/* Root Variables for Light/Dark Mode */
:root {
    --bg-color: #fbfbfd;
    --text-color: #1d1d1f;
    --text-muted: #86868b;
    --nav-bg: rgba(251, 251, 253, 0.8);
    --border-color: #d2d2d7;
    --accent: #0066cc;
    --accent-hover: #0071e3;
    --font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #000000;
        --text-color: #f5f5f7;
        --nav-bg: rgba(0, 0, 0, 0.75);
        --border-color: #424245;
        --accent: #2997ff;
        --accent-hover: #0071e3;
        --text-muted: #a1a1a6;
    }
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-family);
    line-height: 1.5;
    font-size: 17px;
    font-weight: 400;
    letter-spacing: -0.022em;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent-hover);
}

.container {
    max-width: 980px;
    margin: 0 auto;
    padding: 0 20px;
}

.text-center {
    text-align: center;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 44px;
    background: var(--nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid rgba(0,0,0,0.05); /* very subtle */
    z-index: 1000;
    display: flex;
    align-items: center;
}

@media (prefers-color-scheme: dark) {
    .navbar {
        border-bottom: 1px solid rgba(255,255,255,0.05);
    }
}

.logo {
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0.1em;
    opacity: 0.9;
    background: linear-gradient(90deg, #1d1d1f, #86868b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
@media (prefers-color-scheme: dark) {
    .logo {
        background: linear-gradient(90deg, #f5f5f7, #a1a1a6);
        -webkit-background-clip: text;
        -webkit-text-fill-color: transparent;
    }
}

/* Hero Section */
.hero {
    padding: 160px 0 80px;
    text-align: center;
}

.hero-title {
    font-size: 64px;
    line-height: 1.05;
    font-weight: 600;
    letter-spacing: -0.04em;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 24px;
    line-height: 1.16667;
    font-weight: 400;
    letter-spacing: 0.009em;
    color: var(--text-muted);
    max-width: 650px;
    margin: 0 auto 40px;
}

/* Sections */
.section {
    padding: 80px 0;
}

.about {
    border-top: 1px solid var(--border-color);
}

/* Grid & Content */
.grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 40px;
}

@media (min-width: 768px) {
    .grid {
        grid-template-columns: 1fr 1fr;
        gap: 60px;
    }
}

.content h3 {
    font-size: 28px;
    line-height: 1.14286;
    font-weight: 600;
    letter-spacing: 0.007em;
    margin-bottom: 15px;
}

.content p {
    color: var(--text-muted);
}

.content strong {
    color: var(--text-color);
    font-weight: 600;
}

/* Contact */
.content-contact {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: rgba(0, 0, 0, 0.02);
    border-radius: 18px;
    padding: 60px 20px;
}
@media (prefers-color-scheme: dark) {
    .content-contact {
        background-color: rgba(255, 255, 255, 0.04);
    }
}

.contact h3 {
    font-size: 40px;
    line-height: 1.1;
    font-weight: 600;
    letter-spacing: 0em;
    margin-bottom: 15px;
}

.contact p {
    font-size: 20px;
    color: var(--text-muted);
    margin-bottom: 30px;
    max-width: 400px;
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--text-color);
    color: var(--bg-color) !important;
    padding: 12px 28px;
    border-radius: 980px;
    font-size: 17px;
    font-weight: 500;
    letter-spacing: -0.022em;
    transition: transform 0.2s ease, opacity 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
    opacity: 0.85;
    transform: scale(1.02);
    box-shadow: 0 4px 14px rgba(0,0,0,0.1);
}

@media (prefers-color-scheme: dark) {
    .btn {
        background-color: var(--text-color);
        color: var(--bg-color) !important;
    }
    .btn:hover {
        box-shadow: 0 4px 14px rgba(255,255,255,0.1);
    }
}

/* Footer */
.footer {
    padding: 30px 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
    font-size: 12px;
}

.footer-content {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.legal-info {
    margin-top: 5px;
}

/* Responsive adjustments */
@media (max-width: 734px) {
    .hero {
        padding: 120px 0 60px;
    }
    .hero-title {
        font-size: 48px;
    }
    .hero-subtitle {
        font-size: 20px;
    }
    .contact h3 {
        font-size: 32px;
    }
}