/* Custom Design Tokens */
:root {
    --bg-color: #fcfbfa;
    --text-color: #1a1a1a;
    --accent-color: #706f6c;
    --button-bg: #1a1a1a;
    --button-text: #fcfbfa;
    --transition-speed: 0.4s;
}

/* Dark Mode Tokens */
[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e5e5e5;
    --accent-color: #a3a3a3;
    --button-bg: #e5e5e5;
    --button-text: #121212;
}

/* Reset & Base Styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color var(--transition-speed), color var(--transition-speed);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Layout Parts */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 10%;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

#theme-toggle {
    background: none;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

#theme-toggle:hover {
    opacity: 0.7;
}

main {
    flex: 1;
    display: flex;
    align-items: center;
    padding: 0 10%;
}

.hero {
    max-width: 600px;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 400;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.hero p {
    font-size: 1.1rem;
    color: var(--accent-color);
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    background-color: var(--button-bg);
    color: var(--button-text);
    text-decoration: none;
    padding: 0.8rem 2rem;
    font-size: 0.9rem;
    border-radius: 4px;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

footer {
    padding: 2rem 10%;
    font-size: 0.8rem;
    color: var(--accent-color);
    text-align: center;
}

/* Small Screens Responsive Rule */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.2rem;
    }
}