/* RESET Y VARIABLES */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --text-dark: #1f2937;
    --text-light: #6b7280;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --success: #10b981;
    --warning: #f59e0b;
    --error: #ef4444;
    --gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-light);
}

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

/* HEADER */
.header {
    background: var(--bg-white);
    box-shadow: var(--shadow);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    margin-right: 8px;
    font-size: 28px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--text-dark);
    margin: 3px 0;
    transition: 0.3s;
}

/* HERO */
.hero {
    padding: 120px 0 80px;
    background: var(--gradient);
    color: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 24px;
}

.highlight {
    color: #fbbf24;
}

.hero-description {
    font-size: 1.25rem;
    margin-bottom: 32px;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 28px;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
}

.btn-large {
    padding: 18px 36px;
    font-size: 1.1rem;
}

.hero-stats {
    display: flex;
    gap: 32px;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* PHONE MOCKUP */
.phone-mockup {
    position: relative;
    width: 300px;
    height: 600px;
    margin: 0 auto;
}

.phone-screen {
    background: var(--bg-white);
    border-radius: 30px;
    padding: 40px 20px;
    height: 100%;
    box-shadow: var(--shadow-lg);
    display: flex;
    flex-direction: column;
}

.app-content h3 {
    color: var(--text-dark);
    margin-bottom: 24px;
    text-align: center;
}

.exercise-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px;
    background: var(--bg-light);
    border-radius: 12px;
    margin-bottom: 12px;
}

.exercise-item i {
    color: var(--primary-color);
    font-size: 20px;
}

.start-btn {
    background: var(--gradient);
    color: white;
    border: none;
    padding: 16px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1.1rem;
    cursor: pointer;
    transition: transform 0.3s ease;
    margin-top: auto;
}

.start-btn:hover {
    transform: scale(1.05);
}

/* SECTIONS */
.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 1.1rem;
    text-align: center;
    color: var(--text-light);
    margin-bottom: 48px;
}

/* BENEFITS */
.benefits {
    padding: 80px 0;
    background: var(--bg-white);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.benefit-card {
    background: var(--bg-light);
    padding: 32px;
    border-radius: 16px;
    text-align: center;
    transition: transform 0.3s ease;
}

.benefit-card:hover {
    transform: translateY(-4px);
}

.benefit-icon {
    width: 80px;
    height: 80px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 24px;
}

.benefit-icon i {
    font-size: 32px;
    color: white;
}

.benefit-card h3 {
    font-size: 1.25rem;
    margin-bottom: 16px;
    color: var(--text-dark);
}

.benefit-card p {
    color: var(--text-light);
}

/* EXERCISES */
.exercises {
    padding: 80px 0;
    background: var(--bg-light);
}

.exercises-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 24px;
}

.exercise-card {
    background: var(--bg-white);
    border-radius: 16px;
    padding: 24px;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

.exercise-card:hover {
    transform: translateY(-4px);
}

.exercise-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
}

.exercise-header i {
    font-size: 24px;
    color: var(--primary-color);
}

.exercise-header h3 {
    font-size: 1.1rem;
    color: var(--text-dark);
}

.exercise-tag {
    display: inline-block;
    background: var(--primary-color);
    color: white;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    margin-bottom: 12px;
}

.exercise-body p {
    color: var(--text-light);
    margin-bottom: 16px;
}

.exercise-stats {
    color: var(--text-light);
    font-size: 0.9rem;
}

.exercise-stats i {
    color: var(--success);
    margin-right: 4px;
}

/* PLANS */
.plans {
    padding: 80px 0;
    background: var(--bg-white);
}

.plans-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.plan-features {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.feature {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.feature i {
    font-size: 24px;
    color: var(--primary-color);
    margin-top: 4px;
}

.feature h3 {
    margin-bottom: 4px;
    color: var(--text-dark);
}

.feature p {
    color: var(--text-light);
}

.progress-demo {
    background: var(--bg-light);
    padding: 32px;
    border-radius: 16px;
}

.progress-demo h3 {
    margin-bottom: 24px;
    color: var(--text-dark);
}

.progress-item {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 16px;
}

.progress-item span:first-child {
    width: 100px;
    font-weight: 500;
}

.progress-bar {
    flex: 1;
    height: 8px;
    background: #e5e7eb;
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient);
    transition: width 0.3s ease;
}

/* METRICS */
.metrics {
    padding: 80px 0;
    background: var(--bg-light);
}

.metrics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
}

.metric-card {
    background: var(--bg-white);
    padding: 32px;
    border-radius: 16px;
    text-align: center;
    box-shadow: var(--shadow);
}

.metric-card i {
    font-size: 48px;
    color: var(--primary-color);
    margin-bottom: 16px;
}

.metric-card h3 {
    margin-bottom: 12px;
    color: var(--text-dark);
}

.metric-card p {
    color: var(--text-light);
}

/* CTA */
.cta {
    padding: 80px 0;
    background: var(--gradient);
    color: white;
    text-align: center;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
}

.cta-content p {
    font-size: 1.2rem;
    margin-bottom: 32px;
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
    margin-bottom: 24px;
}

.cta-note {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* FOOTER */
.footer {
    background: var(--text-dark);
    color: white;
    padding: 48px 0 24px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer-section h3 {
    margin-bottom: 16px;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section a {
    color: #9ca3af;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-section a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: 16px;
    margin-top: 16px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.3s ease;
}

.social-links a:hover {
    background: rgba(255, 255, 255, 0.2);
}

.footer-bottom {
    border-top: 1px solid #374151;
    padding-top: 24px;
    text-align: center;
    color: #9ca3af;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

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

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .hero-stats {
        justify-content: center;
    }

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

    .cta-buttons {
        flex-direction: column;
        align-items: center;
    }

    .section-title {
        font-size: 2rem;
    }
}

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

    .phone-mockup {
        width: 250px;
        height: 500px;
    }

    .benefits-grid,
    .exercises-grid {
        grid-template-columns: 1fr;
    }
}