:root {
    --card-width: 420px;
    --radius: 12px;
    --border: 1px solid #ececec;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
    --input-border: 1px solid #d1d5db;
    --input-radius: 8px;
    --input-padding: 12px 14px;
    --gradient-from: #6d5dfc;
    --gradient-to: #5134ff;
}

* {
    box-sizing: border-box;
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
}

body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: #fafafa;
}

.card {
    width: var(--card-width);
    padding: 40px 48px 48px;
    border-radius: var(--radius);
    border: var(--border);
    background: #fff;
    box-shadow: var(--shadow);
}

h1 {
    margin: 0 0 32px;
    font-size: 28px;
    font-weight: 600;
    color: #1f2937;
}

label {
    display: block;
    margin-bottom: 6px;
    font-size: 14px;
    font-weight: 500;
    color: #374151;
}

input {
    width: 100%;
    padding: var(--input-padding);
    border: var(--input-border);
    border-radius: var(--input-radius);
    font-size: 15px;
    transition: border-color 0.18s ease-in-out, box-shadow 0.18s ease-in-out;
}

input:focus {
    outline: none;
    border-color: #6366f1;
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
}

.field + .field {
    margin-top: 24px;
}

.btn {
    margin-top: 36px;
    width: 100%;
    padding: 14px 0;
    font-size: 15px;
    font-weight: 600;
    color: #fff;
    border: none;
    border-radius: var(--input-radius);
    cursor: pointer;
    background-image: linear-gradient(
            90deg,
            var(--gradient-from),
            var(--gradient-to)
    );
    transition: opacity 0.18s ease-in-out, transform 0.18s ease-in-out;
}

.btn:hover {
    opacity: 0.9;
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}