/* =========================
   GENERAL RESET
========================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    line-height: 1.6;
    color: var(--text-color);
    background: var(--bg-color);
}

/* =========================
   THEME VARIABLES
========================= */
:root {
    --bg-color: #fff;
    --text-color: #333;
    --header-bg: #237bdbf5;
    --section-bg: #fff;
    --card-bg: #f9f9f9;
    --card-text: #222;
    --accent-color: #237bdbf5;
    --overlay-dark: rgba(0, 0, 0, 0.5);
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #f1f1f1;
    --header-bg: #1f1f1f;
    --section-bg: #1e1e1e;
    --card-bg: #2a2a2a;
    --card-text: #f1f1f1;
    --accent-color: #4dabf7;
    --overlay-dark: rgba(0, 0, 0, 0.7);
}

/* Smooth transitions */
body, header, section, footer, .subsection, .blog-post, a, #theme-toggle {
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* =========================
   HEADER & NAVIGATION
========================= */
header {
    background: var(--header-bg);
    color: var(--text-color);
    padding: 10px 10px;
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
}

nav {
    display: flex;
    justify-content: center;
}

    nav a {
        color: var(--text-color);
        text-decoration: none;
        margin: 0 15px;
        font-weight: bold;
        transition: color 0.3s;
    }

        nav a:hover {
            color: lightpink;
        }

/* Theme Toggle Button */
#theme-toggle {
    margin-left: 20px;
    padding: 6px 12px;
    border: none;
    border-radius: 8px;
    background: #fff;
    color: #333;
    font-size: 1rem;
    cursor: pointer;
}

body.dark-mode #theme-toggle {
    background: #333;
    color: #fff;
}

/* =========================
   SECTIONS
========================= */
section {
    background: var(--section-bg);
    padding: 100px 20px;
    min-height: 100vh;
}

/* Home Section */
#home {
    position: relative;
    background: url('images/chill.jpg') no-repeat center/cover;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    text-align: left;
    color: #fff; /* Always light text for visibility */
}

body.dark-mode #home {
    color: #f1f1f1;
}

#home::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--overlay-dark);
}

/* Home Text Animation */
#home h1,
#home p {
    position: relative;
    text-align: left;
    margin: 0 0 20px 0;
    z-index: 1;
    opacity: 0;
    animation: fadeIn 2s ease forwards;
    animation-delay: 1.5s;
}

#home h1 {
    font-size: 3rem;
    margin-bottom: 10px;
    animation-delay: 0.5s;
}

/* Social icons in Home */
.social-icons-home {
    position: absolute;
    bottom: 30px;
    right: 30px;
    z-index: 10;
    display: flex;
    flex-direction: row;
    gap: 15px;
}

    .social-icons-home img {
        width: 40px;
        height: auto;
        transition: transform 0.3s ease;
    }

    .social-icons-home a:hover img {
        transform: scale(1.1);
    }

/* =========================
   OTHER SECTIONS
========================= */
h2 {
    position: sticky;
    top: 50px;
    background-color: var(--section-bg);
    z-index: 10;
    padding-top: 10px;
    padding-bottom: 10px;
    margin-bottom: 10px;
    font-size: 2rem;
    color: var(--card-text);
    text-align: center;
}

p {
    max-width: 700px;
    margin: 0 auto 20px auto;
    text-align: center;
    color: var(--text-color);
}

/* About Section */
.about-container {
    background-color: var(--section-bg);
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.subsection {
    background: var(--card-bg);
    color: var(--card-text);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

    .subsection h3 {
        text-align: center;
        color: var(--accent-color);
        margin-bottom: 15px;
        font-size: 1.5rem;
    }

/* Projects Section */
.projects-container {
    background-color: var(--section-bg);
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

/* Blog Section */
.blog-container {
    background-color: var(--section-bg);
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.blog-post {
    background: var(--card-bg);
    color: var(--card-text);
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    /**border: 1px solid #444;
    margin: 0 auto;*/
}

    .blog-post h3 {
        text-align: center;
        color: var(--card-text);
        margin-bottom: 10px;
    }

    .blog-post .post-date {
        text-align: center;
        color: #777;
        font-style: italic;
        margin-bottom: 20px;
    }

    .blog-post a {
        display: block;
        text-align: center;
        margin-top: 15px;
        color: var(--accent-color);
        text-decoration: none;
        font-weight: bold;
    }

        .blog-post a:hover {
            text-decoration: underline;
        }

/* Contact Section */
#contact {
    background: var(--section-bg);
    color: var(--text-color);
}

/* =========================
   FOOTER
========================= */
footer {
    background: var(--header-bg);
    color: var(--text-color);
    text-align: center;
    padding: 30px;
}

/* =========================
   BACK TO TOP BUTTON
========================= */
#backToTop {
    display: flex; 
    position: fixed;
    bottom: 20px;
    right: 60px;
    z-index: 2000;
    font-size: 18px;
    border: none;
    outline: none;
    background-color: var(--accent-color);
    color: white;
    cursor: pointer;
    padding: 15px;
    border-radius: 50px;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
    
    /* New Visibility Logic */
    opacity: 0;            /* Invisible */
    pointer-events: none;  /* Unclickable when hidden */
    transition: opacity 0.3s, background-color 0.3s;
}

/* Add this new rule for when JS adds the class */
#backToTop.active {
    opacity: 1;            /* Visible */
    pointer-events: auto;  /* Clickable */
}

#backToTop:hover {
    background-color: #555;
}

/* =========================
   ANIMATIONS
========================= */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =========================
   RESPONSIVE
========================= */
@media (max-width: 768px) {
   /* Stack navigation and button */
    header {
        flex-direction: column;
        padding: 15px 10px;
    }

    nav {
        flex-wrap: wrap;
        justify-content: center;
        margin-bottom: 10px;
    }

    nav a {
        margin: 5px 10px;
        font-size: 0.9rem;
    }

    /* Center Home content for better mobile balance */
    #home {
        align-items: center; 
        text-align: center;
        padding-left: 20px;
        padding-right: 20px;
    }

    #home h1 {
        font-size: 2.2rem;
    }

    section h2 {
        top: 100px; 
    }

    #home p {
        text-align: center; 
        margin: 0 auto 20px auto; /* Re-centers the paragraph */
    }

    /* Move social icons from bottom-right to below the text */
    .social-icons-home {
        position: static; 
        margin-top: 20px;
        justify-content: center;
    }

    /* Adjust subsections for smaller screens */
    .subsection {
        padding: 20px;
    }

    /* Ensure containers fill the screen width */
    .about-container, .projects-container, .blog-container {
        width: 100%;
        padding: 0 10px;
    }

    /* Back to Top Button */
    #backToTop {
        bottom: 20px;
        right: 20px;
    }

    #backToTop.active {
        display: block;
    }
}