/* CSN Bio Link - Main Stylesheet */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Poppins', sans-serif;
}

:root {
    --primary: #4a6cfa;
    --secondary: #7e53eb;
    --accent: #ff6b6b;
    --dark: #1e2a4a;
    --light: #f8f9fa;
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
    --glass: rgba(255, 255, 255, 0.1);
    --shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
}

body {
    background: linear-gradient(rgba(30, 42, 74, 0.9), rgba(30, 42, 74, 0.9)),
                url('https://images.unsplash.com/photo-1519681393784-d120267933ba?ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D&auto=format&fit=crop&w=1470&q=80');
    background-size: cover;
    background-attachment: fixed;
    color: var(--light);
    min-height: 100vh;
    overflow-x: hidden;
}

.particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: -1;
}

.particle {
    position: absolute;
    background: var(--accent);
    border-radius: 50%;
    opacity: 0.1;
    animation: float 15s infinite linear;
}

@keyframes float {
    0% { transform: translateY(100vh) rotate(0deg); }
    100% { transform: translateY(-100vh) rotate(360deg); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

header {
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(30, 42, 74, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

header.scrolled {
    background: rgba(30, 42, 74, 0.98);
    padding: 1rem 0;
    box-shadow: var(--shadow);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.8rem;
    font-weight: 700;
    color: white;
    text-decoration: none;
}

.logo i {
    color: var(--accent);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-menu a {
    color: var(--light);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

.nav-menu a:hover {
    color: var(--accent);
    background: rgba(255, 255, 255, 0.1);
}

.auth-buttons {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--light);
    margin: 3px 0;
    transition: 0.3s;
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

.mobile-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(30, 42, 74, 0.98);
    backdrop-filter: blur(15px);
    border-radius: 0 0 15px 15px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1rem;
    z-index: 1000;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.mobile-nav li {
    margin: 0.5rem 0;
}

.mobile-nav a {
    display: block;
    color: var(--light);
    text-decoration: none;
    padding: 1rem;
    border-radius: 8px;
    transition: all 0.3s ease;
    font-weight: 500;
}

.mobile-nav a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--accent);
}

.mobile-auth-buttons {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.mobile-auth-buttons .btn {
    display: block;
    margin: 0.5rem 0;
    text-align: center;
}

.btn {
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    border: none;
    display: inline-block;
}

.btn-login {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--light);
}

.btn-login:hover {
    background: var(--primary);
    transform: translateY(-3px);
}

.btn-signup {
    background: var(--gradient);
    color: white;
}

.btn-signup:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(74, 108, 250, 0.5);
}

main > section {
    padding: 5rem 0;
}

.hero {
    text-align: center;
    padding-top: 6rem;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto 2.5rem auto;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.section-title {
    text-align: center;
    margin-bottom: 3rem;
    font-size: 2.5rem;
}

.features-grid, .pricing-grid, .testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card, .pricing-plan, .testimonial-card, .cta-box {
    background: var(--glass);
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-card:hover, .pricing-plan:hover, .testimonial-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow);
}

.feature-card i {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.feature-card h3, .feature-card h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.pricing-plan.popular {
    border: 2px solid var(--primary);
    transform: scale(1.05);
}

.plan-image {
    width: 100%;
    height: 150px;
    object-fit: cover;
    border-radius: 10px 10px 0 0;
    margin: -2rem -2rem 1rem -2rem;
}

.price {
    font-size: 3rem;
    font-weight: 700;
    margin: 1.5rem 0;
}

.price span {
    font-size: 1rem;
    opacity: 0.7;
}

.plan-features {
    list-style: none;
    margin: 2rem 0;
    text-align: left;
}

.plan-features li {
    padding: 0.8rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.plan-features li i {
    color: var(--accent);
    margin-right: 10px;
}

.testimonial-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--gradient);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
    font-weight: bold;
}

.stars {
    color: #ffd700;
    margin-bottom: 1rem;
}

.testimonial-card strong {
    display: block;
    margin-top: 1rem;
}

.testimonial-card span {
    font-size: 0.9rem;
    opacity: 0.7;
}

.cta-box {
    padding: 4rem 2rem;
}

.cta-box h2 {
    font-size: 2.2rem;
    margin-bottom: 1rem;
}

.cta-box p {
    margin-bottom: 2rem;
    opacity: 0.8;
}

footer {
    padding: 4rem 0 2rem 0;
    background: rgba(0, 0, 0, 0.3);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
    text-align: left;
}

.footer-column h4, .footer-column h5 {
    margin-bottom: 1.5rem;
    font-size: 1.2rem;
}

.footer-column ul {
    list-style: none;
}

.footer-column ul li {
    margin-bottom: 0.8rem;
}

.footer-column a {
    color: #ccc;
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: var(--accent);
}

.footer-social-icons {
    display: flex;
    gap: 1.5rem;
    margin-top: 1rem;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    text-align: center;
}

.footer-bottom p {
    opacity: 0.7;
}

.footer-legal a {
    color: #ccc;
    text-decoration: none;
    margin: 0 0.5rem;
}

.scroll-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    opacity: 0;
    transform: scale(0);
    z-index: 1000;
}

.scroll-top.show {
    opacity: 1;
    transform: scale(1);
}

.scroll-top:hover {
    transform: scale(1.1);
}

.loading {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease;
}

.loading.hide {
    opacity: 0;
    pointer-events: none;
}

.loading-spinner {
    width: 50px;
    height: 50px;
    border: 3px solid rgba(255, 255, 255, 0.1);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Content Pages */
.content-page {
    padding: 4rem 0;
    min-height: calc(100vh - 400px);
}

.content-page .container {
    max-width: 900px;
}

.page-header {
    text-align: center;
    margin-bottom: 3rem;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.page-header p {
    font-size: 1.2rem;
    opacity: 0.8;
}

.content-card {
    background: var(--glass);
    padding: 3rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    margin-bottom: 2rem;
}

.content-card h2 {
    color: var(--light);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid rgba(255, 255, 255, 0.1);
}

.content-card h3 {
    color: var(--light);
    font-size: 1.5rem;
    margin: 2rem 0 1rem 0;
}

.content-card p {
    color: var(--light);
    line-height: 1.8;
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.content-card ul, .content-card ol {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.content-card li {
    margin-bottom: 0.8rem;
    line-height: 1.6;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
}

.stat-card {
    background: var(--glass);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.stat-card .stat-number {
    font-size: 3rem;
    font-weight: 700;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 0.5rem;
}

.stat-card .stat-label {
    font-size: 1rem;
    opacity: 0.8;
}

/* Contact Form */
.contact-form {
    background: var(--glass);
    padding: 3rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--light);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    color: var(--light);
    font-family: 'Poppins', sans-serif;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(255, 255, 255, 0.08);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255, 255, 255, 0.4);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-card {
    background: var(--glass);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.contact-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.contact-card i {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.contact-card h3 {
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.contact-card p, .contact-card a {
    color: var(--light);
    opacity: 0.8;
    text-decoration: none;
}

.contact-card a:hover {
    opacity: 1;
    color: var(--accent);
}

/* Responsive */
@media (max-width: 992px) {
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .section-title {
        font-size: 2rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-column .logo, .footer-social-icons {
        justify-content: center;
    }

    .footer-bottom {
        justify-content: center;
        flex-direction: column;
        gap: 1.5rem;
    }

    .nav-menu {
        display: none;
    }

    .auth-buttons {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .logo {
        font-size: 1.5rem;
    }

    .container {
        padding: 0 15px;
    }

    header {
        padding: 1rem 0;
    }

    .hero {
        padding-top: 4rem;
    }

    .btn {
        padding: 0.7rem 1.2rem;
        font-size: 0.9rem;
    }

    main > section {
        padding: 3rem 0;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .content-card {
        padding: 2rem 1.5rem;
    }
}