/* ============================================================
   Portfolio — Mazdak Shakiba
   Design system: Swiss-modernist. Strict grid. Monochrome.
   One grotesk + one mono. Light & dark themes.
   ============================================================ */

/* ---- Tokens: Light ---- */
:root,
[data-theme="light"] {
  --bg:           #ffffff;
  --bg-2:         #fafafa;
  --bg-3:         #f4f4f4;
  --fg:           #0a0a0a;     /* 19.4:1 on bg — AAA */
  --fg-2:         #4a4a4a;     /* 9.4:1  on bg — AAA */
  --fg-3:         #6b6b6b;     /* 5.2:1  on bg — AA body */
  --fg-4:         #8a8a8a;     /* 3.95:1 on bg — AA large + UI */
  --rule:         #e8e8e8;
  --rule-2:       #d4d4d4;
  --rule-strong:  #0a0a0a;
  --signal:       oklch(58% 0.16 145);   /* tiny green dot for status only */
  --hi:           #fff200;               /* highlighter, very sparing */

  --font-sans:    "Inter Tight", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-mono:    "Geist Mono", "JetBrains Mono", ui-monospace, Menlo, monospace;

  --gutter:       clamp(20px, 4vw, 56px);
  --maxw:         1440px;
  --col-gap:      24px;

  color-scheme: light;
}

/* ---- Tokens: Dark ---- */
[data-theme="dark"] {
  --bg:           #0a0a0a;
  --bg-2:         #0f0f0f;
  --bg-3:         #161616;
  --fg:           #f5f5f5;     /* 17:1 on bg — AAA */
  --fg-2:         #b5b5b5;     /* 10:1 on bg — AAA */
  --fg-3:         #a8a8a8;     /* 8.2:1 on bg — AAA body */
  --fg-4:         #7a7a7a;     /* 4.4:1 on bg — AA large + UI */
  --rule:         #1f1f1f;
  --rule-2:       #2a2a2a;
  --rule-strong:  #f5f5f5;
  --signal:       oklch(72% 0.18 145);

  color-scheme: dark;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  font-feature-settings: "ss01", "cv11", "tnum";
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 240ms ease, color 240ms ease;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }

::selection { background: var(--fg); color: var(--bg); }

h1, h2, h3, h4 { margin: 0; font-weight: 500; letter-spacing: -0.02em; }
p { margin: 0; text-wrap: pretty; }

/* ============================================================
   Type scale
   ============================================================ */
.t-display {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(48px, 7.4vw, 116px);
  line-height: 0.94;
  letter-spacing: -0.035em;
}
.t-h1 {
  font-size: clamp(40px, 5.4vw, 76px);
  line-height: 1.0;
  letter-spacing: -0.03em;
  font-weight: 500;
}
.t-h2 {
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 500;
}
.t-h3 {
  font-size: clamp(20px, 2vw, 26px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  font-weight: 500;
}
.t-lede {
  font-size: clamp(18px, 1.6vw, 22px);
  line-height: 1.45;
  letter-spacing: -0.012em;
  color: var(--fg);
  font-weight: 400;
}
.t-body { font-size: 15px; line-height: 1.55; color: var(--fg-2); }
.t-body strong { color: var(--fg); font-weight: 500; }

.mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-3);
  font-weight: 400;
}
.mono-sm { font-size: 10px; letter-spacing: 0.06em; }

.muted { color: var(--fg-3); }
.fg { color: var(--fg); }

/* ============================================================
   Layout
   ============================================================ */
.wrap {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--col-gap);
}

.hr { border: 0; border-top: 1px solid var(--rule); margin: 0; }
.hr-strong { border: 0; border-top: 1px solid var(--rule-strong); margin: 0; }

/* ============================================================
   Nav (top bar)
   ============================================================ */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in oklab, var(--bg) 85%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--rule);
}
.nav-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 32px;
  height: 64px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--gutter);
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  cursor: pointer;
}
.brand-mark {
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--fg);
}
.brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--fg-3);
}

.nav-links {
  display: flex;
  gap: 28px;
  justify-content: center;
  align-items: center;
}
.nav-link {
  font-size: 13px;
  color: var(--fg-2);
  cursor: pointer;
  padding: 4px 0;
  position: relative;
  transition: color 120ms;
}
.nav-link:hover { color: var(--fg); }
.nav-link.active { color: var(--fg); }
.nav-link.active::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -2px;
  height: 1px;
  background: var(--fg);
}
@media (max-width: 900px) {
  .nav-links { display: none; }
}

.nav-right { display: flex; align-items: center; gap: 16px; }

.theme-toggle {
  width: 36px; height: 36px;
  border: 1px solid var(--rule-2);
  background: transparent;
  cursor: pointer;
  display: grid; place-items: center;
  color: var(--fg);
  transition: border-color 120ms, background 120ms;
  border-radius: 999px;
}
.theme-toggle:hover { border-color: var(--fg); }
.theme-toggle svg { width: 16px; height: 16px; }

.nav-cta {
  font-size: 12.5px;
  padding: 8px 16px;
  border: 1px solid var(--fg);
  background: var(--fg);
  color: var(--bg);
  cursor: pointer;
  transition: background 120ms, color 120ms;
  border-radius: 999px;
}
.nav-cta:hover { background: transparent; color: var(--fg); }
@media (max-width: 640px) { .nav-cta { display: none; } }

/* ============================================================
   Section structure
   ============================================================ */
.section {
  padding: clamp(52px, 9vh, 120px) 0;
}
.section.no-border { border-top: 0; }
.section.tight { padding: clamp(48px, 6vh, 80px) 0; }

.section-header {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin-bottom: 48px;
}
.section-id {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.section-id .num { color: var(--fg); font-weight: 500; }
.section-id .bar {
  flex: 1; height: 1px;
  background: var(--rule);
  margin-left: 8px;
  max-width: 200px;
}

.section-title-row {
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  gap: 64px;
  align-items: end;
  margin-top: 12px;
}
@media (max-width: 760px) {
  .section-title-row { grid-template-columns: 1fr; gap: 24px; }
}
.section-title { color: var(--fg); }
.section-aside {
  font-size: 14px;
  line-height: 1.55;
  color: var(--fg-3);
  max-width: 42ch;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding: clamp(80px, 14vh, 160px) 0 clamp(64px, 10vh, 120px);
}
.hero-eyebrow {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-bottom: 56px;
  flex-wrap: wrap;
}
.hero-eyebrow .dash { color: var(--fg-4); }
.hero-eyebrow .dot {
  width: 7px; height: 7px; border-radius: 999px;
  background: var(--signal);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--signal) 22%, transparent);
  display: inline-block;
}
.hero-statement {
  max-width: 22ch;
  margin-bottom: 64px;
  color: var(--fg-3);
}
.hero-statement .accent { color: var(--fg); }

.hero-meta-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  column-gap: 32px;
  row-gap: 24px;
  border-top: 1px solid var(--rule-strong);
  padding-top: 28px;
}
.hero-meta {
  flex: 0 0 auto;
  min-width: 0;
}
/* the long value absorbs the leftover width and wraps, so the gaps stay equal */
.hero-meta--grow {
  flex: 0 1 auto;
}
@media (max-width: 900px) {
  .hero-meta-grid { justify-content: flex-start; column-gap: var(--col-gap); }
  .hero-meta, .hero-meta--grow { flex: 1 1 calc(50% - var(--col-gap)); }
}
@media (max-width: 560px) {
  .hero-meta, .hero-meta--grow { flex: 1 1 100%; }
}
.hero-meta .k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 10px;
  display: block;
}
.hero-meta .v {
  font-size: 15px;
  color: var(--fg);
  line-height: 1.4;
}
.hero-meta .v a {
  border-bottom: 1px solid var(--rule-2);
  padding-bottom: 1px;
}
.hero-meta .v a:hover { border-color: var(--fg); }

/* ============================================================
   Work — case cards
   ============================================================ */
.work-list {
  border-top: 1px solid var(--rule-strong);
}
.work-row {
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 5fr) minmax(0, 3fr) auto;
  gap: 32px;
  padding: 36px 0;
  border-bottom: 1px solid var(--rule);
  align-items: start;
}
@media (max-width: 900px) {
  .work-row {
    grid-template-columns: 1fr;
    gap: 16px 20px;
  }
}

.work-row .col-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--fg-3);
  padding-top: 14px;
}
.work-row .col-head {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.work-row .work-title {
  font-size: clamp(28px, 3.4vw, 42px);
  line-height: 1.02;
  letter-spacing: -0.025em;
  font-weight: 500;
  color: var(--fg);
}
.work-row .work-domain {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.work-row .col-summary {
  font-size: 15px;
  line-height: 1.5;
  color: var(--fg-2);
  max-width: 50ch;
}
.work-row .col-meta {
  display: grid;
  gap: 6px;
  font-size: 12.5px;
  color: var(--fg-3);
}
.work-row .col-meta .meta-row { display: grid; grid-template-columns: 80px 1fr; gap: 12px; }
.work-row .col-meta .meta-row .k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.work-row .col-meta .meta-row .v { color: var(--fg); font-family: var(--font-sans); font-size: 13px; }

.work-row .col-cta { display: flex; align-items: flex-start; }

.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--fg);
  background: transparent;
  color: var(--fg);
  padding: 10px 18px;
  font-size: 12.5px;
  font-weight: 500;
  letter-spacing: -0.005em;
  cursor: pointer;
  transition: background 120ms, color 120ms, border-color 120ms;
  font-family: inherit;
  white-space: nowrap;
  border-radius: 999px;
}
.cta-btn:hover { background: var(--fg); color: var(--bg); }
.cta-btn .arrow { font-family: var(--font-mono); font-size: 14px; }

.cta-btn.subtle {
  border-color: var(--rule-2);
  color: var(--fg-2);
}
.cta-btn.subtle:hover { border-color: var(--fg); color: var(--fg); background: transparent; }

.cta-btn.solid { background: var(--fg); color: var(--bg); }
.cta-btn.solid:hover { background: transparent; color: var(--fg); }

/* ============================================================
   Approach (three columns, numbered)
   ============================================================ */
.approach-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule-strong);
}
@media (max-width: 860px) { .approach-grid { grid-template-columns: 1fr; } }
.approach-col {
  padding: 32px 28px 32px 0;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.approach-col:last-child { border-right: 0; padding-right: 0; }
@media (max-width: 860px) {
  .approach-col { border-right: 0; padding-right: 0; }
}
.approach-col .step {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--fg-3);
  margin-bottom: 24px;
}
.approach-col .step .num { color: var(--fg); font-weight: 500; }
.approach-col h3 { margin-bottom: 14px; }
.approach-col p {
  font-size: 14px;
  line-height: 1.6;
  color: var(--fg-2);
  max-width: 38ch;
}

/* ============================================================
   Experience timeline
   ============================================================ */
.tl {
  border-top: 1px solid var(--rule-strong);
  display: grid;
  grid-template-columns: 140px minmax(0, 1.4fr) minmax(0, 2fr) auto;
  column-gap: 32px;
}
.tl-row {
  display: grid;
  grid-template-columns: subgrid;
  grid-column: 1 / -1;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
@media (max-width: 760px) {
  .tl { display: block; }
  .tl-row { display: grid; grid-template-columns: 1fr; gap: 6px; }
}
.tl-row .y {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--fg-3);
}
.tl-row .co {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--fg);
}
.tl-row .ro {
  font-size: 14px;
  color: var(--fg-2);
  line-height: 1.45;
}
.tl-row .loc {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--fg-3);
  text-transform: uppercase;
  text-align: right;
}
@media (max-width: 760px) { .tl-row .loc { text-align: left; } }

/* Experience expand/contract actions */
.tl-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

/* ============================================================
   Honors & Awards
   ============================================================ */
.honors-list {
  border-top: 1px solid var(--rule-strong);
  display: grid;
  grid-template-columns: 90px minmax(0, 2fr) minmax(0, 1fr) minmax(0, 1.4fr);
  column-gap: 32px;
}
.honor-row {
  display: grid;
  grid-template-columns: subgrid;
  grid-column: 1 / -1;
  padding: 22px 0;
  border-bottom: 1px solid var(--rule);
  align-items: baseline;
}
.honor-row .y {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.04em;
  color: var(--fg-3);
}
.honor-row .t {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--fg);
}
.honor-row .c,
.honor-row .o {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--fg-3);
  text-transform: uppercase;
}
.honor-row .o {
  text-align: right;
}
@media (max-width: 760px) {
  .honors-list { display: block; }
  .honor-row { display: grid; grid-template-columns: 1fr; gap: 6px; }
  .honor-row .o { text-align: left; }
}

/* About interests strip */
.about-interests {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 24px;
  align-items: baseline;
}
.about-interests .k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.about-interests .v {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.about-interests .v span {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--rule-2);
  border-radius: 999px;
  font-size: 13px;
  color: var(--fg-2);
}
@media (max-width: 640px) {
  .about-interests { grid-template-columns: 1fr; gap: 12px; }
}

/* ============================================================
   Publications
   ============================================================ */
.pub-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule-strong);
}
@media (max-width: 760px) { .pub-grid { grid-template-columns: 1fr; } }
.pub-card {
  padding: 28px 28px 28px 0;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  display: grid;
  gap: 14px;
  cursor: pointer;
  transition: padding-left 200ms, background 120ms;
}
.pub-card:nth-child(2n) { border-right: 0; padding-right: 0; padding-left: 28px; }
@media (max-width: 760px) {
  .pub-card,
  .pub-card:nth-child(2n) { border-right: 0; padding-left: 0; padding-right: 0; }
}
.pub-card:hover { padding-left: 12px; }
.pub-card:nth-child(2n):hover { padding-left: 40px; }
.pub-card .pub-meta {
  display: flex;
  gap: 14px;
  align-items: baseline;
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.pub-card .pub-meta .dot { color: var(--fg-4); }
.pub-card .pub-title {
  font-size: 20px;
  line-height: 1.25;
  letter-spacing: -0.018em;
  font-weight: 500;
  color: var(--fg);
}
.pub-card .pub-desc {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--fg-2);
  max-width: 52ch;
}
.pub-card .pub-arrow {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--fg-3);
}

/* ============================================================
   About
   ============================================================ */
.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 64px;
  border-top: 1px solid var(--rule-strong);
  padding-top: 36px;
  align-items: stretch;
}
@media (max-width: 860px) { .about-grid { grid-template-columns: 1fr; gap: 24px; } }
.about-aside {
  display: flex;
  align-self: stretch;
  min-height: 0;
}
.about-photo {
  width: auto;
  height: 273px;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  display: block;
  border-radius: 50%;
}
.about-body {
  font-size: 16px;
  line-height: 1.65;
  color: var(--fg);
  max-width: 62ch;
}
.about-body p { margin: 0 0 1.1em; }
.about-body p:last-child { margin-bottom: 0; }
.about-body strong { font-weight: 500; }

/* ============================================================
   Resume CTA block
   ============================================================ */
.resume-block {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 64px;
  border-top: 1px solid var(--rule-strong);
  padding-top: 36px;
}
@media (max-width: 860px) { .resume-block { grid-template-columns: 1fr; gap: 24px; } }
.resume-block .label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.resume-block .body {
  display: grid;
  gap: 28px;
}
.resume-block .links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ============================================================
   Philosophy (manifesto)
   ============================================================ */
.philosophy {
  padding: clamp(60px, 12vh, 140px) 0;
  background: var(--bg-2);
}
.philosophy-eyebrow {
  display: flex;
  align-items: baseline;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 48px;
}
.philosophy-eyebrow .num { color: var(--fg); font-weight: 500; }
.philosophy-statement {
  font-size: clamp(34px, 4.4vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.025em;
  font-weight: 500;
  max-width: 22ch;
  color: var(--fg);
  margin-bottom: 64px;
}
.philosophy-statement .muted-2 { color: var(--fg-3); }
.philosophy-tenets {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  border-top: 1px solid var(--rule-strong);
}
@media (max-width: 860px) { .philosophy-tenets { grid-template-columns: 1fr 1fr; } }
@media (max-width: 560px) { .philosophy-tenets { grid-template-columns: 1fr; } }
.tenet {
  padding: 28px 24px 28px 0;
  border-bottom: 1px solid var(--rule);
}
.tenet .n {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--fg-3);
  margin-bottom: 16px;
}
.tenet .n strong { color: var(--fg); font-weight: 500; }
.tenet .h {
  font-size: 18px;
  line-height: 1.2;
  letter-spacing: -0.018em;
  font-weight: 500;
  margin-bottom: 10px;
  color: var(--fg);
}
.tenet .p {
  font-size: 13.5px;
  line-height: 1.55;
  color: var(--fg-2);
  max-width: 32ch;
}

/* ============================================================
   Contact / Footer
   ============================================================ */
.contact {
  padding: clamp(60px, 12vh, 140px) 0 64px;
}
.contact-eyebrow {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 32px;
  display: flex;
  align-items: baseline;
  gap: 14px;
}
.contact-eyebrow .num { color: var(--fg); font-weight: 500; }
.contact h2 {
  font-size: clamp(40px, 6vw, 88px);
  line-height: 1;
  letter-spacing: -0.03em;
  font-weight: 500;
  max-width: 18ch;
  margin-bottom: 56px;
}
.contact h2 .muted-2 { color: var(--fg-3); }
.contact .email-line {
  font-size: clamp(20px, 2.2vw, 28px);
  font-weight: 400;
  letter-spacing: -0.018em;
  color: var(--fg);
  margin-bottom: 64px;
}
.contact .email-line a {
  border-bottom: 1px solid var(--fg);
  padding-bottom: 4px;
}
.contact .email-line a:hover { color: var(--fg-3); border-color: var(--fg-3); }

.contact-lede {
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.55;
  color: var(--fg-2);
  max-width: 60ch;
  margin: 0 0 40px;
}

.contact-channels {
  display: flex;
  flex-wrap: wrap;
  gap: 28px;
  border-top: 1px solid var(--rule);
  padding-top: 28px;
}
.contact-channels .channel {
  font-size: 14px;
  color: var(--fg-2);
  border-bottom: 1px solid var(--rule-2);
  padding-bottom: 1px;
  transition: color 120ms, border-color 120ms;
}
.contact-channels .channel:hover { color: var(--fg); border-color: var(--fg); }

.contact-foot {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 72px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
}

/* ============================================================
   Animations
   ============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 600ms ease, transform 600ms ease;
}
.fade-in.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   Case Study — editorial layout w/ sticky TOC
   Smart Coach standalone structure, portfolio design language.
   ============================================================ */
.cs-main { }

.cs-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 220px;
  gap: 80px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: clamp(40px, 6vh, 72px) var(--gutter) 80px;
  align-items: start;
  justify-content: space-between;
}
@media (max-width: 980px) {
  .cs-layout { grid-template-columns: 1fr; gap: 0; }
}

.cs-content {
  min-width: 0;
  width: 100%;
}

/* ---------- Back link (inline in eyebrow) ---------- */
.cs-back {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
  cursor: pointer;
  margin-right: 12px;
  transition: color 0.15s;
}
.cs-back:hover { color: var(--fg); }

/* ---------- Sticky right TOC ---------- */
.cs-toc {
  position: sticky;
  top: 88px;
  justify-self: end;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
@media (max-width: 980px) { .cs-toc { display: none; } }
.cs-toc-head { color: var(--fg-4); margin-bottom: 14px; }
.cs-toc-list {
  list-style: none;
  padding: 0;
  margin: 0;
  border-right: 1px solid var(--rule);
}
.cs-toc-list li { padding: 8px 16px 8px 0; transition: border-color 0.2s; }
.cs-toc-list a {
  color: var(--fg-3);
  display: flex;
  gap: 10px;
  align-items: baseline;
  justify-content: flex-end;
  transition: color 0.15s;
}
.cs-toc-list a .n { color: var(--fg-4); width: 24px; }
.cs-toc-list a:hover { color: var(--fg); }
.cs-toc-list a.active { color: var(--fg); }
.cs-toc-list li.active { border-right: 1px solid var(--fg); margin-right: -1px; }

/* ---------- Hero ---------- */
.cs-hero-block { margin-bottom: 8px; }

.cs-eyebrow {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  align-items: baseline;
  margin-bottom: 28px;
}
.cs-eyebrow .lab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.cs-eyebrow .lab.live::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 999px;
  background: var(--signal);
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--signal) 25%, transparent);
}

h1.cs-title {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(40px, 5.4vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  margin: 0 0 24px;
  max-width: 20ch;
  text-wrap: balance;
  color: var(--fg);
}

.cs-deck {
  font-size: clamp(18px, 1.5vw, 21px);
  line-height: 1.55;
  color: var(--fg-2);
  margin: 0 0 56px;
  max-width: 58ch;
  text-wrap: pretty;
}

.cs-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-top: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  padding: 22px 0;
  margin-bottom: 56px;
  gap: 16px;
}
@media (max-width: 720px) {
  .cs-meta { grid-template-columns: repeat(2, 1fr); row-gap: 18px; }
}
.cs-meta .cell .k {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 4px;
}
.cs-meta .cell .v { font-size: 14px; color: var(--fg); line-height: 1.4; }

/* ---------- Section primitives ---------- */
section.cs-block {
  padding-top: 72px;
  scroll-margin-top: 84px;
}

.cs-section-label {
  display: flex;
  gap: 14px;
  align-items: baseline;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.cs-section-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--rule);
  align-self: center;
  margin-left: 8px;
  max-width: 200px;
}
.cs-section-label .num { color: var(--fg-4); }

h2.cs-h2 {
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: clamp(28px, 3.2vw, 36px);
  line-height: 1.1;
  letter-spacing: -0.025em;
  margin: 0 0 20px;
  max-width: 22ch;
  text-wrap: balance;
  color: var(--fg);
}

.cs-prose {
  font-size: 17px;
  line-height: 1.7;
  color: var(--fg-2);
  max-width: 60ch;
}
.cs-prose p { margin: 0 0 1.1em; }
.cs-prose strong { color: var(--fg); font-weight: 500; }
.cs-prose ul { padding-left: 1.2em; margin: 0 0 1.2em; }
.cs-prose li { margin-bottom: 0.4em; }
.cs-prose li::marker { color: var(--fg-3); }

/* ---------- Outcome — 2x2 stat grid ---------- */
.cs-outcome-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  margin: 24px 0 0;
}
@media (max-width: 720px) { .cs-outcome-grid { grid-template-columns: 1fr; } }
.cs-outcome {
  padding: 28px 24px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.cs-outcome:nth-child(2n) { border-right: 0; }
.cs-outcome:nth-last-child(-n+2) { border-bottom: 0; }
@media (max-width: 720px) {
  .cs-outcome { border-right: 0; border-bottom: 1px solid var(--rule); }
  .cs-outcome:last-child { border-bottom: 0; }
}
.cs-outcome .num {
  font-weight: 500;
  font-size: clamp(36px, 4.4vw, 52px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--fg);
}
.cs-outcome .num .unit {
  font-size: 0.42em;
  color: var(--fg-3);
  margin-left: 6px;
  letter-spacing: 0;
}
.cs-outcome .label {
  font-size: 13.5px;
  color: var(--fg-3);
  line-height: 1.5;
  margin-top: 12px;
  max-width: 30ch;
}

/* ---------- Role split ---------- */
.cs-role-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--rule);
  margin: 8px 0 0;
}
@media (max-width: 720px) { .cs-role-split { grid-template-columns: 1fr; } }
.cs-role-split > div { padding: 22px 24px; }
.cs-role-split > div + div { border-left: 1px solid var(--rule); }
@media (max-width: 720px) {
  .cs-role-split > div + div { border-left: 0; border-top: 1px solid var(--rule); }
}
.cs-role-split .k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 12px;
}
.cs-role-split ul {
  margin: 0;
  padding-left: 16px;
  font-size: 14px;
  color: var(--fg-2);
  line-height: 1.6;
}
.cs-role-split li { margin-bottom: 4px; }
.cs-role-split li::marker { color: var(--fg-3); }

/* ---------- Image frame ---------- */
.cs-frame {
  background: var(--bg-2);
  border: 1px solid var(--rule);
  padding: clamp(16px, 2vw, 32px);
  border-radius: 4px;
  margin: 32px 0;
}
.cs-frame img {
  width: 100%;
  border-radius: 2px;
  box-shadow: 0 18px 50px -24px rgba(0, 0, 0, 0.18);
}
.cs-frame-cap {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-top: 12px;
  display: flex;
  gap: 12px;
}
.cs-frame-cap .num { color: var(--fg-4); }
.cs-frame-full {
  padding: 0;
  background: transparent;
  border: 0;
}

/* ---------- Case study cover (top, full content width) ---------- */
.cs-cover {
  margin: 0 0 56px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: 6px;
  overflow: hidden;
  aspect-ratio: 16 / 9;
}
.cs-cover img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
@media (max-width: 720px) {
  .cs-cover { aspect-ratio: 4 / 3; margin-bottom: 40px; }
}

/* ---------- Deck variants (lead + deck under cs-title) ---------- */
.cs-deck-lead {
  font-size: clamp(20px, 1.8vw, 24px);
  line-height: 1.45;
  color: var(--fg);
  margin: 0 0 16px;
  max-width: 32ch;
  text-wrap: balance;
}

.cs-gallery-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 720px) { .cs-gallery-2 { grid-template-columns: 1fr; } }
.cs-gallery-2 .cs-frame { margin: 0; }

/* ---------- Feature triad — Challenge / Solution / Impact ---------- */
.cs-feature {
  border-top: 1px solid var(--rule-strong);
  padding-top: 32px;
  margin-top: 64px;
}
.cs-feature-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-4);
  margin-bottom: 8px;
}
.cs-feature-title {
  font-family: var(--font-sans);
  font-size: clamp(24px, 2.6vw, 30px);
  font-weight: 500;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 28px;
  max-width: 28ch;
  text-wrap: balance;
  color: var(--fg);
}
.cs-feature-title em {
  font-style: normal;
  color: var(--fg-3);
  font-weight: 500;
}
.cs-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
@media (max-width: 720px) { .cs-feature-grid { grid-template-columns: 1fr; } }
.cs-feature-block .k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg);
  margin-bottom: 10px;
  display: inline-flex;
  gap: 10px;
  align-items: baseline;
}
.cs-feature-block .k::before {
  content: "";
  width: 16px;
  height: 1px;
  background: var(--fg);
  display: inline-block;
}
.cs-feature-block p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--fg-2);
}

/* ---------- Pull quote ---------- */
.cs-pull {
  border-top: 1px solid var(--rule-strong);
  border-bottom: 1px solid var(--rule-strong);
  padding: 32px 0;
  margin: 64px 0 0;
  font-size: clamp(22px, 2.4vw, 28px);
  line-height: 1.35;
  letter-spacing: -0.015em;
  color: var(--fg);
  font-weight: 500;
  max-width: 32ch;
}
.cs-pull em { font-style: normal; color: var(--fg-3); font-weight: 500; }
.cs-pull cite {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-3);
  font-style: normal;
  margin-top: 18px;
}

/* ---------- Tradeoff ---------- */
.cs-tradeoff {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0 0;
}
@media (max-width: 720px) { .cs-tradeoff { grid-template-columns: 1fr; } }
.cs-tradeoff > div {
  padding: 22px;
  border: 1px solid var(--rule);
}
.cs-tradeoff .chose { border-color: var(--fg); }
.cs-tradeoff .cut { background: var(--bg-2); }
.cs-tradeoff .k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 10px;
}
.cs-tradeoff .chose .k { color: var(--fg); }
.cs-tradeoff .cut .k { color: var(--fg-3); }
.cs-tradeoff p {
  margin: 0;
  font-size: 14px;
  line-height: 1.55;
  color: var(--fg-2);
}

/* ---------- Foot — next + ask ---------- */
.cs-foot {
  border-top: 1px solid var(--rule);
  margin-top: 80px;
  padding: 48px 0 32px;
}
.cs-foot .lab {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 16px;
}
.cs-foot .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--fg-3);
}
.cs-foot .row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 24px 0;
  border-top: 1px solid var(--rule-strong);
  cursor: pointer;
  transition: padding 0.25s;
}
.cs-foot .row:hover { padding-left: 12px; }
.cs-foot .t {
  font-size: clamp(28px, 3.6vw, 44px);
  letter-spacing: -0.02em;
  line-height: 1;
  font-weight: 500;
  color: var(--fg);
}
.cs-foot .arrow {
  font-family: var(--font-mono);
  color: var(--fg-3);
  font-size: 22px;
}
.cs-foot .row:hover .arrow { color: var(--fg); }

/* ---------- Ask AI ---------- */
.cs-ask {
  margin-top: 56px;
  padding: 32px;
  background: var(--bg-2);
  border: 1px solid var(--rule);
  border-radius: 4px;
}
.cs-ask .lab {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--fg-3);
  margin-bottom: 10px;
}
.cs-ask h3 {
  margin: 0 0 8px;
  font-size: 22px;
  font-weight: 500;
  letter-spacing: -0.015em;
  color: var(--fg);
}
.cs-ask p {
  margin: 0 0 16px;
  font-size: 14.5px;
  color: var(--fg-3);
}
.cs-ask .input {
  display: flex;
  gap: 8px;
  background: var(--bg);
  border: 1px solid var(--rule-2);
  border-radius: 999px;
  padding: 6px 6px 6px 18px;
  align-items: center;
}
.cs-ask input {
  flex: 1;
  border: 0;
  outline: 0;
  background: transparent;
  font-family: inherit;
  font-size: 14px;
  color: var(--fg);
}
.cs-ask input::placeholder { color: var(--fg-4); }
.cs-ask button {
  border: 0;
  background: var(--fg);
  color: var(--bg);
  font-family: inherit;
  font-size: 13px;
  padding: 8px 16px;
  border-radius: 999px;
  cursor: pointer;
  transition: opacity 0.15s;
}
.cs-ask button:disabled { opacity: 0.5; cursor: wait; }
.cs-ask .answer {
  margin-top: 18px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--fg-2);
  background: var(--bg);
  border: 1px solid var(--rule);
  padding: 16px 18px;
  border-radius: 4px;
  white-space: pre-wrap;
}
.cs-ask .chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}
.cs-ask .chip {
  font-size: 12.5px;
  color: var(--fg-2);
  border: 1px solid var(--rule-2);
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--bg);
  cursor: pointer;
  transition: all 0.15s;
}
.cs-ask .chip:hover { border-color: var(--fg); color: var(--fg); }