:root {
  --color-primary: #1A5CFF;
  --color-primary-dark: #0F3FCC;
  --color-accent-lime: #B6FF3C;
  --color-accent-orange: #FF6B2C;
  --color-surface: #FFFFFF;
  --color-surface-alt: #F5F7FA;
  --color-text-primary: #1E1E1E;
  --color-text-secondary: #5A5A5A;
  --color-border: #D9DEE5;

  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Inter', sans-serif;

  --text-h1: clamp(2rem, 1rem + 3.2vw, 3rem);
  --text-h2: clamp(1.75rem, 1.2rem + 2.2vw, 2.25rem);
  --text-h3: clamp(1.5rem, 1.1rem + 1.6vw, 1.75rem);
  --text-h4: 1.25rem;
  --text-body: 1rem;
  --text-small: 0.875rem;

  --leading-h1: 1.1;
  --leading-h2: 1.2;
  --leading-h3: 1.3;
  --leading-h4: 1.4;
  --leading-body: 1.6;
  --leading-small: 1.5;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 24px;
  --space-6: 32px;
  --space-7: 48px;
  --space-8: 64px;
  --space-9: 96px;

  --container-max: 1200px;
  --container-padding: 24px;
  --container-padding-desktop: 32px;
  --grid-gap: 24px;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --border-width: 2px;
  --shadow-raised: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-hover: 0 2px 8px rgba(0, 0, 0, 0.1);
}

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-body);
  font-weight: 400;
  line-height: var(--leading-body);
  color: var(--color-text-primary);
  background-color: var(--color-surface);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  color: var(--color-text-primary);
  line-height: var(--leading-h1);
  font-weight: 700;
  margin-block-end: var(--space-4);
}

h1 {
  font-size: var(--text-h1);
  line-height: var(--leading-h1);
  font-weight: 700;
}

h2 {
  font-size: var(--text-h2);
  line-height: var(--leading-h2);
  font-weight: 700;
}

h3 {
  font-size: var(--text-h3);
  line-height: var(--leading-h3);
  font-weight: 600;
}

h4 {
  font-size: var(--text-h4);
  line-height: var(--leading-h4);
  font-weight: 600;
}

h5 {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  font-weight: 600;
}

h6 {
  font-size: var(--text-small);
  line-height: var(--leading-small);
  font-weight: 600;
}

p {
  font-size: var(--text-body);
  line-height: var(--leading-body);
  margin-block-end: var(--space-4);
}

p:last-child {
  margin-block-end: 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--color-primary-dark);
  text-decoration: underline;
}

ul,
ol {
  margin-block-end: var(--space-4);
  padding-inline-start: var(--space-5);
}

ul:last-child,
ol:last-child {
  margin-block-end: 0;
}

li {
  line-height: var(--leading-body);
}

blockquote {
  margin-block-end: var(--space-4);
  padding-inline-start: var(--space-4);
  border-inline-start: 4px solid var(--color-primary);
  color: var(--color-text-secondary);
}

blockquote:last-child {
  margin-block-end: 0;
}

figure {
  margin-block-end: var(--space-4);
}

figure:last-child {
  margin-block-end: 0;
}

figcaption {
  font-size: var(--text-small);
  line-height: var(--leading-small);
  color: var(--color-text-secondary);
  margin-block-start: var(--space-2);
}

small {
  font-size: var(--text-small);
  line-height: var(--leading-small);
}

strong {
  font-weight: 700;
}

em {
  font-style: italic;
}

hr {
  border: none;
  border-block-start: 1px solid var(--color-border);
  margin-block: var(--space-6);
}

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  max-width: 100%;
  height: auto;
}

img,
svg,
video,
canvas {
  vertical-align: middle;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  color: inherit;
  border-radius: var(--radius-sm);
}

button {
  cursor: pointer;
  background: none;
  border: none;
  padding: 0;
}

input,
select,
textarea {
  background-color: var(--color-surface-alt);
  border: 2px solid var(--color-border);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  transition: border-color 0.2s ease;
}

input:focus,
select:focus,
textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}

textarea {
  resize: vertical;
  min-height: 100px;
}

::placeholder {
  color: var(--color-text-secondary);
  opacity: 1;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--container-padding);
}

.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;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-4);
  z-index: 1000;
  background-color: var(--color-primary);
  color: var(--color-surface);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-sm);
  font-weight: 600;
  transition: top 0.2s ease;
}

.skip-link:focus {
  top: var(--space-4);
  color: var(--color-surface);
  text-decoration: none;
}

.card {
  background-color: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
}

.card > :last-child {
  margin-block-end: 0;
}

.panel {
  background-color: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}

.panel > :last-child {
  margin-block-end: 0;
}

.btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--text-body);
  line-height: 1.2;
  text-align: center;
  text-decoration: none;
  padding: var(--space-3) var(--space-5);
  border-radius: var(--radius-sm);
  border: var(--border-width) solid transparent;
  transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}

.btn:hover {
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-accent-orange);
  color: var(--color-surface);
  border-color: var(--color-accent-orange);
}

.btn-primary:hover {
  background-color: #E55A1F;
  border-color: #E55A1F;
  color: var(--color-surface);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

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

.btn-secondary:hover {
  background-color: var(--color-primary);
  color: var(--color-surface);
  border-color: var(--color-primary);
  transform: translateY(-2px);
  box-shadow: var(--shadow-hover);
}

.tag {
  display: inline-block;
  font-size: var(--text-small);
  line-height: var(--leading-small);
  font-weight: 600;
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
  background-color: var(--color-accent-lime);
  color: var(--color-text-primary);
}

.tag-alt {
  background-color: var(--color-surface-alt);
  color: var(--color-text-primary);
}

.flex {
  display: flex;
  gap: var(--space-4);
}

.flex > * {
  min-width: 0;
}

.flex-wrap {
  flex-wrap: wrap;
}

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

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

.flex-between {
  align-items: center;
  justify-content: space-between;
}

.flex-start {
  align-items: flex-start;
  justify-content: flex-start;
}

.flex-end {
  align-items: flex-end;
  justify-content: flex-end;
}

.flex-1 {
  flex: 1 1 0%;
}

.flex-auto {
  flex: 1 1 auto;
}

.flex-none {
  flex: 0 0 auto;
}

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

.grid > * {
  min-width: 0;
}

.grid-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.grid-auto {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.section {
  padding-block: var(--space-8);
}

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

.section-accent {
  background-color: var(--color-accent-lime);
}

@media (min-width: 768px) {
  :root {
    --container-padding: var(--container-padding-desktop);
  }

  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .grid-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 767px) {
  .grid-2,
  .grid-3,
  .grid-4 {
    grid-template-columns: 1fr;
  }

  .btn {
    display: block;
    width: 100%;
  }

  .flex {
    flex-wrap: wrap;
  }
}

@media (min-width: 768px) and (max-width: 1023px) {
  .grid-3,
  .grid-4 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}