:root {
    --primary-color: #004b8d;
    --primary-light: #0066c1;
    --secondary-color: #00a896;
    --accent-color: #ff6f00;
    --bg-color: #ffffff;
    --card-bg: #ffffff;
    --text-color: #212529;
    --muted-text: #6c757d;
    --success-color: #28a745;
    --error-color: #dc3545;
    --border-radius: 12px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

* {
    box-sizing: border-box;
}

body.untref-edtech-app {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* For seamless embedding */
html,
body {
    overflow-y: auto;
    scrollbar-width: none;
    /* Firefox */
    -ms-overflow-style: none;
    /* IE/Edge */
}

body::-webkit-scrollbar {
    display: none;
    /* Chrome/Safari */
}

.chatgpt {
    background: #000000 !important;
    color: white !important;
    border: none !important;
}

.chatgpt svg {
    margin-right: 8px;
}

.gemini {
    background: #4285f4 !important;
    color: white !important;
    border: none !important;
}

.claude {
    background: #d97757 !important;
    color: white !important;
    border: none !important;
}

.hf {
    background: #ffbd00 !important;
    color: #000 !important;
    border: none !important;
}

.perplexity {
    background: #20b2aa !important;
    color: white !important;
    border: none !important;
}

.yg {
    background: #f44336 !important;
    color: white !important;
    border: none !important;
    width: 60px !important;
    border-radius: 20px !important;
}

.copy-instruction {
    font-size: 0.85rem;
    color: #666;
    margin: 10px 0 15px;
    font-style: italic;
}

.close-btn {
    color: var(--text-color);
}

h1,
h2,
h3 {
    font-family: 'Outfit', sans-serif;
    color: var(--primary-color);
}

.app-header {
    background: #ffffff;
    padding: 1rem 1.5rem;
    text-align: center;
    border-bottom: 1px solid #f0f0f0;
}

.header-title {    margin: 0;    font-size: 1.8rem;    letter-spacing: -0.5px;    text-transform: uppercase;}.header-subtitle {    margin: 0.3rem 0 0;    font-size: 1.1rem;    color: var(--muted-text);}

.app-nav {
    display: flex;
    justify-content: center;
    background: var(--primary-color);
    padding: 0.5rem;
    gap: 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-btn {
    background: transparent;
    border: none;
    color: white;
    padding: 0.75rem 1.5rem;
    cursor: pointer;
    font-weight: 600;
    border-radius: var(--border-radius);
    transition: all 0.3s ease;
}

.nav-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.nav-btn.active {
    background: white;
    color: var(--primary-color);
}

/* Home button container at the bottom */
.main-back-container {
    padding: 3rem 1.5rem;
    text-align: center;
    max-width: 1000px;
    margin: 0 auto;
}

.action-btn.back-main-btn {
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    background: var(--primary-color) !important;
    gap: 10px;
    padding: 1.2rem 2.5rem;
    font-size: 1.1rem;
    box-shadow: 0 4px 15px rgba(0, 75, 141, 0.2);
}

.action-btn.back-main-btn:hover {
    background: var(--primary-light) !important;
    transform: translateY(-2px) scale(1.05);
}

/* Hamburger Menu styles */
.hamburger-btn {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 28px;
    height: 22px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    margin-right: auto;
}

.hamburger-btn span {
    width: 100%;
    height: 3px;
    background: white;
    border-radius: 10px;
    transition: all 0.3s ease;
}

.hamburger-btn.open span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger-btn.open span:nth-child(2) {
    opacity: 0;
}

.hamburger-btn.open span:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

@media (max-width: 768px) {
    .app-nav {
        padding: 0.8rem 1.5rem;
        justify-content: space-between;
        align-items: center;
    }

    .hamburger-btn {
        display: flex;
        order: 1;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--primary-color);
        flex-direction: column;
        padding: 1rem;
        box-shadow: 0 10px 15px rgba(0,0,0,0.1);
        z-index: 99;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-btn {
        width: 100%;
        text-align: left;
    }

    .nav-btn.back-btn {
        margin-right: 0;
        margin-bottom: 0.5rem;
    }
}

.app-content {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.activity-section {
    display: none;
    background: var(--card-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    border: 1px solid #eee;
}

.activity-section.active {
    display: block;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Drag & Drop Paired Layout */
.drag-container {
    margin: 2rem 0;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.word-pool {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    padding: 1.5rem;
    background: rgba(0, 0, 0, 0.05);
    border-radius: var(--border-radius);
    min-height: 80px;
    justify-content: center;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.draggable {
    background: var(--primary-light);
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 20px;
    cursor: grab;
    user-select: none;
    font-size: 0.95rem;
    font-weight: 600;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.2s, background 0.3s;
}

.draggable.dragging {
    opacity: 0.5;
}

.drop-zones {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
}

.drop-slot {
    background: white;
    border: 2px solid #e0e0e0;
    border-radius: var(--border-radius);
    padding: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.8rem;
    transition: border-color 0.3s;
}

.drop-slot:hover {
    border-color: var(--primary-color);
}

/* AI Lab Disclaimer Premium Styling */
.innovar-disclaimer {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-left: 5px solid var(--primary-color);
    padding: 1.5rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.innovar-disclaimer p {
    margin: 0;
    color: var(--text-color);
    font-size: 1.05rem;
    line-height: 1.7;
}

.innovar-disclaimer strong {
    color: var(--primary-color);
}

/* AI Lab Redesign */
.word-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-top: 1rem;
}

.word-card {
    background: white;
    padding: 1.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.05);
    border: 1px solid #eee;
    text-align: center;
    transition: transform 0.3s ease, border-color 0.3s;
}

.word-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
}

.word-card h3 {
    margin: 0;
    font-size: 1.2rem;
    color: var(--primary-color);
    text-transform: uppercase;
}

.word-card p {
    color: var(--muted-text);
    font-size: 0.9rem;
    margin: 0.5rem 0 1.2rem;
}

.card-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    justify-content: center;
}

.card-btn {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    font-size: 1.1rem;
    background: #f8f9fa;
    border: 1px solid #ddd;
    transition: all 0.2s;
}

.card-btn:hover {
    background: #eee;
    transform: scale(1.1);
}

.card-btn.prompt {
    background: var(--secondary-color);
    color: white;
    border: none;
    cursor: pointer;
}

.card-btn.yt {
    background: #ff0000;
    color: white;
    border: none;
}

.prompt-btn-text {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 6px 15px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: bold;
    cursor: pointer;
    width: 100%;
    margin-bottom: 10px;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal-content {
    background: #ffffff;
    color: var(--text-color);
    width: 90%;
    max-width: 650px;
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.2);
    border: 1px solid #eee;
    max-height: 90vh;
    overflow-y: auto;
}

.prompt-content {
    font-family: 'Inter', sans-serif;
    background: #f1f3f5;
    color: #333;
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid #dee2e6;
    line-height: 1.6;
    font-size: 1rem;
    margin: 1.5rem 0;
    white-space: pre-wrap;
    user-select: all;
}

.ai-platform-links {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    justify-content: center;
    margin-top: 1rem;
}

.ai-button {
    text-decoration: none;
    padding: 10px 18px;
    border-radius: 8px;
    font-size: 0.85rem;
    font-weight: bold;
    color: white;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 8px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.ai-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.ai-badge {
    background: rgba(255, 255, 255, 0.2);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.7rem;
}

.modal-footer {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 1.5rem;
    margin-top: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.slot-label {
    font-weight: 700;
    color: var(--primary-color);
    font-size: 1.1rem;
    text-transform: uppercase;
}

.slot-content {
    min-height: 45px;
    width: 100%;
    background: #fcfcfc;
    border: 1px dashed #ccc;
    border-radius: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Fill in Blanks */
.word-bank {
    display: flex;
    flex-wrap: wrap;
    gap: 0.8rem;
    padding: 1rem;
    background: rgba(0, 75, 141, 0.05);
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    justify-content: center;
    border: 1px solid rgba(0, 75, 141, 0.1);
}

.bank-word {
    background: white;
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    border: 1px solid #ddd;
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 600;
}

.fill-paragraph {
    font-size: 1.1rem;
    line-height: 2.2;
    text-align: justify;
}

.fill-input {
    border: none;
    border-bottom: 2px solid var(--primary-color);
    background: rgba(0, 75, 141, 0.05);
    padding: 2px 8px;
    width: auto;
    min-width: 80px;
    text-align: center;
    font-family: inherit;
    font-weight: 600;
    margin: 0 4px;
    border-radius: 4px 4px 0 0;
    transition: all 0.3s ease;
}

.fill-input::placeholder {
    color: var(--error-color);
    font-size: 0.85rem;
    opacity: 0.8;
}

/* Crossword */
.crossword-container {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
    align-items: flex-start;
    justify-content: center;
    margin-top: 1rem;
}

.grid-layout {
    background: white;
    padding: 10px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.grid-cell {
    width: 25px;
    height: 25px;
    border: 1px solid #ddd;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: white;
}

.grid-cell input {
    width: 100%;
    height: 100%;
    border: none;
    text-align: center;
    font-size: 1rem;
    font-weight: bold;
    text-transform: uppercase;
}

.empty-cell {
    background: #333;
    border-color: #333;
}

.cell-num {
    position: absolute;
    top: 1px;
    left: 1px;
    font-size: 0.55rem;
    color: var(--primary-color);
    font-weight: bold;
    z-index: 10;
    line-height: 1;
    background: rgba(255, 255, 255, 0.8);
    pointer-events: none;
}

.clues {
    flex: 1;
    min-width: 250px;
    text-align: left;
}

.clues ul {
    list-style: none;
    padding: 0;
}

.clues li {
    margin-bottom: 0.8rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #eee;
}

.hangman-container {
    display: flex;
    align-items: center;
    gap: 3rem;
    flex-wrap: wrap;
    justify-content: center;
}

.word-display {
    font-size: 2.5rem;
    letter-spacing: 0.5rem;
    font-family: monospace;
    margin-bottom: 1.5rem;
}

/* Scoring & Buttons */
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
    border-bottom: 2px solid rgba(0, 75, 141, 0.1);
    padding-bottom: 0.5rem;
}

.score-display {
    display: flex;
    gap: 4px;
}

.untref-star {
    font-size: 1.5rem;
    color: #ffd700;
    text-shadow: 0 0 5px rgba(255, 215, 0, 0.5);
    animation: bounce 0.5s ease;
}

@keyframes bounce {

    0%,
    100% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.3);
    }
}

.action-bar {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.action-btn.secondary {
    background: #6c757d;
}

.alphabet {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(35px, 1fr));
    gap: 5px;
    max-width: 400px;
}

.letter-btn {
    padding: 10px;
    cursor: pointer;
    border: 1px solid #ddd;
    background: white;
    border-radius: 5px;
}

.letter-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.letter-btn.correct {
    background: var(--success-color);
    color: white;
}

.letter-btn.wrong {
    background: var(--error-color);
    color: white;
}

/* Action Buttons */
.action-btn {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-weight: 700;
    margin-top: 2rem;
    transition: transform 0.2s;
}

.action-btn:hover {
    transform: scale(1.02);
    filter: brightness(1.1);
}

/* Toast */
.toast {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 1rem 2rem;
    border-radius: 50px;
    color: white;
    font-weight: 600;
    z-index: 1000;
    transition: opacity 0.3s;
}

.toast.success {
    background: var(--success-color);
}

.toast.error {
    background: var(--error-color);
}

.hidden {
    opacity: 0;
    pointer-events: none;
}

.game-instructions {
    background: rgba(0, 75, 141, 0.05);
    border-left: 4px solid var(--primary-color);
    padding: 1rem 1.5rem;
    margin-bottom: 2rem;
    border-radius: 0 8px 8px 0;
    font-size: 0.95rem;
    color: #444;
    line-height: 1.5;
    text-align: left;
}

.game-instructions strong {
    color: var(--primary-color);
}

.scramble-container,
.typing-container {
    padding: 2.5rem;
    background: #fdfdfd;
    border-radius: var(--border-radius);
    text-align: center;
    border: 2px dashed #eee;
    margin: 2rem 0;
    transition: all 0.3s ease;
}

.scrambled-word {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: 12px;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    text-transform: uppercase;
    text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.05);
}

.typing-word {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--secondary-color);
    margin: 2rem 0;
    min-height: 5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    text-shadow: 2px 2px 0 rgba(0, 0, 0, 0.05);
}

.game-hint {
    color: #666;
    font-style: italic;
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.game-input {
    width: 100%;
    max-width: 450px;
    padding: 1.2rem;
    border: 2px solid #ddd;
    border-radius: 12px;
    font-size: 1.4rem;
    text-align: center;
    outline: none;
    transition: all 0.3s;
    background: white;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.game-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(0, 75, 141, 0.1);
}

.game-input:disabled {
    background: #f1f3f5;
    cursor: not-allowed;
    opacity: 0.7;
}

.typing-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    font-weight: 800;
    color: var(--primary-color);
    font-size: 1.3rem;
    margin-bottom: 1rem;
    background: rgba(0, 75, 141, 0.05);
    padding: 10px 20px;
    border-radius: 30px;
    display: inline-flex;
}

/* Footer & Logos */
.app-footer {
    background: #fdfdfd;
    padding: 3rem 1.5rem;
    text-align: center;
    border-top: 1px solid #eee;
    margin-top: 4rem;
}

.footer-logo-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.footer-logo {
    max-height: 45px;
    width: auto;
    object-fit: contain;
    filter: grayscale(1) brightness(0);
    opacity: 0.8;
    transition: all 0.3s ease;
}

.footer-logo.main-logo {
    max-height: 80px;
    opacity: 1;
}

.footer-logo.innovar-logo {
    max-height: 65px;
    opacity: 1;
}

.footer-logo.research-logo {
    max-height: 60px;
    opacity: 1;
    filter: invert(1); /* Fondo blanco, letras negras */
}

    .footer-logo-container {
        gap: 1.5rem;
    }

    .footer-logo {
        max-height: 35px;
    }

    .footer-logo.main-logo {
        max-height: 50px;
    }

    .footer-logo.innovar-logo {
        max-height: 45px;
    }

    .nav-btn {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }

    .hangman-container {
        flex-direction: column;
    }
}