:root {
    --primary-accent: #00aaff;
    --radius-md: 12px;
    --radius-lg: 20px;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1), 0 1px 3px rgba(0, 0, 0, 0.08);
    --max-width: 1200px;
    --glass-blur: 5px;

    --text-color: #f0f8ff;
    --heading-color: #ffffff;
    --card-bg: rgba(10, 25, 41, 0.55);
    --card-border: rgba(255, 255, 255, 0.15);
    --footer-bg: rgba(0, 0, 0, 0.6);
    --copyright-border: rgba(255, 255, 255, 0.1);
}

body.light-mode {
    --text-color: #1a202c;
    --heading-color: #000000;
    --card-bg: rgba(255, 255, 255, 0.6);
    --card-border: rgba(0, 0, 0, 0.1);
    --footer-bg: rgba(245, 245, 245, 0.7);
    --copyright-border: rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    color: var(--text-color);
    line-height: 1.6;
    background-color: #000;
}

.background-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.background-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.container {
    width: 90%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg) 0;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    cursor: pointer;
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    display: flex;
    align-items: center;
    font-size: 1.1rem;
    box-shadow: var(--shadow-md);
}

.theme-toggle span {
    margin-left: 8px;
    font-weight: 500;
}

.floating-action-button {
    position: fixed;
    top: 20px;
    left: 20px;
    z-index: 1001;
    background-color: var(--primary-accent);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: bold;
    text-decoration: none;
    box-shadow: 0 4px 10px rgba(0, 170, 255, 0.4);
    transition: transform 0.2s ease;
}

.floating-action-button:hover {
    transform: scale(1.05);
}

.card {
    background-color: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--card-border);
}

@supports (backdrop-filter: blur(var(--glass-blur))) or (-webkit-backdrop-filter: blur(var(--glass-blur))) {
    .card,
    .theme-toggle,
    .floating-action-button,
    .site-footer {
        -webkit-backdrop-filter: blur(var(--glass-blur));
        backdrop-filter: blur(var(--glass-blur));
    }
}

.site-header {
    padding: var(--spacing-md) 0;
    position: absolute;
    width: 100%;
    z-index: 10;
}

.site-header .container {
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo {
    max-width: 300px;
    height: auto;
}

.hero {
    position: relative;
    padding-bottom: var(--spacing-lg);
}

.hero-content-wrapper {
    position: relative;
    width: 100%;
    max-width: 850px;
    margin: 0 auto;
}

.hero-portrait {
    position: absolute;
    left: -50px;
    width: 300px;
    height: auto;
    z-index: 1;
}

.hero .card {
    position: relative;
    z-index: 2;
    text-align: center;
    width: 100%;
    padding-left: 100px;
}

h1,
h2,
h3 {
    color: var(--heading-color);
    text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-align: center;
}

.site-footer {
    background: var(--footer-bg);
    padding: var(--spacing-lg) 0;
    text-align: center;
    transition: background-color 0.3s ease;
}

.footer-section {
    margin-bottom: var(--spacing-lg);
}

.footer-links {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-links a {
    color: var(--text-color);
    transition: color 0.2s ease;
    text-decoration: underline;
}

.footer-links a:hover {
    color: var(--primary-accent);
}

.social-links svg {
    width: 32px;
    height: 32px;
}

.copyright {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--copyright-border);
    font-size: 0.9rem;
    opacity: 0.8;
    max-width: var(--max-width);
    margin: 0 auto;
}

.copyright p,
.copyright a {
    color: var(--text-color);
}

@media (max-width: 768px) {
    .hero-portrait {
        display: none;
    }

    .hero .card {
        margin-left: 0;
        padding-left: var(--spacing-lg);
    }
}