/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;500;600;700;800&family=Work+Sans:wght@300;400;500;600&display=swap');

/* Variables */
:root {
  /* Colors */
  --color-bg: #FFFFFF;
  --color-accent: #E63946;
  --color-secondary: #F1FAEE;
  --color-text: #1D3557;
  --color-text-light: #457B9D;
  --color-button: #E63946;
  --color-button-hover: #c62b38;
  --color-border: #ddd;
  --color-error: #E63946;
  --color-success: #2ecc71;

  /* Typography */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Work Sans', sans-serif;
  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-base: 1rem;    /* 16px */
  --font-size-md: 1.125rem;  /* 18px */
  --font-size-lg: 1.25rem;   /* 20px */
  --font-size-xl: 1.5rem;    /* 24px */
  --font-size-2xl: 2rem;     /* 32px */
  --font-size-3xl: 2.5rem;   /* 40px */
  --font-size-4xl: 3rem;     /* 48px */
  
  /* Spacing */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */
  
  /* Borders */
  --border-radius: 0;    /* Sharp corners as specified */
  
  /* Transitions */
  --transition-fast: 0.2s ease;
  --transition-medium: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Breakpoints */
  --breakpoint-sm: 576px;
  --breakpoint-md: 768px;
  --breakpoint-lg: 992px;
  --breakpoint-xl: 1200px;
  
  /* Container widths */
  --container-max-width: 1200px;
  --container-padding: var(--space-md);
}

/* Base Styles */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  font-size: 100%;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: 1.6;
  margin: 0;
  overflow-x: hidden;
  padding: 0;
}

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

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

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  margin-top: 0;
}

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

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

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

p {
  margin-bottom: var(--space-md);
  margin-top: 0;
}

ul, ol {
  margin-bottom: var(--space-md);
  margin-top: 0;
  padding-left: var(--space-xl);
}

button {
  background: none;
  border: none;
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  padding: 0;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
}

/* Accessibility */
.skip-to-content {
  background-color: var(--color-accent);
  color: var(--color-bg);
  left: 0;
  padding: var(--space-sm) var(--space-md);
  position: absolute;
  top: -100px;
  transition: top var(--transition-fast);
  z-index: 1000;
}

.skip-to-content:focus {
  top: 0;
}

/* Container */
.header__container,
.hero__container,
.heart-health__container,
.programs__container,
.use-cases__container,
.tracker__container,
.testimonials__container,
.benefits__container,
.faq__container,
.contact__container,
.footer__container {
  margin-left: auto;
  margin-right: auto;
  max-width: var(--container-max-width);
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
  width: 100%;
}

/* Section styles */
.section-title {
  margin-bottom: var(--space-xl);
  position: relative;
  text-align: center;
}

.section-title::after {
  background-color: var(--color-accent);
  bottom: -10px;
  content: '';
  height: 3px;
  left: 50%;
  position: absolute;
  transform: translateX(-50%);
  width: 60px;
}

/* Header */
.header {
  background-color: var(--color-bg);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  left: 0;
  position: fixed;
  right: 0;
  top: 0;
  z-index: 100;
}

.header__container {
  align-items: center;
  display: flex;
  justify-content: space-between;
  padding-bottom: var(--space-md);
  padding-top: var(--space-md);
}

.header__logo {
  display: block;
  height: 40px;
  width: auto;
}

.header__logo img {
  height: 100%;
  width: auto;
}

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

.header__menu {
  display: none;
  list-style: none;
  margin: 0;
  padding: 0;
}

.header__menu-item {
  margin-left: var(--space-lg);
}

.header__menu-link {
  color: var(--color-text);
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-transform: uppercase;
}

.header__menu-link:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.header__menu-link--cta {
  background-color: var(--color-button);
  border-radius: var(--border-radius);
  color: var(--color-bg);
  padding: var(--space-sm) var(--space-md);
}

.header__menu-link--cta:hover {
  background-color: var(--color-button-hover);
  color: var(--color-bg);
}

.header__mobile-toggle {
  display: flex;
  flex-direction: column;
  height: 24px;
  justify-content: space-between;
  width: 30px;
}

.header__mobile-bar {
  background-color: var(--color-text);
  height: 3px;
  transition: transform var(--transition-medium);
  width: 100%;
}

.mobile-menu {
  display: none;
}

.mobile-menu--active {
  background-color: var(--color-bg);
  bottom: 0;
  display: block;
  left: 0;
  padding: 1rem 0;
  position: fixed;
  right: 0;
  top: 75px;
  z-index: 10;
}

.mobile-menu--active .header__menu {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

/* Hero Section */
.hero {
  background-color: var(--color-secondary);
  margin-top: 76px;
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

.hero__container {
  display: flex;
  flex-direction: column;
}

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

.hero__title {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--space-md);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero__subtitle {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero__cta {
  background-color: var(--color-button);
  border-radius: var(--border-radius);
  color: var(--color-bg);
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--font-size-md);
  font-weight: 600;
  padding: var(--space-md) var(--space-xl);
  text-transform: uppercase;
  transition: background-color var(--transition-fast);
}

.hero__cta:hover {
  background-color: var(--color-button-hover);
  color: var(--color-bg);
  text-decoration: none;
}

.hero__graphic {
  align-items: center;
  display: flex;
  justify-content: center;
  width: 100%;
}

.hero__animation {
  max-width: 100%;
  overflow: hidden;
  position: relative;
}

.hero__image {
  border-radius: var(--border-radius);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  display: block;
  max-width: 100%;
  width: 100%;
}

/* Why Heart Health Matters Section */
.heart-health {
  background-color: var(--color-bg);
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

.heart-health__grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: repeat(1, 1fr);
}

.heart-health__item {
  background-color: var(--color-secondary);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  text-align: center;
}

.heart-health__icon {
  align-items: center;
  background-color: var(--color-accent);
  border-radius: 50%;
  display: flex;
  height: 60px;
  justify-content: center;
  margin-bottom: var(--space-lg);
  margin-left: auto;
  margin-right: auto;
  width: 60px;
}

.heart-health__icon .icon {
  fill: var(--color-bg);
  height: 30px;
  width: 30px;
}

/* Programs Section */
.programs {
  background-color: var(--color-secondary);
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

.programs__grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: repeat(1, 1fr);
}

.programs__card {
  background-color: var(--color-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.programs__image {
  height: 300px;
  object-fit: cover;
  width: 100%;
}

.programs__content {
  padding: var(--space-xl);
}

.programs__title {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
}

.programs__description {
  margin-bottom: var(--space-md);
}

.programs__features {
  list-style-type: disc;
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.programs__cta {
  background-color: var(--color-button);
  border-radius: var(--border-radius);
  color: var(--color-bg);
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: var(--space-sm) var(--space-lg);
  text-transform: uppercase;
  transition: background-color var(--transition-fast);
}

.programs__cta:hover {
  background-color: var(--color-button-hover);
  color: var(--color-bg);
  text-decoration: none;
}

/* Use Cases Section */
.use-cases {
  background-color: var(--color-bg);
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

.use-cases__grid {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: repeat(1, 1fr);
}

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

.use-cases__image {
  border-radius: var(--border-radius);
  height: 200px;
  margin-bottom: var(--space-md);
  object-fit: cover;
  width: 100%;
}

/* Tracker Section */
.tracker {
  background-color: var(--color-secondary);
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

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

.tracker__info {
  margin-bottom: var(--space-xl);
}

.tracker__features {
  list-style-type: disc;
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.tracker__visual {
  background-color: var(--color-bg);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
}

.tracker__chart {
  width: 100%;
}

.tracker__chart-header {
  align-items: center;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.tracker__chart-controls {
  display: flex;
  margin-top: var(--space-md);
}

.tracker__chart-button {
  background-color: var(--color-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text);
  font-size: var(--font-size-sm);
  margin-left: var(--space-xs);
  padding: var(--space-xs) var(--space-sm);
}

.tracker__chart-button--active {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-bg);
}

.tracker__chart-body {
  height: 200px;
  position: relative;
  width: 100%;
}

.tracker__chart-line {
  align-items: flex-end;
  display: flex;
  height: 80%;
  justify-content: space-between;
  position: relative;
  width: 100%;
}

.tracker__chart-line::before {
  background-color: var(--color-accent);
  content: '';
  height: 2px;
  left: 0;
  position: absolute;
  top: 100%;
  width: 100%;
  z-index: 1;
}

.tracker__chart-point {
  background-color: var(--color-accent);
  border-radius: 50%;
  height: 10px;
  position: relative;
  transform: translateY(50%);
  width: 10px;
}

.tracker__chart-point::before {
  background-color: var(--color-accent);
  content: '';
  height: calc(var(--point-height) + 5px);
  left: 50%;
  position: absolute;
  top: 0;
  transform: translate(-50%, -100%);
  width: 2px;
}

.tracker__chart-point::after {
  background-color: var(--color-bg);
  border: 1px solid var(--color-accent);
  border-radius: var(--border-radius);
  color: var(--color-text);
  content: attr(data-value);
  font-size: var(--font-size-xs);
  left: 50%;
  opacity: 0;
  padding: var(--space-xs) var(--space-sm);
  position: absolute;
  top: 0;
  transform: translate(-50%, -40px);
  transition: opacity var(--transition-fast);
  white-space: nowrap;
  z-index: 2;
}

.tracker__chart-point:hover::after {
  opacity: 1;
}

.tracker__chart-labels {
  display: flex;
  font-size: var(--font-size-xs);
  justify-content: space-between;
  margin-top: var(--space-md);
  width: 100%;
}

/* Testimonials Section */
.testimonials {
  background-color: var(--color-bg);
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

.testimonials__slider {
  display: grid;
  gap: var(--space-lg);
  margin-bottom: var(--space-lg);
  overflow: hidden;
  position: relative;
}

.testimonials__slide {
  transition: transform var(--transition-medium);
  width: 100%;
}

.testimonials__quote {
  background-color: var(--color-secondary);
  border-left: 4px solid var(--color-accent);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-md);
  padding: var(--space-xl);
}

.testimonials__quote p {
  font-size: var(--font-size-md);
  font-style: italic;
  margin-bottom: var(--space-md);
}

.testimonials__quote footer {
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-align: right;
}

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

.testimonials__button {
  align-items: center;
  background-color: var(--color-secondary);
  border-radius: 50%;
  display: flex;
  height: 40px;
  justify-content: center;
  margin: 0 var(--space-md);
  transition: background-color var(--transition-fast);
  width: 40px;
}

.testimonials__button:hover {
  background-color: var(--color-accent);
}

.testimonials__button:hover svg {
  fill: var(--color-bg);
}

.testimonials__button svg {
  fill: var(--color-text);
  height: 24px;
  transition: fill var(--transition-fast);
  width: 24px;
}

.testimonials__indicators {
  display: flex;
}

.testimonials__indicator {
  background-color: var(--color-secondary);
  border-radius: 50%;
  height: 10px;
  margin: 0 var(--space-xs);
  transition: background-color var(--transition-fast);
  width: 10px;
}

.testimonials__indicator--active {
  background-color: var(--color-accent);
}

/* Benefits Section */
.benefits {
  background-color: var(--color-secondary);
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

.benefits__infographic {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: repeat(1, 1fr);
}

.benefits__item {
  background-color: var(--color-bg);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
  text-align: center;
}

.benefits__icon {
  align-items: center;
  background-color: var(--color-accent);
  border-radius: 50%;
  display: flex;
  height: 60px;
  justify-content: center;
  margin-bottom: var(--space-lg);
  margin-left: auto;
  margin-right: auto;
  width: 60px;
}

.benefits__icon .icon {
  fill: var(--color-bg);
  height: 30px;
  width: 30px;
}

/* FAQ Section */
.faq {
  background-color: var(--color-bg);
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

.faq__list {
  margin-left: auto;
  margin-right: auto;
  max-width: 800px;
}

.faq__item {
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-md);
}

.faq__question {
  align-items: center;
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  font-family: var(--font-heading);
  font-size: var(--font-size-md);
  font-weight: 600;
  justify-content: space-between;
  padding: var(--space-md) 0;
  text-align: left;
  width: 100%;
}

.faq__icon {
  fill: var(--color-text);
  height: 24px;
  transition: transform var(--transition-fast);
  width: 24px;
}

.faq__question[aria-expanded="true"] .faq__icon {
  transform: rotate(180deg);
}

.faq__answer {
  padding-bottom: var(--space-md);
}

/* Contact Form Section */
.contact {
  background-color: var(--color-secondary);
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

.contact__content {
  display: flex;
  flex-direction: column;
}

.contact__info {
  margin-bottom: var(--space-xl);
}

.contact__address {
  font-style: normal;
}

.contact__address p {
  align-items: center;
  display: flex;
  margin-bottom: var(--space-md);
}

.contact__address .icon {
  fill: var(--color-accent);
  height: 24px;
  margin-right: var(--space-md);
  width: 24px;
}

.contact__form {
  background-color: var(--color-bg);
  border-radius: var(--border-radius);
  padding: var(--space-xl);
}

.contact__form-group {
  margin-bottom: var(--space-lg);
}

.contact__label {
  display: block;
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.contact__input {
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  display: block;
  padding: var(--space-md);
  transition: border-color var(--transition-fast);
  width: 100%;
}

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

.contact__textarea {
  min-height: 150px;
  resize: vertical;
}

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

.contact__submit {
  background-color: var(--color-button);
  border: none;
  border-radius: var(--border-radius);
  color: var(--color-bg);
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: var(--font-size-md);
  font-weight: 600;
  padding: var(--space-md) var(--space-xl);
  text-transform: uppercase;
  transition: background-color var(--transition-fast);
  width: 100%;
}

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

/* Legal Pages */
.legal-page {
  background-color: var(--color-bg);
  margin-top: 76px;
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

.legal-page__container {
  margin-left: auto;
  margin-right: auto;
  max-width: 800px;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
  width: 100%;
}

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

.legal-page__date {
  color: var(--color-text-light);
  font-size: var(--font-size-sm);
  font-style: italic;
  margin-bottom: var(--space-lg);
}

.legal-page__section {
  margin-bottom: var(--space-xl);
}

.legal-page__section h2 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-md);
}

.legal-page__section h3 {
  font-size: var(--font-size-md);
  margin-bottom: var(--space-sm);
}

.legal-page__section address {
  font-style: normal;
  margin-top: var(--space-md);
}

/* Success Page */
.success-page {
  background-color: var(--color-bg);
  margin-top: 76px;
  padding-bottom: var(--space-3xl);
  padding-top: var(--space-3xl);
}

.success-page__container {
  margin-left: auto;
  margin-right: auto;
  max-width: 800px;
  padding-left: var(--container-padding);
  padding-right: var(--container-padding);
  width: 100%;
}

.success-page__content {
  background-color: var(--color-secondary);
  border-radius: var(--border-radius);
  margin-bottom: var(--space-xl);
  padding: var(--space-xl);
  text-align: center;
}

.success-page__icon {
  align-items: center;
  background-color: var(--color-success);
  border-radius: 50%;
  display: flex;
  height: 60px;
  justify-content: center;
  margin-bottom: var(--space-lg);
  margin-left: auto;
  margin-right: auto;
  width: 60px;
}

.success-page__icon svg {
  fill: var(--color-bg);
  height: 30px;
  width: 30px;
}

.success-page__icon--error {
  background-color: var(--color-error);
}

.success-page__title {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--space-md);
}

.success-page__description {
  font-size: var(--font-size-md);
  margin-bottom: var(--space-xl);
  margin-left: auto;
  margin-right: auto;
  max-width: 600px;
}

.success-page__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  justify-content: center;
}

.success-page__button {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: var(--font-size-sm);
  font-weight: 600;
  padding: var(--space-md) var(--space-xl);
  text-transform: uppercase;
  transition: background-color var(--transition-fast), color var(--transition-fast);
}

.success-page__button--primary {
  background-color: var(--color-button);
  border-radius: var(--border-radius);
  color: var(--color-bg);
}

.success-page__button--primary:hover {
  background-color: var(--color-button-hover);
  color: var(--color-bg);
  text-decoration: none;
}

.success-page__button--secondary {
  background-color: var(--color-bg);
  border: 1px solid var(--color-button);
  border-radius: var(--border-radius);
  color: var(--color-button);
}

.success-page__button--secondary:hover {
  background-color: var(--color-button);
  color: var(--color-bg);
  text-decoration: none;
}

.success-page__extra {
  margin-top: var(--space-xl);
}

.success-page__extra h2 {
  margin-bottom: var(--space-lg);
  text-align: center;
}

.success-page__tips {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: 1fr;
}

.success-page__tip {
  background-color: var(--color-secondary);
  border-radius: var(--border-radius);
  padding: var(--space-lg);
}

.success-page__tip h3 {
  font-size: var(--font-size-md);
  margin-bottom: var(--space-md);
}

@media (min-width: 768px) {
  .success-page__actions {
    flex-direction: row;
    justify-content: center;
  }
  
  .success-page__tips {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Footer */
.footer {
  background-color: var(--color-text);
  color: var(--color-bg);
  padding-bottom: var(--space-xl);
  padding-top: var(--space-3xl);
}

.footer__top {
  display: flex;
  flex-direction: column;
  margin-bottom: var(--space-xl);
}

.footer__logo {
  margin-bottom: var(--space-xl);
  text-align: center;
}

.footer__logo img {
  filter: brightness(10);
  height: 40px;
  margin-bottom: var(--space-sm);
  margin-left: auto;
  margin-right: auto;
}

.footer__slogan {
  font-family: var(--font-heading);
  font-size: var(--font-size-md);
  font-weight: 600;
  margin-bottom: 0;
}

.footer__stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-around;
  margin-bottom: var(--space-xl);
}

.footer__stat {
  margin-bottom: var(--space-lg);
  text-align: center;
}

.footer__stat-number {
  color: var(--color-accent);
  display: block;
  font-family: var(--font-heading);
  font-size: var(--font-size-2xl);
  font-weight: 700;
  line-height: 1.2;
}

.footer__stat-label {
  display: block;
  font-size: var(--font-size-sm);
}

.footer__links {
  display: grid;
  gap: var(--space-xl);
  grid-template-columns: repeat(1, 1fr);
  margin-bottom: var(--space-xl);
}

.footer__heading {
  color: var(--color-accent);
  font-size: var(--font-size-md);
  margin-bottom: var(--space-md);
}

.footer__nav {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer__nav li {
  margin-bottom: var(--space-sm);
}

.footer__nav a {
  color: var(--color-bg);
  transition: color var(--transition-fast);
}

.footer__nav a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.footer__blog-post {
  margin-bottom: var(--space-md);
}

.footer__blog-post h4 {
  color: var(--color-bg);
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-xs);
}

.footer__blog-post time {
  color: var(--color-secondary);
  font-size: var(--font-size-xs);
}

.footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--space-lg);
  text-align: center;
}

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

/* Back to top button */
.back-to-top {
  align-items: center;
  background-color: var(--color-accent);
  border-radius: 50%;
  bottom: var(--space-lg);
  display: flex;
  height: 50px;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  position: fixed;
  right: var(--space-lg);
  transition: opacity var(--transition-fast), background-color var(--transition-fast);
  width: 50px;
  z-index: 10;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.back-to-top:hover {
  background-color: var(--color-button-hover);
  text-decoration: none;
}

.back-to-top svg {
  fill: var(--color-bg);
  height: 24px;
  width: 24px;
}

/* Responsive Styles */
@media (min-width: 576px) {
  .hero__title {
    font-size: var(--font-size-4xl);
  }
  
  .programs__grid,
  .use-cases__grid,
  .benefits__infographic {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 768px) {
  .header__mobile-toggle {
    display: none;
  }
  
  .header__menu {
    display: flex;
  }
  
  .hero__container {
    flex-direction: row;
    align-items: center;
  }
  
  .hero__content {
    flex: 1;
    margin-bottom: 0;
    margin-right: var(--space-xl);
    text-align: left;
  }
  
  .hero__graphic {
    flex: 1;
  }
  
  .heart-health__grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .tracker__content {
    flex-direction: row;
  }
  
  .tracker__info {
    flex: 1;
    margin-bottom: 0;
    margin-right: var(--space-xl);
  }
  
  .tracker__visual {
    flex: 1;
  }
  
  .tracker__chart-header {
    flex-direction: row;
  }
  
  .tracker__chart-controls {
    margin-top: 0;
  }
  
  .contact__content {
    flex-direction: row;
  }
  
  .contact__info {
    flex: 1;
    margin-bottom: 0;
    margin-right: var(--space-xl);
  }
  
  .contact__form {
    flex: 2;
  }
  
  .footer__top {
    flex-direction: row;
    justify-content: space-between;
  }
  
  .footer__logo {
    margin-bottom: 0;
    text-align: left;
  }
  
  .footer__logo img {
    margin-left: 0;
  }
  
  .footer__links {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 992px) {
  .heart-health__grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .programs__grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .use-cases__grid {
    grid-template-columns: repeat(4, 1fr);
  }
  
  .benefits__infographic {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Icon styles */
.icon {
  display: inline-block;
  fill: currentColor;
  height: 24px;
  width: 24px;
}

/* Animations */
@keyframes pulse {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
  100% {
    transform: scale(1);
  }
}

.hero__animation {
  animation: pulse 3s infinite;
}

/* Accessibility - Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  
  .hero__animation,
  .testimonials__slide,
  .faq__icon {
    animation: none;
    transition: none;
  }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #1D3557;
    --color-accent: #E63946;
    --color-secondary: #2C4870;
    --color-text: #F1FAEE;
    --color-text-light: #A8DADC;
    --color-border: #457B9D;
  }
  
  .header {
    background-color: #162841;
  }
  
  .hero {
    background-color: var(--color-secondary);
  }
  
  .programs__card,
  .tracker__visual,
  .contact__form,
  .benefits__item {
    background-color: #162841;
  }
  
  .testimonials__quote {
    background-color: var(--color-secondary);
  }
  
  .footer {
    background-color: #0F1C2D;
  }
}