/* =========================================
   Delta Executor Premium Design System
   ========================================= */

:root {
    --bg-main: #060913;
    --bg-secondary: #0f152b;
    --text-main: #f0f4f8;
    --text-muted: #94a3b8;
    --accent-primary: #7c3aed; /* Vibrant Purple */
    --accent-secondary: #2563eb; /* Royal Blue */
    --accent-gradient: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    
    --glass-bg: rgba(15, 21, 43, 0.4);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.37);
    
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    --transition-smooth: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body.theme-dark {
    background-color: var(--bg-main);
    color: var(--text-main);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    line-height: 1.2;
    margin-bottom: 1rem;
}

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

a:hover {
    color: var(--accent-secondary);
}

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

.accent {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

/* ================== Header ================== */
.site-header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(6, 9, 19, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition-smooth);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.brand-logo {
    font-size: 1.8rem;
    font-family: var(--font-heading);
    font-weight: 800;
    color: var(--text-main);
}

.main-nav ul {
    list-style: none;
    display: flex;
    gap: 30px;
}

.main-nav a {
    color: var(--text-main);
    font-weight: 600;
    font-size: 1rem;
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-gradient);
    transition: width 0.3s ease;
}

.main-nav a:hover::after {
    width: 100%;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-main);
    cursor: pointer;
}

/* ================== Buttons ================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 50px;
    font-weight: 600;
    font-family: var(--font-heading);
    font-size: 1.1rem;
    cursor: pointer;
    transition: var(--transition-smooth);
    border: none;
}

.btn-primary {
    background: var(--accent-gradient);
    color: #fff;
    box-shadow: 0 10px 20px -10px var(--accent-primary);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 15px 25px -10px var(--accent-primary);
    color: #fff;
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-main);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(4px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
}

/* ================== Hero Section ================== */
.hero {
    padding: 180px 0 100px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -20%;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(124,58,237,0.15) 0%, rgba(0,0,0,0) 70%);
    z-index: -1;
}

.hero-title {
    font-size: 4.5rem;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 600px;
    margin: 0 auto 40px;
}

.hero-actions {
    display: flex;
    gap: 20px;
    justify-content: center;
}

/* ================== Glassmorphism Cards ================== */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 40px;
    box-shadow: var(--glass-shadow);
    transition: var(--transition-smooth);
}

.glass-card:hover {
    transform: translateY(-10px);
    border-color: rgba(255, 255, 255, 0.15);
    background: rgba(15, 21, 43, 0.6);
}

/* ================== General Content ================== */
.section-padding {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 50px;
}

.content-block {
    max-width: 800px;
    margin: 0 auto;
    font-size: 1.1rem;
    color: var(--text-muted);
}

.content-block h2, .content-block h3 {
    color: var(--text-main);
    margin-top: 40px;
}

.content-block p {
    margin-bottom: 20px;
}

.content-block ul {
    margin-bottom: 20px;
    padding-left: 20px;
}

.content-block li {
    margin-bottom: 10px;
}

/* ================== Footer ================== */
.site-footer {
    background: #030408;
    border-top: 1px solid var(--glass-border);
    padding: 80px 0 20px;
    margin-top: 80px;
}

.footer-inner {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 60px;
    margin-bottom: 60px;
}

.footer-col h3 {
    font-size: 1.2rem;
    margin-bottom: 20px;
}

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

.footer-col li {
    margin-bottom: 12px;
}

.footer-col a {
    color: var(--text-muted);
}

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

.footer-bottom {
    border-top: 1px solid var(--glass-border);
    padding-top: 20px;
    text-align: center;
    color: var(--text-muted);
}

/* ================== Responsive ================== */
@media (max-width: 768px) {
    .header-inner {
        height: 70px;
    }
    
    .main-nav {
        display: none; /* simple toggle later */
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: var(--bg-main);
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--glass-border);
    }
    
    .main-nav.active {
        display: flex;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 15px;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    .hero {
        padding: 140px 0 60px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .footer-inner {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}