/**
 * Proset Bilişim - Critical CSS for Above-the-Fold Content
 * Inline CSS for immediate rendering and optimal Core Web Vitals
 */

/* Critical Design System Variables */
:root {
    --primary-gradient: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    --primary-hover: linear-gradient(135deg, #1d4ed8 0%, #6d28d9 100%);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.3);
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --border-radius-xl: 1.5rem;
    --border-radius-2xl: 2rem;
    --font-display: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* Critical Reset */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-body);
    line-height: 1.6;
    color: #1f2937;
    background: #ffffff;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Critical Navigation */
.navigation-modern {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.2);
    z-index: 1000;
    transition: all 300ms ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

/* Critical Hero Section */
.hero-modern {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}

.hero-modern::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(37, 99, 235, 0.2) 0%, transparent 50%);
    animation: heroGlow 8s ease-in-out infinite alternate;
}

@keyframes heroGlow {
    0% { opacity: 0.5; transform: scale(1); }
    100% { opacity: 0.8; transform: scale(1.1); }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 800px;
    padding: var(--space-2xl);
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    color: white;
    margin-bottom: var(--space-lg);
    line-height: 1.1;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.hero-subtitle {
    font-size: clamp(1.1rem, 2vw, 1.25rem);
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: var(--space-2xl);
    line-height: 1.6;
    font-weight: 400;
}

/* Critical Button Styles */
.btn-modern {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md) var(--space-xl);
    border: none;
    border-radius: var(--border-radius-xl);
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    transition: all 300ms cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
    backdrop-filter: blur(10px);
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1), var(--shadow-glow);
}

.btn-primary:hover {
    background: var(--primary-hover);
    transform: translateY(-2px) scale(1.02);
    box-shadow: 0 20px 25px rgba(0, 0, 0, 0.1), 0 0 30px rgba(37, 99, 235, 0.4);
}

/* Critical Layout */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* Critical Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.025em;
    color: #111827;
}

a {
    color: #2563eb;
    text-decoration: none;
    transition: color 150ms ease;
}

a:hover {
    color: #1d4ed8;
}

/* Critical Responsive */
@media (max-width: 768px) {
    .nav-container {
        padding: var(--space-md);
    }
    
    .hero-content {
        padding: var(--space-lg);
    }
    
    .btn-modern {
        padding: var(--space-md) var(--space-lg);
        font-size: 0.9rem;
    }
}

/* Critical Loading States */
.loading {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.loaded {
    opacity: 1;
    transform: translateY(0);
}

/* Critical Font Loading - Using Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@100..900&display=swap');

/* Critical Performance Optimizations */
img {
    max-width: 100%;
    height: auto;
}

/* Critical Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .hero-modern::before {
        animation: none;
    }
}

/* Critical Focus States */
.btn-modern:focus,
.nav-logo:focus {
    outline: 2px solid #2563eb;
    outline-offset: 2px;
}

/* Critical Print Styles */
@media print {
    .navigation-modern,
    .btn-modern {
        display: none !important;
    }
    
    body {
        background: white !important;
        color: black !important;
    }
}