/* =================================================================== */
/* === Shuvo Das Portfolio - Enhanced Stylesheet v2.0              === */
/* =================================================================== */

/* 
 * === TABLE OF CONTENTS ===
 * 1. Basic Reset & Global Styles
 * 2. Reusable Components & Utils
 * 3. Preloader & Header & Nav
 * 4. Hero Section
 * 5. About Section
 * 6. Skills Section
 * 7. Projects Section
 * 8. Contact Section
 * 9. Footer & Scroll To Top
 * 10. Secret Locker Section
 * 11. File Preview Modal Styles
 * 12. Responsive Design
*/


/* =================================== */
/* === 1. Basic Reset & Global Styles === */
/* =================================== */
:root {
    /* Color Palette */
    --primary-bg: #0A101E;
    --secondary-bg: #10182B;
    --card-bg: #171F30;
    --accent-neon: #00f0ff;
    --accent-pink: #FF00A0;
    --text-primary: #E0E8FF;
    --text-secondary: #A0ABC0;
    --text-heading: #FFFFFF;
    --border-color: #2A344B;
    --border-glow-color: rgba(0, 240, 255, 0.45);
    
    /* Font */
    --font-primary: 'Poppins', 'Hind Siliguri', sans-serif;
    
    /* Transparent Colors & Shadows */
    --accent-neon-transparent: rgba(0, 240, 255, 0.1);
    --accent-pink-transparent: rgba(255, 0, 160, 0.1);
    --card-hover-glow: 0 0 40px -10px var(--border-glow-color);

    /* Layout Variable */
    --header-height: 80px;
}

/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700;800&family=Hind+Siliguri:wght@400;500;600;700&display=swap');

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    scroll-behavior: smooth;
}

html {
    overflow-x: hidden;
    scroll-padding-top: var(--header-height); /* Header এর নিচে সেকশন শুরু হওয়ার জন্য */
}

body {
    font-family: var(--font-primary);
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.7;
    position: relative;
    width: 100%;
    overflow-x: hidden;
}

/* এই ক্লাসগুলো জাভাস্ক্রিপ্ট দিয়ে অ্যাড এবং রিমুভ করা হয় */
body.loading, body.no-scroll {
    overflow: hidden;
}

/* টেক্সট সিলেক্ট করলে যে রঙ দেখাবে */
::selection {
    background-color: var(--accent-pink);
    color: var(--text-heading);
}


/* =================================== */
/* === 2. Reusable Components & Utils === */
/* =================================== */

.short-intro{
    text-shadow: 2px 2px 5px blueviolet;
}



.section-title {
  text-shadow: 0 0 10px #00c2cb, 0 0 20px #8a2be2, 0 0 30px #8a2be2;
}




.lol{
    text-shadow: 2px 2px 5px blueviolet;
     color: whitesmoke;
}

.lol-2{
    text-shadow: 2px 2px 5px blueviolet;
     color: whitesmoke;
}




.css-background-effects { position: fixed; top: 0; left: 0; width: 100%; height: 100%; z-index: -1; overflow: hidden; background: var(--primary-bg); background-image: radial-gradient(circle at 15% 25%, rgba(0, 240, 255, 0.1) 0%, transparent 40%), radial-gradient(circle at 85% 75%, rgba(255, 0, 160, 0.1) 0%, transparent 40%), linear-gradient(160deg, var(--primary-bg) 0%, var(--secondary-bg) 100%); background-attachment: fixed; }
a { text-decoration: none; color: var(--accent-neon); transition: color 0.3s ease; }
a:hover { color: var(--accent-pink); }
h1, h2, h3, h4 { color: var(--text-heading); margin-bottom: 1.2rem; font-weight: 700; letter-spacing: 0.5px; }
h1 { font-size: clamp(2.8rem, 6vw, 4.8rem); line-height: 1.15; }
h2 { font-size: clamp(2.3rem, 4.8vw, 3.3rem); }
h3 { font-size: clamp(1.6rem, 3.6vw, 2.3rem); }
img { max-width: 100%; height: auto; display: block; border-radius: 8px; }
.section-padding { padding: 120px 6%; }
.section-title { text-align: center; margin-bottom: 75px; position: relative; display: inline-block; left: 50%; transform: translateX(-50%); padding-bottom: 30px; }
.section-title::before, .section-title::after { content: ''; position: absolute; height: 4px; background: linear-gradient(90deg, var(--accent-pink), var(--accent-neon)); border-radius: 4px; transition: all 0.6s cubic-bezier(0.25, 1, 0.5, 1); }
.section-title::before { width: 0%; left: 0; bottom: 10px; }
.section-title::after { width: 0%; left: 0; bottom: 0px; opacity: 0.65; }
.aos-animate .section-title::before { width: 100%; }
.aos-animate .section-title::after { width: 60%; transition-delay: 0.2s; }
.section-subtitle { text-align: center; font-size: 1.15rem; margin: -55px auto 55px; color: var(--text-secondary); max-width: 680px; line-height: 1.8; }
.btn, .btn-cv, .btn-view-project, .btn-view-code { display: inline-flex; align-items: center; justify-content: center; padding: 14px 35px; border-radius: 50px; font-weight: 600; font-size: 1rem; text-transform: uppercase; letter-spacing: 1.3px; transition: all 0.4s cubic-bezier(0.25, 1, 0.5, 1); position: relative; overflow: hidden; border: 2px solid transparent; }
.btn span, .btn-cv span { margin-right: 8px; }
.btn i, .btn-cv i { transition: transform 0.3s ease; }
.btn:hover, .btn-cv:hover { transform: translateY(-4px) scale(1.02); box-shadow: 0 10px 25px -8px rgba(0, 0, 0, 0.3); }
.btn:hover i, .btn-cv:hover i { transform: translateX(3px); }
.btn-primary { background: linear-gradient(45deg, var(--accent-neon), var(--accent-pink)); color: var(--primary-bg); }
.btn-primary:hover { box-shadow: 0 5px 25px -5px var(--accent-pink); }
.btn-secondary { background: transparent; color: var(--accent-neon); border: 2px solid var(--accent-neon); }
.btn-secondary:hover { background-color: var(--accent-neon-transparent); border-color: var(--accent-pink); color: var(--accent-pink); box-shadow: 0 5px 25px -5px var(--accent-neon-transparent); }
.btn-cv { background: var(--accent-pink); color: white; }
.btn-cv:hover { background: var(--accent-neon); color: var(--primary-bg); box-shadow: 0 0 20px -5px var(--accent-neon); }


/* =================================== */
/* === 3. Preloader & Header & Nav    === */
/* =================================== */

#preloader { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: var(--primary-bg); z-index: 9999; display: flex; flex-direction: column; justify-content: center; align-items: center; transition: opacity 0.7s ease, visibility 0.7s ease; visibility: visible; opacity: 1; }
.preloader-logo-container { display: flex; margin-bottom: 22px; }
.preloader-initial { font-size: 3.2rem; font-weight: 700; color: var(--accent-neon); text-shadow: 0 0 12px var(--accent-neon); animation: bounceInitial 1.1s infinite ease-in-out; }
.preloader-initial:last-child { color: var(--accent-pink); text-shadow: 0 0 12px var(--accent-pink); animation-delay: 0.25s; }
@keyframes bounceInitial { 0%, 100% { transform: translateY(0) scale(1); } 50% { transform: translateY(-8px) scale(1.05); } }
.preloader-dots { display: flex; }
.preloader-dots .dot { width: 11px; height: 11px; background-color: var(--text-secondary); border-radius: 50%; margin: 0 5px; animation: scaleDot 1.3s infinite ease-in-out; }
.preloader-dots .dot:nth-child(2) { animation-delay: 0.18s; }
.preloader-dots .dot:nth-child(3) { animation-delay: 0.36s; }
@keyframes scaleDot { 0%, 80%, 100% { transform: scale(0.2); opacity: 0.5; } 40% { transform: scale(1.0); opacity: 1; } }
.loading-text { margin-top: 18px; color: var(--text-secondary); font-size: 1.05rem; letter-spacing: 1.2px; text-transform: uppercase; animation: fadeInOutText 1.8s infinite ease-in-out; }
@keyframes fadeInOutText { 0%, 100% { opacity: 0.6; } 50% { opacity: 1; } }
header { height: var(--header-height); background-color: rgba(10, 16, 30, 0.75); backdrop-filter: blur(18px); padding: 0 6%; position: sticky; top: 0; width: 100%; z-index: 1000; display: flex; align-items: center; border-bottom: 1px solid transparent; border-image: linear-gradient(to right, transparent, var(--border-glow-color), transparent) 1; transition: height 0.3s ease; }
nav { width: 100%; display: flex; justify-content: space-between; align-items: center; }
nav .logo a { font-size: 2.2rem; font-weight: 700; background: linear-gradient(45deg, var(--accent-neon) 30%, var(--accent-pink) 70%); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; transition: filter 0.3s ease; }
nav .logo a:hover { filter: brightness(1.2); }
nav .nav-links { display: flex; list-style: none; }
nav .nav-links li { margin-left: 35px; }
nav .nav-links a { color: var(--text-secondary); font-weight: 500; padding: 12px 5px; position: relative; transition: color 0.3s ease, text-shadow 0.3s ease; }
nav .nav-links a::after { content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 3px; background: linear-gradient(90deg, var(--accent-pink), var(--accent-neon)); border-radius: 2px; transition: width 0.4s cubic-bezier(0.25, 1, 0.5, 1); }
nav .nav-links a:hover, nav .nav-links a.active { color: var(--text-heading); text-shadow: 0 0 10px var(--accent-neon-transparent); }
nav .nav-links a:hover::after, nav .nav-links a.active::after { width: 100%; }
.burger { display: none; cursor: pointer; }
.burger div { width: 30px; height: 3.5px; background-color: var(--text-heading); margin: 7px 0; border-radius: 3px; transition: all 0.5s ease; }


/* =================================== */
/* === 4. Hero Section               === */
/* =================================== */
.hero { min-height: 100vh; display: flex; flex-direction: column; justify-content: center; align-items: center; padding: 120px 6% 65px; text-align: center; }
.hero-content { display: flex; flex-direction: column-reverse; align-items: center; gap: 40px; max-width: 1200px; width: 100%; margin-bottom: 70px; }
.hero .greeting { font-family: 'Fira Code', monospace; font-size: 1.2rem; color: var(--accent-neon); background-color: var(--accent-neon-transparent); padding: 6px 15px; border-radius: 20px; display: inline-block; margin-bottom: 15px; }
.name-shine { background: linear-gradient(90deg, var(--accent-neon), var(--text-heading) 50%, var(--accent-pink)); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; animation: shineText 4s linear infinite; background-size: 250% auto; }
@keyframes shineText { to { background-position: -150% center; } }
.hero .tagline { font-size: clamp(1.6rem, 4.2vw, 2.5rem); margin-bottom: 30px; }
.dynamic-text { color: var(--accent-pink); font-weight: 600; border-right: 3px solid var(--accent-pink); animation: blinkCursorSmooth 0.7s infinite step-end; padding-right: 6px; }
@keyframes blinkCursorSmooth { 50% { border-color: transparent; } }
.hero .short-intro { font-size: 1.1rem; margin-bottom: 35px; color: var(--text-secondary); max-width: 600px; margin-left:auto; margin-right:auto; }
.hero-image-container { position: relative; width: 280px; height: 280px; }
.profile-pic { width: 100%; height: 100%; border-radius: 50%; object-fit: cover; border: 8px solid var(--secondary-bg); position: relative; z-index: 2; box-shadow: 0 10px 40px rgba(0,0,0,0.4); }
.image-glow-ring { position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); border-radius: 50%; animation: rotateRing 15s linear infinite; }
.image-glow-ring.ring1 { width: calc(100% + 28px); height: calc(100% + 28px); border: 2.5px solid var(--accent-neon); opacity: 0.7; }
.image-glow-ring.ring2 { width: calc(100% + 56px); height: calc(100% + 56px); border: 2px dashed var(--accent-pink); animation-direction: reverse; opacity: 0.7; }
@keyframes rotateRing { to { transform: translate(-50%, -50%) rotate(360deg); } }
.hero-stats { display: flex; justify-content: space-around; flex-wrap: wrap; gap: 25px; background-color: rgba(23, 31, 48, 0.8); backdrop-filter: blur(10px); padding: 30px; border-radius: 16px; width: 100%; max-width: 980px; margin-top: 40px; border: 1px solid var(--border-glow-color); }
.stat-item { text-align: center; min-width: 145px; transition: transform 0.3s ease; }
.stat-item:hover { transform: translateY(-5px); }
.stat-item h3 { font-size: 2.5rem; color: var(--accent-neon); }
.stat-item p { font-size: 0.95rem; color: var(--text-secondary); text-transform: uppercase; }
.scroll-down-indicator { position: absolute; bottom: 35px; left: 50%; transform: translateX(-50%); }
.scroll-down-indicator i { font-size: 2rem; color: var(--accent-neon); animation: bounceArrowSmooth 2.2s infinite; opacity: 0; }
.scroll-down-indicator i:first-child { animation-delay: 0s; }
.scroll-down-indicator i:last-child { animation-delay: 0.2s; position: absolute; top: 15px; left:0; }
@keyframes bounceArrowSmooth { 0% { transform: translateY(-10px); opacity: 0; } 50% { opacity: 1; } 100% { transform: translateY(10px); opacity: 0; } }


/* =================================== */
/* === 5. About Section               === */
/* =================================== */
#about { background-color: var(--secondary-bg); }
.about-content { display: flex; flex-direction: column; align-items: center; gap: 60px; max-width: 1100px; margin: 0 auto; }
.about-image-wrapper { position: relative; padding: 12px; flex-shrink: 0; }
.profile-pic-about { width: 100%; max-width: 400px; height: auto; border-radius: 18px; box-shadow: 0 15px 50px -10px rgba(0,0,0,0.5); }
.about-image-wrapper::before { content: ''; position: absolute; inset: 0; border-radius: 24px; padding: 3px; background: conic-gradient(from var(--angle), var(--accent-pink), var(--accent-neon), var(--accent-pink)); animation: spin 4s linear infinite; -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0); mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0); -webkit-mask-composite: xor; mask-composite: exclude; }
@property --angle { syntax: '<angle>'; initial-value: 0deg; inherits: false; }
@keyframes spin { to { --angle: 360deg; } }
.about-text { text-align: left; flex-grow: 1; }
.about-text h4 { color: var(--accent-pink); margin-top: 30px; }
.about-text ul { list-style: none; padding-left: 0; }
.about-text ul li { margin-bottom: 13px; padding-left: 32px; position: relative; transition: transform 0.3s ease; }
.about-text ul li:hover { transform: translateX(5px); }
.about-text ul li::before { content: '\f058'; font-family: 'Font Awesome 6 Free'; font-weight: 900; position: absolute; left: 0; top: 2px; color: var(--accent-neon); transition: color 0.3s ease, transform 0.3s ease; }
.about-text ul li:hover::before { color: var(--accent-pink); transform: scale(1.1); }


/* =================================== */
/* === 6. Skills Section              === */
/* =================================== */
.skills-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 38px; max-width: 1100px; margin: 0 auto 50px; }
.skill-category { background-color: var(--card-bg); padding: 35px; border-radius: 16px; border: 1px solid var(--border-color); transition: transform 0.4s ease, box-shadow 0.4s ease; }
.skill-category:hover { transform: translateY(-10px) scale(1.02); box-shadow: var(--card-hover-glow); }
.skill-category h4 { color: var(--accent-neon); border-bottom: 2px solid var(--border-glow-color); padding-bottom: 13px; }
.skill-item { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; margin-bottom: 18px; }
.skill-bar { width: 100%; height: 10px; background-color: var(--accent-neon-transparent); border-radius: 5px; overflow: hidden; margin: 5px 0; }
.skill-level { height: 100%; background: linear-gradient(90deg, #009a9e, var(--accent-neon)); width: 0; transition: width 1.5s cubic-bezier(0.25, 1, 0.5, 1); position: relative; }
.skill-level::before { content: ''; position: absolute; right: 0; top: 0; height: 100%; width: 10px; background: #fff; box-shadow: 0 0 10px 5px #fff; opacity: 0.6; filter: blur(1px); }
.skill-percentage { color: var(--accent-neon); font-weight: 500; }
.future-skill { background-color: var(--secondary-bg); padding: 11px 16px; border-radius: 7px; border-left: 3.5px solid var(--text-secondary); transition: all 0.3s ease; }
.future-skill:hover { background-color: var(--primary-bg); transform: translateX(5px); border-left-color: var(--accent-pink); }
.skill-icon-future, .skill-icon-future-text { margin-left: auto; color: var(--accent-neon); }
.language-skills { text-align: center; margin-top: 50px; }
.language-skills h4 { color: var(--accent-pink); }


/* =================================== */
/* === 7. Projects Section            === */
/* =================================== */
#projects { background-color: var(--secondary-bg); }
.projects-container { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 42px; max-width: 1200px; margin: 0 auto; }
.project-card { background-color: var(--card-bg); border-radius: 16px; overflow: hidden; border: 1px solid var(--border-color); transition: transform 0.4s ease, box-shadow 0.4s ease; }
.project-card:hover { transform: translateY(-10px); box-shadow: var(--card-hover-glow); }
.project-image-container { position: relative; height: 250px; overflow: hidden; }
.project-card img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s cubic-bezier(0.165, 0.84, 0.44, 1), filter 0.4s ease; }
.project-card:hover img { transform: scale(1.1); filter: brightness(0.7); }
.project-overlay { position: absolute; top: 0; left: 0; width: 100%; height: 100%; display: flex; align-items: center; justify-content: center; text-align: center; background: linear-gradient(to top, rgba(10, 16, 30, 0.95), rgba(10, 16, 30, 0.5)); opacity: 0; transition: opacity 0.5s ease; }
.project-card:hover .project-overlay { opacity: 1; }
.overlay-content { transform: translateY(20px); transition: transform 0.5s ease 0.1s; }
.project-card:hover .overlay-content { transform: translateY(0); }
.overlay-buttons { margin-top: 20px; }
.overlay-buttons .btn { padding: 12px 28px; font-size: 0.9rem; }
.project-info { padding: 30px; }
.project-info h3 { color: var(--accent-neon); transition: color 0.3s ease; }
.project-card:hover .project-info h3 { color: var(--accent-pink); }
.project-tags { margin-top: 20px; display: flex; flex-wrap: wrap; gap: 8px; }
.project-tags span { background-color: var(--accent-neon-transparent); color: var(--accent-neon); padding: 6px 13px; border-radius: 20px; font-size: 0.85rem; font-weight: 500; transition: all 0.3s ease; }
.project-card:hover .project-tags span { background-color: var(--accent-pink); color: white; transform: scale(1.05); }


/* =================================== */
/* === 8. Contact Section             === */
/* =================================== */
#contact { background-color: var(--primary-bg); }
.contact-container { display: flex; flex-wrap: wrap; gap: 50px; max-width: 1000px; margin: 0 auto; background: var(--card-bg); padding: 50px; border-radius: 18px; border: 1px solid var(--border-glow-color); box-shadow: 0 0 50px -20px var(--accent-neon-transparent); }
.contact-info, .contact-form-wrapper { flex: 1; min-width: 300px; }
.contact-info h3, .contact-form-wrapper h3 { color: var(--accent-neon); }
.contact-item { display: flex; align-items: center; gap: 20px; background-color: var(--secondary-bg); padding: 20px; border-radius: 12px; margin-bottom: 20px; transition: all 0.3s ease; }
.contact-item:hover { transform: translateY(-5px); background-color: var(--primary-bg); box-shadow: 0 5px 20px rgba(0,0,0,0.3); }
.contact-icon { font-size: 2rem; color: var(--accent-neon); }
.contact-detail h4 { font-size: 1rem; color: var(--text-secondary); margin-bottom: 5px; text-transform: uppercase; letter-spacing: 1px; }
.contact-detail a, .contact-detail p { font-size: 1.1rem; color: var(--text-primary); font-weight: 500; margin-bottom: 0; }
.contact-detail a:hover { color: var(--accent-pink); }
.contact-form .form-group { position: relative; margin-bottom: 40px; }
.contact-form input, .contact-form textarea { width: 100%; padding: 18px 0; border: none; border-bottom: 2px solid var(--border-color); background: transparent; color: var(--text-primary); font-size: 1.05rem; transition: border-color 0.3s ease; }
.contact-form input:focus, .contact-form textarea:focus { outline: none; border-bottom-color: var(--accent-neon); }
.contact-form label { position: absolute; top: 18px; left: 0; color: var(--text-secondary); pointer-events: none; transition: all 0.3s ease; }
.contact-form input:focus + label, .contact-form input:not(:placeholder-shown) + label, .contact-form textarea:focus + label, .contact-form textarea:not(:placeholder-shown) + label { top: -14px; font-size: 0.9rem; color: var(--accent-neon); }
.btn-submit { width: 100%; margin-top: 10px; }


/* =================================== */
/* === 9. Footer & Scroll To Top      === */
/* =================================== */
footer { text-align: center; padding: 40px 20px; border-top: 1px solid var(--border-glow-color); margin-top: 60px; }
.footer-social { margin-bottom: 20px; display: flex; justify-content: center; gap: 25px; }
.footer-social a { color: var(--text-secondary); font-size: 1.8rem; transition: all 0.3s ease; }
.footer-social a:hover { color: var(--accent-pink); transform: translateY(-5px) scale(1.1); }
footer p { color: var(--text-secondary); font-size: 1rem; }

#scrollToTopBtn { position: fixed; bottom: 25px; right: 25px; background-color: var(--accent-pink); color: white; border: none; border-radius: 50%; width: 50px; height: 50px; font-size: 1.5rem; cursor: pointer; display: none; align-items: center; justify-content: center; z-index: 998; opacity: 0; transition: all 0.4s ease; box-shadow: 0 0 20px -5px var(--accent-pink); }
#scrollToTopBtn:hover { background-color: var(--accent-neon); transform: translateY(-5px); box-shadow: 0 0 25px -5px var(--accent-neon); }


/* =================================== */
/* === 10. Secret Locker Section      === */
/* =================================== */
.locker-hidden-default {
    display: none;
}

.locker-container {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    max-width: 900px; 
    margin: 0 auto;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.locker-container.hidden {
    display: none; 
}

.locker-container h3 {
    color: var(--accent-neon);
    margin-bottom: 25px;
}

.locker-container h3 i {
    margin-right: 10px;
}

.password-form {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap; 
}

#password-input {
    padding: 14px 20px;
    border: 2px solid var(--border-color);
    background-color: var(--secondary-bg);
    color: var(--text-primary);
    border-radius: 50px;
    font-size: 1rem;
    width: 100%;
    max-width: 300px;
    transition: all 0.3s ease;
}

#password-input:focus {
    outline: none;
    border-color: var(--accent-neon);
    box-shadow: 0 0 15px var(--accent-neon-transparent);
}

.error-message {
    color: var(--accent-pink);
    min-height: 24px; 
    font-weight: 500;
}

.file-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); 
    gap: 25px;
    margin: 40px 0;
    text-align: left;
}

.file-item {
    display: flex;
    flex-direction: column; 
    background-color: var(--secondary-bg);
    padding: 20px;
    border-radius: 12px;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

.file-item:hover {
    transform: translateY(-5px) scale(1.02);
    background-color: var(--primary-bg);
    box-shadow: 0 8px 25px rgba(0,0,0,0.35);
}

.file-icon-name {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 12px;
}

.file-icon {
    font-size: 2.2rem;
    color: var(--accent-pink);
    width: 40px;
    text-align: center;
    flex-shrink: 0;
}

.file-info h4 {
    margin-bottom: 5px;
    color: var(--text-heading);
    font-size: 1.1rem;
}

.file-info p.file-description { 
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin: 0 0 15px 0;
    line-height: 1.5;
}

.file-actions {
    margin-top: auto; 
    display: flex;
    gap: 10px;
}

.file-actions .btn {
    padding: 10px 20px;
    font-size: 0.85rem;
    flex-grow: 1; 
}
.file-actions .btn-view {
    background-color: var(--accent-neon-transparent);
    color: var(--accent-neon);
    border: 1px solid var(--accent-neon);
}
.file-actions .btn-view:hover {
    background-color: var(--accent-neon);
    color: var(--primary-bg);
}


#lock-button {
    margin-top: 30px;
}

/* =================================== */
/* === 11. File Preview Modal Styles === */
/* =================================== */
.modal {
    display: none; 
    position: fixed;
    z-index: 2000; 
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto; 
    background-color: rgba(0,0,0,0.8); 
    backdrop-filter: blur(5px);
    animation: fadeInModal 0.3s ease-out;
}

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

.modal-content {
    background-color: var(--card-bg);
    margin: 5% auto; 
    padding: 0; 
    border: 1px solid var(--border-glow-color);
    border-radius: 10px;
    width: 90%;
    max-width: 800px; 
    box-shadow: 0 5px 25px rgba(0, 240, 255, 0.2);
    animation: slideInModal 0.4s ease-out;
    display: flex;
    flex-direction: column;
    max-height: 90vh; 
}

@keyframes slideInModal {
    from { transform: translateY(-50px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    padding: 15px 25px;
    background-color: var(--secondary-bg);
    color: var(--accent-neon);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    border-top-left-radius: 10px;
    border-top-right-radius: 10px;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.4rem;
}

.close-modal-btn {
    color: var(--text-secondary);
    font-size: 2rem;
    font-weight: bold;
    transition: color 0.3s ease;
}

.close-modal-btn:hover,
.close-modal-btn:focus {
    color: var(--accent-pink);
    text-decoration: none;
    cursor: pointer;
}

.modal-body {
    padding: 25px;
    overflow-y: auto; 
    flex-grow: 1; 
    text-align: center; 
}

.modal-body img,
.modal-body video,
.modal-body audio,
.modal-body iframe {
    max-width: 100%;
    max-height: 60vh; 
    height: auto;
    border-radius: 8px;
    margin: 0 auto; 
    display: block;
}
.modal-body audio {
    width: 100%;
}
.modal-body p { 
    color: var(--text-secondary);
    font-size: 1.1rem;
}


.modal-footer {
    padding: 15px 25px;
    background-color: var(--secondary-bg);
    text-align: right;
    border-top: 1px solid var(--border-color);
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
}

.modal-footer .btn {
    padding: 10px 25px;
}

/* =================================== */
/* === 12. Responsive Design         === */
/* =================================== */
/* For tablets and small desktops */
@media (min-width: 992px) {
    .hero-content { flex-direction: row; text-align: left; }
    .hero-image-container { order: 1; }
    .hero-text { order: 0; }
    .about-content { flex-direction: row; align-items: flex-start; }
    .about-image-wrapper { flex-basis: 40%; }
    .about-text { flex-basis: 60%; }
}

/* For mobile phones and tablets */
@media (max-width: 768px) {
    .section-padding { padding: 80px 5%; }
    .burger { display: block; z-index: 1002; }
    .nav-links { position: fixed; right: -100%; height: 100vh; top: 0; background-color: rgba(13, 18, 31, 0.98); backdrop-filter: blur(15px); display: flex; flex-direction: column; align-items: center; justify-content: center; width: 70%; transition: right 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55); z-index: 1001; }
    .nav-links li { margin: 25px 0; }
    nav .nav-links li { margin-left: 0; } /* Reset margin for mobile view */
    .nav-links a { font-size: 1.2rem; }
    .nav-active { right: 0; }
    .toggle .line1 { transform: rotate(-45deg) translate(-8px, 8px); }
    .toggle .line2 { opacity: 0; }
    .toggle .line3 { transform: rotate(45deg) translate(-5px, -6px); }
    .profile-pic-about { max-width: 300px; }
    .modal-content {
        width: 95%;
        margin: 10% auto;
    }
    .modal-header h3 {
        font-size: 1.2rem;
    }
    .file-grid {
        grid-template-columns: 1fr; /* ছোট স্ক্রিনে একটি কলাম */
    }
}

/* For small mobile phones */
@media (max-width: 480px) {
    .section-padding { padding: 70px 4%; }
    h1 { font-size: 2.5rem; }
    .hero-image-container { width: 220px; height: 220px; }
    .btn, .btn-cv { padding: 12px 25px; font-size: 0.9rem; }
    .hero-buttons { display: flex; flex-direction: column; align-items: center; gap: 15px; }
    .hero-stats { flex-direction: column; gap: 20px; }
    .contact-container { padding: 30px 20px; }
    .projects-container { grid-template-columns: 1fr; }
    .file-item {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }
    .file-item .btn {
        margin-top: 15px;
        width: 100%;
    }
}