/* ========================================
   UDNL LOGIN PAGE - MODERN UI/UX
   Paleta: Blanco, Gris Claro y Dorado
   IDs únicos con prefijo: udnl-login-
   ======================================== */

/* Variables CSS para tema elegante */
:root {
    /* Paleta dorada elegante */
    --udnl-primary: #d4a853;
    --udnl-primary-light: #e6be5a;
    --udnl-primary-dark: #b8860b;
    --udnl-accent: #c9a227;
    --udnl-accent-light: #f0d78c;
    --udnl-gradient-1: linear-gradient(135deg, #d4a853 0%, #c9a227 100%);
    --udnl-gradient-2: linear-gradient(135deg, #e6be5a 0%, #d4a853 100%);
    --udnl-shadow-sm: 0 2px 10px rgba(212, 168, 83, 0.1);
    --udnl-shadow-md: 0 8px 30px rgba(212, 168, 83, 0.15);
    --udnl-shadow-lg: 0 20px 60px rgba(212, 168, 83, 0.25);
    --udnl-white: #ffffff;
    --udnl-light-bg: #f8f9fa;
    --udnl-border: #e2e8f0;
    --udnl-text: #1a1a2e;
    --udnl-text-light: #4a4a68;
}

/* Contenedor principal con animación de fondo */
#udnl-login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 50%, #ffffff 100%);
    position: relative;
    overflow: hidden;
    padding: 20px;
}

@keyframes udnl-gradient-shift {
    0%, 100% {
        background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 50%, #ffffff 100%);
    }
    50% {
        background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 50%, #f5f5f5 100%);
    }
}

/* Partículas doradas de fondo animadas */
#udnl-login-container::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 50%, rgba(212, 168, 83, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(230, 190, 90, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 40% 20%, rgba(201, 162, 39, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 60% 60%, rgba(184, 134, 11, 0.08) 0%, transparent 50%);
}

@keyframes udnl-float-particles {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    33% {
        transform: translate(30px, -30px) rotate(120deg);
    }
    66% {
        transform: translate(-20px, 20px) rotate(240deg);
    }
}

/* Tarjeta de login con efecto glassmorphism */
#udnl-login-card {
background: rgba(255, 255, 255, 0.98);
border-radius: 24px;
    padding: 48px 40px;
    width: 100%;
    max-width: 440px;
    box-shadow: var(--udnl-shadow-lg);
    position: relative;
    z-index: 1;
    border: 1px solid rgba(212, 168, 83, 0.2);
    animation: udnl-card-entrance 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    transform-style: preserve-3d;
    will-change: transform;
}

@keyframes udnl-card-entrance {
    0% {
        opacity: 0;
        transform: translateY(50px) scale(0.9) rotateX(20deg);
    }
    60% {
        transform: translateY(-10px) scale(1.02) rotateX(-5deg);
    }
    100% {
        opacity: 1;
        transform: translateY(0) scale(1) rotateX(0deg);
    }
}

#udnl-login-card:hover {
    box-shadow: 0 30px 80px rgba(212, 168, 83, 0.3);
}

/* Logo con animación */
#udnl-login-logo {
    width: 120px;
    height: auto;
    display: block;
    margin: 0 auto 24px;
    filter: drop-shadow(0 4px 12px rgba(212, 168, 83, 0.25));
    animation: udnl-logo-pulse 4s ease-in-out 1;
    transition: transform 0.3s ease;
}

@keyframes udnl-logo-pulse {
    0%, 100% {
        transform: scale(1) translateY(0);
        filter: drop-shadow(0 4px 12px rgba(212, 168, 83, 0.25));
    }
    50% {
        transform: scale(1.08) translateY(-5px);
        filter: drop-shadow(0 8px 20px rgba(212, 168, 83, 0.5));
    }
}

#udnl-login-logo:hover {
    transform: scale(1.1) rotate(5deg);
    filter: drop-shadow(0 8px 20px rgba(212, 168, 83, 0.6));
}

/* Título */
#udnl-login-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--udnl-primary);
    text-align: center;
    margin-bottom: 8px;
    animation: udnl-slide-down 0.6s ease 0.2s both;
}

@keyframes udnl-slide-down {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Subtítulo */
#udnl-login-subtitle {
    font-size: 15px;
    color: var(--udnl-text-light);
    text-align: center;
    margin-bottom: 32px;
    animation: udnl-slide-down 0.6s ease 0.3s both;
}

/* Formulario */
#udnl-login-form {
    animation: udnl-slide-down 0.6s ease 0.4s both;
}

/* Grupo de input con efecto flotante */
.udnl-login-input-group {
    position: relative;
    margin-bottom: 24px;
}

.udnl-login-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
}

/* Icono del input */
.udnl-login-input-icon {
    position: absolute;
    left: 18px;
    font-size: 18px;
    color: var(--udnl-primary);
    transition: all 0.3s ease;
    z-index: 2;
    pointer-events: none;
}

/* Input field */
.udnl-login-input {
    width: 100%;
    padding: 16px 20px 16px 52px;
    border: 2px solid var(--udnl-border);
    border-radius: 12px;
    font-size: 15px;
    color: var(--udnl-text);
    background: var(--udnl-white);
    transition: all 0.3s ease;
    outline: none;
    position: relative;
}

.udnl-login-input::placeholder {
    color: var(--udnl-text-light);
    opacity: 0.7;
}

.udnl-login-input:focus {
    border-color: var(--udnl-primary);
    box-shadow: 
        0 0 0 4px rgba(212, 168, 83, 0.1),
        0 8px 20px rgba(212, 168, 83, 0.15);
    transform: translateY(-2px);
    background: linear-gradient(to bottom, 
        rgba(255, 255, 255, 1) 0%, 
        rgba(248, 249, 250, 1) 100%);
}

.udnl-login-input:focus ~ .udnl-login-input-icon {
    color: var(--udnl-accent);
    transform: scale(1.15) rotate(10deg);
    filter: drop-shadow(0 0 8px rgba(212, 168, 83, 0.5));
}

/* Animación de onda en focus */
.udnl-login-input-wrapper::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--udnl-gradient-1);
    transition: width 0.4s ease;
}

.udnl-login-input:focus ~ .udnl-login-input-wrapper::after {
    width: 100%;
}

/* Botón de submit con efectos modernos */
#udnl-login-submit-btn {
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: 12px;
    background: var(--udnl-gradient-1);
    color: var(--udnl-white);
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    transition: all 0.3s ease;
    margin-top: 8px;
    box-shadow: 0 4px 15px rgba(212, 168, 83, 0.3);
}

#udnl-login-submit-btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s ease, height 0.6s ease;
}

#udnl-login-submit-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(212, 168, 83, 0.4);
}

#udnl-login-submit-btn:hover::before {
    width: 300px;
    height: 300px;
}

#udnl-login-submit-btn:active {
    transform: translateY(0);
}

/* Texto del botón */
#udnl-login-submit-btn span {
    position: relative;
    z-index: 1;
}

/* Footer */
#udnl-login-footer {
    text-align: center;
    margin-top: 32px;
    font-size: 14px;
    color: var(--udnl-text-light);
    animation: udnl-fade-in 0.6s ease 0.5s both;
}

@keyframes udnl-fade-in {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

#udnl-login-footer a {
    color: var(--udnl-primary);
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    position: relative;
}

#udnl-login-footer a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--udnl-accent);
    transition: width 0.3s ease;
}

#udnl-login-footer a:hover {
    color: var(--udnl-accent);
}

#udnl-login-footer a:hover::after {
    width: 100%;
}

/* Borde brillante animado en hover */
#udnl-login-card::before {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, 
        var(--udnl-primary) 0%, 
        var(--udnl-accent) 25%,
        var(--udnl-primary-light) 50%,
        var(--udnl-accent) 75%,
        var(--udnl-primary) 100%);
    background-size: 200% 200%;
    border-radius: 24px;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.4s ease;
    pointer-events: none;
    filter: blur(12px);
}

#udnl-login-card:hover::before {
    opacity: 0.6;
    animation: udnl-border-glow 3s ease infinite;
}

@keyframes udnl-border-glow {
    0%, 100% {
        background-position: 0% 50%;
        filter: blur(12px) brightness(1);
    }
    50% {
        background-position: 100% 50%;
        filter: blur(18px) brightness(1.4);
    }
}

/* Efecto de brillo en hover del card */
#udnl-login-card::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -100%;
    width: 50%;
    height: 200%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.3),
        transparent
    );
    transition: all 0.6s ease;
    pointer-events: none;
    opacity: 0;
}

#udnl-login-card:hover::after {
    left: 150%;
    opacity: 1;
}

/* Responsive Design */
@media (max-width: 768px) {
    #udnl-login-card {
        padding: 36px 24px;
        margin: 20px;
    }

    #udnl-login-title {
        font-size: 24px;
    }

    #udnl-login-logo {
        width: 100px;
    }
}

@media (max-width: 480px) {
    #udnl-login-container {
        padding: 12px;
    }

    #udnl-login-card {
        padding: 28px 18px;
        border-radius: 18px;
    }

    #udnl-login-title {
        font-size: 22px;
    }

    #udnl-login-subtitle {
        font-size: 14px;
        margin-bottom: 24px;
    }

    .udnl-login-input {
        padding: 14px 16px 14px 48px;
        font-size: 14px;
    }

    .udnl-login-input-icon {
        left: 14px;
        font-size: 16px;
    }

    #udnl-login-submit-btn {
        padding: 14px;
        font-size: 15px;
    }

    #udnl-login-footer {
        margin-top: 24px;
        font-size: 13px;
    }
}

/* Animación de carga para el botón */
@keyframes udnl-loading-spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

#udnl-login-submit-btn.loading::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 20px;
    top: 50%;
    left: 50%;
    margin-left: -10px;
    margin-top: -10px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: udnl-loading-spin 0.8s linear infinite;
    z-index: 2;
}

/* Efecto de partículas flotantes adicionales */
.udnl-login-particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: rgba(212, 168, 83, 0.8);
    border-radius: 50%;
    pointer-events: none;
    animation: udnl-particle-float 5s ease-in-out infinite;
    box-shadow: 0 0 10px rgba(212, 168, 83, 0.6);
}

@keyframes udnl-particle-float {
    0% {
        transform: translateY(0) translateX(0) scale(0);
        opacity: 0;
    }
    10% {
        opacity: 1;
        transform: translateY(-10vh) translateX(0) scale(1);
    }
    50% {
        transform: translateY(-50vh) translateX(20px) scale(1.2);
        opacity: 0.8;
    }
    90% {
        opacity: 0.5;
    }
    100% {
        transform: translateY(-100vh) translateX(40px) scale(0.5);
        opacity: 0;
    }
}

/* Accesibilidad */
.udnl-login-input:focus-visible {
    outline: 3px solid var(--udnl-accent);
    outline-offset: 2px;
}

#udnl-login-submit-btn:focus-visible {
    outline: 3px solid var(--udnl-accent);
    outline-offset: 2px;
}