/* ADDED: Smooth scrolling for anchor links
CSS file of basicofweb3.html, advanceofweb3.html and developerroadmap.html
*/

html {
    scroll-behavior: smooth;
}

body {
    height: 100vh; 
    margin: 0;
    padding: 0;
    background: linear-gradient(90deg, #010538,#000000);
    background-size: cover;
    background-attachment: fixed;
    color: #ffffff; 
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    overflow-x: hidden;
    position: relative;
    width: 100%;
    min-width: 100%;
}


/*  _________________________________________________header section_______________________________________________ */

.top-section {
    width: 100%;
    padding: 20px;
    box-sizing: border-box;
    overflow: hidden;
}

header {
    width: 100%;
    max-width: 100%;
    box-sizing: border-box;
}

/* Header title: only apply left offset when no .header-title-container (course-only pages) */
header > #one {
    position: relative;
    left: 2cm;
    padding-left: 0;
    font-size: 50px;
    line-height: 1.5;
    color: #ffffff;
    font-weight: 900;
    -webkit-text-stroke: 0.5px #ffffff;
    text-shadow: 0 0 0.5px #ffffff, 0 0 1px #ffffff;
    -webkit-text-fill-color: #ffffff;
    animation: subtleGlow 2s ease-in-out infinite alternate;
    margin: 0;
    word-wrap: break-word;
}

#one {
    position: relative;
    padding-left: 0;
    font-size: 50px;
    line-height: 1.5;
    color: #ffffff;
    font-weight: 900;
    -webkit-text-stroke: 0.5px #ffffff;
    text-shadow: 0 0 0.5px #ffffff, 0 0 1px #ffffff;
    -webkit-text-fill-color: #ffffff;
    animation: subtleGlow 2s ease-in-out infinite alternate;
    margin: 0;
    word-wrap: break-word;
}

@keyframes subtleGlow {
    from {
        text-shadow: 0 0 0.5px #ffffff, 0 0 1px #ffffff;
    }
    to {
        text-shadow: 0 0 0.7px #ffffff, 0 0 1.2px #ffffff;
    }
}

#three {
    position: relative;
    font-style: italic;
    font-weight: bold;
    right: 0.5cm;
    padding-right: 0;
    font-size: 20px;
    line-height: 0.6;
    text-align: right;
    color: #ffffff;        
    opacity: 0;            
    animation: fadeInLoop 5s ease-in-out infinite alternate;
    margin: 0;
    word-wrap: break-word;
}

@keyframes fadeInLoop {
    0% {
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        opacity: 0;
    }
}


/*  ________________________________________________main section______________________________________________________ */

main {
    display: flex;
    justify-content: space-between;  
    align-items: flex-start;
    padding: 50px 50px;
    flex-wrap: nowrap;               
}


/* ============================================
   Course Content Section
   ============================================ */

.course-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
}

.course-header {
    text-align: center;
    margin-bottom: 40px;
}

.course-header h1 {
    font-size: 42px;
    color: #f9f9f9;
    margin-bottom: 15px;
    text-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
}

.course-header p {
    font-size: 18px;
    color: #ffffff;
    opacity: 0.9;
}

.pdf-section {
    margin-top: 40px;
}

.pdf-section h2 {
    font-size: 28px;
    color: #00aeff;
    margin-bottom: 25px;
    border-bottom: 2px solid rgba(0, 255, 255, 0.3);
    padding-bottom: 10px;
}

.pdf-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}

.pdf-item {
    background: linear-gradient(135deg, rgba(31, 31, 31, 0.8), rgba(53, 51, 205, 0.6));
    border: 2px solid rgba(0, 255, 255, 0.3);
    border-radius: 12px;
    padding: 25px;
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    cursor: pointer;
}

.pdf-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 0 25px rgba(0, 255, 255, 0.4);
    border-color: #00ffff;
}

.pdf-item h3 {
    font-size: 20px;
    color: #00aeff;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.pdf-item h3 i {
    font-size: 24px;
}

.pdf-item p {
    font-size: 14px;
    color: #ffffff;
    opacity: 0.8;
    margin-bottom: 15px;
}

.pdf-actions {
    display: flex;
    gap: 12px;
    margin-top: 10px;
}

.pdf-link,
.videoguide-link {
    display: inline-flex;
    flex: 1;
    align-items: center;
    gap: 8px;
    color: #ffffff;
    text-decoration: none;
    font-weight: 600;
    padding: 10px 20px;
    background: rgba(0, 255, 255, 0.1);
    border: 1px solid rgba(0, 255, 255, 0.3);
    border-radius: 6px;
    transition: all 0.3s ease;
    white-space: nowrap;

}

.pdf-link:hover,
.videoguide-link:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: #00ffff;
    color: #00ffff;
    text-shadow: 0 0 5px rgba(0, 255, 255, 0.5);
}

.pdf-viewer-container {
    margin-top: 30px;
    background: rgba(0, 0, 0, 0.3);
    border: 2px solid rgba(0, 255, 255, 0.3);
    border-radius: 12px;
    padding: 20px;
    min-height: 600px;
}

.pdf-viewer-container iframe {
    width: 100%;
    height: 800px;
    border: none;
    border-radius: 8px;
    background: #ffffff;
}

/* ============================================
   X Post Horizontal Banner
   ============================================ */

.x-post-banner {
    margin-top: 40px;
    background: linear-gradient(90deg, rgba(0, 255, 255, 0.06), rgba(0, 0, 0, 0.5));
    border-top: 2px solid rgba(0, 255, 255, 0.4);
    border-bottom: 2px solid rgba(0, 255, 255, 0.4);
    border-left: 2px solid rgba(0, 255, 255, 0.25);
    border-right: 2px solid rgba(0, 255, 255, 0.25);
    border-radius: 6px;
    padding: 8px 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    box-shadow: none;
    width: 100%;
    box-sizing: border-box;
}

/* Make the banner span the width of three PDF boxes in the grid on large screens */
.pdf-list .x-post-banner {
    grid-column: span 3;
}

.x-post-text {
    text-align: justify;
}

.x-post-text h3 {
    margin: 0 0 6px 0;
    font-size: 20px;
    color: #00aeff;
}

.x-post-text p {
    margin: 0;
    font-size: 14px;
    color: #ffffff;
    opacity: 0.9;
}

.x-post-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 999px;
    background: #000000;
    color: #ffffff;
    text-decoration: none;
    font-weight: 700;
    border: 1px solid #00ffff;
    transition: all 0.25s ease;
    white-space: nowrap;
}

.x-post-link i {
    font-size: 18px;
}

.x-post-link:hover {
    background: #00ffff;
    color: #000000;
    box-shadow: 0 0 18px rgba(0, 255, 255, 0.6);
    transform: translateY(-2px);
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: #00ffff;
    text-decoration: none;
    font-weight: 600;
    margin-bottom: 30px;
    padding: 10px 20px;
    background: rgba(0, 255, 255, 0.1);
    border: 1px solid rgba(0, 255, 255, 0.3);
    border-radius: 8px;
    transition: all 0.3s ease;
}

.back-link:hover {
    background: rgba(0, 255, 255, 0.2);
    border-color: #00ffff;
    text-shadow: 0 0 5px rgba(0, 255, 255, 0.5);
    transform: translateX(-5px);
}



/* ============================================
   Mobile Responsiveness - Header Section
   ============================================ */

@media (max-width: 768px) {
    .top-section {
        padding: 15px;
    }

    #one {
        font-size: 32px;
        padding-left: 15px;
        line-height: 1.3;
        left: 0;
    }

    #three {
        font-size: 16px;
        padding-right: 15px;
        line-height: 1.3;
        right: 0;
        margin-top: 8px;
    }

    /* Mobile: Stack boxes vertically */
    main {
        flex-direction: column;
        align-items: stretch;
        padding: 30px 20px;
        gap: 30px;
    }

    .follower-content {
        max-width: 100%;
        width: 100%;
    }

    .box {
        margin-left: 0;
        width: 100%;
    }

    .course-container {
        padding: 30px 15px;
    }

    .course-header h1 {
        font-size: 32px;
    }

    .course-header p {
        font-size: 16px;
    }

    .pdf-list {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .pdf-viewer-container iframe {
        height: 500px;
    }

    /* Footer mobile responsiveness */
    .lastsection {
        padding: 20px 20px;
    }

    .lastsection .social-links {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
        flex-wrap: wrap;
        justify-content: flex-start;
        font-size: 14px;
    }

    .lastsection .social-links a {
        font-size: 14px;
        display: block;
        width: 100%;
        white-space: normal;
    }

    #last {
        text-align: left;
        font-size: 16px;
        margin-top: 10px;
    }
}

@media (max-width: 600px) {
    .top-section {
        padding: 12px;
    }

    #one {
        font-size: 28px;
        padding-left: 12px;
        line-height: 1.2;
        left: 0;
    }

    #three {
        font-size: 14px;
        padding-right: 12px;
        line-height: 1.2;
        right: 0;
        margin-top: 6px;
    }

    /* Mobile: Stack boxes vertically */
    
    main {
        flex-direction: column;
        align-items: stretch;
        padding: 25px 15px;
        gap: 25px;
    }

    .follower-content {
        max-width: 100%;
        width: 100%;
    }

    .follower-content h2 {
        font-size: 22px;
    }

    .follower-content p {
        font-size: 16px;
    }

    .box {
        margin-left: 0;
        width: 100%;
        padding: 25px;
    }

    .box h2 {
        font-size: 22px;
    }

    .box p {
        font-size: 16px;
    }

    .course-container {
        padding: 25px 12px;
    }

    .course-header h1 {
        font-size: 28px;
    }

    .pdf-section h2 {
        font-size: 24px;
    }

    .pdf-item {
        padding: 20px;
    }

    .pdf-item h3 {
        font-size: 18px;
    }

    .pdf-viewer-container {
        padding: 15px;
    }

    .pdf-viewer-container iframe {
        height: 400px;
    }
 
    
}

@media (max-width: 480px) {
    .top-section {
        padding: 10px;
    }

    #one {
        font-size: 24px;
        padding-left: 10px;
        line-height: 1.2;
    }

    #three {
        font-size: 12px;
        padding-right: 10px;
        line-height: 1.2;
    }

    /* Mobile: Stack boxes vertically */
    main {
        flex-direction: column;
        align-items: stretch;
        padding: 20px 12px;
        gap: 20px;
    }

    .follower-content {
        max-width: 100%;
        width: 100%;
    }

    .follower-content h2 {
        font-size: 20px;
    }

    .follower-content p {
        font-size: 15px;
    }

    .box {
        margin-left: 0;
        width: 100%;
        padding: 20px;
    }

    .box h2 {
        font-size: 20px;
    }

    .box p {
        font-size: 15px;
    }

    .course-container {
        padding: 20px 10px;
    }

    .course-header h1 {
        font-size: 24px;
    }

    .course-header p {
        font-size: 14px;
    }

    .pdf-section h2 {
        font-size: 20px;
    }

    .pdf-item {
        padding: 18px;
    }

    .pdf-item h3 {
        font-size: 16px;
    }

    .pdf-viewer-container iframe {
        height: 350px;
    }

}

@media (max-width: 360px) {
    #one {
        font-size: 20px;
        padding-left: 8px;
    }

    #three {
        font-size: 11px;
        padding-right: 8px;
    }

    /* Mobile: Stack boxes vertically */
    main {
        flex-direction: column;
        align-items: stretch;
        padding: 18px 10px;
        gap: 18px;
    }

    .follower-content {
        max-width: 100%;
        width: 100%;
    }

    .follower-content h2 {
        font-size: 18px;
    }

    .follower-content p {
        font-size: 14px;
    }

    .box {
        margin-left: 0;
        width: 100%;
        padding: 18px;
    }

    .box h2 {
        font-size: 18px;
    }

    .box p {
        font-size: 14px;
    }

    .course-container {
        padding: 18px 8px;
    }

    .course-header h1 {
        font-size: 20px;
    }

    .pdf-section h2 {
        font-size: 18px;
    }

    .pdf-item h3 {
        font-size: 14px;
    }

    .pdf-viewer-container iframe {
        height: 300px;
    }
}