:root {
    --cyan: #03B3FF;
    --blue: #0335FF;
    --purple: #4F03FF;
    --orange: #FF4F03;
    --lime: #B3FF03;

    --bg-color: #02020A;
    --surface-color: #08081A;
    --primary-color: var(--blue);
    --primary-hover: var(--cyan);
    --text-color: #F0F4FF;
    --text-secondary: #8AA1FF;
    --border-color: var(--purple);
    
    --glow-primary: 0 0 15px rgba(3, 53, 255, 0.4);
    --glow-cyan: 0 0 15px rgba(3, 179, 255, 0.4);
    --glow-lime: 0 0 10px rgba(179, 255, 3, 0.3);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* ================= AUTENTICACIÓN ================= */
.auth-section {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: radial-gradient(circle at center, #0a0a2a 0%, var(--bg-color) 70%);
    padding: 20px;
}

.auth-container {
    background-color: var(--surface-color);
    padding: 40px 30px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 40px rgba(79, 3, 255, 0.15);
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-container h1 {
    color: var(--cyan);
    margin-bottom: 5px;
    font-size: 2.2rem;
    text-shadow: var(--glow-cyan);
    letter-spacing: 2px;
}

.auth-container p {
    color: var(--text-secondary);
    margin-bottom: 25px;
}

.auth-container input, textarea {
    width: 100%;
    padding: 12px 15px;
    margin-bottom: 15px;
    background-color: var(--bg-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-sizing: border-box;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.auth-container input:focus, textarea:focus {
    outline: none;
    border-color: var(--cyan);
    box-shadow: var(--glow-cyan);
}

/* Contenedor de contraseña con Switch */
.password-container {
    position: relative;
    width: 100%;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.password-container input[type="password"],
.password-container input[type="text"] {
    margin-bottom: 0;
    padding-right: 65px; /* Espacio para el switch */
    width: 100%;
}

/* Estilos del Switch */
.switch {
    position: absolute;
    right: 15px;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    transition: .4s;
}

.slider:before {
    position: absolute;
    content: "";
    height: 16px;
    width: 16px;
    left: 3px;
    bottom: 3px;
    background-color: var(--text-secondary);
    transition: .4s;
}

input:checked + .slider {
    background-color: var(--cyan);
    border-color: var(--cyan);
    box-shadow: var(--glow-cyan);
}

input:checked + .slider:before {
    transform: translateX(20px);
    background-color: var(--bg-color);
}

.slider.round {
    border-radius: 24px;
}

.slider.round:before {
    border-radius: 50%;
}

/* Botones y Enlaces */
.auth-container button {
    width: 100%;
    margin-bottom: 12px;
    padding: 12px;
    background-color: var(--primary-color);
    color: #FFFFFF;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--glow-primary);
}

.auth-container button:hover:not(:disabled) {
    background-color: var(--primary-hover);
    box-shadow: var(--glow-cyan);
    transform: translateY(-1px);
}

.auth-container button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.google-btn {
    background-color: transparent !important;
    color: var(--cyan) !important;
    border: 1px solid var(--cyan) !important;
    box-shadow: none !important;
}

.google-btn:hover:not(:disabled) {
    background-color: rgba(3, 179, 255, 0.1) !important;
}

.auth-link {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 15px;
}

.auth-link span {
    color: var(--cyan);
    cursor: pointer;
    text-decoration: underline;
    transition: color 0.2s;
}

.auth-link span:hover {
    color: var(--lime);
}

.message {
    margin-top: 15px;
    font-size: 0.9rem;
    padding: 12px;
    border-radius: 8px;
    font-weight: 500;
}

.message.error { 
    color: var(--orange); 
    background-color: rgba(255, 79, 3, 0.1); 
    border: 1px solid rgba(255, 79, 3, 0.3);
}

.message.success { 
    color: var(--lime); 
    background-color: rgba(179, 255, 3, 0.1); 
    border: 1px solid rgba(179, 255, 3, 0.3);
}

.hidden { display: none !important; }

/* ================= APP PRINCIPAL ================= */
header {
    text-align: center;
    padding: 25px 20px;
    background-color: var(--surface-color);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.5);
}

.header-title h1 { 
    margin: 0; 
    color: var(--cyan); 
    font-size: 1.8rem; 
    text-shadow: var(--glow-cyan);
}

.header-title p { 
    margin: 5px 0 0; 
    color: var(--text-secondary); 
    font-size: 0.9rem; 
}

.header-actions {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border-top: 1px solid var(--border-color);
    padding-top: 15px;
    margin-top: 5px;
}

#btnLogout {
    width: auto;
    padding: 6px 16px;
    font-size: 0.85rem;
    background-color: transparent;
    border: 1px solid var(--orange);
    color: var(--orange);
    margin: 0;
    box-shadow: none;
}

#btnLogout:hover {
    background-color: var(--orange);
    color: #FFFFFF;
    box-shadow: 0 0 15px rgba(255, 79, 3, 0.4);
}

main { 
    padding: 20px; 
    max-width: 600px; 
    margin: 0 auto; 
}

.input-section, .saved-section, .anagram-box, .tree-box {
    background-color: var(--surface-color);
    padding: 25px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    margin-bottom: 25px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

label { 
    font-weight: bold; 
    color: var(--cyan); 
    display: block; 
    margin-bottom: 10px; 
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

textarea {
    min-height: 150px;
    resize: vertical;
}

.button-group { 
    display: flex; 
    gap: 15px; 
    margin-top: 20px; 
}

.button-group button { 
    flex: 1; 
    margin: 0; 
}

.secondary {
    background-color: transparent !important;
    border: 1px solid var(--cyan) !important;
    color: var(--cyan) !important;
    box-shadow: none !important;
}

.secondary:hover:not(:disabled) {
    background-color: var(--cyan) !important;
    color: var(--bg-color) !important;
    box-shadow: var(--glow-cyan) !important;
}

.secondary:disabled { 
    opacity: 0.4; 
    cursor: not-allowed; 
    border-color: var(--text-secondary) !important;
    color: var(--text-secondary) !important;
}

h2 { 
    color: var(--cyan); 
    margin-top: 0; 
    font-size: 1.2rem; 
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 10px;
    margin-bottom: 20px;
}

.anagram-text {
    font-size: 2.2rem;
    font-weight: 800;
    letter-spacing: 6px;
    text-align: center;
    margin: 15px 0;
    color: var(--lime);
    text-shadow: var(--glow-lime);
    word-break: break-all;
}

.hint { 
    text-align: center; 
    color: var(--text-secondary); 
    font-size: 0.85rem; 
    font-style: italic; 
    margin-bottom: 20px;
}

#savedList { 
    list-style: none; 
    padding: 0; 
    margin: 0; 
}

.saved-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 0;
    border-bottom: 1px solid var(--border-color);
    transition: background-color 0.2s;
}

.saved-item:last-child { border-bottom: none; }

.saved-item-info { flex-grow: 1; cursor: pointer; }

.saved-item-title { 
    font-weight: bold; 
    color: var(--cyan); 
    font-size: 1.1rem;
    transition: color 0.2s;
}

.saved-item-info:hover .saved-item-title {
    color: var(--lime);
}

.saved-item-date { 
    font-size: 0.8rem; 
    color: var(--text-secondary); 
    margin-top: 4px;
}

.saved-item-actions { display: flex; gap: 10px; }

.saved-item-actions button {
    background: none;
    border: 1px solid var(--orange);
    color: var(--orange);
    cursor: pointer;
    padding: 6px 12px;
    font-size: 0.85rem;
    width: auto;
    margin: 0;
    border-radius: 6px;
    transition: all 0.2s;
    box-shadow: none;
}

.saved-item-actions button:hover { 
    background-color: var(--orange);
    color: #FFFFFF;
    box-shadow: 0 0 10px rgba(255, 79, 3, 0.3);
}

.step { 
    margin-bottom: 20px; 
    padding-bottom: 20px; 
    border-bottom: 1px solid var(--border-color); 
}

.step:last-child { border-bottom: none; }

.step-question { 
    font-weight: bold; 
    font-size: 1.05rem; 
    margin-bottom: 8px; 
    color: var(--text-color);
}

.step-result { 
    color: var(--text-secondary); 
    margin-left: 15px; 
    font-size: 0.95rem; 
    line-height: 1.5;
}

.final-result { 
    color: var(--lime); 
    font-size: 1.1rem;
    text-shadow: var(--glow-lime);
}