* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 1rem;
    background-color: #f5f5f5;
    color: #333;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: linear-gradient(135deg, #f5f7fa 0%, #e4e8eb 100%);
    line-height: 1.6;
}

.container {
    text-align: center;
    background-color: white;
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    max-width: 500px;
    width: 92%;
    margin: 1rem;
}

.logo {
    width: 160px;
    max-width: 70%;
    height: auto;
    margin-bottom: 0.5rem;
}

h1 {
    color: #495057;
    margin-bottom: 0.5rem;
    font-size: 1.75rem;
    font-weight: 600;
    line-height: 1.3;
}

h2 {
    color: #7f8c8d;
    font-weight: 400;
    margin-top: 0;
    margin-bottom: 1.5rem;
    font-size: 1rem;
    line-height: 1.4;
}

.btn-login {
    background-color: #3498db;
    color: white;
    border: none;
    padding: 14px 32px;
    font-size: 1rem;
    border-radius: 8px;
    text-decoration: none;
    display: inline-block;
    margin-top: 1rem;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: all 0.3s ease;
    cursor: pointer;
    font-weight: 500;
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-login:hover {
    background-color: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

.btn-login:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

/* ============================ */
/* MEDIA QUERIES RESPONSIVAS */
/* ============================ */

/* Móviles pequeños (hasta 375px) */
@media (max-width: 375px) {
    body {
        padding: 0.75rem;
        align-items: flex-start;
        padding-top: 2rem;
        min-height: 100vh;
    }
    
    .container {
        padding: 1.5rem 1.25rem;
        margin: 0;
        width: 100%;
        border-radius: 10px;
        box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
    }
    
    .logo {
        width: 140px;
        margin-bottom: 0.25rem;
    }
    
    h1 {
        font-size: 1.5rem;
        margin-bottom: 0.25rem;
    }
    
    h2 {
        font-size: 0.9rem;
        margin-bottom: 1.25rem;
    }
    
    .btn-login {
        padding: 12px 24px;
        font-size: 1rem;
        width: 100%;
        min-height: 46px;
    }
    
    .btn-login:hover {
        transform: none;
    }
}

/* Móviles medianos (376px - 480px) */
@media (max-width: 480px) {
    body {
        padding: 1rem;
    }
    
    .container {
        padding: 1.75rem 1.5rem;
        width: 100%;
    }
    
    .logo {
        width: 150px;
    }
    
    h1 {
        font-size: 1.6rem;
    }
    
    h2 {
        font-size: 0.95rem;
    }
    
    .btn-login {
        padding: 13px 28px;
        min-height: 46px;
    }
}

/* Tablets pequeñas (481px - 600px) */
@media (min-width: 481px) and (max-width: 600px) {
    .container {
        padding: 2rem 1.75rem;
        max-width: 420px;
    }
    
    .logo {
        width: 160px;
    }
    
    h1 {
        font-size: 1.7rem;
    }
}

/* Tablets medianas (601px - 768px) */
@media (min-width: 601px) and (max-width: 768px) {
    .container {
        padding: 2.5rem 2rem;
        max-width: 450px;
    }
    
    .logo {
        width: 170px;
    }
    
    h1 {
        font-size: 1.8rem;
    }
    
    h2 {
        font-size: 1.05rem;
    }
    
    .btn-login {
        padding: 15px 34px;
        font-size: 1.05rem;
        min-height: 50px;
    }
}

/* Pantallas grandes (769px - 1024px) */
@media (min-width: 769px) and (max-width: 1024px) {
    .container {
        max-width: 480px;
        padding: 3rem 2.5rem;
    }
    
    .logo {
        width: 180px;
    }
    
    h1 {
        font-size: 1.9rem;
    }
    
    h2 {
        font-size: 1.1rem;
    }
}

/* Pantallas muy grandes (1025px+) */
@media (min-width: 1025px) {
    .container {
        max-width: 500px;
        padding: 3rem 2.5rem;
    }
    
    .logo {
        width: 180px;
    }
    
    h1 {
        font-size: 2rem;
    }
    
    h2 {
        font-size: 1.1rem;
    }
    
    .btn-login {
        padding: 16px 36px;
        font-size: 1.1rem;
        min-height: 52px;
    }
}

/* Dispositivos con pantalla táctil */
@media (hover: none) {
    .btn-login:hover {
        transform: none;
        box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    }
    
    .btn-login:active {
        transform: scale(0.98);
        background-color: #2471a3;
    }
}

/* Orientación landscape en móviles */
@media (max-height: 600px) and (max-width: 768px) {
    body {
        align-items: flex-start;
        padding-top: 1rem;
        min-height: auto;
        padding-bottom: 1rem;
    }
    
    .container {
        padding: 1.5rem;
        margin-top: 1rem;
        max-width: 400px;
    }
    
    .logo {
        width: 120px;
    }
    
    h1 {
        font-size: 1.4rem;
        margin-bottom: 0.25rem;
    }
    
    h2 {
        font-size: 0.85rem;
        margin-bottom: 1rem;
    }
    
    .btn-login {
        padding: 12px 24px;
        min-height: 44px;
        margin-top: 0.5rem;
    }
}

/* Para dispositivos con notch (iPhones modernos) */
@supports(padding: max(0px)) {
    .container {
        padding-left: max(1.25rem, env(safe-area-inset-left));
        padding-right: max(1.25rem, env(safe-area-inset-right));
    }
    
    body {
        padding-left: max(0.75rem, env(safe-area-inset-left));
        padding-right: max(0.75rem, env(safe-area-inset-right));
        padding-top: max(1rem, env(safe-area-inset-top));
        padding-bottom: max(1rem, env(safe-area-inset-bottom));
    }
}

/* Mejora de accesibilidad para enfoque */
.btn-login:focus-visible {
    outline: 2px solid #3498db;
    outline-offset: 2px;
}

/* Reducción de movimiento para usuarios que lo prefieran */
@media (prefers-reduced-motion: reduce) {
    .btn-login {
        transition: none;
    }
    
    .btn-login:hover {
        transform: none;
    }
}