/* ===================================
   Data Orbit Lab - Global Styles
   =================================== */

/* CSS Variables */
:root {
    --color-primary: #3B82F6;
    --color-dark: #111827;
    --color-slate: #334155;
    --color-light: #F1F5F9;
    --color-white: #FFFFFF;
    
    --font-heading: 'Satoshi', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --transition: all 0.3s ease;
}

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    background: var(--color-dark);
    color: var(--color-light);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: #60A5FA;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
}

h1 { font-size: clamp(2.5rem, 5vw, 4rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1.125rem; }

p {
    margin-bottom: var(--spacing-md);
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--spacing-lg);
    }
}

/* Section */
.section {
    padding: var(--spacing-xxl) 0;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    margin-bottom: 0;
}

.section-link {
    color: var(--color-primary);
    font-weight: 500;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.section-link:hover {
    gap: 0.75rem;
}

/* Navigation */
.nav {
    background: rgba(17, 24, 39, 0.95);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(51, 65, 85, 0.3);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--color-white);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-white);
    transition: var(--transition);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-menu a {
    color: var(--color-light);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.nav-menu a:hover {
    color: var(--color-primary);
}

.nav-cta {
    padding: 0.5rem 1rem;
    background: var(--color-primary);
    color: var(--color-white) !important;
    border-radius: var(--radius-sm);
}

.nav-cta:hover {
    background: #60A5FA;
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(17, 24, 39, 0.98);
        flex-direction: column;
        padding: var(--spacing-lg);
        gap: var(--spacing-md);
        border-top: 1px solid rgba(51, 65, 85, 0.3);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
}

/* Hero Section */
.hero {
    padding: var(--spacing-xxl) 0;
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 2rem;
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-primary) 0%, #60A5FA 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: #94A3B8;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Orbital Rings Animation */
.hero-visual {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.orbital-rings {
    position: relative;
    width: 400px;
    height: 400px;
}

.ring {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    border: 2px solid rgba(59, 130, 246, 0.2);
    border-radius: 50%;
    animation: rotate 20s linear infinite;
}

.ring-1 {
    width: 300px;
    height: 300px;
    animation-duration: 15s;
}

.ring-2 {
    width: 350px;
    height: 350px;
    animation-duration: 20s;
    animation-direction: reverse;
}

.ring-3 {
    width: 400px;
    height: 400px;
    animation-duration: 25s;
}

@keyframes rotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.data-node {
    position: absolute;
    width: 12px;
    height: 12px;
    background: var(--color-primary);
    border-radius: 50%;
    box-shadow: 0 0 20px rgba(59, 130, 246, 0.6);
    animation: pulse 2s ease-in-out infinite;
}

.node-1 {
    top: 20%;
    left: 50%;
    animation-delay: 0s;
}

.node-2 {
    top: 50%;
    right: 15%;
    animation-delay: 0.7s;
}

.node-3 {
    bottom: 20%;
    left: 20%;
    animation-delay: 1.4s;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        opacity: 1;
    }
    50% {
        transform: scale(1.3);
        opacity: 0.7;
    }
}

@media (max-width: 968px) {
    .hero .container {
        grid-template-columns: 1fr;
    }
    
    .hero-visual {
        height: 300px;
    }
    
    .orbital-rings {
        width: 300px;
        height: 300px;
    }
    
    .ring-1 { width: 200px; height: 200px; }
    .ring-2 { width: 250px; height: 250px; }
    .ring-3 { width: 300px; height: 300px; }
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.875rem 1.75rem;
    font-weight: 600;
    font-size: 1rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: #60A5FA;
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--color-white);
    border: 2px solid var(--color-slate);
}

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

/* Article Cards */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.article-card {
    background: rgba(51, 65, 85, 0.2);
    border: 1px solid rgba(51, 65, 85, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: var(--transition);
    cursor: pointer;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(59, 130, 246, 0.5);
}

.article-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
}

.article-category {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: 2rem;
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 600;
}

.article-date {
    color: #94A3B8;
    font-size: 0.875rem;
}

.article-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.article-excerpt {
    color: #CBD5E1;
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
}

.article-link {
    color: var(--color-primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition);
}

.article-link:hover {
    gap: 0.75rem;
}

/* Categories Grid */
.categories-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.category-card {
    background: rgba(51, 65, 85, 0.2);
    border: 1px solid rgba(51, 65, 85, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: var(--transition);
    cursor: pointer;
}

.category-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(59, 130, 246, 0.5);
    background: rgba(59, 130, 246, 0.05);
}

.category-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.category-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.category-desc {
    color: #94A3B8;
    font-size: 0.95rem;
    margin-bottom: 0;
}

/* Newsletter Section */
.newsletter-section {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(59, 130, 246, 0.05) 100%);
}

.newsletter-card {
    background: rgba(51, 65, 85, 0.3);
    border: 1px solid rgba(59, 130, 246, 0.3);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xxl);
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.newsletter-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: var(--spacing-md);
}

.newsletter-text {
    color: #CBD5E1;
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.newsletter-form {
    display: flex;
    gap: var(--spacing-md);
    max-width: 500px;
    margin: 0 auto;
    flex-wrap: wrap;
}

.newsletter-input {
    flex: 1;
    min-width: 250px;
    padding: 0.875rem 1.25rem;
    background: rgba(17, 24, 39, 0.5);
    border: 1px solid rgba(51, 65, 85, 0.5);
    border-radius: var(--radius-md);
    color: var(--color-white);
    font-size: 1rem;
    transition: var(--transition);
}

.newsletter-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

/* Disclaimer */
.disclaimer-section {
    background: rgba(51, 65, 85, 0.2);
    border-top: 1px solid rgba(51, 65, 85, 0.3);
    border-bottom: 1px solid rgba(51, 65, 85, 0.3);
}

.disclaimer {
    max-width: 900px;
    margin: 0 auto;
}

.disclaimer-text {
    color: #94A3B8;
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 0;
}

.disclaimer-text strong {
    color: var(--color-white);
}

/* Footer */
.footer {
    background: var(--color-dark);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
    border-top: 1px solid rgba(51, 65, 85, 0.3);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-title {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
}

.footer-text {
    color: #94A3B8;
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
}

.footer-contact {
    color: #94A3B8;
    font-size: 0.95rem;
}

.footer-contact p {
    margin-bottom: 0.5rem;
}

.footer-contact a {
    color: var(--color-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: #94A3B8;
    font-size: 0.95rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--color-primary);
    padding-left: 0.25rem;
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(51, 65, 85, 0.3);
}

.footer-copyright {
    color: #64748B;
    font-size: 0.875rem;
    margin-bottom: 0;
}

/* Utility Classes */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

/* Responsive */
@media (max-width: 768px) {
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .hero-cta {
        flex-direction: column;
        width: 100%;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .newsletter-form {
        flex-direction: column;
    }
    
    .newsletter-input {
        width: 100%;
    }
}