:root{--primary:#6C3CE1;--primary-dark:#5A2FB8;--primary-light:#8B5CF6;--secondary:#F43F5E;--accent:#F59E0B;--success:#10B981;--dark:#0F0F1A;--dark-secondary:#1A1A2E;--dark-card:#232342;--text-primary:#FFFFFF;--text-secondary:#A0A0B8;--text-muted:#6B6B85;--glass-bg:rgba(255,255,255,0.05);--glass-border:rgba(255,255,255,0.1);--shadow:0 25px 50px -12px rgba(0,0,0,0.5);--shadow-glow:0 0 40px rgba(108,60,225,0.3);--radius:20px;--radius-sm:12px;--transition:all 0.4s cubic-bezier(0.4,0,0.2,1)}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Inter',sans-serif;background:var(--dark);color:var(--text-primary);overflow-x:hidden;line-height:1.6}
#loading-screen{position:fixed;top:0;left:0;width:100%;height:100%;background:var(--dark);display:flex;justify-content:center;align-items:center;z-index:9999;transition:opacity .8s ease,visibility .8s ease}
#loading-screen.hidden{opacity:0;visibility:hidden}
.loader-container{text-align:center}
.premium-loader{width:80px;height:80px;margin:0 auto 30px;border:4px solid transparent;border-top:4px solid var(--primary);border-right:4px solid var(--secondary);border-radius:50%;animation:ls 1s linear infinite;position:relative}
.premium-loader::before{content:'';position:absolute;top:10px;left:10px;right:10px;bottom:10px;border:4px solid transparent;border-bottom:4px solid var(--accent);border-left:4px solid var(--primary-light);border-radius:50%;animation:ls .8s linear infinite reverse}
@keyframes ls{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}
.loader-text{font-size:2rem;font-weight:800;background:linear-gradient(135deg,var(--primary),var(--secondary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;margin-bottom:10px}
.loader-subtext{color:var(--text-secondary);font-size:1rem;animation:pt 1.5s ease-in-out infinite}
@keyframes pt{0%,100%{opacity:.6}50%{opacity:1}}
.navbar{position:fixed;top:0;left:0;width:100%;z-index:1000;padding:15px 0;background:rgba(15,15,26,0.85);backdrop-filter:blur(20px);border-bottom:1px solid var(--glass-border);transition:var(--transition)}
.navbar.scrolled{background:rgba(15,15,26,0.95);box-shadow:0 10px 30px rgba(0,0,0,0.3)}
.nav-container{max-width:1200px;margin:0 auto;padding:0 20px;display:flex;justify-content:space-between;align-items:center}
.nav-logo{display:flex;align-items:center;gap:10px;font-size:1.5rem;font-weight:800;color:var(--text-primary)}
.logo-icon{color:var(--primary-light);font-size:1.8rem;animation:fi 3s ease-in-out infinite}
@keyframes fi{0%,100%{transform:translateY(0)}50%{transform:translateY(-5px)}}
.logo-text .highlight{color:var(--primary-light)}
.nav-menu{display:flex;list-style:none;gap:5px}
.nav-link{color:var(--text-secondary);text-decoration:none;padding:10px 18px;border-radius:var(--radius-sm);font-weight:500;font-size:.9rem;transition:var(--transition);display:flex;align-items:center;gap:8px}
.nav-link:hover{color:var(--text-primary);background:var(--glass-bg)}
.nav-link.active{color:var(--text-primary);background:linear-gradient(135deg,rgba(108,60,225,0.2),rgba(244,63,94,0.2))}
.nav-right{display:flex;align-items:center;gap:20px}
.access-code-status{display:flex;align-items:center;gap:8px;font-size:.85rem;color:var(--text-secondary)}
.btn-premium{background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;border:none;padding:10px 24px;border-radius:50px;font-weight:600;font-size:.9rem;cursor:pointer;transition:var(--transition);display:flex;align-items:center;gap:8px}
.btn-premium:hover{transform:scale(1.05);box-shadow:var(--shadow-glow)}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer}
.hamburger .bar{width:25px;height:3px;background:var(--text-primary);border-radius:10px;transition:var(--transition)}
.hero-section{padding:140px 20px 80px;max-width:1200px;margin:0 auto;min-height:100vh;display:flex;align-items:center}
.hero-content{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;width:100%}
.hero-left{animation:fadeInUp .8s ease}
.hero-badge{display:inline-block;background:linear-gradient(135deg,rgba(108,60,225,0.2),rgba(244,63,94,0.2));padding:8px 20px;border-radius:50px;font-size:.85rem;font-weight:600;color:var(--primary-light);margin-bottom:20px;border:1px solid rgba(108,60,225,0.2)}
.hero-title{font-size:4rem;font-weight:900;line-height:1.1;margin-bottom:20px}
.gradient-text{background:linear-gradient(135deg,var(--primary),var(--secondary),var(--accent));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.hero-desc{font-size:1.2rem;color:var(--text-secondary);margin-bottom:30px;max-width:500px;line-height:1.8}
.hero-buttons{display:flex;gap:15px;margin-bottom:40px}
.btn-primary{background:linear-gradient(135deg,var(--primary),var(--primary-dark));color:#fff;border:none;padding:14px 32px;border-radius:50px;font-weight:600;font-size:1rem;cursor:pointer;transition:var(--transition);display:flex;align-items:center;gap:10px}
.btn-primary:hover{transform:translateY(-3px);box-shadow:var(--shadow-glow)}
.btn-secondary{background:var(--glass-bg);color:var(--text-primary);border:1px solid var(--glass-border);padding:14px 32px;border-radius:50px;font-weight:600;font-size:1rem;cursor:pointer;transition:var(--transition);display:flex;align-items:center;gap:10px}
.btn-secondary:hover{background:rgba(255,255,255,0.1);transform:translateY(-3px)}
.hero-stats{display:flex;gap:40px}
.stat-item{text-align:center}
.stat-number{display:block;font-size:2rem;font-weight:800;color:var(--text-primary)}
.stat-label{font-size:.85rem;color:var(--text-secondary)}
.hero-right{animation:fadeInUp .8s ease .2s both}
.hero-card{background:var(--dark-card);border-radius:var(--radius);padding:40px;border:1px solid var(--glass-border);box-shadow:var(--shadow);text-align:center}
.card-content .card-icon{font-size:3rem;color:var(--primary-light);margin-bottom:20px}
.card-content h3{font-size:1.3rem;margin-bottom:15px}
.code-display{background:rgba(108,60,225,0.1);padding:15px;border-radius:var(--radius-sm);font-family:'Courier New',monospace;font-size:1.8rem;font-weight:800;color:var(--primary-light);letter-spacing:2px;margin-bottom:15px;border:2px dashed rgba(108,60,225,0.3)}
.btn-outline{background:transparent;color:var(--primary-light);border:2px solid var(--primary);padding:10px 30px;border-radius:50px;font-weight:600;cursor:pointer;transition:var(--transition)}
.btn-outline:hover{background:var(--primary);color:#fff}
.section{padding:80px 20px;max-width:1200px;margin:0 auto}
.section-title{font-size:2.5rem;font-weight:800;margin-bottom:40px;display:flex;align-items:center;gap:15px}
.section-title i{color:var(--primary-light)}
.notice-container{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:25px}
.notice-card{background:var(--dark-card);border-radius:var(--radius);padding:25px;border-left:4px solid var(--primary);transition:var(--transition)}
.notice-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.notice-card .notice-date{font-size:.8rem;color:var(--text-muted);margin-bottom:10px}
.notice-card .notice-title{font-size:1.2rem;font-weight:700;margin-bottom:10px}
.notice-card .notice-desc{color:var(--text-secondary);font-size:.95rem}
.class-container{display:grid;grid-template-columns:1fr 1fr;gap:30px}
.class-card{background:var(--dark-card);border-radius:var(--radius);padding:30px;border:1px solid var(--glass-border);transition:var(--transition)}
.class-card:hover{transform:translateY(-5px);box-shadow:var(--shadow)}
.class-card .class-icon{font-size:2.5rem;color:var(--primary-light);margin-bottom:15px}
.class-card h3{font-size:1.3rem;margin-bottom:10px}
.class-card p{color:var(--text-secondary);margin-bottom:15px}
.class-link{display:inline-flex;align-items:center;gap:8px;color:var(--primary-light);text-decoration:none;font-weight:600;transition:var(--transition)}
.class-link:hover{gap:12px;color:var(--text-primary)}
.syllabus-container{background:var(--dark-card);border-radius:var(--radius);padding:30px;border:1px solid var(--glass-border)}
.syllabus-item{padding:15px 0;border-bottom:1px solid var(--glass-border);display:flex;justify-content:space-between;align-items:center}
.syllabus-item:last-child{border-bottom:none}
.syllabus-item .syllabus-name{font-weight:500}
.syllabus-item .syllabus-status{padding:5px 15px;border-radius:50px;font-size:.8rem;font-weight:600}
.syllabus-status.completed{background:rgba(16,185,129,0.2);color:var(--success)}
.syllabus-status.pending{background:rgba(245,158,11,0.2);color:var(--accent)}
.about-container{display:grid;grid-template-columns:1fr 1fr;gap:40px;align-items:start}
.about-image{background:linear-gradient(135deg,var(--primary),var(--secondary));border-radius:var(--radius);height:400px;display:flex;align-items:center;justify-content:center;font-size:6rem;color:#fff}
.about-content h3{font-size:1.8rem;margin-bottom:15px}
.about-content .teacher-name{color:var(--primary-light)}
.about-content p{color:var(--text-secondary);margin-bottom:15px;line-height:1.8}
.about-details{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin-top:20px}
.detail-item{background:var(--glass-bg);padding:15px;border-radius:var(--radius-sm)}
.detail-item .detail-label{font-size:.8rem;color:var(--text-muted)}
.detail-item .detail-value{font-weight:600;font-size:1.1rem}
.developer-container{background:var(--dark-card);border-radius:var(--radius);padding:40px;border:1px solid var(--glass-border);text-align:center}
.developer-avatar{width:120px;height:120px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));display:flex;align-items:center;justify-content:center;margin:0 auto 20px;font-size:4rem;color:#fff}
.developer-container h3{font-size:1.8rem;margin-bottom:5px}
.developer-container .developer-title{color:var(--primary-light);font-weight:600;margin-bottom:15px}
.developer-container p{color:var(--text-secondary);max-width:500px;margin:0 auto 20px}
.dev-skills{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.dev-skills .skill-tag{background:var(--glass-bg);padding:8px 18px;border-radius:50px;font-size:.85rem;color:var(--text-secondary)}
.locked-message{text-align:center;padding:60px 20px;background:var(--dark-card);border-radius:var(--radius);border:2px dashed rgba(244,63,94,0.3)}
.locked-message i{font-size:4rem;color:var(--secondary);margin-bottom:20px}
.locked-message h3{font-size:1.8rem;margin-bottom:10px}
.locked-message p{color:var(--text-secondary);margin-bottom:20px}
.features-section{background:var(--dark-secondary);padding:80px 20px}
.features-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:25px;max-width:1200px;margin:0 auto}
.feature-card{background:var(--dark-card);border-radius:var(--radius);padding:30px;text-align:center;border:1px solid var(--glass-border);transition:var(--transition);position:relative;overflow:hidden}
.feature-card:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--primary)}
.feature-card .feature-icon{font-size:3rem;color:var(--primary-light);margin-bottom:15px}
.feature-card h3{font-size:1.2rem;margin-bottom:10px}
.feature-card p{color:var(--text-secondary);font-size:.95rem;margin-bottom:15px}
.feature-card .feature-lock{display:inline-block;padding:5px 15px;border-radius:50px;background:rgba(244,63,94,0.2);color:var(--secondary);font-size:.8rem;font-weight:600}
.feature-card.unlocked .feature-lock{background:rgba(16,185,129,0.2);color:var(--success)}
.feature-card.unlocked .feature-lock i{display:none}
.feature-card.unlocked .feature-lock::after{content:' ✅ Unlocked'}
.gallery-container{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:20px}
.gallery-item{background:var(--dark-card);border-radius:var(--radius);padding:20px;text-align:center;border:1px solid var(--glass-border);transition:var(--transition)}
.gallery-item:hover{transform:scale(1.02)}
.gallery-item i{font-size:4rem;color:var(--primary-light);margin-bottom:10px}
.gallery-item .gallery-label{color:var(--text-secondary);font-size:.9rem}
.btn-admin{background:rgba(108,60,225,0.2);color:var(--primary-light);border:1px solid rgba(108,60,225,0.3);padding:8px 18px;border-radius:50px;font-weight:600;font-size:.85rem;cursor:pointer;transition:var(--transition);text-decoration:none;display:inline-flex;align-items:center;gap:8px}
.btn-admin:hover{background:rgba(108,60,225,0.3);transform:scale(1.05)}
.modal{display:none;position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,0.8);backdrop-filter:blur(10px);z-index:9998;justify-content:center;align-items:center}
.modal.show{display:flex;animation:mf .3s ease}
@keyframes mf{from{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}
.premium-modal{background:var(--dark-card);border-radius:var(--radius);padding:40px;max-width:450px;width:90%;border:1px solid var(--glass-border);position:relative}
.close-btn{position:absolute;top:20px;right:25px;font-size:1.8rem;color:var(--text-muted);cursor:pointer;transition:var(--transition)}
.close-btn:hover{color:var(--text-primary);transform:rotate(90deg)}
.modal-header{text-align:center;margin-bottom:30px}
.modal-icon{font-size:3rem;color:var(--primary-light);margin-bottom:15px}
.modal-header h2{font-size:1.8rem;margin-bottom:5px}
.modal-header p{color:var(--text-secondary)}
.modal-body .input-group{position:relative;margin-bottom:20px}
.input-icon{position:absolute;left:15px;top:50%;transform:translateY(-50%);color:var(--text-muted)}
.premium-input{width:100%;padding:15px 15px 15px 45px;background:rgba(255,255,255,0.05);border:2px solid var(--glass-border);border-radius:var(--radius-sm);color:var(--text-primary);font-size:1rem;transition:var(--transition)}
.premium-input:focus{outline:none;border-color:var(--primary)}
.code-hint{background:rgba(108,60,225,0.1);padding:12px 15px;border-radius:var(--radius-sm);margin-bottom:20px}
.code-hint p{color:var(--text-secondary);font-size:.9rem}
.code-hint i{color:var(--primary-light);margin-right:8px}
.btn-premium-full{width:100%;padding:15px;background:linear-gradient(135deg,var(--primary),var(--secondary));border:none;border-radius:var(--radius-sm);color:#fff;font-weight:700;font-size:1rem;cursor:pointer;transition:var(--transition)}
.btn-premium-full:hover{transform:scale(1.02);box-shadow:var(--shadow-glow)}
.footer{background:var(--dark-secondary);border-top:1px solid var(--glass-border);padding:40px 20px}
.footer-content{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:1fr 1fr 1fr;gap:40px;align-items:center}
.footer-left h3{font-size:1.3rem;margin-bottom:5px}
.footer-left p{color:var(--text-secondary)}
.footer-center p{color:var(--text-secondary);margin-bottom:8px}
.footer-center i{color:var(--primary-light);margin-right:10px;width:20px}
.social-links{display:flex;gap:15px;margin-bottom:15px;justify-content:flex-end}
.social-links a{color:var(--text-secondary);font-size:1.5rem;transition:var(--transition)}
.social-links a:hover{color:var(--primary-light);transform:translateY(-3px)}
.copyright{color:var(--text-muted);font-size:.85rem;text-align:right}
@keyframes fadeInUp{from{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}
@media(max-width:1024px){.hero-title{font-size:3rem}.hero-content{grid-template-columns:1fr;gap:40px}.hero-right{order:-1}.about-container{grid-template-columns:1fr}}
@media(max-width:768px){.hamburger{display:flex}.nav-menu{position:fixed;top:70px;left:-100%;width:100%;height:calc(100vh - 70px);background:var(--dark);flex-direction:column;padding:20px;transition:var(--transition);gap:5px;overflow-y:auto}.nav-menu.active{left:0}.nav-link{padding:15px 20px;font-size:1rem}.nav-right .access-code-status{display:none}.hero-title{font-size:2.5rem}.hero-stats{gap:20px}.stat-number{font-size:1.5rem}.class-container{grid-template-columns:1fr}.about-details{grid-template-columns:1fr}.footer-content{grid-template-columns:1fr;text-align:center}.social-links{justify-content:center}.copyright{text-align:center}.section-title{font-size:2rem}.features-grid{grid-template-columns:1fr 1fr}.gallery-container{grid-template-columns:1fr 1fr}}
@media(max-width:480px){.hero-title{font-size:2rem}.hero-buttons{flex-direction:column}.btn-primary,.btn-secondary{justify-content:center}.notice-container{grid-template-columns:1fr}.features-grid{grid-template-columns:1fr}.gallery-container{grid-template-columns:1fr}.btn-admin{display:none}}