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

:root {
    --background: #050505;
    --surface: #0d0d0f;
    --text: #f5f5f5;
    --text-secondary: #a7a7a7;
    --border: #22252a;
    --primary: #006eff;
    --primary-hover: #1683ff;
}

body.light-mode {
    --background: #ffffff;
    --surface: #f5f5f5;
    --text: #111111;
    --text-secondary: #555555;
    --border: #dddddd;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: Arial, sans-serif;
    background-color: var(--background);
    color: var(--text);
    line-height: 1.6;
}

a {
    color: inherit;
    text-decoration: none;
}

button,
input,
select,
textarea {
    font: inherit;
}

ul {
    list-style: none;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    width: 100%;
    background-color: var(--background);
    border-bottom: 1px solid var(--border);
}

section {
    scroll-margin-top: 90px;
}

nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 30px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 30px;
}

.logo {
    font-size: 24px;
    font-weight: bold;
    letter-spacing: 3px;
    color: var(--text);
}

nav ul {
    display: flex;
    align-items: center;
    gap: 30px;
}

nav ul a {
    color: var(--text-secondary);
    font-size: 15px;
    transition: color 0.3s ease;
}

nav ul a:hover {
    color: var(--text);
}

.nav-button {
    padding: 10px 18px;
    background-color: var(--primary);
    color: #ffffff;
    border: 1px solid var(--primary);
    border-radius: 6px;
    font-size: 14px;
    transition: background-color 0.3s ease;
}

.nav-button:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}

.theme-button {
    position: fixed;
    right: 24px;
    bottom: 24px;
    z-index: 10;
    width: 48px;
    height: 48px;
    display: grid;
    place-items: center;
    padding: 0;
    background-color: var(--primary);
    color: #ffffff;
    border: 1px solid var(--border);
    border-radius: 50%;
    font-size: 20px;
    line-height: 1;
    cursor: pointer;
    transition: 0.3s ease;
}

.theme-button:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
    transform: translateY(-2px);
}

/* HERO */

#inicio {
    min-height: 650px;
    display: flex;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 80px 30px;
}

.hero-content {
    max-width: 750px;
}

.hero-label {
    color: var(--primary);
    font-size: 14px;
    font-weight: bold;
    letter-spacing: 2px;
    margin-bottom: 20px;
}

.hero-content h1 {
    font-size: 64px;
    line-height: 1.1;
    margin-bottom: 25px;
}

.hero-description {
    max-width: 650px;
    color: var(--text-secondary);
    font-size: 20px;
    margin-bottom: 35px;
}

.hero-buttons {
    display: flex;
    gap: 15px;
}

.button {
    display: inline-block;
    padding: 13px 24px;
    border-radius: 6px;
    font-size: 15px;
    transition: 0.3s ease;
}

.primary-button {
    border: 1px solid var(--primary);
    outline: none;
    background-color: var(--primary);
    color: #ffffff;
    cursor: pointer;
}

.primary-button:hover {
    background-color: var(--primary-hover);
    border-color: var(--primary-hover);
}

.primary-button:focus {
    outline: none;
}

.secondary-button {
    background-color: transparent;
    border: 1px solid var(--border);
    color: var(--text);
}

.secondary-button:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* SERVICIOS */

#servicios {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 30px;
}

.section-header {
    max-width: 700px;
    margin-bottom: 50px;
}

.section-label {
    color: var(--primary);
    font-size: 14px;
    font-weight: bold;
    letter-spacing: 2px;
    margin-bottom: 15px;
}

.section-header h2 {
    font-size: 42px;
    line-height: 1.2;
    margin-bottom: 20px;
}

.section-header > p:last-child {
    color: var(--text-secondary);
    font-size: 17px;
}

/* FILTROS */

.service-filters {
    display: flex;
    gap: 10px;
    margin-bottom: 35px;
}

.filter-button {
    padding: 10px 18px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background-color: transparent;
    color: var(--text-secondary);
    cursor: pointer;
    transition: 0.3s ease;
}

.filter-button:hover {
    border-color: var(--primary);
    color: var(--text);
}

.filter-button.active {
    background-color: var(--primary);
    border-color: var(--primary);
    color: #ffffff;
}

/* TARJETAS */

#services-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

.service-card {
    min-height: 210px;
    padding: 30px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background-color: var(--surface);
    color: var(--text);
    transition: 0.3s ease;
}

.service-card:hover {
    border-color: var(--primary);
    transform: translateY(-4px);
}

.service-card h3 {
    font-size: 21px;
    margin-bottom: 15px;
    color: var(--text);
}

.service-card p {
    color: var(--text-secondary);
    font-size: 15px;
}

/* PROCESO */

#proceso {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 30px;
    border-top: 1px solid var(--border);
}

.process-container {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.process-step {
    padding: 30px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background-color: var(--surface);
}

.process-step span {
    display: block;
    color: var(--primary);
    font-size: 14px;
    font-weight: bold;
    margin-bottom: 25px;
}

.process-step h3 {
    font-size: 20px;
    margin-bottom: 15px;
}

.process-step p {
    color: var(--text-secondary);
    font-size: 15px;
}

/* SOBRE VENTEK */

#nosotros {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 30px;
    border-top: 1px solid var(--border);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

.about-title h2 {
    font-size: 42px;
    line-height: 1.2;
}

.about-text {
    padding-top: 30px;
}

.about-text p {
    color: var(--text-secondary);
    font-size: 17px;
    margin-bottom: 20px;
}

/* CONTACTO */

#contacto {
    max-width: 1200px;
    margin: 0 auto;
    padding: 100px 30px;
    border-top: 1px solid var(--border);
}

#contacto .section-header {
    margin-bottom: 50px;
}

#service-form {
    max-width: 800px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    flex-direction: column;
    margin-bottom: 25px;
}

.form-group label {
    margin-bottom: 8px;
    font-size: 15px;
    font-weight: bold;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 13px 15px;
    border: 1px solid var(--border);
    border-radius: 6px;
    background-color: var(--surface);
    color: var(--text);
    outline: none;
    transition: border-color 0.3s ease;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--primary);
}

.form-group textarea {
    resize: vertical;
}

input::placeholder,
textarea::placeholder {
    color: var(--text-secondary);
}

.error-message {
    min-height: 20px;
    margin-top: 6px;
    color: #ff5555;
    font-size: 13px;
}

#form-message {
    margin-top: 20px;
    color: var(--primary);
}

.success-modal[hidden] {
    display: none;
}

.success-modal {
    position: fixed;
    inset: 0;
    z-index: 20;
    display: grid;
    place-items: center;
    padding: 20px;
    background-color: rgba(0, 0, 0, 0.65);
}

.success-modal-content {
    width: min(100%, 460px);
    padding: 35px;
    background-color: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 8px;
    box-shadow: 0 12px 35px rgba(0, 0, 0, 0.25);
}

.success-modal-content h2 {
    margin-bottom: 15px;
    font-size: 26px;
    line-height: 1.2;
}

.success-modal-content p {
    margin-bottom: 25px;
    color: var(--text-secondary);
}

/* FOOTER */

footer {
    border-top: 1px solid var(--border);
    background-color: var(--surface);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 70px 30px;
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
}

.footer-brand p {
    max-width: 350px;
    margin-top: 15px;
    color: var(--text-secondary);
}

.footer-links,
.footer-services {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links h3,
.footer-services h3 {
    margin-bottom: 10px;
    font-size: 16px;
}

.footer-links a,
.footer-services a {
    color: var(--text-secondary);
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-links a:hover,
.footer-services a:hover {
    color: var(--primary-hover);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 30px;
    border-top: 1px solid var(--border);
}

.footer-bottom p {
    color: #666666;
    font-size: 13px;
}

/* RESPONSIVE */

.menu-button {
    display: none;
    border: none;
    background-color: transparent;
    color: var(--text);
    font-size: 28px;
    cursor: pointer;
}

@media (max-width: 768px) {

    nav {
        padding: 18px 20px;
        flex-wrap: wrap;
        position: relative;
    }

    .menu-button {
        display: block;
    }

    nav ul {
        display: none;
        width: 100%;
        flex-direction: column;
        align-items: center;
        gap: 20px;
        padding-top: 20px;
        order: 3;
    }

    nav ul.active {
        display: flex;
    }

    .nav-button {
        display: none;
    }

    #inicio {
        min-height: auto;
        padding: 80px 20px;
    }

    .hero-content h1 {
        font-size: 44px;
    }

    .hero-description {
        font-size: 17px;
    }

    .theme-button {
        right: 16px;
        bottom: 16px;
        width: 44px;
        height: 44px;
        font-size: 18px;
    }

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

    .button {
        text-align: center;
    }

    #servicios,
    #proceso,
    #nosotros,
    #contacto {
        padding: 80px 20px;
    }

    .section-header h2 {
        font-size: 34px;
    }

    #services-container {
        grid-template-columns: 1fr;
    }

    .process-container {
        grid-template-columns: 1fr;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 30px;
    }

    .about-text {
        padding-top: 0;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 40px;
        padding: 60px 20px;
    }

    .footer-bottom {
        padding: 20px;
    }
}