:root {
    --bg-primary: #0d1117;
    --bg-secondary: #161b22;
    --bg-tertiary: #1c2128;
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --text-muted: #6e7681;
    --accent-blue: #58a6ff;
    --accent-green: #3fb950;
    --accent-red: #f85149;
    --accent-yellow: #d29922;
    --accent-purple: #bc8cff;
    --border-color: #30363d;
    --border-subtle: #21262d;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", Helvetica, Arial, sans-serif;
    --font-mono: "SF Mono", "Cascadia Code", "Fira Code", "JetBrains Mono", Consolas, monospace;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

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

.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* HEADER */
header {
    text-align: center;
    padding: 4rem 0 3rem;
    border-bottom: 1px solid var(--border-subtle);
    margin-bottom: 4rem;
}

h1 {
    font-size: 3.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
}

.tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.badges {
    display: flex;
    gap: 0.75rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.badge {
    display: inline-block;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.3rem 0.85rem;
    border-radius: 20px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.header-nav {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

.header-nav a {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: opacity 0.2s;
}

.header-nav a:hover {
    opacity: 0.8;
    text-decoration: underline;
}

/* SECTIONS */
section {
    margin-bottom: 4rem;
}

h2 {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1.25rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-primary);
}

h3 {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--accent-blue);
}

p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
    font-size: 1rem;
}

/* STATS GRID */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.stat-card {
    text-align: center;
    padding: 1.5rem 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-blue);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* DEMO SECTION */
.demo-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

@media (max-width: 768px) {
    .demo-wrapper {
        grid-template-columns: 1fr;
    }
}

.demo-panel {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.panel-label {
    background: var(--bg-tertiary);
    padding: 0.6rem 1rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-bottom: 1px solid var(--border-color);
}

.input-area {
    width: 100%;
    min-height: 280px;
    padding: 1rem;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.6;
    resize: vertical;
    outline: none;
}

.input-area::placeholder {
    color: var(--text-muted);
}

.output-area {
    min-height: 280px;
    padding: 1rem;
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.7;
    overflow-x: auto;
    white-space: pre-wrap;
    word-wrap: break-word;
    background: transparent;
    border: none;
    color: var(--accent-green);
}

.placeholder-text {
    color: var(--text-muted);
    font-style: italic;
}

.button-row {
    padding: 0.75rem 1rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 0.5rem;
}

.btn {
    padding: 0.65rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: opacity 0.2s, transform 0.1s;
    font-family: var(--font-sans);
}

.btn-primary {
    background: var(--accent-blue);
    color: var(--bg-primary);
}

.btn-primary:hover {
    opacity: 0.9;
}

.btn-primary:active {
    transform: scale(0.98);
}

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

.btn-secondary:hover {
    background: var(--bg-tertiary);
}

/* TOKENS GRID */
.tokens-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 0.75rem;
    margin-top: 1.25rem;
}

.token-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.token-card code {
    color: var(--accent-purple);
    font-family: var(--font-mono);
    font-weight: 600;
    font-size: 0.85rem;
}

.token-card span {
    color: var(--text-muted);
    font-size: 0.82rem;
}

/* CODE BLOCK */
.code-block {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin-top: 1rem;
}

.code-block pre {
    padding: 1.25rem;
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    line-height: 1.7;
    color: var(--accent-green);
}

/* USE CASES GRID */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-top: 1.25rem;
}

.case-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: var(--radius-md);
}

.case-card p {
    font-size: 0.92rem;
    margin-top: 0.5rem;
    margin-bottom: 0;
}

.case-card code {
    background: var(--bg-tertiary);
    padding: 0.15rem 0.4rem;
    border-radius: 3px;
    font-family: var(--font-mono);
    font-size: 0.82rem;
    color: var(--accent-blue);
}

/* ABOUT / LINKS */
.links-row {
    display: flex;
    gap: 1.25rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.links-row a {
    color: var(--accent-blue);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

.links-row a:hover {
    color: var(--accent-purple);
    text-decoration: underline;
}

/* FOOTER */
footer {
    text-align: center;
    padding: 2rem 0 1rem;
    border-top: 1px solid var(--border-subtle);
    margin-top: 4rem;
    color: var(--text-muted);
    font-size: 0.88rem;
}

footer p {
    color: var(--text-muted);
    margin-bottom: 0.25rem;
}

/* RESPONSIVE */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    h2 {
        font-size: 1.4rem;
    }

    .container {
        padding: 1rem;
    }

    header {
        padding: 2.5rem 0 2rem;
        margin-bottom: 2.5rem;
    }

    section {
        margin-bottom: 2.5rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 2rem;
    }

    .stats-grid {
        grid-template-columns: 1fr 1fr;
        gap: 0.75rem;
    }

    .stat-number {
        font-size: 1.75rem;
    }
}