/* CSS Variables (Design Tokens) */
:root {
    --color-white: #FFFFFF;
    --color-text-primary: #111827;
    --color-text-secondary: #4B5563;
    --color-primary-blue: #2563EB;
    --color-accent-yellow: #FFC21A;
    --color-footer-bg: #0069A8;
    --color-banner-bg: #E6EDFF;
}

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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--color-text-primary);
    line-height: 1.5;
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    width: 100%;
    height: 72px;
    background: var(--color-white);
    box-shadow: 0px 1px 2px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    padding: 0 24px;
    max-width: 1440px;
    margin: 0 auto;
}

.logo {
    width: 116px;
    height: 40px;
    background-image: url('/images/pi-drive-chip/logo.png');
    background-size: contain;
    background-repeat: no-repeat;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

.btn-register {
    padding: 8px 24px;
    background-color: var(--color-primary-blue);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}

/* Applications Section */
.applications {
    padding: 64px 0;
    background: white;
}

.section-header {
    text-align: center;
    margin-bottom: 32px;
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 20px;
    color: var(--color-text-secondary);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    padding: 0 24px;
}

.card {
    border-radius: 16px;
    padding: 24px;
    transition: transform 0.3s ease;
}

.card a{
    color: #000;
    text-decoration: none;
}

.card a:hover{
    text-decoration: none;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card-solar { background: linear-gradient(135deg, #FEFCE8, #FFF7ED); }
.card-motor { background: linear-gradient(135deg, #F0FDF4, #F0FDFA); }
.card-power { background: linear-gradient(135deg, #EFF6FF, #EEF2FF); }
.card-railway { background: linear-gradient(135deg, #FAF5FF, #FDF2F8); }
.card-wind { background: linear-gradient(135deg, #ECFEFF, #EFF6FF); }
.card-other { background: linear-gradient(135deg, #F6F6F6, #F8FAFC); }

.card-image {
    width: 100%;
    height: 192px;
    border-radius: 12px;
    background-size: cover;
    margin-bottom: 16px;
}

.card-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 8px;
}

.card-description {
    font-size: 16px;
    color: var(--color-text-secondary);
}


/* Responsive Design */
@media (max-width: 1200px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .banner-title {
        font-size: 56px;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .steps-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    
    .section-title {
        font-size: 24px;
    }
    
    .card {
        padding: 16px;
    }
}