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

:root{
  --navy:#1e3a8a;--navy-dark:#0f2158;--navy-soft:#eef2fc;
  --orange:#f59e0b;--orange-dark:#d97706;
  --ink:#0f172a;--muted:#5b6478;--line:#e1e7f3;--soft:#f6f8fd;--white:#fff;
  --success:#15803d;--danger:#b91c1c;
  --radius:18px;--radius-lg:26px;
  --shadow:0 18px 46px rgba(15,33,88,.14);
  --shadow-sm:0 8px 24px rgba(15,33,88,.08);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;font-family:"Hind Siliguri",system-ui,"Segoe UI",sans-serif;
  color:var(--ink);background:var(--white);line-height:1.7;font-size:16px;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button,input,textarea,select{font:inherit}
ul{margin:0}
.container{width:min(1180px,calc(100% - 2.5rem));margin:0 auto}
.section{padding:5rem 0}
.section-soft{background:var(--soft)}
.eyebrow{display:inline-flex;align-items:center;gap:.5rem;color:var(--orange-dark);font-weight:800;font-size:.85rem;letter-spacing:.02em}
.eyebrow::before{content:"";width:26px;height:3px;border-radius:99px;background:var(--orange)}
.section-title{font-size:clamp(1.9rem,3.6vw,2.9rem);line-height:1.25;margin:.6rem 0 1rem;font-weight:800;color:var(--navy-dark)}
.section-intro{color:var(--muted);max-width:680px;margin:0 0 2.4rem;font-size:1.05rem}

/* Header */
.site-header{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.85);backdrop-filter:blur(18px) saturate(1.4);-webkit-backdrop-filter:blur(18px) saturate(1.4);border-bottom:1px solid rgba(30,58,138,.08);transition:box-shadow .3s ease,background-color .3s ease}
.site-header::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--navy) 0%,var(--orange) 50%,var(--navy) 100%);opacity:.9}
.site-header.is-scrolled{background:rgba(255,255,255,.96);box-shadow:0 10px 30px rgba(15,33,88,.1)}
.nav{height:84px;display:flex;align-items:center;justify-content:space-between;gap:1.5rem;position:relative}
.brand{display:flex;align-items:center;gap:.75rem}
.brand img{width:46px;height:46px;object-fit:contain;filter:drop-shadow(0 4px 10px rgba(30,58,138,.22));transition:transform .3s ease}
.brand:hover img{transform:scale(1.05) rotate(-2deg)}
.brand-text{line-height:1.1;font-weight:800;color:var(--navy-dark);font-size:1.08rem;letter-spacing:-.01em}
.brand-text small{display:block;font-weight:700;font-size:.64rem;letter-spacing:.24em;color:var(--orange-dark);margin-top:.15rem}
.nav-links{display:flex;align-items:center;gap:.3rem}
.nav-links a{position:relative;font-weight:700;font-size:.94rem;color:#3b4358;padding:.6rem .9rem;border-radius:10px;transition:color .25s ease,background-color .25s ease;letter-spacing:.01em}
.nav-links a::after{content:"";position:absolute;left:.9rem;right:.9rem;bottom:.32rem;height:2px;border-radius:99px;background:var(--orange);transform:scaleX(0);transform-origin:right;transition:transform .3s cubic-bezier(.4,0,.2,1)}
.nav-links a:hover{color:var(--navy-dark);background:rgba(30,58,138,.06)}
.nav-links a:hover::after,.nav-links a.active::after{transform:scaleX(1);transform-origin:left}
.nav-links a.active{color:var(--navy-dark)}
.nav-actions{display:flex;align-items:center;gap:.7rem}
.menu-toggle{display:none;background:none;border:1px solid var(--line);border-radius:10px;padding:.45rem .6rem;color:var(--navy);font-size:1.5rem;cursor:pointer;line-height:1;transition:.2s ease}
.menu-toggle:hover{background:var(--navy-soft);border-color:var(--navy)}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;border:0;border-radius:999px;padding:.85rem 1.3rem;font-weight:800;font-size:.96rem;cursor:pointer;transition:transform .25s cubic-bezier(.34,1.56,.64,1),box-shadow .25s ease,background .25s ease;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,#ffc247 0%,var(--orange) 55%,var(--orange-dark) 100%);color:#1c2434;box-shadow:0 10px 22px rgba(217,119,6,.32),inset 0 1px 0 rgba(255,255,255,.55)}
.btn-primary:hover{transform:translateY(-2px) scale(1.02);box-shadow:0 16px 30px rgba(217,119,6,.4),inset 0 1px 0 rgba(255,255,255,.55)}
.btn-primary:active{transform:translateY(0) scale(.99)}
.nav-actions .btn-primary{padding:.8rem 1.4rem .8rem 1.5rem}
.nav-actions .btn-primary::after{content:"→";font-weight:700;transition:transform .25s ease}
.nav-actions .btn-primary:hover::after{transform:translateX(3px)}
.btn-secondary{background:var(--navy);color:#fff}
.btn-secondary:hover{background:var(--navy-dark)}
.btn-outline{border:1.5px solid var(--line);background:#fff;color:var(--navy)}
.btn-outline:hover{border-color:var(--navy)}
.btn-block{width:100%}

/* Hero slider */
.hero-slider{position:relative;overflow:hidden;background:var(--navy-dark);isolation:isolate}
.hero-slides{position:relative;aspect-ratio:1942/809;width:100%}
.hero-slide{position:absolute;inset:0;opacity:0;visibility:hidden;transform:scale(1.04);transition:opacity .9s ease,visibility .9s,transform 6s ease;z-index:0}
.hero-slide.active{opacity:1;visibility:visible;transform:scale(1);z-index:1}
.hero-slide img{width:100%;height:100%;object-fit:cover}
.slider-arrow{position:absolute;top:50%;z-index:3;transform:translateY(-50%);width:46px;height:46px;border:1px solid rgba(255,255,255,.6);border-radius:50%;background:rgba(15,33,88,.55);backdrop-filter:blur(8px);color:#fff;font-size:1.9rem;line-height:1;cursor:pointer}
.slider-arrow:hover{background:var(--orange);color:var(--navy-dark);border-color:var(--orange)}
.slider-prev{left:20px}.slider-next{right:20px}
.slider-dots{position:absolute;z-index:3;left:50%;bottom:20px;transform:translateX(-50%);display:flex;gap:8px;padding:8px 12px;border-radius:99px;background:rgba(9,20,55,.55);backdrop-filter:blur(8px)}
.slider-dots button{width:9px;height:9px;padding:0;border:0;border-radius:99px;background:rgba(255,255,255,.55);cursor:pointer;transition:.25s ease}
.slider-dots button.active{width:26px;background:var(--orange)}
.slider-progress{position:absolute;z-index:3;left:0;right:0;bottom:0;height:4px;background:rgba(255,255,255,.2)}
.slider-progress span{display:block;width:0;height:100%;background:var(--orange)}
.slider-progress span.running{animation:slideTimer var(--slide-duration,5s) linear forwards}
@keyframes slideTimer{to{width:100%}}
@media(prefers-reduced-motion:reduce){.hero-slide{transition:none;transform:none}.slider-progress{display:none}}

/* Trust bar */
.trust{background:#fff;border-bottom:1px solid var(--line)}
.trust-grid{display:grid;grid-template-columns:repeat(4,1fr);padding:1.5rem 0}
.trust-item{text-align:center;border-right:1px solid var(--line)}
.trust-item:last-child{border:0}
.trust-item strong{display:block;color:var(--navy);font-size:1.3rem;font-weight:800}
.trust-item span{font-size:.88rem;color:var(--muted)}

/* Cards & grids */
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1.5rem}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:1.5rem;box-shadow:var(--shadow-sm)}

/* Course cards */
.course-card{display:flex;flex-direction:column}
.course-banner{position:relative;aspect-ratio:16/9;margin:0 0 1rem;border-radius:14px;overflow:hidden;background:var(--navy-dark);box-shadow:0 10px 22px rgba(15,23,42,.18)}
.course-banner img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease}
.course-card:hover .course-banner img{transform:scale(1.04)}
.course-banner .mode-tag{position:absolute;top:.7rem;right:.7rem;background:rgba(15,33,88,.72);color:#fff;font-size:.72rem;font-weight:700;padding:.3rem .65rem;border-radius:999px;backdrop-filter:blur(4px)}
.course-card h3{font-size:1.2rem;margin:0 0 .4rem;font-weight:800;color:var(--navy-dark)}
.course-meta{display:flex;flex-wrap:wrap;gap:.6rem;margin-bottom:.7rem}
.badge{display:inline-flex;align-items:center;border-radius:999px;padding:.28rem .75rem;font-size:.76rem;font-weight:800;background:#fff3d6;color:#8a4b00}
.badge-free{background:#dcfce7;color:var(--success)}
.course-price{display:flex;align-items:baseline;gap:.55rem;margin:.1rem 0 1rem}
.price-now{font-size:1.4rem;font-weight:800;color:var(--navy)}
.price-old{color:var(--muted);text-decoration:line-through;font-size:.9rem}
.price-free{font-size:1.15rem;font-weight:800;color:var(--success);margin:.1rem 0 1rem}
.price-tbd{font-size:.98rem;font-weight:700;color:var(--muted);margin:.1rem 0 1rem}
.course-card .btn{margin-top:auto}

/* Feature blocks */
.feature{padding:1.8rem}
.feature-icon{width:46px;height:46px;border-radius:13px;display:grid;place-items:center;background:#fff3d6;color:#9a5700;font-weight:800;font-size:1.15rem}
.feature h3{margin:1rem 0 .4rem;font-weight:800}

/* Split / instructor */
.split{display:grid;grid-template-columns:1fr 1fr;gap:3.5rem;align-items:center}
.portrait{background:linear-gradient(150deg,var(--navy),#3157bd);border-radius:var(--radius-lg);min-height:400px;color:#fff;padding:2.2rem;display:flex;align-items:flex-end;position:relative;overflow:hidden}
.portrait::before{content:"Aa";position:absolute;font-size:11rem;font-weight:800;opacity:.1;right:1rem;top:-1.5rem}
.list-check{padding:0;list-style:none}
.list-check li{padding:.4rem 0}
.list-check li::before{content:"✓";color:var(--success);font-weight:800;margin-right:.55rem}

/* Testimonials */
.stars{color:var(--orange);letter-spacing:.15em;margin-bottom:.5rem}
.quote{font-size:1.02rem;color:#334155;margin:0 0 .8rem}

/* CTA banner */
.cta-banner{background:linear-gradient(120deg,var(--navy-dark),var(--navy));color:#fff;border-radius:var(--radius-lg);padding:2.8rem;display:flex;align-items:center;justify-content:space-between;gap:2rem;box-shadow:var(--shadow)}
.cta-banner h2{font-size:clamp(1.7rem,3.4vw,2.5rem);margin:0;font-weight:800}

/* Page hero (inner pages) */
.page-hero{padding:4rem 0;background:linear-gradient(130deg,var(--navy-dark),var(--navy));color:#fff}
.page-hero h1{font-size:clamp(2rem,4.4vw,3.2rem);margin:.5rem 0;font-weight:800;line-height:1.2}
.page-hero p{max-width:640px;color:#dbe4ff}
.course-tag{display:inline-flex;background:rgba(255,255,255,.16);border-radius:999px;padding:.35rem .8rem;font-size:.82rem;font-weight:700}

/* Filters / tabs */
.filters,.auth-tabs{display:flex;gap:.6rem;flex-wrap:wrap;margin-bottom:2rem}
.filter-btn,.tab-btn{border:1.5px solid var(--line);background:#fff;color:#475569;border-radius:999px;padding:.65rem 1.1rem;font-weight:700;cursor:pointer}
.filter-btn.active,.tab-btn.active{background:var(--navy);color:#fff;border-color:var(--navy)}
.course-card[hidden]{display:none}

/* Course detail */
.detail-layout{display:grid;grid-template-columns:minmax(0,1fr) 360px;gap:2.5rem}
.enroll-box{position:sticky;top:96px}
.price-big{font-size:2.3rem;font-weight:800;color:var(--navy);margin:.3rem 0}
.accordion{border:1px solid var(--line);border-radius:14px;overflow:hidden;margin:.75rem 0}
.accordion-button{width:100%;border:0;background:#fff;text-align:right;padding:1rem;display:flex;justify-content:space-between;font-weight:800;color:var(--ink);cursor:pointer}
.accordion-panel{display:none;padding:0 1rem 1rem;color:var(--muted)}
.accordion.open .accordion-panel{display:block}

/* Bio cards */
.bio-card{text-align:center}
.avatar{width:84px;height:84px;margin:0 auto 1rem;border-radius:50%;display:grid;place-items:center;background:var(--navy);color:#fff;font-size:1.5rem;font-weight:800;border:5px solid var(--navy-soft)}

/* Contact */
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:2.5rem}
.contact-list{display:grid;gap:1rem}
.contact-item{padding:1rem 1.2rem;background:#fff;border:1px solid var(--line);border-radius:14px}
.form{display:grid;gap:1rem}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.field label{display:block;font-weight:700;margin-bottom:.4rem;font-size:.95rem}
.field input,.field textarea,.field select{width:100%;border:1.5px solid #cdd6ea;border-radius:12px;padding:.85rem 1rem;background:#fff;outline:none}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--navy);box-shadow:0 0 0 3px rgba(30,58,138,.12)}
.error{color:var(--danger);font-size:.82rem;min-height:1.2em}
.success-msg{display:none;background:#dcfce7;color:#166534;padding:.9rem 1rem;border-radius:12px;font-weight:700}
.success-msg.show{display:block}

/* Auth pages */
.auth-page{min-height:calc(100vh - 76px);display:grid;place-items:center;padding:3rem 1rem;background:linear-gradient(135deg,var(--navy-soft),#fff8e9)}
.auth-card{width:min(480px,100%);background:#fff;border-radius:22px;padding:2.2rem;box-shadow:var(--shadow)}
.auth-panel{display:none}
.auth-panel.active{display:block}

/* Dashboard */
.dashboard-body{background:#f3f6fb}
.dashboard{display:grid;grid-template-columns:250px 1fr;min-height:100vh}
.sidebar{background:var(--navy-dark);color:#fff;padding:1.5rem;position:sticky;top:0;height:100vh}
.sidebar .brand-text{color:#fff}
.sidebar .brand-text small{color:#93a5e6}
.side-nav{display:grid;gap:.4rem;margin-top:2rem}
.side-nav a{padding:.8rem 1rem;border-radius:12px;color:#c7d3f5;font-weight:700}
.side-nav a:hover,.side-nav a.active{background:rgba(255,255,255,.12);color:#fff}
.dash-main{padding:2rem}
.dash-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:2rem;flex-wrap:wrap}
.dash-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:1.2rem}
.progress{height:9px;border-radius:99px;background:var(--line);overflow:hidden;margin:.7rem 0}
.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--orange),#fbbf24);border-radius:99px}
.player{margin-top:2rem;display:grid;grid-template-columns:1.4fr .6fr;gap:1.2rem}
.video-placeholder{min-height:320px;background:var(--navy-dark);color:#fff;border-radius:18px;display:grid;place-items:center;text-align:center}
.module-list{display:grid;gap:.6rem}
.check-item{display:flex;align-items:flex-start;gap:.6rem;padding:.75rem;border:1px solid var(--line);border-radius:12px}

/* Footer */
.site-footer{background:var(--navy-dark);color:#c7d3f5;padding:3.6rem 0 1.4rem}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:2rem}
.site-footer h3{color:#fff;font-weight:800;margin:0 0 .8rem}
.footer-links{display:grid;gap:.5rem}
.footer-links a:hover{color:#fbbf24}
.payments{display:flex;gap:.5rem;flex-wrap:wrap}
.payment{padding:.4rem .75rem;border-radius:8px;background:#fff;color:var(--navy);font-weight:800;font-size:.88rem}
.footer-bottom{border-top:1px solid rgba(255,255,255,.14);margin-top:2.2rem;padding-top:1.3rem;color:#8fa0d6;font-size:.88rem}
.muted{color:var(--muted)}

@media(max-width:960px){
  .menu-toggle{display:block}
  .nav-links{display:none;position:absolute;top:76px;left:0;right:0;background:#fff;padding:1rem;box-shadow:var(--shadow);flex-direction:column;align-items:stretch;gap:.3rem}
  .nav-links.open{display:flex}
  .nav-links a{padding:.65rem .2rem}
  .nav-actions .btn-primary{display:none}
  .split,.detail-layout,.contact-grid{grid-template-columns:1fr}
  .grid-3,.grid-2{grid-template-columns:repeat(2,1fr)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .enroll-box{position:static}
  .dashboard{grid-template-columns:1fr}
  .sidebar{position:static;height:auto}
  .side-nav{grid-template-columns:repeat(4,1fr);overflow:auto}
  .player{grid-template-columns:1fr}
}
@media(max-width:640px){
  .section{padding:3.4rem 0}
  .grid-3,.grid-2,.dash-grid,.form-row{grid-template-columns:1fr}
  .trust-grid{grid-template-columns:repeat(2,1fr);gap:1rem}
  .trust-item:nth-child(2){border:0}
  .cta-banner{flex-direction:column;align-items:flex-start;padding:2rem}
  .footer-grid{grid-template-columns:1fr}
  .side-nav{grid-template-columns:1fr 1fr}
  .dash-main{padding:1.2rem}
  .dash-head{flex-direction:column;align-items:flex-start}
  .slider-arrow{width:36px;height:36px;font-size:1.4rem}
  .slider-prev{left:8px}.slider-next{right:8px}
  .slider-dots{bottom:10px;padding:6px 10px}
}