/* ============================================
   TensorPi — Dark theme, Prime Intellect-inspired
   ============================================ */

/* --- Self-hosted fonts (no Google Fonts dependency) --- */
@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400 800;
    font-display: swap;
    src: url('fonts/inter-latin.woff2') format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
    font-family: 'Inter';
    font-style: normal;
    font-weight: 400 800;
    font-display: swap;
    src: url('fonts/inter-latin-ext.woff2') format('woff2');
    unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 400 500;
    font-display: swap;
    src: url('fonts/jetbrainsmono-latin.woff2') format('woff2');
    unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

@font-face {
    font-family: 'JetBrains Mono';
    font-style: normal;
    font-weight: 400 500;
    font-display: swap;
    src: url('fonts/jetbrainsmono-latin-ext.woff2') format('woff2');
    unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}

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

:root {
    --bg-primary: #0a0a0a;
    --bg-secondary: #111111;
    --bg-card: #161616;
    --bg-card-hover: #1a1a1a;
    --border-color: #222222;
    --border-color-light: #333333;
    --text-primary: #f0f0f0;
    --text-secondary: rgba(240, 240, 240, 0.6);
    --text-muted: rgba(240, 240, 240, 0.4);
    --accent: #85ED75;
    --accent-dim: rgba(133, 237, 117, 0.15);
    --accent-hover: #6dd85e;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Cascadia Code', 'Fira Code', monospace;
    --max-width: 1200px;
    --nav-height: 64px;
}

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

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

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;
}

/* Remove Blazor enhanced nav focus outlines on headings/sections */
h1:focus, h2:focus, h3:focus, h4:focus,
section:focus, main:focus, [tabindex]:focus {
    outline: none;
}

/* Keep focus visible for interactive elements (accessibility) */
a:focus-visible, button:focus-visible, input:focus-visible,
select:focus-visible, textarea:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

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

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 6vw, 4rem); }
h2 { font-size: 2.25rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.125rem; }

.label {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--accent);
}

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

/* --- Layout --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    padding: 6rem 0;
    border-bottom: 1px solid var(--border-color);
}

.page-content {
    padding-top: var(--nav-height);
}

/* --- Navigation --- */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    align-items: center;
}

.nav .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-logo span { color: var(--accent); }

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
}

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

.nav-links a.nav-cta,
.nav-links a.nav-cta:hover {
    color: #0a0a0a;
}

.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: var(--accent);
    color: #0a0a0a;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.nav-cta:hover {
    background: var(--accent-hover);
    color: #0a0a0a;
    transform: translateY(-1px);
}

/* Nav dropdown */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-trigger::after {
    content: ' \25BE';
    font-size: 0.7em;
    opacity: 0.5;
}

.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    margin-top: 0.75rem;
    padding: 0.5rem 0;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    list-style: none;
    min-width: 180px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    z-index: 100;
}

.nav-dropdown-menu::before {
    content: '';
    position: absolute;
    top: -8px;
    left: 0;
    right: 0;
    height: 8px;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown.active .nav-dropdown-menu {
    display: block;
}

.nav-dropdown-menu li {
    list-style: none;
}

.nav-dropdown-menu a {
    display: block;
    padding: 0.5rem 1.25rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
    transition: background 0.15s, color 0.15s;
}

.nav-dropdown-menu a:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
}

@media (max-width: 768px) {
    .nav-toggle { display: block; }
    .nav-links {
        display: none;
        position: absolute;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 1.5rem 2rem;
        gap: 1rem;
    }
    .nav-links.open { display: flex; }

    .nav-dropdown-menu {
        position: static;
        transform: none;
        margin-top: 0.5rem;
        box-shadow: none;
        border: none;
        background: transparent;
        padding: 0 0 0 1rem;
        min-width: auto;
    }

    .nav-dropdown-menu::before { display: none; }

    .nav-dropdown-menu a {
        padding: 0.375rem 0;
    }
}

/* --- Hero --- */
.hero {
    padding-top: calc(var(--nav-height) + 6rem);
    padding-bottom: 6rem;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -200px;
    left: 50%;
    transform: translateX(-50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--accent-dim) 0%, transparent 70%);
    pointer-events: none;
}

.hero h1 {
    max-width: 800px;
    margin-bottom: 1.5rem;
    position: relative;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.hero-ctas {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* --- Buttons --- */
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    background: var(--accent);
    color: #0a0a0a;
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: 6px;
    border: none;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
}

.btn-primary:hover {
    background: var(--accent-hover);
    color: #0a0a0a;
    transform: translateY(-1px);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.75rem;
    background: transparent;
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 6px;
    border: 1px solid var(--border-color-light);
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.btn-secondary:hover {
    border-color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.03);
    color: var(--text-primary);
}

.btn-arrow::after {
    content: ' \2192';
    transition: transform 0.2s;
    display: inline-block;
}

.btn-arrow:hover::after {
    transform: translateX(4px);
}

/* --- Cards --- */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    transition: border-color 0.2s, background 0.2s;
}

.card:hover {
    border-color: var(--border-color-light);
    background: var(--bg-card-hover);
}

.card-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-dim);
    border-radius: 8px;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
}

.card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* --- Grids --- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; }

@media (max-width: 768px) {
    .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

/* --- Section Headers --- */
.section-header {
    margin-bottom: 3rem;
}

.section-header .label {
    margin-bottom: 0.75rem;
    display: block;
}

.section-header h2 { margin-bottom: 1rem; }

.section-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
    line-height: 1.7;
}

/* --- Numbered Sections --- */
.numbered-section {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
}

.section-number {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--accent);
    opacity: 0.6;
    flex-shrink: 0;
    padding-top: 0.25rem;
}

@media (max-width: 768px) {
    .numbered-section { flex-direction: column; gap: 1rem; }
}

/* --- Stats --- */
.stats-row {
    display: flex;
    gap: 3rem;
    flex-wrap: wrap;
}

.stat-value {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
}

/* --- Hardware Table --- */
.hw-table {
    width: 100%;
    border-collapse: collapse;
}

.hw-table th {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    text-align: left;
    padding: 0.75rem 1rem;
    border-bottom: 1px solid var(--border-color);
}

.hw-table td {
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9375rem;
}

.hw-table tr:hover td {
    background: rgba(255, 255, 255, 0.02);
}

.hw-badge {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
    border: 1px solid;
}

.hw-badge.nvidia { color: #76b900; border-color: rgba(118, 185, 0, 0.3); background: rgba(118, 185, 0, 0.08); }
.hw-badge.tenstorrent { color: #a78bfa; border-color: rgba(167, 139, 250, 0.3); background: rgba(167, 139, 250, 0.08); }
.hw-badge.hailo { color: #60a5fa; border-color: rgba(96, 165, 250, 0.3); background: rgba(96, 165, 250, 0.08); }
/* --- Vendor Logo Strip --- */
.vendor-logos {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
    padding: 1rem 0;
}

.vendor-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    opacity: 0.35;
    transition: opacity 0.25s ease;
    user-select: none;
    white-space: nowrap;
}

.vendor-logos:hover .vendor-logo {
    opacity: 0.2;
}

.vendor-logos:hover .vendor-logo:hover {
    opacity: 1;
}

.vendor-logos--clickable .vendor-logo {
    cursor: pointer;
}

.vendor-logo--nvidia { color: #76b900; }
.vendor-logo--tenstorrent { color: #a78bfa; letter-spacing: 0.12em; font-size: 1.0625rem; }
.vendor-logo--hailo { color: #60a5fa; text-transform: lowercase; font-style: italic; }
.vendor-logo--axelera { color: #34d399; letter-spacing: 0.1em; font-size: 1.0625rem; }
.vendor-logo--apple { color: #e2e2e2; font-family: var(--font-sans); letter-spacing: -0.02em; }
.vendor-logo--amd { color: #ed1c24; letter-spacing: 0.08em; }
.vendor-logo--deepx { color: #f472b6; letter-spacing: 0.08em; }
.vendor-logo--qant { color: #fbbf24; font-family: var(--font-sans); font-weight: 800; letter-spacing: -0.01em; }

@media (max-width: 768px) {
    .vendor-logos {
        gap: 1.5rem;
    }

    .vendor-logo {
        font-size: 1rem;
    }

    .vendor-logo--tenstorrent,
    .vendor-logo--axelera {
        font-size: 0.875rem;
    }
}

.hw-badge.axelera { color: #34d399; border-color: rgba(52, 211, 153, 0.3); background: rgba(52, 211, 153, 0.08); }
.hw-badge.apple { color: #e2e2e2; border-color: rgba(226, 226, 226, 0.3); background: rgba(226, 226, 226, 0.08); }
.hw-badge.qant { color: #fbbf24; border-color: rgba(251, 191, 36, 0.3); background: rgba(251, 191, 36, 0.08); }
.hw-badge.deepx { color: #f472b6; border-color: rgba(244, 114, 182, 0.3); background: rgba(244, 114, 182, 0.08); }
.hw-badge.amd { color: #ed1c24; border-color: rgba(237, 28, 36, 0.3); background: rgba(237, 28, 36, 0.08); }
.hw-badge.edge { color: #f59e0b; border-color: rgba(245, 158, 11, 0.3); background: rgba(245, 158, 11, 0.08); }

/* --- Blog --- */
.blog-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.blog-card {
    padding: 2rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: border-color 0.2s;
}

.blog-card:hover { border-color: var(--border-color-light); }

.blog-meta {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.blog-date {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.blog-tag {
    display: inline-block;
    padding: 0.15rem 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border-radius: 4px;
    border: 1px solid;
}

.tag-announcement { color: #f59e0b; border-color: rgba(245, 158, 11, 0.3); background: rgba(245, 158, 11, 0.08); }
.tag-news { color: #60a5fa; border-color: rgba(96, 165, 250, 0.3); background: rgba(96, 165, 250, 0.08); }
.tag-press-release { color: #e2e2e2; border-color: rgba(226, 226, 226, 0.3); background: rgba(226, 226, 226, 0.08); }
.tag-research { color: #a78bfa; border-color: rgba(167, 139, 250, 0.3); background: rgba(167, 139, 250, 0.08); }
.tag-guide { color: var(--accent); border-color: var(--accent-dim); background: var(--accent-dim); }

.blog-card h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
}

.blog-card h3 a { color: var(--text-primary); }
.blog-card h3 a:hover { color: var(--accent); }

.blog-card p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

/* --- Blog Post Content --- */
.blog-content h2 {
    margin-top: 2.5rem;
    margin-bottom: 1rem;
}

.blog-content h3 {
    margin-top: 2rem;
    margin-bottom: 0.75rem;
}

.blog-content p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 1.25rem;
}

.blog-content ul, .blog-content ol {
    color: var(--text-secondary);
    padding-left: 1.5rem;
    margin-bottom: 1.25rem;
    line-height: 1.8;
}

.blog-content li {
    margin-bottom: 0.5rem;
}

.blog-content code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    background: rgba(255, 255, 255, 0.06);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
}

.blog-content pre {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
    overflow-x: auto;
    margin-bottom: 1.5rem;
}

.blog-content pre code {
    background: none;
    padding: 0;
}

.blog-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1.25rem;
    margin: 1.5rem 0;
    color: var(--text-secondary);
    font-style: italic;
}

.blog-content strong {
    color: var(--text-primary);
}

.blog-content table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: 1.5rem;
}

.blog-content th {
    text-align: left;
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 600;
}

.blog-content td {
    padding: 0.75rem;
    border-bottom: 1px solid var(--border-color);
    font-size: 0.9375rem;
}

.blog-content img {
    border-radius: 8px;
    margin: 1.5rem 0;
}

/* --- Forms --- */
.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
}

.form-input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    transition: border-color 0.2s;
}

.form-input:focus {
    outline: none;
    border-color: var(--accent);
}

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

.form-input.invalid,
.form-input.modified.invalid {
    border-color: #DE3B3B;
}

.validation-message {
    color: #DE3B3B;
    font-size: 0.8125rem;
    margin-top: 0.25rem;
}

textarea.form-input {
    min-height: 150px;
    resize: vertical;
}

.newsletter-form {
    display: flex;
    gap: 0.75rem;
    max-width: 500px;
}

.newsletter-form .form-input { flex: 1; }

/* --- Footer --- */
.footer {
    padding: 4rem 0 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand p {
    color: var(--text-secondary);
    font-size: 0.875rem;
    max-width: 300px;
    margin-top: 0.75rem;
}

.footer-col h4 {
    font-size: 0.8125rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.footer-col ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-col a {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

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

.footer-bottom {
    padding-top: 2rem;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.8125rem;
    color: var(--text-muted);
}

@media (max-width: 768px) {
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 2rem; }
    .footer-bottom { flex-direction: column; gap: 1rem; }
}

/* --- Page Header (for inner pages) --- */
.page-header {
    padding-top: calc(var(--nav-height) + 4rem);
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--border-color);
    position: relative;
    overflow: hidden;
}

.page-header .container {
    position: relative;
    z-index: 1;
}

.page-header h1 {
    margin-bottom: 1rem;
}

.page-header p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    max-width: 600px;
}

.page-header-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.page-header-bg picture,
.page-header-bg img {
    display: block;
    width: 100%;
    height: 100%;
}

.page-header-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    opacity: 0.25;
    mask-image: linear-gradient(to bottom, black 30%, transparent 100%);
    -webkit-mask-image: linear-gradient(to bottom, black 30%, transparent 100%);
}

/* --- Accessibility --- */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.sr-only:focus {
    position: fixed;
    top: 0;
    left: 0;
    width: auto;
    height: auto;
    padding: 1rem 2rem;
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
    background: var(--accent);
    color: #0a0a0a;
    font-weight: 600;
    z-index: 10000;
}

/* --- Visual Backdrops --- */
.hero-backdrop {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
    z-index: 0;
}

.hero-backdrop::before {
    content: '';
    position: absolute;
    top: -30%;
    right: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--accent-dim) 0%, transparent 60%);
    filter: blur(80px);
}

.hero-backdrop::after {
    content: '';
    position: absolute;
    bottom: -20%;
    left: -5%;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(167, 139, 250, 0.08) 0%, transparent 60%);
    filter: blur(60px);
}

/* Grid pattern overlay */
.grid-bg {
    position: relative;
}

.grid-bg::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(133, 237, 117, 0.15) 1px, transparent 1px),
        linear-gradient(90deg, rgba(133, 237, 117, 0.15) 1px, transparent 1px);
    background-size: 60px 60px;
    opacity: 0.5;
    pointer-events: none;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 65%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 65%);
}

/* Glow accent for sections */
.glow-top {
    position: relative;
}

.glow-top::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 500px;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0.4;
}

/* Dot pattern for cards */
.dot-pattern {
    position: relative;
    overflow: hidden;
}

/* --- Hardware Tier Cards --- */
.tier-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    overflow: hidden;
    transition: border-color 0.3s;
}

.tier-card:hover {
    border-color: var(--border-color-light);
}

.tier-card-visual {
    position: relative;
    height: 260px;
    overflow: hidden;
    background: var(--bg-primary);
}

.tier-card-visual picture,
.tier-card-visual img {
    width: 100%;
    height: 100%;
    display: block;
}

.tier-card-visual img {
    object-fit: cover;
    object-position: center;
}

.tier-card-body {
    padding: 2rem;
}

.tier-card-body h3 {
    font-size: 1.375rem;
    margin-bottom: 0.75rem;
}

.tier-card-body > p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

.tier-card-specs {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.tier-card-specs .spec {
    display: flex;
    flex-direction: column;
}

.tier-card-specs .spec-value {
    font-family: var(--font-mono);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--accent);
}

.tier-card-specs .spec-label {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: 0.125rem;
}

.tier-card-vendors {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.tier-card-vendors span:first-child {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-right: 0.25rem;
}

.tier-vendor-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.tier-vendor {
    padding: 1.25rem;
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.tier-vendor h4 {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    font-size: 0.9375rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.tier-vendor p {
    color: var(--text-secondary);
    font-size: 0.8125rem;
    line-height: 1.6;
    margin-bottom: 0.75rem;
}

.tier-products {
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
}

.tier-products span {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    color: var(--text-secondary);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

@media (max-width: 768px) {
    .tier-vendor-details {
        grid-template-columns: 1fr;
    }
}

.dot-pattern::after {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 120px;
    height: 120px;
    background-image: radial-gradient(circle, var(--border-color-light) 1px, transparent 1px);
    background-size: 12px 12px;
    opacity: 0.5;
    pointer-events: none;
}