:root {
    --background-color: #ffffff;
    --foreground-color: #000000;
    --muted-color: #666666;
    --accent-color: #000000;
    --animation-speed: 1.5s;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #000000;
        --foreground-color: #ffffff;
        --muted-color: #999999;
        --accent-color: #ffffff;
    }
}

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

html, body {
    width: 100%;
    height: 100%;
    overflow-x: hidden;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--foreground-color);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    width: 100vw;
    min-height: 100vh;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
}

/* Structural line */
.structural-line {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 100vh;
    background: linear-gradient(to bottom, transparent, rgba(0,0,0,0.05), transparent);
    pointer-events: none;
    z-index: 1;
}

@media (prefers-color-scheme: dark) {
    .structural-line {
        background: linear-gradient(to bottom, transparent, rgba(255,255,255,0.05), transparent);
    }
}

/* Hero section */
.hero {
    position: relative;
    text-align: center;
    z-index: 10;
    max-width: 1200px;
    width: 100%;
}

.app-icon {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    object-fit: contain;
    display: block;
}

.app-name {
    font-size: clamp(3rem, 12vw, 8rem);
    font-weight: 300;
    letter-spacing: -0.05em;
    line-height: 1;
    margin-bottom: 1.5rem;
    opacity: 0;
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.4s;
}

.tagline {
    font-size: clamp(0.875rem, 2vw, 1.125rem);
    font-weight: 300;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted-color);
    margin-bottom: 4rem;
    opacity: 0;
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.6s;
}

/* Cycling feature text */
.feature-text {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: 300;
    letter-spacing: -0.02em;
    color: var(--foreground-color);
    min-height: 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity var(--animation-speed) cubic-bezier(0.165, 0.84, 0.44, 1), 
                transform var(--animation-speed) cubic-bezier(0.165, 0.84, 0.44, 1);
    opacity: 0;
    animation: fadeInUp 1s ease forwards;
    animation-delay: 0.8s;
}

.feature-text.changing {
    opacity: 0;
    transform: scale(0.95);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% {
        opacity: 0.7;
    }
    100% {
        opacity: 1;
    }
}

/* Footer */
.footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: 2rem;
    text-align: center;
    z-index: 1000;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    box-shadow: 0 -4px 24px rgba(0, 0, 0, 0.3);
}

.footer-content {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
    font-size: 0.875rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: #ffffff;
}

.footer a {
    color: #ffffff;
    text-decoration: none;
    transition: opacity 0.3s ease;
}

.footer a:hover {
    opacity: 0.6;
}

.footer-separator {
    opacity: 0.5;
}

/* Meta elements */
.meta {
    position: fixed;
    font-size: 10px;
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--muted-color);
    opacity: 0.4;
    transition: opacity 0.5s ease;
    z-index: 100;
}

.meta:hover {
    opacity: 1;
}

.meta.top-left {
    top: 2rem;
    left: 2rem;
}

.meta.top-right {
    top: 2rem;
    right: 2rem;
}

/* Legal pages */
.legal-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 4rem 2rem;
    line-height: 1.8;
}

.legal-container h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 300;
    letter-spacing: -0.02em;
    margin-bottom: 2rem;
}

.legal-container h2 {
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    font-weight: 400;
    margin-top: 3rem;
    margin-bottom: 1rem;
    letter-spacing: -0.01em;
}

.legal-container p {
    margin-bottom: 1.5rem;
    color: var(--foreground-color);
}

.legal-container ul {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
}

.legal-container li {
    margin-bottom: 0.75rem;
}

.legal-container a {
    color: var(--foreground-color);
    text-decoration: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 2px;
}

.legal-container a:hover {
    opacity: 0.7;
}

.back-link {
    position: fixed;
    top: 2rem;
    left: 2rem;
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--muted-color);
    text-decoration: none;
    opacity: 0.6;
    transition: opacity 0.3s ease;
    z-index: 100;
}

.back-link:hover {
    opacity: 1;
}

/* Mobile optimization */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .app-icon {
        width: 16px;
        height: 16px;
    }

    .meta {
        font-size: 8px;
    }

    .meta.top-left,
    .meta.top-right {
        top: 1rem;
        left: 1rem;
        right: auto;
    }

    .meta.top-right {
        left: auto;
        right: 1rem;
    }

    .footer {
        padding: 1.5rem 1rem;
    }

    .footer-content {
        gap: 1rem;
        font-size: 0.7rem;
    }

    .legal-container {
        padding: 3rem 1.5rem;
    }

    .back-link {
        top: 1rem;
        left: 1rem;
    }
}