:root {
  --bg-color: #0f1113;
  --card-bg: #14171a;
  --text-color: #e6eef8;
  --muted-color: #9fb0c8;
  --accent-color: #2b9cff;
  --accent-hover: #1a8bff;
  --success-color: #4caf50;
  --error-color: #f44336;
  --grid-line: #333;
  --card-radius: 12px;
  --pill-radius: 30px;
  --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  padding: 20px;
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: var(--font-main);
  display: flex;
  flex-direction: column;
  align-items: center;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

.wrap {
  width: 100%;
  max-width: 800px;
  margin: 0 auto;
}

/* Header & Title */
header {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 15px;
  margin-bottom: 20px;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: monospace;
}

.iconbtn {
  text-decoration: none;
  color: var(--text-color);
  transition: opacity 0.2s;
}

.iconbtn:hover { opacity: 0.7; }

/* Date Navigation */
.date-nav {
  display: flex;
  align-items: center;
  gap: 15px;
  background: var(--card-bg);
  padding: 10px 20px;
  border-radius: var(--pill-radius);
  box-shadow: 0 4px 6px rgba(0,0,0,0.3);
  user-select: none;
}

button.nav-btn {
  background: none;
  border: none;
  color: var(--muted-color);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 5px 10px;
  transition: transform 0.1s, color 0.1s;
  width: auto;
  height: auto;
  font-weight: normal;
}

button.nav-btn:hover:not(:disabled) {
  background: none;
  color: #fff;
  transform: scale(1.2);
}

button.nav-btn:disabled {
  background: none;
  color: #333;
  cursor: default;
}

#date-display {
  font-weight: bold;
  font-size: 1.1rem;
  min-width: 120px;
  text-align: center;
  cursor: pointer;
}

input[type="date"] {
  position: absolute;
  visibility: hidden;
  width: 0; height: 0;
}

/* Common Buttons */
button, .btn {
  background-color: var(--accent-color);
  color: #02111a;
  border: none;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s, transform 0.1s;
}

button:hover:not(:disabled),
.btn:hover:not(:disabled) {
  background-color: var(--accent-hover);
  transform: translateY(-1px);
}

button:active:not(:disabled),
.btn:active:not(:disabled) { transform: translateY(0); }

button:disabled,
.btn:disabled {
  background-color: #333;
  color: #777;
  cursor: not-allowed;
}

.btn-secondary {
  background-color: #2b2f31;
  color: #fff;
}

.btn-secondary:hover:not(:disabled) { background-color: #3b3f41; }

/* Stats Container */
.stats-container {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  margin-top: 30px;
  width: 100%;
  text-align: center;
}

.stat-box {
  background: var(--card-bg);
  padding: 15px 10px;
  border-radius: 10px;
  text-align: center;
  border: 1px solid rgba(255,255,255,0.05);
}

.stat-value {
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 5px;
}

.stat-label {
  font-size: 0.7rem;
  color: var(--muted-color);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Toast / Notifications */
.toast {
  position: fixed;
  top: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: #222;
  color: #fff;
  padding: 12px 24px;
  border-radius: 8px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.5);
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s, top 0.3s;
}

.toast.show {
  opacity: 1;
  visibility: visible;
  top: 40px;
}

.toast.success { border-left: 4px solid var(--success-color); }
.toast.error { border-left: 4px solid var(--error-color); }

/* Animations */
@keyframes celebrate {
  0% { transform: scale(1) rotate(0deg); filter: hue-rotate(0deg); }
  25% { transform: scale(1.1) rotate(-5deg); filter: hue-rotate(90deg); }
  50% { transform: scale(1) rotate(5deg); filter: hue-rotate(180deg); }
  75% { transform: scale(1.1) rotate(-3deg); filter: hue-rotate(270deg); }
  100% { transform: scale(1) rotate(0deg); filter: hue-rotate(360deg); }
}

.win-animation {
  animation: celebrate 2.5s ease-in-out infinite;
}

/* Help Button */
.help-btn {
  background: #1e2428;
  color: #fff;
  border: 1px solid rgba(255,255,255,0.3);
  width: 28px;
  height: 28px !important;
  padding: 0 !important;
  border-radius: 50% !important;
  font-size: 16px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  margin-left: 10px;
  vertical-align: middle;
  transition: background .2s;
  font-weight: bold;
}

.help-btn:hover { background: rgba(255,255,255,0.1); }

/* Help Overlay */
.help-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.85);
  z-index: 999;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .2s;
  backdrop-filter: blur(2px);
}

.help-overlay.show {
  opacity: 1;
  pointer-events: auto;
}

.help-content {
  background: var(--card-bg);
  padding: 24px;
  border-radius: 12px;
  max-width: 90%;
  width: 360px;
  position: relative;
  border: 1px solid rgba(255,255,255,0.1);
  line-height: 1.5;
  box-shadow: 0 10px 25px rgba(0,0,0,0.5);
}

.help-close {
  position: absolute;
  top: 8px;
  right: 8px;
  background: transparent !important;
  border: none !important;
  color: var(--muted-color);
  font-size: 24px;
  cursor: pointer;
  padding: 4px !important;
  line-height: 1;
  width: auto !important;
  height: auto !important;
}

.help-close:hover { color: #fff; }

.help-title {
  font-size: 20px;
  margin: 0 0 12px;
  color: #fff;
  font-family: monospace;
  border-bottom: 1px solid rgba(255,255,255,0.1);
  padding-bottom: 8px;
}

.help-content ul { padding-left: 20px; margin: 0 0 12px; color: var(--muted-color); }
.help-content li { margin-bottom: 6px; }
.help-content p { margin: 0 0 12px; color: var(--muted-color); }

@media (max-width: 500px) {
  body { padding: 15px; }
  h1 { font-size: 1.2rem; }
  .date-nav { gap: 8px; padding: 8px 15px; }
  #date-display { font-size: 1rem; min-width: 100px; }
  .stat-value { font-size: 1rem; }
}