/* General layout */
body, html {
    margin: 0;
    padding: 0;
    height: 100%;
    font-family: Arial, sans-serif;
}

/* Particle background */
#particles-js {
    position: absolute;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-color: #1a1a2e;
    background-image: linear-gradient(135deg, #1a1a2e 0%, #0f0f1a 100%);
}

/* Center container */
.content-container {
    display: flex;
    height: 100%;
    justify-content: center;
    align-items: center;
}

/* Signup Box */
.signup-box {
    width: 330px;
    padding: 30px;
    background: rgba(0,0,0,0.65);
    border-radius: 15px;
    color: #fff;
    text-align: center;
    box-shadow: 0 0 25px rgba(0, 200, 255, 0.5);
}

.signup-box h2 {
    margin-bottom: 20px;
}

/* Input groups */
.input-group {
    display: flex;
    align-items: center;
    background: rgba(255,255,255,0.1);
    border-radius: 8px;
    padding: 8px 10px;
    margin-bottom: 15px;
}

.input-group i {
    margin-right: 10px;
    color: #00c8ff;
}

.input-group input {
    width: 100%;
    color: white;
    background: none;
    border: none;
    outline: none;
}

/* Button */
button {
    width: 100%;
    padding: 12px;
    background: #00c8ff;
    border: none;
    border-radius: 8px;
    color: #000;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

button:hover {
    background: #90ffff;
}

/* Link */
a {
    color: #00c8ff;
    text-decoration: none;
    margin-top: 10px;
    display: inline-block;
}

/* Social */
.social-login p {
    margin-top: 20px;
    color: #90ffff;
}

.social-buttons {
    display: flex;
    justify-content: center;
    gap: 25px;
    margin-top: 10px;
}

.social-btn {
    font-size: 28px;
    color: white;
    transition: transform 0.3s ease;
}

.social-btn:hover {
    transform: scale(1.2);
}

.google { color: #DB4437; }
.twitter { color: #1DA1F2; }
.facebook { color: #1877F2; }

/* ===== RESPONSIVE STYLES ===== */

/* Tablet - Medium screens */
@media screen and (max-width: 768px) {
    .signup-box {
        width: 90%;
        max-width: 380px;
        padding: 25px 20px;
        margin: 20px;
    }

    .signup-box h2 {
        font-size: 1.5rem;
    }

    .input-group {
        padding: 10px 12px;
    }

    .input-group input {
        font-size: 16px; /* Prevents zoom on iOS */
    }

    button {
        padding: 14px;
        font-size: 1rem;
    }

    .social-buttons {
        gap: 20px;
    }

    .social-btn {
        font-size: 24px;
    }
}

/* Mobile - Small screens */
@media screen and (max-width: 480px) {
    .content-container {
        padding: 15px;
        min-height: 100vh;
        box-sizing: border-box;
    }

    .signup-box {
        width: 100%;
        max-width: 100%;
        padding: 20px 15px;
        margin: 10px;
        border-radius: 12px;
        box-shadow: 0 0 15px rgba(0, 200, 255, 0.4);
    }

    .signup-box h2 {
        font-size: 1.3rem;
        margin-bottom: 15px;
    }

    label {
        font-size: 0.9rem;
    }

    .input-group {
        padding: 12px;
        margin-bottom: 12px;
        border-radius: 10px;
    }

    .input-group i {
        font-size: 14px;
        margin-right: 8px;
    }

    .input-group input {
        font-size: 16px;
    }

    button {
        padding: 15px;
        font-size: 1rem;
        border-radius: 10px;
    }

    a {
        font-size: 0.9rem;
        margin-top: 15px;
    }

    .social-login p {
        font-size: 0.85rem;
        margin-top: 15px;
    }

    .social-buttons {
        gap: 25px;
        margin-top: 8px;
    }

    .social-btn {
        font-size: 26px;
        padding: 8px;
    }
}

/* Extra small screens */
@media screen and (max-width: 320px) {
    .signup-box {
        padding: 15px 10px;
    }

    .signup-box h2 {
        font-size: 1.2rem;
    }

    .social-buttons {
        gap: 15px;
    }

    .social-btn {
        font-size: 22px;
    }
}