/* ============================================
   RESET Y CONFIGURACIÓN BASE
   ============================================ */
* {
    box-sizing: border-box;
}

body,
html {
    margin: 0;
    padding: 0;
    overflow-x: hidden;
    width: 100%;
    height: 100%;
}

/* ============================================
   CONTENEDOR PRINCIPAL
   ============================================ */
.login-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    width: 100%;
    background: var(--color-primary);
    font-family: var(--font-family-main);
    padding: 1rem;
    box-sizing: border-box;
    overflow: hidden;
}

/* ============================================
   TARJETA DE LOGIN
   ============================================ */
.login-card {
    background: var(--color-surface);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    width: 100%;
    max-width: 400px;
    text-align: center;
    animation: fadeInUp 0.6s ease forwards;
}

.login-logo {
    width: 420px;
    height: auto;
    object-fit: contain;
    margin: 0 auto 0.5rem;
    display: block;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.login-title {
    font-size: 1.8rem;
    color: var(--color-text);
    margin-bottom: 0.3rem;
}

.login-subtitle {
    color: var(--color-text-light);
    font-size: var(--font-size-sm);
    margin-bottom: 1.5rem;
}

/* ============================================
   MENSAJES DE ERROR
   ============================================ */
.login-error {
    background-color: #ffe5e5;
    color: #d8000c;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    margin-bottom: 1rem;
    font-size: 0.9rem;
}

/* ============================================
   FORMULARIO
   ============================================ */
.login-form .form-group {
    margin-bottom: 1.2rem;
    text-align: left;
}

.login-form label {
    display: block;
    font-weight: var(--font-weight-semibold);
    margin-bottom: 0.4rem;
    color: var(--color-text);
}

.login-form input {
    width: 100%;
    padding: 0.6rem 0.8rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    transition: border-color 0.2s, box-shadow 0.2s;
    box-sizing: border-box;
    font-size: 16px;
}

.login-form input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(76, 175, 80, 0.2);
}

/* ============================================
   BOTONES
   ============================================ */
.btn-primary {
    background-color: var(--color-primary);
    color: #fff;
    padding: 0.7rem 1.2rem;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-weight: 600;
    width: 100%;
    transition: background-color 0.2s, transform 0.1s;
    box-sizing: border-box;
}

.btn-primary:hover {
    background-color: var(--color-primary-hover);
    transform: scale(1.02);
}

/* ============================================
   PRELOADER Y ANIMACIONES
   ============================================ */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-primary);
    z-index: 9999;
    display: none;
    justify-content: center;
    align-items: center;
    transition: opacity 0.3s ease;
}

.loader {
    border: 4px solid var(--color-surface);
    border-top: 4px solid var(--color-primary-hover);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

/* Tablets grandes y laptops pequeños (769px - 1024px) */
@media (max-width: 1024px) {
    .login-card {
        max-width: 420px;
        padding: 2.25rem;
    }

    .login-logo {
        width: 360px;
        height: auto;
    }

    .login-title {
        font-size: 1.7rem;
    }
}

/* Tablets (481px - 768px) */
@media (max-width: 768px) {
    .login-container {
        padding: 1.5rem;
    }

    .login-card {
        max-width: 95%;
        padding: 2rem 1.75rem;
    }

    .login-logo {
        width: 340px;
        height: auto;
    }

    .login-title {
        font-size: 1.6rem;
    }

    .login-subtitle {
        font-size: 0.9rem;
    }

    .login-form input {
        padding: 0.65rem 0.85rem;
        font-size: 1rem;
    }

    .btn-primary {
        padding: 0.75rem 1.2rem;
        font-size: 1rem;
    }
}

/* Móviles grandes (376px - 480px) */
@media (max-width: 480px) {
    .login-container {
        padding: 0.75rem;
    }

    .login-card {
        padding: 1.75rem 1.25rem;
        max-width: 100%;
        margin: 0;
    }

    .login-logo {
        width: 320px;
        height: auto;
        margin-bottom: 0.4rem;
    }

    .login-title {
        font-size: 1.5rem;
        margin-bottom: 0.25rem;
    }

    .login-subtitle {
        font-size: 0.85rem;
        margin-bottom: 1.25rem;
    }

    .login-form .form-group {
        margin-bottom: 1rem;
    }

    .login-form label {
        font-size: 0.9rem;
        margin-bottom: 0.35rem;
    }

    .login-form input {
        padding: 0.6rem 0.75rem;
        font-size: 16px;
    }

    .btn-primary {
        padding: 0.7rem 1rem;
        font-size: 0.95rem;
    }

    .login-error {
        padding: 0.65rem;
        font-size: 0.85rem;
    }
}

/* Móviles pequeños (320px - 375px) */
@media (max-width: 375px) {
    .login-container {
        padding: 0.5rem;
    }

    .login-card {
        padding: 1.5rem 1rem;
        max-width: 100%;
        margin: 0;
    }

    .login-logo {
        width: 300px;
        height: auto;
    }

    .login-title {
        font-size: 1.4rem;
    }

    .login-subtitle {
        font-size: 0.8rem;
    }

    .login-form input {
        padding: 0.55rem 0.7rem;
    }

    .btn-primary {
        padding: 0.65rem 1rem;
    }
}

/* Pantallas muy pequeñas (menos de 320px) */
@media (max-width: 320px) {
    .login-container {
        padding: 0.5rem;
    }

    .login-card {
        padding: 1.25rem 0.75rem;
        max-width: 100%;
        margin: 0;
    }

    .login-logo {
        width: 260px;
        height: auto;
    }

    .login-title {
        font-size: 1.3rem;
    }

    .login-subtitle {
        font-size: 0.75rem;
    }

    .login-form label {
        font-size: 0.85rem;
    }

    .login-form input {
        padding: 0.5rem 0.65rem;
        font-size: 14px;
    }

    .btn-primary {
        padding: 0.6rem 0.9rem;
        font-size: 0.9rem;
    }
}

/* Orientación landscape en móviles */
@media (max-width: 768px) and (orientation: landscape) {
    body,
    html {
        overflow-y: auto;
    }

    .login-container {
        padding: 0.5rem;
        align-items: flex-start;
        overflow-y: auto;
        overflow-x: hidden;
        min-height: 100vh;
    }

    .login-card {
        margin: 0.5rem auto;
        padding: 1.25rem;
        max-width: 500px;
    }

    .login-logo {
        width: 220px;
        height: auto;
        margin-bottom: 0.2rem;
    }

    .login-title {
        font-size: 1.4rem;
        margin-bottom: 0.2rem;
    }

    .login-subtitle {
        font-size: 0.8rem;
        margin-bottom: 1rem;
    }

    .login-form .form-group {
        margin-bottom: 0.85rem;
    }

    .login-form input {
        padding: 0.5rem 0.7rem;
    }

    .btn-primary {
        padding: 0.6rem 1rem;
    }
}

/* Mejoras de accesibilidad táctil */
@media (hover: none) and (pointer: coarse) {
    .btn-primary {
        min-height: 44px;
    }

    .login-form input {
        min-height: 44px;
    }
}