:root {
    /* Gravitational Light Mode */
    --bg-color: #f1f5f9;
    --bg-panel: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --plasma-violet: #8b5cf6;
    --electric-cyan: #0284c7;
    --card-bg: rgba(255, 255, 255, 0.85);
    --card-border: #cbd5e1;
    --nav-bg: rgba(241, 245, 249, 0.85);
    --grid-color: rgba(2, 132, 199, 0.1);
    --turbine-speed: 2s;
    --throttle-percent: 10;
}

[data-theme="dark"] {
    /* Deep Titanium Black & Plasma */
    --bg-color: #0b0c10;
    --bg-panel: #11141a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --plasma-violet: #7c3aed;
    --electric-cyan: #00d2ff;
    --card-bg: rgba(15, 17, 24, 0.7);
    --card-border: #1f222e;
    --nav-bg: rgba(11, 12, 16, 0.85);
    --grid-color: rgba(124, 58, 237, 0.08);
}

/* Base */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: 'Space Mono', 'Consolas', system-ui, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a { text-decoration: none; color: inherit; }

/* Background Canvas */
#vortex-canvas {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    z-index: -1;
    pointer-events: none;
    opacity: 0.8;
}
/* Vector Grid fallback */
body::before {
    content: ''; position: fixed; top:0; left:0; width:100%; height:100%;
    background-image: linear-gradient(var(--grid-color) 1px, transparent 1px),
                      linear-gradient(90deg, var(--grid-color) 1px, transparent 1px);
    background-size: 40px 40px;
    z-index: -2; pointer-events: none; opacity: 0.5;
}

/* Nav */
.plasma-nav {
    position: fixed; top: 0; width: 100%;
    background-color: var(--nav-bg);
    border-bottom: 1px solid var(--card-border);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
}
.nav-container {
    max-width: 1400px; margin: 0 auto; padding: 1rem 2rem;
    display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap;
}
.logo { font-size: 1.3rem; font-weight: 800; color: var(--electric-cyan); text-transform: uppercase; letter-spacing: 1px; }
.nav-links { display: flex; gap: 2rem; }
.nav-links a { font-size: 0.95rem; font-weight: 500; transition: color 0.2s, text-shadow 0.2s; }
.nav-links a:hover { color: var(--electric-cyan); text-shadow: 0 0 10px var(--electric-cyan); }
.glow-text { color: var(--plasma-violet); font-weight: bold; text-shadow: 0 0 8px var(--plasma-violet); }
.glow-text:hover { color: var(--electric-cyan) !important; text-shadow: 0 0 8px var(--electric-cyan) !important; }

.nav-actions { display: flex; align-items: center; gap: 1.5rem; }

/* Buttons */
.plasma-btn {
    display: inline-block; padding: 0.8rem 1.8rem;
    border-radius: 4px; font-weight: bold; font-size: 1rem;
    text-transform: uppercase; letter-spacing: 1px;
    cursor: pointer; transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative; z-index: 1; text-align: center;
}
.plasma-btn.outline {
    background: transparent; color: var(--electric-cyan);
    border: 1px solid var(--electric-cyan);
}
.plasma-btn.outline:hover {
    background: rgba(0, 210, 255, 0.1);
    box-shadow: 0 0 15px rgba(0, 210, 255, 0.3);
}
.plasma-btn.primary {
    background: linear-gradient(45deg, var(--plasma-violet), var(--electric-cyan));
    color: #fff; border: none;
    box-shadow: 0 0 20px rgba(124, 58, 237, 0.5);
}
.plasma-btn.primary:hover {
    transform: scale(1.05);
    box-shadow: 0 0 30px rgba(0, 210, 255, 0.8);
}
.plasma-btn.full { width: 100%; }

/* Hero */
.hero-plasma {
    padding: 12rem 2rem 6rem;
    min-height: 90vh;
    display: flex; align-items: center; justify-content: center;
    position: relative;
}
.hero-content {
    max-width: 900px; margin: 0 auto; position: relative; z-index: 5;
}
.hero-title {
    font-size: 4rem; line-height: 1.1; margin-bottom: 1.5rem;
    background: linear-gradient(90deg, var(--electric-cyan), var(--plasma-violet));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    text-shadow: 0 0 40px rgba(124, 58, 237, 0.2);
    font-weight: 900; letter-spacing: -1px;
}
.hero-subtitle { font-size: 1.25rem; color: var(--text-secondary); margin-bottom: 3rem; }
.hero-actions { display: flex; gap: 1.5rem; justify-content: center; }

/* Interactive Turbine Widget */
.turbine-widget {
    background: var(--card-bg); border: 1px solid var(--card-border);
    border-radius: 12px; padding: 2rem; margin: 0 auto 3rem;
    max-width: 500px; display: flex; flex-direction: column; align-items: center; gap: 2rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.turbine-display { position: relative; width: 120px; height: 120px; }
.turbine-glow {
    position: absolute; top: -20%; left: -20%; width: 140%; height: 140%;
    background: radial-gradient(circle, var(--electric-cyan) 0%, transparent 70%);
    opacity: calc(var(--throttle-percent) / 100 * 0.8);
    transition: opacity 0.2s; filter: blur(15px); mix-blend-mode: screen;
}
.turbine-blade {
    width: 100%; height: 100%;
    color: var(--electric-cyan);
    animation: spin var(--turbine-speed) linear infinite;
    transform-origin: center;
    filter: drop-shadow(0 0 10px var(--electric-cyan));
}
.throttle-controls { width: 100%; text-align: left; }
.throttle-controls label { display: block; margin-bottom: 1rem; font-weight: bold; font-size: 1.1rem; }
.throttle-controls input[type="range"] {
    width: 100%; appearance: none; background: transparent; cursor: pointer;
}
.throttle-controls input[type="range"]::-webkit-slider-runnable-track {
    height: 8px; background: var(--card-border); border-radius: 4px;
}
.throttle-controls input[type="range"]::-webkit-slider-thumb {
    appearance: none; height: 24px; width: 24px; border-radius: 50%;
    background: var(--electric-cyan); margin-top: -8px;
    box-shadow: 0 0 15px var(--electric-cyan);
}

/* Sections */
.section { padding: 6rem 2rem; max-width: 1400px; margin: 0 auto; position: relative; z-index: 2;}
.bg-panel { background: linear-gradient(180deg, transparent, var(--bg-panel), transparent); max-width: 100%; }
.section-title {
    text-align: center; font-size: 2.2rem; margin-bottom: 4rem;
    color: var(--text-primary); text-transform: uppercase; font-weight: 800;
}

/* Cards */
.plasma-card, .card, .hero {
    background: var(--card-bg); border: 1px solid var(--card-border);
    border-radius: 12px; padding: 2.5rem;
    backdrop-filter: blur(10px); transition: transform 0.3s, box-shadow 0.3s;
    position: relative; overflow: hidden;
}
.plasma-card:hover, .card:hover { transform: translateY(-5px); box-shadow: 0 10px 30px rgba(124,58,237,0.15); }

/* Animated glowing outline on hover */
.plasma-card::before, .card::before {
    content: ''; position: absolute; top: 0; left: -100%; width: 50%; height: 2px;
    background: linear-gradient(90deg, transparent, var(--electric-cyan), transparent);
    transition: left 0.5s;
}
.plasma-card:hover::before, .card:hover::before { left: 100%; }

.card-icon { font-size: 2.5rem; margin-bottom: 1.5rem; }
.card-icon-lg { font-size: 4rem; margin-right: 2rem; }
.plasma-card h3 { font-size: 1.4rem; margin-bottom: 1rem; color: var(--text-primary); }
.plasma-card p, .card p { color: var(--text-secondary); font-size: 1.05rem; }
.horizontal { display: flex; align-items: center; }

/* Grids */
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 2rem; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 2.5rem; }
.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(500px, 1fr)); gap: 3rem; }

/* Pricing Deck (Neon Borders) */
.pricing-card-wrapper {
    position: relative; padding: 3px; border-radius: 16px; overflow: hidden;
    background: var(--card-border); transition: transform 0.3s;
}
.pricing-card-wrapper:hover { transform: translateY(-10px); }
.pricing-card-wrapper.glowing-border::before {
    content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
    background: conic-gradient(from 0deg, transparent 70%, var(--electric-cyan) 80%, var(--plasma-violet) 100%);
    animation: spin 3s linear infinite; z-index: 0;
}
.pricing-card { background: var(--card-bg); border-radius: 14px; height: 100%; padding: 3rem 2rem; position: relative; z-index: 1; text-align: center;}
.pricing-content h3 { font-size: 1.5rem; margin-bottom: 1rem; }
.pricing-content .price { font-size: 3.5rem; font-weight: 900; margin: 1.5rem 0; color: var(--text-primary); }
.pricing-content .price span { font-size: 1.2rem; color: var(--text-secondary); font-weight: normal; }
.pricing-features { list-style: none; margin: 2rem 0; text-align: left; }
.pricing-features li { padding: 0.8rem 0; border-bottom: 1px solid rgba(255,255,255,0.05); color: var(--text-primary); }
.pricing-features li::before { content: '⇈'; color: var(--plasma-violet); margin-right: 0.8rem; font-weight: bold; }
.badge {
    position: absolute; top: 0; left: 50%; transform: translateX(-50%);
    background: var(--plasma-violet); color: #fff; padding: 4px 16px;
    border-bottom-left-radius: 8px; border-bottom-right-radius: 8px;
    font-size: 0.85rem; font-weight: bold; z-index: 10; text-transform: uppercase;
}

/* Utils */
.text-cyan { color: var(--electric-cyan); }
.text-violet { color: var(--plasma-violet); }
.text-center { text-align: center; }

/* Reviews */
.review-text { font-style: italic; margin-bottom: 1.5rem; }
.reviewer { font-weight: bold; }

/* Theme toggle */
.theme-toggle-btn {
    background: transparent; border: none; color: var(--text-primary); cursor: pointer;
    display: flex; align-items: center; justify-content: center; width: 40px; height: 40px;
    border-radius: 50%; transition: 0.2s;
}
.theme-toggle-btn:hover { background: rgba(124, 58, 237, 0.1); }
.theme-toggle-btn svg { width: 22px; height: 22px; }
[data-theme="dark"] .icon-moon { display: none; }
:root:not([data-theme="dark"]) .icon-sun { display: none; }

/* Footer */
footer { padding: 3rem 2rem; border-top: 1px solid var(--card-border); text-align: center; background: var(--bg-panel); position:relative; z-index:2;}
.footer-links { display: flex; justify-content: center; gap: 2.5rem; margin-bottom: 1.5rem; flex-wrap: wrap; }
.footer-links a { color: var(--text-secondary); font-size: 1rem; text-transform: uppercase; transition: color 0.2s;}
.footer-links a:hover { color: var(--electric-cyan); }

/* Animations */
@keyframes spin { 100% { transform: rotate(360deg); } }

/* Responsive */
@media (max-width: 1024px) {
    .nav-links { display: none; }
    .hero-title { font-size: 3rem; }
    .grid-4 { grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); }
}
@media (max-width: 768px) {
    .hero-plasma { padding-top: 8rem; }
    .hero-title { font-size: 2.5rem; }
    .hero-actions { flex-direction: column; }
    .horizontal { flex-direction: column; text-align: center; }
    .card-icon-lg { margin-right: 0; margin-bottom: 1rem; }
}