/* ===========================================================================
   VARIABLES
   =========================================================================== */
:root {
  /* Colors */
  --color-background: #f6f8fb;
  --color-surface: #fff;
  --color-text: #23272f;
  --color-primary: #2055ee;
  --color-primary-hover: #173caa;
  --color-success: #19b378;
  --color-warning: #fbbc05;
  --color-danger: #df352e;
  /* Neutral grays */
  --color-gray-100: #f0f2f4;
  --color-gray-200: #e1e3e8;
  --color-gray-300: #c6c9d0;
  --color-gray-400: #9ea3ad;
  --color-gray-500: #6c7380;
  --color-gray-600: #474d59;
  --color-gray-700: #23272f;

  /* Typography */
  --font-family-sans: 'Inter', 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'Fira Mono', 'Menlo', 'Monaco', monospace;
  --font-size-xs: 0.75rem;   /* 12px */
  --font-size-sm: 0.875rem;  /* 14px */
  --font-size-md: 1rem;      /* 16px */
  --font-size-lg: 1.25rem;   /* 20px */
  --font-size-xl: 1.5rem;    /* 24px */
  --font-size-2xl: 2rem;     /* 32px */
  --line-height-base: 1.6;
  --line-height-heading: 1.25;

  /* Spacing scale */
  --space-0: 0;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;
  --space-24: 96px;

  /* Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;

  /* Shadows */
  --shadow-xs: 0 1px 3px rgba(23,34,68,0.04);
  --shadow-sm: 0 2px 8px rgba(23,34,68,0.08);
  --shadow-md: 0 6px 24px rgba(23,34,68,0.10);

  /* Transition durations */
  --transition-fast: 120ms;
  --transition-base: 200ms;
  --transition-slow: 350ms;
}

/* ===========================================================================
   RESET / NORMALIZE
   =========================================================================== */
* {
  box-sizing: border-box;
}

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

body, h1, h2, h3, h4, h5, h6, p, ul, ol, figure, blockquote, dl, dd {
  margin: 0;
  padding: 0;
}

ul, ol {
  list-style: none;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  outline: none;
}

button {
  cursor: pointer;
}

a {
  text-decoration: none;
  color: inherit;
}

/* Remove built-in form appearance */
input, button, textarea, select {
  appearance: none;
  -webkit-appearance: none;
}

/* ===========================================================================
   BASE STYLES
   =========================================================================== */
body {
  font-family: var(--font-family-sans);
  font-size: var(--font-size-md);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background: var(--color-background);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

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

h1 {
  font-size: var(--font-size-2xl);
  margin-top: var(--space-12);
}
h2 {
  font-size: var(--font-size-xl);
  margin-top: var(--space-8);
}
h3 {
  font-size: var(--font-size-lg);
  margin-top: var(--space-6);
}
h4 {
  font-size: var(--font-size-md);
  margin-top: var(--space-6);
}
h5 {
  font-size: var(--font-size-sm);
  margin-top: var(--space-4);
}
h6 {
  font-size: var(--font-size-xs);
  margin-top: var(--space-4);
}

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

a {
  color: var(--color-primary);
  transition: color var(--transition-base);
}

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

a:active {
  color: var(--color-primary-hover);
}

/* Accessibility: better outline only on keyboard navigation */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius-md);
}
:focus:not(:focus-visible) {
  outline: none;
}

/* ===========================================================================
   UTILITIES
   =========================================================================== */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

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

.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, [type="button"], [type="submit"] {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--font-size-md);
  font-family: var(--font-family-sans);
  font-weight: 600;
  line-height: 1.4;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: #fff;
  border: none;
  box-shadow: var(--shadow-xs);
  transition: background var(--transition-base), box-shadow var(--transition-fast);
  text-align: center;
}
.button:hover, .button:focus-visible, button:hover, button:focus-visible {
  background: var(--color-primary-hover);
  box-shadow: var(--shadow-sm);
}
.button:disabled, button:disabled, [type="button"][disabled], [type="submit"][disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  background: var(--color-gray-300);
  color: var(--color-gray-500);
}
.button--secondary {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 1px solid var(--color-gray-200);
}
.button--secondary:hover, .button--secondary:focus-visible {
  background: var(--color-gray-100);
}

input, select, textarea {
  width: 100%;
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-md);
  font-family: var(--font-family-sans);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-gray-200);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-base);
  box-shadow: var(--shadow-xs);
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(32,85,238,0.10);
}
input:disabled, select:disabled, textarea:disabled {
  background: var(--color-gray-100);
  color: var(--color-gray-400);
  cursor: not-allowed;
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-6);
  margin-bottom: var(--space-6);
  transition: box-shadow var(--transition-base);
}
.card:hover, .card:focus-within {
  box-shadow: 0 10px 32px 0 rgba(35, 39, 47, 0.13);
}

/* Success, warning, danger alert helpers */
.alert-success {
  background: #e6f7f2;
  color: var(--color-success);
}
.alert-warning {
  background: #fffbe5;
  color: var(--color-warning);
}
.alert-danger {
  background: #fff3f3;
  color: var(--color-danger);
}

/* ===========================================================================
   HEADER & FOOTER STYLES
   =========================================================================== */

/* Header */
.main-header {
  background: var(--color-surface);
  box-shadow: var(--shadow-xs);
  position: sticky;
  top: 0;
  z-index: 50;
}
.site-logo {
  font-weight: 700;
  letter-spacing: 1px;
  font-size: 1.25rem;
  color: var(--color-primary);
  padding-block: var(--space-4);
  display: inline-block;
}
.main-nav {
  display: block;
}
.nav-list {
  display: flex;
  gap: var(--space-6);
}
.nav-list li a {
  font-weight: 500;
  font-size: var(--font-size-md);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: background var(--transition-fast);
}
.nav-list li a:focus-visible, .nav-list li a:hover {
  background: var(--color-gray-100);
}
.mobile-nav-toggle {
  background: none;
  border: none;
  display: none;
  padding: var(--space-2);
  margin-left: var(--space-2);
}

/* Responsive Nav */
@media (max-width: 950px) {
  .nav-list {
    gap: var(--space-3);
  }
}
@media (max-width: 770px) {
  .main-nav {
    position: fixed;
    inset: 0 0 0 auto;
    background: var(--color-surface);
    width: 65vw;
    max-width: 320px;
    height: 100dvh;
    transform: translateX(100%);
    box-shadow: -2px 0 12px #0001;
    transition: transform var(--transition-fast) cubic-bezier(.5,.2,.2,1);
    z-index: 60;
    display: block;
  }
  .main-nav.open {
    transform: none;
  }
  .nav-list {
    display: flex;
    flex-direction: column;
    padding: var(--space-6);
    gap: var(--space-4);
  }
  .mobile-nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }
}

/* Footer */
.site-footer {
  background: var(--color-surface);
  box-shadow: var(--shadow-xs);
  padding-top: var(--space-8);
  padding-bottom: var(--space-12);
  position: relative;
}
.footer-content {
  flex-wrap: wrap;
  gap: var(--space-6);
  align-items: flex-start;
  margin-bottom: var(--space-4);
}
.footer-site-name {
  font-weight: 700;
  color: var(--color-primary);
  font-size: var(--font-size-lg);
}
.footer-nav-list, .footer-legal-list {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}
.copyright {
  text-align: center;
  color: var(--color-gray-400);
  font-size: var(--font-size-xs);
  padding-top: var(--space-2);
}

@media (max-width: 600px) {
  .footer-content {
    flex-direction: column;
    gap: var(--space-2);
    align-items: stretch;
  }
}

/* ===========================================================================
   COOKIE CONSENT BANNER
   =========================================================================== */
.cookie-consent-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100vw;
  background: var(--color-surface);
  border-top: 1px solid var(--color-gray-200);
  box-shadow: 0 -4px 16px #23272f14;
  z-index: 9999;
  padding-block: var(--space-4);
}
.cookie-container {
  display: flex;
  gap: var(--space-4);
  align-items: center;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}
.cookie-text {
  flex: 1 1 auto;
  color: var(--color-gray-700);
  font-size: var(--font-size-sm);
}
.cookie-actions {
  display: flex;
  gap: var(--space-2);
}
@media (max-width: 650px) {
  .cookie-container {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
}

/* ===========================================================================
   RESPONSIVE & REDUCED MOTION
   =========================================================================== */
@media (max-width: 600px) {
  .container {
    padding-inline: var(--space-2);
  }
  .card {
    padding: var(--space-4);
  }
  h1 {
    font-size: 1.5rem;
  }
  h2 {
    font-size: 1.25rem;
  }
}

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