:root {
            --navy: #001F3F;
            --slate: #2C3E50;
            --gray: #95A5A6;
            --light: #F8F9FA;
            --border-gray: #BDC3C7;
            --accent-blue: #00A8E8;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }

        body {
            font-family: 'Vazirmatn', sans-serif;
            background-color: var(--light);
            color: var(--slate);
            line-height: 1.7;
        }

        header {
            background-color: var(--navy);
            padding: 1.5rem 2rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            box-shadow: 0 4px 20px rgba(0,0,0,0.15);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: top 0.3 ease;
        }

        #logo-whyno{
            width: 75px ; 
            height: 75px ;
        }

        .nav-links{
            display: flex;
            gap: 2rem;
            align-items:center;
        }

        .nav-links a {
            color: var(--border-gray);
            text-decoration: none;
            font-weight:500;
            font-size: 1.05rem;
            position:relative;
            transition: all 0.3 ease;
        }

        .nav-links a::after {
    content: '';
    position: absolute;
    bottom: -6px;
    right: 0;
    width: 0%;
    height: 3px;
    background: var(--accent-blue);
    transition: width 0.3s ease;
}

.nav-links a:hover {
    color: white;
}

.nav-links a:hover::after {
    width: 100%;
}

        .logo {
            display: flex;
            align-items: center;
            font-size: 2.3rem;
            font-weight: 800;
        }

        .logo span:first-child { color: var(--accent-blue); }
        
        #whyno {
            color: var(--border-gray);
        }
        #beta-version{
            font-size: medium;
            margin-right: 0.5rem;
            color: var(--gray);
        }

        .header-cta {
            padding: 1rem 2.2rem;
            background: linear-gradient(90deg, var(--accent-blue), #009fd9);
            color: white;
            border: none;
            border-radius: 12px;
            font-size: 1.15rem;
            font-weight: 700;
            cursor: pointer;
            transition: all 0.4s ease;
            box-shadow: 0 6px 20px rgba(0,168,232,0.3);
            animation: pulse 2.5s infinite;
            font-family:'Vazirmatn' ;
        }

        .header-cta:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 30px rgba(0,168,232,0.4);
        }

        @keyframes pulse {
            0% { box-shadow: 0 6px 20px rgba(0,168,232,0.3); }
            50% { box-shadow: 0 6px 30px rgba(0,168,232,0.5); }
            100% { box-shadow: 0 6px 20px rgba(0,168,232,0.3); }
        }

        .hero {
            background: linear-gradient(135deg, var(--navy) 0%, var(--slate) 100%);
            color: white;
            text-align: center;
            padding: 7rem 2rem 6rem;
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0; left: 0; right: 0; bottom: 0;
            background: radial-gradient(circle at 30% 70%, rgba(0,168,232,0.15), transparent 50%);
            pointer-events: none;
        }

        .hero h1 {
            font-size: 3.8rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
        }

        .hero h1 span:first-child { color: var(--accent-blue); }

        .hero p {
            font-size: 1.45rem;
            max-width: 850px;
            margin: 0 auto 3rem;
            opacity: 0.95;
        }

        .hero .auth-buttons {
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
        }

        .btn {
            padding: 1.1rem 2.8rem;
            border-radius: 14px;
            font-size: 1.25rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.4s ease;
            min-width: 190px;
        }

        .btn-login {
            background-color: var(--accent-blue);
            color: white;
            border: 3px solid white;
            font-family:'Vazirmatn' ;
        }

        .btn-login:hover {
            background-color: #008cc2;
            transform: translateY(-6px);
            box-shadow: 0 15px 35px rgba(0,168,232,0.4);
        }

        .btn-register {
            background-color: white;
            color: var(--accent-blue);
            border: 3px solid var(--accent-blue);
            font-weight: 700;
            font-family: 'Vazirmatn';
        }

        .btn-register:hover {
            background-color: #f0f8ff;
            transform: translateY(-6px);
            box-shadow: 0 15px 35px rgba(0,0,0,0.2);
        }

        main { max-width: 1400px; margin: 0 auto 5rem; padding: 0 2rem; }

        .section-title {
            text-align: center;
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--navy);
            margin-bottom: 0.5rem;
            position: relative;
        }

        .section-title::after {
            content: '';
            width: 100px;
            height: 5px;
            background: var(--accent-blue);
            display: block;
            margin: 1rem auto 0;
            border-radius: 3px;
        }

        .features {
    padding: 6rem 2rem;
    display: flex;
    justify-content: center;
    background-color: var(--light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr); /* 👈 چهارتایی کنار هم */
    gap: 1rem;
    max-width: 1400px;
    width: 100%;
}

.feature-card {
    background-color: white;
    border-radius: 20px;
    padding: 2.2rem 1.8rem;
    text-align: center;
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
    transition: all 0.4s ease;
    border: 1px solid var(--border-gray);
    opacity: 0;
    transform: translateY(40px);
}

.feature-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 45px rgba(0,168,232,0.25);
    border-color: var(--accent-blue);
}

.feature-card .icon {
    font-size: 3rem;
    margin-bottom: 1.2rem;
}

.feature-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.7rem;
    color: var(--navy);
}

.feature-card p {
    font-size: 1rem;
    color: var(--slate);
    opacity: 0.9;
}


        .about {
            background-color: white;
            border-radius: 20px;
            padding: 4.5rem 3rem;
            text-align: center;
            box-shadow: 0 12px 35px rgba(0,0,0,0.1);
            margin-bottom: 5rem;
            border: 3px solid var(--navy);
        }

        .about h2 {
            font-size: 2.8rem;
            font-weight: 800;
            color: var(--navy);
            margin-bottom: 2rem;
            position: relative;
        }

        .about h2::after {
            content: '';
            width: 80px;
            height: 5px;
            background: var(--accent-blue);
            display: block;
            margin: 1rem auto 0;
            border-radius: 3px;
        }

        .about p {
            font-size: 1.2rem;
            max-width: 900px;
            margin: 0 auto;
            color: var(--gray);
            line-height: 1.8;
        }

        footer {
            background-color: var(--navy);
            color: white;
            padding: 3rem 2rem 1.5rem;
            text-align: center;
        }

        .footer-links {
            display: flex;
            justify-content: center;
            gap: 2rem;
            margin-bottom: 2rem;
            flex-wrap: wrap;
        }

        .footer-links a {
            color: var(--border-gray);
            text-decoration: none;
            font-size: 1.1rem;
            transition: color 0.3s;
        }

        .footer-links a:hover { color: var(--accent-blue); }

        .made-for {
            margin-top: 1.5rem;
            font-size: 1.1rem;
            color: var(--border-gray);
        }

        .made-for .heart {
            color: white;
            font-size: 1.4rem;
            margin-left: 0.5rem;
        }

        .copyright {
            color: var(--gray);
            font-size: 0.9rem;
            margin-top: 1rem;
        }

        @media (max-width: 1024px) {
            .features { grid-template-columns: repeat(2, 1fr); }
        }

        @media (max-width: 768px) {
            .hero h1 { font-size: 3rem; }
            .hero p { font-size: 1.3rem; }
            .section-title { font-size: 2.4rem; }
            .features { grid-template-columns: 1fr; }
            header { flex-direction: column; gap: 1.5rem; }
            .logo { font-size: 2.1rem; }
            .hero .auth-buttons { flex-direction: column; align-items: center; }
            .btn { width: 80%; }
        }

        /* 📱 تبلت */
@media (max-width: 1100px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* 📱 موبایل */
@media (max-width: 600px) {
    .features-grid {
        grid-template-columns: 1fr;
    }
}


@media (max-width: 768px) {
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
}