body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  margin: 0;
  padding: 20px;
  background-color: #f5f5f5;
}

#calendar-container {
  max-width: 1200px;
  margin: 0 auto;
  background-color: #fff;
  padding: 20px;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

#calendar-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
}

h1 {
  margin: 0;
  font-size: 24px;
}

#year-select {
  padding: 8px 12px;
  border-radius: 4px;
  border: 1px solid #ccc;
}

#calendar {
  width: 100%;
}

#instructions {
  max-width: 1200px;
  margin: 20px auto;
  padding: 20px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h2 {
  margin-top: 0;
}

ul {
  padding-left: 20px;
}

li {
  margin-bottom: 10px;
}

:root {
    --bg-color: #f4f4f4;
    --text-color: #000000;
    --container-bg: #fff;
    --header-color: #000000;
    --selected-bg: #FFB300;
    --selected-text: #000000;
    --month-header-border: #FFB300;
    --event-hover-bg: #f0f0f0;
    --filter-btn-bg: #fff;
    --filter-btn-text: #333;
    --filter-btn-border: #ccc;
    --footer-border-color: #ccc;
}

body.dark-mode {
    --bg-color: #121212;
    --text-color: #ffffff;
    --container-bg: #1e1e1e;
    --header-color: #ffffff;
    --selected-bg: #FFB300;
    --selected-text: #000000;
    --month-header-border: #FFB300;
    --event-hover-bg: #333333;
    --filter-btn-bg: #2a2a2a;
    --filter-btn-text: #ffffff;
    --filter-btn-border: #555;
    --footer-border-color: #555;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    margin: 0;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}
.container {
    max-width: 800px;
    margin: auto;
    background: var(--container-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h1 {
    text-align: center;
    color: var(--header-color);
}

#calendar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

#dark-mode-toggle {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-color);
}

.year-selector {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.year-btn {
    padding: 8px 12px;
    border: 1px solid var(--filter-btn-border);
    border-radius: 4px;
    cursor: pointer;
    background-color: var(--filter-btn-bg);
    color: var(--filter-btn-text);
}

.year-btn.selected {
    background-color: var(--selected-bg);
    color: var(--selected-text);
    border-color: var(--selected-bg);
}

.month {
    margin-bottom: 30px;
}

.month h2 {
    color: var(--text-color);
    border-bottom: 2px solid var(--month-header-border);
    padding-bottom: 10px;
}

.event {
    display: flex;
    margin-bottom: 15px;
    align-items: center;
    padding: 10px;
    border-radius: 5px;
    transition: background-color 0.3s;
}

.event:hover {
    background-color: var(--event-hover-bg);
}

.event-date {
    font-weight: bold;
    color: var(--text-color);
    min-width: 250px; /* Adjusted for longer date format */
}

.event-description {
    margin-left: 20px;
}

#filters {
    margin-bottom: 20px;
}

.filter-group {
    margin-bottom: 10px;
}

.filter-group label {
    font-weight: bold;
    display: block;
    margin-bottom: 5px;
}

.filter-container {
    display: flex;
    flex-wrap: wrap;
    gap: 5px;
}

.filter-btn {
    padding: 5px 10px;
    border: 1px solid var(--filter-btn-border);
    border-radius: 15px;
    cursor: pointer;
    background-color: var(--filter-btn-bg);
    color: var(--filter-btn-text);
    font-size: 14px;
}

.filter-btn.selected {
    background-color: var(--selected-bg);
    color: var(--selected-text);
    border-color: var(--selected-bg);
}

footer {
    text-align: center;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--footer-border-color);
}

@media (max-width: 768px) {
    #calendar-header {
        flex-direction: column;
        gap: 15px;
    }
    .header-controls {
        flex-direction: column;
        gap: 15px;
    }
}