/* ===== CSS Variables ===== */
:root {
    /* Colors */
    --primary: #8B5CF6;
    --primary-dark: #7C3AED;
    --primary-light: #A78BFA;
    --secondary: #10B981;
    --secondary-dark: #059669;
    --accent-gold: #F59E0B;
    --accent-indigo: #6366F1;
    --accent-red: #EF4444;
    
    /* Neutrals */
    --dark: #1E1B29;
    --light: #FAFAF9;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Typography */
    --font-display: 'Rajdhani', sans-serif;
    --font-body: 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Layout */
    --max-width: 1200px;
    --nav-height: 80px;
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

/* ===== Reset & Base Styles ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-body);
    font-weight: 400;
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background-color: var(--light);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ===== Layout Structure ===== */
main {
    flex: 1 0 auto;
}

footer {
    flex-shrink: 0;
}

/* ===== Typography System ===== */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 2.5rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

h5 {
    font-size: 1.25rem;
    font-weight: 600;
}

h6 {
    font-size: 1.125rem;
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-sm);
}

p:last-child {
    margin-bottom: 0;
}

/* ===== Links ===== */
a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

a:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ===== Lists ===== */
ul, ol {
    list-style: none;
}

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

/* ===== Buttons ===== */
button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* ===== Forms ===== */
input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

/* Focus Styles */
input:focus,
textarea:focus,
select:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ===== Tables ===== */
table {
    width: 100%;
    border-collapse: collapse;
}

th {
    text-align: left;
    font-weight: 600;
}

/* ===== Code ===== */
code {
    font-family: 'Monaco', 'Courier New', monospace;
    background: var(--gray-100);
    padding: 0.125rem 0.25rem;
    border-radius: 0.25rem;
    font-size: 0.875em;
}

pre {
    background: var(--gray-100);
    padding: var(--spacing-md);
    border-radius: 0.5rem;
    overflow-x: auto;
}

pre code {
    background: none;
    padding: 0;
}

/* ===== Utility Classes ===== */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section {
    padding: var(--spacing-3xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    color: var(--primary);
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    font-weight: 700;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--gray-500);
    max-width: 800px;
    margin: 0 auto;
}

.subsection {
    margin-bottom: var(--spacing-2xl);
}

.subsection:last-child {
    margin-bottom: 0;
}

/* Text Alignment */
.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

/* Display Utilities */
.hidden {
    display: none;
}

.block {
    display: block;
}

.inline-block {
    display: inline-block;
}

.flex {
    display: flex;
}

.grid {
    display: grid;
}

/* Spacing Utilities */
.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

.pt-0 { padding-top: 0; }
.pt-1 { padding-top: var(--spacing-xs); }
.pt-2 { padding-top: var(--spacing-sm); }
.pt-3 { padding-top: var(--spacing-md); }
.pt-4 { padding-top: var(--spacing-lg); }
.pt-5 { padding-top: var(--spacing-xl); }

.pb-0 { padding-bottom: 0; }
.pb-1 { padding-bottom: var(--spacing-xs); }
.pb-2 { padding-bottom: var(--spacing-sm); }
.pb-3 { padding-bottom: var(--spacing-md); }
.pb-4 { padding-bottom: var(--spacing-lg); }
.pb-5 { padding-bottom: var(--spacing-xl); }

/* Skip Link */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--primary);
    color: white;
    padding: var(--spacing-sm);
    z-index: 100;
    text-decoration: none;
}

.skip-link:focus {
    top: 0;
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* ===== Animations ===== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.animate-in {
    animation: fadeIn var(--transition-slow) ease-out forwards;
}

.fade-in-up {
    animation: fadeInUp var(--transition-slow) ease-out forwards;
}

/* ===== Loading States ===== */
.loading {
    position: relative;
    color: transparent;
}

.loading::after {
    content: "";
    position: absolute;
    width: 16px;
    height: 16px;
    top: 50%;
    left: 50%;
    margin-left: -8px;
    margin-top: -8px;
    border: 2px solid var(--gray-300);
    border-radius: 50%;
    border-top-color: var(--primary);
    animation: spinner 0.6s linear infinite;
}

@keyframes spinner {
    to {
        transform: rotate(360deg);
    }
}

/* ===== Responsive Typography ===== */
@media (max-width: 768px) {
    body {
        font-size: 15px;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .section-subtitle {
        font-size: 1.125rem;
    }
}

/* ===== Dark Mode Support (Optional) ===== */
@media (prefers-color-scheme: dark) {
    :root {
        --light: #1E1B29;
        --dark: #FAFAF9;
    }
    
    body {
        background-color: var(--gray-900);
        color: var(--gray-100);
    }
    
    a {
        color: var(--primary-light);
    }
    
    a:hover {
        color: var(--primary);
    }
}

/* ===== Print Styles ===== */
@media print {
    body {
        font-size: 12pt;
        color: black;
        background: white;
    }
    
    .navbar, 
    .footer, 
    .cta-section, 
    video,
    .skip-link,
    button {
        display: none;
    }
    
    a {
        color: black;
        text-decoration: underline;
    }
    
    h1, h2, h3, h4, h5, h6 {
        page-break-after: avoid;
    }
    
    img {
        page-break-inside: avoid;
    }
}

/* ===== Custom Scrollbar (Webkit) ===== */
::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

::-webkit-scrollbar-track {
    background: var(--gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--gray-400);
    border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gray-500);
}

/* ===== Selection Styles ===== */
::selection {
    background: var(--primary);
    color: white;
}

::-moz-selection {
    background: var(--primary);
    color: white;
}