/* ========================================
   RESET Y VARIABLES GLOBALES - IYS
   ======================================== */

/* Reset básico para consistencia cross-browser */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}


:root {
    /* Variables base */
    --iys-border-radius: 12px;
    --iys-border-radius-small: 8px;
    --iys-transition: all 0.3s ease;
    --iys-transition-bg: background-color 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    --iys-spacing-section: 120px;
    --iys-spacing-element: 60px;
    --iys-spacing-small: 40px;

    /* Modo Claro (por defecto) */
    --iys-white: #ffffff;
    --iys-black: #1a1a1a;
    --iys-gray-dark: #333333;
    --iys-gray-light: #f8f9fa;
    --iys-gray-medium: #e9ecef;
    --iys-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --iys-shadow-hover: 0 2px 8px rgba(0, 0, 0, 0.12);

    /* Fondos dinámicos - Modo Claro */
    --bg-hero: #ffffff;
    --bg-clientes: #f8f9fa;
    --bg-servicios: #ffffff;
    --bg-contacto: #f5f5f5;
}

/* Modo Oscuro */
[data-theme="dark"] {
    /* Colores invertidos para modo oscuro */
    --iys-white: #1a1a1a;
    --iys-black: #ffffff;
    --iys-gray-dark: #cccccc;
    --iys-gray-light: #2a2a2a;
    --iys-gray-medium: #3a3a3a;
    --iys-shadow: 0 1px 3px rgba(255, 255, 255, 0.1);
    --iys-shadow-hover: 0 2px 8px rgba(255, 255, 255, 0.12);

    /* Fondos dinámicos - Modo Oscuro */
    --bg-hero: #1a1a1a;
    --bg-clientes: #2a2a2a;
    --bg-servicios: #1a1a1a;
    --bg-contacto: #252525;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--iys-black);
    background-color: var(--bg-hero);
    overflow-x: hidden;
    font-weight: 400;
    transition: var(--iys-transition-bg), background-color 0.5s ease, color 0.3s ease;
}

/* Transiciones suaves para el cambio de tema */
* {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

/* ========================================
   UTILIDADES Y LAYOUT BASE
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* ========================================
   HEADER Y NAVEGACIÓN
   ======================================== */

/* Header */
.header {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    z-index: 1000;
    transition: var(--iys-transition);
    border-bottom: 1px solid rgba(0, 0, 0, 0.08);
    backdrop-filter: blur(10px);
}

/* Header en modo oscuro */
[data-theme="dark"] .header {
    background: rgba(26, 26, 26, 0.95);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 0;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px 40px;
}

.logo h1 {
    color: var(--iys-black);
    font-size: 29px;
    font-weight: 600;
    letter-spacing: -0.02em;

}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 40px;
}

.nav-menu a {
    color: var(--iys-black);
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    transition: var(--iys-transition);
    letter-spacing: -0.01em;
}

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

/* Selector de tema */
.theme-toggle {
    margin-left: 20px;
}

.theme-btn {
    background: transparent;
    border: 2px solid var(--iys-black);
    color: var(--iys-black);
    width: 44px;
    height: 44px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    transition: var(--iys-transition);
    position: relative;
    overflow: hidden;
}

.theme-btn:hover {
    background: var(--iys-black);
    color: var(--iys-white);
    transform: scale(1.05);
}

.theme-btn .fa-sun {
    display: none;
}

.theme-btn .fa-moon {
    display: block;
}

/* Modo oscuro - mostrar sol */
[data-theme="dark"] .theme-btn .fa-sun {
    display: block;
}

[data-theme="dark"] .theme-btn .fa-moon {
    display: none;
}

[data-theme="dark"] .theme-btn {
    border-color: var(--iys-black);
    color: var(--iys-black);
}

[data-theme="dark"] .theme-btn:hover {
    background: var(--iys-black);
    color: var(--iys-white);
}

/* Responsive para selector de tema */
@media (max-width: 768px) {
    .theme-toggle {
        margin-left: 15px;
    }

    .theme-btn {
        width: 40px;
        height: 40px;
        font-size: 16px;
    }
}


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

.hamburger span {
    width: 25px;
    height: 2px;
    background: var(--iys-black);
    margin: 4px 0;
    transition: var(--iys-transition);
    border-radius: 1px;
}

/* ========================================
   SECCIÓN HERO
   ======================================== */

.hero {
    min-height: 100vh;
    background: transparent;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 120px 0;

}

.hero-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 40px;
    text-align: center;
}

.hero-content {
    max-width: 1000px;
    margin: 0 auto;
}

.hero-title {
    font-size: 96px;
    font-weight: 600;
    color: var(--iys-black);
    line-height: 1.05;
    margin-bottom: 48px;
    letter-spacing: -0.03em;
    text-wrap: balance;
}

.hero-subtitle {
    font-size: 29px;
    color: var(--iys-black);
    margin-bottom: 64px;
    line-height: 1.4;
    font-weight: 400;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    text-wrap: balance;
}

.hero-cta {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 48px;
}

/* Secciones generales */
.section-title {
    font-size: 58px;
    font-weight: 600;
    text-align: center;
    margin-bottom: var(--iys-spacing-section);
    color: var(--iys-black);
    letter-spacing: -0.02em;
}

.clientes .section-title {
    margin-bottom: 60px;
}

.servicios, .clientes, .contacto {
    padding: var(--iys-spacing-section) 0;
}

/* ========================================
   SECCIÓN SERVICIOS
   ======================================== */

.servicios {
    background: transparent;
    color: var(--iys-black);
}

.servicio-card {
    background: var(--iys-white);
    padding: var(--iys-spacing-element);
    border-radius: var(--iys-border-radius);
    border: 1px solid var(--iys-gray-medium);
    transition: var(--iys-transition);
    box-shadow: var(--iys-shadow);
    margin-bottom: 32px;
}

.servicio-card:hover {
    box-shadow: var(--iys-shadow);
    transform: translateY(-2px);
}

.servicio-icon {
    width: 64px;
    height: 64px;
    background: var(--iys-gray-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: var(--iys-black);
    font-size: 24px;
    border: 1px solid var(--iys-gray-medium);
}

.servicio-icon img {
    width: 24px;
    height: 24px;
    object-fit: contain;
    /* border-radius: 50%; */
}

.servicio-card h3 {
    font-size: 34px;
    margin-bottom: 16px;
    font-weight: 600;
    color: var(--iys-black);
    letter-spacing: -0.02em;
}

.servicio-card p {
    margin-bottom: 16px;
    color: var(--iys-black);
    line-height: 1.6;
}

.servicio-card ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.servicio-card li {
    margin-bottom: 12px;
    padding-left: 24px;
    position: relative;
    color: var(--iys-black);
    font-size: 16px;
    line-height: 1.5;
}

.servicio-card li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--iys-black);
    font-weight: bold;
}

/* ========================================
   SECCIÓN CLIENTES
   ======================================== */

.clientes {
    background: transparent;
    color: var(--iys-black);
}

.clientes-description {
    text-align: center;
    font-size: 18px;
    color: var(--iys-black);
    margin-bottom: 64px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.6;
}

/* Marquee de clientes - Ancho completo */
.marquee-fullwidth {
    width: 100vw;
    position: relative;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
    margin-top: 60px;
    overflow: hidden;
}

.marquee-track {
    margin-bottom: 30px;
    overflow: hidden;
    position: relative;
    white-space: nowrap;
}

.marquee-content {
    display: inline-flex;
    align-items: center;
    gap: 30px;
    animation: marquee-left 80s linear infinite;
}

.marquee-right .marquee-content {
    animation: marquee-right 90s linear infinite;
}

.client-text {
    font-size: 34px;
    font-weight: 400;
    color: var(--iys-black);
    opacity: 0.6;
    transition: opacity 0.3s ease;
    white-space: nowrap;
    display: inline-block;
}

.client-text:hover {
    opacity: 1;
}

/* Sin separador entre clientes */

/* Animaciones del marquee - Más lentas */
@keyframes marquee-left {
    0% {
        transform: translateX(0%);
    }
    100% {
        transform: translateX(-50%);
    }
}

@keyframes marquee-right {
    0% {
        transform: translateX(-50%);
    }
    100% {
        transform: translateX(0%);
    }
}

/* Animación continua sin pausa en hover */

/* Modo oscuro para texto de clientes */
[data-theme="dark"] .client-text {
    color: #ffffff !important; /* Blanco puro para máximo contraste */
    opacity: 0.95 !important; /* Opacidad alta para mejor legibilidad */
}

[data-theme="dark"] .client-text:hover {
    opacity: 1 !important;
}

/* ========================================
   SECCIÓN CONTACTO
   ======================================== */

.contacto {
    background: transparent;
}

.contacto-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
}

.contacto-texto {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    /*padding-top: 40px;*/
}

.contacto .section-title {
    text-align: left;
    margin-bottom: 24px;
}

.trabajemos-text {
    font-size: 24px;
    color: var(--iys-black);
    line-height: 1.6;
    margin-bottom: 32px;
}

.contacto-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
    max-width: 600px;
    margin: 0 auto;
}

/* Layout de filas del formulario */
.form-row {
    display: flex;
    gap: 20px;
}

.form-row .form-group {
    flex: 1;
}

.form-group-full {
    width: 100%;
}

.form-group {
    position: relative;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid var(--iys-gray-medium);
    border-radius: var(--iys-border-radius);
    font-family: inherit;
    font-size: 16px;
    transition: var(--iys-transition);
    background: var(--iys-white);
    color: var(--iys-black);
    box-sizing: border-box;
}

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

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--iys-black);
    box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.05);
}

[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group textarea:focus {
    border-color: var(--iys-white);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--iys-black);
}

/* Placeholder en modo oscuro */
[data-theme="dark"] .form-group input::placeholder,
[data-theme="dark"] .form-group textarea::placeholder {
    color: var(--iys-gray-dark);
}

/* Estados de validación del formulario */
.form-group input.error,
.form-group textarea.error {
    border-color: #ef4444;
    background-color: #fef2f2;
    color: var(--iys-black);
}

.form-group input.valid,
.form-group textarea.valid {
    border-color: #10b981;
    background-color: #f0fdf4;
    color: var(--iys-black);
}

/* Estados de validación en modo oscuro */
[data-theme="dark"] .form-group input.error,
[data-theme="dark"] .form-group textarea.error {
    background-color: #451a1a; /* Rojo oscuro */
    color: #fca5a5; /* Rojo claro para texto */
    border-color: #dc2626;
}

[data-theme="dark"] .form-group input.valid,
[data-theme="dark"] .form-group textarea.valid {
    background-color: #14532d; /* Verde oscuro */
    color: #86efac; /* Verde claro para texto */
    border-color: #16a34a;
}

.error-message {
    color: #ef4444;
    font-size: 14px;
    margin-top: 4px;
    display: none;
    font-weight: 500;
}

/* Estilos del botón */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    border: 2px solid var(--iys-black);
    background: var(--iys-black);
    color: var(--iys-white);
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--iys-border-radius);
    cursor: pointer;
    transition: var(--iys-transition);
    font-family: inherit;
    min-width: 160px;
    text-align: center;
}

.btn:hover {
    background: var(--iys-white);
    color: var(--iys-black);
    transform: translateY(-2px);
    box-shadow: var(--iys-shadow);
}

.btn:active {
    transform: translateY(0);
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    background-color: var(--iys-gray-medium);
    color: var(--iys-black);
    border-color: var(--iys-gray-medium);
    transform: none;
}

.btn:disabled:hover {
    transform: none;
    box-shadow: none;
    background-color: var(--iys-gray-medium);
    color: var(--iys-black);
}

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

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

/* ========================================
   FOOTER
   ======================================== */

.footer {
    background: transparent;
    color: var(--iys-black);
    padding: var(--iys-spacing-element) 0 32px;
    border-top: 1px solid var(--iys-gray-medium);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 64px;
    margin-bottom: 48px;
}

.footer-logo h3 {
    color: var(--iys-black);
    margin-bottom: 16px;
    font-size: 29px;
    font-weight: 600;
}

.footer-logo p {
    color: var(--iys-black);
    line-height: 1.6;
    margin-bottom: 24px;
}

.footer-logo h4 {
    color: var(--iys-black);
    margin: 32px 0 16px 0;
    font-size: 22px;
    font-weight: 600;
}

.footer-logo ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.footer-logo li {
    margin-bottom: 12px;
    padding-left: 24px;
    position: relative;
    font-size: 16px;
    color: var(--iys-black);
    line-height: 1.5;
}

.footer-logo li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--iys-black);
}

.footer-contacto h4 {
    color: var(--iys-black);
    margin-bottom: 24px;
    font-size: 18px;
    font-weight: 600;
}

.contacto-info {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 16px;
}

.info-item i {
    color: var(--iys-black);
    font-size: 20px;
    width: 20px;
}

.info-item span {
    color: var(--iys-black);
    font-size: 16px;
}

.footer-bottom {
    border-top: 1px solid var(--iys-gray-medium);
    padding-top: 24px;
    text-align: center;
    color: var(--iys-black);
    font-size: 14px;
}


/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

/* Tablets y móviles grandes */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }

    .nav-container {
        padding: 16px 20px;
    }

    .nav-menu {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hero-container {
        padding: 0 20px;
    }

    .hero-title {
        font-size: 58px;
        margin-bottom: 32px;
    }

    .hero-subtitle {
        font-size: 24px;
        margin-bottom: 48px;
    }

    .hero-cta {
        flex-direction: column;
        gap: 16px;
        margin-top: 32px;
    }

    .hero-separator {
        display: none;
    }

    .section-title {
        font-size: 44px;
    }

    .servicio-card {
        padding: 32px;
    }

    .servicio-card h3 {
        font-size: 29px;
    }

    /* Estilos responsive para marquee */
    .marquee-content {
        gap: 50px;
    }

    .client-text {
        font-size: 27px;
    }

    .contacto-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .contacto .section-title {
        text-align: center;
    }

    .contacto-texto {
        padding-top: 0;
        text-align: center;
    }

    .contacto-form {
        max-width: 100%;
        padding: 0 20px;
    }

    .form-row {
        flex-direction: column;
        gap: 16px;
    }

    .form-row .form-group {
        flex: none;
        width: 100%;
    }

    .btn {
        width: 100%;
        min-width: auto;
        padding: 16px 20px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
        gap: 32px;
    }

    .hero-illustration {
        width: 240px;
        height: 240px;
    }

    .hero-illustration i {
        font-size: 80px;
    }

    /* Estilos del menú mobile */
    .nav-menu.active {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--iys-white);
        padding: 1rem 0;
        border-top: 1px solid var(--iys-gray-medium);
    }

    .nav-menu.active li {
        list-style: none;
        padding: 0;
    }

    .nav-menu.active a {
        display: block;
        padding: 15px 20px;
        color: var(--iys-black);
        text-decoration: none;
        transition: var(--iys-transition);
        border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    }

    .nav-menu.active a:hover {
        background: rgba(0, 0, 0, 0.05);
    }

    /* Animación de hamburguesa a cruz con valores simétricos */
    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .hamburger.active span:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    /* Modo oscuro para menú mobile */
    [data-theme="dark"] .nav-menu.active {
        background: var(--iys-gray-light);
        border-top: 1px solid var(--iys-gray-medium);
    }

    [data-theme="dark"] .nav-menu.active a {
        color: var(--iys-black);
        border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    }

    [data-theme="dark"] .nav-menu.active a:hover {
        background: rgba(255, 255, 255, 0.1);
    }

    /* Optimizaciones para sección "Por qué elegirnos" en mobile */
    .footer-logo h4 {
        margin: 16px 0 8px 0;
    }

    .footer-logo ul li {
        padding-left: 20px;
    }
}

/* Móviles pequeños */
@media (max-width: 480px) {
    .hero-title {
        font-size: 44px;
        margin-bottom: 24px;
    }

    .hero-subtitle {
        font-size: 22px;
        margin-bottom: 32px;
    }

    .hero-cta {
        font-size: 14px;
    }

    .section-title {
        font-size: 34px;
    }

    .servicio-card {
        padding: 24px;
    }
}

/* ========================================
   ANIMACIONES Y EFECTOS
   ======================================== */

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

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

.fade-in-element {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s cubic-bezier(0.4, 0, 0.2, 1), transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* Scroll suave */
html {
    scroll-behavior: smooth;
}

/* Botones CTA estilo Apple */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 25px;
    font-size: 17px;
    font-weight: 400;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
    letter-spacing: -0.022em;
    line-height: 1.2;
    min-height: 44px;
    box-sizing: border-box;
}

.btn-primary-apple {
    background: var(--iys-black);
    color: var(--iys-white);
    border: 2px solid var(--iys-black);
    font-weight: 600;
}

.btn-primary-apple:hover {
    background: var(--iys-white);
    border-color: var(--iys-white);
    color: var(--iys-black);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Modo oscuro para botón primario */
[data-theme="dark"] .btn-primary-apple:hover {
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.15);
}

.btn-tertiary-apple {
    background: transparent;
    color: var(--iys-black);
    border: 2px solid var(--iys-black);
    font-weight: 400;
}

.btn-tertiary-apple:hover {
    background: var(--iys-black);
    color: var(--iys-white);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* Modo oscuro para botón terciario */
[data-theme="dark"] .btn-tertiary-apple:hover {
    box-shadow: 0 4px 12px rgba(255, 255, 255, 0.15);
}

/* Responsive para botones CTA */
@media (max-width: 768px) {
    .btn {
        padding: 14px 20px;
        font-size: 16px;
        min-height: 48px;
    }

    .hero-cta {
        flex-direction: column;
        gap: 16px;
        align-items: center;
    }
}

/* Efectos de cambio de fondo dinámico */
body.bg-transition {
    transition: var(--iys-transition-bg);
}

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

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

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

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