* { box-sizing: border-box; }

:root {
    --black: #0d0d0e;
    --black-soft: #1c1c1f;
    --yellow: #ffc107;
    --yellow-dark: #e0a800;
    --white: #ffffff;
    --gray-text: #6b6b70;
    --border: #e4e4e7;
}

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, Segoe UI, Roboto, Arial, sans-serif;
    font-size: 16px;
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--black);
    position: relative;
    overflow: hidden auto;
    padding: 16px;
    box-sizing: border-box;

    /* Concepto CENTRAL + MasterKey: fondo blanco tipo "consola central",
       con un resplandor dorado (la "llave") irradiando detrás de la tarjeta. */
    background-color: var(--white);
    background-image:
        radial-gradient(ellipse 1170px 910px at 50% 38%, rgba(255, 193, 7, 0.16), transparent 60%);
}

/* Textura sutil tipo circuito/rejilla para reforzar la idea de "consola central" */
body::before {
    content: "";
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(13, 13, 14, 0.045) 1px, transparent 1px),
        linear-gradient(90deg, rgba(13, 13, 14, 0.045) 1px, transparent 1px);
    background-size: 42px 42px;
    pointer-events: none;
}

.page {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 22px;
    position: relative;
    z-index: 1;
}

.card {
    background: var(--white);
    padding: 44px 40px 34px;
    border-radius: 16px;
    box-shadow: 0 20px 50px rgba(15, 15, 20, 0.14), 0 0 0 1px rgba(0, 0, 0, 0.06);
    /* Ancho calculado directo contra el viewport (no contra el contenedor
       flex, que no tiene un ancho propio del que depender). En pantallas
       grandes ocupa ~33% del ancho real; nunca baja de 340px ni sube de 720px. */
    width: clamp(340px, 33vw, 720px);
    border-top: 6px solid var(--yellow);
    position: relative;
}

@media (max-width: 480px) {
    .card {
        width: calc(100vw - 32px);
        padding: 32px 24px 24px;
    }
}

.powered-by {
    margin-top: 22px;
    color: var(--gray-text);
    font-size: 11px;
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

.brand-badges {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 28px;
    margin-top: 10px;
}

.brand-badges img {
    height: 48px;
    width: auto;
    display: block;
}

.logo {
    display: block;
    width: 100%;
    max-width: 429px;
    height: auto;
    margin: 0 auto 22px;
}

.brand-icon {
    display: block;
    width: 90px;
    height: 90px;
    margin: 0 auto 28px;
}

label {
    display: block;
    font-weight: 600;
    font-size: 13px;
    margin-bottom: 7px;
    color: var(--black);
    text-transform: uppercase;
    letter-spacing: 0.3px;
}

input[type="text"],
input[type="password"] {
    width: 100%;
    padding: 16px 18px;
    margin-bottom: 22px;
    border: 2px solid var(--border);
    border-radius: 10px;
    font-size: 18px;
    background: #fafafa;
    transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

input[type="text"]:focus,
input[type="password"]:focus {
    outline: none;
    border-color: var(--yellow-dark);
    background: var(--white);
    box-shadow: 0 0 0 4px rgba(255, 193, 7, 0.3);
}

.checkbox-row {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 400;
    font-size: 15px;
    color: var(--gray-text);
    margin-bottom: 24px;
    cursor: pointer;
}

.checkbox-row input {
    width: 20px;
    height: 20px;
    margin: 0;
    accent-color: var(--yellow-dark);
}

button {
    width: 100%;
    padding: 17px;
    border: none;
    border-radius: 10px;
    background: var(--yellow);
    color: var(--black);
    font-size: 17px;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    cursor: pointer;
    transition: background 0.15s, transform 0.05s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

button:hover:not(:disabled) {
    background: var(--yellow-dark);
}

button:active:not(:disabled) {
    transform: translateY(1px);
}

button:disabled {
    background: #d4d4d8;
    color: #8a8a8f;
    cursor: default;
}

.status {
    margin-top: 20px;
    padding: 13px 16px;
    border-radius: 10px;
    font-size: 14px;
    text-align: center;
}

.status.error {
    background: #1a1a1c;
    color: var(--yellow);
    border: 1px solid var(--yellow);
}

.status.success {
    background: var(--black);
    color: #ffffff;
    border: 1px solid #2e7d32;
}