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Formulario de contacto con CSS

HTML

<nav class="navbar">
        <div class="navbar-container">
            <div class="logo">Premium</div>
            <button class="mobile-nav-toggle" aria-label="Toggle navigation">
                <span class="bar"></span>
                <span class="bar"></span>
                <span class="bar"></span>
            </button>
            <ul class="nav-links">
                <li><a href="#home">Home</a></li>
                <li><a href="#about">About</a></li>
                <li><a href="#services">Services</a></li>
                <li><a href="#portfolio">Portfolio</a></li>
                <li><a href="#contact">Contact</a></li>
            </ul>
        </div>
    </nav>
    <div class="overlay"></div>

<section id="home">
        <div class="bg-effect bg-effect-1"></div>
        <div class="section-content">
            <h1 class="section-title">Welcome</h1>
            <p class="section-description">Experience the future of design with our premium solutions</p>
        </div>
    </section>

<section id="about">
        <div class="bg-effect bg-effect-2"></div>
        <div class="section-content">
            <h1 class="section-title">About Us</h1>
            <p class="section-description">Pushing boundaries and creating extraordinary experiences since 2024</p>
        </div>
    </section>

<section id="services">
        <div class="bg-effect bg-effect-1"></div>
        <div class="section-content">
            <h1 class="section-title">Services</h1>
            <p class="section-description">Innovative solutions tailored to your unique needs</p>
        </div>
    </section>

<section id="portfolio">
        <div class="bg-effect bg-effect-2"></div>
        <div class="section-content">
            <h1 class="section-title">Portfolio</h1>
            <p class="section-description">Discover our groundbreaking projects and success stories</p>
        </div>
    </section>

<section id="contact">
        <div class="bg-effect bg-effect-1"></div>
        <div class="section-content">
            <h1 class="section-title">Contact</h1>
            <p class="section-description">Let's create something amazing together</p>
        </div>
    </section>

CSS

* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

:root {
            --gradient: linear-gradient(45deg, #ff3366, #ff6b6b, #4834d4, #686de0);
            --glass-bg: rgba(255, 255, 255, 0.05);
            --border: 1px solid rgba(255, 255, 255, 0.1);
            --shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
        }

body {
            background: #0a0a0a;
            min-height: 100vh;
        }

.navbar {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            padding: 1.2rem 5%;
            backdrop-filter: blur(12px);
            background: var(--glass-bg);
            border-bottom: var(--border);
            z-index: 1000;
            transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            box-shadow: var(--shadow);
        }

.navbar.scrolled {
            padding: 0.8rem 5%;
            background: rgba(10, 10, 10, 0.95);
        }

.navbar-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1400px;
            margin: 0 auto;
        }

.logo {
            font-size: 1.8rem;
            font-weight: 700;
            background: var(--gradient);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            animation: gradient 8s linear infinite;
            background-size: 300%;
            letter-spacing: -0.5px;
        }

.nav-links {
            display: flex;
            gap: 2.5rem;
            list-style: none;
        }

.nav-links a {
            color: white;
            text-decoration: none;
            font-weight: 500;
            position: relative;
            padding: 0.5rem 0;
            transition: all 0.3s ease;
            font-size: 1.05rem;
            letter-spacing: 0.3px;
        }

.nav-links a::before {
            content: '';
            position: absolute;
            top: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--gradient);
            background-size: 300%;
            transition: width 0.3s ease;
        }

.nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            right: 0;
            width: 0;
            height: 2px;
            background: var(--gradient);
            background-size: 300%;
            transition: width 0.3s ease;
        }

.nav-links a:hover {
            color: #fff;
            text-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
        }

.nav-links a:hover::before,
        .nav-links a:hover::after {
            width: 100%;
            animation: gradient 8s linear infinite;
        }

.mobile-nav-toggle {
            display: none;
            background: none;
            border: none;
            cursor: pointer;
            width: 40px;
            height: 40px;
            position: relative;
            z-index: 1001;
            border-radius: 50%;
            transition: background-color 0.3s ease;
        }

.mobile-nav-toggle:hover {
            background-color: rgba(255, 255, 255, 0.1);
        }

.mobile-nav-toggle .bar {
            position: absolute;
            left: 50%;
            transform: translateX(-50%);
            width: 20px;
            height: 2px;
            background: white;
            transition: all 0.4s ease;
        }

.mobile-nav-toggle .bar:nth-child(1) { top: 14px; }
        .mobile-nav-toggle .bar:nth-child(2) { top: 19px; }
        .mobile-nav-toggle .bar:nth-child(3) { top: 24px; }

@keyframes gradient {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }

@media (max-width: 768px) {
            .nav-links {
                position: fixed;
                top: 0;
                right: -100%;
                height: 100vh;
                width: 80%;
                max-width: 400px;
                background: linear-gradient(135deg, rgba(10, 10, 10, 0.99), rgba(20, 20, 20, 0.99));
                flex-direction: column;
                justify-content: center;
                align-items: center;
                gap: 2rem;
                transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
                box-shadow: -10px 0 30px rgba(0, 0, 0, 0.5);
                padding: 2rem;
                backdrop-filter: blur(10px);
            }

.nav-links::before {
                content: '';
                position: absolute;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.03));
                pointer-events: none;
            }

.nav-links.active {
                right: 0;
            }

.nav-links a {
                font-size: 1.2rem;
                opacity: 0;
                transform: translateX(20px);
                transition: all 0.4s ease;
            }

.nav-links.active a {
                opacity: 1;
                transform: translateX(0);
            }

.nav-links a:nth-child(1) { transition-delay: 0.1s; }
            .nav-links a:nth-child(2) { transition-delay: 0.2s; }
            .nav-links a:nth-child(3) { transition-delay: 0.3s; }
            .nav-links a:nth-child(4) { transition-delay: 0.4s; }
            .nav-links a:nth-child(5) { transition-delay: 0.5s; }

.mobile-nav-toggle {
                display: block;
            }

.mobile-nav-toggle.active .bar:nth-child(1) {
                transform: translate(-50%, 5px) rotate(45deg);
                width: 24px;
            }

.mobile-nav-toggle.active .bar:nth-child(2) {
                opacity: 0;
            }

.mobile-nav-toggle.active .bar:nth-child(3) {
                transform: translate(-50%, -5px) rotate(-45deg);
                width: 24px;
            }

.overlay {
                position: fixed;
                top: 0;
                left: 0;
                width: 100%;
                height: 100%;
                background: rgba(0, 0, 0, 0.5);
                opacity: 0;
                visibility: hidden;
                transition: all 0.4s ease;
                backdrop-filter: blur(4px);
            }

.overlay.active {
                opacity: 1;
                visibility: visible;
            }
        }

.section-title {
                font-size: 3rem;
            }

.section-description {
                font-size: 1rem;
                padding: 0 1rem;
            }

section {
            min-height: 100vh;
            padding: 120px 5% 80px;
            display: flex;
            justify-content: center;
            align-items: center;
            position: relative;
            overflow: hidden;
        }

section:nth-child(even) {
            background: var(--section-bg);
        }

.section-content {
            max-width: 1400px;
            width: 100%;
            text-align: center;
            position: relative;
            z-index: 1;
        }

.section-title {
            font-size: 8vw;
            font-weight: 800;
            margin-bottom: 2rem;
            background: var(--gradient);
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
            animation: gradient 8s linear infinite;
            background-size: 300%;
            line-height: 1.1;
            text-transform: uppercase;
            letter-spacing: -2px;
        }

.section-description {
            font-size: 1.2rem;
            max-width: 800px;
            margin: 0 auto;
            line-height: 1.6;
            opacity: 0.8;
          color: white;
        }

const navbar = document.querySelector('.navbar');
        const mobileNavToggle = document.querySelector('.mobile-nav-toggle');
        const navLinks = document.querySelector('.nav-links');
        const overlay = document.querySelector('.overlay');
        let isMenuOpen = false;

// Scroll effect
        window.addEventListener('scroll', () => {
            if (window.scrollY > 50) {
                navbar.classList.add('scrolled');
            } else {
                navbar.classList.remove('scrolled');
            }
        });

// Toggle mobile menu
        function toggleMenu() {
            isMenuOpen = !isMenuOpen;
            mobileNavToggle.classList.toggle('active');
            navLinks.classList.toggle('active');
            overlay.classList.toggle('active');
            document.body.style.overflow = isMenuOpen ? 'hidden' : '';
        }

mobileNavToggle.addEventListener('click', toggleMenu);
        overlay.addEventListener('click', toggleMenu);

// Close mobile menu when clicking a link
        document.querySelectorAll('.nav-links a').forEach(link => {
            link.addEventListener('click', () => {
                if (isMenuOpen) toggleMenu();
            });
        });

// Close menu on escape key
        document.addEventListener('keydown', (e) => {
            if (e.key === 'Escape' && isMenuOpen) toggleMenu();
        });

// Prevent scroll when menu is open
        window.addEventListener('resize', () => {
            if (window.innerWidth > 768 && isMenuOpen) {
                toggleMenu();
            }
        });