@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&display=swap');

:root {
  /* Colors */
  --color-bg: #f5f5f5;
  --color-surface: #ffffff;
  --color-text: #1a1a1a;
  --color-text-muted: #555555;
  --color-primary: #4285F4;
  --color-primary-hover: #357ae8;

  /* Event type colors */
  --color-fair: #75deac;
  --color-fest: #fff16a;
  --color-forum: #aae3ff;
  --color-workshops: #d4a5ff;
  --color-site-visits: #ffb380;

  /* Typography — all clamp-based */
  --font-family: "Poppins", sans-serif;
  --fs-day-title: clamp(1.5rem, 3vw + 0.5rem, 2.5rem);
  --fs-day-subtitle: clamp(0.875rem, 1.5vw + 0.25rem, 1.25rem);
  --fs-card-time: clamp(0.7rem, 1vw + 0.2rem, 0.85rem);
  --fs-card-title: clamp(0.8rem, 1.2vw + 0.2rem, 1rem);
  --fs-card-description: clamp(0.7rem, 1vw + 0.15rem, 0.85rem);
  --fs-card-speakers: clamp(0.65rem, 0.9vw + 0.15rem, 0.8rem);
  --fs-card-type: clamp(0.6rem, 0.8vw + 0.15rem, 0.75rem);
  --fs-nav-btn: clamp(0.75rem, 1vw + 0.2rem, 0.9rem);

  /* Spacing */
  --space-xs: clamp(0.25rem, 0.5vw, 0.5rem);
  --space-sm: clamp(0.5rem, 1vw, 1rem);
  --space-md: clamp(1rem, 2vw, 1.5rem);
  --space-lg: clamp(1.5rem, 3vw, 2.5rem);
  --space-xl: clamp(2rem, 4vw, 3.5rem);

  /* Card */
  --card-width: clamp(240px, 28vw, 300px);
  --card-min-height: clamp(220px, 30vw, 300px);
  --card-radius: 10px;
  --card-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
  --card-shadow-hover: 0 8px 24px rgba(0, 0, 0, 0.14);
  --card-border-width: 4px;

  /* Transitions */
  --transition-fast: 0.2s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* ---- Sticky bar ---- */
.sticky-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  padding: var(--space-sm) var(--space-sm) var(--space-sm);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

/* ---- Day navigation ---- */
.day-nav {
  display: flex;
  gap: var(--space-sm);
  justify-content: center;
  flex-wrap: wrap;
}

.day-nav a {
  text-decoration: none;
  color: var(--color-text);
  font-size: var(--fs-nav-btn);
  font-weight: 500;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 6px;
  background: var(--color-surface);
  box-shadow: var(--card-shadow);
  transition: background var(--transition-fast), transform var(--transition-fast);
  white-space: nowrap;
}

.day-nav a:hover {
  background: var(--color-primary);
  color: var(--color-surface);
  transform: translateY(-1px);
}

/* ---- Day section ---- */
.day-section {
  max-width: 1200px;
  margin: 0 auto;
  padding: var(--space-xl) var(--space-md) var(--space-lg);
}

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

.day-title {
  font-size: var(--fs-day-title);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
}

.day-subtitle {
  font-size: var(--fs-day-subtitle);
  font-weight: 300;
  color: var(--color-text-muted);
  margin-top: var(--space-xs);
  font-style: italic;
}

/* ---- Card grid ---- */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(var(--card-width), 1fr));
  gap: var(--space-md);
}

/* ---- Event card ---- */
.event-card {
  background: var(--color-surface);
  border-radius: var(--card-radius);
  box-shadow: var(--card-shadow);
  display: flex;
  flex-direction: column;
  min-height: var(--card-min-height);
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
  border-bottom: var(--card-border-width) solid transparent;
}

.event-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--card-shadow-hover);
}

/* Type-specific border colors */
.event-card[data-type="fair"]        { border-bottom-color: var(--color-fair); }
.event-card[data-type="fest"]        { border-bottom-color: var(--color-fest); }
.event-card[data-type="forum"]       { border-bottom-color: var(--color-forum); }
.event-card[data-type="workshops"]   { border-bottom-color: var(--color-workshops); }
.event-card[data-type="site-visits"] { border-bottom-color: var(--color-site-visits); }

/* ---- Card time header ---- */
.card-time {
  font-size: var(--fs-card-time);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--card-radius) var(--card-radius) 0 0;
}

.card-time[data-type="fair"]        { background: var(--color-fair); }
.card-time[data-type="fest"]        { background: var(--color-fest); }
.card-time[data-type="forum"]       { background: var(--color-forum); }
.card-time[data-type="workshops"]   { background: var(--color-workshops); }
.card-time[data-type="site-visits"] { background: var(--color-site-visits); }

/* ---- Card body ---- */
.card-body {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: var(--space-sm);
  gap: var(--space-xs);
}

.card-title {
  font-size: var(--fs-card-title);
  font-weight: 600;
  line-height: 1.4;
}

.card-description {
  font-size: var(--fs-card-description);
  color: var(--color-text-muted);
  line-height: 1.4;
}

.card-link {
  color: var(--color-primary);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 500;
  transition: color var(--transition-fast);
}

.card-link:hover {
  color: var(--color-primary-hover);
}

.card-speakers {
  font-size: var(--fs-card-speakers);
  color: var(--color-text);
  margin-top: auto;
  padding-top: var(--space-xs);
  border-top: 1px solid rgba(0, 0, 0, 0.08);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.card-speakers-label {
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.85em;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

.card-speakers-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
}

.card-speaker {
  display: inline-flex;
  align-items: center;
  gap: 0.3em;
  font-weight: 500;
  background: rgba(0, 0, 0, 0.04);
  padding: 0.15em 0.5em;
  border-radius: 4px;
  line-height: 1.4;
}

.speaker-icon {
  width: 1.1em;
  height: 1.1em;
  flex-shrink: 0;
  color: var(--color-text-muted);
}

/* ---- Card type badge ---- */
.card-type {
  font-size: var(--fs-card-type);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: var(--space-xs) var(--space-sm);
  border-radius: 4px;
  align-self: flex-start;
  margin-top: auto;
}

.card-type[data-type="fair"]        { background: var(--color-fair); }
.card-type[data-type="fest"]        { background: var(--color-fest); }
.card-type[data-type="forum"]       { background: var(--color-forum); }
.card-type[data-type="workshops"]   { background: var(--color-workshops); }
.card-type[data-type="site-visits"] { background: var(--color-site-visits); }

/* ---- Filter bar ---- */
.filter-bar {
  display: flex;
  gap: var(--space-xs);
  justify-content: center;
  flex-wrap: wrap;
}

.filter-btn {
  font-family: var(--font-family);
  font-size: var(--fs-nav-btn);
  font-weight: 500;
  padding: var(--space-xs) var(--space-sm);
  border: 2px solid transparent;
  border-radius: 6px;
  cursor: pointer;
  transition: opacity var(--transition-fast), transform var(--transition-fast), border-color var(--transition-fast);
  opacity: 0.55;
}

.filter-btn.active {
  opacity: 1;
  border-color: var(--color-text);
}

.filter-btn[data-filter="all"]         { background: var(--color-surface); }
.filter-btn[data-filter="fair"]        { background: var(--color-fair); }
.filter-btn[data-filter="fest"]        { background: var(--color-fest); }
.filter-btn[data-filter="forum"]       { background: var(--color-forum); }
.filter-btn[data-filter="workshops"]   { background: var(--color-workshops); }
.filter-btn[data-filter="site-visits"] { background: var(--color-site-visits); }

.filter-btn:hover {
  opacity: 1;
  transform: translateY(-1px);
}

/* Hidden card when filtered out */
.event-card.hidden {
  display: none;
}

/* ---- Responsive ---- */
@media (max-width: 600px) {
  .cards-grid {
    grid-template-columns: 1fr;
  }

  .day-nav {
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-xs);
  }
}