:root {
    --primary-dark: #0a1928;
    --primary-light: #2dd4bf;
    --text-light: #f8f9fa;
    --text-dark: #333;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --shadow: 0 4px 6px rgba(0,0,0,0.1);
    --border-radius: 8px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background-color: var(--bg-white);
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header */
.header {
    background-color: var(--primary-dark);
    color: white;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 20px;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-light);
    text-decoration: none;
}

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

.nav a {
    color: white;
    text-decoration: none;
    transition: color 0.3s;
    font-weight: 500;
}

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

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 2rem;
    cursor: pointer;
}

/* Sections */
.section {
    padding: 5rem 0;
}

.bg-light {
    background-color: var(--bg-light);
}

.hero {
    background: linear-gradient(135deg, var(--primary-dark), #1e3a5f);
    color: white;
    text-align: center;
    padding: 6rem 0;
}

.hero h1 {
    font-size: 2.8rem;
    margin-bottom: 1rem;
}

.hero .subtitle {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 2rem;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    transition: background-color 0.3s, transform 0.2s;
    border: none;
    cursor: pointer;
}

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

.btn-primary:hover {
    background-color: #25b9a4;
    transform: translateY(-2px);
}

/* Cards */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.card {
    background: white;
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: transform 0.3s;
}

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

.card h3 {
    margin-bottom: 1rem;
    color: var(--primary-dark);
}

/* Steps */
.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.step {
    text-align: center;
    padding: 2rem;
    background: var(--bg-light);
    border-radius: var(--border-radius);
}

.step-number {
    display: inline-block;
    width: 50px;
    height: 50px;
    line-height: 50px;
    background: var(--primary-light);
    color: var(--primary-dark);
    font-size: 1.8rem;
    font-weight: 700;
    border-radius: 50%;
    margin-bottom: 1rem;
}

/* Client list */
.client-list {
    list-style: none;
    padding: 1rem 0;
}

.client-list li {
    padding: 0.5rem 0;
    border-bottom: 1px solid #ddd;
}

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

/* Methods */
.methods-list {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    padding: 1rem 0;
}

.methods-list li {
    background: var(--primary-light);
    color: var(--primary-dark);
    padding: 0.5rem 1rem;
    border-radius: 50px;
    font-weight: 500;
}

/* Tools cloud */
.tools-cloud {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.tool {
    background: var(--bg-light);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    border: 1px solid #ddd;
    font-weight: 500;
    transition: all 0.3s;
}

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

/* Contact form */
.contact-form {
    max-width: 600px;
    margin: 2rem auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 2px rgba(45, 212, 191, 0.2);
}

.form-note {
    font-size: 0.9rem;
    color: #777;
    text-align: center;
}

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

.footer a {
    color: var(--primary-light);
    text-decoration: none;
}

/* Error page */
.error-section {
    text-align: center;
    padding: 6rem 0;
}

.error-section h1 {
    font-size: 3rem;
    color: var(--primary-dark);
    margin-bottom: 1rem;
}

/* Responsive */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }

    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--primary-dark);
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
    }

    .nav.active {
        max-height: 300px;
    }

    .nav ul {
        flex-direction: column;
        padding: 1rem;
        gap: 1rem;
    }

    .hero h1 {
        font-size: 2rem;
    }

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

    .cards-grid, .steps {
        grid-template-columns: 1fr;
    }
}