:root {
    --ink: #0f1012;
    --charcoal: #1a1c20;
    --slate: #2d3138;
    --fog: #b8bcc6;
    --mist: #d4d7dd;
    --panel: #f2f3f5;
    --paper: #fbfbfc;
    --shadow: 0 14px 36px rgba(8, 8, 10, 0.22);
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(1200px 600px at 100% -10%, #3a3f47 0%, transparent 55%),
        radial-gradient(900px 500px at -10% 110%, #2a2d33 0%, transparent 50%),
        linear-gradient(135deg, #0f1012 0%, #1a1c20 100%);
    font-family: "Montserrat", sans-serif;
    color: var(--ink);
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    background: linear-gradient(180deg, var(--paper) 0%, var(--panel) 100%);
    border: 1px solid #d9dbe0;
    border-radius: 20px;
    box-shadow: var(--shadow);
    max-width: 420px;
    width: 100%;
    margin: 40px auto;
    padding: 38px 32px 30px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

h1 {
    font-weight: 700;
    font-size: 2.2rem;
    margin: 0 0 22px;
    letter-spacing: 1px;
    color: var(--charcoal);
}

h1 span {
    color: var(--slate);
}

form {
    width: 100%;
    display: flex;
    flex-direction: column;
}

input[type="text"] {
    font-size: 1.05rem;
    padding: 12px 16px;
    border: 1px solid #c6cad2;
    border-radius: 7px;
    margin-bottom: 16px;
    outline: none;
    font-family: "Montserrat", sans-serif;
    background: #ffffff;
    color: var(--ink);
}

input[type="text"]:focus {
    border-color: var(--slate);
    box-shadow: 0 0 0 3px rgba(45, 49, 56, 0.14);
}

button {
    background: linear-gradient(90deg, var(--ink), var(--charcoal));
    color: #fff;
    font-weight: 700;
    font-size: 1.05rem;
    padding: 12px 0;
    border: none;
    border-radius: 7px;
    cursor: pointer;
}

button:hover {
    background: linear-gradient(90deg, #23262c, #111214);
}

.result {
    margin-top: 24px;
    width: 100%;
    text-align: center;
    animation: fadeIn 0.5s ease;
}

.result input[type="text"] {
    width: 85%;
    margin: 10px auto;
    text-align: center;
    background: #edf0f4;
    border-color: #c5c9d1;
    cursor: pointer;
}

.result small {
    color: #5a606b;
}

.error {
    color: #7d1111;
    background: #ece7e7;
    border: 1px solid #d7c9c9;
    border-radius: 5px;
    padding: 7px;
    margin-top: 10px;
    text-align: center;
    width: 100%;
    box-sizing: border-box;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 600px) {
    .container {
        padding: 24px 12px 20px;
        max-width: 96vw;
    }

    h1 {
        font-size: 1.5rem;
    }
}