/* ============================================================
   style.css — Base styles, CSS variables, header, footer, utilities
   ============================================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Brand colors */
  --color-navy: #000680;
  --color-cyan: #0088ff;
  --color-light: #e5f8fe;
  --color-white: #ffffff;
  --color-gray: #666666;
  --color-border: #e0e0e0;

  /* Impact colors */
  --color-critical: #dc2626;
  --color-high: #ea580c;
  --color-medium: #ca8a04;
  --color-low: #16a34a;

  /* Category badge backgrounds */
  --cat-conference: #dbeafe;
  --cat-sports: #dcfce7;
  --cat-festival: #fef3c7;
  --cat-cultural: #f3e8ff;
  --cat-religious: #fce7f3;
  --cat-holiday: #ffedd5;
  --cat-concert: #e0e7ff;

  /* Typography */
  --font-family: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* Layout */
  --max-width: 1280px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 350ms ease;

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-full: 9999px;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-navy);
  background-color: var(--color-white);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

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

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

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

[hidden] {
  display: none !important;
}

/* --- Header --- */
.site-header {
  background-color: #2A8CC3;
  color: var(--color-white);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.header-logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  text-decoration: none;
}

.header-logo:hover,
.header-logo:focus-visible {
  text-decoration: none;
  opacity: 0.85;
}

.header-logo__icon {
  width: 42px;
  height: 42px;
}

.header-tagline {
  font-family: 'Open Sans', sans-serif;
  font-weight: 300;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
  color: var(--color-white);
  white-space: nowrap;
}

.header-nav {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  flex-direction: column;
  align-items: center;
  background-color: #2A8CC3;
  padding: var(--space-md) 0 var(--space-lg);
  gap: 0;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

.header-nav.is-open {
  display: flex;
}

.nav-link {
  color: var(--color-white);
  font-family: 'Open Sans', sans-serif;
  font-weight: 600;
  font-size: 1.125rem;
  padding: 8px 24px;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}

.nav-link:hover,
.nav-link:focus-visible {
  background-color: rgba(255, 255, 255, 0.15);
  color: var(--color-white);
  text-decoration: none;
}

.nav-link--active {
  font-weight: 600;
  background-color: rgba(255, 255, 255, 0.15);
}

/* Hamburger button */
.header-hamburger {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  flex-shrink: 0;
}

.hamburger-circle {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 5px;
  width: 38px;
  height: 38px;
  background-color: #142451;
  border-radius: 50%;
}

.hamburger-line {
  display: block;
  width: 16px;
  height: 2px;
  background-color: var(--color-white);
  border-radius: 1px;
  transition: transform var(--transition-normal), opacity var(--transition-normal);
}

/* Hamburger → X when open */
.header-hamburger[aria-expanded="true"] .hamburger-line:first-child {
  transform: translateY(3.5px) rotate(45deg);
}

.header-hamburger[aria-expanded="true"] .hamburger-line:last-child {
  transform: translateY(-3.5px) rotate(-45deg);
}

/* --- Main Content --- */
.main-content {
  flex: 1;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg);
  width: 100%;
}

/* --- Error Message --- */
.error-message {
  background-color: #fef2f2;
  border: 1px solid var(--color-critical);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-lg);
  margin-bottom: var(--space-lg);
  color: var(--color-critical);
  font-weight: 500;
}

/* --- Footer --- */
.site-footer {
  background-color: var(--color-light);
  border-top: 1px solid var(--color-border);
  padding: var(--space-lg) 0;
  margin-top: auto;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
  text-align: center;
}

.footer-text {
  color: var(--color-gray);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* --- About Section --- */
.about-section {
  position: fixed;
  inset: 0;
  z-index: 200;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
}

.about-section[hidden] {
  display: none !important;
}

.about-inner {
  background: var(--color-white);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  max-width: 500px;
  width: 100%;
  position: relative;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
}

.about-inner h2 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-md);
  color: var(--color-navy);
}

.about-inner p {
  color: var(--color-gray);
  line-height: 1.7;
}

.about-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  font-size: 1.5rem;
  color: var(--color-gray);
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  transition: background-color var(--transition-fast);
}

.about-close:hover {
  background-color: var(--color-light);
  color: var(--color-navy);
}

/* --- Impact Badge Utility --- */
.impact-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  text-transform: capitalize;
  white-space: nowrap;
}

.impact-badge.critical {
  background-color: #fef2f2;
  color: var(--color-critical);
  border: 1px solid var(--color-critical);
}

.impact-badge.high {
  background-color: #fff7ed;
  color: var(--color-high);
  border: 1px solid var(--color-high);
}

.impact-badge.medium {
  background-color: #fefce8;
  color: var(--color-medium);
  border: 1px solid var(--color-medium);
}

.impact-badge.low {
  background-color: #f0fdf4;
  color: var(--color-low);
  border: 1px solid var(--color-low);
}

/* --- Category Badge Utility --- */
.category-badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 500;
  padding: 2px 10px;
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.category-badge.conference {
  background-color: var(--cat-conference);
  color: #1e40af;
}

.category-badge.sports {
  background-color: var(--cat-sports);
  color: #166534;
}

.category-badge.festival {
  background-color: var(--cat-festival);
  color: #92400e;
}

.category-badge.cultural {
  background-color: var(--cat-cultural);
  color: #6b21a8;
}

.category-badge.religious {
  background-color: var(--cat-religious);
  color: #9d174d;
}

.category-badge.holiday {
  background-color: var(--cat-holiday);
  color: #9a3412;
}

.category-badge.concert {
  background-color: var(--cat-concert);
  color: #3730a3;
}

/* --- Responsive --- */

/* Tablet */
@media (max-width: 1024px) {
  .main-content {
    padding: var(--space-md);
  }

  .header-inner {
    padding: 12px var(--space-md);
  }

  .header-tagline {
    display: none;
  }
}

/* Mobile */
@media (max-width: 768px) {
  .header-tagline {
    display: none;
  }

  .header-logo__icon {
    width: 36px;
    height: 36px;
  }

  .main-content {
    padding: var(--space-sm) var(--space-md);
  }

  .footer-inner {
    padding: 0 var(--space-md);
  }
}