/*================ Theme For Biology Final Touch SSC =================*/
:root{--bg-deep:#0b1020;--bg-ink:#0e1326;--glass:#0f172a;--glass-alpha:#0f172aa6;--text:#e5e7eb;--muted:#a1a1aa;--accent:#7c3aed;--accent-2:#22c55e;--danger:#f43f5e;--ring:#2e344b;--shadow-strong:0 20px 60px #00000073 inset 0 1px 0 #ffffff05;--shadow-soft:#0000004d;--radius:18px;--bg-primary-light:#f8fafc;--bg-secondary-light:#fff;--text-primary-light:#1e293b;--text-secondary-light:#475569;--primary-color:#6c8dfa;--text-color:#f0f0f0;--bg-color:#1a1a1a;--menu-bg:#2d2d2d;--header-bg:#242424;--transition:all .3s ease;--menu-width:280px;--td-border:#8b8c89;--card-bg:#2d2d2d;--btn-primary:#6c8dfa;--btn-warning:#5a189a;--btn-info:#17a2b8;--btn-success:#28a745;--btn-text:#fff;--heading-color:#ffee32;--hover-bg:#343a40}

[data-theme="light"]{--bg-deep:#f1f5f9;--bg-ink:#f8fafc;--glass:#fff;--glass-alpha:#fffc;--text:#1e293b;--muted:#64748b;--accent:#7c3aed;--accent-2:#22c55e;--danger:#f43f5e;--ring:#e2e8f0;--shadow-strong:0 20px 60px #0000001a inset 0 1px 0 #00000005;--shadow-soft:#0000001a;--primary-color:#4a6cf7;--text-color:#333;--bg-color:#f9f9f9;--menu-bg:#fff;--header-bg:#fff;--td-border:#0000001a;--card-bg:#fff;--btn-primary:#4a6cf7;--btn-warning:#ffc107;--btn-info:#17a2b8;--btn-success:#28a745;--btn-text:#fff;--heading-color:#323031;--hover-bg:#f4d58d}


*{margin:0;padding:0;box-sizing:border-box;transition:background-color .3s ease,color .3s ease,border-color .3s ease,transform .3s ease}
html{scroll-behavior: smooth;}
html,body{height:100%; font-family:'Kalpurush',Arial,sans-serif}
body{margin:0;color:var(--text);font-family:"Kalpurush","Poppins","Noto Sans Bengali",system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;line-height:1.5;background:repeating-linear-gradient(145deg,#ffffff04 0,#ffffff04 2px,transparent 2px,transparent 6px),url('data:image/svg+xml;utf8,\ <svg xmlns="http://www.w3.org/2000/svg" width="140" height="140" viewBox="0 0 140 140">\ <filter id="n"><feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="2" stitchTiles="stitch"/></filter>\ <rect width="100%" height="100%" filter="url(%23n)" opacity="0.035"/></svg>'),radial-gradient(1200px 800px at 10% 0%,#1f2a6b 0%,transparent 55%),radial-gradient(900px 600px at 90% 100%,#0b6b4a 0%,transparent 55%),radial-gradient(600px 400px at 60% 40%,#5b21b6 0%,transparent 55%),linear-gradient(180deg,var(--bg-ink),var(--bg-deep));background-attachment:fixed,fixed,fixed,fixed,fixed,fixed;display:flex;flex-direction:column;padding:0}
[data-theme="light"] body{background:repeating-linear-gradient(145deg,#00000004 0,#00000004 2px,transparent 2px,transparent 6px),url('data:image/svg+xml;utf8,\ <svg xmlns="http://www.w3.org/2000/svg" width="140" height="140" viewBox="0 0 140 140">\ <filter id="n"><feTurbulence type="fractalNoise" baseFrequency="0.9" numOctaves="2" stitchTiles="stitch"/></filter>\ <rect width="100%" height="100%" filter="url(%23n)" opacity="0.035"/></svg>'),radial-gradient(1200px 800px at 10% 0%,#1f2a6b1a 0%,transparent 55%),radial-gradient(900px 600px at 90% 100%,#0b6b4a1a 0%,transparent 55%),radial-gradient(600px 400px at 60% 40%,#5b21b61a 0%,transparent 55%),linear-gradient(180deg,var(--bg-ink),var(--bg-deep))}

.container{max-width:1200px;margin:0 auto;padding:0 20px; width: 100%}
header{background-color:var(--glass-alpha);box-shadow:var(--shadow);position:sticky;top:0;z-index:1000;backdrop-filter:blur(10px);border-bottom:1px solid var(--ring)}
.header-container{display:flex;justify-content:space-between;align-items:center;padding:15px 0}
.logo{display:flex;align-items:center;gap:12px}
.logo img{height:45px;width:auto;border-radius:10px;box-shadow:0 4px 12px #0003}
.logo-text{font-weight:700;font-size:1.3rem;background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.desktop-menu{display:flex;align-items:center;gap:20px}
.nav-menu{display:flex;list-style:none;gap:5px}
.nav-menu a{text-decoration:none;color:var(--text);padding:10px 16px;border-radius:var(--radius);font-weight:500;position:relative;overflow:hidden;font-size:.95rem}
.nav-menu a::before{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:linear-gradient(135deg,var(--accent),var(--accent-2));transition:width .3s ease}
.nav-menu a:hover::before{width:100%}
.nav-menu a:hover{color:var(--accent);background-color:var(--ring)}

.bn{font-family:'Kalpurush',Arial,sans-serif}
.en{font-family:Arial,sans-serif}
.theme-toggle{background:var(--glass);border:1px solid var(--ring);cursor:pointer;font-size:1.2rem;color:var(--text);padding:10px;border-radius:50%;display:flex;align-items:center;justify-content:center;width:45px;height:45px;box-shadow:var(--shadow);transition:all .3s ease}
.theme-toggle:hover{transform:rotate(15deg);box-shadow:0 5px 15px #0000004d}

.mobile-header-controls{display:none;align-items:center;gap:10px}
.mobile-menu-toggle{background:var(--glass);border:1px solid var(--ring);cursor:pointer;font-size:1.2rem;color:var(--text);padding:10px;border-radius:10px;width:45px;height:45px;box-shadow:var(--shadow);display:flex;align-items:center;justify-content:center}
.mobile-menu{position:fixed;top:0;right:-100%;width:85%;max-width:350px;height:100vh;background-color:var(--glass);box-shadow:var(--shadow);z-index:1001;transition:right .4s cubic-bezier(0.4,0,0.2,1);padding:25px;overflow-y:auto;display:flex;flex-direction:column;border-left:1px solid var(--ring)}
.mobile-menu.active{right:0}
.mobile-menu-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px;padding-bottom:15px;border-bottom:1px solid var(--ring)}
.mobile-menu-close{background:var(--glass);border:1px solid var(--ring);cursor:pointer;font-size:1.2rem;color:var(--text);padding:8px;border-radius:10px;width:40px;height:40px;display:flex;align-items:center;justify-content:center}
.mobile-nav-menu{list-style:none;display:flex;flex-direction:column;gap:10px}
.mobile-nav-menu a{display:block;text-decoration:none;color:var(--text);padding:15px;border-radius:var(--radius);font-weight:500;background:var(--glass);border:1px solid var(--ring);transition:all .3s ease}
.mobile-nav-menu a:hover{background:var(--accent);color:#fff;transform:translateX(5px)}
.menu-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background-color:#00000080;z-index:1000;opacity:0;visibility:hidden;transition:opacity .3s ease-in-out}
.menu-overlay.active{opacity:1;visibility:visible}


.hero{padding:100px 0;position:relative;flex:1}
/*.hero::before{content:'';position:absolute;top:-50%;right:-10%;width:500px;height:500px;border-radius:50%;background:linear-gradient(135deg,var(--accent),var(--accent-2));opacity:.1;filter:blur(50px)}*/
.hero-content{width:100%;position:relative;z-index:1}
.hero-title{font-size:3rem;margin-bottom:20px;line-height:1.2;background:linear-gradient(135deg,var(--accent),var(--accent-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-description{font-size:1.2rem;color:var(--muted);margin-bottom:30px}
.hero-buttons{display:flex;gap:15px}


a{text-decoration: none; color: inherit;}

.btn{padding:12px 25px;border-radius:var(--radius);font-weight:600;cursor:pointer;border:none;font-family:'Kalpurush',Arial,sans-serif;transition:all .3s ease;display:inline-flex;align-items:center;gap:8px; text-decoration: none}
.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;box-shadow:0 4px 15px #7c3aed4d}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 6px 20px #7c3aed66}
.btn-secondary{background:var(--glass);color:var(--text);border:1px solid var(--ring)}
.btn-secondary:hover{background:var(--accent);color:#fff}
main{padding:60px 0}

.section{margin-bottom:80px}
.section-title{font-size:2.2rem;margin-bottom:40px;color:var(--text);text-align:center;position:relative;padding-bottom:15px}
.section-title::after{content:'';position:absolute;bottom:0;left:50%;transform:translateX(-50%);width:80px;height:4px;background:linear-gradient(135deg,var(--accent),var(--accent-2));border-radius:2px}


.form-container{background-color:var(--glass);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow);margin-bottom:40px;border:1px solid var(--ring)}
.form-group{margin-bottom:25px}
.form-group label{display:block;margin-bottom:8px;font-weight:600;color:var(--text)}
.form-control{width:100%;padding:14px 16px;border:1px solid var(--ring);border-radius:var(--radius);background-color:var(--glass);color:var(--text);font-family:'Kalpurush',Arial,sans-serif;transition:all .3s ease}
.form-control:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #7c3aed33}
.select-wrapper{position:relative}
.select-wrapper::after{content:"▼";position:absolute;right:16px;top:50%;transform:translateY(-50%);pointer-events:none;color:var(--muted);font-size:.8rem}
textarea.form-control{min-height:120px;resize:vertical}
.btn-submit{background:linear-gradient(135deg,var(--accent),var(--accent-2));color:#fff;border:none;padding:14px 30px;border-radius:var(--radius);cursor:pointer;font-family:'Kalpurush',Arial,sans-serif;font-weight:600;font-size:1rem;transition:all .3s ease;box-shadow:0 4px 15px #7c3aed4d;}
.btn-submit:hover{transform:translateY(-3px);box-shadow:0 6px 20px #7c3aed66}


.content-container{background-color:var(--glass);border-radius:var(--radius);padding:40px;box-shadow:var(--shadow);margin-bottom:40px;border:1px solid var(--ring)}
.content-container h3{margin-bottom:20px;color:var(--accent)}
.content-container ul{padding-left:20px;margin-bottom:20px}
.content-container li{margin-bottom:10px;position:relative;padding-left:15px}
.content-container li::before{content:'•';color:var(--accent);position:absolute;left:0}


.posts-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:30px}
.post-card{background-color:var(--glass);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow);transition:all .3s ease;border:1px solid var(--ring)}
.post-card:hover{transform:translateY(-10px);box-shadow:0 25px 50px #0000004d}
.post-image{height:200px;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:flex;align-items:center;justify-content:center;color:#fff;font-size:1.5rem;font-weight:700;position:relative;overflow:hidden}
.post-image::after{content:'';position:absolute;top:0;left:0;width:100%;height:100%;background:#0003}
.post-content{padding:25px}
.post-title{font-size:1.3rem;margin-bottom:12px;color:var(--text);line-height:1.4}
.post-excerpt{color:var(--muted);margin-bottom:20px;line-height:1.6}
.post-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:.9rem}
.post-tag{background:var(--ring);padding:4px 10px;border-radius:20px;font-size:.8rem}


footer{background-color:var(--glass);padding:60px 0 30px;border-top:1px solid var(--ring)}
.footer-container{display:flex;flex-wrap:wrap;justify-content:space-between;gap:40px}
.footer-about{flex:0 0 60%;padding-right:20px}
.footer-links{flex:0 0 35%}
.footer-title{font-size:1.5rem;margin-bottom:20px;color:var(--text);position:relative;padding-bottom:10px}
.footer-title::after{content:'';position:absolute;bottom:0;left:0;width:40px;height:3px;background:linear-gradient(135deg,var(--accent),var(--accent-2));border-radius:2px}
.footer-description{color:var(--muted);margin-bottom:25px;line-height:1.7}
.footer-links ul{list-style:none;display:grid;grid-template-columns:1fr 1fr;gap:10px}
.footer-links li{margin-bottom:12px}
.footer-links a{text-decoration:none;color:var(--muted);transition:all .3s ease;display:flex;align-items:center;gap:8px}
.footer-links a:hover{color:var(--accent);transform:translateX(5px)}
.copyright{text-align:center;padding-top:30px;margin-top:40px;border-top:1px solid var(--ring);color:var(--muted);font-size:.9rem}


  /*------------- YouTube Video CSS------------------- */
.wrapper {max-width: 680px;margin: 0;padding: 0; width: 100%; margin: 0 auto;}
.youtube {background-image:url('<?=$home_url ?>image/video-placeholder.webp') ; background-size: cover; box-shadow: 0 4px 8px 0 rgba(0, 0, 0, 0.2), 0 6px 20px 0 rgba(0, 0, 0, 0.19); position: relative;padding-top: 56.25%;overflow: hidden;cursor: pointer;}
.youtube img {width: 100%;top: -16.82%;left: 0;opacity: 0.95;}
.youtube .play-button {width: 90px;height: 60px;background-color: #333; box-shadow: 0 0 30px rgba( 0,0,0,0.6 ); z-index: 1;opacity: 1;border-radius: 6px;}
.youtube .play-button:before {content: "";border-style: solid;border-width: 15px 0 15px 26.0px;border-color: transparent transparent transparent #fff;}
.youtube img,.youtube .play-button {cursor: pointer;background-color: red;}
.youtube img,.youtube iframe,.youtube .play-button,.youtube .play-button:before {position: absolute}
.youtube .play-button,.youtube .play-button:before {top: 50%;left: 50%;transform: translate3d( -50%, -50%, 0 );}
.youtube iframe {height: 100%;width: 100%;top: 0;left: 0;}



/* --- Nornal button best for dark theme ----- */
.btn-dark{display:inline-block;padding:12px 28px;font-size:1rem;font-weight:600;border:none;border-radius:12px;cursor:pointer;color:#fff;background:linear-gradient(135deg,#0d6efd,#6610f2);box-shadow:0 4px 12px #00000080;transition:all .3s ease;position:relative;overflow:hidden; text-decoration: none}
.btn-dark::before{content:"";position:absolute;top:0;left:-100%;width:80%;height:100%;background:linear-gradient(120deg,transparent,#fff3,transparent);transition:all .4s ease}
.btn-dark:hover::before{left:120%}
.btn-dark:hover{transform:translateY(-2px) scale(1.03);box-shadow:0 6px 20px #0d6efd99 0 0 12px #6610f299}
.btn-dark:active{transform:scale(0.97);box-shadow:0 3px 8px #0009}


/*---------- Card (Advanced) Design  -----------*/
.cardadv{border-radius:10px;margin-bottom:30px;}
.card-head{background-color: var(--header-bg);color: var(--heading-color);padding:20px 25px 15px 25px; border-radius: 10px 10px 0 0; border:1px solid var(--td-border)}
.card-body{background-color:var(--card-bg);box-shadow:0 5px 15px var(--shadow);border:1px solid var(--td-border); border-top: 0 !important;padding:25px;border-radius:0 0 10px 10px;}


/* ------------------ Normal Card ---------------- */
.card{background-color:var(--card-bg);border-radius:10px;padding:25px;margin-bottom:30px;box-shadow:0 5px 15px var(--shadow);border:1px solid var(--td-border)}


/* --------------------  Scroll to Top  ------------------- */
#scrollTopBtn{position:fixed;bottom:30px;right:30px;z-index:99;background-color:var(--bg-color);color:var(--text-color);border:3px solid var(--ring);outline:none;padding:12px 18px;border-radius:50%;font-size:20px;cursor:pointer;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:opacity .3s ease,transform .3s ease}
#scrollTopBtn.visible{opacity:1;pointer-events:auto;transform:scale(1)}
#scrollTopBtn:hover{background-color:var(--accent);transform:scale(1.1)}




@media (max-width: 1100px) {
.nav-menu a{padding:10px 12px;font-size:.9rem}
}

@media (max-width: 992px) {
.footer-about,.footer-links{flex:0 0 100%;margin-bottom:40px}
.footer-about{padding-right:0}
.hero-title{font-size:2.5rem}
.nav-menu{gap:2px}
.nav-menu a{padding:8px 10px;font-size:.85rem}
}


@media (max-width: 850px) {
.desktop-menu .nav-menu{display:none}
.mobile-header-controls{display:flex}
.posts-grid{grid-template-columns:1fr}
.hero-title{font-size:2rem}
.hero-buttons{flex-direction:column}
.form-container,.content-container{padding:25px}
.footer-links ul{grid-template-columns:1fr}
}


.fade-in{opacity:0;transform:translateY(20px);transition:opacity .6s ease,transform .6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}