/* ========================================
   CSS Reset & Base Styles
   ======================================== */

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

:root {
    /* Resend-inspired Color Palette */
    --color-bg-primary: #000000;
    --color-bg-secondary: #0a0a0a;
    --color-bg-tertiary: #141414;
    --color-bg-code: #0f0f0f;
    --color-bg-code-header: #1a1a1a;

    --color-text-primary: #ffffff;
    --color-text-secondary: #a1a1a1;
    --color-text-tertiary: #737373;

    --color-accent: #00a3ff;
    --color-accent-hover: #0091e6;

    --color-border: #262626;
    --color-border-light: #1f1f1f;

    /* Syntax Highlighting - One Dark Theme */
    --color-keyword: #c678dd;
    --color-function: #61afef;
    --color-string: #98c379;
    --color-property: #e06c75;
    --color-number: #d19a66;
    --color-boolean: #d19a66;
    --color-comment: #5c6370;

    /* Window Dots */
    --color-dot-red: #ff5f56;
    --color-dot-yellow: #ffbd2e;
    --color-dot-green: #27c93f;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Typography */
    --font-sans: 'Geist Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    background: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   Top Navigation
   ======================================== */

.top-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-md) var(--spacing-lg);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
}

.nav-home-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    transition: all var(--transition-base);
    border: 1px solid var(--color-border);
}

.nav-home-btn:hover {
    background: var(--color-bg-secondary);
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.nav-home-btn svg {
    width: 16px;
    height: 16px;
}

/* ========================================
   Container & Layout
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

/* ========================================
   Hero Section
   ======================================== */

.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(ellipse at top, rgba(0, 163, 255, 0.1) 0%, transparent 50%),
                linear-gradient(180deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 100%);
    border-bottom: 1px solid var(--color-border);
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    width: 100%;
}

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

.hero-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg) !important;
    letter-spacing: -0.02em;
    line-height: 1.15;
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: var(--font-size-xl);
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-top: 0 !important;
    margin-bottom: var(--spacing-xl);
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    animation: fadeInUp 0.8s ease-out 0.4s backwards;
}

.cta-btn {
    padding: 0.875rem 1.75rem;
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
}

.cta-btn.primary {
    background: #ffffff;
    color: #000000;
}

.cta-btn.primary:hover {
    background: #f5f5f5;
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 255, 255, 0.2);
}

.cta-btn.secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.cta-btn.secondary:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-accent);
    transform: translateY(-2px);
}

.hero-code {
    animation: fadeInUp 0.8s ease-out 0.6s backwards;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-tertiary);
    animation: fadeInUp 1s ease-out 1s backwards, bounce 2s ease-in-out 2s infinite;
}

.scroll-arrow {
    color: #ffffff;
}

/* ========================================
   Content Blocks
   ======================================== */

.content-block {
    max-width: 800px;
    margin: 0 auto;
}

.section-title {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

.section-text {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
}

/* Introduction Section */
.intro-section {
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border-light);
    text-align: center;
}

.intro-section .section-title {
    font-size: var(--font-size-4xl);
}

.intro-section .section-text {
    font-size: var(--font-size-xl);
}

/* ========================================
   Feature Sections
   ======================================== */

.feature-section {
    border-bottom: 1px solid var(--color-border-light);
}

.feature-section.alt {
    background: var(--color-bg-secondary);
}

.feature-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.feature-grid.reverse {
    direction: rtl;
}

.feature-grid.reverse > * {
    direction: ltr;
}

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

.feature-label {
    display: inline-block;
    font-size: var(--font-size-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-accent);
    margin-bottom: var(--spacing-sm);
}

.feature-title {
    font-size: var(--font-size-3xl);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.01em;
}

.feature-description {
    font-size: var(--font-size-lg);
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

/* ========================================
   Feature Lists
   ======================================== */

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.list-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-base);
}

.list-item:hover {
    border-color: var(--color-border);
}

.list-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text-primary);
    font-family: var(--font-mono);
}

.list-value {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    line-height: 1.6;
}

/* ========================================
   Code Window Component
   ======================================== */

.code-window {
    background: var(--color-bg-code);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.5);
}

.code-header {
    display: flex;
    align-items: center;
    padding: 0.875rem 1rem;
    background: var(--color-bg-code-header);
    border-bottom: 1px solid var(--color-border);
}

.code-dots {
    display: flex;
    gap: 0.5rem;
    margin-right: 0.875rem;
}

.code-dots span {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.code-dots span:nth-child(1) {
    background: var(--color-dot-red);
}

.code-dots span:nth-child(2) {
    background: var(--color-dot-yellow);
}

.code-dots span:nth-child(3) {
    background: var(--color-dot-green);
}

.code-title {
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    font-weight: 500;
}

.code-content {
    padding: var(--spacing-lg);
    overflow-x: auto;
}

.hero-code .code-content {
    min-height: 320px;
    display: flex;
    align-items: flex-start;
}

.hero-code .code-content pre {
    width: 100%;
    min-height: 320px;
    text-align: left;
}

.hero-code .code-content code {
    display: block;
    min-height: 320px;
    text-align: left;
}

.code-content pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    line-height: 1.7;
    color: var(--color-text-primary);
}

.code-content code {
    font-family: inherit;
}

/* ========================================
   Syntax Highlighting
   ======================================== */

.code-keyword {
    color: var(--color-keyword);
}

.code-function {
    color: var(--color-function);
}

.code-string {
    color: var(--color-string);
}

.code-property {
    color: var(--color-property);
}

.code-number {
    color: var(--color-number);
}

.code-boolean {
    color: var(--color-boolean);
}

.code-comment {
    color: var(--color-comment);
    font-style: italic;
}

/* ========================================
   Code Output
   ======================================== */

.code-output {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
    min-height: 60px;
    display: none;
}

.code-output.visible {
    display: block;
}

.code-output pre {
    margin: 0;
    white-space: pre-wrap;
    word-wrap: break-word;
}

/* ========================================
   Interactive Elements
   ======================================== */

.interactive-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    font-weight: 500;
    color: #000000;
    background: #ffffff;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
}

.interactive-btn:hover {
    background: #f5f5f5;
    transform: translateY(-1px);
}

.interactive-btn:active {
    transform: translateY(0);
}

.interactive-btn.full-width {
    width: 100%;
    margin-top: var(--spacing-md);
}

/* ========================================
   Interactive Demo
   ======================================== */

.interactive-demo {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.demo-label {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.demo-input {
    padding: 0.625rem 0.875rem;
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    color: var(--color-text-primary);
    background: var(--color-bg-code);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    outline: none;
    transition: border-color var(--transition-base);
}

.demo-input:focus {
    border-color: var(--color-accent);
}

.demo-slider {
    width: 100%;
    height: 4px;
    background: var(--color-bg-code);
    border-radius: var(--radius-sm);
    outline: none;
    -webkit-appearance: none;
}

.demo-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: var(--color-accent);
    border-radius: 50%;
    cursor: pointer;
}

.demo-slider::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--color-accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

.demo-value {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-accent);
    background: var(--color-bg-code);
    border-radius: var(--radius-sm);
}

.async-status {
    padding: var(--spacing-md);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    background: var(--color-bg-code);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    min-height: 80px;
    margin-top: var(--spacing-md);
}

/* ========================================
   Playground Section
   ======================================== */

.playground-section {
    background: var(--color-bg-secondary);
    padding: var(--spacing-3xl) 0;
}

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

.playground-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
}

.playground-textarea {
    width: 100%;
    min-height: 300px;
    padding: var(--spacing-lg);
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    line-height: 1.7;
    color: var(--color-text-primary);
    background: transparent;
    border: none;
    outline: none;
    resize: vertical;
}

.playground-textarea:focus {
    outline: none;
    border: none;
    box-shadow: none;
}

/* Custom Scrollbar for Playground */
.playground-textarea::-webkit-scrollbar,
.code-content::-webkit-scrollbar,
.console-output::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

.playground-textarea::-webkit-scrollbar-track,
.code-content::-webkit-scrollbar-track,
.console-output::-webkit-scrollbar-track {
    background: var(--color-bg-code);
}

.playground-textarea::-webkit-scrollbar-thumb,
.code-content::-webkit-scrollbar-thumb,
.console-output::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-sm);
}

.playground-textarea::-webkit-scrollbar-thumb:hover,
.code-content::-webkit-scrollbar-thumb:hover,
.console-output::-webkit-scrollbar-thumb:hover {
    background: var(--color-accent);
}

/* Firefox Scrollbar */
.playground-textarea,
.code-content,
.console-output {
    scrollbar-width: thin;
    scrollbar-color: var(--color-border) var(--color-bg-code);
}

.console-output {
    min-height: 300px;
    font-family: var(--font-mono);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.console-line {
    padding: 0.25rem 0;
    border-bottom: 1px solid var(--color-border-light);
}

.console-line:last-child {
    border-bottom: none;
}

.console-line.error {
    color: #ff5555;
}

.console-line.log {
    color: var(--color-text-secondary);
}

.clear-btn {
    margin-left: auto;
    padding: 0.375rem 0.75rem;
    font-family: var(--font-sans);
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-text-tertiary);
    background: transparent;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.clear-btn:hover {
    color: var(--color-text-primary);
    border-color: var(--color-border);
    background: var(--color-bg-code);
}

/* ========================================
   Conclusion Section
   ======================================== */

.conclusion-section {
    text-align: center;
    padding: var(--spacing-3xl) 0;
    border-top: 1px solid var(--color-border-light);
}

.conclusion-content {
    max-width: 700px;
    margin: 0 auto;
}

/* ========================================
   Footer
   ======================================== */

.footer {
    padding: var(--spacing-2xl) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border-light);
}

.footer-content {
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.footer-copyright {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

.footer-powered {
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
}

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

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

/* ========================================
   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 bounce {
    0%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    50% {
        transform: translateX(-50%) translateY(-10px);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease-out;
}

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

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* ========================================
   Responsive Design
   ======================================== */

@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
        text-align: center;
        display: flex;
        flex-direction: column;
    }

    .hero-content {
        order: 1;
        text-align: center;
        display: contents;
    }

    .hero-title {
        order: 1;
    }

    .hero-code {
        order: 2;
        width: 100%;
        max-width: 100%;
    }

    .hero-code .code-window {
        width: 100%;
        max-width: 100%;
    }

    .hero-code .code-content {
        overflow-x: auto;
    }

    .hero-subtitle {
        order: 3;
    }

    .hero-cta {
        order: 4;
        justify-content: center;
    }

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

    .feature-grid.reverse {
        direction: ltr;
    }

    .playground-container {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.75rem;
        --font-size-4xl: 2rem;
        --font-size-5xl: 2.25rem;
    }

    .top-nav {
        padding: var(--spacing-sm) var(--spacing-md);
    }

    .top-nav img {
        max-width: 100px !important;
    }

    .nav-home-btn {
        padding: 0;
        font-size: 0;
        width: 36px;
        height: 36px;
        min-width: 36px;
        min-height: 36px;
        display: flex !important;
        align-items: center;
        justify-content: center;
        gap: 0;
    }

    .nav-home-btn svg {
        width: 18px;
        height: 18px;
        flex-shrink: 0;
    }

    .section {
        padding: var(--spacing-2xl) 0;
    }

    .container {
        padding: 0 var(--spacing-md);
        box-sizing: border-box;
    }

    /* NUCLEAR RESET FOR MOBILE */
    .feature-section {
        overflow-x: hidden !important;
    }

    .feature-section .container {
        padding-left: var(--spacing-md) !important;
        padding-right: var(--spacing-md) !important;
        width: 100vw !important;
        max-width: 100vw !important;
        margin: 0 auto !important;
    }

    .feature-content,
    .feature-code,
    .feature-grid {
        all: unset !important;
        display: block !important;
        width: 100% !important;
        margin: var(--spacing-lg) 0 !important;
    }

    .code-window {
        all: unset !important;
        display: block !important;
        width: 100% !important;
        background: var(--color-bg-code) !important;
        border: 1px solid var(--color-border) !important;
        border-radius: var(--radius-lg) !important;
        overflow: hidden !important;
    }

    .interactive-demo {
        all: unset !important;
        display: flex !important;
        flex-direction: column !important;
        width: 100% !important;
        gap: var(--spacing-md) !important;
        padding: var(--spacing-lg) !important;
        background: var(--color-bg-tertiary) !important;
        border: 1px solid var(--color-border) !important;
        border-radius: var(--radius-md) !important;
        box-sizing: border-box !important;
    }

    .code-content {
        padding: var(--spacing-lg) !important;
        width: 100% !important;
    }

    .feature-list {
        width: 100% !important;
    }

    .list-item {
        width: 100% !important;
    }

    .hero {
        min-height: auto;
        padding: var(--spacing-3xl) 0;
    }

    .hero-title {
        margin-bottom: 0.5rem !important;
    }

    .hero-code {
        margin-bottom: var(--spacing-lg) !important;
    }

    .hero-subtitle {
        margin-bottom: 0.75rem !important;
    }

    .hero-cta {
        flex-direction: column;
    }

    .cta-btn {
        width: 100%;
    }

    .scroll-indicator {
        display: none;
    }

    .code-content {
        padding: var(--spacing-md);
    }

    .code-content pre {
        font-size: var(--font-size-xs);
    }

    .playground-textarea {
        min-height: 350px;
    }

    .console-output {
        min-height: 350px;
    }
}

@media (max-width: 480px) {
    .code-header {
        padding: 0.625rem 0.75rem;
    }

    .code-dots {
        gap: 0.375rem;
    }

    .code-dots span {
        width: 10px;
        height: 10px;
    }

    .code-title {
        font-size: var(--font-size-xs);
    }
}

/* ========================================
   Accessibility
   ======================================== */

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

/* Focus styles */
*:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

/* Selection styles */
::selection {
    background: var(--color-accent);
    color: var(--color-text-primary);
}