/* Sierra EduTech Solutions Limited - Modern Dark Theme */
/* Expert UI/UX Design with Consistent Styling */

:root {
    /* Dark Theme Colors */
    --bg-primary: #000000;
    --bg-secondary: #0a0a0a;
    --bg-card: #111111;
    --bg-card-hover: #1a1a1a;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #e5e5e5;
    --text-muted: #a0a0a0;
    
    /* Gradient Colors */
    --gradient-start: #8b5cf6; /* Purple */
    --gradient-end: #3b82f6; /* Blue */
    --gradient-accent: #06b6d4; /* Cyan */
    
    /* Accent Colors */
    --accent-purple: #8b5cf6;
    --accent-blue: #3b82f6;
    --accent-cyan: #06b6d4;
    
    /* Border */
    --border-color: #1f1f1f;
    --border-light: #2a2a2a;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Base Styles */
body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Gradient Text */
.gradient-text {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.gradient-text-cyan {
    background: linear-gradient(135deg, var(--gradient-end) 0%, var(--gradient-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

/* Gradient Border */
.gradient-border {
    position: relative;
    background: var(--bg-card);
    border-radius: 1rem;
    padding: 1px;
}

.gradient-border::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 1rem;
    padding: 1px;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
}

/* Cards */
.modern-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    transition: all var(--transition-base);
    overflow: visible;
    word-wrap: break-word;
    overflow-wrap: break-word;
}

.modern-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-light);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(139, 92, 246, 0.1);
}

/* Buttons */
.btn-modern-primary {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-modern-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(139, 92, 246, 0.3);
    color: white;
}

.btn-modern-secondary {
    background: transparent;
    color: var(--text-primary);
    padding: 0.75rem 2rem;
    border-radius: 0.5rem;
    font-weight: 600;
    transition: all var(--transition-base);
    border: 1px solid var(--border-light);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
}

.btn-modern-secondary:hover {
    background: var(--bg-card);
    border-color: var(--gradient-end);
    color: var(--text-primary);
}

/* Navigation */
.nav-dark {
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

.nav-link-dark {
    color: var(--text-secondary);
    transition: color var(--transition-base);
    text-decoration: none;
}

.nav-link-dark:hover {
    color: var(--text-primary);
}

/* Statistics Cards */
.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2rem;
    text-align: center;
    transition: all var(--transition-base);
}

.stat-card:hover {
    border-color: var(--gradient-end);
    transform: translateY(-4px);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

/* Service Cards */
.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 2rem;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
    transform: scaleX(0);
    transition: transform var(--transition-base);
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card:hover {
    border-color: var(--border-light);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(139, 92, 246, 0.15);
}

/* Founder Card */
.founder-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 2rem;
    display: flex;
    gap: 2rem;
    align-items: center;
    transition: all var(--transition-base);
}

.founder-card:hover {
    border-color: var(--border-light);
    box-shadow: 0 20px 40px rgba(139, 92, 246, 0.1);
}

.founder-badge {
    background: linear-gradient(135deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 600;
    display: inline-block;
    margin-bottom: 1rem;
}

/* Team Cards */
.team-card-dark {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 1.5rem;
    padding: 2rem;
    text-align: center;
    transition: all var(--transition-base);
}

.team-card-dark:hover {
    border-color: var(--gradient-end);
    transform: translateY(-4px);
    box-shadow: 0 20px 40px rgba(139, 92, 246, 0.15);
}

.team-photo {
    width: 200px;
    height: 200px;
    border-radius: 1rem;
    object-fit: cover;
    margin: 0 auto 1.5rem;
    border: 2px solid var(--border-color);
    transition: all var(--transition-base);
}

.team-card-dark:hover .team-photo {
    border-color: var(--gradient-end);
}

/* Hero Section */
.hero-dark {
    background: var(--bg-primary);
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero-dark::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
    pointer-events: none;
}

/* Section Headings */
.section-heading {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
    font-family: 'Poppins', sans-serif;
}

.section-subheading {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 3rem;
    line-height: 1.6;
}

/* Grid Pattern Background */
.grid-pattern {
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
    background-size: 50px 50px;
}

/* Responsive Typography */
@media (max-width: 768px) {
    .section-heading {
        font-size: 2rem;
    }
    
    .stat-number {
        font-size: 2rem;
    }
    
    .founder-card {
        flex-direction: column;
        text-align: center;
    }
    
    .founder-card img,
    .founder-card > div:first-child > div {
        margin: 0 auto 2rem;
    }
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, var(--gradient-end), var(--gradient-accent));
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Focus States for Accessibility */
*:focus-visible {
    outline: 2px solid var(--gradient-end);
    outline-offset: 2px;
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Link Styles */
a {
    transition: color var(--transition-fast);
}

/* Image Optimization */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* Logo Styles */
.logo {
    transition: transform var(--transition-base);
}

.logo:hover {
    transform: scale(1.05);
}