/* ====================================
   CSS Variables & Reset
   ==================================== */
:root {
    /* Color System */
    --color-background: #0a0e1a;
    --color-surface: #111827;
    --color-surface-elevated: #1a2234;
    --color-border: #1f2937;
    --color-text-primary: #f9fafb;
    --color-text-secondary: #9ca3af;
    --color-text-muted: #6b7280;

    /* Brand Colors */
    --color-primary: #3b82f6;
    --color-primary-hover: #2563eb;
    --color-accent: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;

    /* Gradient */
    --gradient-primary: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    --gradient-accent: linear-gradient(135deg, #10b981 0%, #3b82f6 100%);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -1px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -2px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.6), 0 10px 10px -5px rgba(0, 0, 0, 0.4);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue', sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.6;
    font-size: 16px;
}

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

@media (max-width: 640px) {
    .container {
        padding: 0 var(--spacing-md);
    }
}

/* ====================================
   Header
   ==================================== */
.header {
    padding: var(--spacing-lg) 0;
    background-color: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(12px);
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--color-border);
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.brand-icon {
    color: var(--color-primary);
}

.brand-name {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
}

/* ====================================
   Hero Section
   ==================================== */
.hero {
    padding: var(--spacing-3xl) 0;
    text-align: center;
    background: radial-gradient(ellipse at top, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
}

.hero-title {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(135deg, #f9fafb 0%, #9ca3af 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.7;
}

@media (min-width: 768px) {
    .hero {
        padding: 5rem 0;
    }

    .hero-title {
        font-size: 2.75rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }
}

.hero-cta-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    max-width: 600px;
    margin: 0 auto;
}

/* ====================================
   Buttons
   ==================================== */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    outline: none;
}

.cta-button.primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: var(--shadow-md);
}

.cta-button.primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.cta-button.primary:active {
    transform: translateY(0);
}

@media (min-width: 768px) {
    .cta-button {
        padding: var(--spacing-lg) var(--spacing-2xl);
        font-size: 1.063rem;
        white-space: nowrap;
    }
}

@media (max-width: 640px) {
    .cta-button {
        width: 100%;
        justify-content: center;
        padding: var(--spacing-md) var(--spacing-lg);
        font-size: 0.938rem;
    }

    .hero-cta-wrapper {
        width: 100%;
    }
}

/* ====================================
   Disclaimer
   ==================================== */
.disclaimer {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-md);
    color: var(--color-warning);
    font-size: 0.875rem;
}

.disclaimer.small {
    font-size: 0.813rem;
}

.disclaimer svg {
    flex-shrink: 0;
}

/* ====================================
   Sections
   ==================================== */
section {
    padding: var(--spacing-3xl) 0;
}

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

.section-header h2 {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.75rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-md);
}

.section-icon {
    color: var(--color-primary);
}

@media (max-width: 640px) {
    .section-header h2 {
        font-size: 1.5rem;
        flex-direction: column;
    }
}

/* ====================================
   Grid & Cards
   ==================================== */
.grid {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

@media (min-width: 640px) {
    .grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .grid {
        grid-template-columns: repeat(4, 1fr);
    }
}

.card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    transition: all var(--transition-base);
    cursor: default;
}

.card:hover {
    background-color: var(--color-surface-elevated);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

.card-icon.blue {
    background: rgba(59, 130, 246, 0.15);
    color: #3b82f6;
}

.card-icon.green {
    background: rgba(16, 185, 129, 0.15);
    color: #10b981;
}

.card-icon.purple {
    background: rgba(139, 92, 246, 0.15);
    color: #8b5cf6;
}

.card-icon.yellow {
    background: rgba(245, 158, 11, 0.15);
    color: #f59e0b;
}

.card-icon.pink {
    background: rgba(236, 72, 153, 0.15);
    color: #ec4899;
}

.card h3 {
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-primary);
}

.card p {
    font-size: 0.938rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

/* ====================================
   Educational Notice
   ==================================== */
.educational-notice {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background-color: rgba(245, 158, 11, 0.1);
    border: 1px solid rgba(245, 158, 11, 0.2);
    border-radius: var(--radius-md);
    color: var(--color-warning);
    font-size: 0.875rem;
    text-align: center;
}

/* ====================================
   Learning Path - Steps
   ==================================== */
.steps {
    display: grid;
    grid-template-columns: repeat(1, 1fr);
    gap: var(--spacing-xl);
}

@media (min-width: 768px) {
    .steps {
        grid-template-columns: repeat(3, 1fr);
    }
}

.step-card {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    position: relative;
    transition: all var(--transition-base);
}

.step-card:hover {
    background-color: var(--color-surface-elevated);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.step-number {
    position: absolute;
    top: -16px;
    left: var(--spacing-xl);
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
    color: white;
    box-shadow: var(--shadow-md);
}

.step-card h3 {
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-lg);
    margin-top: var(--spacing-sm);
    color: var(--color-text-primary);
}

.step-card ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.step-card li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    font-size: 0.938rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.step-card li svg {
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--color-accent);
}

/* ====================================
   Community Section
   ==================================== */
.community {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.community-description {
    text-align: center;
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-2xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.community-image {
    margin-bottom: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    overflow: hidden;
}

.community-image img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-xl);
}

.image-placeholder {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1) 0%, rgba(139, 92, 246, 0.1) 100%);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    aspect-ratio: 16/9;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
}

.community-info {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.community-info p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
    line-height: 1.7;
}

/* ====================================
   FAQ Section
   ==================================== */
.faq {
    background-color: var(--color-background);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.faq-item {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

.faq-item[open] {
    background-color: var(--color-surface-elevated);
}

.faq-item summary {
    padding: var(--spacing-lg);
    cursor: pointer;
    user-select: none;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.faq-item summary::-webkit-details-marker {
    display: none;
}

.faq-item summary:hover {
    color: var(--color-primary);
}

.faq-item summary svg {
    flex-shrink: 0;
    transition: transform var(--transition-base);
    color: var(--color-text-muted);
}

.faq-item[open] summary svg {
    transform: rotate(180deg);
    color: var(--color-primary);
}

.faq-content {
    padding: 0 var(--spacing-lg) var(--spacing-lg) var(--spacing-lg);
}

.faq-content p {
    color: var(--color-text-secondary);
    line-height: 1.7;
    font-size: 0.938rem;
}

/* ====================================
   Footer
   ==================================== */
.footer {
    background-color: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: var(--spacing-2xl) 0;
    padding-bottom: 120px;
    margin-top: var(--spacing-3xl);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.footer-links a {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.938rem;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    background-color: rgba(59, 130, 246, 0.05);
}

.footer-links a svg {
    flex-shrink: 0;
}

.copyright {
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.875rem;
}

/* ====================================
   Legal Pages
   ==================================== */
.legal-content {
    padding: var(--spacing-3xl) 0;
    min-height: 60vh;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.938rem;
    margin-bottom: var(--spacing-xl);
    transition: all var(--transition-fast);
}

.back-link:hover {
    color: var(--color-primary);
    transform: translateX(-4px);
}

.legal-content h1 {
    font-size: 2rem;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xl);
    color: var(--color-text-primary);
}

.legal-text {
    max-width: 800px;
}

.legal-text p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
}

@media (min-width: 768px) {
    .legal-content h1 {
        font-size: 2.5rem;
    }
}

/* ====================================
   Utilities
   ==================================== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Selection */
::selection {
    background-color: rgba(59, 130, 246, 0.3);
    color: var(--color-text-primary);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 12px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--color-surface-elevated);
    border-radius: 6px;
    border: 3px solid var(--color-background);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-border);
}

/* ====================================
   Modal
   ==================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: 1000;
    overflow-y: auto;
    animation: fadeIn var(--transition-base);
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.modal-content {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    max-width: 800px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    padding: var(--spacing-2xl);
    position: relative;
    animation: slideUp var(--transition-base);
    box-shadow: var(--shadow-xl);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-title {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

.modal-close {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    flex-shrink: 0;
}

.modal-close:hover {
    background-color: rgba(239, 68, 68, 0.1);
    border-color: var(--color-danger);
    color: var(--color-danger);
}

.modal-body {
    color: var(--color-text-secondary);
    line-height: 1.8;
    font-size: 1rem;
}

.modal-body p {
    margin-bottom: var(--spacing-lg);
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@media (max-width: 640px) {
    .modal-content {
        padding: var(--spacing-lg);
        max-height: 95vh;
    }

    .modal-title {
        font-size: 1.25rem;
    }

    .modal-body {
        font-size: 0.938rem;
    }

    .footer-links {
        gap: var(--spacing-sm);
    }

    .footer-links a {
        font-size: 0.813rem;
        padding: var(--spacing-xs) var(--spacing-sm);
        gap: 4px;
    }

    .footer-links a svg {
        width: 14px;
        height: 14px;
    }
}

/* ====================================
   Floating CTA Button
   ==================================== */
.floating-cta {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 999;
    padding: var(--spacing-lg);
    pointer-events: none;
    animation: slideInUp 0.5s ease-out;
}

.floating-cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 8px 32px rgba(59, 130, 246, 0.4);
    transition: all var(--transition-base);
    cursor: pointer;
    border: none;
    outline: none;
    pointer-events: auto;
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
    display: flex;
    animation: pulse 2s ease-in-out infinite;
}

.floating-cta-button:hover {
    animation: none;
    transform: translateY(-4px) scale(1);
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.5);
}

.floating-cta-button:active {
    transform: translateY(-2px) scale(1);
}

.floating-cta-button svg {
    flex-shrink: 0;
}

@keyframes slideInUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@keyframes pulse {
    0%, 100% {
        box-shadow: 0 8px 32px rgba(59, 130, 246, 0.4);
        transform: scale(1);
    }
    50% {
        box-shadow: 0 12px 48px rgba(59, 130, 246, 0.6);
        transform: scale(1.02);
    }
}

@media (min-width: 768px) {
    .floating-cta-button {
        padding: var(--spacing-lg) var(--spacing-2xl);
        font-size: 1.063rem;
    }
}

@media (max-width: 640px) {
    .floating-cta {
        padding: var(--spacing-md);
    }

    .floating-cta-button {
        font-size: 0.938rem;
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .floating-cta-button span {
        font-size: 0.875rem;
    }

    .footer {
        padding-bottom: 100px;
    }
}