/*
 * SectorFlux Landing Page
 * Copyright (c) 2025 ParticleSector.com
 * Dual-licensed: GPL-3.0 / Commercial
 */

/* ============================================
   CSS Variables - ParticleSector Branding
   ============================================ */
:root {
    --bg-primary: #0f0f23;
    --bg-secondary: #1a1a2e;
    --bg-card: #16213e;
    --bg-card-hover: #1f2b47;

    --accent-cyan: #06b6d4;
    --accent-blue: #3b82f6;
    --accent-purple: #8b5cf6;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --gradient-primary: linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
    --gradient-accent: linear-gradient(135deg, var(--accent-blue), var(--accent-purple));

    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-glow: 0 0 40px rgba(6, 182, 212, 0.15);

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, monospace;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
}

/* ============================================
   Reset & Base Styles
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

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

a {
    color: var(--accent-cyan);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* ============================================
   Particle Canvas
   ============================================ */
#particles {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

/* ============================================
   Container
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

/* ============================================
   Navigation
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(15, 15, 35, 0.8);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
}

.logo {
    font-size: 1.5rem;
}

.brand-name {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: color 0.2s ease;
}

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

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-xl);
    font-weight: 600;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
}

.btn .icon {
    width: 18px;
    height: 18px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--bg-primary);
    box-shadow: 0 4px 20px rgba(6, 182, 212, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(6, 182, 212, 0.4);
    color: var(--bg-primary);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--accent-cyan);
}

.btn-secondary:hover {
    background: rgba(6, 182, 212, 0.1);
    color: var(--text-primary);
}

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

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--accent-cyan);
    color: var(--text-primary);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 8rem 2rem 4rem;
    position: relative;
}

.hero-content {
    max-width: 800px;
    z-index: 1;
}

.hero-title {
    font-size: clamp(3rem, 8vw, 5rem);
    font-weight: 900;
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 500;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 2rem;
}

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

.hero-note {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ============================================
   Section Styles
   ============================================ */
section {
    padding: 6rem 0;
    position: relative;
    z-index: 1;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    text-align: center;
    max-width: 600px;
    margin: 0 auto 3rem;
}

/* ============================================
   Features Section
   ============================================ */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 1.5rem;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all 0.3s ease;
}

.feature-card:hover {
    background: var(--bg-card-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
    border-color: rgba(6, 182, 212, 0.3);
}

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

.feature-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

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

/* ============================================
   Quick Start Section
   ============================================ */
.quickstart {
    background: var(--bg-primary);
}

.code-comparison {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.code-arrow {
    font-size: 2rem;
    color: var(--accent-cyan);
    font-weight: bold;
}

.code-block {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    min-width: 350px;
    flex: 1;
    max-width: 450px;
}

.code-block.highlight {
    border-color: var(--accent-cyan);
    box-shadow: 0 0 30px rgba(6, 182, 212, 0.2);
}

.code-header {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 1px solid var(--border-color);
}

.code-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.code-dot.red { background: #ff5f56; }
.code-dot.yellow { background: #ffbd2e; }
.code-dot.green { background: #27c93f; }

.code-title {
    margin-left: auto;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.code-block pre {
    padding: 1.5rem;
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.6;
}

.code-comment {
    color: var(--text-muted);
}

.code-string {
    color: var(--accent-cyan);
}

.quickstart-note {
    text-align: center;
    color: var(--text-secondary);
}

.quickstart-note code {
    background: var(--bg-card);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    color: var(--accent-cyan);
}

/* ============================================
   Screenshots Section
   ============================================ */
.screenshots {
    background: var(--bg-secondary);
}

.screenshot-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 2rem;
}

.screenshot-item {
    text-align: center;
}

.screenshot-item h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.screenshot-wrapper {
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.screenshot-wrapper:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-glow), 0 20px 60px rgba(0, 0, 0, 0.5);
}

.screenshot-wrapper img {
    width: 100%;
    height: auto;
    display: block;
}

.screenshot-item p {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ============================================
   Pro Teaser Section
   ============================================ */
.pro-teaser {
    background: var(--gradient-accent);
    padding: 5rem 0;
    text-align: center;
}

.pro-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-xl);
    font-size: 0.85rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    margin-bottom: 1.5rem;
}

.pro-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: white;
    margin-bottom: 1rem;
}

.pro-description {
    font-size: 1.25rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 2rem;
}

.pro-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1rem;
}

.pro-feature {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 0.75rem 1.25rem;
    border-radius: var(--radius-xl);
    font-size: 0.95rem;
    color: white;
}

/* ============================================
   Community Section
   ============================================ */
.community {
    background: var(--bg-primary);
    text-align: center;
}

.signup-form {
    display: flex;
    gap: 1rem;
    max-width: 500px;
    margin: 0 auto 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.signup-form input {
    flex: 1;
    min-width: 250px;
    padding: 1rem 1.5rem;
    border-radius: var(--radius-xl);
    border: 2px solid var(--border-color);
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.3s ease;
}

.signup-form input:focus {
    border-color: var(--accent-cyan);
}

.signup-form input::placeholder {
    color: var(--text-muted);
}

.signup-form button {
    padding: 1rem 2rem;
    border-radius: var(--radius-xl);
    background: var(--gradient-primary);
    color: var(--bg-primary);
    font-size: 1rem;
    font-weight: 700;
    border: none;
    cursor: pointer;
    transition: all 0.3s ease;
}

.signup-form button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(6, 182, 212, 0.4);
}

.signup-form button.success {
    background: #10b981;
}

.signup-note {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--bg-secondary);
    padding: 3rem 0 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 2rem;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.25rem;
    font-weight: 700;
}

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

.footer-links a {
    color: var(--text-secondary);
    transition: color 0.2s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .nav {
        padding: 1rem;
    }

    .nav-links {
        display: none;
    }

    .hero {
        padding: 6rem 1rem 3rem;
    }

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

    .code-comparison {
        flex-direction: column;
    }

    .code-arrow {
        transform: rotate(90deg);
    }

    .code-block {
        min-width: 100%;
    }

    .screenshot-grid {
        grid-template-columns: 1fr;
    }

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

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