* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', system-ui, sans-serif;
}

/* ---------- BODY LAYOUT ---------- */
body {
    margin: 0;
    padding-top: 90px; /* header ke liye */
    background: #0b0f2a; /* tumhara dark theme wapas */
    color: white;
}

body {
    background: radial-gradient(circle at center, #0b0f2a, #020617);
}

.main-header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(10, 15, 40, 0.95);
    backdrop-filter: blur(10px);
    padding: 15px 0;
    text-align: center;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.header-content h1 {
    margin: 0;
    font-size: 28px;
    color: #ffffff;
    font-weight: 600;
}

.header-content p {
    margin: 5px 0 0;
    font-size: 14px;
    color: #b0b3ff;
}

/* ---------- MAIN CONTAINER ---------- */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 20px;
}

@media (min-width: 768px) {
    .container {
        display: flex;
        justify-content: center;
        gap: 40px;
        align-items: flex-start;
    }

    .card {
        width: 400px;
    }
}

/* ---------- CARD ---------- */
.card {
    width: 100%;
    max-width: 400px;
    margin: 20px auto;
}

/* ---------- HEADINGS ---------- */
h3 {
    font-size: 18px;
    margin-bottom: 6px;
}

.sub {
    font-size: 14px;
    color: #94a3b8;
    margin-bottom: 18px;
    line-height: 1.4;
}

/* ---------- INPUT LAYOUT ---------- */
.row {
    display: flex;
    gap: 12px;
}

.row div {
    flex: 1;
}

label {
    display: block;
    margin: 14px 0 6px;
    font-size: 14px;
    font-weight: 600;
    color: #cbd5f5;
}

/* ---------- INPUTS ---------- */
input {
    width: 100%;
    padding: 12px 14px;
    border-radius: 14px;
    border: 1.5px solid #1e293b;
    background: #020617;
    color: #e5e7eb;
    font-size: 15px;

    transition: border 0.2s ease, box-shadow 0.2s ease;
}

input:focus {
    outline: none;
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99,102,241,0.3);
}

/* ---------- BUTTON ---------- */
button {
    margin-top: 18px;
    width: 100%;
    padding: 12px;
    border-radius: 16px;
    border: none;

    background: linear-gradient(135deg, #6366f1, #4338ca);
    color: #ffffff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;

    box-shadow: 0 6px 18px rgba(79,70,229,0.45);
    transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 26px rgba(79,70,229,0.6);
}

/* ---------- RESULT / INFO ---------- */
.result,
.hint {
    margin-top: 14px;
    padding: 12px;
    border-radius: 14px;
    font-size: 14px;
    font-weight: 600;

    background: #020617;
    border: 1px solid #1e293b;
    color: #a5b4fc;
}

/* ---------- FOOTER ---------- */
.footer {
    width: 100%;
    margin-top: auto; /* 👈 footer always at bottom after scroll */
    padding: 22px 16px;
    text-align: center;

    border-top: 1px solid #1e293b;
    color: #94a3b8;
}

.footer-name {
    font-size: 14px;
    font-weight: 600;
    color: #e5e7eb;
}

.footer-name span {
    color: #a5b4fc;
}

.footer-sub {
    font-size: 13px;
    margin-top: 4px;
}

.footer-links {
    margin: 12px 0;
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.footer-links a {
    font-size: 13px;
    color: #a5b4fc;
    text-decoration: none;
}

.footer-links a:hover {
    color: #6366f1;
}

.footer-copy {
    font-size: 12px;
    color: #64748b;
}

/* ---------- MOBILE RESPONSIVE ---------- */
@media (max-width: 480px) {
    .row {
        flex-direction: column;
    }

    h3 {
        font-size: 16px;
    }

    .sub {
        font-size: 13px;
    }

    button {
        font-size: 14px;
        padding: 11px;
    }
}

@media (max-width: 480px) {

    /* Container full width */
    .container {
        display: block;
        padding: 10px;
    }

    /* Cards full width */
    .card {
        width: 100%;
        margin: 15px 0;
        padding: 15px;
    }

    /* Input fields vertical */
    .input-group {
        display: flex;
        flex-direction: column;
        gap: 10px;
    }

    input {
        width: 100%;
        font-size: 16px;
        padding: 12px;
    }

    /* Button full width */
    button {
        width: 100%;
    }

    /* Header adjust */
    .main-header h1 {
        font-size: 20px;
    }

    .main-header p {
        font-size: 12px;
    }
}