:root {
    /* Light Mode (Default) */
    --bg-color: #fcfcfb; /* Stone 50 approx */
    --text-color: #1a1a1a;
    --text-secondary: #a8a29e; /* Stone 400 */
    --accent-color: #1a1a1a;
    --button-bg: #1a1a1a;
    --button-text: #ffffff;
    --font-heading: system-ui, -apple-system, sans-serif;
    --font-body: system-ui, -apple-system, sans-serif;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1f1f1f; /* Dark Gray */
        --text-color: #f3f3f3;
        --text-secondary: #999999;
        --accent-color: #f3f3f3;
        --button-bg: #f3f3f3;
        --button-text: #000000;
    }
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.hero {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 2rem;
    position: relative;
    overflow: hidden;
}

.content {
    z-index: 2;
    max-width: 600px;
    animation: fadeIn 1s ease-out;
}

.logo {
    font-size: 4rem;
    font-weight: 200; /* Thin, elegant weight */
    letter-spacing: -0.05em;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--text-color) 0%, var(--text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    font-weight: 300;
}

.app-store-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--button-bg);
    color: var(--button-text);
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 2rem;
    font-weight: 500;
    transition: transform 0.2s ease, opacity 0.2s ease;
}

.app-store-button:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

.visual {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 1;
    pointer-events: none;
    opacity: 0.5;
}

.circle {
    width: 60vw;
    height: 60vw;
    max-width: 500px;
    max-height: 500px;
    border-radius: 50%;
    background: radial-gradient(circle, var(--text-secondary) 0%, transparent 70%);
    opacity: 0.1;
    filter: blur(40px);
    animation: breathe 8s infinite alternate ease-in-out;
}

footer {
    padding: 2rem;
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

footer a {
    color: inherit;
    text-decoration: none;
    margin: 0 0.5rem;
    transition: color 0.2s;
}

footer a:hover {
    color: var(--text-color);
}

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

@keyframes breathe {
    from { transform: scale(1); opacity: 0.1; }
    to { transform: scale(1.1); opacity: 0.15; }
}

@media (min-width: 768px) {
    .logo {
        font-size: 6rem;
    }
    
    .tagline {
        font-size: 1.5rem;
    }
}