* {
  margin: 0;
  padding: 0;

}

body {
  background-color: #f1f2f3;
}

.container {
  box-sizing: border-box;
  width: 100%;
  max-width: 1560px;
  min-width: 1240px;
  margin: 20px auto;
  color: #333;
}

.container * {
  box-sizing: border-box;
}

header {
  text-align: center;
  margin-bottom: 25px;
}

header h1 {
  font-size: 32px;
  margin-bottom: 5px;
}

header p{
  font-size: 18px;
  font-weight: 300;
  max-width: 95%;
  margin: 0 auto;
  line-height: 1.6;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
    margin-bottom: 40px;
}

.platform-card {
    background: white;
    border-radius: 12px;
    padding: 24px;
    cursor: pointer;
    transition: all 0.3s ease;
    border: 2px solid transparent;
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.platform-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
    border-color: #667eea;
}

.platform-card.domestic {
    background: linear-gradient(135deg, #fff3e0, #ffe0b2);
    border-left: 4px solid #ff9800;
}

.platform-card.domestic:hover {
    border-color: #ff9800;
}

.platform-name {
    font-size: 1.1rem;
    font-weight: 600;
    color: #2c3e50;
}

.footer-section {
    background: white;
    border-radius: 12px;
    padding: 30px;
    margin-top: 40px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}

.feature-item {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    border-radius: 8px;
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-2px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 10px;
}

.feature-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
    color: #2c3e50;
}

.feature-desc {
    font-size: 0.9rem;
    color: #666;
    line-height: 1.4;
}

.legend-tag {
    display: flex;
    gap: 20px;
    justify-content: center;
    margin-bottom: 20px;
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: #666;
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
    background: #3f7eff;
}

.legend-color.domestic {
    background: #ff9800;
}

.footer-actions {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid #eee;
}

.footer-text {
    color: #666;
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.notice-container {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 1000;
    max-width: 400px;
}

.notice {
    background: #4caf50;
    color: white;
    padding: 12px 20px;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    display: none;
    align-items: center;
    gap: 10px;
    animation: slideUp 0.3s ease;
}

.notice.error {
    background: #f44336;
}

.notice.warning {
    background: #ff9800;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.intro-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.intro-card {
    background: white;
    border-radius: 12px;
    padding: 25px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    display: flex;
    align-items: flex-start;
    gap: 15px;
    transition: transform 0.3s ease;
}

.intro-card:hover {
    transform: translateY(-2px);
}

.intro-icon {
    font-size: 2.5rem;
    flex-shrink: 0;
}

.intro-content h3 {
    font-size: 1.3rem;
    font-weight: 600;
    color: #2c3e50;
    margin-bottom: 10px;
}

.intro-content p {
    color: #666;
    line-height: 1.6;
    font-size: 0.95rem;
}

.search-box {
    margin-bottom: 30px;
    position: relative;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

.search-input {
    width: 100%;
    padding: 15px 50px 15px 20px;
    border: 2px solid #e0e0e0;
    border-radius: 25px;
    font-size: 1rem;
    background: white;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.search-input:focus {
    outline: none;
    border-color: #667eea;
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1), 0 4px 12px rgba(0, 0, 0, 0.1);
}

.search-input::placeholder {
    color: #999;
    font-weight: 400;
}

.search-icon {
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.2rem;
    color: #667eea;
    pointer-events: none;
}

.platform-tag {
    display: inline-block;
    padding: 2px 8px;
    background: #e3f2fd;
    color: #1976d2;
    border-radius: 4px;
    font-size: 0.8rem;
    margin-left: 8px;
    font-weight: 500;
}

.platform-card.domestic .platform-tag {
    background: #fff3e0;
    color: #f57c00;
}