/* ================================
   Base Variables & Reset
   ================================ */
:root {
    --color-bg: #fafaf9;
    --color-bg-secondary: #f5f5f4;
    --color-text: #292524;
    --color-text-secondary: #78716c;
    --color-text-muted: #a8a29e;
    --color-accent: #1d4ed8;
    --color-accent-light: #3b82f6;
    --color-border: #e7e5e4;
    --color-card-bg: #ffffff;

    --font-serif: 'Noto Serif SC', 'Songti SC', serif;
    --font-sans: 'Noto Sans SC', 'PingFang SC', sans-serif;

    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08);
}

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

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

body {
    font-family: var(--font-sans);
    font-weight: 400;
    line-height: 1.8;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ================================
   Typography
   ================================ */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-text);
}

h1 { font-size: 2.25rem; margin-bottom: var(--space-lg); }
h2 { font-size: 1.5rem; margin-bottom: var(--space-md); }
h3 { font-size: 1.25rem; margin-bottom: var(--space-sm); }

p {
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

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

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

/* ================================
   Header
   ================================ */
.site-header {
    background: var(--color-card-bg);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.logo-text {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

.site-logo:hover .logo-text {
    color: var(--color-accent);
}

.site-nav {
    display: flex;
    gap: var(--space-lg);
}

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--space-xs) 0;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-accent);
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-link:hover::after {
    width: 100%;
}

/* ================================
   Main Content
   ================================ */
.site-main {
    flex: 1;
    padding: var(--space-3xl) var(--space-lg);
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
}

/* ================================
   Long-form technical articles
   ================================ */
.technical-article {
    overflow-wrap: anywhere;
}

.technical-article h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    letter-spacing: -0.035em;
}

.technical-article h2 {
    margin-top: var(--space-3xl);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.technical-article h3 {
    margin-top: var(--space-xl);
}

.technical-article ul,
.technical-article ol {
    margin: 0 0 var(--space-lg) var(--space-xl);
}

.technical-article li + li {
    margin-top: var(--space-xs);
}

.technical-article blockquote {
    margin: var(--space-lg) 0;
    padding: var(--space-md) var(--space-lg);
    border-left: 4px solid var(--color-accent);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    background: var(--color-bg-secondary);
}

.technical-article blockquote p:last-child {
    margin-bottom: 0;
}

.technical-article code {
    padding: 0.1em 0.35em;
    border-radius: var(--radius-sm);
    background: #eef2ff;
    color: #3730a3;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.9em;
}

.technical-article pre {
    margin: var(--space-lg) 0;
    padding: var(--space-lg);
    overflow-x: auto;
    border: 1px solid #292524;
    border-radius: var(--radius-md);
    background: #1c1917;
    color: #f5f5f4;
    line-height: 1.65;
}

.technical-article pre code {
    padding: 0;
    background: transparent;
    color: inherit;
    font-size: 0.875rem;
}

.technical-article table {
    display: block;
    width: 100%;
    margin: var(--space-lg) 0 var(--space-xl);
    overflow-x: auto;
    border-spacing: 0;
    border-collapse: collapse;
    font-size: 0.9rem;
}

.technical-article th,
.technical-article td {
    min-width: 9rem;
    padding: 0.75rem;
    border: 1px solid var(--color-border);
    text-align: left;
    vertical-align: top;
}

.technical-article th {
    background: var(--color-bg-secondary);
    font-weight: 600;
}

/* ================================
   Linker-address article
   ================================ */
.linker-article {
    max-width: 1040px;
}

.linker-article > h1 {
    margin-bottom: var(--space-lg);
    padding: clamp(2rem, 6vw, 4rem);
    border-radius: var(--radius-lg);
    background:
        radial-gradient(circle at 88% 18%, rgba(251, 191, 36, 0.22), transparent 28%),
        linear-gradient(135deg, #111827, #1e293b 58%, #334155);
    box-shadow: var(--shadow-lg);
    color: #f8fafc;
}

.linker-article > h1::before {
    content: "ELF MEMORY MAP · QUICK GUIDE";
    display: block;
    margin-bottom: 0.75rem;
    color: #fbbf24;
    font-family: var(--font-sans);
    font-size: 0.72rem;
    letter-spacing: 0.14em;
}

.linker-article h2,
.linker-article h3 {
    scroll-margin-top: 6rem;
}

.address-rule {
    display: grid;
    gap: 0.35rem;
    margin: var(--space-xl) 0;
    padding: var(--space-lg);
    border: 1px solid #f59e0b;
    border-left-width: 5px;
    border-radius: var(--radius-lg);
    background: #fffbeb;
}

.address-rule strong {
    color: #92400e;
    font-size: 0.8rem;
    letter-spacing: 0.08em;
}

.address-rule span {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-weight: 600;
}

.callout {
    margin: var(--space-xl) 0;
    padding: var(--space-lg);
    border: 1px solid #cbd5e1;
    border-left-width: 5px;
    border-radius: var(--radius-lg);
    background: #f8fafc;
}

.callout strong {
    display: block;
    margin-bottom: var(--space-sm);
}

.callout p:last-child {
    margin-bottom: 0;
}

.callout--danger {
    border-left-color: #dc2626;
    background: #fef2f2;
}

.callout--key {
    border-left-color: #2563eb;
    background: #eff6ff;
}

.callout--warn {
    border-left-color: #d97706;
    background: #fffbeb;
}

@media (max-width: 640px) {
    .linker-article > h1 {
        padding: 1.5rem;
    }
}

.audit-note {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: var(--space-md);
    margin: var(--space-xl) 0;
    padding: var(--space-lg);
    border: 1px solid #bfdbfe;
    border-radius: var(--radius-lg);
    background: #eff6ff;
}

.audit-note strong {
    color: #1d4ed8;
}

.arch-view-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-md);
    margin: var(--space-xl) 0;
}

.arch-view {
    padding: var(--space-md);
    border: 1px solid var(--color-border);
    border-top: 4px solid #94a3b8;
    border-radius: var(--radius-lg);
    background: var(--color-card-bg);
    box-shadow: var(--shadow-sm);
}

.arch-view--supported {
    border-top-color: #16a34a;
}

.arch-view--missing {
    border-top-color: #f59e0b;
}

.arch-view__heading {
    display: flex;
    justify-content: space-between;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.arch-view__heading span {
    color: var(--color-text-secondary);
    font-size: 0.78rem;
}

.arch-view__root,
.arch-view__empty {
    padding: 0.65rem 0.75rem;
    border: 1px solid #bfdbfe;
    border-radius: var(--radius-md);
    background: #eff6ff;
    font-size: 0.88rem;
}

.arch-view__root--kernel {
    border-color: #ddd6fe;
    background: #f5f3ff;
}

.arch-view__root small,
.arch-view__empty small {
    display: block;
    color: var(--color-text-secondary);
}

.arch-view__switch {
    padding: var(--space-xs) 0;
    color: var(--color-text-secondary);
    text-align: center;
    font-size: 0.78rem;
}

.kpti-flow {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr) auto minmax(0, 1fr);
    align-items: stretch;
    gap: var(--space-sm);
    margin: var(--space-xl) 0;
}

.kpti-flow__state {
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 10rem;
    padding: var(--space-lg);
    border-radius: var(--radius-lg);
    text-align: center;
}

.kpti-flow__state--user {
    border: 1px solid #bfdbfe;
    background: #eff6ff;
}

.kpti-flow__state--gate {
    border: 1px solid #fde68a;
    background: #fffbeb;
}

.kpti-flow__state--kernel {
    border: 1px solid #ddd6fe;
    background: #f5f3ff;
}

.kpti-flow__eyebrow {
    margin-bottom: var(--space-xs);
    color: var(--color-text-secondary);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.kpti-flow__state small {
    margin-top: var(--space-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.kpti-flow__edge {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 6rem;
    color: var(--color-text-muted);
    text-align: center;
    font-size: 0.7rem;
    line-height: 1.4;
}

.kpti-flow__edge b {
    color: var(--color-accent);
    font-size: 1.5rem;
}

.kpti-flow figcaption {
    grid-column: 1 / -1;
    margin-top: var(--space-sm);
    color: var(--color-text-secondary);
    text-align: center;
    font-size: 0.82rem;
}

.switch-flow {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin: var(--space-lg) 0;
    padding: var(--space-md);
    overflow-x: auto;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-bg-secondary);
}

.switch-flow span {
    flex: 1 0 10rem;
    padding: var(--space-sm);
    border-radius: var(--radius-md);
    background: var(--color-card-bg);
    text-align: center;
}

.switch-flow small {
    display: block;
    margin-top: var(--space-xs);
    color: var(--color-text-secondary);
}

.switch-flow b {
    color: var(--color-accent);
}

/* ================================
   KPTI article presentation
   ================================ */
.kpti-article {
    --kpti-ink: #172033;
    --kpti-blue: #2563eb;
    --kpti-violet: #7c3aed;
    --kpti-amber: #d97706;
    --kpti-teal: #0f766e;
    max-width: 1080px;
    color: var(--kpti-ink);
}

.kpti-article > h1 {
    position: relative;
    margin: 0 0 var(--space-lg);
    padding: clamp(2rem, 6vw, 4.5rem) clamp(1.25rem, 5vw, 4rem);
    overflow: hidden;
    border: 1px solid #1e3a5f;
    border-radius: 1.25rem;
    background:
        radial-gradient(circle at 88% 12%, rgba(96, 165, 250, 0.26), transparent 28%),
        linear-gradient(135deg, #0f172a 0%, #172554 55%, #1e3a8a 100%);
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.16);
    color: #f8fafc;
    font-size: clamp(2.15rem, 5vw, 3.65rem);
    line-height: 1.15;
    text-wrap: balance;
}

.kpti-article > h1::before {
    content: "KERNEL PAGE-TABLE ISOLATION";
    display: block;
    margin-bottom: 0.8rem;
    color: #93c5fd;
    font-family: var(--font-sans);
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.16em;
}

.kpti-article > h1::after {
    content: "CR3  ·  TTBR1  ·  satp";
    display: block;
    margin-top: 1.25rem;
    color: #bfdbfe;
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
    font-size: 0.78rem;
    font-weight: 400;
    letter-spacing: 0.06em;
}

.kpti-article > h1 + blockquote {
    margin: 0 0 var(--space-xl);
    padding: 1rem 1.25rem;
    border: 1px solid #cbd5e1;
    border-left: 4px solid #475569;
    border-radius: var(--radius-lg);
    background: #f8fafc;
    box-shadow: var(--shadow-sm);
    color: #475569;
    font-size: 0.86rem;
    line-height: 1.75;
}

.kpti-article > h1 + blockquote p {
    margin: 0;
    color: inherit;
}

.kpti-article .audit-note {
    position: relative;
    grid-template-columns: 7rem 1fr;
    align-items: start;
    margin: var(--space-xl) 0;
    padding: 1.25rem 1.4rem;
    overflow: hidden;
    border-color: #a7f3d0;
    background: linear-gradient(110deg, #ecfdf5, #f0fdfa);
    box-shadow: var(--shadow-sm);
}

.kpti-article .audit-note::after {
    content: "✓";
    position: absolute;
    right: 1rem;
    bottom: -1.7rem;
    color: rgba(5, 150, 105, 0.08);
    font-size: 7rem;
    font-weight: 700;
    line-height: 1;
}

.kpti-article .audit-note strong {
    position: relative;
    z-index: 1;
    color: #047857;
    font-size: 0.82rem;
    letter-spacing: 0.08em;
}

.kpti-article .audit-note span {
    position: relative;
    z-index: 1;
    line-height: 1.8;
}

.article-map {
    display: grid;
    grid-template-columns: minmax(12rem, 0.8fr) minmax(0, 2.2fr);
    align-items: center;
    gap: var(--space-lg);
    margin: var(--space-xl) 0 var(--space-2xl);
    padding: 1rem 1.2rem;
    border: 1px solid #dbeafe;
    border-radius: var(--radius-lg);
    background: #ffffff;
    box-shadow: var(--shadow-sm);
}

.article-map__intro {
    display: flex;
    flex-direction: column;
    padding-right: var(--space-lg);
    border-right: 1px solid #e2e8f0;
}

.article-map__intro span {
    color: var(--kpti-blue);
    font-size: 0.68rem;
    font-weight: 600;
    letter-spacing: 0.12em;
}

.article-map__intro strong {
    margin-top: 0.15rem;
    color: var(--kpti-ink);
    font-family: var(--font-serif);
}

.article-map__links {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0.45rem;
}

.article-map__links a {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    padding: 0.48rem 0.6rem;
    border-radius: 0.45rem;
    color: #475569;
    font-size: 0.82rem;
    font-weight: 500;
}

.article-map__links a:hover {
    background: #eff6ff;
    color: var(--kpti-blue);
}

.article-map__links b {
    color: #94a3b8;
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
    font-size: 0.68rem;
}

.kpti-article h2,
.kpti-article h3 {
    scroll-margin-top: 6rem;
}

.kpti-article h2 {
    position: relative;
    margin-top: 4.75rem;
    padding: 0.75rem 1rem 0.8rem 1.15rem;
    border: 0;
    border-left: 5px solid #64748b;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    background: linear-gradient(90deg, #f1f5f9, rgba(248, 250, 252, 0));
    color: var(--kpti-ink);
    font-size: clamp(1.4rem, 3vw, 1.8rem);
    text-wrap: balance;
}

.kpti-article h2#architecture-x86 {
    border-left-color: var(--kpti-blue);
    background: linear-gradient(90deg, #eff6ff, rgba(239, 246, 255, 0));
}

.kpti-article h2#architecture-arm64 {
    border-left-color: var(--kpti-violet);
    background: linear-gradient(90deg, #f5f3ff, rgba(245, 243, 255, 0));
}

.kpti-article h2#architecture-riscv {
    border-left-color: var(--kpti-amber);
    background: linear-gradient(90deg, #fffbeb, rgba(255, 251, 235, 0));
}

.kpti-article h2#comparison,
.kpti-article h2#evidence {
    border-left-color: var(--kpti-teal);
    background: linear-gradient(90deg, #f0fdfa, rgba(240, 253, 250, 0));
}

.kpti-article h3 {
    padding-left: 0.8rem;
    border-left: 3px solid #cbd5e1;
    color: #334155;
    font-size: 1.18rem;
}

.kpti-article h3#fail-stop {
    margin-top: var(--space-2xl);
    padding: 1rem 1.15rem;
    border: 1px solid #bfdbfe;
    border-left: 5px solid var(--kpti-blue);
    border-radius: var(--radius-md);
    background: linear-gradient(100deg, #eff6ff, #f8fafc);
    color: #1e3a8a;
}

.kpti-article > p,
.kpti-article > ul,
.kpti-article > ol {
    max-width: 82ch;
}

.kpti-article > p {
    line-height: 1.9;
}

.kpti-article strong {
    color: #172554;
}

.kpti-article a {
    text-decoration-color: #bfdbfe;
    text-decoration-line: underline;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.16em;
}

.kpti-article .article-map__links a,
.kpti-article .failstop-summary__heading a {
    text-decoration: none;
}

.kpti-article pre {
    border-color: #334155;
    background: linear-gradient(145deg, #0f172a, #1e293b);
    box-shadow: 0 10px 28px rgba(15, 23, 42, 0.12);
}

.kpti-article table {
    border: 1px solid #dbe3ee;
    border-radius: var(--radius-lg);
    background: #ffffff;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
    scrollbar-color: #94a3b8 #f1f5f9;
    scrollbar-width: thin;
}

.kpti-article th,
.kpti-article td {
    border-color: #e2e8f0;
    line-height: 1.65;
}

.kpti-article th {
    background: #eef2f7;
    color: #1e293b;
    font-size: 0.8rem;
    letter-spacing: 0.02em;
}

.kpti-article tbody tr:nth-child(even) td {
    background: #f8fafc;
}

.kpti-article tbody tr:hover td {
    background: #eff6ff;
}

.kpti-article th:first-child,
.kpti-article td:first-child {
    position: sticky;
    left: 0;
    z-index: 1;
    box-shadow: 1px 0 0 #e2e8f0;
}

.kpti-article td:first-child {
    background: #ffffff;
    font-weight: 600;
}

.kpti-article tbody tr:nth-child(even) td:first-child {
    background: #f8fafc;
}

.kpti-article tbody tr:hover td:first-child {
    background: #eff6ff;
}

.kpti-article .arch-view {
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.kpti-article .arch-view:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.kpti-article .kpti-flow,
.kpti-article .switch-flow {
    padding: var(--space-lg);
    border: 1px solid #dbe3ee;
    border-radius: 1rem;
    background: #ffffff;
    box-shadow: 0 8px 24px rgba(15, 23, 42, 0.06);
}

.failstop-summary {
    display: grid;
    grid-template-columns: 1.15fr repeat(3, minmax(0, 1fr));
    gap: 0.75rem;
    margin: var(--space-2xl) 0;
    padding: 0.8rem;
    border: 1px solid #cbd5e1;
    border-radius: 1rem;
    background: #0f172a;
    box-shadow: 0 16px 38px rgba(15, 23, 42, 0.14);
}

.failstop-summary__heading,
.failstop-card {
    display: flex;
    flex-direction: column;
    min-height: 9.5rem;
    padding: 1rem;
    border-radius: var(--radius-md);
}

.failstop-summary__heading {
    justify-content: center;
    color: #f8fafc;
}

.failstop-summary__heading span,
.failstop-card__arch {
    margin-bottom: 0.45rem;
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.failstop-summary__heading span {
    color: #60a5fa;
}

.failstop-summary__heading strong {
    color: #f8fafc;
    font-family: var(--font-serif);
    line-height: 1.5;
}

.failstop-summary__heading a {
    align-self: flex-start;
    margin-top: 0.75rem;
    color: #93c5fd;
    font-size: 0.75rem;
    text-decoration: none;
}

.failstop-card {
    justify-content: space-between;
    border: 1px solid transparent;
    background: #ffffff;
}

.failstop-card strong {
    color: #172033;
    font-size: 1rem;
}

.failstop-card small {
    color: #64748b;
    font-size: 0.76rem;
    line-height: 1.55;
}

.failstop-card--safe {
    border-color: #86efac;
    background: #f0fdf4;
}

.failstop-card--safe .failstop-card__arch {
    color: #15803d;
}

.failstop-card--risk {
    border-color: #fda4af;
    background: #fff1f2;
}

.failstop-card--risk .failstop-card__arch {
    color: #be123c;
}

.failstop-card--future {
    border-color: #fcd34d;
    background: #fffbeb;
}

.failstop-card--future .failstop-card__arch {
    color: #b45309;
}

.kpti-article #sources ~ ol {
    max-width: none;
    padding: 1.25rem 1.25rem 1.25rem 2.8rem;
    columns: 2 22rem;
    column-gap: 2.5rem;
    border: 1px solid #e2e8f0;
    border-radius: var(--radius-lg);
    background: #f8fafc;
    font-size: 0.86rem;
}

.kpti-article #sources ~ ol li {
    break-inside: avoid;
    margin: 0 0 0.75rem;
    padding-right: 0.5rem;
}

/* ================================
   Cards & Sections
   ================================ */
.card {
    background: var(--color-card-bg);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
    margin-bottom: var(--space-lg);
    transition: box-shadow 0.3s ease, transform 0.3s ease;
}

.card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
}

.section-title {
    font-family: var(--font-serif);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.section-title::before {
    content: '';
    display: block;
    width: 3px;
    height: 1.2em;
    background: var(--color-accent);
    border-radius: 2px;
}

/* ================================
   Hero Section
   ================================ */
.hero {
    text-align: center;
    padding: var(--space-3xl) 0;
}

.hero-title {
    font-size: 2.75rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    background: linear-gradient(135deg, var(--color-text) 0%, var(--color-accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    font-weight: 300;
}

.hero-tags {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

.tag {
    background: var(--color-bg-secondary);
    color: var(--color-text-secondary);
    padding: var(--space-xs) var(--space-md);
    border-radius: 999px;
    font-size: 0.875rem;
    font-weight: 500;
}

/* ================================
   About Section
   ================================ */
.about-intro {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.9;
    margin-bottom: var(--space-xl);
}

/* ================================
   Skills
   ================================ */
.skill-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    list-style: none;
}

.skill-item {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, var(--color-bg) 100%);
    border: 1px solid var(--color-border);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}

.skill-item::before {
    content: '▹';
    color: var(--color-accent);
}

/* ================================
   Timeline
   ================================ */
.timeline {
    position: relative;
    padding-left: var(--space-xl);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-xl);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--space-xl) - 5px);
    top: 8px;
    width: 12px;
    height: 12px;
    background: var(--color-card-bg);
    border: 2px solid var(--color-accent);
    border-radius: 50%;
}

.timeline-date {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-xs);
}

.timeline-title {
    font-weight: 600;
    margin-bottom: var(--space-xs);
}

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

/* ================================
   Contact
   ================================ */
.contact-list {
    list-style: none;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
}

.contact-item:last-child {
    border-bottom: none;
}

.contact-icon {
    width: 40px;
    height: 40px;
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
}

.contact-label {
    font-weight: 500;
    margin-bottom: var(--space-xs);
}

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

/* ================================
   Footer
   ================================ */
.site-footer {
    background: var(--color-card-bg);
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl) var(--space-lg);
    margin-top: auto;
}

.footer-inner {
    max-width: 900px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-text {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    margin: 0;
}

.footer-links {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.footer-link {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
    transition: color 0.2s ease;
}

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

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

/* ================================
   Utility Classes
   ================================ */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-xl { margin-top: var(--space-xl); }
.mb-xl { margin-bottom: var(--space-xl); }

/* ================================
   Responsive Design
   ================================ */
@media (max-width: 768px) {
    html {
        font-size: 15px;
    }

    .header-inner {
        padding: var(--space-md);
    }

    .site-nav {
        gap: var(--space-md);
    }

    .site-main {
        padding: var(--space-xl) var(--space-md);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.0625rem;
    }

    .card {
        padding: var(--space-lg);
    }

    .footer-inner {
        flex-direction: column;
        text-align: center;
    }

    .timeline {
        padding-left: var(--space-lg);
    }

    .technical-article h2 {
        margin-top: var(--space-2xl);
    }

    .arch-view-grid {
        grid-template-columns: 1fr;
    }

    .kpti-flow {
        grid-template-columns: 1fr;
    }

    .kpti-flow__state {
        min-height: auto;
    }

    .kpti-flow__edge {
        width: auto;
        min-height: 4rem;
    }

    .kpti-flow__edge b {
        transform: rotate(90deg);
    }

    .kpti-flow figcaption {
        grid-column: 1;
    }

    .kpti-article > h1 {
        padding: 2.25rem 1.35rem;
        border-radius: var(--radius-lg);
    }

    .article-map {
        grid-template-columns: 1fr;
        gap: 0.8rem;
    }

    .article-map__intro {
        padding: 0 0 0.8rem;
        border-right: 0;
        border-bottom: 1px solid #e2e8f0;
    }

    .failstop-summary {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .failstop-summary__heading,
    .failstop-card {
        min-height: 8.5rem;
    }

    .kpti-article h2 {
        margin-top: 3.5rem;
    }

    .kpti-article th,
    .kpti-article td {
        min-width: 8rem;
        padding: 0.68rem;
    }

    .kpti-article #sources ~ ol {
        columns: 1;
    }
}

@media (max-width: 480px) {
    .site-header {
        position: relative;
    }

    .header-inner {
        flex-direction: column;
        gap: var(--space-md);
    }

    .hero {
        padding: var(--space-xl) 0;
    }

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

    .audit-note {
        grid-template-columns: 1fr;
    }

    .kpti-article .audit-note {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

    .article-map__links {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .failstop-summary {
        grid-template-columns: 1fr;
    }

    .failstop-summary__heading,
    .failstop-card {
        min-height: auto;
    }

    .failstop-card {
        gap: 0.55rem;
    }

    .kpti-article .kpti-flow,
    .kpti-article .switch-flow {
        padding: var(--space-md);
    }
}