:root {
    --cz-primary: #4f46e5;
    --cz-primary-dark: #4338ca;
    --cz-ink: #1f2440;
    --cz-ink-soft: #6b7280;
    --cz-border: #e5e7eb;
    --cz-bg: #f4f5fb;
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--cz-bg);
    background-image: radial-gradient(circle at 15% 15%, #eef0fd 0%, var(--cz-bg) 45%);
    margin: 0;
    padding: 24px;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
}

.container {
    width: 100%;
    max-width: 380px;
    padding: 2.5rem 2.25rem;
    background-color: #fff;
    border: 1px solid var(--cz-border);
    border-radius: 1rem;
    box-shadow: 0 1px 2px rgba(31, 36, 64, 0.04), 0 20px 40px -16px rgba(31, 36, 64, 0.18);
}

.imagen-encabezado {
    display: block;
    max-width: 96px;
    max-height: 96px;
    width: auto;
    height: auto;
    margin: 0 auto 1.25rem;
    object-fit: contain;
}

h2 {
    margin: 0 0 1.5rem;
    text-align: center;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--cz-ink);
}

label {
    color: var(--cz-ink-soft);
}

input[type="email"],
input[type="password"] {
    width: 100%;
    margin-bottom: 0.9rem;
    padding: 0.7rem 0.9rem;
    border: 1px solid var(--cz-border);
    border-radius: 0.6rem;
    font-size: 0.95rem;
    color: var(--cz-ink);
    background-color: #fafafc;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

input[type="email"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: var(--cz-primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.15);
    background-color: #fff;
}

button {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--cz-primary);
    color: #fff;
    border: none;
    border-radius: 0.6rem;
    font-size: 0.95rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: background-color 0.15s ease, box-shadow 0.15s ease;
    box-shadow: 0 8px 16px -8px rgba(79, 70, 229, 0.5);
}

button:hover {
    background-color: var(--cz-primary-dark);
}

a {
    color: var(--cz-primary);
    text-decoration: none;
    font-size: 0.85rem;
    display: block;
    margin-top: 0.9rem;
    text-align: center;
}

a:hover {
    text-decoration: underline;
}