:root {
    --bg-dark: #050810;
    --bg-card: #0f172a;
    --cyan: #00F5FF;
    --purple: #7000FF;
    --text: #f8fafc;
    --gray: #94a3b8;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Hind Siliguri', sans-serif; scroll-behavior: smooth; }

body { background-color: var(--bg-dark); color: var(--text); overflow-x: hidden; }
.container { max-width: 1240px; margin: 0 auto; padding: 0 20px; width: 100%; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

/* Top Bar */
.top-bar { background: #000; padding: 10px 0; font-size: 14px; border-bottom: 1px solid rgba(255,255,255,0.05); }
.portal a { color: var(--cyan); text-decoration: none; font-weight: 600; }

/* Header & Nav Fix */
header { background: rgba(5, 8, 16, 0.9); backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 1000; border-bottom: 1px solid rgba(255,255,255,0.05); }
.nav-wrapper { display: flex; justify-content: space-between; align-items: center; height: 80px; }
.logo { font-size: 22px; font-weight: 800; white-space: nowrap; flex-shrink: 0; }
.cyan-text { color: var(--cyan); }

.nav-links { display: flex; align-items: center; list-style: none; gap: 30px; }
.nav-links a { text-decoration: none; color: #fff; font-weight: 500; transition: 0.3s; }
.nav-links a:hover { color: var(--cyan); }

.nav-btns { display: flex; gap: 12px; align-items: center; margin-left: 20px; }
.btn-connection { background: var(--cyan); color: #000 !important; padding: 8px 18px; border-radius: 6px; font-weight: 700; }
.btn-billing { border: 1px solid rgba(255,255,255,0.2); padding: 8px 18px; border-radius: 6px; transition: 0.3s; }
.btn-billing:hover { background: #fff; color: #000 !important; }

/* Hero Section */
.hero { padding: 80px 0; background: radial-gradient(circle at top right, rgba(0, 245, 255, 0.05), transparent); }
.hero-grid { display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; align-items: center; }
.badge { display: inline-block; padding: 5px 15px; border: 1px solid var(--cyan); color: var(--cyan); border-radius: 50px; margin-bottom: 20px; font-size: 14px; }
.hero h1 { font-size: 56px; line-height: 1.1; margin-bottom: 20px; }
.gradient-text { background: linear-gradient(90deg, var(--cyan), var(--purple)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 18px; color: var(--gray); margin-bottom: 35px; }
.hero-action-btns { display: flex; gap: 15px; }
.btn-main { background: var(--cyan); color: #000; text-decoration: none; padding: 14px 30px; border-radius: 8px; font-weight: bold; box-shadow: 0 0 20px rgba(0, 245, 255, 0.3); }
.btn-outline { border: 1px solid #fff; color: #fff; text-decoration: none; padding: 14px 30px; border-radius: 8px; }

/* Hero Visual */
.hero-visual { display: flex; justify-content: center; }
.speed-card { background: var(--bg-card); padding: 40px; border-radius: 30px; border: 1px solid rgba(255,255,255,0.1); text-align: center; box-shadow: 0 20px 40px rgba(0,0,0,0.4); animation: float 4s ease-in-out infinite; }
.speed-num { display: block; font-size: 60px; font-weight: 800; color: var(--cyan); }
.speed-unit { font-size: 20px; color: var(--gray); }

/* Packages */
.packages { padding: 100px 0; background: #02040a; }
.section-title { text-align: center; margin-bottom: 60px; font-size: 36px; }
.package-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }
.card { background: var(--bg-card); padding: 40px; border-radius: 20px; border: 1px solid rgba(255,255,255,0.05); text-align: center; position: relative; transition: 0.3s; }
.card:hover { border-color: var(--cyan); transform: translateY(-10px); }
.card.popular { border: 2px solid var(--purple); }
.popular-tag { position: absolute; top: -15px; left: 50%; transform: translateX(-50%); background: var(--purple); padding: 4px 15px; border-radius: 20px; font-size: 12px; }
.price { font-size: 36px; font-weight: 800; margin: 20px 0; color: var(--cyan); }
.price span { font-size: 16px; color: var(--gray); }
.card ul { list-style: none; text-align: left; margin-bottom: 30px; }
.card ul li { margin-bottom: 12px; color: var(--gray); }
.card ul i { color: var(--cyan); margin-right: 10px; }
.card-btn { width: 100%; padding: 12px; border-radius: 8px; border: 1px solid rgba(255,255,255,0.1); background: transparent; color: #fff; cursor: pointer; }
.card-btn.featured { background: var(--cyan); color: #000; font-weight: bold; border: none; }

/* About Section */
.about { padding: 100px 0; }
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-img .img-box { height: 350px; background: linear-gradient(45deg, var(--bg-card), var(--purple)); border-radius: 20px; display: flex; align-items: center; justify-content: center; font-size: 24px; font-weight: bold; opacity: 0.6; }

.menu-toggle { display: none; font-size: 24px; cursor: pointer; }

footer { padding: 40px; text-align: center; border-top: 1px solid rgba(255,255,255,0.05); color: var(--gray); }

/* Animations */
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }

/* RESPONSIVE DESIGN */
@media (max-width: 1024px) {
    .nav-links { display: none; } /* মোবাইলে সাধারণ মেনু হাইড */
    .menu-toggle { display: block; }
    .hero-grid { grid-template-columns: 1fr; text-align: center; }
    .hero-action-btns { justify-content: center; }
    .hero h1 { font-size: 42px; }
    .about-grid { grid-template-columns: 1fr; text-align: center; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 32px; }
    .logo { font-size: 18px; }
    .top-bar .flex-between { flex-direction: column; gap: 5px; }
}