/* ===================
  CSS Variables
  =================== */
:root {
  /* Colors */
  --color-background: #f6f7fb;
  --color-surface: #fff;
  --color-text: #20232a;
  --color-primary: #4c8afb;
  --color-primary-hover: #2767d7;
  --color-success: #3ca87b;
  --color-warning: #ffd166;
  --color-danger: #ef476f;
  --color-neutral-900: #13151a;
  --color-neutral-700: #31333b;
  --color-neutral-500: #8a8d96;
  --color-neutral-300: #dadbe3;
  --color-neutral-100: #f0f1f5;

  /* Typography */
  --font-sans: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-serif: 'Merriweather', Georgia, 'Times New Roman', serif;
  --base-font-size: 16px;
  --font-size-1: 3rem;
  --font-size-2: 2.25rem;
  --font-size-3: 1.5rem;
  --font-size-4: 1.125rem;
  --font-size-5: 1rem;
  --font-size-6: 0.875rem;
  --line-height-base: 1.6;
  --line-height-heading: 1.2;

  /* Spacing Scale (0 - 96px) */
  --space-0: 0;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --space-9: 48px;
  --space-10: 64px;
  --space-11: 80px;
  --space-12: 96px;

  /* Radius, Shadows, Transitions */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --shadow-xs: 0 1px 2px 0 rgba(60, 72, 93, 0.07);
  --shadow-md: 0 3px 8px 0 rgba(60, 72, 93, 0.10);
  --shadow-lg: 0 8px 24px 0 rgba(60, 72, 93, 0.12);
  --transition-fast: 0.15s cubic-bezier(0.4,0,0.2,1);
  --transition-base: 0.25s cubic-bezier(0.4,0,0.2,1);
  --focus-outline: 2px solid var(--color-primary);
}

/* ===================
  Reset / Normalize
  =================== */
html {
  box-sizing: border-box;
  font-size: 100%;
  scroll-behavior: smooth;
}
*, *::before, *::after {
  box-sizing: inherit;
}
body, h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd {
  margin: 0;
}
ul[role='list'],
ol[role='list'] {
  list-style: none;
  padding: 0;
  margin: 0;
}
img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}
input, button, textarea, select {
  font: inherit;
}
body {
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  background: var(--color-background);
  color: var(--color-text);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
  }
}

/* ===================
  Base Styles
  =================== */
body {
  font-family: var(--font-sans);
  font-size: var(--base-font-size);
  line-height: var(--line-height-base);
  background: var(--color-background);
  color: var(--color-text);
}

h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-heading);
  margin-bottom: var(--space-3);
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--color-neutral-900);
}
h1 {
  font-size: var(--font-size-1);
}
h2 {
  font-size: var(--font-size-2);
}
h3 {
  font-size: var(--font-size-3);
}
h4 {
  font-size: var(--font-size-4);
}
h5 {
  font-size: var(--font-size-5);
}
h6 {
  font-size: var(--font-size-6);
}

p {
  margin-bottom: var(--space-4);
  line-height: var(--line-height-base);
}

a {
  text-decoration: underline;
  color: var(--color-primary);
  transition: color var(--transition-fast);
}
a:hover, a:focus-visible {
  color: var(--color-primary-hover);
  text-decoration-thickness: 2px;
}
a:focus-visible {
  outline: var(--focus-outline);
  outline-offset: 2px;
}

hr {
  border: none;
  border-top: 1px solid var(--color-neutral-300);
  margin: var(--space-6) 0;
}

/* ===================
  Utilities
  =================== */
.container {
  max-width: 1200px;
  margin-right: auto;
  margin-left: auto;
  padding-left: var(--space-5);
  padding-right: var(--space-5);
  width: 100%;
}

.flex {
  display: flex;
}
.flex-center {
  justify-content: center;
  align-items: center;
}
.flex-column {
  flex-direction: column;
}
.grid {
  display: grid;
  gap: var(--space-5);
}

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

/* ===================
  Components
  =================== */
/* Button */
.button, button, input[type='submit'], input[type='button'] {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.4;
  padding: var(--space-3) var(--space-6);
  color: #fff;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xs);
  cursor: pointer;
  transition: background var(--transition-base), box-shadow var(--transition-fast), color var(--transition-fast);
}
.button:hover, button:hover,
.button:focus-visible, button:focus-visible {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
  outline: var(--focus-outline);
}
.button:disabled, button:disabled,
input[disabled], input[type='submit'][disabled] {
  opacity: 0.5;
  cursor: not-allowed;
  background: var(--color-neutral-300);
  color: var(--color-neutral-700);
}

/* Inputs */
input, textarea, select {
  display: block;
  width: 100%;
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-neutral-300);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  margin-bottom: var(--space-4);
}
input:focus, textarea:focus, select:focus {
  border-color: var(--color-primary);
  outline: var(--focus-outline);
  box-shadow: var(--shadow-xs);
}
input[disabled], textarea[disabled], select[disabled] {
  background: var(--color-neutral-100);
  color: var(--color-neutral-500);
  cursor: not-allowed;
}

/* Card */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-7);
  margin-bottom: var(--space-7);
}

/* Accessibility: Custom Focus Outline */
:focus:not(:focus-visible) {
  outline: none;
}

/* Responsive Headings */
@media (max-width: 650px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.1875rem; }
  .container { padding-left: var(--space-4); padding-right: var(--space-4); }
  .card { padding: var(--space-5); }
}

/* ===================
  Header & Footer styles (shared across all pages)
  =================== */
.main-header {
  background: var(--color-surface);
  box-shadow: var(--shadow-xs);
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--space-2) 0;
}
.header-inner {
  justify-content: space-between;
  align-items: center;
  min-height: 56px;
}
.site-title {
  font-size: 1.55rem;
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -1px;
}
.site-title:focus-visible {
  outline: var(--focus-outline);
}
.site-nav {
  position: relative;
}
.nav-toggle {
  background: none;
  border: none;
  display: none;
  cursor: pointer;
  padding: var(--space-2);
  margin-left: var(--space-2);
}
.nav-toggle-icon {
  width: 28px;
  height: 3px;
  display: block;
  background: var(--color-primary);
  position: relative;
}
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  display: block;
  position: absolute;
  width: 28px;
  height: 3px;
  background: var(--color-primary);
  left: 0;
}
.nav-toggle-icon::before { top: -9px; }
.nav-toggle-icon::after { top: 9px; }
.nav-list {
  display: flex;
  gap: var(--space-5);
}
.nav-list li a {
  font-weight: 600;
  font-size: var(--font-size-5);
  color: var(--color-text);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.nav-list li a:hover,
.nav-list li a:focus-visible {
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
  outline: var(--focus-outline);
}

@media (max-width: 900px) {
  .nav-list {
    gap: var(--space-3);
  }
}
@media (max-width: 700px) {
  .main-header {
    padding: var(--space-1) 0;
  }
  .nav-toggle {
    display: block;
  }
  .nav-list {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--color-surface);
    box-shadow: var(--shadow-lg);
    flex-direction: column;
    min-width: 170px;
    padding: var(--space-3) 0;
    z-index: 20;
  }
  .nav-list.open {
    display: flex;
  }
  .nav-list li a {
    font-size: 1rem;
    padding: var(--space-3) var(--space-5);
    width: 100%;
  }
  .header-inner {
    min-height: 48px;
  }
}

/* Footer */
.site-footer {
  background: var(--color-neutral-100);
  color: var(--color-neutral-700);
  margin-top: var(--space-8);
  padding: var(--space-8) 0 var(--space-5) 0;
  font-size: var(--font-size-6);
  box-shadow: var(--shadow-xs) inset 0 1px 0 0;
  position: relative;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-9);
  flex-wrap: wrap;
}
.footer-about {
  max-width: 220px;
}
.footer-site-title {
  font-size: var(--font-size-3);
  color: var(--color-primary);
  font-weight: 700;
  margin-bottom: var(--space-1);
  display: inline-block;
}
.footer-description {
  margin-bottom: 0;
}
.footer-nav ul,
.footer-legal ul {
  list-style: none;
  padding: 0;
}
.footer-nav ul li,
.footer-legal ul li {
  margin-bottom: var(--space-2);
}
.footer-nav a, .footer-legal a {
  color: var(--color-neutral-700);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.footer-nav a:hover, .footer-legal a:hover,
.footer-nav a:focus-visible, .footer-legal a:focus-visible {
  color: var(--color-primary);
  text-decoration: underline;
  outline: var(--focus-outline);
}
.footer-bottom {
  text-align: center;
  margin-top: var(--space-5);
  color: var(--color-neutral-500);
}
@media (max-width: 700px) {
  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-7);
  }
}

/* Cookie Consent Banner */
.cookie-consent {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(255,255,255,0.98);
  box-shadow: 0 -1px 10px rgba(44,45,66,0.05);
  padding: var(--space-5) var(--space-4);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  z-index: 2500;
  gap: var(--space-5);
  font-size: var(--font-size-5);
  transition: transform .3s ease, opacity .3s ease;
}
.cookie-consent[hidden],
.cookie-consent.inactive {
  display: none;
  pointer-events: none;
}
.cookie-message {
  max-width: 420px;
  margin-right: var(--space-5);
  color: var(--color-neutral-700);
}
.cookie-actions {
  display: flex;
  gap: var(--space-3);
}
.button.button-outline {
  background: #fff;
  color: var(--color-primary);
  border: 1.5px solid var(--color-primary);
}
.button.button-outline:hover,
.button.button-outline:focus-visible {
  background: var(--color-primary-hover);
  color: #fff;
}
@media (max-width: 700px) {
  .cookie-consent {
    flex-direction: column;
    gap: var(--space-4);
    font-size: var(--font-size-6);
    padding: var(--space-4) var(--space-3);
    text-align: center;
  }
  .cookie-message {
    margin-right: 0;
  }
}