:root {
    --bg-primary: #0a0b10;
    --bg-secondary: #13151f;
    --text-primary: #ffffff;
    --text-secondary: #a0a4b8;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.05);
    --font-main: 'Outfit', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

html {
    scroll-behavior: smooth;
}

/* Background Blobs for styling */
.blob {
    position: absolute;
    filter: blur(80px);
    z-index: -1;
    opacity: 0.5;
    border-radius: 50%;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, var(--accent-primary) 0%, transparent 70%);
}

.blob-2 {
    top: 40%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-secondary) 0%, transparent 70%);
}

/* Typography */
h1, h2, h3 {
    line-height: 1.2;
    margin-bottom: 1rem;
}

.gradient-text {
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Glassmorphism */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(99, 102, 241, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-outline {
    border: 1px solid var(--text-secondary);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 1rem 0;
    background: rgba(10, 11, 16, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--glass-border);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    text-decoration: none;
    color: var(--text-primary);
    font-size: 1.2rem;
    font-weight: 700;
}

.nav-logo {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a:not(.btn) {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover:not(.btn) {
    color: var(--text-primary);
}

/* Section Common */
.section-padding {
    padding: 5rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

.section-header p {
    color: var(--text-secondary);
}

/* Hero Section */
.hero {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    min-height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 2rem 2rem;
}

.badge {
    display: inline-block;
    padding: 0.4rem 1rem;
    background: rgba(99, 102, 241, 0.1);
    color: var(--accent-primary);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: 4rem;
    margin-bottom: 1.5rem;
}

.hero-subtitle {
    color: var(--text-secondary);
    font-size: 1.2rem;
    margin-bottom: 2rem;
    max-width: 90%;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
}

.downloads-counter {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border-radius: 12px;
}

.download-icon {
    font-size: 2rem;
    background: linear-gradient(90deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.download-stats {
    display: flex;
    flex-direction: column;
}

.download-stats .count {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

.download-stats .label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.hero-image-wrapper {
    padding: 1rem;
    text-align: center;
}

.hero-image {
    max-width: 300px;
    border-radius: 24px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.4);
}

/* Features */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Showcase */
.showcase-scroll {
    display: flex;
    gap: 2rem;
    overflow-x: auto;
    padding-bottom: 2rem;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-primary) var(--bg-secondary);
}

.showcase-scroll::-webkit-scrollbar {
    height: 8px;
}

.showcase-scroll::-webkit-scrollbar-thumb {
    background: var(--accent-primary);
    border-radius: 4px;
}

.showcase-img {
    height: 500px;
    border-radius: 20px;
    flex-shrink: 0;
    border: 1px solid var(--glass-border);
}

/* Calculator */
.calculator-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    padding: 3rem;
    align-items: center;
}

.formula-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: 1.5rem;
}

.formula-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0.25rem 0 0.5rem 0;
}

/* FAQ Accordion */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.faq-item {
    padding: 1.25rem 1.5rem;
    cursor: pointer;
    transition: background 0.3s ease;
}

.faq-item summary {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--accent-primary);
    transition: transform 0.3s ease;
}

.faq-item[open] summary::after {
    content: '−';
    transform: rotate(180deg);
}

.faq-answer {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Installation Guide */
.install-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.install-card {
    padding: 2.5rem;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.install-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
}

.install-steps {
    margin-left: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.install-steps code, .req-text {
    color: var(--accent-primary);
    font-size: 0.9rem;
}

.req-text {
    margin-bottom: 1rem;
}

.code-block {
    background: #050608;
    padding: 1.2rem;
    border-radius: 8px;
    border: 1px solid var(--glass-border);
    color: #4ade80;
    font-family: monospace;
    font-size: 0.85rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.btn-full {
    text-align: center;
    width: 100%;
}

@media (max-width: 800px) {
    .install-grid {
        grid-template-columns: 1fr;
    }
}

.formula-box code {
    color: var(--accent-primary);
    font-family: monospace;
    font-size: 1.1rem;
    display: block;
    margin-top: 0.5rem;
}

.rounded-img {
    width: 100%;
    max-width: 350px;
    border-radius: 16px;
    margin: 0 auto;
    display: block;
}

/* Footer */
.footer {
    border-top: 1px solid var(--glass-border);
    padding: 4rem 2rem 2rem;
    background: var(--bg-secondary);
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 2rem;
}

.footer-brand h3 {
    margin: 0.5rem 0;
}

.footer-brand p {
    color: var(--text-secondary);
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--text-primary);
}

.footer-bottom {
    max-width: 1200px;
    margin: 2rem auto 0;
    padding-top: 2rem;
    border-top: 1px solid var(--glass-border);
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transition: opacity 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
}

.slide-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

.slide-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }
.delay-3 { transition-delay: 0.6s; }

/* Responsive */
@media (max-width: 900px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: 8rem;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-subtitle {
        margin: 0 auto 2rem;
    }
    
    .hero-cta {
        justify-content: center;
    }
    
    .calculator-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 600px) {
    .nav-links {
        display: none; /* simple mobile fallback */
    }
    .hero-title {
        font-size: 2.5rem;
    }
    .calculator-container {
        padding: 1.5rem;
    }
}