/* =====================================================
   design system — mohammad shamchi rezaeiyeh
   geist + geist mono · warm neutral · muted indigo accent
   ===================================================== */

/* ---- tokens ---- */
:root {
  /* surfaces */
  --bg:           #faf9f6;
  --surface:      #ffffff;
  --border:       #e7e2d9;

  /* text */
  --text:         #161616;
  --muted:        #6b6b6b;

  /* accent */
  --accent:       #4f6df5;
  --accent-ink:   #3b56d6;   /* hover */
  --accent-soft:  #eef2ff;

  /* type */
  --sans: "Geist", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Arial, sans-serif;
  --mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  /* type scale (rio's spec) */
  --t-hero:    clamp(3rem,    2.4rem  + 2.5vw, 4rem);      /* 48–64 */
  --t-h2:      clamp(1.75rem, 1.5rem  + 0.8vw, 2.25rem);   /* 28–36 */
  --t-h3:      clamp(1.25rem, 1.12rem + 0.4vw, 1.5rem);    /* 20–24 */
  --t-body:    clamp(1rem,    0.95rem + 0.2vw, 1.125rem);  /* 16–18 */
  --t-lede:    clamp(1.125rem, 1.05rem + 0.4vw, 1.3125rem);/* 18–21 */
  --t-meta:    0.78rem;                                    /* 12–13 */

  /* line height */
  --lh-tight: 1.08;
  --lh-snug:  1.22;
  --lh-body:  1.62;

  /* spacing scale (rio's: 4/8/12/16/24/32/48/64/96) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;

  /* radius (one primary + sm) */
  --radius-sm: 6px;
  --radius:    12px;
  --radius-lg: 999px;       /* pill */

  /* layout */
  --measure: 68ch;
  --max-w:   1120px;
  --gutter:  clamp(1.25rem, 4vw, 2.5rem);
  --section: clamp(4rem, 8vw, 7rem);

  /* motion */
  --ease: cubic-bezier(.2,.6,.2,1);
}

/* ---- reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, p, ul, ol, figure, blockquote { margin: 0; padding: 0; }
ul[role="list"], ol[role="list"] { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }

/* ---- base ---- */
html { scroll-behavior: smooth; }
body {
  font-family: var(--sans);
  font-size: var(--t-body);
  line-height: var(--lh-body);
  color: var(--text);
  background: var(--bg);
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

::selection { background: var(--accent); color: #fff; }

/* ---- typography ---- */
h1, h2, h3, h4 {
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: -0.018em;
  color: var(--text);
  line-height: var(--lh-tight);
}
h1 { font-size: var(--t-hero); letter-spacing: -0.028em; line-height: 1.04; }
h2 { font-size: var(--t-h2); letter-spacing: -0.018em; line-height: 1.12; font-weight: 600; }
h3 { font-size: var(--t-h3); letter-spacing: -0.012em; line-height: 1.2; font-weight: 500; }
h4 { font-size: 1rem; font-weight: 500; }

p, li { color: var(--text); }
p + p { margin-top: 0.85em; }

.lede {
  font-size: var(--t-lede);
  line-height: 1.5;
  color: var(--text);
  font-weight: 400;
  letter-spacing: -0.005em;
  max-width: 56ch;
}

.eyebrow {
  font-family: var(--mono);
  font-size: var(--t-meta);
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.measure { max-width: var(--measure); }

/* ---- links ---- */
a {
  color: var(--text);
  text-decoration: none;
  text-underline-offset: 0.22em;
  transition: color .2s var(--ease);
}
.prose a, a.link {
  text-decoration: underline;
  text-decoration-color: var(--border);
  text-decoration-thickness: 1px;
}
.prose a:hover, a.link:hover { color: var(--accent); text-decoration-color: var(--accent); }

/* ---- buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.78rem 1.15rem;
  font-family: var(--sans);
  font-size: 0.95rem;
  font-weight: 500;
  letter-spacing: -0.005em;
  border-radius: 999px;
  border: 1px solid transparent;
  background: var(--text);
  color: var(--bg);
  transition: background .25s var(--ease), color .25s var(--ease), border-color .25s var(--ease), transform .25s var(--ease);
  cursor: pointer;
}
.btn:hover { background: var(--accent); color: #fff; }
.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}
.btn--ghost:hover { border-color: var(--text); color: var(--text); background: var(--surface); }
.btn .arrow { transition: transform .25s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

/* ---- layout ---- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: var(--section); }
.section + .section { border-top: 1px solid var(--border); }

.grid { display: grid; gap: 2rem; }
.grid-2 { grid-template-columns: 1fr; }
.grid-3 { grid-template-columns: 1fr; }
@media (min-width: 720px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
}
@media (min-width: 880px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); gap: 2.25rem; }
}

/* ---- header ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: saturate(140%) blur(12px);
  background: color-mix(in oklab, var(--bg) 86%, transparent);
  border-bottom: 1px solid var(--border);
}
.site-header .row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1.05rem;
  gap: 1.5rem;
}
.brand {
  font-family: var(--sans);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: -0.012em;
  color: var(--text);
}
.brand .dot { color: var(--accent); }
.nav {
  display: none;
  gap: 1.6rem;
  font-size: 0.93rem;
  color: var(--muted);
}
.nav a:hover { color: var(--text); }
.nav a.is-active { color: var(--text); }
.nav a.is-active::after {
  content: "";
  display: block;
  height: 1px;
  background: var(--text);
  margin-top: 4px;
}
.header-cta { display: none; }
@media (min-width: 720px) {
  .nav { display: inline-flex; }
  .header-cta { display: inline-flex; }
}

/* ---- hero ---- */
.hero {
  padding-block: clamp(4rem, 10vw, 8rem) var(--section);
  position: relative;
}
.hero .availability {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.6rem;
}
.hero .availability .pulse {
  width: 7px; height: 7px; border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 0 color-mix(in oklab, var(--accent) 60%, transparent);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 color-mix(in oklab, var(--accent) 60%, transparent); }
  70%  { box-shadow: 0 0 0 12px color-mix(in oklab, var(--accent) 0%, transparent); }
  100% { box-shadow: 0 0 0 0 color-mix(in oklab, var(--accent) 0%, transparent); }
}
.hero h1 .accent {
  color: var(--accent);
  font-style: normal;
}
.hero .lede { margin-top: 1.4rem; max-width: 38ch; }
.hero .ctas {
  margin-top: 2rem;
  display: flex; flex-wrap: wrap; gap: 0.75rem;
}
.hero .meta {
  margin-top: 2rem;
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ---- trust strip ---- */
.trust {
  background: var(--surface);
  border-block: 1px solid var(--border);
  padding-block: 2.2rem;
}
.trust .container {
  display: grid;
  gap: 1rem 2rem;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .trust .container { grid-template-columns: repeat(4, 1fr); }
}
.trust dt {
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.35rem;
  font-weight: 400;
}
.trust dd { color: var(--text); font-size: 0.95rem; }

/* ---- section heading ---- */
.section-head {
  display: grid;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}
.section-head h2 .num {
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  display: block;
  margin-bottom: 0.65rem;
  font-weight: 400;
}
.section-head .sub { color: var(--muted); max-width: 56ch; }

/* ---- service cards ---- */
.service {
  padding: 1.85rem 1.6rem;
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 6px;
  transition: border-color .25s var(--ease), background .25s var(--ease);
}
.service:hover { border-color: var(--text); }
.service .num {
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--muted);
  letter-spacing: 0.08em;
}
.service h3 {
  margin-top: 0.85rem;
  font-size: var(--t-h3);
  font-weight: 500;
  letter-spacing: -0.012em;
}
.service .who {
  margin-top: 0.85rem;
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.service p { margin-top: 0.7rem; font-size: 0.97rem; line-height: 1.55; }

/* ---- services grid (homepage "Three kinds of work" section) ----
   Featured-first layout: rescue (most proof) takes the top row at full width
   on desktop; the two supporting categories share a row underneath. Internal
   spacing relaxed, .who line softened from uppercase mono label into an
   editorial lead. Scoped so rescue.html .service cards stay untouched. */
.services-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}
.services-grid .service h3 {
  margin-top: 1rem;
}
.services-grid .service .who {
  margin-top: 1.1rem;
  font-family: var(--sans);
  font-size: 0.97rem;
  line-height: 1.55;
  color: var(--muted);
  text-transform: none;
  letter-spacing: 0;
  max-width: 60ch;
}
.services-grid .service p {
  margin-top: 1rem;
  line-height: 1.62;
  max-width: 76ch;
}
@media (min-width: 880px) {
  .services-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem;
  }
  .services-grid > .service--featured {
    grid-column: 1 / -1;
    padding: 2.25rem 2.25rem 2rem;
  }
}

/* ---- work list ---- */
.work-list { border-top: 1px solid var(--border); }
.work-item {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
  padding-block: 1.6rem;
  border-bottom: 1px solid var(--border);
  transition: background .3s var(--ease);
}
.work-item:hover { background: var(--surface); }
.work-item:hover .work-title .arrow { transform: translateX(4px); }
.work-item a { display: contents; }
@media (min-width: 880px) {
  .work-item {
    grid-template-columns: 90px 1.4fr 2fr 1fr auto;
    align-items: baseline;
    gap: 2rem;
  }
}
.work-year {
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--muted);
  letter-spacing: 0.04em;
}
.work-title {
  font-family: var(--sans);
  font-size: var(--t-h3);
  font-weight: 500;
  color: var(--text);
  letter-spacing: -0.012em;
  display: inline-flex;
  align-items: baseline;
  gap: 0.5rem;
}
.work-title .arrow { transition: transform .25s var(--ease); color: var(--muted); }
.work-summary { color: var(--text); font-size: 0.97rem; line-height: 1.55; max-width: 56ch; }
.work-tags {
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* ---- principles ---- */
.principles { display: grid; gap: 0; }
.principles li {
  padding: 1.4rem 0;
  border-top: 1px solid var(--border);
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 1.25rem;
  align-items: baseline;
}
.principles li:last-child { border-bottom: 1px solid var(--border); }
.principles .n {
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--muted);
  letter-spacing: 0.06em;
}
.principles .text {
  font-family: var(--sans);
  font-size: var(--t-h3);
  font-weight: 500;
  color: var(--text);
  line-height: 1.32;
  letter-spacing: -0.012em;
}

/* ---- writing ---- */
.writing-list { display: grid; gap: 0; }
.writing-item {
  padding: 1.5rem 0;
  border-top: 1px solid var(--border);
  display: grid;
  gap: 0.5rem;
}
.writing-item:last-child { border-bottom: 1px solid var(--border); }
.writing-item h3 {
  font-size: var(--t-h3);
  font-weight: 500;
  letter-spacing: -0.012em;
}
.writing-item .meta {
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--muted);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.writing-item p { color: var(--muted); }

/* ---- testimonials ---- */
.testimonial-list {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .testimonial-list.cols-2 { grid-template-columns: repeat(2, 1fr); }
  .testimonial-list.cols-3 { grid-template-columns: repeat(3, 1fr); }
}
.testimonial {
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 1.6rem 1.5rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
}
.testimonial blockquote {
  font-size: 1rem;
  line-height: 1.55;
  color: var(--text);
  letter-spacing: -0.005em;
}
.testimonial blockquote p { color: var(--text); }
.testimonial blockquote p + p { margin-top: 0.7em; }
.testimonial cite {
  font-style: normal;
  display: block;
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  margin-top: auto;
}
.testimonial cite .name {
  display: block;
  font-weight: 500;
  color: var(--text);
  font-size: 0.95rem;
}
.testimonial cite .role {
  display: block;
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: 0.3rem;
}
.testimonial cite .context {
  display: block;
  font-family: var(--mono);
  font-size: var(--t-meta);
  color: var(--muted);
  margin-top: 0.3rem;
}

/* Editorial row variant: stacked, no card chrome, left-aligned with section content.
   Rows are separated by hairline dividers, not boxes. */
.testimonial-list--editorial {
  display: block;
  max-width: 720px;
  margin-inline: 0;
}
.testimonial-list--editorial .testimonial {
  border: 0;
  background: transparent;
  padding: 1.85rem 0;
  gap: 1.35rem;
}
.testimonial-list--editorial .testimonial:first-child {
  padding-top: 0.25rem;
}
.testimonial-list--editorial .testimonial + .testimonial {
  border-top: 1px solid var(--border);
}
.testimonial-list--editorial .testimonial blockquote {
  font-size: 1.0625rem;
  line-height: 1.65;
}
.testimonial-list--editorial .testimonial cite {
  border-top: 0;
  padding-top: 0;
}
.testimonial-list--editorial .testimonial cite .name {
  font-size: 0.97rem;
  letter-spacing: -0.005em;
}
.testimonial-list--editorial .testimonial cite .role,
.testimonial-list--editorial .testimonial cite .context {
  margin-top: 0.35rem;
}
.testimonial-list--editorial .testimonial cite .context {
  color: color-mix(in oklab, var(--muted) 75%, var(--bg));
  text-transform: none;
  letter-spacing: 0;
}
@media (min-width: 720px) {
  .testimonial-list--editorial .testimonial {
    padding: 2.5rem 0;
    gap: 1.5rem;
  }
  .testimonial-list--editorial .testimonial:first-child {
    padding-top: 0.5rem;
  }
}

.testimonial--inline {
  padding: 1.5rem 1.6rem;
  background: var(--surface);
  border-left: 2px solid var(--accent);
  border-top: 1px solid var(--border);
  border-right: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ---- cta band ---- */
.cta-band {
  background: var(--text);
  color: var(--bg);
  padding-block: var(--section);
}
.cta-band h2 { color: var(--bg); max-width: 18ch; }
.cta-band .lede { color: color-mix(in oklab, var(--bg) 86%, transparent); margin-top: 1.5rem; max-width: 50ch; }
.cta-band .btn { background: var(--bg); color: var(--text); }
.cta-band .btn:hover { background: var(--accent); color: #fff; }
.cta-band .btn--ghost { background: transparent; color: var(--bg); border-color: color-mix(in oklab, var(--bg) 30%, transparent); }
.cta-band .btn--ghost:hover { border-color: var(--bg); background: transparent; color: var(--bg); }
.cta-band .ctas { margin-top: 2rem; display: flex; flex-wrap: wrap; gap: 0.8rem; }

/* ---- footer ---- */
.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 3rem 2rem;
  font-size: 0.92rem;
  background: var(--bg);
}
.site-footer .row {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}
@media (min-width: 720px) {
  .site-footer .row { grid-template-columns: 2fr 1fr 1fr 1fr; }
}
.site-footer h4 {
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 400;
  margin-bottom: 0.85rem;
}
.site-footer ul { display: grid; gap: 0.45rem; list-style: none; }
.site-footer .colophon {
  margin-top: 2.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
  display: flex; flex-wrap: wrap; gap: 1rem; justify-content: space-between;
  color: var(--muted);
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: 0.04em;
}

/* ---- prose ---- */
.prose { max-width: var(--measure); }
.prose h2 { margin-top: 2.4rem; font-size: var(--t-h2); font-weight: 600; }
.prose h3 { margin-top: 1.8rem; font-size: var(--t-h3); font-weight: 500; }
.prose p, .prose ul, .prose ol { margin-top: 1rem; }
.prose ul { padding-left: 1.1rem; }
.prose li { margin-top: 0.35rem; }

/* ---- definition list ---- */
.dl {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem 2rem;
  border-top: 1px solid var(--border);
  padding-top: 1.5rem;
}
@media (min-width: 720px) {
  .dl { grid-template-columns: 200px 1fr; }
}
.dl dt {
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 400;
}
.dl dd { color: var(--text); }

/* ---- callout ---- */
.callout {
  background: var(--accent-soft);
  border: 1px solid color-mix(in oklab, var(--accent) 20%, var(--border));
  border-radius: var(--radius);
  padding: 1.4rem 1.5rem;
  display: grid;
  gap: 0.5rem;
  max-width: var(--measure);
}
.callout .label {
  font-family: var(--mono);
  font-size: var(--t-meta);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent-ink);
}
.callout p { color: var(--text); }

/* ---- faq ---- */
.faq { display: grid; gap: 0; max-width: var(--measure); }
.faq details {
  border-top: 1px solid var(--border);
  padding-block: 1.1rem;
}
.faq details:last-child { border-bottom: 1px solid var(--border); }
.faq summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-family: var(--sans);
  font-size: var(--t-h3);
  font-weight: 500;
  letter-spacing: -0.012em;
  color: var(--text);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  font-family: var(--mono);
  font-size: 1.1rem;
  color: var(--muted);
  transition: transform .25s var(--ease);
}
.faq details[open] summary::after { content: "−"; transform: rotate(0); }
.faq details > p { margin-top: 0.85rem; color: var(--muted); }

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

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