:root {
    --bg-color: #121212;
    --accent-color: #f9c400;
    --text-color: #e0e0e0;
    --card-bg: #1e1e1e;
    --btn-text: #000000;
}

* {
    box-sizing: border-box;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
    justify-content: center;
    min-height: 100vh;
    min-height: -webkit-fill-available;
    overflow-x: hidden;
    /* Soporte para notch y barras de navegación en iOS / Android */
    padding-top: env(safe-area-inset-top, 0px);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
}

h1,
h2,
h3 {
    font-family: 'Teko', sans-serif;
    text-transform: uppercase;
    color: var(--accent-color);
    margin: 0 0 1rem 0;
    text-shadow: 2px 2px 4px #000;
    letter-spacing: 2px;
}

.container {
    width: 100%;
    max-width: 600px;
    padding: 20px;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    margin-bottom: 2rem;
    border-bottom: 3px solid var(--accent-color);
    padding-bottom: 1rem;
}

.logo-container {
    margin-bottom: 15px;
}

.logo {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    border: 3px solid var(--accent-color);
    box-shadow: 0 0 15px rgba(249, 196, 0, 0.3);
    object-fit: cover;
}

.btn {
    display: block;
    width: 100%;
    padding: 15px;
    margin-bottom: 15px;
    background-color: var(--accent-color);
    color: var(--btn-text);
    text-align: center;
    text-decoration: none;
    font-weight: bold;
    font-size: 1.2rem;
    border: none;
    border-radius: 8px;
    /* Slightly rounded, robust look */
    cursor: pointer;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    transition: transform 0.1s, box-shadow 0.1s;
    text-transform: uppercase;
}

.btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.btn-secondary {
    background-color: #333;
    color: var(--accent-color);
    border: 2px solid var(--accent-color);
}

.card {
    background-color: var(--card-bg);
    padding: 15px;
    margin-bottom: 15px;
    border-radius: 8px;
    border-left: 5px solid var(--accent-color);
}

input[type="text"],
input[type="password"],
textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    background-color: #333;
    border: 2px solid #555;
    color: white;
    font-size: 1rem;
    border-radius: 5px;
    box-sizing: border-box;
}

input[type="text"]:focus,
input[type="password"]:focus {
    border-color: var(--accent-color);
    outline: none;
}

.btn-back {
    background: transparent;
    border: none;
    color: #777;
    margin-top: 20px;
    cursor: pointer;
    font-size: 0.9rem;
}

/* Estilos para soporte PWA y Modal de Instalación */
.btn-pwa {
    background: linear-gradient(135deg, #2e7d32 0%, #1b5e20 100%);
    color: #ffffff;
    border: 2px solid #66bb6a;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-pwa:hover {
    background: linear-gradient(135deg, #388e3c 0%, #2e7d32 100%);
}

.pwa-modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.85);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    padding: 20px;
    backdrop-filter: blur(4px);
}

.pwa-modal {
    background-color: var(--card-bg);
    border: 2px solid var(--accent-color);
    border-radius: 12px;
    padding: 25px 20px;
    max-width: 480px;
    width: 100%;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.7);
    color: var(--text-color);
    text-align: left;
    position: relative;
}

.pwa-modal h3 {
    margin-top: 0;
    color: var(--accent-color);
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 1.6rem;
}

.pwa-steps {
    list-style: none;
    padding: 0;
    margin: 15px 0;
}

.pwa-step {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 16px;
    font-size: 1rem;
    line-height: 1.4;
}

.pwa-step-num {
    background-color: var(--accent-color);
    color: #000;
    font-weight: bold;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.95rem;
}

.pwa-step-icon {
    font-size: 1.2rem;
    vertical-align: middle;
}

.pwa-close-btn {
    margin-top: 10px;
    background-color: #333;
    color: #fff;
    border: 1px solid #777;
}