/* BIS Student Portal - Landing Page Styles */

:root {
    /* BIS Theme Colors */
    --bis-primary: #1e3a5f;
    --bis-secondary: #2c5282;
    --bis-accent: #4a9eff;
    --bis-light: #63b3ed;
    --bis-dark: #0f2744;
    --bis-gradient-start: #1a365d;
    --bis-gradient-end: #2563eb;
    
    /* UI Colors */
    --bg-main: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1a202c;
    --text-secondary: #64748b;
    --border: #e2e8f0;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

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

body {
    font-family: 'Poppins', sans-serif;
    background: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--bis-gradient-start) 0%, var(--bis-gradient-end) 100%);
    padding: 4rem 2rem;
    text-align: center;
    position: relative;
    overflow: hidden;
    animation: fadeIn 0.8s ease-out;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(74, 158, 255, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(99, 179, 237, 0.15) 0%, transparent 50%);
    pointer-events: none;
}

.hero-container {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.logo-container {
    margin-bottom: 2rem;
    animation: logoFloat 3s ease-in-out infinite;
}

@keyframes logoFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.hero-logo {
    width: 120px;
    height: 120px;
    object-fit: contain;
    filter: drop-shadow(0 10px 30px rgba(0, 0, 0, 0.3));
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
    text-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
    letter-spacing: -1px;
    animation: slideUp 0.8s ease-out 0.2s both;
}

.hero-subtitle {
    font-size: clamp(1.1rem, 3vw, 1.3rem);
    color: rgba(255, 255, 255, 0.95);
    font-weight: 400;
    margin-bottom: 2rem;
    animation: slideUp 0.8s ease-out 0.4s both;
}

.hero-badge {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: 50px;
    color: white;
    font-weight: 600;
    font-size: 0.95rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    animation: slideUp 0.8s ease-out 0.6s both;
}

/* Services Section */
.services-section {
    padding: 5rem 2rem;
    background: var(--bg-main);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: clamp(2rem, 5vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    color: var(--bis-primary);
    margin-bottom: 1rem;
    animation: fadeIn 0.8s ease-out;
}

.section-subtitle {
    font-size: 1.1rem;
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    animation: fadeIn 0.8s ease-out 0.2s both;
}

.service-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.service-card {
    background: white;
    border-radius: 24px;
    padding: 2.5rem;
    text-decoration: none;
    color: var(--text-primary);
    box-shadow: var(--shadow-lg);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
    animation: slideUp 0.8s ease-out both;
}

.service-card:nth-child(1) {
    animation-delay: 0.3s;
}

.service-card:nth-child(2) {
    animation-delay: 0.5s;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--bis-accent), var(--bis-light));
    transform: scaleX(0);
    transition: transform 0.4s ease;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-2xl);
    border-color: var(--bis-accent);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.card-icon {
    font-size: 4rem;
    margin-bottom: 1.5rem;
    display: inline-block;
    transition: transform 0.4s ease;
}

.service-card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
}

.card-title {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--bis-primary);
}

.card-description {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
}

.card-features {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.feature-tag {
    padding: 0.4rem 0.9rem;
    background: var(--bg-main);
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--bis-primary);
    border: 1px solid var(--border);
}

.card-arrow {
    font-size: 1.5rem;
    color: var(--bis-accent);
    font-weight: 700;
    transition: transform 0.3s ease;
}

.service-card:hover .card-arrow {
    transform: translateX(5px);
}

/* FAQ Section */
.faq-section {
    padding: 5rem 2rem;
    background: white;
}

.faq-container {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    margin-bottom: 1rem;
    border-radius: 16px;
    overflow: hidden;
    border: 2px solid var(--border);
    transition: all 0.3s ease;
    animation: slideUp 0.6s ease-out both;
}

.faq-item:nth-child(1) { animation-delay: 0.1s; }
.faq-item:nth-child(2) { animation-delay: 0.2s; }
.faq-item:nth-child(3) { animation-delay: 0.3s; }
.faq-item:nth-child(4) { animation-delay: 0.4s; }
.faq-item:nth-child(5) { animation-delay: 0.5s; }

.faq-item:hover {
    border-color: var(--bis-accent);
    box-shadow: var(--shadow-md);
}

.faq-question {
    width: 100%;
    padding: 1.5rem 2rem;
    background: white;
    border: none;
    text-align: left;
    font-family: 'Poppins', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--bis-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
    transition: all 0.3s ease;
}

.faq-question:hover {
    background: var(--bg-main);
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: 300;
    color: var(--bis-accent);
    transition: transform 0.3s ease;
    flex-shrink: 0;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s ease, padding 0.4s ease;
    background: var(--bg-main);
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 1.5rem 2rem;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin: 0;
}

/* Footer */
.footer {
    background: linear-gradient(135deg, var(--bis-dark) 0%, var(--bis-primary) 100%);
    color: white;
    padding: 3rem 2rem 2rem 2rem;
}

.footer-content {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-logo-img {
    width: 50px;
    height: 50px;
    object-fit: contain;
}

.footer-brand {
    font-size: 1.3rem;
    font-weight: 700;
}

.footer-links {
    display: flex;
    gap: 2rem;
    flex-wrap: wrap;
}

.footer-link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.footer-link:hover {
    color: var(--bis-light);
    transform: translateY(-2px);
}

.footer-social {
    display: flex;
    gap: 1rem;
}

.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-link:hover {
    background: var(--bis-accent);
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(74, 158, 255, 0.4);
}

.social-icon {
    width: 20px;
    height: 20px;
}

.footer-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 2rem 0;
}

.footer-bottom {
    text-align: center;
}

.copyright {
    font-size: 1rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.disclaimer {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.7);
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero-section {
        padding: 3rem 1.5rem;
    }

    .hero-logo {
        width: 90px;
        height: 90px;
    }

    .services-section {
        padding: 3rem 1.5rem;
    }

    .service-cards {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .service-card {
        padding: 2rem;
    }

    .faq-section {
        padding: 3rem 1.5rem;
    }

    .faq-question {
        padding: 1.2rem 1.5rem;
        font-size: 1rem;
    }

    .faq-item.active .faq-answer {
        padding: 1.2rem 1.5rem;
    }

    .footer-content {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }

    .footer-social {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-badge {
        font-size: 0.85rem;
        padding: 0.6rem 1.5rem;
    }

    .card-icon {
        font-size: 3rem;
    }

    .card-title {
        font-size: 1.5rem;
    }

    .feature-tag {
        font-size: 0.75rem;
        padding: 0.35rem 0.75rem;
    }
}