/* ===== DESIGN TOKENS ===== */
:root {
    --clr-primary: #25D366;
    --clr-primary-dark: #1DA851;
    --clr-primary-light: #D4F5E0;
    --clr-accent: #075E54;
    --clr-accent-2: #128C7E;
    --clr-bg-dark: #0B1120;
    --clr-bg-card: rgba(255,255,255,0.06);
    --clr-bg-glass: rgba(255,255,255,0.08);
    --clr-text: #E2E8F0;
    --clr-text-muted: #94A3B8;
    --clr-surface: #131B2E;
    --clr-surface-2: #1A2540;
    --clr-border: rgba(255,255,255,0.08);
    --clr-gradient-1: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
    --clr-gradient-2: linear-gradient(135deg, #0B1120 0%, #1A2540 50%, #0B1120 100%);
    --clr-gradient-hero: linear-gradient(160deg, #0B1120 0%, #0F1A2E 40%, #112233 70%, #0B1120 100%);
    --font-primary: 'Inter', 'Noto Sans Bengali', sans-serif;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    --shadow-sm: 0 2px 8px rgba(0,0,0,0.15);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.25);
    --shadow-lg: 0 8px 40px rgba(0,0,0,0.35);
    --shadow-glow: 0 0 30px rgba(37,211,102,0.15);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
    font-family: var(--font-primary);
    background: var(--clr-bg-dark);
    color: var(--clr-text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ===== UTILITIES ===== */
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.section-pad { padding: 100px 0; }
.section-heading {
    text-align: center;
    margin-bottom: 60px;
}
.section-heading h2 {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
    line-height: 1.3;
}
.section-heading p {
    color: var(--clr-text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}
.gradient-text {
    background: var(--clr-gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(30px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}
@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 0 20px rgba(37,211,102,0.2); }
    50% { box-shadow: 0 0 40px rgba(37,211,102,0.4); }
}
@keyframes gradient-shift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}
@keyframes shimmer {
    0% { background-position: -200% center; }
    100% { background-position: 200% center; }
}
.animate-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.animate-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: transparent;
}
.navbar.scrolled {
    background: rgba(11,17,32,0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--clr-border);
    padding: 10px 0;
}
.navbar .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.navbar-brand {
    font-size: 1.6rem;
    font-weight: 800;
    display: flex;
    align-items: center;
    gap: 8px;
}
.navbar-brand .logo-icon {
    width: 36px;
    height: 36px;
    background: var(--clr-gradient-1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}
.navbar-links { display: flex; align-items: center; gap: 8px; }
.navbar-links a {
    padding: 8px 18px;
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
    color: var(--clr-text-muted);
}
.navbar-links a:hover { color: #fff; }
.navbar-links .btn-nav {
    background: var(--clr-gradient-1);
    color: #fff;
    font-weight: 600;
    padding: 10px 24px;
}
.navbar-links .btn-nav:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

/* Mobile hamburger */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
    background: none;
    border: none;
}
.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: #fff;
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== HERO ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: var(--clr-gradient-hero);
    overflow: hidden;
    padding-top: 80px;
}
.hero::before {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37,211,102,0.12) 0%, transparent 70%);
    top: -100px;
    right: -100px;
    border-radius: 50%;
    pointer-events: none;
}
.hero::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(18,140,126,0.1) 0%, transparent 70%);
    bottom: -50px;
    left: -50px;
    border-radius: 50%;
    pointer-events: none;
}
.hero .container {
    text-align: center;
    position: relative;
    z-index: 2;
}
.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: rgba(37,211,102,0.1);
    border: 1px solid rgba(37,211,102,0.2);
    color: var(--clr-primary);
    padding: 8px 20px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 32px;
    animation: fadeInUp 0.6s ease;
}
.hero h1 {
    font-size: clamp(2.2rem, 6vw, 3.8rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    color: #fff;
    animation: fadeInUp 0.6s ease 0.15s both;
}
.hero .subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--clr-text-muted);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.8;
    animation: fadeInUp 0.6s ease 0.3s both;
}
.hero-cta {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    animation: fadeInUp 0.6s ease 0.45s both;
}
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--clr-gradient-1);
    color: #fff;
    padding: 16px 36px;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 700;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
}
.btn-primary::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    background-size: 200% 100%;
    animation: shimmer 3s infinite;
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(37,211,102,0.35);
}
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--clr-bg-glass);
    color: #fff;
    padding: 16px 36px;
    border-radius: var(--radius-lg);
    font-size: 1.1rem;
    font-weight: 600;
    border: 1px solid var(--clr-border);
    transition: var(--transition);
    cursor: pointer;
    backdrop-filter: blur(10px);
}
.btn-secondary:hover {
    background: rgba(255,255,255,0.12);
    border-color: rgba(255,255,255,0.2);
    transform: translateY(-3px);
}

/* ===== STATS BAR ===== */
.stats-bar {
    background: var(--clr-surface);
    border-top: 1px solid var(--clr-border);
    border-bottom: 1px solid var(--clr-border);
    padding: 32px 0;
}
.stats-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 40px;
}
.stat-item {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1rem;
    font-weight: 500;
    color: var(--clr-text-muted);
}
.stat-item .check {
    color: var(--clr-primary);
    font-weight: 700;
    font-size: 1.1rem;
}

/* ===== HOW IT WORKS ===== */
.how-it-works { background: var(--clr-bg-dark); }
.steps-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
    position: relative;
}
.steps-grid::before {
    content: '';
    position: absolute;
    top: 50px;
    left: 15%;
    right: 15%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--clr-primary), var(--clr-primary), transparent);
    opacity: 0.2;
    z-index: 0;
}
.step-card {
    text-align: center;
    padding: 40px 28px;
    background: var(--clr-bg-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-xl);
    position: relative;
    z-index: 1;
    transition: var(--transition);
}
.step-card:hover {
    transform: translateY(-6px);
    border-color: rgba(37,211,102,0.3);
    box-shadow: 0 12px 40px rgba(37,211,102,0.08);
}
.step-number {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    background: var(--clr-gradient-1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    color: #fff;
    box-shadow: 0 4px 20px rgba(37,211,102,0.3);
}
.step-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 12px;
}
.step-card p {
    color: var(--clr-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* ===== FEATURES ===== */
.features { background: var(--clr-surface); }
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}
.feature-card {
    padding: 36px 28px;
    background: var(--clr-bg-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-xl);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--clr-gradient-1);
    opacity: 0;
    transition: var(--transition);
}
.feature-card:hover {
    transform: translateY(-6px);
    border-color: rgba(37,211,102,0.25);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.feature-card:hover::before { opacity: 1; }
.feature-icon {
    width: 52px;
    height: 52px;
    background: rgba(37,211,102,0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}
.feature-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 10px;
}
.feature-card p {
    color: var(--clr-text-muted);
    font-size: 0.93rem;
    line-height: 1.7;
}

/* ===== PRICING ===== */
.pricing { background: var(--clr-bg-dark); }
.pricing-card {
    max-width: 440px;
    margin: 0 auto;
    padding: 48px 40px;
    background: var(--clr-bg-card);
    border: 1px solid rgba(37,211,102,0.3);
    border-radius: var(--radius-xl);
    text-align: center;
    position: relative;
    overflow: hidden;
    animation: pulse-glow 4s ease infinite;
}
.pricing-badge {
    display: inline-block;
    background: var(--clr-gradient-1);
    color: #fff;
    padding: 6px 20px;
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 700;
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.pricing-card h3 {
    font-size: 2rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 8px;
}
.pricing-card .price-label {
    color: var(--clr-primary);
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 28px;
}
.pricing-features {
    text-align: left;
    margin-bottom: 32px;
}
.pricing-features li {
    padding: 10px 0;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--clr-text);
    font-size: 1rem;
    border-bottom: 1px solid var(--clr-border);
}
.pricing-features li:last-child { border-bottom: none; }
.pricing-features li .pf-check {
    color: var(--clr-primary);
    font-weight: 700;
    font-size: 1.1rem;
    flex-shrink: 0;
}

/* ===== USE CASES ===== */
.use-cases { background: var(--clr-surface); }
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.use-case-card {
    display: flex;
    gap: 20px;
    padding: 32px 28px;
    background: var(--clr-bg-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-xl);
    transition: var(--transition);
}
.use-case-card:hover {
    transform: translateY(-4px);
    border-color: rgba(37,211,102,0.2);
}
.use-case-icon {
    width: 56px;
    height: 56px;
    flex-shrink: 0;
    background: rgba(37,211,102,0.1);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.6rem;
}
.use-case-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}
.use-case-card p {
    color: var(--clr-text-muted);
    font-size: 0.93rem;
    line-height: 1.7;
}

/* ===== BENEFITS ===== */
.benefits { background: var(--clr-bg-dark); }
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    max-width: 800px;
    margin: 0 auto;
}
.benefit-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 18px 24px;
    background: var(--clr-bg-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    transition: var(--transition);
    font-size: 0.95rem;
    color: var(--clr-text);
}
.benefit-item:hover {
    border-color: rgba(37,211,102,0.2);
    background: rgba(37,211,102,0.05);
}
.benefit-item .bi-check {
    color: var(--clr-primary);
    font-size: 1.2rem;
    flex-shrink: 0;
}

/* ===== FAQ ===== */
.faq { background: var(--clr-surface); }
.faq-list {
    max-width: 760px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.faq-item {
    background: var(--clr-bg-card);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}
.faq-item.active { border-color: rgba(37,211,102,0.3); }
.faq-question {
    padding: 20px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    font-weight: 600;
    color: #fff;
    font-size: 1rem;
    background: none;
    border: none;
    width: 100%;
    text-align: left;
    font-family: inherit;
    transition: var(--transition);
}
.faq-question:hover { color: var(--clr-primary); }
.faq-chevron {
    transition: var(--transition);
    font-size: 0.9rem;
    color: var(--clr-text-muted);
}
.faq-item.active .faq-chevron { transform: rotate(180deg); color: var(--clr-primary); }
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.35s ease, padding 0.35s ease;
}
.faq-item.active .faq-answer { max-height: 200px; }
.faq-answer-inner {
    padding: 0 24px 20px;
    color: var(--clr-text-muted);
    font-size: 0.95rem;
    line-height: 1.8;
}

/* ===== FINAL CTA ===== */
.final-cta {
    background: var(--clr-bg-dark);
    position: relative;
    overflow: hidden;
    text-align: center;
}
.final-cta::before {
    content: '';
    position: absolute;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(37,211,102,0.08) 0%, transparent 70%);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
}
.final-cta .container { position: relative; z-index: 2; }
.final-cta h2 {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    color: #fff;
    margin-bottom: 16px;
}
.final-cta .sub-text {
    color: var(--clr-text-muted);
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 36px;
    line-height: 1.8;
}
.trust-badges {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 24px;
    margin-top: 32px;
}
.trust-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--clr-text-muted);
    font-size: 0.9rem;
}
.trust-badge .tb-check { color: var(--clr-primary); }

/* ===== FOOTER ===== */
.site-footer {
    background: var(--clr-surface);
    border-top: 1px solid var(--clr-border);
    padding: 60px 0 32px;
}
.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 40px;
}
.footer-brand h3 {
    font-size: 1.4rem;
    font-weight: 800;
    color: #fff;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.footer-brand p { color: var(--clr-text-muted); font-size: 0.95rem; }
.footer-col h4 {
    color: #fff;
    font-weight: 700;
    margin-bottom: 16px;
    font-size: 1rem;
}
.footer-col a {
    display: block;
    color: var(--clr-text-muted);
    padding: 6px 0;
    font-size: 0.93rem;
    transition: var(--transition);
}
.footer-col a:hover { color: var(--clr-primary); transform: translateX(4px); }
.footer-bottom {
    border-top: 1px solid var(--clr-border);
    padding-top: 24px;
    text-align: center;
    color: var(--clr-text-muted);
    font-size: 0.85rem;
}

/* ===== RESPONSIVE ===== */
@media (max-width: 992px) {
    .steps-grid { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; }
    .steps-grid::before { display: none; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 768px) {
    .section-pad { padding: 72px 0; }
    .navbar-links { 
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(11,17,32,0.97);
        backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px 24px;
        border-bottom: 1px solid var(--clr-border);
    }
    .navbar-links.open { display: flex; }
    .mobile-toggle { display: flex; }
    .features-grid { grid-template-columns: 1fr; }
    .use-cases-grid { grid-template-columns: 1fr; }
    .benefits-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; gap: 32px; }
    .hero h1 { font-size: clamp(1.8rem, 7vw, 2.8rem); }
    .btn-primary, .btn-secondary { padding: 14px 28px; font-size: 1rem; }
    .hero-cta { flex-direction: column; align-items: center; }
    .stats-grid { gap: 20px; }
}