:root {
  --color-bg: #1a472a;
  --color-card-bg: #fdfdfd;
  --color-primary: #d42426;
  --color-accent: #f8b229; 
  --color-text: #333;
  --font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  --transition-speed: 0.3s;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  background-image: radial-gradient(
    circle at 50% 50%,
    #2a6f41 0%,
    #1a472a 100%
  );
  color: var(--color-text);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  overflow-x: hidden;
}

.snowflake {
  position: fixed;
  top: -10px;
  color: #fff;
  animation: fall linear infinite;
  z-index: 0;
}

@keyframes fall {
  to {
    transform: translateY(105vh);
  }
}

header {
  text-align: center;
  margin-bottom: 3rem;
  z-index: 1;
  color: #fff;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

h1 {
  font-size: 3rem;
  margin-bottom: 0.5rem;
}

p.subtitle {
  font-size: 1.2rem;
  opacity: 0.9;
}

.gifts-container {
  display: flex;
  gap: 2rem;
  z-index: 1;
  flex-wrap: wrap;
  justify-content: center;
}

.gift-box {
  position: relative;
  width: 150px;
  height: 150px;
  background-color: var(--color-primary);
  border-radius: 8px;
  cursor: pointer;
  transition: transform var(--transition-speed),
    box-shadow var(--transition-speed);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
}

.gift-box:hover {
  transform: translateY(-10px) scale(1.05);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.4);
}

.gift-box::before,
.gift-box::after {
  content: "";
  position: absolute;
  background-color: var(--color-accent);
}

.gift-box::before {
  width: 20px;
  height: 100%;
}

.gift-box::after {
  width: 100%;
  height: 20px;
}

.click-hint {
  position: absolute;
  bottom: -30px;
  color: #fff;
  font-size: 0.9rem;
  opacity: 0;
  transition: opacity var(--transition-speed);
}

.gift-box:hover .click-hint {
  opacity: 1;
}

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-speed);
  z-index: 100;
}

.modal-overlay.active {
  opacity: 1;
  pointer-events: all;
}

.modal-content {
  background: var(--color-card-bg);
  padding: 2rem;
  border-radius: 12px;
  max-width: 500px;
  width: 90%;
  text-align: center;
  position: relative;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
  transform: scale(0.8);
  transition: transform var(--transition-speed);
}

.modal-overlay.active .modal-content {
  transform: scale(1);
}

.close-btn {
  position: absolute;
  top: 10px;
  right: 15px;
  font-size: 1.5rem;
  cursor: pointer;
  color: #888;
  background: none;
  border: none;
}

.close-btn:hover {
  color: var(--color-primary);
}

.message-box {
  font-size: 1.2rem;
  min-height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 1rem 0;
  font-style: italic;
}

.nav-btn {
  background-color: var(--color-primary);
  color: white;
  border: none;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  cursor: pointer;
  margin: 0 5px;
}

.voucher-grid {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.voucher {
  border: 2px dashed var(--color-primary);
  padding: 1rem;
  background: #fff5f5;
  border-radius: 8px;
}

.voucher h3 {
  color: var(--color-primary);
  margin-bottom: 0.5rem;
}

.voucher p {
  font-size: 0.9rem;
  color: #666;
}

.gift-img {
  max-width: 100%;
  border-radius: 8px;
  border: 5px solid var(--color-accent);
}