/* Responsive Breakpoints */
:root {
    --mobile: 480px;
    --tablet: 768px;
    --desktop: 1024px;
}

/* Base Responsive Styles */
html {
    font-size: 16px;
    overflow-x: hidden;
}

body {
    overflow-x: hidden;
    width: 100%;
    position: relative;
}

/* Mobile First Approach */
.container {
    width: 100%;
    padding: 0 1.2rem;
    margin: 0 auto;
    box-sizing: border-box;
}

/* Header and Navigation */
#header {
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

/* Navigation Container */
#main-nav .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 1.5rem;
}

/* Navigation Links */
.nav-left {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
}

/* Social Icons */
.social-icons {
    display: flex;
    gap: 1.2rem;
    align-items: center;
}

.social-icon {
    color: var(--text-primary);
    font-size: 1.2rem;
    transition: color 0.3s ease;
    padding: 0.5rem;
}

.social-icon:hover {
    color: var(--accent-color);
}

/* Main Content */
#main {
    padding-top: 80px; /* Space for fixed header */
    overflow: hidden;
}

/* Sections */
section {
    padding: 3rem 0;
    position: relative;
}

/* Tablet Styles (768px and up) */
@media screen and (min-width: 768px) {
    .container {
        max-width: 90%;
        padding: 0 2rem;
    }
    
    .key-expertise ul {
        grid-template-columns: repeat(2, 1fr);
    }
    
    #landing-page h1 {
        font-size: 3rem;
    }
    
    /* Adjust header for tablet */
    #header {
        padding: 1.5rem 0;
    }
    
    /* Adjust main content spacing */
    #main {
        padding-top: 100px;
    }
}

/* Desktop Styles (1024px and up) */
@media screen and (min-width: 1024px) {
    .container {
        max-width: 1200px;
        padding: 0 2.5rem;
    }
    
    .key-expertise ul {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* R Logo Button */
.r-logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--accent-color);
    color: white;
    border-radius: 6px;
    font-weight: 700;
    font-size: 1.2rem;
    text-decoration: none;
    margin-right: 1rem;
    transition: all 0.2s ease;
    flex-shrink: 0;
}

.r-logo:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 180, 216, 0.3);
}

/* Mobile-specific adjustments */
@media screen and (max-width: 767px) {
    /* Navigation */
    #main-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        background: rgba(10, 10, 10, 0.97);
        z-index: 1000;
        padding: 0.5rem 0;
        box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    }
    
    #main-nav .container {
        padding: 0.5rem 1.2rem;
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; /* Firefox */
        gap: 1rem;
        align-items: center;
    }
    
    /* R Logo on mobile */
    .r-logo {
        width: 36px;
        height: 36px;
        font-size: 1.1rem;
        margin-right: 0.5rem;
    }
    
    #main-nav .container::-webkit-scrollbar {
        display: none; /* Chrome, Safari, Opera */
    }
    
    .nav-left {
        flex: 1;
        min-width: max-content;
        padding-right: 1.5rem;
        gap: 1rem;
    }
    
    .nav-link {
        white-space: nowrap;
        padding: 0.5rem 0.8rem;
        border-radius: 4px;
        transition: background-color 0.2s;
    }
    
    .nav-link:hover {
        background: rgba(255, 255, 255, 0.1);
    }
    
    .social-icons {
        flex-shrink: 0;
        padding-left: 1rem;
        border-left: 1px solid rgba(255, 255, 255, 0.1);
        margin-left: 1rem;
        gap: 0.8rem;
    }
    
    .social-icon {
        font-size: 1.2rem;
        padding: 0.5rem;
        display: flex;
        align-items: center;
        justify-content: center;
        min-width: 2.5rem;
        height: 2.5rem;
        border-radius: 50%;
        background: rgba(255, 255, 255, 0.05);
        transition: all 0.2s ease;
    }
    
    .social-icon:hover {
        background: var(--accent-color);
        color: #fff;
        transform: translateY(-2px);
    }
    html {
        font-size: 15px;
        -webkit-text-size-adjust: 100%;
    }
    
    body {
        -webkit-overflow-scrolling: touch;
    }
    
    .container {
        padding: 0 1.2rem;
    }
    
    #landing-page {
        height: 100vh;
        display: flex;
        align-items: center;
        justify-content: center;
    }
    
    #landing-page h1 {
        font-size: 2.2rem;
        line-height: 1.3;
        padding: 0 1rem;
        text-align: center;
    }
    
    .professional-tagline p {
        font-size: 1.2rem;
        line-height: 1.5;
    }
    
    .key-expertise li {
        font-size: 0.95rem;
        padding: 0.8rem 1rem 0.8rem 1.8rem;
        margin-bottom: 0.5rem;
    }
    
    #header {
        padding: 0.8rem 0;
    }
    
    #main {
        padding-top: 70px;
    }
    
    section {
        padding: 2.5rem 0;
    }
    
    .item {
        margin-bottom: 2rem;
        width: 100%;
    }
    
    .key-expertise ul {
        grid-template-columns: 1fr;
        gap: 0.8rem;
    }
    
    /* Fix for mobile scrolling */
    .main-content {
        overflow-x: hidden;
        width: 100%;
    }
    
    /* Fix for fixed header spacing */
    #about {
        scroll-margin-top: 80px;
    }
}