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

:root {
    --color-primary: #1a5f3a;
    --color-primary-dark: #0f3d25;
    --color-primary-light: #2d7a51;
    --color-secondary: #f4a460;
    --color-accent: #ffd700;
    --color-bg: #f0f4f1;
    --color-white: #ffffff;
    --color-text: #2c3e2e;
    --color-text-light: #5a6c5b;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #0a1f0e 0%, #1a3a1a 50%, #0f2818 100%);
    min-height: 100vh;
    color: var(--color-text);
    position: relative;
    overflow-x: hidden;
}

/* Partículas de fondo animadas */
.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    font-family: 'Courier New', monospace;
    font-weight: 700;
    color: rgba(45, 122, 81, 0.4);
    font-size: 1.5rem;
    animation: float 20s infinite ease-in-out;
}

/* Estilos para la nueva página principal */
.main-hero {
    position: relative;
    z-index: 10;
    text-align: center;
    padding: 60px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.algebra-icon {
    margin: 0 auto 40px;
    text-align: center;
}

.algebra-icon i {
    font-size: 8rem;
    color: #ffd700;
    text-shadow: 0 0 30px rgba(255, 215, 0, 0.6);
    display: inline-block;
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        text-shadow: 0 0 30px rgba(255, 215, 0, 0.6);
    }
    50% {
        transform: scale(1.05);
        text-shadow: 0 0 50px rgba(255, 215, 0, 0.8);
    }
}

.main-title-new {
    font-size: 3.5rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 20px;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

.subtitle-new {
    font-size: 1.8rem;
    color: #ffd700;
    margin-bottom: 30px;
    font-weight: 400;
}

.description-main {
    font-size: 1.1rem;
    color: #ffd700;
    max-width: 700px;
    margin: 0 auto 50px;
    line-height: 1.6;
    opacity: 0.9;
}

.menu-buttons-main {
    display: flex;
    gap: 25px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 80px;
}

.menu-btn-main {
    background: linear-gradient(135deg, #1a5f3a, #0f3d24);
    color: white;
    padding: 18px 40px;
    border: 2px solid rgba(45, 122, 81, 0.5);
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.4s ease;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.menu-btn-main:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(45, 122, 81, 0.6);
    background: linear-gradient(135deg, #2d7a51, #1a5f3a);
    border-color: #7FFF7F;
}

.menu-btn-main i {
    font-size: 1.4rem;
}

.stats-container {
    display: flex;
    gap: 50px;
    justify-content: center;
    flex-wrap: wrap;
    padding-top: 40px;
    border-top: 1px solid rgba(45, 122, 81, 0.3);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: #ffd700;
    display: block;
    margin-bottom: 8px;
}

.stat-label {
    font-size: 1rem;
    color: #ffd700;
    opacity: 0.8;
}

/* Fin estilos página principal */


.particle:nth-child(1) { left: 10%; top: 20%; animation-delay: 0s; animation-duration: 15s; }
.particle:nth-child(2) { left: 20%; top: 80%; animation-delay: 2s; animation-duration: 18s; }
.particle:nth-child(3) { left: 30%; top: 40%; animation-delay: 4s; animation-duration: 22s; }
.particle:nth-child(4) { left: 40%; top: 70%; animation-delay: 1s; animation-duration: 16s; }
.particle:nth-child(5) { left: 50%; top: 30%; animation-delay: 3s; animation-duration: 20s; }
.particle:nth-child(6) { left: 60%; top: 60%; animation-delay: 5s; animation-duration: 19s; }
.particle:nth-child(7) { left: 70%; top: 25%; animation-delay: 2.5s; animation-duration: 17s; }
.particle:nth-child(8) { left: 80%; top: 75%; animation-delay: 4.5s; animation-duration: 21s; }
.particle:nth-child(9) { left: 90%; top: 45%; animation-delay: 1.5s; animation-duration: 23s; }
.particle:nth-child(10) { left: 15%; top: 55%; animation-delay: 3.5s; animation-duration: 18s; }
.particle:nth-child(11) { left: 25%; top: 15%; animation-delay: 0.5s; animation-duration: 19s; }
.particle:nth-child(12) { left: 75%; top: 85%; animation-delay: 2.8s; animation-duration: 20s; }
.particle:nth-child(13) { left: 85%; top: 10%; animation-delay: 4.2s; animation-duration: 22s; }
.particle:nth-child(14) { left: 5%; top: 90%; animation-delay: 1.8s; animation-duration: 16s; }
.particle:nth-child(15) { left: 95%; top: 95%; animation-delay: 3.2s; animation-duration: 24s; }

@keyframes float {
    0%, 100% {
        transform: translateY(0) translateX(0) rotate(0deg);
        opacity: 0.3;
    }
    25% {
        transform: translateY(-30px) translateX(20px) rotate(90deg);
        opacity: 0.5;
    }
    50% {
        transform: translateY(-60px) translateX(-20px) rotate(180deg);
        opacity: 0.3;
    }
    75% {
        transform: translateY(-30px) translateX(30px) rotate(270deg);
        opacity: 0.4;
    }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    position: relative;
    z-index: 1;
}

.container-main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* Círculo decorativo con variables */
.math-circle {
    position: relative;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: radial-gradient(circle, rgba(138, 43, 226, 0.3) 0%, rgba(75, 0, 130, 0.5) 50%, rgba(25, 25, 112, 0.7) 100%);
    box-shadow: 0 0 80px rgba(138, 43, 226, 0.6), inset 0 0 60px rgba(138, 43, 226, 0.4);
    margin-bottom: 40px;
    animation: pulse-circle 3s ease-in-out infinite;
}

@keyframes pulse-circle {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 80px rgba(138, 43, 226, 0.6), inset 0 0 60px rgba(138, 43, 226, 0.4);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 100px rgba(138, 43, 226, 0.8), inset 0 0 80px rgba(138, 43, 226, 0.6);
    }
}

.circle-variables {
    position: relative;
    width: 100%;
    height: 100%;
}

.var {
    position: absolute;
    font-family: 'Courier New', monospace;
    font-weight: 700;
    font-size: 1.8rem;
    color: var(--color-accent);
    text-shadow: 0 0 10px rgba(255, 215, 0, 0.8);
    animation: orbit 8s linear infinite;
}

.var-1 { left: 50%; top: 10%; transform: translateX(-50%); animation-delay: 0s; }
.var-2 { right: 15%; top: 25%; animation-delay: 1.3s; }
.var-3 { right: 5%; top: 50%; transform: translateY(-50%); animation-delay: 2.6s; }
.var-4 { right: 15%; bottom: 25%; animation-delay: 3.9s; }
.var-5 { left: 50%; bottom: 10%; transform: translateX(-50%); animation-delay: 5.2s; }
.var-6 { left: 15%; bottom: 25%; animation-delay: 6.5s; }

@keyframes orbit {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.2);
        opacity: 0.8;
    }
}

/* Header principal nuevo */
.header-section-main {
    text-align: center;
    margin-bottom: 50px;
}

.main-title-new {
    font-size: 4rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 15px;
    text-shadow: 0 4px 20px rgba(255, 255, 255, 0.3);
    animation: glow-title 2s ease-in-out infinite;
}

@keyframes glow-title {
    0%, 100% {
        filter: drop-shadow(0 0 20px rgba(155, 89, 182, 0.5));
    }
    50% {
        filter: drop-shadow(0 0 40px rgba(155, 89, 182, 0.8));
    }
}

.subtitle-new {
    font-size: 1.8rem;
    color: #ffd700;
    font-weight: 400;
    margin-bottom: 10px;
}

.description-main {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.7);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.6;
}

/* Botones del menú principal */
.menu-buttons-main {
    display: flex;
    gap: 20px;
    margin-bottom: 60px;
    flex-wrap: wrap;
    justify-content: center;
}

.menu-btn-main {
    padding: 18px 40px;
    font-size: 1.2rem;
    font-weight: 600;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    gap: 12px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
}

.menu-btn-main.primary {
    background: linear-gradient(135deg, #ffd700 0%, #f4a460 100%);
    color: #0f3d24;
}

.menu-btn-main.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.6);
    background: linear-gradient(135deg, #ffed4e 0%, #ffd700 100%);
}

.menu-btn-main.secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--color-white);
    border: 2px solid rgba(255, 215, 0, 0.5);
}

.menu-btn-main.secondary:hover {
    background: rgba(255, 215, 0, 0.2);
    border-color: #ffd700;
    transform: translateY(-3px);
}

.menu-btn-main i {
    font-size: 1.4rem;
}

/* Estadísticas */
.stats-container {
    display: flex;
    gap: 60px;
    justify-content: center;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    color: #ffd700;
    margin-bottom: 5px;
    text-shadow: 0 0 20px rgba(255, 215, 0, 0.6);
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    letter-spacing: 2px;
    font-weight: 600;
}

/* Pantallas */
.screen {
    display: none;
    animation: fadeIn 0.5s ease;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ===== ESTILOS SECCIÓN JUEGO ===== */
.game-header {
    text-align: center;
    padding: 40px 20px;
    margin-bottom: 40px;
}

.game-header i {
    font-size: 4rem;
    color: #ffd700;
    margin-bottom: 20px;
}

.game-header h2 {
    font-size: 3rem;
    color: #ffffff;
    margin-bottom: 10px;
}

.game-subtitle {
    font-size: 1.2rem;
    color: #ffd700;
    opacity: 0.9;
}

/* Selector de Fases */
.phase-selector {
    display: flex;
    gap: 30px;
    justify-content: center;
    flex-wrap: wrap;
    padding: 40px 20px;
}

.phase-card {
    background: linear-gradient(135deg, #1a5f3a, #0f3d24);
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 20px;
    padding: 40px 30px;
    width: 250px;
    text-align: center;
    cursor: pointer;
    transition: all 0.4s ease;
}

.phase-card i {
    font-size: 3rem;
    color: #ffd700;
    margin-bottom: 20px;
}

.phase-card h3 {
    font-size: 1.8rem;
    color: #ffffff;
    margin-bottom: 10px;
}

.phase-card p {
    font-size: 1.1rem;
    color: #ffd700;
    opacity: 0.8;
}

.phase-card:hover:not(.locked) {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(255, 215, 0, 0.5);
    border-color: #ffd700;
}

.phase-card.locked {
    opacity: 0.5;
    cursor: not-allowed;
}

.phase-card.locked i {
    color: #666;
}

/* Área del Juego */
.game-area {
    max-width: 900px;
    margin: 0 auto;
}

.game-info {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 20px;
    background: rgba(26, 95, 58, 0.3);
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 15px;
    padding: 20px;
    margin-bottom: 30px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 10px;
    color: #ffffff;
    font-size: 1.1rem;
}

.info-item i {
    color: #ffd700;
    font-size: 1.3rem;
}

/* Tarjeta de Pregunta */
.question-card {
    background: linear-gradient(135deg, #1a5f3a, #0f3d24);
    border: 3px solid rgba(255, 215, 0, 0.5);
    border-radius: 20px;
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

.question-text {
    font-size: 1.5rem;
    color: #ffd700;
    margin-bottom: 20px;
    text-align: center;
}

.expression-display {
    font-size: 3rem;
    font-weight: 700;
    color: #ffffff;
    text-align: center;
    padding: 30px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 15px;
    margin-bottom: 30px;
    font-family: 'Courier New', monospace;
}

/* Opciones de Respuesta */
.options-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.option-btn {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 215, 0, 0.3);
    border-radius: 15px;
    padding: 20px;
    font-size: 1.3rem;
    color: #ffffff;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
}

.option-btn:hover:not(:disabled) {
    background: rgba(255, 215, 0, 0.2);
    border-color: #ffd700;
    transform: translateY(-3px);
}

.option-btn:disabled {
    cursor: not-allowed;
}

.option-btn.correct {
    background: linear-gradient(135deg, #27ae60, #229954);
    border-color: #27ae60;
    animation: pulse 0.5s ease;
}

.option-btn.incorrect {
    background: linear-gradient(135deg, #e74c3c, #c0392b);
    border-color: #e74c3c;
    animation: shake 0.5s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* Caja de explicación */
.explanation-box {
    background: linear-gradient(135deg, #2c5f4a, #1a4d3a);
    border: 3px solid #ffd700;
    border-radius: 20px;
    padding: 25px;
    margin-top: 30px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    box-shadow: 0 8px 30px rgba(255, 215, 0, 0.3);
    animation: slideDown 0.5s ease;
}

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

.explanation-icon {
    background: linear-gradient(135deg, #ffd700, #f4a460);
    color: #0f3d24;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.4);
}

.explanation-icon i {
    font-size: 1.8rem;
}

.explanation-content {
    flex: 1;
    color: #ffffff;
}

.explanation-content h4 {
    color: #ffd700;
    font-size: 1.3rem;
    margin: 0 0 12px 0;
    font-weight: 700;
}

.explanation-content p {
    color: #e0e0e0;
    font-size: 1.1rem;
    line-height: 1.7;
    margin: 0;
}

/* Botón Siguiente */
.next-btn {
    background: linear-gradient(135deg, #ffd700, #f4a460);
    color: #0f3d24;
    border: none;
    border-radius: 50px;
    padding: 18px 40px;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 0 auto;
    transition: all 0.3s ease;
    text-transform: uppercase;
}

.next-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.5);
}

/* Pantalla de Resultados */
.results-screen {
    text-align: center;
    padding: 40px 20px;
}

.results-icon {
    font-size: 5rem;
    color: #ffd700;
    margin-bottom: 30px;
    animation: bounce 1s ease infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.results-screen h2 {
    font-size: 2.5rem;
    color: #ffffff;
    margin-bottom: 40px;
}

.score-display {
    margin-bottom: 30px;
}

.score-circle {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    background: linear-gradient(135deg, #1a5f3a, #0f3d24);
    border: 5px solid #ffd700;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    box-shadow: 0 0 40px rgba(255, 215, 0, 0.5);
}

.score-number {
    font-size: 4rem;
    font-weight: 700;
    color: #ffd700;
}

.score-total {
    font-size: 2rem;
    color: #ffffff;
}

.score-percentage {
    font-size: 1.5rem;
    color: #ffd700;
    font-weight: 600;
}

.time-display {
    display: none;
    font-size: 1.3rem;
    color: #ffffff;
    margin-bottom: 40px;
}

.time-display i {
    color: #ffd700;
    margin-right: 10px;
}

.results-buttons {
    display: flex;
    gap: 20px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn-primary, .btn-secondary {
    padding: 18px 40px;
    border: none;
    border-radius: 50px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 10px;
    transition: all 0.3s ease;
    text-transform: uppercase;
}

.btn-primary {
    background: linear-gradient(135deg, #ffd700, #f4a460);
    color: #0f3d24;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(255, 215, 0, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border: 2px solid rgba(255, 215, 0, 0.5);
}

.btn-secondary:hover {
    background: rgba(255, 215, 0, 0.2);
    border-color: #ffd700;
    transform: translateY(-3px);
}

.btn-phase {
    background: linear-gradient(135deg, #1a5f3a 0%, #0f3d24 100%);
    color: #ffd700;
    border: 2px solid #ffd700;
    padding: 12px 25px;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(255, 215, 0, 0.2);
}

.btn-phase:hover {
    background: linear-gradient(135deg, #0f3d24 0%, #1a5f3a 100%);
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 215, 0, 0.4);
}

.btn-phase:active {
    transform: translateY(-1px);
}

.phase-selection-buttons {
    animation: fadeInUp 0.5s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive para juego */
@media (max-width: 768px) {
    .phase-card {
        width: 100%;
        max-width: 300px;
    }
    
    .options-container {
        grid-template-columns: 1fr;
    }
    
    .expression-display {
        font-size: 2rem;
        padding: 20px;
    }
    
    .results-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn-primary, .btn-secondary {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
}

/* Estilos anteriores del header (para sección aprender) */
.header-section {
    text-align: center;
    padding: 60px 20px;
    color: var(--color-white);
}

.icon-large {
    font-size: 80px;
    color: var(--color-accent);
    margin-bottom: 20px;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

.main-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    font-size: 1.3rem;
    color: var(--color-accent);
    font-weight: 400;
}

.menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 25px;
    max-width: 500px;
    margin: 0 auto;
    padding: 20px;
}

.menu-btn {
    background: linear-gradient(135deg, var(--color-white) 0%, #e8f5e9 100%);
    border: 3px solid var(--color-accent);
    padding: 25px 40px;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--color-primary);
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.menu-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
}

.menu-btn i {
    font-size: 1.8rem;
}

/* Botón de Volver */
.back-btn {
    background: var(--color-white);
    border: 2px solid var(--color-accent);
    padding: 12px 25px;
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-primary);
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    margin-bottom: 20px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.back-btn:hover {
    background: var(--color-accent);
    color: var(--color-white);
    transform: translateX(-5px);
}

/* Sección Aprender */
.learn-header {
    text-align: center;
    background: linear-gradient(135deg, var(--color-white) 0%, #e8f5e9 100%);
    padding: 40px 20px;
    border-radius: 20px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-lg);
}

.learn-header i {
    font-size: 60px;
    color: var(--color-accent);
    margin-bottom: 15px;
}

.learn-header h2 {
    font-size: 2.5rem;
    color: var(--color-primary);
    font-weight: 700;
}

.learn-content {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

/* Menú de Navegación Rápida */
.quick-nav-menu {
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
    border-radius: 20px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-lg);
    border: 3px solid var(--color-accent);
}

.quick-nav-header {
    text-align: center;
    color: var(--color-white);
    margin-bottom: 25px;
}

.quick-nav-header i {
    font-size: 3rem;
    color: var(--color-accent);
    margin-bottom: 15px;
}

.quick-nav-header h3 {
    font-size: 2rem;
    margin-bottom: 10px;
    font-weight: 700;
}

.quick-nav-header p {
    font-size: 1.1rem;
    color: var(--color-accent);
    margin: 0;
}

.nav-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.nav-btn {
    background: linear-gradient(135deg, var(--color-white) 0%, #f0f4f1 100%);
    border: 3px solid var(--color-accent);
    padding: 20px;
    border-radius: 15px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--color-primary);
}

.nav-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
}

.nav-btn i {
    font-size: 1.5rem;
    color: var(--color-primary);
    transition: all 0.3s ease;
}

.nav-btn:hover i {
    color: var(--color-white);
    transform: scale(1.2);
}

.learn-content {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

/* Tarjetas de Lección */
.lesson-card {
    background: var(--color-white);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
}

.lesson-card:hover {
    transform: translateY(-5px);
}

.lesson-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    padding: 20px 30px;
    display: flex;
    align-items: center;
    gap: 15px;
    color: var(--color-white);
}

.lesson-header i {
    font-size: 2rem;
    color: var(--color-accent);
}

.lesson-header h3 {
    font-size: 1.8rem;
    font-weight: 600;
}

.lesson-body {
    padding: 30px;
    line-height: 1.8;
    font-size: 1.1rem;
    color: var(--color-text);
}

.lesson-body p {
    margin-bottom: 20px;
}

.lesson-body strong {
    color: var(--color-primary);
}

/* Cajas de Ejemplo */
.example-box {
    background: linear-gradient(135deg, #fff9e6 0%, #fffbf0 100%);
    border-left: 5px solid var(--color-accent);
    padding: 25px;
    border-radius: 12px;
    margin: 20px 0;
    box-shadow: var(--shadow);
}

.example-title {
    font-weight: 600;
    color: var(--color-primary);
    font-size: 1.2rem;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.example-title i {
    color: var(--color-accent);
}

.info-box {
    background: linear-gradient(135deg, #e8f5e9 0%, #f1f8f4 100%);
    border-left: 5px solid var(--color-primary);
    padding: 25px;
    border-radius: 12px;
    margin: 20px 0;
    box-shadow: var(--shadow);
}

/* Fórmulas y Destacados */
.highlight {
    background: var(--color-accent);
    color: var(--color-primary-dark);
    padding: 3px 10px;
    border-radius: 5px;
    font-weight: 600;
}

.formula {
    background: var(--color-primary-dark);
    color: var(--color-accent);
    padding: 5px 12px;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-weight: 600;
    font-size: 1.1rem;
    display: inline-block;
    margin: 3px;
}

.formula-large {
    background: var(--color-primary-dark);
    color: var(--color-accent);
    padding: 15px 25px;
    border-radius: 12px;
    font-family: 'Courier New', monospace;
    font-weight: 700;
    font-size: 1.8rem;
    text-align: center;
    margin: 20px 0;
    box-shadow: var(--shadow);
}

/* Tabla de Traducción */
.translation-table {
    background: var(--color-white);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow);
    margin: 20px 0;
}

.translation-header {
    background: var(--color-primary);
    color: var(--color-white);
    padding: 15px 20px;
    display: grid;
    grid-template-columns: 2fr auto 2fr;
    gap: 15px;
    font-weight: 600;
    text-align: center;
}

.translation-header i {
    color: var(--color-accent);
}

.translation-row {
    display: grid;
    grid-template-columns: 2fr auto 2fr;
    gap: 15px;
    padding: 15px 20px;
    border-bottom: 1px solid #e0e0e0;
    align-items: center;
}

.translation-row:last-child {
    border-bottom: none;
}

.translation-row:nth-child(even) {
    background: #f9f9f9;
}

.translation-row span:first-child {
    text-align: left;
    padding-left: 10px;
}

.translation-row span:last-child {
    text-align: center;
}

.translation-row i {
    color: var(--color-primary);
    text-align: center;
}

/* Partes de la Expresión */
.parts-example {
    margin-top: 20px;
}

.parts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin-top: 20px;
}

.part {
    background: var(--color-white);
    padding: 15px;
    border-radius: 10px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 10px;
}

.part i {
    color: var(--color-accent);
    font-size: 0.8rem;
}

/* Lista de Ejemplos */
.examples-list {
    list-style: none;
    padding: 0;
}

.examples-list li {
    padding: 12px 0;
    border-bottom: 1px dashed #ddd;
}

.examples-list li:last-child {
    border-bottom: none;
}

/* Tipos de Expresiones Algebraicas */
.types-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 25px;
    margin: 25px 0;
}

.type-card {
    background: var(--color-white);
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
}

.type-card:hover {
    transform: translateY(-8px) scale(1.02);
}

.type-card-emphasis {
    border: 4px solid var(--color-accent);
    box-shadow: 0 15px 40px rgba(123, 31, 162, 0.3);
}

.type-card-emphasis:hover {
    transform: translateY(-10px) scale(1.03);
    box-shadow: 0 20px 50px rgba(123, 31, 162, 0.4);
}

.type-header {
    padding: 20px;
    color: var(--color-white);
    text-align: center;
    position: relative;
}

.type-header.mono {
    background: linear-gradient(135deg, #2e7d32 0%, #43a047 100%);
}

.type-header.bi {
    background: linear-gradient(135deg, #1976d2 0%, #42a5f5 100%);
}

.type-header.tri {
    background: linear-gradient(135deg, #f57c00 0%, #fb8c00 100%);
}

.type-header.poli {
    background: linear-gradient(135deg, #7b1fa2 0%, #9c27b0 100%);
}

.type-header i {
    font-size: 2.5rem;
    margin-bottom: 10px;
    opacity: 0.9;
}

.type-header h4 {
    font-size: 1.5rem;
    margin: 10px 0;
    font-weight: 700;
}

.badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.3);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-top: 5px;
}

.type-body {
    padding: 20px;
}

.type-body p {
    margin-bottom: 15px;
    color: var(--color-text);
}

.examples-mini {
    background: #f5f5f5;
    padding: 15px;
    border-radius: 10px;
    margin: 15px 0;
}

.examples-mini p {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 10px;
}

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

.examples-mini li {
    padding: 5px 0;
    font-size: 1.05rem;
}

.inciso {
    font-weight: 700;
    color: var(--color-primary);
    margin-right: 8px;
    font-size: 1.1rem;
}

.life-example {
    background: linear-gradient(135deg, #fff9e6 0%, #fffbf0 100%);
    border-left: 4px solid var(--color-accent);
    padding: 12px 15px;
    border-radius: 8px;
    margin-top: 15px;
    display: flex;
    align-items: start;
    gap: 10px;
}

.life-example i {
    color: var(--color-accent);
    font-size: 1.2rem;
    margin-top: 2px;
}

.life-example p {
    margin: 0;
    font-size: 0.95rem;
}

.life-example p {
    margin: 0;
    font-size: 0.95rem;
}

/* Nota Importante Destacada */
.important-note {
    background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
    border: 4px solid #ff9800;
    border-radius: 15px;
    padding: 25px;
    margin-top: 30px;
    box-shadow: 0 8px 25px rgba(255, 152, 0, 0.3);
    display: flex;
    gap: 20px;
    align-items: start;
}

.note-icon {
    flex-shrink: 0;
}

.note-icon i {
    font-size: 3rem;
    color: #f57c00;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.note-content {
    flex: 1;
}

.note-content h4 {
    color: #e65100;
    font-size: 1.4rem;
    margin-bottom: 15px;
    font-weight: 700;
}

.note-content p {
    margin: 12px 0;
    color: var(--color-text);
    font-size: 1.05rem;
    line-height: 1.6;
}

.note-content ul {
    list-style: none;
    padding-left: 0;
    margin: 15px 0;
}

.note-content li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
    font-size: 1.05rem;
}

.note-content li:before {
    content: "▶";
    position: absolute;
    left: 0;
    color: #f57c00;
    font-weight: bold;
}

.highlight-text {
    background: linear-gradient(135deg, #fff9c4 0%, #ffecb3 100%);
    padding: 12px 15px;
    border-radius: 8px;
    border-left: 4px solid #ffa726;
    font-weight: 600;
    margin-top: 15px;
}

/* Problemas de la Vida Real */
.real-problem {
    background: linear-gradient(135deg, #f8f9fa 0%, #ffffff 100%);
    border: 3px solid var(--color-primary-light);
    border-radius: 15px;
    padding: 25px;
    margin: 25px 0;
    box-shadow: var(--shadow);
}

.problem-title {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--color-accent);
}

.problem-title i {
    font-size: 1.8rem;
    color: var(--color-primary);
}

.problem-title h4 {
    font-size: 1.4rem;
    color: var(--color-primary);
    font-weight: 700;
    margin: 0;
}

.problem-content {
    display: grid;
    gap: 25px;
}

.problem-text {
    background: var(--color-white);
    padding: 20px;
    border-radius: 10px;
    border-left: 4px solid var(--color-primary);
}

.problem-text p {
    font-weight: 600;
    color: var(--color-primary);
    margin-bottom: 12px;
}

.problem-text ul {
    list-style: none;
    padding-left: 0;
}

.problem-text li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
}

.problem-text li:before {
    content: "▸";
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}

.problem-table {
    overflow-x: auto;
}

.problem-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.problem-table thead {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: var(--color-white);
}

.problem-table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    font-size: 1.1rem;
}

.problem-table th i {
    margin-right: 8px;
    color: var(--color-accent);
}

.problem-table tbody tr {
    border-bottom: 1px solid #e0e0e0;
    transition: background 0.3s ease;
}

.problem-table tbody tr:hover {
    background: #f5f5f5;
}

.problem-table tbody tr:last-child {
    border-bottom: none;
}

.problem-table td {
    padding: 15px;
    font-size: 1.1rem;
}

.problem-table td:first-child {
    font-weight: 600;
    color: var(--color-text);
}

.problem-table td:first-child {
    font-weight: 600;
    color: var(--color-text);
}

.problem-table td i {
    margin-right: 8px;
    color: var(--color-primary);
}

/* Sección de Explicaciones */
.explanation-section {
    background: linear-gradient(135deg, #f1f8f4 0%, #e8f5e9 100%);
    border: 3px solid var(--color-primary);
    border-radius: 15px;
    padding: 25px;
    margin-top: 25px;
}

.explanation-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 25px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--color-accent);
}

.explanation-header i {
    font-size: 2rem;
    color: var(--color-primary);
}

.explanation-header h5 {
    font-size: 1.5rem;
    color: var(--color-primary);
    font-weight: 700;
    margin: 0;
}

.explanation-item {
    background: var(--color-white);
    border-left: 5px solid var(--color-primary);
    border-radius: 12px;
    padding: 20px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.explanation-item:last-child {
    margin-bottom: 0;
}

.explanation-title {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: var(--color-primary);
    font-size: 1.2rem;
}

.explanation-title i {
    font-size: 1.5rem;
    color: var(--color-accent);
}

.explanation-content p {
    margin: 10px 0;
    padding-left: 15px;
    line-height: 1.6;
}

.explanation-content p i {
    margin-right: 8px;
}

.formula-box {
    background: var(--color-primary-dark);
    color: var(--color-accent);
    padding: 15px 25px;
    border-radius: 10px;
    font-family: 'Courier New', monospace;
    font-weight: 700;
    font-size: 1.6rem;
    text-align: center;
    margin: 15px 0;
    box-shadow: var(--shadow);
    border: 2px solid var(--color-accent);
}

/* Caja de Desafío */
.challenge-box {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    border: 3px solid #4caf50;
    border-radius: 15px;
    padding: 25px;
    margin-top: 30px;
    box-shadow: var(--shadow-lg);
}

.challenge-box i {
    font-size: 2rem;
    color: #2e7d32;
    margin-bottom: 10px;
}

.challenge-box h4 {
    color: #1b5e20;
    font-size: 1.5rem;
    margin-bottom: 15px;
}

.challenge-box p {
    margin: 10px 0;
    color: var(--color-text);
}

.challenge-box ul {
    list-style: none;
    padding-left: 0;
    margin: 15px 0;
}

.challenge-box li {
    padding: 8px 0;
    padding-left: 25px;
    position: relative;
}

.challenge-box li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: #2e7d32;
    font-weight: bold;
    font-size: 1.2rem;
}

/* Comparación de Términos */
.comparison-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
    margin: 20px 0;
}

.comparison-card {
    padding: 25px;
    border-radius: 12px;
    box-shadow: var(--shadow);
}

.comparison-card.yes {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
    border: 3px solid #4caf50;
}

.comparison-card.no {
    background: linear-gradient(135deg, #ffebee 0%, #ffcdd2 100%);
    border: 3px solid #f44336;
}

.comparison-card i {
    font-size: 2rem;
    margin-bottom: 10px;
}

.comparison-card.yes i {
    color: #4caf50;
}

.comparison-card.no i {
    color: #f44336;
}

.comparison-card h4 {
    margin-bottom: 15px;
    font-size: 1.3rem;
}

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

.comparison-card li {
    padding: 8px 0;
    font-size: 1.1rem;
}

/* Pasos */
.step-by-step {
    margin-top: 20px;
}

.step {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 15px;
    margin: 10px 0;
    background: var(--color-white);
    border-radius: 10px;
    box-shadow: var(--shadow);
}

.step-number {
    background: var(--color-primary);
    color: var(--color-accent);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
    flex-shrink: 0;
}

.step-content {
    flex: 1;
    font-size: 1.1rem;
}

/* Ejercicios de Práctica */
.practice-exercises {
    display: flex;
    flex-direction: column;
    gap: 20px;
    margin-top: 20px;
}

.exercise {
    background: linear-gradient(135deg, #f5f5f5 0%, #ffffff 100%);
    border: 2px solid var(--color-primary-light);
    border-radius: 12px;
    padding: 20px;
    display: flex;
    gap: 20px;
    align-items: flex-start;
    box-shadow: var(--shadow);
}

.exercise-number {
    background: var(--color-primary);
    color: var(--color-accent);
    width: 45px;
    height: 45px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.4rem;
    flex-shrink: 0;
}

.exercise-content {
    flex: 1;
}

.exercise-content p {
    font-size: 1.2rem;
    margin-bottom: 15px;
    color: var(--color-text);
}

.answer-reveal {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.reveal-btn {
    background: var(--color-primary);
    color: var(--color-white);
    border: none;
    padding: 10px 20px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    align-self: flex-start;
}

.reveal-btn:hover {
    background: var(--color-primary-light);
    transform: scale(1.05);
}

.answer {
    display: none;
    background: var(--color-primary-dark);
    padding: 15px 20px;
    border-radius: 8px;
    margin-top: 10px;
    animation: slideDown 0.3s ease;
}

.answer.show {
    display: block;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Caja de Motivación */
.motivation-box {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-secondary) 100%);
    color: var(--color-white);
    padding: 25px;
    border-radius: 12px;
    text-align: center;
    margin-top: 30px;
    box-shadow: var(--shadow-lg);
}

.motivation-box i {
    font-size: 2rem;
    margin-bottom: 10px;
}

.motivation-box p {
    font-size: 1.2rem;
    font-weight: 600;
    margin: 0;
}

/* Tips y Trucos */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.tip-card {
    background: linear-gradient(135deg, #fff9e6 0%, #fffbf0 100%);
    border: 2px solid var(--color-accent);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.tip-card:hover {
    transform: translateY(-5px);
}

.tip-card i {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 10px;
}

.tip-card h4 {
    color: var(--color-primary);
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.tip-card p {
    margin: 0;
    font-size: 1rem;
}

/* Tips y Trucos */
.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-top: 20px;
}

.tip-card {
    background: linear-gradient(135deg, #fff9e6 0%, #fffbf0 100%);
    border: 2px solid var(--color-accent);
    border-radius: 12px;
    padding: 20px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.tip-card:hover {
    transform: translateY(-5px);
}

.tip-card i {
    font-size: 2rem;
    color: var(--color-primary);
    margin-bottom: 10px;
}

.tip-card h4 {
    color: var(--color-primary);
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.tip-card p {
    margin: 0;
    font-size: 1rem;
}

/* Actividad Práctica - Frutas */
.practice-problem {
    background: linear-gradient(135deg, #f0f8ff 0%, #e6f3ff 100%);
    border: 3px solid #2196f3;
    border-radius: 15px;
    padding: 25px;
    margin-top: 20px;
    box-shadow: var(--shadow-lg);
}

.practice-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 3px solid var(--color-accent);
}

.practice-header i {
    font-size: 2rem;
    color: #2196f3;
}

.practice-header h4 {
    font-size: 1.5rem;
    color: #1976d2;
    font-weight: 700;
    margin: 0;
}

.practice-content {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.practice-table {
    overflow-x: auto;
}

.practice-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-white);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.practice-table thead {
    background: linear-gradient(135deg, #1976d2 0%, #2196f3 100%);
    color: var(--color-white);
}

.practice-table th {
    padding: 15px;
    text-align: center;
    font-weight: 600;
    font-size: 1.1rem;
}

.practice-table th i {
    margin-right: 8px;
    color: var(--color-accent);
}

.practice-table tbody tr {
    border-bottom: 1px solid #e0e0e0;
    transition: background 0.3s ease;
}

.practice-table tbody tr:hover {
    background: #f5f5f5;
}

.practice-table tbody tr:last-child {
    border-bottom: none;
}

.practice-table td {
    padding: 15px;
    text-align: center;
    font-size: 1.1rem;
}

.practice-table td:first-child {
    font-weight: 600;
    color: var(--color-text);
}

.practice-table td i {
    margin-right: 8px;
    color: var(--color-primary);
}

.answer-container {
    min-height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.answer-hidden {
    font-size: 1.5rem;
    color: #999;
    font-weight: 700;
}

.answer-shown {
    animation: fadeIn 0.5s ease;
}

.eye-btn {
    background: linear-gradient(135deg, #2196f3 0%, #42a5f5 100%);
    border: none;
    color: var(--color-white);
    padding: 10px 15px;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.eye-btn:hover {
    background: linear-gradient(135deg, #1976d2 0%, #2196f3 100%);
    transform: scale(1.1);
}

.eye-btn i {
    transition: all 0.3s ease;
}

.practice-tip {
    background: linear-gradient(135deg, #fff9e6 0%, #fffbf0 100%);
    border-left: 5px solid var(--color-accent);
    padding: 15px 20px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.practice-tip i {
    font-size: 1.5rem;
    color: var(--color-accent);
}

.practice-tip p {
    margin: 0;
    font-size: 1.05rem;
    color: var(--color-text);
}

.practice-tip i.fa-eye {
    font-size: 1rem;
}

.practice-tip i.fa-eye {
    font-size: 1rem;
}

/* Mensaje Final Motivador */
.final-message {
    background: linear-gradient(135deg, #1a5f3a 0%, #2d7a51 100%);
    border: 5px solid var(--color-accent);
    border-radius: 25px;
    padding: 50px 30px;
    text-align: center;
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
    margin-top: 40px;
    position: relative;
    overflow: hidden;
}

.final-message::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255, 215, 0, 0.1) 0%, transparent 70%);
    animation: pulse-bg 3s ease-in-out infinite;
}

@keyframes pulse-bg {
    0%, 100% {
        transform: scale(1);
        opacity: 0.5;
    }
    50% {
        transform: scale(1.1);
        opacity: 0.8;
    }
}

.final-icon {
    position: relative;
    z-index: 1;
}

.final-icon i {
    font-size: 5rem;
    color: var(--color-accent);
    animation: rocket-launch 2s ease-in-out infinite;
}

@keyframes rocket-launch {
    0%, 100% {
        transform: translateY(0) rotate(-45deg);
    }
    50% {
        transform: translateY(-20px) rotate(-45deg);
    }
}

.final-message h2 {
    color: var(--color-white);
    font-size: 2.5rem;
    margin: 20px 0;
    font-weight: 700;
    position: relative;
    z-index: 1;
}

.final-message p {
    color: var(--color-accent);
    font-size: 1.3rem;
    margin: 20px auto;
    max-width: 700px;
    line-height: 1.6;
    position: relative;
    z-index: 1;
}

.achievement-badges {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin: 30px 0;
    flex-wrap: wrap;
    position: relative;
    z-index: 1;
}

.badge-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: 15px;
    min-width: 150px;
    transition: all 0.3s ease;
}

.badge-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-5px);
}

.badge-item i {
    font-size: 2.5rem;
    color: #4caf50;
}

.badge-item span {
    color: var(--color-white);
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
}

.ready-btn {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-secondary) 100%);
    border: none;
    color: var(--color-primary-dark);
    padding: 20px 50px;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 10px 30px rgba(244, 164, 96, 0.5);
    display: inline-flex;
    align-items: center;
    gap: 15px;
    margin-top: 20px;
    position: relative;
    z-index: 1;
}

.ready-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 15px 40px rgba(244, 164, 96, 0.7);
    background: linear-gradient(135deg, #ffd700 0%, #ffb347 100%);
}

.ready-btn i {
    font-size: 1.8rem;
    animation: bounce 1s ease-in-out infinite;
}

/* Próximamente */
.coming-soon {
    text-align: center;
    padding: 100px 20px;
    color: var(--color-white);
}

.coming-soon i {
    font-size: 80px;
    color: var(--color-accent);
    margin-bottom: 30px;
}

.coming-soon h2 {
    font-size: 3rem;
    margin-bottom: 15px;
}

.coming-soon p {
    font-size: 1.5rem;
    color: var(--color-accent);
}

/* Responsive */
@media (max-width: 768px) {
    .particle {
        font-size: 1rem;
    }

    .algebra-icon i {
        font-size: 5rem;
    }

    .main-title-new {
        font-size: 2.5rem;
    }

    .subtitle-new {
        font-size: 1.1rem;
    }

    .description-main {
        font-size: 1rem;
    }

    .menu-buttons-main {
        flex-direction: column;
        width: 100%;
        max-width: 300px;
    }

    .menu-btn-main {
        width: 100%;
        justify-content: center;
    }

    .stats-container {
        gap: 30px;
    }

    .stat-number {
        font-size: 2rem;
    }

    .main-title {
        font-size: 2.5rem;
    }

    .subtitle {
        font-size: 1.1rem;
    }

    .menu-btn {
        padding: 20px 30px;
        font-size: 1.2rem;
    }

    .learn-header h2 {
        font-size: 2rem;
    }

    .lesson-header h3 {
        font-size: 1.4rem;
    }

    .lesson-body {
        padding: 20px;
        font-size: 1rem;
    }

    .types-row {
        grid-template-columns: 1fr;
    }

    .nav-buttons {
        grid-template-columns: 1fr;
    }

    .quick-nav-header h3 {
        font-size: 1.5rem;
    }

    .achievement-badges {
        flex-direction: column;
        gap: 15px;
    }

    .final-message h2 {
        font-size: 1.8rem;
    }

    .final-message p {
        font-size: 1.1rem;
    }

    .ready-btn {
        padding: 15px 30px;
        font-size: 1.2rem;
    }

    .problem-content {
        grid-template-columns: 1fr;
    }

    .translation-header,
    .translation-row {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .translation-header span:nth-child(2),
    .translation-row span:nth-child(2) {
        display: none;
    }

    .comparison-grid {
        grid-template-columns: 1fr;
    }

    .tips-grid {
        grid-template-columns: 1fr;
    }

    .practice-table {
        font-size: 0.9rem;
    }

    .practice-table th,
    .practice-table td {
        padding: 10px 5px;
        font-size: 0.95rem;
    }

    .eye-btn {
        padding: 8px 12px;
        font-size: 1rem;
    }

    .exercise {
        flex-direction: column;
    }

    .formula-large {
        font-size: 1.4rem;
    }
}

@media (max-width: 480px) {
    .main-title {
        font-size: 2rem;
    }

    .icon-large {
        font-size: 60px;
    }

    .menu-btn {
        padding: 18px 25px;
        font-size: 1.1rem;
    }

    .menu-btn i {
        font-size: 1.5rem;
    }

    .nav-buttons {
        grid-template-columns: 1fr;
    }

    .final-icon i {
        font-size: 3.5rem;
    }

    .important-note {
        flex-direction: column;
        text-align: center;
    }

    .note-icon i {
        font-size: 2.5rem;
    }
}

/* ===== ESTILOS PARA SISTEMA DE REGISTRO Y RANKING ===== */

/* Modal Base */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(5px);
    z-index: 10000;
    justify-content: center;
    align-items: center;
    padding: 20px;
    animation: fadeIn 0.3s ease;
}

.modal.show {
    display: flex;
}

.modal-content {
    background: linear-gradient(135deg, #ffffff 0%, #f8f9fa 100%);
    border-radius: 20px;
    padding: 2rem;
    max-width: 600px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.4s ease;
    position: relative;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Input personalizado */
.answer-input {
    width: 100%;
    padding: 0.85rem 1rem;
    border: 2px solid rgba(26, 95, 58, 0.3);
    border-radius: 10px;
    font-size: 1rem;
    font-family: 'Poppins', sans-serif;
    transition: all 0.3s ease;
    background: white;
}

.answer-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 95, 58, 0.1);
}

.answer-input:disabled {
    background: #f5f5f5;
    cursor: not-allowed;
}

/* Botones grandes */
.btn-large {
    padding: 1rem 2rem !important;
    font-size: 1.15rem !important;
}

/* Estilos para ranking */
.ranking-item {
    background: rgba(26, 95, 58, 0.05);
    padding: 1rem;
    border-radius: 10px;
    margin-bottom: 0.75rem;
    border: 1px solid rgba(26, 95, 58, 0.1);
    transition: all 0.3s ease;
}

.ranking-item:hover {
    background: rgba(26, 95, 58, 0.1);
    transform: translateX(5px);
}

.ranking-winner {
    background: linear-gradient(135deg, rgba(255, 215, 0, 0.2), rgba(244, 164, 96, 0.1));
    border: 2px solid rgba(255, 215, 0, 0.5);
}

/* Estilos de texto */
.text-primary {
    color: var(--color-primary) !important;
}

.text-secondary {
    color: #6c757d !important;
}

.text-success {
    color: #10b981 !important;
}

.text-warning {
    color: #f59e0b !important;
}

.text-error {
    color: #ef4444 !important;
}

/* Badges y etiquetas */
.badge-curso {
    background: rgba(99, 102, 241, 0.2);
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 700;
    color: #6366f1;
    display: inline-block;
}

.badge-winner {
    background: linear-gradient(135deg, #fbbf24, #f59e0b);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 6px;
    font-size: 0.85rem;
    font-weight: 700;
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
}

/* Cupón display */
.coupon-display {
    background: linear-gradient(135deg, #1e293b, #0f172a);
    color: #fbbf24;
    padding: 1.5rem;
    border-radius: 12px;
    text-align: center;
    font-family: 'Courier New', monospace;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: 4px;
    border: 3px solid #fbbf24;
    box-shadow: 0 0 30px rgba(251, 191, 36, 0.3);
    margin: 1.5rem 0;
}

/* Scrollbar personalizado para modales */
.modal-content::-webkit-scrollbar {
    width: 8px;
}

.modal-content::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 10px;
}

.modal-content::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 10px;
}

.modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

/* Responsive para modales */
@media (max-width: 768px) {
    .modal-content {
        padding: 1.5rem;
        max-width: 95%;
    }
    
    .coupon-display {
        font-size: 1.5rem;
        letter-spacing: 2px;
        padding: 1rem;
    }
    
    .btn-large {
        padding: 0.85rem 1.5rem !important;
        font-size: 1rem !important;
    }
}

@media (max-width: 480px) {
    .modal-content {
        padding: 1rem;
    }
    
    .coupon-display {
        font-size: 1.2rem;
        letter-spacing: 1px;
    }
}