.hero-title {
    font-family: var(--font-headline);
    font-size: clamp(2.5rem, 8vw, 6.5rem);
    font-weight: 300;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

.italic-bold {
    font-weight: 800;
    font-style: italic;
    padding-right: 1rem;
}

.hero-footer {
    position: absolute;
    bottom: 3rem;
    right: 3rem;
    text-align: right;
    font-family: var(--font-headline);
    font-size: 10px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--on-surface-variant);
}

/* Quote */
.quote-section {
    padding: 12rem 3rem;
    background: var(--surface-container-lowest);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    text-align: center;
}

.quote-text {
    font-family: var(--font-headline);
    font-size: clamp(1.5rem, 4vw, 3.5rem);
    font-weight: 300;
    line-height: 1.2;
    letter-spacing: -0.01em;
}

.italic-variant {
    font-style: italic;
    color: var(--on-surface-variant);
}

.divider {
    width: 3rem;
    height: 1px;
    background: var(--outline-variant);
    margin: 4rem auto 0;
}

/* Artifacts */
.artifacts-section {
    padding: 8rem 6rem;
}

.grid-container {
    max-width: 1440px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    align-items: center;
}

.label {
    font-family: var(--font-headline);
    font-size: 11px;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--on-surface-variant);
    margin-bottom: 1.5rem;
}

.section-title {
    font-family: var(--font-headline);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 3rem;
}

.text-content p {
    font-size: 1.125rem;
    color: var(--on-surface-variant);
    margin-bottom: 2rem;
}

.artifacts-image img {
    width: 100%;
    aspect-ratio: 3/4;
    object-fit: cover;
    filter: grayscale(1) brightness(0.9) contrast(1.1);
}

/* Trivial */
.trivial-section {
    padding: 12rem 3rem;
    background: var(--on-surface);
    color: var(--surface);
}

.trivial-title {
    font-family: var(--font-headline);
    font-size: clamp(2rem, 6vw, 5rem);
    font-weight: 800;
    line-height: 1;
    letter-spacing: -0.05em;
}

.muted {
    color: var(--outline-variant);
}

/* Systems */
.systems-section {
    padding: 12rem 3rem;
}

.grid-3 {
    max-width: 1440px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 6rem;
}

.system-card {
    padding: 2rem;
    border-left: 1px solid var(--surface-container);
}

.mt-offset {
    margin-top: 6rem;
}

.system-card h5 {
    font-family: var(--font-headline);
    font-size: 1.25rem;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

.small-text {
    font-size: 0.875rem;
    color: var(--on-surface-variant);
    line-height: 2;
}

/* Stability */
.stability-section {
    background: var(--surface-container-lowest);
}

.grid-split {
    display: grid;
    grid-template-columns: 7fr 5fr;
    min-height: 100vh;
}

.stability-image {
    position: relative;
    overflow: hidden;
}

.stability-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(1) brightness(0.9) contrast(1.1);
    transition: transform 1s;
}

.stability-image:hover img {
    transform: scale(1.05);
}

.image-label {
    position: absolute;
    bottom: 3rem;
    left: 3rem;
    color: var(--surface);
    mix-blend-mode: difference;
    font-family: var(--font-headline);
    font-size: 10px;
    letter-spacing: 0.4em;
}

.stability-content {
    padding: 6rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
}

.label-ref {
    position: absolute;
    top: 3rem;
    right: 3rem;
    font-family: var(--font-headline);
    font-size: 10px;
    letter-spacing: 0.3em;
    color: var(--outline-variant);
}

.label-bold {
    font-family: var(--font-headline);
    font-size: 11px;
    letter-spacing: 0.5em;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--on-surface-variant);
    opacity: 0.6;
    margin-bottom: 2rem;
}

.stability-title {
    font-family: var(--font-headline);
    font-size: clamp(2.5rem, 8vw, 5.5rem);
    font-weight: 300;
    line-height: 0.85;
    letter-spacing: -0.05em;
}

.italic-offset {
    font-style: italic;
    font-weight: 800;
    color: var(--on-surface-variant);
    display: inline-block;
    transform: translateX(-1rem);
}

.divider-short {
    width: 6rem;
    height: 1px;
    background: rgba(173, 179, 180, 0.4);
    margin: 3rem 0;
}

.stability-desc {
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--on-surface-variant);
    max-width: 400px;
}

.vertical-tag {
    position: absolute;
    right: 0;
    bottom: 25%;
    writing-mode: vertical-rl;
    font-family: var(--font-headline);
    font-size: 9px;
    letter-spacing: 0.8em;
    text-transform: uppercase;
    color: rgba(173, 179, 180, 0.3);
    white-space: nowrap;
}

/* Contact */
.contact-hero {
    padding: 16rem 3rem 8rem;
    min-height: 100vh;
    background: var(--surface-container-lowest);
}

.contact-title {
    font-family: var(--font-headline);
    font-size: clamp(2.5rem, 8vw, 4rem);
    font-weight: 300;
    margin-bottom: 3rem;
}

.inquiry-btn {
    background: none;
    border: 2px solid var(--on-surface);
    padding: 1.25rem 3rem;
    font-family: var(--font-headline);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    cursor: pointer;
    transition: all 0.5s;
    margin-bottom: 3rem;
}

.inquiry-btn:hover {
    background: var(--on-surface);
    color: var(--surface);
}

.contact-info {
    margin-top: 3rem;
}

.email-link {
    display: inline-block;
    font-family: var(--font-headline);
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--on-surface);
    text-decoration: none;
    border-bottom: 1px solid rgba(45, 52, 53, 0.2);
    padding-bottom: 4px;
    margin-bottom: 2rem;
    transition: border-color 0.5s;
}

.email-link:hover {
    border-color: var(--on-surface);
}

.info-desc {
    font-size: 1rem;
    color: var(--on-surface-variant);
    max-width: 350px;
}

.contact-image img {
    width: 100%;
    aspect-ratio: 4/5;
    object-fit: cover;
    filter: grayscale(1) contrast(1.1);
    box-shadow: 0 40px 80px rgba(45, 52, 53, 0.08);
}

/* Footer */
.footer {
    padding: 6rem 3rem;
    background: var(--surface-container);
    text-align: center;
}

.footer p {
    font-family: var(--font-headline);
    font-size: 10px;
    letter-spacing: 0.3em;
    text-transform: uppercase;
    color: var(--on-surface-variant);
}

/* Responsive */
@media (max-width: 768px) {
    .nav-container { padding: 1.5rem; }
    .nav-links { gap: 1.5rem; }
    .hero { padding: 0 1.5rem; }
    .grid-container { grid-template-columns: 1fr; gap: 3rem; }
    .contact-text { order: 1; }
    .contact-image { order: 2; }
    .grid-3 { grid-template-columns: 1fr; gap: 3rem; }
    .grid-split { grid-template-columns: 1fr; }
    .stability-content { padding: 3rem 1.5rem; }
    .artifacts-section { padding: 4rem 1.5rem; }
    .mt-offset { margin-top: 0; }
}