:root {
    --black: #000000;
    --white: #ffffff;
    --grey-100: #f5f5f5;
    --grey-500: #737373;
    --grey-800: #262626;
    --grey-900: #111111;
    --accent: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body, html {
    background-color: var(--black);
    color: var(--white);
    font-family: 'Space Grotesk', -apple-system, BlinkMacSystemFont, sans-serif;
    width: 100%;
    height: 100%;
    overflow-x: hidden;
    overscroll-behavior-y: none;
}

.monospace {
    font-family: 'JetBrains Mono', monospace;
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

#universe-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    opacity: 0.8;
}

.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    mix-blend-mode: difference;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.2em;
}

.menu-trigger {
    background: transparent;
    border: none;
    display: flex;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    padding: 8px;
}

.menu-trigger span {
    display: block;
    width: 28px;
    height: 2px;
    background-color: var(--white);
    transition: transform 0.3s;
}

.scroll-container {
    position: relative;
    z-index: 10;
    width: 100%;
}

.screen {
    min-height: 100vh;
    min-height: 100svh; /* Modern mobile viewport */
    width: 100%;
    padding: 24px;
    display: flex;
    flex-direction: column;
    position: relative;
}

/* HERO */
.hero {
    justify-content: space-between;
    padding-top: 120px;
    padding-bottom: 40px;
}

.hero-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding-bottom: 40px;
}

.badge {
    font-size: 0.75rem;
    color: var(--grey-500);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.badge::before {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    background-color: var(--white);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--white);
    animation: pulse 2s infinite;
}

.title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.04em;
    margin-bottom: 24px;
    text-transform: uppercase;
}

.title.small {
    font-size: 2.5rem;
}

.subtitle {
    font-size: 1.125rem;
    color: var(--grey-100);
    line-height: 1.5;
    max-width: 90%;
    opacity: 0.9;
}

.hero-action {
    width: 100%;
    margin-bottom: 48px;
}

.primary-btn {
    width: 100%;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: var(--white);
    padding: 20px 24px;
    font-size: 1rem;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 700;
    letter-spacing: 0.1em;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    transition: all 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    position: relative;
    overflow: hidden;
}

.primary-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--white);
    transform: translateX(-101%);
    transition: transform 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    z-index: 0;
}

.primary-btn:active, .primary-btn:hover {
    color: var(--black);
}

.primary-btn:active::before, .primary-btn:hover::before {
    transform: translateX(0);
}

.primary-btn .btn-text, .primary-btn svg {
    position: relative;
    z-index: 1;
}

.primary-btn.inverted {
    background: var(--white);
    color: var(--black);
}
.primary-btn.inverted::before {
    background: var(--grey-800);
}
.primary-btn.inverted:active, .primary-btn.inverted:hover {
    color: var(--white);
}

.scroll-indicator {
    font-size: 0.75rem;
    color: var(--grey-500);
    text-align: center;
    position: absolute;
    bottom: 24px;
    left: 0;
    width: 100%;
    opacity: 0.7;
    animation: bounce 2s infinite;
}

/* SPECS SECTION */
.specs {
    justify-content: center;
    background: linear-gradient(to bottom, transparent, var(--grey-900), transparent);
}

.spec-grid {
    display: flex;
    flex-direction: column;
    gap: 40px;
    margin-bottom: 64px;
}

.spec-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
    border-top: 1px solid var(--grey-800);
    padding-top: 16px;
}

.spec-value {
    font-size: 2.5rem;
    font-weight: 700;
}

.spec-label {
    font-size: 0.75rem;
    color: var(--grey-500);
}

.specs-description h2 {
    font-size: 1.5rem;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.specs-description p {
    color: var(--grey-500);
    line-height: 1.6;
    font-size: 1rem;
}

/* FINAL CTA */
.final-cta {
    justify-content: center;
    align-items: center;
    text-align: center;
    gap: 40px;
}

.footer-text {
    font-size: 0.65rem;
    color: var(--grey-500);
    opacity: 0.5;
}

@keyframes pulse {
    0% { opacity: 1; box-shadow: 0 0 10px var(--white); }
    50% { opacity: 0.4; box-shadow: 0 0 2px var(--white); }
    100% { opacity: 1; box-shadow: 0 0 10px var(--white); }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

/* Desktop Overrides */
@media (min-width: 768px) {
    .title { font-size: 6rem; }
    .title.small { font-size: 4rem; }
    .hero-content { padding-bottom: 80px; }
    .primary-btn { width: 400px; padding: 24px 32px; font-size: 1.125rem; }
    .spec-grid { flex-direction: row; justify-content: space-between; }
    .spec-item { flex: 1; }
    .screen { padding: 48px; }
    .top-nav { padding: 40px 48px; }
}