/* ==========================================
   CSS CUSTOM PROPERTIES (THEMING)
   ========================================== */
:root {
    /* Microsoft Color Palette */
    --color-azure-blue: #0078d4;
    --color-purple: #5c2d91;
    --color-orange: #d83b01;
    --color-red: #e81123;
    --color-green: #107c10;
    --color-gray: #323130;
    --color-gray-light: #605e5c;
    --color-gray-lighter: #edebe9;
    --color-gray-lightest: #f3f2f1;
    --color-white: #ffffff;
    --color-black: #000000;

    /* Typography */
    --font-primary: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Roboto', 'Helvetica Neue', sans-serif;
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-h1: 48px;
    --font-size-h2: 36px;
    --font-size-h3: 24px;
    --font-size-h4: 20px;
    --line-height-base: 1.6;
    --line-height-heading: 1.2;

    /* Spacing */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 64px;

    /* Shadows (Fluent Design) */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.14);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.16);
    --shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.18);

    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;

    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 250ms ease-in-out;
    --transition-slow: 350ms ease-in-out;

    /* Layout */
    --container-max-width: 1200px;
    --container-padding: 20px;
}

/* ==========================================
   RESET & BASE STYLES
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: var(--font-size-base);
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    line-height: var(--line-height-base);
    color: var(--color-gray);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img {
    max-width: 100%;
    height: auto;
}

a {
    color: var(--color-azure-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-purple);
}

a:focus {
    outline: 2px solid var(--color-azure-blue);
    outline-offset: 2px;
}

/* ==========================================
   LAYOUT UTILITIES
   ========================================== */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* ==========================================
   EVENT RIBBON
   ========================================== */
.event-ribbon {
    background: linear-gradient(135deg, var(--color-azure-blue), var(--color-purple));
    color: var(--color-white);
    padding: var(--spacing-sm) 0;
    text-align: center;
    font-size: var(--font-size-small);
    font-weight: 600;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.live-indicator {
    color: #ff4136;
    font-size: 12px;
    margin-right: var(--spacing-xs);
    animation: pulse 2s infinite;
}

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

/* ==========================================
   HERO SECTION
   ========================================== */
.hero {
    position: relative;
    background: linear-gradient(135deg, #0078d4 0%, #5c2d91 50%, #0078d4 100%);
    padding: var(--spacing-xxl) 0;
    text-align: center;
    overflow: hidden;
}

.hero-banner {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    /* CSS Custom Properties for dynamic gradient (updated by JavaScript) */
    --mouse-x: 50%;
    --mouse-y: 50%;
    --layer1-x: 40%;
    --layer1-y: 50%;
    --layer2-x: 70%;
    --layer2-y: 70%;
    --layer3-x: 30%;
    --layer3-y: 30%;
    background:
        /* Mouse-following spotlight with stronger glow */
        radial-gradient(circle 800px at var(--mouse-x) var(--mouse-y), rgba(255, 255, 255, 0.15) 0%, transparent 60%),
        /* Parallax layer 1 - slow movement */
        radial-gradient(circle 600px at var(--layer1-x) var(--layer1-y), rgba(255, 255, 255, 0.08) 0%, transparent 50%),
        /* Parallax layer 2 - medium movement */
        radial-gradient(circle 500px at var(--layer2-x) var(--layer2-y), rgba(92, 45, 145, 0.25) 0%, transparent 50%),
        /* Parallax layer 3 - fast movement */
        radial-gradient(circle 400px at var(--layer3-x) var(--layer3-y), rgba(0, 120, 212, 0.2) 0%, transparent 50%),
        /* Base gradient */
        linear-gradient(135deg, #0078d4 0%, #5c2d91 50%, #0c62a4 100%);
    opacity: 1;
    z-index: 0;
    /* Smooth transitions for non-JavaScript updates */
    transition: background 0.3s ease;
}

.hero-banner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image:
        repeating-linear-gradient(45deg, transparent, transparent 35px, rgba(255, 255, 255, 0.03) 35px, rgba(255, 255, 255, 0.03) 70px);
    animation: slide 20s linear infinite;
}

@keyframes slide {
    0% { transform: translateX(0); }
    100% { transform: translateX(70px); }
}

.hero .container {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: var(--font-size-h1);
    font-weight: 700;
    line-height: var(--line-height-heading);
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    max-width: 900px;
    margin-left: auto;
    margin-right: auto;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: var(--font-size-large);
    color: rgba(255, 255, 255, 0.95);
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xl);
    flex-wrap: wrap;
    margin-top: var(--spacing-xl);
}

.stat {
    text-align: center;
    min-width: 150px;
}

.stat-number {
    font-size: 48px;
    font-weight: 700;
    color: var(--color-white);
    line-height: 1;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.stat-label {
    font-size: var(--font-size-small);
    color: rgba(255, 255, 255, 0.9);
    margin-top: var(--spacing-xs);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* ==========================================
   WHAT YOU'LL LEARN SECTION
   ========================================== */
.what-you-learn {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-white);
    text-align: center;
}

.what-you-learn .section-title {
    margin-bottom: var(--spacing-sm);
}

.what-you-learn .section-subtitle {
    max-width: 800px;
    margin: 0 auto;
    font-size: var(--font-size-large);
    line-height: 1.7;
}

/* ==========================================
   CHALLENGES SECTION
   ========================================== */
.challenges {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-gray-lightest);
}

.section-title {
    font-size: var(--font-size-h2);
    font-weight: 700;
    color: var(--color-gray);
    text-align: center;
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: var(--font-size-large);
    color: var(--color-gray-light);
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-xl);
}

.challenges-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.challenge-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-lighter);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08), 0 2px 4px rgba(0, 0, 0, 0.06);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.challenge-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: linear-gradient(90deg, var(--card-accent-color, var(--color-azure-blue)), var(--card-accent-color, var(--color-azure-blue)) 70%, transparent);
    opacity: 1;
    transition: all var(--transition-base);
}

.challenge-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.15), 0 8px 16px rgba(0, 0, 0, 0.1);
}

.challenge-card:hover::before {
    height: 6px;
}

.challenge-card:focus-within {
    outline: 2px solid var(--color-azure-blue);
    outline-offset: 2px;
}

/* Challenge Card Color Accents */
.ai-card { --card-accent-color: var(--color-purple); }
.data-card { --card-accent-color: var(--color-orange); }
.infra-card { --card-accent-color: var(--color-azure-blue); }
.github-card { --card-accent-color: var(--color-gray); }
.security-card { --card-accent-color: var(--color-red); }
.fullstack-card { --card-accent-color: var(--color-green); }

.challenge-icon {
    font-size: 56px;
    margin-bottom: var(--spacing-md);
    text-align: center;
    display: block;
}

.challenge-title {
    font-size: var(--font-size-h3);
    font-weight: 600;
    color: var(--color-gray);
    margin-bottom: var(--spacing-xs);
}

.challenge-subtitle {
    font-size: var(--font-size-small);
    font-weight: 600;
    color: var(--card-accent-color, var(--color-azure-blue));
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.challenge-description {
    color: var(--color-gray-light);
    margin-bottom: var(--spacing-md);
    line-height: 1.7;
    font-size: 15px;
    font-weight: 400;
    letter-spacing: 0.2px;
}

.challenge-features {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.challenge-features li {
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    position: relative;
    color: var(--color-gray);
    font-size: var(--font-size-small);
}

.challenge-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--card-accent-color, var(--color-azure-blue));
    font-weight: 700;
}

.challenge-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    margin-top: auto;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-gray-lighter);
    font-size: var(--font-size-small);
}

.time-estimate {
    color: var(--color-gray-light);
}

.difficulty {
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.difficulty.beginner {
    background-color: #e8f5e9;
    color: var(--color-green);
}

.difficulty.intermediate {
    background-color: #fff3e0;
    color: var(--color-orange);
}

.difficulty.advanced {
    background-color: #fce4ec;
    color: var(--color-red);
}

/* ==========================================
   BUTTONS
   ========================================== */
.btn {
    display: inline-block;
    padding: 12px 24px;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-align: center;
    border-radius: var(--border-radius-sm);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:focus {
    outline: 2px solid var(--color-azure-blue);
    outline-offset: 2px;
}

.btn-primary {
    background-color: var(--color-azure-blue);
    color: var(--color-white);
}

.btn-primary:hover {
    background-color: var(--color-purple);
    color: var(--color-white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-azure-blue);
    border: 2px solid var(--color-azure-blue);
}

.btn-secondary:hover {
    background-color: var(--color-azure-blue);
    color: var(--color-white);
}

.btn-large {
    padding: 16px 32px;
    font-size: var(--font-size-large);
}

.challenge-cta {
    width: 100%;
    margin-top: var(--spacing-sm);
}

/* ==========================================
   CERTIFICATION VOUCHERS SECTION
   ========================================== */
.vouchers {
    background: linear-gradient(135deg, var(--color-purple), var(--color-azure-blue));
    color: var(--color-white);
    padding: var(--spacing-xxl) 0;
    text-align: center;
}

.vouchers .section-title,
.vouchers .section-subtitle {
    color: var(--color-white);
}

.vouchers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xl) 0;
}

.voucher-card {
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.voucher-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

.voucher-card.featured {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(255, 215, 0, 0.1));
    border: 2px solid rgba(255, 215, 0, 0.6);
}

.voucher-icon {
    font-size: 56px;
    margin-bottom: var(--spacing-md);
}

.voucher-title {
    font-size: var(--font-size-h3);
    font-weight: 700;
    color: var(--color-gray);
    margin-bottom: var(--spacing-sm);
}

.voucher-description {
    font-size: var(--font-size-base);
    color: var(--color-gray-light);
    line-height: 1.6;
}

.voucher-badge {
    display: inline-block;
    margin-top: var(--spacing-md);
    padding: 8px 16px;
    background: linear-gradient(135deg, var(--color-orange), var(--color-red));
    color: var(--color-white);
    font-size: var(--font-size-small);
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 20px;
}

.vouchers-note {
    font-size: var(--font-size-small);
    opacity: 0.9;
    font-style: italic;
    margin-top: var(--spacing-lg);
    color: var(--color-white);
}

/* ==========================================
   ANNOUNCEMENTS SECTION
   ========================================== */
.announcements {
    background: linear-gradient(135deg, #f5f5f5 0%, #ffffff 100%);
    padding: var(--spacing-xxl) 0;
}

.announcements-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.announcement-card {
    background: var(--color-white);
    border: 1px solid var(--color-gray-lighter);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-lg);
    position: relative;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.announcement-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.announcement-card.featured {
    border: 2px solid var(--color-azure-blue);
    box-shadow: 0 4px 12px rgba(0, 120, 212, 0.1);
}

.announcement-badge {
    position: absolute;
    top: 12px;
    right: 12px;
    background: var(--color-azure-blue);
    color: var(--color-white);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.announcement-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.announcement-title {
    font-size: var(--font-size-h3);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray);
    line-height: 1.3;
}

.announcement-description {
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-light);
    margin-bottom: var(--spacing-md);
}

.announcement-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-gray-lighter);
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.announcement-date {
    font-size: var(--font-size-small);
    color: var(--color-gray-light);
    font-weight: 500;
}

.announcement-link {
    color: var(--color-azure-blue);
    text-decoration: none;
    font-weight: 600;
    font-size: var(--font-size-small);
    transition: color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.announcement-link:hover {
    color: var(--color-purple);
}

/* ==========================================
   HOW IT WORKS SECTION
   ========================================== */
.how-it-works {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-gray-lightest);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.step {
    text-align: center;
    padding: var(--spacing-lg);
}

.step-number {
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-azure-blue), var(--color-purple));
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 700;
    margin: 0 auto var(--spacing-md);
}

.step-title {
    font-size: var(--font-size-h4);
    font-weight: 600;
    color: var(--color-gray);
    margin-bottom: var(--spacing-sm);
}

.step-description {
    color: var(--color-gray-light);
    line-height: 1.6;
}

/* ==========================================
   CTA SECTION
   ========================================== */
.cta-section {
    padding: var(--spacing-xxl) 0;
    background-color: var(--color-white);
    text-align: center;
}

.cta-title {
    font-size: var(--font-size-h2);
    font-weight: 700;
    color: var(--color-gray);
    margin-bottom: var(--spacing-sm);
}

.cta-subtitle {
    font-size: var(--font-size-large);
    color: var(--color-gray-light);
    margin-bottom: var(--spacing-xl);
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* ==========================================
   FOOTER
   ========================================== */
.footer {
    background-color: var(--color-gray);
    color: var(--color-gray-lightest);
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.footer-heading {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--color-gray-lightest);
    font-size: var(--font-size-small);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-white);
}

.footer-text {
    font-size: var(--font-size-small);
    color: var(--color-gray-lightest);
    line-height: 1.6;
}

.footer-bottom {
    border-top: 1px solid var(--color-gray-light);
    padding-top: var(--spacing-md);
    text-align: center;
    font-size: var(--font-size-small);
    color: var(--color-gray-lightest);
}

/* ==========================================
   WARNING / NOTICE BOX
   ========================================== */
.warning-box {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: #fff3cd;
    border-left: 4px solid var(--color-orange);
    border-radius: var(--border-radius-md);
}

.warning-box-title {
    margin-top: 0;
    color: var(--color-orange);
}

.warning-box-list {
    color: var(--color-gray-light);
    line-height: 1.8;
    margin-left: var(--spacing-md);
}

.warning-box-note {
    color: var(--color-gray-light);
}

/* ==========================================
   RESPONSIVE DESIGN
   ========================================== */

/* Mobile (up to 480px) */
@media (max-width: 480px) {
    :root {
        --font-size-h1: 32px;
        --font-size-h2: 28px;
        --font-size-h3: 20px;
        --spacing-xxl: 32px;
        --spacing-xl: 24px;
    }

    .hero-stats,
    .vouchers-grid {
        gap: var(--spacing-md);
    }

    .stat {
        min-width: 120px;
    }

    .stat-number {
        font-size: 36px;
    }

    .vouchers-grid {
        grid-template-columns: 1fr;
    }

    .challenges-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .announcements-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .announcement-card {
        padding: var(--spacing-md);
    }

    .announcement-icon {
        font-size: 36px;
    }

    .announcement-title {
        font-size: var(--font-size-h4);
    }

    .announcement-description {
        font-size: var(--font-size-small);
    }

    .announcement-meta {
        flex-direction: column;
        align-items: flex-start;
    }

    .cta-buttons {
        flex-direction: column;
        align-items: stretch;
    }

    .btn-large {
        width: 100%;
    }
}

/* Tablet (481px to 768px) */
@media (min-width: 481px) and (max-width: 768px) {
    :root {
        --font-size-h1: 40px;
        --font-size-h2: 32px;
    }

    .challenges-grid {
        grid-template-columns: 1fr;
    }

    .announcements-grid {
        grid-template-columns: 1fr;
    }
}

/* Desktop (769px to 1200px) - default styles already optimized */

/* Large Desktop (1201px+) */
@media (min-width: 1201px) {
    .challenges-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* ==========================================
   ACCESSIBILITY
   ========================================== */

/* Reduced Motion */
@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-banner::before {
        animation: none !important;
    }
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {
    .challenge-card {
        border: 2px solid var(--color-gray);
    }

    .btn-primary {
        border: 2px solid var(--color-gray);
    }
}

/* Focus Visible (for keyboard navigation) */
:focus-visible {
    outline: 3px solid var(--color-azure-blue);
    outline-offset: 2px;
}

/* 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;
}

/* ==========================================
   NAVIGATION BAR
   ========================================== */
.navbar {
    background: var(--color-white);
    border-bottom: 1px solid var(--color-gray-lighter);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-brand {
    display: flex;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    color: var(--color-gray);
    font-weight: 600;
    font-size: var(--font-size-large);
}

.nav-logo:hover {
    color: var(--color-azure-blue);
}

.azure-logo {
    flex-shrink: 0;
}

.nav-title {
    font-weight: 600;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    margin: 0;
    padding: 0;
}

.nav-link {
    text-decoration: none;
    color: var(--color-gray);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius-sm);
    transition: all var(--transition-base);
}

.nav-link:hover {
    color: var(--color-azure-blue);
    background: var(--color-gray-lightest);
}

.nav-link.active {
    color: var(--color-azure-blue);
    font-weight: 600;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.nav-toggle-icon {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-gray);
    position: relative;
}

.nav-toggle-icon::before,
.nav-toggle-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--color-gray);
    left: 0;
}

.nav-toggle-icon::before {
    top: -8px;
}

.nav-toggle-icon::after {
    bottom: -8px;
}

/* ==========================================
   WHAT YOU'LL LEARN SECTION
   ========================================== */
.what-you-learn {
    padding: var(--spacing-xxl) 0;
    background: var(--color-gray-lightest);
}

.section-description {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl);
    color: var(--color-gray-light);
    font-size: var(--font-size-large);
    line-height: 1.7;
}

.learn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.learn-card {
    background: var(--color-white);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius-lg);
    text-align: center;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
    transition: all var(--transition-base);
}

.learn-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
}

.learn-icon {
    font-size: 48px;
    margin-bottom: var(--spacing-md);
    display: block;
}

.learn-title {
    font-size: var(--font-size-h4);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray);
}

.learn-description {
    color: var(--color-gray-light);
    line-height: 1.6;
    font-size: 15px;
}

/* ==========================================
   AZURE SKILLING EXPERIENCE SECTION
   ========================================== */
.skilling-experience {
    padding: var(--spacing-xxl) 0;
    background: var(--color-white);
}

.experience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.experience-card {
    position: relative;
    display: block;
    text-decoration: none;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    min-height: 320px;
    transition: all var(--transition-base);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.experience-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 16px 32px rgba(0, 0, 0, 0.15);
}

.experience-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.reactor-card .experience-gradient {
    background: linear-gradient(135deg, #0078d4 0%, #5c2d91 100%);
}

.challenges-card .experience-gradient {
    background: linear-gradient(135deg, #5c2d91 0%, #0078d4 100%);
}

.blog-card .experience-gradient {
    background: linear-gradient(135deg, #0078d4 0%, #107c10 100%);
}

.experience-content {
    position: relative;
    z-index: 1;
    padding: var(--spacing-xl);
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    color: var(--color-white);
}

.experience-icon {
    font-size: 56px;
    margin-bottom: var(--spacing-md);
    display: block;
}

.experience-title {
    font-size: var(--font-size-h3);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--color-white);
}

.experience-description {
    color: rgba(255, 255, 255, 0.95);
    line-height: 1.7;
    font-size: 15px;
    margin-bottom: var(--spacing-md);
}

.experience-cta {
    display: inline-block;
    color: var(--color-white);
    font-weight: 600;
    font-size: var(--font-size-large);
    margin-top: auto;
}

.experience-card:hover .experience-cta {
    text-decoration: underline;
}

/* ==========================================
   HOW IT WORKS SECTION
   ========================================== */
.how-it-works {
    padding: var(--spacing-xxl) 0;
    background: var(--color-white);
}

.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.step-card {
    padding: var(--spacing-lg);
    background: var(--color-gray-lightest);
    border-radius: var(--border-radius-lg);
    position: relative;
}

.step-number {
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, var(--color-azure-blue), var(--color-purple));
    color: var(--color-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.step-title {
    font-size: var(--font-size-h4);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray);
}

.step-description {
    color: var(--color-gray-light);
    line-height: 1.6;
    font-size: 15px;
}

/* ==========================================
   FEATURED CHALLENGES SECTION
   ========================================== */
.featured-challenges {
    padding: var(--spacing-xxl) 0;
    background: var(--color-gray-lightest);
}

.featured-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xl);
}

.featured-card {
    background: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.featured-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.12);
}

.featured-label {
    display: inline-block;
    padding: 6px 12px;
    border-radius: 20px;
    font-size: var(--font-size-small);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
    width: fit-content;
}

.ai-featured .featured-label {
    background: linear-gradient(135deg, rgba(0, 120, 212, 0.15), rgba(92, 45, 145, 0.15));
    color: var(--color-azure-blue);
}

.data-featured .featured-label {
    background: linear-gradient(135deg, rgba(92, 45, 145, 0.15), rgba(0, 120, 212, 0.15));
    color: var(--color-purple);
}

.migrate-featured .featured-label {
    background: linear-gradient(135deg, rgba(0, 120, 212, 0.15), rgba(16, 124, 16, 0.15));
    color: var(--color-azure-blue);
}

.featured-emoji {
    font-size: 64px;
    margin-bottom: var(--spacing-md);
    text-align: center;
    display: block;
}

.featured-title {
    font-size: var(--font-size-h4);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray);
    line-height: 1.3;
}

.featured-desc {
    color: var(--color-gray-light);
    line-height: 1.7;
    font-size: 15px;
    margin-bottom: var(--spacing-md);
    flex-grow: 1;
}

.featured-meta {
    display: flex;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-gray-lighter);
}

.featured-cert {
    padding: 4px 12px;
    background: var(--color-azure-blue);
    color: var(--color-white);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-small);
    font-weight: 600;
}

.featured-level {
    padding: 4px 12px;
    background: var(--color-gray-lightest);
    color: var(--color-gray-light);
    border-radius: var(--border-radius-sm);
    font-size: var(--font-size-small);
    font-weight: 500;
}

.btn-featured {
    margin-top: auto;
}

/* ==========================================
   COMING SOON SECTION
   ========================================== */
.coming-soon {
    padding: var(--spacing-xxl) 0;
    background: var(--color-gray-lightest);
}

.coming-soon-content {
    max-width: 900px;
    margin: 0 auto;
    text-align: center;
}

.coming-soon-icon {
    font-size: 96px;
    margin-bottom: var(--spacing-lg);
}

.coming-soon-title {
    font-size: var(--font-size-h2);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-gray);
}

.coming-soon-description {
    font-size: var(--font-size-large);
    color: var(--color-gray-light);
    line-height: 1.7;
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.coming-soon-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin: var(--spacing-xxl) 0;
}

.coming-soon-feature {
    background: var(--color-white);
    padding: var(--spacing-xl);
    border-radius: var(--border-radius-lg);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

.coming-soon-feature h3 {
    font-size: var(--font-size-h4);
    margin-bottom: var(--spacing-sm);
    color: var(--color-gray);
}

.coming-soon-feature p {
    color: var(--color-gray-light);
    line-height: 1.6;
}

.coming-soon-cta {
    margin-top: var(--spacing-xl);
}

/* ==========================================
   RESPONSIVE - MOBILE NAVIGATION
   ========================================== */
@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--color-white);
        flex-direction: column;
        gap: 0;
        padding: var(--spacing-sm) 0;
        box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
    }

    .nav-links.active {
        display: flex;
    }

    .nav-link {
        padding: var(--spacing-sm) var(--spacing-lg);
        border-radius: 0;
    }

    .experience-grid {
        grid-template-columns: 1fr;
    }

    .featured-grid {
        grid-template-columns: 1fr;
    }

    .steps-grid {
        grid-template-columns: 1fr;
    }

    .learn-grid {
        grid-template-columns: 1fr;
    }
}

/* ==========================================
   PRINT STYLES
   ========================================== */
@media print {
    .event-ribbon,
    .footer {
        display: none;
    }

    body {
        background-color: var(--color-white);
    }

    .challenge-card {
        break-inside: avoid;
        page-break-inside: avoid;
    }
}