/**
 * Skyliorenth - Main Stylesheet
 * This stylesheet uses BEM methodology, mobile-first approach and CSS variables
 */

/* ===== Variables ===== */
:root {
  /* Colors */
  --color-background: #E6F0FA;
  --color-accent: #4A90E2;
  --color-accent-dark: #2E6DA4;
  --color-accent-light: #7FB5F5;
  --color-text: #333333;
  --color-text-light: #666666;
  --color-text-lighter: #999999;
  --color-white: #FFFFFF;
  --color-gray-100: #F8F9FA;
  --color-gray-200: #E9ECEF;
  --color-gray-300: #DEE2E6;
  --color-success: #28A745;
  --color-error: #DC3545;

  /* Typography */
  --font-body: 'Open Sans', sans-serif;
  --font-heading: 'Montserrat', sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  --spacing-4xl: 6rem;

  /* Borders */
  --border-radius: 0;
  --border-width: 1px;
  --border-width-thick: 2px;

  /* Shadows */
  --shadow-none: none;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;

  /* Z-index */
  --z-index-dropdown: 1000;
  --z-index-sticky: 1020;
  --z-index-fixed: 1030;
  --z-index-modal: 1040;
  --z-index-popover: 1050;
  --z-index-tooltip: 1060;

  /* Container widths */
  --container-max-width: 1200px;
  --container-padding: var(--spacing-md);

  /* Breakpoints */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
}

/* Dark mode variables */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #1A2238;
    --color-accent: #4A90E2;
    --color-accent-dark: #3A7AC4;
    --color-accent-light: #5FA6F6;
    --color-text: #F8F9FA;
    --color-text-light: #DEE2E6;
    --color-text-lighter: #ADB5BD;
    --color-white: #2A3450;
    --color-gray-100: #293249;
    --color-gray-200: #24293C;
    --color-gray-300: #1E2230;
  }
}

/* ===== Reset and Base Styles ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-background);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover, a:focus {
  color: var(--color-accent-dark);
  text-decoration: underline;
}

button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
}

ul, ol {
  list-style-position: inside;
}

/* ===== Accessibility ===== */
.skip-link {
  background-color: var(--color-accent);
  color: var(--color-white);
  font-weight: bold;
  left: 0;
  padding: var(--spacing-md);
  position: absolute;
  top: -100px;
  transition: top var(--transition-fast);
  z-index: var(--z-index-tooltip);
}

.skip-link:focus {
  top: 0;
}

.keyboard-user :focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* For screen readers only */
.sr-only {
  border: 0;
  clip: rect(0, 0, 0, 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  white-space: nowrap;
  width: 1px;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

.reduce-motion * {
  animation-duration: 0.01ms !important;
  animation-iteration-count: 1 !important;
  transition-duration: 0.01ms !important;
  scroll-behavior: auto !important;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: var(--line-height-tight);
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: var(--font-size-3xl);
}

h2 {
  font-size: var(--font-size-2xl);
}

h3 {
  font-size: var(--font-size-xl);
}

h4 {
  font-size: var(--font-size-lg);
}

p {
  margin-bottom: var(--spacing-md);
}

.text-center {
  text-align: center;
}

/* ===== Buttons ===== */
.button {
  align-items: center;
  border: var(--border-width) solid transparent;
  display: inline-flex;
  font-family: var(--font-heading);
  font-size: var(--font-size-base);
  font-weight: 700;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  text-align: center;
  text-decoration: none;
  transition: background-color var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

.button--primary {
  background-color: var(--color-accent);
  color: var(--color-white);
}

.button--primary:hover, .button--primary:focus {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
  text-decoration: none;
}

.button--secondary {
  background-color: transparent;
  border-color: var(--color-accent);
  color: var(--color-accent);
}

.button--secondary:hover, .button--secondary:focus {
  background-color: var(--color-accent);
  color: var(--color-white);
  text-decoration: none;
}

/* ===== Layout ===== */
.section {
  padding: var(--spacing-2xl) 0;
}

.section--alt {
  background-color: var(--color-white);
}

.hero__container, 
.section__container, 
.header__container, 
.footer__container,
.legal-page__container,
.success-page__container {
  margin: 0 auto;
  max-width: var(--container-max-width);
  padding: 0 var(--container-padding);
  width: 100%;
}

.section__title {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.section__content {
  margin-bottom: var(--spacing-xl);
}

.section__media {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

/* Grid */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid--advantages {
  grid-template-columns: 1fr;
}

@media (min-width: 576px) {
  .grid--advantages {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .grid--advantages {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== Header ===== */
.header {
  background-color: var(--color-white);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  position: sticky;
  top: 0;
  width: 100%;
  z-index: var(--z-index-sticky);
}

.header__container {
  align-items: center;
  display: flex;
  height: 80px;
  justify-content: space-between;
}

.header__logo {
  display: block;
  margin-right: var(--spacing-md);
}

/* ===== Navigation ===== */
.nav__toggle {
  align-items: center;
  display: flex;
  height: 40px;
  justify-content: center;
  width: 40px;
}

.nav__toggle .material-icons {
  color: var(--color-text);
  font-size: var(--font-size-2xl);
}

.nav__menu {
  background-color: var(--color-white);
  display: none;
  flex-direction: column;
  left: 0;
  padding: var(--spacing-md);
  position: absolute;
  top: 80px;
  width: 100%;
}

.nav__menu--active {
  display: flex;
}

.nav__item {
  list-style: none;
  margin-bottom: var(--spacing-md);
}

.nav__link {
  color: var(--color-text);
  display: block;
  font-family: var(--font-heading);
  font-size: var(--font-size-base);
  font-weight: 700;
  padding: var(--spacing-sm) 0;
  transition: color var(--transition-fast);
}

.nav__link:hover, .nav__link:focus {
  color: var(--color-accent);
  text-decoration: none;
}

.nav__link--accent {
  color: var(--color-accent);
}

.nav__link--accent:hover, .nav__link--accent:focus {
  color: var(--color-accent-dark);
}

@media (min-width: 768px) {
  .nav__toggle {
    display: none;
  }
  
  .nav__menu {
    background-color: transparent;
    display: flex;
    flex-direction: row;
    position: static;
    padding: 0;
    width: auto;
  }
  
  .nav__item {
    margin-bottom: 0;
    margin-left: var(--spacing-lg);
  }
  
  .nav__link {
    padding: var(--spacing-sm);
  }
}

/* ===== Hero Section ===== */
.hero {
  background-color: var(--color-white);
  padding: var(--spacing-2xl) 0;
}

.hero__container {
  align-items: center;
  display: flex;
  flex-direction: column;
}

.hero__content {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.hero__title {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
}

.hero__subtitle {
  color: var(--color-text-light);
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-lg);
}

.hero__image {
  max-width: 100%;
}

.hero__image img {
  border-radius: var(--border-radius);
  max-width: 100%;
}

@media (min-width: 992px) {
  .hero__container {
    flex-direction: row;
    justify-content: space-between;
  }
  
  .hero__content {
    flex: 1;
    margin-bottom: 0;
    margin-right: var(--spacing-2xl);
    text-align: left;
  }
  
  .hero__image {
    flex: 1;
  }
}

/* ===== Cards ===== */
.card {
  background-color: var(--color-white);
  border-radius: var(--border-radius);
  opacity: 0;
  padding: var(--spacing-lg);
  text-align: center;
  transform: translateY(20px);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.card.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.card__icon {
  color: var(--color-accent);
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.card__title {
  color: var(--color-accent-dark);
  margin-bottom: var(--spacing-md);
}

.card__text {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* ===== Timeline ===== */
.timeline {
  margin: var(--spacing-xl) 0;
}

.timeline__item {
  display: flex;
  margin-bottom: var(--spacing-lg);
  opacity: 0;
  transform: translateX(-20px);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.timeline__item.animate-in {
  opacity: 1;
  transform: translateX(0);
}

.timeline__number {
  align-items: center;
  background-color: var(--color-accent);
  border-radius: 50%;
  color: var(--color-white);
  display: flex;
  flex-shrink: 0;
  font-family: var(--font-heading);
  font-size: var(--font-size-lg);
  font-weight: 700;
  height: 40px;
  justify-content: center;
  margin-right: var(--spacing-md);
  width: 40px;
}

.timeline__content {
  flex: 1;
}

.timeline__title {
  color: var(--color-accent-dark);
  margin-bottom: var(--spacing-sm);
}

.timeline__text {
  color: var(--color-text-light);
  margin-bottom: 0;
}

/* Horizontal timeline for success page */
.timeline--horizontal {
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .timeline--horizontal {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .timeline--horizontal {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .timeline--horizontal .timeline__item {
    flex-direction: column;
    text-align: center;
  }
  
  .timeline--horizontal .timeline__number {
    margin: 0 auto var(--spacing-md);
  }
}

/* ===== Testimonials ===== */
.testimonials {
  margin: var(--spacing-xl) 0;
}

.testimonial {
  background-color: var(--color-white);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--border-radius);
  display: none;
  margin-bottom: var(--spacing-lg);
  opacity: 0;
  padding: var(--spacing-lg);
  transform: translateY(20px);
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

.testimonial.animate-in {
  opacity: 1;
  transform: translateY(0);
}

.testimonial--active {
  display: block;
}

.testimonial__content {
  margin-bottom: var(--spacing-md);
}

.testimonial__content p {
  color: var(--color-text-light);
  font-style: italic;
  margin-bottom: 0;
}

.testimonial__author {
  align-items: center;
  display: flex;
}

.testimonial__image {
  border-radius: 50%;
  height: 60px;
  margin-right: var(--spacing-md);
  object-fit: cover;
  width: 60px;
}

.testimonial__name {
  font-size: var(--font-size-base);
  margin-bottom: var(--spacing-xs);
}

.testimonial__role {
  color: var(--color-text-lighter);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

@media (min-width: 768px) {
  .testimonials {
    display: grid;
    gap: var(--spacing-lg);
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  }
  
  .testimonial {
    display: block;
    height: 100%;
  }
}

/* ===== Accordion ===== */
.accordion {
  margin: var(--spacing-xl) 0;
}

.accordion__item {
  border-bottom: var(--border-width) solid var(--color-gray-200);
  margin-bottom: var(--spacing-md);
}

.accordion__button {
  align-items: center;
  background-color: transparent;
  color: var(--color-text);
  cursor: pointer;
  display: flex;
  font-family: var(--font-heading);
  font-size: var(--font-size-lg);
  font-weight: 700;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
  text-align: left;
  width: 100%;
}

.accordion__button .material-icons {
  color: var(--color-accent);
  transition: transform var(--transition-fast);
}

.accordion__button[aria-expanded="true"] .material-icons {
  transform: rotate(180deg);
}

.accordion__content {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-normal);
}

.accordion__content p {
  color: var(--color-text-light);
  padding-bottom: var(--spacing-md);
}

/* ===== Contact ===== */
.contact {
  display: grid;
  gap: var(--spacing-xl);
  grid-template-columns: 1fr;
}

.contact__info {
  margin-bottom: var(--spacing-lg);
}

.contact__details {
  margin-top: var(--spacing-lg);
}

.contact__item {
  align-items: flex-start;
  display: flex;
  margin-bottom: var(--spacing-md);
}

.contact__item .material-icons {
  color: var(--color-accent);
  margin-right: var(--spacing-md);
  margin-top: var(--spacing-xs);
}

.contact__item p {
  margin-bottom: 0;
}

@media (min-width: 768px) {
  .contact {
    grid-template-columns: 1fr 1fr;
  }
}

/* ===== Form ===== */
.form__group {
  margin-bottom: var(--spacing-md);
}

.form__label {
  display: block;
  font-weight: bold;
  margin-bottom: var(--spacing-sm);
}

.form__input {
  background-color: var(--color-gray-100);
  border: var(--border-width) solid var(--color-gray-300);
  border-radius: var(--border-radius);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  padding: var(--spacing-md);
  transition: border-color var(--transition-fast);
  width: 100%;
}

.form__input:focus {
  border-color: var(--color-accent);
  outline: none;
}

.form__input[aria-invalid="true"] {
  border-color: var(--color-error);
}

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

.form__error {
  color: var(--color-error);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-xs);
  min-height: 20px;
}

.form__group--checkbox {
  align-items: flex-start;
  display: flex;
}

.form__checkbox {
  margin-right: var(--spacing-sm);
  margin-top: var(--spacing-xs);
}

.form__checkbox-label {
  font-weight: normal;
}

.form__submit {
  margin-top: var(--spacing-md);
}

/* ===== Footer ===== */
.footer {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
  padding: var(--spacing-2xl) 0 var(--spacing-lg);
  position: relative;
}

.footer__container {
  display: grid;
  gap: var(--spacing-xl);
  grid-template-columns: 1fr;
}

.footer__column {
  margin-bottom: var(--spacing-lg);
}

.footer__logo {
  display: block;
  margin-bottom: var(--spacing-md);
}

.footer__tagline {
  font-style: italic;
  margin-bottom: var(--spacing-md);
}

.footer__social {
  display: flex;
}

.footer__social-link {
  align-items: center;
  background-color: var(--color-accent);
  border-radius: 50%;
  color: var(--color-white);
  display: flex;
  height: 40px;
  justify-content: center;
  margin-right: var(--spacing-md);
  transition: background-color var(--transition-fast);
  width: 40px;
}

.footer__social-link:hover, .footer__social-link:focus {
  background-color: var(--color-accent-light);
  color: var(--color-white);
  text-decoration: none;
}

.footer__title {
  color: var(--color-white);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-md);
}

.footer__links {
  list-style: none;
}

.footer__links li {
  margin-bottom: var(--spacing-sm);
}

.footer__links a {
  color: var(--color-gray-200);
  transition: color var(--transition-fast);
}

.footer__links a:hover, .footer__links a:focus {
  color: var(--color-white);
  text-decoration: none;
}

.footer__links a[aria-current="page"] {
  color: var(--color-white);
  font-weight: bold;
}

.footer__address {
  font-style: normal;
}

.footer__address p {
  margin-bottom: var(--spacing-sm);
}

.footer__address a {
  color: var(--color-gray-200);
}

.footer__address a:hover, .footer__address a:focus {
  color: var(--color-white);
}

.footer__bottom {
  border-top: var(--border-width) solid rgba(255, 255, 255, 0.1);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  text-align: center;
}

.footer__copyright {
  color: var(--color-gray-300);
  font-size: var(--font-size-sm);
  margin-bottom: 0;
}

.back-to-top {
  align-items: center;
  background-color: var(--color-accent);
  border-radius: 50%;
  bottom: var(--spacing-lg);
  color: var(--color-white);
  display: flex;
  height: 50px;
  justify-content: center;
  opacity: 0;
  position: fixed;
  right: var(--spacing-lg);
  transition: background-color var(--transition-fast), opacity var(--transition-fast);
  visibility: hidden;
  width: 50px;
  z-index: var(--z-index-fixed);
}

.back-to-top--visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover, .back-to-top:focus {
  background-color: var(--color-accent-dark);
  color: var(--color-white);
}

@media (min-width: 576px) {
  .footer__container {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .footer__container {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== Legal Pages ===== */
.legal-page {
  padding: var(--spacing-2xl) 0;
}

.legal-page__title {
  margin-bottom: var(--spacing-xl);
  text-align: center;
}

.legal-page__content {
  margin-bottom: var(--spacing-xl);
}

.legal-section {
  margin-bottom: var(--spacing-xl);
}

.legal-section__title {
  color: var(--color-accent-dark);
  margin-bottom: var(--spacing-md);
}

.legal-section h3 {
  color: var(--color-text);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-sm);
  margin-top: var(--spacing-lg);
}

.legal-section ul, .legal-section ol {
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

.legal-section li {
  margin-bottom: var(--spacing-sm);
}

.legal-page__date {
  border-top: var(--border-width) solid var(--color-gray-200);
  color: var(--color-text-light);
  font-style: italic;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-md);
  text-align: right;
}

.legal-page__nav {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-xl);
}

/* ===== Success Page ===== */
.success-page {
  padding: var(--spacing-3xl) 0;
  text-align: center;
}

.success-page__icon {
  color: var(--color-success);
  font-size: 4rem;
  margin-bottom: var(--spacing-lg);
}

.success-page__icon .material-icons {
  font-size: 4rem;
}

.success-page__title {
  color: var(--color-accent-dark);
  margin-bottom: var(--spacing-lg);
}

.success-page__message {
  margin: 0 auto var(--spacing-xl);
  max-width: 700px;
}

.success-page__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  justify-content: center;
  margin-bottom: var(--spacing-2xl);
}

.success-page__next {
  margin-top: var(--spacing-2xl);
}

.success-page__next h2 {
  margin-bottom: var(--spacing-lg);
}

/* ===== Animations ===== */
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

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

/* ===== Media Queries ===== */
@media (min-width: 576px) {
  :root {
    --container-padding: var(--spacing-lg);
  }
  
  h1 {
    font-size: var(--font-size-4xl);
  }
  
  h2 {
    font-size: var(--font-size-3xl);
  }
  
  h3 {
    font-size: var(--font-size-2xl);
  }
}

@media (min-width: 768px) {
  :root {
    --container-padding: var(--spacing-xl);
  }
  
  .section__content {
    margin-bottom: 0;
  }
  
  .section__media {
    margin-bottom: 0;
  }
}

@media (min-width: 992px) {
  .section {
    padding: var(--spacing-3xl) 0;
  }
}

@media (min-width: 1200px) {
  .section {
    padding: var(--spacing-4xl) 0;
  }
}

.about__container {
  align-items: center;
  display: grid;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .about__container {
    grid-template-columns: repeat(2, 1fr);
  }
}