/* Modern UI System with Manrope Font */
@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&display=swap');

:root {
    /* Color Tokens */
    --bg: #FFFFFF;
    --text: #1F2937;
    --muted: #6B7280;
    --primary: #0070F3;
    --accent: #00D8A4;
    --card: #F9FAFB;
    --border: #E5E7EB;
    
    /* Spacing & Layout */
    --section-padding: 4rem 0;
    --hero-padding: 7rem 0 4rem;
    --gap: 2rem;
    --border-radius: 12px;
    --border-radius-lg: 16px;
}

/* Dark Theme */
html.dark {
    --bg: #0F172A;
    --text: #F1F5F9;
    --muted: #94A3B8;
    --primary: #3B82F6;
    --accent: #60A5FA;
    --card: #1E293B;
    --border: #334155;
}

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

body {
    font-family: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg);
    color: var(--text);
    line-height: 1.7;
    font-size: 16px;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* Container System */
.container {
    width: min(1100px, 92%);
    margin: 0 auto;
}

/* Layout Utilities */
.grid {
    display: grid;
    gap: var(--gap);
}

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

.grid.three {
    grid-template-columns: repeat(3, 1fr);
}

.grid.four {
    grid-template-columns: repeat(4, 1fr);
}

.flex {
    display: flex;
}

.between {
    justify-content: space-between;
}

.center {
    align-items: center;
}

/* Global Spacing */
.section {
    padding: var(--section-padding);
}

/* Animation Classes */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.appear {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-left.appear {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.slide-in-right.appear {
    opacity: 1;
    transform: translateX(0);
}

/* Typography */
h1, h2, h3, h4 {
    line-height: 1.2;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text);
}

h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    line-height: 1.1;
}

h2 {
    font-size: 2.25rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1.5rem;
    color: var(--text);
    font-size: 1.05rem;
}

.lead {
    color: var(--muted);
    font-size: 1.125rem;
}

.muted {
    color: var(--muted);
}

.gradient {
    background: linear-gradient(90deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Site Header */
.site-header {
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    padding: 1rem 0;
    z-index: 100;
    transition: all 0.3s ease;
}

html.dark .site-header {
    background-color: rgba(15, 23, 42, 0.9);
}

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

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    text-decoration: none;
    color: var(--text);
}

.nav {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav a {
    text-decoration: none;
    color: var(--muted);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color 0.2s ease;
    position: relative;
}

.nav a:hover,
.nav a.active {
    color: var(--primary);
}

.nav a.active::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--primary);
    border-radius: 1px;
}

/* Theme Toggle */
.theme-toggle {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1.2rem;
    transition: all 0.2s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
    border-color: var(--primary);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 0.9rem;
    text-decoration: none;
    text-align: center;
    transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    border: none;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    color: white;
}

.btn--primary {
    background: var(--primary);
}

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

.btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: 0.5s;
}

.btn:hover::before {
    left: 100%;
}

/* Hero Section */
.hero {
    padding: var(--hero-padding);
}

.hero__title {
    margin-bottom: 1.5rem;
}

.hero .lead {
    margin-bottom: 2rem;
    font-size: 1.125rem;
}

.badges {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-top: 2rem;
}

.badges li {
    padding: 0.5rem 1rem;
    border: 1px dashed var(--border);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--muted);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

/* Cards */
.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--border-radius-lg);
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    opacity: 0;
    transform: translateY(20px);
}

.card.appear {
    opacity: 1;
    transform: translateY(0);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    border-color: rgba(0, 112, 243, 0.3);
}

/* CTA Band */
.cta {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    text-align: center;
    padding: 4rem 0;
    border-radius: var(--border-radius);
    margin: 3rem 0;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.cta.appear {
    opacity: 1;
    transform: translateY(0);
}

.cta h2 {
    color: white;
    margin-bottom: 1.5rem;
}

.cta .lead {
    color: rgba(255, 255, 255, 0.9);
}

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

/* Footer */
.footer {
    border-top: 1px solid var(--border);
    padding: 3rem 0;
    margin-top: 3rem;
    background-color: var(--card);
}

html.dark .footer {
    background-color: var(--card);
}

.footnote {
    color: var(--muted);
    font-size: 0.875rem;
    margin-top: 2rem;
    text-align: center;
}

.footer h4 {
    color: var(--text);
    margin-bottom: 1rem;
}

.footer ul {
    list-style: none;
}

.footer li {
    margin-bottom: 0.75rem;
}

.footer a {
    text-decoration: none;
    color: var(--muted);
    font-size: 0.9rem;
    transition: color 0.2s ease;
}

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

/* Prose Pages */
.prose {
    max-width: 700px;
    margin: 0 auto;
    padding: var(--section-padding);
}

.prose h1,
.prose h2,
.prose h3 {
    color: var(--text);
}

.prose h1 {
    margin-bottom: 1.5rem;
}

.prose h2 {
    margin: 2.5rem 0 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.prose p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text);
}

.prose ul,
.prose ol {
    margin: 1.5rem 0;
    padding-left: 2rem;
}

.prose li {
    margin-bottom: 0.75rem;
    color: var(--text);
}

.prose a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    position: relative;
}

.prose a:hover {
    text-decoration: underline;
}

.prose a::after {
    content: '↗';
    margin-left: 0.25rem;
    font-size: 0.8em;
}

/* Roadmap */
.roadmap {
    list-style: none;
    counter-reset: step;
}

.roadmap li {
    counter-increment: step;
    margin-bottom: 2rem;
    padding-left: 3rem;
    position: relative;
    opacity: 0;
    transform: translateX(-20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.roadmap li.appear {
    opacity: 1;
    transform: translateX(0);
}

.roadmap li h3 {
    color: var(--text);
    margin-bottom: 0.5rem;
}

.roadmap li p {
    color: var(--muted);
    margin-bottom: 1rem;
}

.roadmap li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 2rem;
    height: 2rem;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1rem;
    transition: transform 0.3s ease;
}

.roadmap li:hover::before {
    transform: scale(1.1);
}

/* Flowchart */
.flowchart {
    width: 100%;
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 1rem;
    background: var(--card);
    margin: 2rem 0;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.flowchart.appear {
    opacity: 1;
    transform: translateY(0);
}

/* Mermaid Diagrams */
.mermaid {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--border-radius);
    padding: 2rem;
    margin: 2rem 0;
    text-align: center;
    overflow-x: auto;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
    color: var(--text);
    font-family: 'Manrope', sans-serif;
    font-size: 16px;
    line-height: 1.5;
}

.mermaid.appear {
    opacity: 1;
    transform: translateY(0);
}

/* Mermaid diagram styling for both themes */
.mermaid svg {
    width: 100%;
    max-width: 100%;
    height: auto;
}

/* Light theme mermaid styles */
.mermaid .node rect,
.mermaid .node circle,
.mermaid .node ellipse,
.mermaid .node polygon,
.mermaid .node path {
    fill: var(--card);
    stroke: var(--border);
    stroke-width: 1px;
}

.mermaid .node .label {
    color: var(--text);
}

.mermaid .edgePath path {
    stroke: var(--text);
    stroke-width: 1.5px;
}

.mermaid .edgeLabel {
    background-color: var(--bg);
    color: var(--text);
    padding: 2px 4px;
    border-radius: 2px;
}

.mermaid .cluster rect {
    fill: rgba(0, 112, 243, 0.05);
    stroke: var(--border);
    stroke-width: 1px;
}

/* Dark theme mermaid styles */
html.dark .mermaid .node rect,
html.dark .mermaid .node circle,
html.dark .mermaid .node ellipse,
html.dark .mermaid .node polygon,
html.dark .mermaid .node path {
    fill: var(--card);
    stroke: var(--border);
}

html.dark .mermaid .node .label {
    color: var(--text);
}

html.dark .mermaid .edgePath path {
    stroke: var(--text);
}

html.dark .mermaid .edgeLabel {
    background-color: var(--bg);
    color: var(--text);
}

html.dark .mermaid .cluster rect {
    fill: rgba(59, 130, 246, 0.1);
    stroke: var(--border);
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin: 2rem 0;
    background: var(--card);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

table.appear {
    opacity: 1;
    transform: translateY(0);
}

th, td {
    padding: 1.25rem 1.5rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
    color: var(--text);
}

th {
    background: var(--card);
    font-weight: 700;
    color: var(--text);
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.05em;
}

tr:last-child td {
    border-bottom: none;
}

tr:nth-child(even) {
    background-color: rgba(0, 112, 243, 0.03);
}

tr:hover {
    background-color: rgba(0, 112, 243, 0.05);
}

/* Responsive Design */
@media (max-width: 900px) {
    .grid.two,
    .grid.three,
    .grid.four {
        grid-template-columns: 1fr;
    }
    
    .site-header .container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav {
        gap: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .hero {
        padding: 4rem 0;
        text-align: center;
    }
    
    .badges {
        justify-content: center;
    }
    
    .prose {
        padding: 3rem 1rem;
    }
    
    .nav a.active::after {
        display: none;
    }
    
    .mermaid {
        padding: 1rem;
    }
}

@media (max-width: 600px) {
    .section {
        padding: 3rem 0;
    }
    
    h2 {
        font-size: 1.75rem;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .badges li {
        font-size: 0.75rem;
    }
    
    .mermaid {
        padding: 1rem;
        font-size: 14px;
    }
}