/* ==========================================================================
   rahmany2k.com — Rahman MD · AI engineering notes
   Plain CSS, no build step. Dark by default, light on request.
   ========================================================================== */

:root {
  --bg: #0a0d12;
  --bg-2: #0e1218;
  --panel: #121822;
  --panel-2: #161d29;
  --line: #1d2633;
  --line-strong: #2a3647;
  --text: #e9eef4;
  --muted: #9aa8b8;
  --dim: #66748a;
  --accent: #f2b544;
  --accent-2: #f27d5c;
  --accent-ink: #1a1206;
  --accent-soft: rgba(242, 181, 68, 0.14);
  --ok: #6fd3a7;
  --shadow: 0 20px 50px -30px rgba(0, 0, 0, 0.8);
  --maxw: 1100px;
  --measure: 68ch;
  --radius: 16px;
  --radius-sm: 10px;
  --font-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-serif: "Instrument Serif", Georgia, "Times New Roman", serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #fbf9f4;
  --bg-2: #f4f0e7;
  --panel: #ffffff;
  --panel-2: #f7f3ea;
  --line: #e6e0d3;
  --line-strong: #d4ccbb;
  --text: #15191f;
  --muted: #4d5968;
  --dim: #7b8695;
  --accent: #b5750a;
  --accent-2: #cf5438;
  --accent-ink: #ffffff;
  --accent-soft: rgba(181, 117, 10, 0.12);
  --ok: #1d8a5c;
  --shadow: 0 20px 50px -30px rgba(40, 30, 10, 0.35);
  color-scheme: light;
}

/* --------------------------------------------------------------------------
   Base
   -------------------------------------------------------------------------- */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 400 17px/1.65 var(--font-sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  position: relative;
}

/* Subtle dot grid behind everything. */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background-image: radial-gradient(var(--line) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.45;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 70%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 70%);
}

a {
  color: inherit;
  text-decoration: none;
}

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

img,
svg {
  display: block;
  max-width: 100%;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 6px;
}

.portfolio-wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.portfolio-skip-link {
  position: absolute;
  left: 16px;
  top: -60px;
  z-index: 100;
  padding: 10px 16px;
  background: var(--accent);
  color: var(--accent-ink);
  border-radius: var(--radius-sm);
  font-weight: 600;
}

.portfolio-skip-link:focus {
  top: 12px;
}

.portfolio-visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --------------------------------------------------------------------------
   Type
   -------------------------------------------------------------------------- */

.portfolio-serif {
  font-family: var(--font-serif);
  font-weight: 400;
  letter-spacing: -0.015em;
}

.portfolio-mono {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.portfolio-grad {
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.portfolio-kicker {
  margin: 0 0 12px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.portfolio-section-title {
  margin: 0 0 16px;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2rem, 4.4vw, 2.9rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
}

.portfolio-section-title em {
  font-style: italic;
  color: var(--accent);
}

.portfolio-intro {
  margin: 0;
  max-width: var(--measure);
  color: var(--muted);
  font-size: 1.08rem;
}

.portfolio-intro strong {
  color: var(--text);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   Header / navigation
   -------------------------------------------------------------------------- */

.portfolio-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  border-bottom: 1px solid var(--line);
}

.portfolio-nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  height: 64px;
}

.portfolio-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  letter-spacing: -0.01em;
  flex: none;
}

.portfolio-brand:hover {
  color: var(--text);
}

.portfolio-brand-mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.portfolio-brand-sub {
  color: var(--dim);
  font-weight: 500;
}

.portfolio-nav-right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.portfolio-navigation {
  display: flex;
  align-items: center;
  gap: 4px;
}

.portfolio-navigation a {
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 500;
}

.portfolio-navigation a:hover,
.portfolio-navigation a[aria-current="page"] {
  color: var(--text);
  background: var(--panel);
}

.portfolio-nav-cta {
  margin-left: 6px;
  border: 1px solid var(--line-strong);
}

.portfolio-nav-cta:hover {
  border-color: var(--accent);
  color: var(--accent) !important;
}

.portfolio-icon-button {
  display: inline-grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: var(--panel);
  color: var(--muted);
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, transform 0.15s;
}

.portfolio-icon-button:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.portfolio-icon-button svg {
  width: 18px;
  height: 18px;
}

.portfolio-theme-toggle .portfolio-icon-sun {
  display: none;
}

:root[data-theme="light"] .portfolio-theme-toggle .portfolio-icon-sun {
  display: block;
}

:root[data-theme="light"] .portfolio-theme-toggle .portfolio-icon-moon {
  display: none;
}

.portfolio-nav-toggle {
  display: none;
}

@media (max-width: 760px) {
  .portfolio-nav-toggle {
    display: inline-grid;
  }

  .portfolio-navigation {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    padding: 10px 16px 16px;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.18s, transform 0.18s, visibility 0.18s;
  }

  .portfolio-navigation[data-open="true"] {
    transform: none;
    opacity: 1;
    visibility: visible;
  }

  .portfolio-navigation a {
    padding: 12px 14px;
    font-size: 1.02rem;
  }

  .portfolio-nav-cta {
    margin: 6px 0 0;
    text-align: center;
  }

  .portfolio-brand-sub {
    display: none;
  }
}

/* --------------------------------------------------------------------------
   Buttons, badges, pills
   -------------------------------------------------------------------------- */

.portfolio-button {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 22px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s, background 0.15s, border-color 0.15s, color 0.15s;
}

.portfolio-button svg {
  width: 16px;
  height: 16px;
}

.portfolio-button-primary {
  background: var(--accent);
  color: var(--accent-ink);
}

.portfolio-button-primary:hover {
  color: var(--accent-ink);
  transform: translateY(-1px);
  filter: brightness(1.06);
}

.portfolio-button-secondary {
  border-color: var(--line-strong);
  color: var(--text);
  background: transparent;
}

.portfolio-button-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.portfolio-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-top: 30px;
  padding: 8px 14px 8px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 0.86rem;
}

.portfolio-badge b {
  color: var(--text);
  font-weight: 600;
}

.portfolio-pulse {
  position: relative;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ok);
  flex: none;
}

.portfolio-pulse::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 2px solid var(--ok);
  opacity: 0.6;
  animation: portfolio-pulse 1.8s ease-out infinite;
}

@keyframes portfolio-pulse {
  from {
    transform: scale(0.6);
    opacity: 0.7;
  }

  to {
    transform: scale(1.6);
    opacity: 0;
  }
}

.portfolio-tag {
  display: inline-block;
  padding: 5px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--bg-2);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.portfolio-tag-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.portfolio-hero {
  position: relative;
  padding: 88px 0 72px;
  overflow: hidden;
}

.portfolio-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -10%;
  width: 55vw;
  height: 55vw;
  max-width: 760px;
  max-height: 760px;
  background: radial-gradient(circle, rgba(242, 181, 68, 0.16), transparent 62%);
  pointer-events: none;
}

.portfolio-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 48px;
  align-items: center;
}

.portfolio-eyebrow {
  margin: 0 0 18px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.portfolio-title {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2.7rem, 6.6vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
}

.portfolio-title em {
  font-style: italic;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.portfolio-tagline {
  margin: 0 0 20px;
  max-width: 34ch;
  font-size: clamp(1.15rem, 2.6vw, 1.5rem);
  font-weight: 500;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.portfolio-motto {
  margin: 0 0 22px;
  color: var(--text);
  font-family: var(--font-serif);
  font-style: italic;
  font-size: 1.3rem;
}

.portfolio-lede {
  margin: 0 0 30px;
  max-width: 58ch;
  color: var(--muted);
  font-size: 1.1rem;
}

.portfolio-lede strong {
  color: var(--text);
  font-weight: 600;
}

.portfolio-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* Latest-note card in the hero. */
.portfolio-hero-card {
  position: relative;
  display: block;
  padding: 26px 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--panel), var(--panel-2));
  box-shadow: var(--shadow);
  transition: transform 0.2s, border-color 0.2s;
}

.portfolio-hero-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  color: inherit;
}

.portfolio-hero-card-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
  color: var(--accent-2);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.portfolio-hero-card-label span:last-child {
  color: var(--dim);
}

.portfolio-hero-card h2 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.7rem;
  line-height: 1.15;
  letter-spacing: -0.015em;
}

.portfolio-hero-card p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 0.98rem;
}

.portfolio-hero-card-trace {
  display: grid;
  gap: 6px;
  margin: 0 0 18px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--muted);
}

.portfolio-hero-card-trace span {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.portfolio-hero-card-trace b {
  color: var(--text);
  font-weight: 500;
}

.portfolio-hero-card-trace i {
  color: var(--ok);
  font-style: normal;
  text-align: right;
}

.portfolio-text-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
}

.portfolio-text-link:hover {
  gap: 10px;
}

@media (max-width: 900px) {
  .portfolio-hero-grid {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .portfolio-hero {
    padding: 64px 0 56px;
  }
}

/* --------------------------------------------------------------------------
   Sections & cards
   -------------------------------------------------------------------------- */

.portfolio-section {
  padding: 72px 0;
  border-top: 1px solid var(--line);
}

.portfolio-surface {
  background: var(--bg-2);
}

.portfolio-section-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.portfolio-section-head .portfolio-intro {
  margin-top: 8px;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.portfolio-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  transition: transform 0.2s, border-color 0.2s;
}

.portfolio-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
}

.portfolio-card-no {
  margin-bottom: 14px;
  color: var(--accent-2);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.portfolio-card h3 {
  margin: 0 0 8px;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
  line-height: 1.3;
}

.portfolio-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.97rem;
}

.portfolio-card-foot {
  margin-top: auto;
  padding-top: 18px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* Post cards */
.portfolio-post-card {
  display: flex;
  flex-direction: column;
  padding: 26px 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: inherit;
  transition: transform 0.2s, border-color 0.2s;
}

.portfolio-post-card:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  color: inherit;
}

.portfolio-post-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  margin-bottom: 14px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.portfolio-post-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.5rem;
  line-height: 1.2;
  letter-spacing: -0.015em;
}

.portfolio-post-card:hover h3 {
  color: var(--accent);
}

.portfolio-post-card p {
  margin: 0 0 18px;
  color: var(--muted);
  font-size: 0.97rem;
}

.portfolio-post-card .portfolio-tag-row {
  margin-top: auto;
}

/* Featured post */
.portfolio-feature {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 32px;
  margin-bottom: 18px;
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: linear-gradient(135deg, var(--panel), var(--panel-2));
  overflow: hidden;
  color: inherit;
  transition: transform 0.2s, border-color 0.2s;
}

.portfolio-feature::after {
  content: "";
  position: absolute;
  right: -15%;
  bottom: -70%;
  width: 55%;
  height: 140%;
  background: radial-gradient(circle, rgba(242, 125, 92, 0.16), transparent 60%);
  pointer-events: none;
}

.portfolio-feature:hover {
  transform: translateY(-3px);
  border-color: var(--accent);
  color: inherit;
}

.portfolio-feature h3 {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(1.7rem, 3.4vw, 2.3rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.portfolio-feature:hover h3 {
  color: var(--accent);
}

.portfolio-feature p {
  margin: 0 0 20px;
  max-width: 60ch;
  color: var(--muted);
  font-size: 1.04rem;
}

.portfolio-feature-side {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 10px;
  padding-left: 32px;
  border-left: 1px solid var(--line);
}

.portfolio-feature-side h4 {
  margin: 0 0 4px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.portfolio-feature-side ul {
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.95rem;
}

.portfolio-feature-side li {
  position: relative;
  padding: 7px 0 7px 22px;
  border-bottom: 1px solid var(--line);
}

.portfolio-feature-side li:last-child {
  border-bottom: 0;
}

.portfolio-feature-side li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--accent);
}

@media (max-width: 820px) {
  .portfolio-feature {
    grid-template-columns: 1fr;
    padding: 28px 24px;
  }

  .portfolio-feature-side {
    padding-left: 0;
    padding-top: 22px;
    border-left: 0;
    border-top: 1px solid var(--line);
  }
}

/* --------------------------------------------------------------------------
   Principles banner
   -------------------------------------------------------------------------- */

.portfolio-punch {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(120% 140% at 85% 0%, rgba(242, 181, 68, 0.12), transparent 55%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
}

.portfolio-punch-head {
  max-width: 760px;
  margin: 0 auto 44px;
  text-align: center;
}

.portfolio-punch-head .portfolio-kicker {
  text-align: center;
}

.portfolio-punch-head .portfolio-section-title {
  font-size: clamp(2rem, 4.8vw, 3.2rem);
}

.portfolio-punch-head p {
  margin: 0 auto;
  max-width: 54ch;
  color: var(--muted);
  font-size: 1.1rem;
}

.portfolio-principles {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: principle;
}

.portfolio-principles li {
  counter-increment: principle;
  position: relative;
  padding: 22px 22px 22px 70px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.portfolio-principles li::before {
  content: "0" counter(principle);
  position: absolute;
  left: 22px;
  top: 22px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
}

.portfolio-principles h3 {
  margin: 0 0 6px;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
}

.portfolio-principles p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   About
   -------------------------------------------------------------------------- */

.portfolio-about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
  gap: 48px;
  align-items: start;
}

.portfolio-about p {
  margin: 0 0 18px;
  max-width: var(--measure);
  color: var(--muted);
  font-size: 1.06rem;
}

.portfolio-about p strong {
  color: var(--text);
  font-weight: 600;
}

.portfolio-aside {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.portfolio-aside h3 {
  margin: 0 0 14px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.portfolio-aside ul {
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.95rem;
}

.portfolio-aside li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.portfolio-aside li:last-child {
  border-bottom: 0;
}

.portfolio-aside li b {
  color: var(--text);
  font-weight: 500;
}

.portfolio-aside li span {
  color: var(--dim);
  text-align: right;
}

@media (max-width: 860px) {
  .portfolio-about-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
}

/* --------------------------------------------------------------------------
   Contact
   -------------------------------------------------------------------------- */

.portfolio-contact {
  text-align: center;
}

.portfolio-contact .portfolio-kicker,
.portfolio-contact .portfolio-intro {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.portfolio-contact .portfolio-cta {
  justify-content: center;
  margin: 30px 0 18px;
}

.portfolio-contact-note {
  margin: 0 auto 28px;
  max-width: 50ch;
  color: var(--dim);
  font-size: 0.92rem;
}

.portfolio-contact-note a {
  color: var(--muted);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
}

.portfolio-contact-note a:hover {
  color: var(--accent);
}

.portfolio-social {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.portfolio-social a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  transition: border-color 0.15s, color 0.15s, transform 0.15s;
}

.portfolio-social a:hover {
  color: var(--accent);
  border-color: var(--accent);
  transform: translateY(-1px);
}

.portfolio-social svg {
  width: 16px;
  height: 16px;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.portfolio-footer {
  padding: 34px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--dim);
  font-size: 0.9rem;
}

.portfolio-footer .portfolio-wrap {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 14px;
}

.portfolio-footer b {
  color: var(--muted);
  font-weight: 600;
}

.portfolio-footer .portfolio-social {
  justify-content: flex-start;
}

.portfolio-footer .portfolio-social a {
  padding: 7px 12px;
  font-size: 0.82rem;
}

.portfolio-back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 30;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
}

.portfolio-back-to-top[data-visible="true"] {
  opacity: 1;
  visibility: visible;
  transform: none;
}

/* --------------------------------------------------------------------------
   Blog index
   -------------------------------------------------------------------------- */

.portfolio-page-head {
  padding: 72px 0 40px;
}

.portfolio-page-head .portfolio-title {
  font-size: clamp(2.4rem, 5.6vw, 3.8rem);
}

.portfolio-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 28px;
}

.portfolio-filter button {
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--muted);
  font: 500 0.82rem/1 var(--font-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.portfolio-filter button:hover {
  color: var(--text);
  border-color: var(--line-strong);
}

.portfolio-filter button[aria-pressed="true"] {
  color: var(--accent-ink);
  background: var(--accent);
  border-color: var(--accent);
}

.portfolio-post-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 18px;
}

.portfolio-post-list [hidden] {
  display: none;
}

.portfolio-empty {
  margin: 0;
  padding: 36px;
  border: 1px dashed var(--line-strong);
  border-radius: var(--radius);
  color: var(--dim);
  text-align: center;
}

/* --------------------------------------------------------------------------
   Article
   -------------------------------------------------------------------------- */

.portfolio-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 50;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  transition: width 0.1s linear;
}

.portfolio-article-head {
  padding: 64px 0 44px;
  border-bottom: 1px solid var(--line);
}

.portfolio-breadcrumb {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

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

.portfolio-article-title {
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: clamp(2.3rem, 5.6vw, 3.9rem);
  line-height: 1.05;
  letter-spacing: -0.025em;
}

.portfolio-article-dek {
  margin: 0 0 26px;
  max-width: 60ch;
  color: var(--muted);
  font-size: 1.22rem;
  line-height: 1.5;
}

.portfolio-article-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.portfolio-article-meta .portfolio-author-mini {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--text);
}

.portfolio-article-meta .portfolio-author-mini::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
}

.portfolio-article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 56px;
  padding: 48px 0 72px;
}

.portfolio-article-body {
  max-width: var(--measure);
  font-size: 1.1rem;
  line-height: 1.75;
}

.portfolio-article-body > * + * {
  margin-top: 1.25em;
}

.portfolio-article-body h2 {
  margin-top: 2.3em;
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 2rem;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

.portfolio-article-body h3 {
  margin-top: 1.8em;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.portfolio-article-body p {
  margin-bottom: 0;
}

.portfolio-article-body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: color-mix(in srgb, var(--accent) 40%, transparent);
  text-underline-offset: 3px;
}

.portfolio-article-body a:hover {
  text-decoration-color: var(--accent);
}

.portfolio-article-body strong {
  color: var(--text);
  font-weight: 600;
}

.portfolio-article-body ul,
.portfolio-article-body ol {
  padding-left: 1.3em;
}

.portfolio-article-body li + li {
  margin-top: 0.45em;
}

.portfolio-article-body li::marker {
  color: var(--accent);
}

.portfolio-article-body blockquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 22px;
  border-left: 2px solid var(--accent);
  color: var(--text);
  font-family: var(--font-serif);
  font-size: 1.45rem;
  line-height: 1.35;
  letter-spacing: -0.01em;
}

.portfolio-article-body code {
  padding: 2px 7px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--panel);
  font-family: var(--font-mono);
  font-size: 0.86em;
}

.portfolio-article-body pre {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--panel);
  overflow-x: auto;
  font-size: 0.86rem;
  line-height: 1.6;
}

.portfolio-article-body pre code {
  padding: 0;
  border: 0;
  background: none;
  font-size: inherit;
}

.portfolio-article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.96rem;
}

.portfolio-article-body th,
.portfolio-article-body td {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.portfolio-article-body th {
  color: var(--dim);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.portfolio-article-body hr {
  margin: 2.4em 0;
  border: 0;
  border-top: 1px solid var(--line);
}

.portfolio-callout {
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--panel);
}

.portfolio-callout h3,
.portfolio-callout h2 {
  margin: 0 0 12px;
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.portfolio-callout ul,
.portfolio-callout ol {
  margin: 0;
}

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

.portfolio-timeline {
  margin: 1.6em 0 !important;
  padding: 0 !important;
  list-style: none;
}

.portfolio-timeline li {
  position: relative;
  display: grid;
  grid-template-columns: 90px minmax(0, 1fr);
  gap: 18px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  margin: 0 !important;
}

.portfolio-timeline li:last-child {
  border-bottom: 0;
}

.portfolio-timeline time {
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding-top: 4px;
}

.portfolio-timeline p {
  margin: 0 !important;
  font-size: 1rem;
}

.portfolio-timeline b {
  color: var(--text);
}

.portfolio-sources {
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.92rem;
}

.portfolio-sources h2 {
  margin: 0 0 14px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.portfolio-sources ol {
  margin: 0;
  padding-left: 1.3em;
}

.portfolio-sources li + li {
  margin-top: 6px;
}

.portfolio-sources a {
  color: var(--muted);
  text-decoration: underline;
  text-decoration-color: var(--line-strong);
  text-underline-offset: 3px;
}

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

/* Sidebar */
.portfolio-article-side {
  position: sticky;
  top: 90px;
  align-self: start;
  display: grid;
  gap: 18px;
}

.portfolio-side-block {
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.portfolio-side-block h3 {
  margin: 0 0 12px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.portfolio-toc {
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.9rem;
}

.portfolio-toc li + li {
  margin-top: 6px;
}

.portfolio-toc a {
  display: block;
  color: var(--muted);
  padding-left: 12px;
  border-left: 1px solid var(--line);
}

.portfolio-toc a:hover,
.portfolio-toc a[aria-current="true"] {
  color: var(--text);
  border-left-color: var(--accent);
}

.portfolio-side-block p {
  margin: 0 0 14px;
  color: var(--muted);
  font-size: 0.92rem;
}

.portfolio-side-block .portfolio-button {
  width: 100%;
  justify-content: center;
}

@media (max-width: 960px) {
  .portfolio-article-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }

  .portfolio-article-side {
    position: static;
  }

  .portfolio-toc-block {
    display: none;
  }
}

/* Prev / next */
.portfolio-pagination {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 14px;
  margin-top: 48px;
}

.portfolio-pagination a {
  display: block;
  padding: 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  color: inherit;
  transition: border-color 0.15s, transform 0.15s;
}

.portfolio-pagination a:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
  color: inherit;
}

.portfolio-pagination a.portfolio-next {
  text-align: right;
}

.portfolio-pagination small {
  display: block;
  margin-bottom: 6px;
  color: var(--dim);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.portfolio-pagination strong {
  font-family: var(--font-serif);
  font-weight: 400;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}

/* Author card */
.portfolio-author {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 20px;
  align-items: center;
  margin-top: 48px;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--panel), var(--panel-2));
}

.portfolio-author-mark {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: var(--accent-ink);
  font-family: var(--font-serif);
  font-size: 1.5rem;
}

.portfolio-author h3 {
  margin: 0 0 4px;
  font-size: 1.1rem;
}

.portfolio-author p {
  margin: 0 0 12px;
  color: var(--muted);
  font-size: 0.95rem;
}

.portfolio-author .portfolio-cta {
  gap: 8px;
}

.portfolio-author .portfolio-button {
  padding: 10px 16px;
  font-size: 0.88rem;
}

@media (max-width: 560px) {
  .portfolio-author {
    grid-template-columns: 1fr;
  }
}

/* --------------------------------------------------------------------------
   Motion
   -------------------------------------------------------------------------- */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media print {
  .portfolio-header,
  .portfolio-footer,
  .portfolio-back-to-top,
  .portfolio-progress,
  .portfolio-article-side,
  .portfolio-pagination,
  .portfolio-author {
    display: none !important;
  }

  body {
    background: #fff;
    color: #000;
  }
}