* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    background: #f5f7ff;
    color: #111827;
}

/* Header */
.header {
    width: 100%;
    padding: 18px 8%;
    background: #0f172a;
    color: white;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: bold;
}

.logo img {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    object-fit: cover;
}

.nav-btn {
    text-decoration: none;
    background: #2563eb;
    color: white;
    padding: 10px 16px;
    border-radius: 10px;
    font-weight: bold;
}

/* Hero */
.hero {
    min-height: 90vh;
    background: linear-gradient(135deg, #0f172a, #1e3a8a, #2563eb);
    color: white;
    display: flex;
    align-items: center;
    padding: 70px 8%;
}

.hero-content {
    max-width: 650px;
}

.hero h1 {
    font-size: 52px;
    line-height: 1.15;
    margin-bottom: 20px;
}

.hero p {
    font-size: 18px;
    line-height: 1.7;
    margin-bottom: 30px;
    color: #dbeafe;
}

.main-btn {
    display: inline-block;
    text-decoration: none;
    background: #22c55e;
    color: white;
    padding: 14px 24px;
    border-radius: 14px;
    font-weight: bold;
    box-shadow: 0 10px 25px rgba(34, 197, 94, 0.35);
}

/* Common Section */
.section {
    padding: 70px 8%;
}

.section h2 {
    text-align: center;
    font-size: 34px;
    margin-bottom: 35px;
    color: #0f172a;
}

.cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}

.card {
    background: white;
    padding: 25px;
    border-radius: 20px;
    box-shadow: 0 12px 35px rgba(15, 23, 42, 0.08);
}

.card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: #1d4ed8;
}

.card p {
    color: #475569;
    line-height: 1.6;
}

/* Steps */
.dark-section {
    background: #0f172a;
}

.dark-section h2 {
    color: white;
}

.steps {
    max-width: 800px;
    margin: auto;
}

.step {
    background: #1e293b;
    color: white;
    padding: 18px 22px;
    border-radius: 14px;
    margin-bottom: 14px;
    font-size: 18px;
}

/* Screenshots */
.center-text {
    text-align: center;
    color: #475569;
    margin-bottom: 18px;
}

.screenshot-box {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
    margin-top: 25px;
}

.screenshot-box img {
    width: 100%;
    max-width: 260px;
    height: 520px;
    object-fit: cover;
    border-radius: 26px;
    box-shadow: 0 18px 45px rgba(15, 23, 42, 0.18);
    background: #e2e8f0;
    margin: auto;
}

/* Download */
.download {
    text-align: center;
    background: linear-gradient(135deg, #dbeafe, #eff6ff);
}

.download p {
    margin-bottom: 25px;
    color: #475569;
}

/* Footer */
.footer {
    background: #020617;
    color: white;
    padding: 25px 8%;
    text-align: center;
}

.footer p {
    margin-bottom: 12px;
}

.footer a {
    color: #93c5fd;
    text-decoration: none;
    margin: 0 10px;
}

/* Mobile Responsive */
@media (max-width: 900px) {
    .cards {
        grid-template-columns: repeat(2, 1fr);
    }

    .screenshot-box {
        grid-template-columns: 1fr;
    }

    .hero h1 {
        font-size: 38px;
    }
}

@media (max-width: 600px) {
    .header {
        padding: 16px 5%;
    }

    .logo {
        font-size: 18px;
    }

    .nav-btn {
        padding: 9px 12px;
        font-size: 13px;
    }

    .hero {
        padding: 55px 5%;
        min-height: 85vh;
    }

    .hero h1 {
        font-size: 34px;
    }

    .hero p {
        font-size: 16px;
    }

    .section {
        padding: 55px 5%;
    }

    .cards {
        grid-template-columns: 1fr;
    }

    .section h2 {
        font-size: 28px;
    }
}