/* ===== CSS Variables ===== */
:root {
  /* Brand Colors */
  --color-background: #ECF0F3;
  --color-primary: #E95817;
  --color-secondary: #083762;
  --color-base: #FFFFFF;
  --color-text-primary: #083762;
  --color-text-secondary: #4A5568;
  --color-text-light: #718096;
  
  /* Typography */
  --font-family: 'Montserrat', sans-serif;
  --font-weight-light: 300;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-bold: 700;
  --font-weight-black: 900;
  
  /* Font Sizes (Mobile First) */
  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-base: 1rem;    /* 16px */
  --font-size-lg: 1.125rem;  /* 18px */
  --font-size-xl: 1.25rem;   /* 20px */
  --font-size-2xl: 1.5rem;   /* 24px */
  --font-size-3xl: 1.875rem; /* 30px */
  --font-size-4xl: 2.25rem;  /* 36px */
  --font-size-5xl: 3rem;     /* 48px */
  
  /* Spacing */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  --spacing-4xl: 6rem;     /* 96px */
  
  /* Border Radius */
  --radius-sm: 0.25rem;    /* 4px */
  --radius-md: 0.5rem;     /* 8px */
  --radius-lg: 0.75rem;    /* 12px */
  --radius-xl: 1rem;       /* 16px */
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-normal: 300ms ease-in-out;
  --transition-slow: 500ms ease-in-out;
  
  /* Breakpoints */
  --bp-tablet: 768px;
  --bp-desktop: 1024px;
  --bp-large: 1440px;
  
  /* Container Max Widths */
  --container-sm: 100%;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-weight: var(--font-weight-regular);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text-secondary);
  background-color: var(--color-background);
  overflow-x: hidden;
}

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

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

ul {
  list-style: none;
}

button {
  border: none;
  background: none;
  font-family: inherit;
  cursor: pointer;
  transition: all var(--transition-fast);
}

/* ===== Container ===== */
.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

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

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--spacing-2xl);
  }
}

/* ===== Section ===== */
.section {
  padding: var(--spacing-3xl) 0;
}

@media (min-width: 768px) {
  .section {
    padding: var(--spacing-4xl) 0;
  }
}

.section__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-align: center;
  margin-bottom: var(--spacing-2xl);
  line-height: 1.2;
}

@media (min-width: 768px) {
  .section__title {
    font-size: var(--font-size-4xl);
    margin-bottom: var(--spacing-3xl);
  }
}

@media (min-width: 1024px) {
  .section__title {
    font-size: var(--font-size-5xl);
  }
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-medium);
  font-size: var(--font-size-base);
  text-align: center;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: 2px solid transparent;
  min-height: 48px; /* Accessibility: minimum touch target */
  text-decoration: none;
}

.btn--primary {
  background-color: var(--color-primary);
  color: var(--color-base);
  border-color: var(--color-primary);
}

.btn--primary:hover,
.btn--primary:focus {
  background-color: #d14912;
  border-color: #d14912;
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn--secondary {
  background-color: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}

.btn--secondary:hover,
.btn--secondary:focus {
  background-color: var(--color-primary);
  color: var(--color-base);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

@media (min-width: 768px) {
  .btn {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--font-size-lg);
  }
}

/* ===== Header & Navigation ===== */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: all var(--transition-fast);
  border-bottom: 1px solid rgba(8, 55, 98, 0.1);
}

.header.scrolled {
  box-shadow: var(--shadow-md);
}

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

.nav__logo-img {
  height: 40px;
  width: auto;
}

.nav__menu {
  position: fixed;
  top: 80px;
  left: 0;
  right: 0;
  background-color: var(--color-base);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-lg);
}

.nav__menu.active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.nav__list {
  display: flex;
  flex-direction: column;
  padding: var(--spacing-xl);
  gap: var(--spacing-lg);
}

.nav__link {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
}

.nav__link:hover,
.nav__link:focus {
  background-color: var(--color-background);
  color: var(--color-primary);
}

.nav__cta {
  background-color: var(--color-primary);
  color: var(--color-base) !important;
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-lg);
}

.nav__cta:hover,
.nav__cta:focus {
  background-color: #d14912 !important;
  transform: translateY(-2px);
}

.nav__toggle {
  display: flex;
  flex-direction: column;
  width: 30px;
  height: 30px;
  cursor: pointer;
  gap: 4px;
  align-items: center;
  justify-content: center;
}

.nav__toggle span {
  width: 25px;
  height: 3px;
  background-color: var(--color-text-primary);
  transition: all var(--transition-fast);
  border-radius: 2px;
}

.nav__toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

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

.nav__toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(7px, -6px);
}

@media (min-width: 768px) {
  .nav__menu {
    position: static;
    transform: none;
    opacity: 1;
    visibility: visible;
    background-color: transparent;
    box-shadow: none;
  }
  
  .nav__list {
    flex-direction: row;
    padding: 0;
    align-items: center;
  }
  
  .nav__toggle {
    display: none;
  }
}

/* ===== Hero Section ===== */
.hero {
  padding-top: calc(80px + var(--spacing-3xl));
  background: linear-gradient(135deg, var(--color-background) 0%, #f7fafc 100%);
  min-height: 100vh;
  display: flex;
  align-items: center;
}

.hero__container {
  display: grid;
  gap: var(--spacing-3xl);
  align-items: center;
}

.hero__content {
  text-align: center;
}

.hero__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-black);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-3xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__pillars {
  display: grid;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.pillar {
  text-align: center;
  padding: var(--spacing-xl);
  background-color: var(--color-base);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.pillar:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.pillar__icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
}

.pillar__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
}

.pillar__description {
  color: var(--color-text-secondary);
}

.hero__cta {
  margin-top: var(--spacing-xl);
}

.hero__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.network-animation {
  width: 100%;
  max-width: 400px;
}

.network-svg {
  width: 100%;
  height: auto;
}

.node {
  fill: var(--color-primary);
  stroke: var(--color-base);
  stroke-width: 3;
  animation: pulse 2s ease-in-out infinite;
}

.connection {
  stroke: var(--color-secondary);
  stroke-width: 2;
  opacity: 0.6;
  stroke-dasharray: 5, 5;
  animation: dash 3s linear infinite;
}

@keyframes pulse {
  0%, 100% { r: 8; opacity: 1; }
  50% { r: 12; opacity: 0.7; }
}

@keyframes dash {
  to { stroke-dashoffset: -20; }
}

@media (min-width: 768px) {
  .hero__container {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
  }
  
  .hero__content {
    text-align: left;
  }
  
  .hero__title {
    font-size: var(--font-size-5xl);
  }
  
  .hero__subtitle {
    font-size: var(--font-size-xl);
    margin-left: 0;
    margin-right: 0;
  }
  
  .hero__pillars {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 1024px) {
  .hero__pillars {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== Problem Section ===== */
.problem {
  background-color: var(--color-base);
}

.problem__grid {
  display: grid;
  gap: var(--spacing-xl);
}

.problem__item {
  text-align: center;
  padding: var(--spacing-xl);
  border-radius: var(--radius-xl);
  background-color: var(--color-background);
  transition: all var(--transition-normal);
}

.problem__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.problem__icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
}

.problem__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.problem__description {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

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

@media (min-width: 1024px) {
  .problem__grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ===== Solutions Section ===== */
.solutions {
  background-color: var(--color-background);
}

.solutions__grid {
  display: grid;
  gap: var(--spacing-xl);
}

.solution__card {
  background-color: var(--color-base);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  height: 100%;
}

.solution__card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.solution__icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
}

.solution__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.solution__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

.solution__features {
  list-style: none;
}

.solution__features li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.solution__features li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

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

@media (min-width: 1024px) {
  .solutions__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== How It Works Section ===== */
.how-it-works {
  background-color: var(--color-base);
}

.timeline {
  max-width: 800px;
  margin: 0 auto;
}

.timeline__item {
  display: flex;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
  position: relative;
}

.timeline__item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 20px;
  top: 60px;
  bottom: -48px;
  width: 2px;
  background-color: var(--color-primary);
  opacity: 0.3;
}

.timeline__number {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background-color: var(--color-primary);
  color: var(--color-base);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
  box-shadow: var(--shadow-md);
}

.timeline__content {
  flex: 1;
}

.timeline__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.timeline__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

.timeline__code {
  background-color: var(--color-secondary);
  color: var(--color-base);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  font-family: 'Courier New', monospace;
  font-size: var(--font-size-sm);
  overflow-x: auto;
}

@media (min-width: 768px) {
  .timeline__item {
    gap: var(--spacing-2xl);
  }
  
  .timeline__number {
    width: 50px;
    height: 50px;
    font-size: var(--font-size-xl);
  }
  
  .timeline__item:not(:last-child)::after {
    left: 24px;
    top: 70px;
  }
}

/* ===== Use Cases Section ===== */
.use-cases {
  background-color: var(--color-background);
}

.use-cases__grid {
  display: grid;
  gap: var(--spacing-xl);
}

.use-case__card {
  background-color: var(--color-base);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
}

.use-case__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.use-case__card .use-case__icon {
  font-size: var(--font-size-3xl);
  padding: var(--spacing-xl);
  background-color: var(--color-background);
  text-align: center;
}

.use-case__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  padding: 0 var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.use-case__content {
  padding: 0 var(--spacing-xl) var(--spacing-xl);
}

.use-case__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

.use-case__scenario h4 {
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.use-case__scenario ul {
  list-style: none;
}

.use-case__scenario li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.use-case__scenario li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
}

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

/* ===== Technology Section ===== */
.technology {
  background-color: var(--color-base);
}

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

.technology__subtitle {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.standards__grid {
  display: grid;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-3xl);
}

.standard__item {
  text-align: center;
  padding: var(--spacing-xl);
  background-color: var(--color-background);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
}

.standard__item:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.standard__icon {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
}

.standard__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.standard__description {
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.security__features {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-3xl);
}

.security__feature {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-lg);
  background-color: var(--color-background);
  border-radius: var(--radius-lg);
}

.security__icon {
  font-size: var(--font-size-xl);
  flex-shrink: 0;
}

.security__text {
  color: var(--color-text-secondary);
  font-weight: var(--font-weight-medium);
}

.compliance__items {
  display: grid;
  gap: var(--spacing-lg);
}

.compliance__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-lg);
  padding: var(--spacing-lg);
  background-color: var(--color-background);
  border-radius: var(--radius-lg);
}

.compliance__badge {
  background-color: var(--color-primary);
  color: var(--color-base);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  flex-shrink: 0;
}

.compliance__item p {
  color: var(--color-text-secondary);
  margin: 0;
}

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

@media (min-width: 1024px) {
  .standards__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== Benefits Section ===== */
.benefits {
  background-color: var(--color-background);
}

.benefits__grid {
  display: grid;
  gap: var(--spacing-xl);
}

.benefit__card {
  background-color: var(--color-base);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  height: 100%;
}

.benefit__card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.benefit__icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-lg);
}

.benefit__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-md);
}

.benefit__description {
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

.benefit__list {
  list-style: none;
}

.benefit__list li {
  position: relative;
  padding-left: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
  color: var(--color-text-secondary);
}

.benefit__list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: var(--color-primary);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
}

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

@media (min-width: 1024px) {
  .benefits__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* ===== Trust Section ===== */
.trust {
  background-color: var(--color-base);
}

.trust__content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
}

.trust__subtitle {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-xl);
}

.standards__badges {
  display: grid;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-3xl);
}

.badge {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-md);
  padding: var(--spacing-xl);
  background-color: var(--color-background);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal);
}

.badge:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.badge__img {
  width: 60px;
  height: 60px;
  object-fit: contain;
}

.badge__text {
  font-weight: var(--font-weight-medium);
  color: var(--color-text-primary);
}

.partners__placeholder,
.testimonials__placeholder {
  padding: var(--spacing-3xl);
  background-color: var(--color-background);
  border-radius: var(--radius-xl);
  color: var(--color-text-light);
  font-style: italic;
}

@media (min-width: 768px) {
  .standards__badges {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ===== CTA Section ===== */
.cta {
  background: linear-gradient(135deg, var(--color-secondary) 0%, #0a4575 100%);
  color: var(--color-base);
  text-align: center;
}

.cta__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
}

.cta__subtitle {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-2xl);
  opacity: 0.9;
}

.cta__actions {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  align-items: center;
}

@media (min-width: 768px) {
  .cta__title {
    font-size: var(--font-size-4xl);
  }
  
  .cta__actions {
    flex-direction: row;
    justify-content: center;
  }
}

/* ===== Footer ===== */
.footer {
  background-color: var(--color-secondary);
  color: var(--color-base);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer__content {
  display: grid;
  gap: var(--spacing-3xl);
  margin-bottom: var(--spacing-3xl);
}

.footer__brand {
  text-align: center;
}

.footer__logo {
  height: 50px;
  width: auto;
  margin: 0 auto var(--spacing-lg);
}

.footer__description {
  opacity: 0.8;
  max-width: 300px;
  margin: 0 auto;
  line-height: 1.7;
}

.footer__links {
  display: grid;
  gap: var(--spacing-xl);
}

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

.footer__list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer__link {
  opacity: 0.8;
  transition: opacity var(--transition-fast);
}

.footer__link:hover,
.footer__link:focus {
  opacity: 1;
}

.footer__bottom {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  align-items: center;
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.footer__copyright {
  opacity: 0.7;
  font-size: var(--font-size-sm);
}

.footer__social {
  display: flex;
  gap: var(--spacing-lg);
}

.social__link {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  transition: all var(--transition-fast);
}

.social__link:hover,
.social__link:focus {
  background-color: var(--color-primary);
  transform: translateY(-2px);
}

@media (min-width: 768px) {
  .footer__content {
    grid-template-columns: 1fr 2fr;
    align-items: start;
  }
  
  .footer__brand {
    text-align: left;
  }
  
  .footer__logo {
    margin-left: 0;
  }
  
  .footer__description {
    margin: 0;
  }
  
  .footer__links {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
  }
}

/* ===== Modal ===== */
.modal {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

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

.modal__overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(5px);
}

.modal__content {
  position: relative;
  background-color: var(--color-base);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  transform: scale(0.8);
  transition: transform var(--transition-normal);
}

.modal.active .modal__content {
  transform: scale(1);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-xl);
  border-bottom: 1px solid var(--color-background);
}

.modal__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
}

.modal__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--color-background);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.modal__close:hover,
.modal__close:focus {
  background-color: var(--color-primary);
  color: var(--color-base);
}

.modal__body {
  padding: var(--spacing-xl);
}

.modal__description {
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--spacing-lg);
}

.placeholder-form {
  background-color: var(--color-background);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid var(--color-primary);
}

.placeholder-form strong {
  color: var(--color-text-primary);
}

.placeholder-form ul {
  margin: var(--spacing-md) 0;
  padding-left: var(--spacing-lg);
}

.placeholder-form li {
  list-style: disc;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-xs);
}

/* ===== Animations ===== */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes fadeInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

/* Animation classes for JavaScript */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease-out;
}

.animate-on-scroll.animate {
  opacity: 1;
  transform: translateY(0);
}

.animate-on-scroll.animate-left {
  transform: translateX(0);
}

.animate-on-scroll.animate-right {
  transform: translateX(0);
}

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

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

.hidden { display: none; }
.visible { display: block; }

/* ===== Focus Styles for Accessibility ===== */
*:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

button:focus,
a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ===== Print Styles ===== */
@media print {
  .header,
  .nav__toggle,
  .modal,
  .footer__social {
    display: none;
  }
  
  .section {
    page-break-inside: avoid;
  }
  
  body {
    background: white;
    color: black;
  }
}