/* Import Inter font */
@import url('/fonts/inter.css');

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

:root {
    --primary-color: #0a0a0a;
    --text-color: #2c2c2c;
    --text-muted: #666666;
    --light-gray: #fafafa;
    --border-color: #e8e8e8;
    --white: #ffffff;
    --page-bg: linear-gradient(rgba(204, 232, 255, 0.3), rgba(184, 212, 255, 0.3), rgb(255, 255, 255));
    --max-width: 1200px;
}

html {
    font-size: 16px;
    line-height: 1.6;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-color);
    background: var(--page-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-weight: 400;
    transition: background 0.3s ease;
}

/* Container */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.site-header {
    padding: 20px 0;
}

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

.logo {
    display: inline-block;
}

.logo-img {
    height: 40px;
    width: auto;
    transition: none;
}

.main-nav {
    display: none;
}

.nav-list {
    list-style: none;
    display: flex;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    transition: opacity 0.3s ease;
}

.nav-link:hover {
    opacity: 0.7;
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 5px 0;
    transition: 0.3s;
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px 0;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 40px 0;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
    color: var(--primary-color);
    letter-spacing: -0.02em;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 40px;
    font-weight: 400;
}

.hero-image {
    margin-top: 60px;
}

.envelope-img {
    max-width: 280px;
    height: auto;
    opacity: 0.8;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.envelope-img:hover {
    opacity: 1;
    transform: translateY(-2px);
}

/* Footer */
.site-footer {
    padding: 30px 0;
    margin-top: auto;
}

.copyright {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 400;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Image loading transition */
img {
    transition: opacity 0.3s ease;
}

img.loaded {
    animation: fadeIn 0.5s ease-in;
}

/* Link transitions */
a {
    transition: opacity 0.2s ease, color 0.2s ease;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.125rem;
    }
    
    .envelope-img {
        max-width: 200px;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .main-content {
        padding: 40px 0;
    }
}