/* ZKC Website Styles — Pyramidal ink-and-paper theme (matches zkc.html) */

:root {
    /* Core palette (from zkc.html) */
    --ink: #0a0a0b;
    --ink-2: #101012;
    --paper: #ece6da;
    --paper-soft: #c9c4ba;
    --muted: #7e7a72;
    --line: rgba(236, 230, 218, 0.10);
    --accent: #46a6db;
    --accent-hover: #6fbde6;
    --accent-dim: rgba(70, 166, 219, 0.18);

    /* Legacy aliases — keep existing selectors working on the new palette */
    --bg-primary: var(--ink);
    --bg-secondary: var(--ink-2);
    --bg-tertiary: var(--ink-2);
    --text-primary: var(--paper);
    --text-secondary: var(--paper-soft);
    --text-muted: var(--muted);
    --accent-alt: var(--accent);
    --heading: var(--paper);
    --heading-hover: var(--accent);
    --border: var(--line);
    --code-bg: var(--ink-2);
    --code-border: var(--line);
    --success: #46a6db;
    --warning: #d29922;

    --font-mono: 'IBM Plex Mono', 'SF Mono', 'Monaco', 'Roboto Mono', monospace;
    --font-sans: 'Hanken Grotesk', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-serif: 'Hanken Grotesk', system-ui, sans-serif;
    --font-names: 'Hanken Grotesk', system-ui, sans-serif;
}

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

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

body {
    font-family: var(--font-sans);
    background-color: var(--ink);
    color: var(--paper);
    font-weight: 300;
    line-height: 1.6;
    font-size: 16px;
    overflow-x: hidden;
    position: relative;
}

/* Subtle film grain, matching zkc.html */
body::after {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 200;
    opacity: 0.035;
    mix-blend-mode: overlay;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='180' height='180'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

::selection {
    background: var(--accent-dim);
    color: var(--paper);
}

.container {
    max-width: 1180px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.header {
    background-color: rgba(10, 10, 11, 0.72);
    backdrop-filter: blur(14px) saturate(120%);
    -webkit-backdrop-filter: blur(14px) saturate(120%);
    border-bottom: 1px solid var(--line);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.7rem;
    text-decoration: none;
    font-size: 1rem;
    font-weight: 600;
    color: var(--paper);
}

.logo-img,
.logo-mark {
    height: 26px;
    width: auto;
    display: block;
    flex: none;
}

.logo-text {
    font-family: var(--font-names);
    letter-spacing: 0.28em;
    text-transform: uppercase;
    color: var(--paper);
}

.nav {
    display: flex;
    gap: 1.75rem;
    align-items: center;
}

.nav a {
    font-family: var(--font-mono);
    font-size: 0.72rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--paper-soft);
    text-decoration: none;
    position: relative;
    transition: color 0.3s;
}

.nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -5px;
    height: 1px;
    width: 0;
    background: var(--accent);
    transition: width 0.35s;
}

.nav a:hover {
    color: var(--paper);
}

.nav a:hover::after {
    width: 100%;
}

.nav .github-link {
    color: var(--accent);
    font-weight: 500;
}

/* Hero Section */
.hero {
    padding: 6rem 0 4rem;
    text-align: center;
}

.hero h1 {
    font-family: var(--font-serif);
    font-size: clamp(2.6rem, 6vw, 4.4rem);
    font-weight: 700;
    line-height: 1.05;
    letter-spacing: -0.01em;
    margin-bottom: 1.25rem;
    color: var(--paper);
}

.tagline {
    font-size: clamp(1.15rem, 1.7vw, 1.5rem);
    color: var(--paper-soft);
    margin-bottom: 2rem;
    font-weight: 400;
}

.description {
    font-size: 1.1rem;
    color: var(--paper-soft);
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

/* Features Section */
.features {
    padding: 4rem 0;
    background-color: var(--ink-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.features h2 {
    text-align: center;
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    letter-spacing: -0.01em;
    margin-bottom: 3rem;
    color: var(--paper);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature {
    padding: 1.75rem;
    background-color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 2px;
    transition: background 0.4s, border-color 0.4s;
}

.feature:hover {
    background-color: var(--ink-2);
    border-color: var(--accent-dim);
}

.feature h3 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: -0.01em;
    margin-bottom: 0.75rem;
    color: var(--paper);
}

.feature p {
    color: var(--paper-soft);
    line-height: 1.6;
}

/* Comparison Table Section */
.comparison {
    padding: 4rem 0;
}

.comparison h2 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    letter-spacing: -0.01em;
    margin-bottom: 1.5rem;
    color: var(--paper);
}

.comparison > .container > p {
    color: var(--paper-soft);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.comparison-table {
    width: 100%;
    border-collapse: collapse;
    margin: 1.5rem 0;
    font-size: 0.95rem;
}

.comparison-table th {
    text-align: left;
    padding: 1rem;
    background-color: var(--ink-2);
    color: var(--accent);
    font-family: var(--font-mono);
    font-size: 0.78rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-weight: 500;
    border: 1px solid var(--line);
}

.comparison-table td {
    padding: 1rem;
    border: 1px solid var(--line);
    color: var(--paper-soft);
    vertical-align: top;
}

.comparison-table tr:nth-child(even) td {
    background-color: var(--ink-2);
}

/* Example Section */
.example {
    padding: 4rem 0;
}

.example h2 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    letter-spacing: -0.01em;
    margin-bottom: 1.5rem;
    color: var(--paper);
}

.example > .container > p {
    color: var(--paper-soft);
    margin-bottom: 1.5rem;
}

pre {
    background-color: var(--ink-2);
    border: 1px solid var(--line);
    border-radius: 2px;
    padding: 1.5rem;
    overflow-x: auto;
    margin: 1.5rem 0;
}

code {
    font-family: var(--font-mono);
    font-size: 0.9rem;
    line-height: 1.5;
    color: var(--paper);
}

.example-note {
    color: var(--muted);
    font-style: italic;
    margin-top: 1rem;
}

/* Credential Types Section */
.credential-types {
    padding: 4rem 0;
    background-color: var(--ink-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.credential-types h2 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
    color: var(--paper);
}

.credential-types > .container > p {
    color: var(--paper-soft);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.credential-list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}

.credential-type {
    padding: 1.75rem;
    background-color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 2px;
    position: relative;
    transition: background 0.4s, border-color 0.4s;
}

.credential-type:hover {
    background-color: var(--ink-2);
    border-color: var(--accent-dim);
}

.credential-type h3 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--paper);
}

.credential-icon {
    color: var(--accent);
    font-size: 1.5rem;
}

.credential-type p {
    color: var(--paper-soft);
    font-size: 0.95rem;
    line-height: 1.6;
}

.credential-type .status {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.25rem 0.6rem;
    border-radius: 2px;
    margin-top: 0.85rem;
    font-weight: 500;
}

.credential-type .status.core {
    background-color: var(--accent-dim);
    color: var(--accent);
}

.credential-type .status.standard {
    background-color: transparent;
    color: var(--accent);
    border: 1px solid var(--accent-dim);
}

/* Protocol Types Section (ZKA-only) */
.protocol-types {
    padding: 4rem 0;
    background-color: var(--ink-2);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
}

.protocol-types h2 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
    color: var(--paper);
}

.protocol-types > .container > p {
    color: var(--paper-soft);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.protocol-list {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 1.5rem;
}

.protocol-type {
    padding: 1.75rem;
    background-color: var(--ink);
    border: 1px solid var(--line);
    border-radius: 2px;
    position: relative;
    grid-column: span 2;
    transition: background 0.4s, border-color 0.4s;
}

.protocol-type:hover {
    background-color: var(--ink-2);
    border-color: var(--accent-dim);
}

/* Center the last two boxes on the second row */
.protocol-type:nth-child(4) {
    grid-column: 2 / 4;
}

.protocol-type:nth-child(5) {
    grid-column: 4 / 6;
}

.protocol-type h3 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.2rem;
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--paper);
}

.protocol-icon {
    color: var(--accent);
    font-size: 1.5rem;
}

.protocol-type p {
    color: var(--paper-soft);
    font-size: 0.95rem;
    line-height: 1.6;
}

.protocol-type .status {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    padding: 0.25rem 0.6rem;
    border-radius: 2px;
    margin-top: 0.85rem;
    font-weight: 500;
}

.protocol-type .status.primary {
    background-color: var(--accent-dim);
    color: var(--accent);
}

.protocol-type .status.future {
    background-color: transparent;
    color: var(--accent);
    border: 1px solid var(--accent-dim);
}

/* Architecture diagram wrapper (ZKA-only, inline SVG pipeline) */
.architecture-diagram {
    overflow-x: auto;
}

.pipeline-diagram {
    width: 100%;
    max-width: 900px;
    height: auto;
    display: block;
    margin: 0 auto;
    min-width: 640px;
}

.pipeline-diagram .p-tag {
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    fill: var(--accent);
}

.pipeline-diagram .p-name {
    font-family: var(--font-serif);
    font-weight: 600;
    font-size: 13px;
    fill: var(--paper);
}

.pipeline-diagram .p-sub {
    font-family: var(--font-serif);
    font-weight: 400;
    font-size: 11px;
    fill: var(--paper-soft);
}

.pipeline-diagram .p-arrow-label {
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    fill: var(--accent);
}

.diagram-notes {
    background-color: var(--ink-2);
    border-left: 2px solid var(--accent);
    color: var(--paper-soft);
}

.diagram-notes strong {
    color: var(--paper);
}

/* Getting Started Section */
.getting-started {
    padding: 4rem 0;
}

.getting-started h2 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    letter-spacing: -0.01em;
    margin-bottom: 2.5rem;
    text-align: center;
    color: var(--paper);
}

.start-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.start-item {
    padding: 2rem;
    background-color: var(--ink-2);
    border: 1px solid var(--line);
    border-radius: 2px;
    text-align: center;
    transition: border-color 0.4s;
}

.start-item:hover {
    border-color: var(--accent-dim);
}

.start-item h3 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 1.4rem;
    letter-spacing: -0.01em;
    margin-bottom: 1rem;
    color: var(--paper);
}

.start-item p {
    color: var(--paper-soft);
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.8rem 1.5rem;
    background-color: transparent;
    color: var(--paper);
    text-decoration: none;
    border: 1px solid var(--line);
    border-radius: 2px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-weight: 500;
    transition: border-color 0.35s, color 0.35s, background 0.35s;
}

.btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background-color: var(--accent-dim);
}

/* Use Cases Section */
.use-cases {
    padding: 4rem 0;
    background-color: var(--ink-2);
    border-top: 1px solid var(--line);
}

.use-cases h2 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    letter-spacing: -0.01em;
    margin-bottom: 2rem;
    color: var(--paper);
}

.use-case-list {
    list-style: none;
    max-width: 900px;
}

.use-case-list li {
    padding: 1rem 0;
    border-bottom: 1px solid var(--line);
    color: var(--paper-soft);
    line-height: 1.6;
}

.use-case-list li:last-child {
    border-bottom: none;
}

.use-case-list strong {
    color: var(--paper);
    font-weight: 600;
}

/* Architecture Section */
.architecture {
    padding: 4rem 0;
}

.architecture h2 {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: clamp(1.9rem, 4vw, 2.6rem);
    letter-spacing: -0.01em;
    margin-bottom: 1.5rem;
    color: var(--paper);
}

.stack-diagram {
    overflow-x: auto;
}

.stack-svg {
    width: 100%;
    max-width: 900px;
    height: auto;
    display: block;
    margin: 0 auto;
    min-width: 640px;
}

.stack-svg .l-tag {
    font-family: var(--font-mono);
    font-size: 10.5px;
    letter-spacing: 0.16em;
    fill: var(--accent);
}

.stack-svg .l-name {
    font-family: var(--font-serif);
    font-weight: 700;
    font-size: 18px;
    letter-spacing: -0.01em;
    fill: var(--paper);
}

.stack-svg .chip {
    font-family: var(--font-mono);
    font-size: 12.5px;
    fill: var(--paper-soft);
}

/* Footer */
.footer {
    padding: 3rem 0 2rem;
    text-align: center;
    color: var(--muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--line);
}

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

.footer a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s;
}

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

.footer-note {
    margin-top: 1.5rem;
    font-style: italic;
    color: var(--muted);
}

/* Responsive Design */
@media (max-width: 1024px) {
    .credential-list {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .protocol-type {
        grid-column: span 2;
    }

    .protocol-type:nth-child(4) {
        grid-column: span 2;
    }

    /* Center the 5th item on the last row */
    .protocol-type:nth-child(5) {
        grid-column: 2 / 4;
    }
}

@media (max-width: 768px) {
    .tagline {
        font-size: 1.2rem;
    }

    .description {
        font-size: 1rem;
    }

    .nav {
        gap: 1rem;
        flex-wrap: wrap;
    }

    .header .container {
        flex-direction: column;
        gap: 1rem;
    }

    .feature-grid,
    .start-grid {
        grid-template-columns: 1fr;
    }

    .credential-list {
        grid-template-columns: 1fr;
    }

    .protocol-list {
        grid-template-columns: 1fr;
    }

    .protocol-type,
    .protocol-type:nth-child(4),
    .protocol-type:nth-child(5) {
        grid-column: 1 / -1;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }

    .hero {
        padding: 3rem 0 2rem;
    }

    pre {
        padding: 1rem;
        font-size: 0.85rem;
    }
}

@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* Syntax Highlighting for Code Blocks */
code .string { color: #a5d6ff; }
code .number { color: #79c0ff; }
code .boolean { color: #79c0ff; }
code .null { color: #79c0ff; }
code .key { color: #7ee787; }
code .comment { color: #8b949e; }
code .keyword { color: #ff7b72; }