/* ============================================
   TOS Network - Premium Design Enhancements
   Enterprise-Grade Visual Refinements
   ============================================ */

/* ============================================
   Enhanced Typography System
   Premium font hierarchy with dramatic scale
   ============================================ */

:root {
    /* Premium Color Palette */
    --premium-black: #0B0D17;
    --premium-darker: #14161F;
    --premium-dark: #1A1D2E;
    --premium-card: #1F2233;
    --premium-card-hover: #252938;

    /* Metallic Accents */
    --platinum-blue: #E8EDF4;
    --silver-blue: #C5D3E8;
    --steel-blue: #8FA3BF;
    --accent-gold: #FFD89C;
    --accent-cyan: #7DD3FC;

    /* Premium Gradients */
    --gradient-premium: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    --gradient-glass: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);

    /* Premium Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 8px -2px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px -4px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px -8px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 16px 64px -16px rgba(0, 0, 0, 0.7);
    --shadow-glow: 0 0 40px rgba(102, 126, 234, 0.15);

    /* Premium Typography */
    --font-display: 'Inter', -apple-system, system-ui, sans-serif;
    --font-weight-light: 300;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-black: 900;

    /* Letter Spacing for Premium Feel */
    --tracking-tight: -0.02em;
    --tracking-normal: 0;
    --tracking-wide: 0.025em;
    --tracking-wider: 0.05em;

    /* Premium Transitions */
    --ease-premium: cubic-bezier(0.23, 1, 0.32, 1);
    --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Premium Body & Background
   ============================================ */

body {
    background: var(--premium-black);
    font-weight: var(--font-weight-normal);
    letter-spacing: var(--tracking-normal);
}

/* Subtle grain texture overlay */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.03;
    z-index: 1;
    pointer-events: none;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* ============================================
   Premium Hero Section
   ============================================ */

.hero {
    position: relative;
    background: linear-gradient(180deg, var(--premium-black) 0%, var(--premium-darker) 100%);
}

.hero-title {
    font-size: 4.5rem;
    font-weight: var(--font-weight-black);
    letter-spacing: var(--tracking-tight);
    line-height: 1.1;
    background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 80px rgba(102, 126, 234, 0.3);
}

.hero-title .highlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 50%, #f093fb 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-weight: var(--font-weight-black);
    position: relative;
    display: inline-block;
}

.hero-subtitle {
    font-size: 1.25rem;
    font-weight: var(--font-weight-normal);
    color: var(--silver-blue);
    letter-spacing: var(--tracking-wide);
    line-height: 1.8;
    max-width: 680px;
}

/* ============================================
   Premium Button System
   ============================================ */

.btn {
    position: relative;
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--tracking-wide);
    transition: all 0.4s var(--ease-premium);
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    opacity: 0;
    transition: opacity 0.4s var(--ease-premium);
}

.btn:hover::before {
    opacity: 1;
}

.btn-primary {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    box-shadow: 0 8px 24px -4px rgba(102, 126, 234, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-primary:hover {
    box-shadow: 0 12px 40px -4px rgba(102, 126, 234, 0.6);
    transform: translateY(-2px);
}

.btn-secondary {
    background: rgba(102, 126, 234, 0.1);
    border: 1px solid rgba(102, 126, 234, 0.3);
    backdrop-filter: blur(20px);
}

.btn-secondary:hover {
    background: rgba(102, 126, 234, 0.15);
    border-color: rgba(102, 126, 234, 0.5);
    box-shadow: 0 8px 24px -4px rgba(102, 126, 234, 0.3);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(20px);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.4);
    box-shadow: 0 8px 24px -4px rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

/* ============================================
   Premium Card System
   ============================================ */

.feature-card {
    background: var(--premium-card);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 16px;
    padding: 2rem;
    position: relative;
    overflow: hidden;
    transition: all 0.5s var(--ease-premium);
    box-shadow: var(--shadow-sm);
}

/* Glass morphism effect */
.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.1) 50%, transparent 100%);
    opacity: 0;
    transition: opacity 0.5s var(--ease-premium);
}

.feature-card:hover {
    background: var(--premium-card-hover);
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
    transform: translateY(-8px);
}

.feature-card:hover::before {
    opacity: 1;
}

/* Premium hover glow effect */
.feature-card::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(102, 126, 234, 0.1) 0%, transparent 70%);
    transform: translate(-50%, -50%) scale(0);
    transition: transform 0.6s var(--ease-premium);
    pointer-events: none;
}

.feature-card:hover::after {
    transform: translate(-50%, -50%) scale(1);
}

.card-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.1) 0%, rgba(118, 75, 162, 0.1) 100%);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.5s var(--ease-bounce);
    box-shadow: var(--shadow-xs);
}

.feature-card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-md);
}

.card-title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: var(--tracking-tight);
    color: var(--platinum-blue);
    margin-bottom: 0.75rem;
}

.card-description {
    font-size: 1rem;
    font-weight: var(--font-weight-normal);
    color: var(--steel-blue);
    letter-spacing: var(--tracking-wide);
    line-height: 1.7;
}

/* ============================================
   Premium Section Headers
   ============================================ */

.section-title {
    font-size: 3rem;
    font-weight: var(--font-weight-black);
    letter-spacing: var(--tracking-tight);
    background: linear-gradient(135deg, #ffffff 0%, #e0e7ff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.125rem;
    font-weight: var(--font-weight-normal);
    color: var(--silver-blue);
    letter-spacing: var(--tracking-wide);
    line-height: 1.8;
    max-width: 720px;
    margin: 0 auto;
}

/* ============================================
   Premium Navigation
   ============================================ */

.navbar {
    background: rgba(11, 13, 23, 0.8);
    backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 4px 24px -4px rgba(0, 0, 0, 0.5);
}

.navbar-link {
    font-weight: var(--font-weight-medium);
    letter-spacing: var(--tracking-wide);
    transition: all 0.3s var(--ease-premium);
}

.navbar-link:hover {
    color: var(--platinum-blue);
}

.dropdown-link {
    transition: all 0.3s var(--ease-premium);
}

.dropdown-link:hover {
    background: rgba(102, 126, 234, 0.1);
    transform: translateX(4px);
}

/* ============================================
   Premium Documentation & Whitepaper Cards
   ============================================ */

.docs-card,
.whitepaper-card {
    background: var(--premium-card);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--shadow-md);
    transition: all 0.5s var(--ease-premium);
    position: relative;
    overflow: hidden;
}

.docs-card::before,
.whitepaper-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent 0%, rgba(102, 126, 234, 0.5) 50%, transparent 100%);
    opacity: 0;
    transition: opacity 0.5s var(--ease-premium);
}

.docs-card:hover,
.whitepaper-card:hover {
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: var(--shadow-xl), var(--shadow-glow);
    transform: translateY(-4px);
}

.docs-card:hover::before,
.whitepaper-card:hover::before {
    opacity: 1;
}

.docs-title,
.whitepaper-title {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: var(--tracking-tight);
    color: var(--platinum-blue);
}

.docs-description,
.whitepaper-description {
    color: var(--steel-blue);
    letter-spacing: var(--tracking-wide);
    line-height: 1.8;
}

/* ============================================
   Premium FAQ Section
   ============================================ */

.faq-item {
    background: var(--premium-card);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.4s var(--ease-premium);
    box-shadow: var(--shadow-sm);
}

.faq-item:hover {
    border-color: rgba(102, 126, 234, 0.2);
    box-shadow: var(--shadow-md);
}

.faq-item.active {
    border-color: rgba(102, 126, 234, 0.3);
    box-shadow: var(--shadow-lg);
}

.faq-question {
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--tracking-wide);
    color: var(--platinum-blue);
    transition: all 0.3s var(--ease-premium);
}

.faq-question:hover {
    color: #ffffff;
}

.faq-answer-content {
    color: var(--steel-blue);
    letter-spacing: var(--tracking-wide);
    line-height: 1.8;
}

/* ============================================
   Premium Footer
   ============================================ */

.footer {
    background: var(--premium-darker);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-heading {
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--tracking-wider);
    color: var(--platinum-blue);
    font-size: 0.875rem;
    text-transform: uppercase;
}

.footer-links a {
    color: var(--steel-blue);
    transition: all 0.3s var(--ease-premium);
    letter-spacing: var(--tracking-wide);
}

.footer-links a:hover {
    color: var(--platinum-blue);
    transform: translateX(4px);
}

/* ============================================
   Responsive Premium Adjustments
   ============================================ */

@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }

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

    .feature-card {
        padding: 1.5rem;
    }
}

/* ============================================
   Performance Optimizations
   ============================================ */

.feature-card,
.btn,
.navbar,
.docs-card,
.whitepaper-card,
.faq-item {
    will-change: transform;
}

/* Reduce motion for accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
    }
}