/* Reset y Variables */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #013459;
    --accent-color: #00a8e8;
    --light-bg: #f0f7fa;
    --white: #ffffff;
    --text-dark: #333333;
    --text-light: #666666;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: var(--light-bg);
    overflow-x: hidden;
}

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

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--accent-color) 100%);
    color: var(--white);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    font-weight: bold;
    animation: logoGlow 2s ease-in-out infinite alternate;
}

.logo-img {
    height: 40px;
    width: auto;
    max-width: 180px;
    object-fit: contain;
    object-position: left center;
    filter: brightness(1.1);
    transition: var(--transition);
}

.logo:hover .logo-img {
    transform: scale(1.05);
    filter: brightness(1.2) drop-shadow(0 0 10px rgba(255,255,255,0.3));
}

@keyframes logoGlow {
    from { filter: brightness(1.1); }
    to { filter: brightness(1.2) drop-shadow(0 0 8px rgba(255,255,255,0.2)); }
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--white);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-links a:hover::after {
    width: 80%;
}

.nav-links a:hover {
    background: rgba(255,255,255,0.15);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* Hero Section */
.hero {
    padding: 120px 0 80px;
    background: linear-gradient(135deg, var(--light-bg) 0%, rgba(0, 168, 232, 0.1) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(0,168,232,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 4rem;
    position: relative;
    z-index: 2;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-text p {
    font-size: 1.3rem;
    color: var(--text-light);
    margin-bottom: 2rem;
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    animation: fadeInUp 1s ease-out 0.4s both;
}

.btn {
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    display: inline-block;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--white);
    box-shadow: var(--shadow);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 168, 232, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: var(--white);
    transform: translateY(-3px);
}

/* Phone Image */
.phone-mockup {
    width: 300px;
    height: 600px;
    position: relative;
    animation: phoneFloat 3s ease-in-out infinite alternate;
}

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

.phone-mockup img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    filter: drop-shadow(0 20px 40px rgba(0,0,0,0.3));
    transition: var(--transition);
}

.phone-mockup:hover img {
    transform: scale(1.05);
    filter: drop-shadow(0 25px 50px rgba(0,168,232,0.3));
}

/* Features Section */
.features {
    padding: 80px 0;
    background: var(--white);
}

.features h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(0, 168, 232, 0.2);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: var(--white);
    font-size: 2rem;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--primary-color);
}

.feature-card p {
    color: var(--text-light);
    line-height: 1.8;
}

/* Roles Section */
.roles {
    padding: 80px 0;
    background: var(--light-bg);
}

.roles h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.roles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 3rem;
}

.role-card {
    background: var(--white);
    padding: 0;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    transition: var(--transition);
    overflow: hidden;
    position: relative;
}

.role-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 6px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    transform: scaleX(0);
    transition: var(--transition);
}

.role-card:hover::before {
    transform: scaleX(1);
}

.role-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 50px rgba(0,0,0,0.15);
}

.role-header {
    padding: 2.5rem 2.5rem 1rem;
    text-align: center;
    position: relative;
}

.role-icon {
    width: 90px;
    height: 90px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    font-size: 2.2rem;
    color: var(--white);
    position: relative;
    z-index: 2;
}

.role-icon::before {
    content: '';
    position: absolute;
    top: -10px;
    left: -10px;
    right: -10px;
    bottom: -10px;
    border-radius: 50%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.2), transparent);
    z-index: -1;
    opacity: 0;
    transition: var(--transition);
}

.role-card:hover .role-icon::before {
    opacity: 1;
    animation: rotate 2s linear infinite;
}

.admin .role-icon {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    box-shadow: 0 8px 25px rgba(0, 168, 232, 0.3);
}

.driver .role-icon {
    background: linear-gradient(135deg, #28a745, #20c997);
    box-shadow: 0 8px 25px rgba(40, 167, 69, 0.3);
}

.role-card h3 {
    font-size: 1.6rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    font-weight: 700;
}

.role-subtitle {
    color: var(--text-light);
    font-size: 1rem;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.role-content {
    padding: 0 2.5rem 2.5rem;
}

.role-card ul {
    list-style: none;
    display: grid;
    gap: 1rem;
}

.role-card li {
    padding: 1rem 1.5rem;
    background: var(--light-bg);
    border-radius: 12px;
    color: var(--text-dark);
    position: relative;
    padding-left: 3rem;
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.role-card li:hover {
    background: rgba(0, 168, 232, 0.05);
    border-left-color: var(--accent-color);
    transform: translateX(5px);
}

.role-card li::before {
    content: '';
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    width: 8px;
    height: 8px;
    background: var(--accent-color);
    border-radius: 50%;
    box-shadow: 0 0 0 3px rgba(0, 168, 232, 0.2);
}

.admin li::before {
    background: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(0, 168, 232, 0.2);
}

.driver li::before {
    background: #28a745;
    box-shadow: 0 0 0 3px rgba(40, 167, 69, 0.2);
}

.role-badge {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: linear-gradient(135deg, var(--accent-color), var(--primary-color));
    color: var(--white);
    padding: 0.4rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.driver .role-badge {
    background: linear-gradient(135deg, #28a745, #20c997);
}

/* Tech Section */
.tech {
    padding: 80px 0;
    background: var(--white);
}

.tech h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--primary-color);
}

.tech-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 4rem;
}

.tech-text h3 {
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--primary-color);
}

.tech-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.tech-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--light-bg);
    border-radius: var(--border-radius);
    transition: var(--transition);
}

.tech-item:hover {
    transform: translateX(10px);
    background: rgba(0, 168, 232, 0.1);
}

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

.tech-item span {
    font-weight: 600;
    color: var(--text-dark);
}

/* Tech Visual */
.tech-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.tech-circle {
    position: relative;
    width: 300px;
    height: 300px;
}

.tech-orbit {
    position: absolute;
    border: 2px solid rgba(0, 168, 232, 0.2);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.orbit-1 {
    width: 100px;
    height: 100px;
    top: 100px;
    left: 100px;
}

.orbit-2 {
    width: 160px;
    height: 160px;
    top: 70px;
    left: 70px;
    animation-duration: 30s;
    animation-direction: reverse;
}

.orbit-3 {
    width: 220px;
    height: 220px;
    top: 40px;
    left: 40px;
    animation-duration: 40s;
}

@keyframes rotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.tech-dot {
    width: 12px;
    height: 12px;
    background: var(--accent-color);
    border-radius: 50%;
    position: absolute;
    top: -6px;
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 10px var(--accent-color);
}

.tech-center {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 2rem;
    animation: pulse 2s ease-in-out infinite;
}

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

/* Contact Section */
.contact {
    padding: 80px 0;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="contactGrid" width="20" height="20" patternUnits="userSpaceOnUse"><path d="M 20 0 L 0 0 0 20" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="0.5"/></pattern></defs><rect width="100" height="100" fill="url(%23contactGrid)"/></svg>');
    opacity: 0.3;
}

.contact h2 {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    position: relative;
    z-index: 2;
}

.contact > p {
    text-align: center;
    font-size: 1.2rem;
    margin-bottom: 3rem;
    opacity: 0.9;
    position: relative;
    z-index: 2;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
    position: relative;
    z-index: 2;
}

.contact-form {
    background: var(--white);
    padding: 3rem;
    border-radius: 20px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
}

.contact-form::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 5px;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
}

.form-header {
    text-align: center;
    margin-bottom: 2rem;
}

.form-header h3 {
    color: var(--primary-color);
    font-size: 1.8rem;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.form-header p {
    color: var(--text-light);
    font-size: 1rem;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.form-group {
    position: relative;
}

.form-group.full-width {
    grid-column: 1 / -1;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1.2rem 1.5rem;
    border: 2px solid #e1e8ed;
    border-radius: 12px;
    background: var(--white);
    color: var(--text-dark);
    font-size: 1rem;
    transition: all 0.3s ease;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 4px rgba(0, 168, 232, 0.1);
    transform: translateY(-2px);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: #9ca3af;
    font-weight: 400;
}

.form-group label {
    position: absolute;
    top: 1.2rem;
    left: 1.5rem;
    color: #9ca3af;
    font-size: 1rem;
    transition: all 0.3s ease;
    pointer-events: none;
    background: var(--white);
    padding: 0 0.5rem;
}

.form-group input:focus + label,
.form-group input:not(:placeholder-shown) + label,
.form-group select:focus + label,
.form-group select:not([value=""]) + label,
.form-group textarea:focus + label,
.form-group textarea:not(:placeholder-shown) + label {
    top: -0.5rem;
    left: 1rem;
    font-size: 0.8rem;
    color: var(--accent-color);
    font-weight: 600;
}

.form-group select {
    cursor: pointer;
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn-submit {
    width: 100%;
    padding: 1.3rem 2rem;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: var(--white);
    border: none;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    margin-top: 1rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn-submit:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 168, 232, 0.4);
}

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

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-info h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
    position: relative;
}

.contact-item::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 16px;
    opacity: 0;
    transition: var(--transition);
}

.contact-item:hover::before {
    opacity: 1;
}

.contact-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,0,0,0.2);
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--white);
    flex-shrink: 0;
}

.contact-item h4 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
    font-weight: 600;
}

.contact-item a {
    color: var(--white);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

.contact-item a:hover {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: underline;
}

/* Footer */
footer {
    background: var(--primary-color);
    color: var(--white);
    padding: 2rem 0;
    text-align: center;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    font-weight: bold;
}

.footer-logo-img {
    height: 35px;
    width: auto;
    object-fit: contain;
    filter: brightness(1.2);
    transition: var(--transition);
}

.footer-logo:hover .footer-logo-img {
    transform: scale(1.05);
    filter: brightness(1.3);
}

.footer-text {
    text-align: right;
}

.footer-text p {
    margin: 0.2rem 0;
    opacity: 0.8;
}

/* Loading Animation */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255,255,255,.3);
    border-radius: 50%;
    border-top-color: var(--white);
    animation: spin 1s ease-in-out infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Success Message */
.success-message {
    background: #28a745;
    color: var(--white);
    padding: 1rem;
    border-radius: 8px;
    margin-top: 1rem;
    text-align: center;
    display: none;
}

.success-message.show {
    display: block;
    animation: slideDown 0.5s ease-out;
}

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

/* Responsive Design */
@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 2rem;
    }
    
    .hero-text h1 {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        justify-content: center;
        flex-wrap: wrap;
    }
    
    .phone-mockup {
        width: 250px;
        height: 500px;
        margin: 0 auto;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .roles-grid {
        grid-template-columns: 1fr;
    }
    
    .tech-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .tech-features {
        grid-template-columns: 1fr;
    }
    
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-text {
        text-align: center;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 100px 0 60px;
    }
    
    .hero-text h1 {
        font-size: 2rem;
    }
    
    .hero-text p {
        font-size: 1.1rem;
    }
    
    .btn {
        padding: 0.8rem 1.5rem;
        font-size: 1rem;
    }
    
    .phone-mockup {
        width: 200px;
        height: 400px;
    }
    
    .app-interface {
        padding: 1.5rem 1rem;
    }
    
    .features,
    .roles,
    .tech {
        padding: 60px 0;
    }
    
    .contact {
        padding: 60px 0;
    }
    
    .contact-form {
        padding: 2rem;
    }
    
    h2 {
        font-size: 2rem;
    }
    
    .tech-circle {
        width: 200px;
        height: 200px;
    }
    
    .orbit-1 {
        width: 70px;
        height: 70px;
        top: 65px;
        left: 65px;
    }
    
    .orbit-2 {
        width: 120px;
        height: 120px;
        top: 40px;
        left: 40px;
    }
    
    .orbit-3 {
        width: 170px;
        height: 170px;
        top: 15px;
        left: 15px;
    }
    
    .tech-center {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }
}

/* Animaciones adicionales */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.6s ease-out;
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.6s ease-out;
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

/* Efecto de ondas para botones */
.btn {
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}