/* ---------------------------------------------------------------
   Reza Yaghobi — personal site
   Tokens, base, layout, components, motion, responsive.
   --------------------------------------------------------------- */

@font-face {
  font-family: "Bricolage Grotesque";
  src: url("fonts/bricolage-grotesque-latin-wght-normal.woff2") format("woff2");
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "Instrument Sans";
  src: url("fonts/instrument-sans-latin-wght-normal.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: dark;

  --bg: #0a0d14;
  --surface: #0e131c;
  --surface-2: #121926;
  --line: #232b3a;
  --line-soft: #1a2130;
  --text: #eef2f8;
  --muted: #9aa7bc;
  --faint: #7d8aa0;
  --accent: #6fe3b0;
  --accent-dim: rgba(111, 227, 176, 0.4);

  --display: "Bricolage Grotesque", "Instrument Sans", system-ui, -apple-system,
    "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --sans: "Instrument Sans", system-ui, -apple-system, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  --mono: ui-monospace, "SFMono-Regular", Menlo, Consolas, "Liberation Mono",
    monospace;

  --wrap: 1120px;
  --gutter: clamp(20px, 5vw, 48px);
  --radius: 14px;
  --radius-sm: 10px;
  --ease: cubic-bezier(0.2, 0.6, 0.2, 1);
}

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

html {
  scroll-padding-top: 24px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.65 var(--sans);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

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

img {
  height: auto;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

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

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

::selection {
  background: var(--accent);
  color: #04120c;
}

h1,
h2,
h3,
h4,
p,
ul,
ol,
figure {
  margin: 0;
}

ul,
ol {
  list-style: none;
  padding: 0;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 12px;
  z-index: 100;
  padding: 12px 18px;
  border-radius: 8px;
  background: var(--accent);
  color: #04120c;
  font: 600 14px/1 var(--sans);
  text-decoration: none;
}

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

/* ---------- progress line (JS only) ---------- */

.progress {
  display: none;
}

html.anims .progress {
  display: block;
  position: fixed;
  inset: 0 0 auto 0;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: 0 50%;
  z-index: 60;
  pointer-events: none;
}

/* ---------- header ---------- */

.site-header {
  border-bottom: 1px solid var(--line-soft);
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 28px;
  padding-block: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  font: 600 16px/1 var(--display);
  letter-spacing: -0.01em;
  text-decoration: none;
}

.brand::before {
  content: "";
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}

.site-nav a {
  position: relative;
  color: var(--muted);
  font: 500 13px/1 var(--sans);
  letter-spacing: 0.01em;
  text-decoration: none;
}

.site-nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 1px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.22s var(--ease);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--text);
}

.site-nav a:hover::after,
.site-nav a:focus-visible::after {
  transform: scaleX(1);
}

/* ---------- hero ---------- */

.hero {
  padding-block: clamp(64px, 12vw, 130px) clamp(56px, 9vw, 100px);
}

.hero__label {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: clamp(18px, 3vw, 28px);
  color: var(--accent);
  font: 500 11.5px/1.4 var(--mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.hero__label::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--accent);
}

.hero__title {
  margin-bottom: clamp(24px, 4vw, 36px);
  font: 650 clamp(3.2rem, 12.5vw, 8rem)/0.9 var(--display);
  letter-spacing: -0.035em;
}

.hero__lede {
  max-width: 56ch;
  color: #b7c2d3;
  font-size: clamp(16px, 2.2vw, 19px);
  line-height: 1.6;
  text-wrap: pretty;
}

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

.hero__actions {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 10px;
  margin-top: clamp(32px, 5vw, 48px);
}

.action {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.16s ease, background-color 0.16s ease;
}

.action:hover {
  border-color: var(--accent);
  background: var(--surface-2);
}

.action__label {
  font: 600 14px/1.3 var(--sans);
}

.action__meta {
  overflow-wrap: anywhere;
  color: var(--faint);
  font: 400 11.5px/1.4 var(--mono);
}

/* ---------- sections ---------- */

.section {
  padding-block: clamp(56px, 8vw, 88px);
  border-top: 1px solid var(--line-soft);
}

.section__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: clamp(26px, 4vw, 40px);
}

.section__title {
  font: 600 clamp(1.9rem, 4.6vw, 2.9rem)/1.05 var(--display);
  letter-spacing: -0.025em;
}

.section__note {
  color: var(--faint);
  font: 400 11px/1.5 var(--mono);
  text-align: right;
}

.section--stack .section__title,
.section--certs .section__title {
  font-size: clamp(2.3rem, 6vw, 3.8rem);
  font-weight: 650;
}

/* ---------- stack ---------- */

.group-title {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 38px 0 16px;
  color: var(--faint);
  font: 500 11px/1.4 var(--mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.group-title:first-of-type {
  margin-top: 0;
}

.group-title::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--line-soft);
}

.tiles {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.tile {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  gap: 18px;
  min-height: 124px;
  padding: 20px 16px 15px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  transition: border-color 0.16s ease, background-color 0.16s ease,
    transform 0.18s var(--ease);
}

.tile:hover {
  border-color: var(--brand, var(--accent));
  background: var(--surface-2);
  transform: translateY(-2px);
}

.tile__icon {
  width: 38px;
  height: 38px;
  flex: none;
}

.tile__name {
  font: 500 13px/1.35 var(--sans);
  letter-spacing: -0.005em;
  overflow-wrap: anywhere;
}

.tile__note {
  display: block;
  color: var(--faint);
  font: 400 10.5px/1.4 var(--mono);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chip {
  padding: 7px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font: 400 12.5px/1.4 var(--sans);
}

/* ---------- certificates ---------- */

.cert-ielts {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  padding: 20px 22px;
  margin-bottom: 12px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  font: 600 clamp(1.25rem, 2.6vw, 1.7rem)/1.2 var(--display);
  letter-spacing: -0.01em;
}

.cert-ielts span {
  display: block;
  color: var(--muted);
  font: 400 11px/1.5 var(--mono);
}

.ladder {
  display: grid;
  gap: 10px;
}

.cert-step {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-top-width: 3px;
  border-radius: var(--radius-sm);
  background: linear-gradient(180deg, var(--surface-2), var(--surface));
}

.cert-step:nth-child(1) {
  border-top-color: rgba(111, 227, 176, 0.35);
}

.cert-step:nth-child(2) {
  border-top-color: rgba(111, 227, 176, 0.65);
}

.cert-step:nth-child(3) {
  border-top-color: var(--accent);
}

.cert-step__num {
  margin-bottom: 22px;
  color: var(--accent);
  font: 500 11px/1 var(--mono);
  letter-spacing: 0.16em;
}

.cert-step:nth-child(1) .cert-step__num {
  color: rgba(111, 227, 176, 0.55);
}

.cert-step:nth-child(2) .cert-step__num {
  color: rgba(111, 227, 176, 0.8);
}

.cert-step__name {
  margin-bottom: 8px;
  font: 600 clamp(1.15rem, 2.3vw, 1.5rem)/1.25 var(--display);
  letter-spacing: -0.015em;
  text-wrap: balance;
}

.cert-step__meta {
  margin-top: auto;
  color: var(--muted);
  font: 400 11px/1.6 var(--mono);
}

.cert-step__issuer {
  margin-top: 2px;
  color: var(--faint);
  font: 400 12px/1.5 var(--sans);
}

.certs-block {
  margin-top: 44px;
  padding-top: 30px;
  border-top: 1px solid var(--line-soft);
}

.certs-block .group-title {
  margin-top: 0;
}

.group-sub {
  margin: -6px 0 18px;
  color: var(--faint);
  font: 400 12px/1.5 var(--sans);
}

.courses {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
}

.course {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 4px 16px;
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-radius: 9px;
  background: transparent;
}

.course__name {
  color: #c9d2e1;
  font: 500 14px/1.4 var(--sans);
}

.course__meta {
  color: var(--faint);
  font: 400 11px/1.5 var(--mono);
}

/* ---------- certificate images ---------- */

.cert-gallery {
  display: grid;
  gap: 18px;
}

.cert-shot__frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--surface);
  transition: border-color 0.2s ease;
}

.cert-shot__frame img {
  display: block;
  width: 100%;
  height: auto;
  transition: transform 0.45s var(--ease);
}

.cert-shot__frame::after {
  content: "\2197";
  position: absolute;
  right: 10px;
  bottom: 10px;
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border: 1px solid var(--line);
  border-radius: 7px;
  background: rgba(10, 13, 20, 0.82);
  color: var(--accent);
  font: 400 13px/1 var(--mono);
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.cert-shot:hover .cert-shot__frame {
  border-color: var(--accent-dim);
}

.cert-shot:hover .cert-shot__frame img {
  transform: scale(1.015);
}

.cert-shot:hover .cert-shot__frame::after {
  border-color: var(--accent);
  background: rgba(10, 13, 20, 0.96);
}

.cert-shot__caption {
  margin-top: 10px;
  color: var(--muted);
  font: 400 12.5px/1.5 var(--sans);
}

/* ---------- selected work ---------- */

.work-list {
  border-top: 1px solid var(--line);
}

.work-row {
  display: grid;
  gap: 6px 32px;
  padding: 24px 0;
  border-bottom: 1px solid var(--line-soft);
}

.work-row__title {
  font: 600 1.15rem/1.3 var(--display);
  letter-spacing: -0.01em;
}

.work-row__text {
  max-width: 68ch;
  color: var(--muted);
  font-size: 14.5px;
  text-wrap: pretty;
}

.work-row__link {
  align-self: start;
  color: var(--accent);
  font: 400 12px/1.5 var(--mono);
  text-decoration: none;
  white-space: nowrap;
}

.work-row__link:hover {
  text-decoration: underline;
}

.work-more {
  margin-top: 22px;
  color: var(--faint);
  font: 400 12px/1.8 var(--mono);
}

.work-more a {
  color: var(--muted);
  text-decoration-color: transparent;
}

.work-more a:hover {
  color: var(--accent);
  text-decoration-color: var(--accent);
}

/* ---------- diagrams and screenshots ---------- */

.diagram-block {
  margin-bottom: 54px;
}

.diagram-block:last-child {
  margin-bottom: 0;
}

.diagram {
  padding: 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: #0b1018;
}

.diagram__title {
  margin-bottom: 4px;
  font: 600 1rem/1.4 var(--sans);
}

.diagram__caption {
  margin-top: 14px;
  color: var(--faint);
  font: 400 11.5px/1.6 var(--mono);
}

.diagram__caption b {
  color: var(--muted);
  font-weight: 500;
}

.diagram svg {
  width: 100%;
  height: auto;
  overflow: visible;
}

.diagram svg.diagram--wide {
  display: block;
}

.diagram svg.diagram--narrow {
  display: none;
  max-width: 420px;
  margin-inline: auto;
}

.dg-box {
  fill: none;
  stroke: #2c3648;
  stroke-width: 1;
}

.dg-box--accent {
  stroke: var(--accent-dim);
}

.dg-text {
  fill: #c4cede;
  font-family: var(--mono);
  font-size: 12px;
}

.dg-sub {
  fill: var(--faint);
  font-family: var(--mono);
  font-size: 9.5px;
  letter-spacing: 0.04em;
}

.dg-line {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.dg-soft {
  stroke-opacity: 0.45;
}

.dg-node {
  fill: var(--accent);
}

.dg-anchor {
  fill: #0b1018;
}

html.anims .diagram .draw {
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
}

html.anims .diagram.is-in .draw {
  stroke-dashoffset: 0;
  transition: stroke-dashoffset 1.3s var(--ease);
}

html.anims .diagram .d2 {
  transition-delay: 0.12s;
}

html.anims .diagram .d3 {
  transition-delay: 0.24s;
}

html.anims .diagram .d4 {
  transition-delay: 0.36s;
}

html.anims .diagram .d5 {
  transition-delay: 0.48s;
}

html.anims .diagram .d6 {
  transition-delay: 0.6s;
}

.shot {
  margin: 12px 0 0;
}

.shot__frame {
  overflow: hidden;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.shot img {
  display: block;
  width: 100%;
  height: auto;
}

.shot figcaption {
  margin-top: 9px;
  color: var(--faint);
  font: 400 11px/1.5 var(--mono);
}

/* ---------- background ---------- */

.timeline {
  border-top: 1px solid var(--line);
}

.timeline__item {
  display: grid;
  gap: 4px 28px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

.timeline__when {
  color: var(--faint);
  font: 400 11px/1.7 var(--mono);
  letter-spacing: 0.02em;
}

.timeline__what {
  color: #ccd5e3;
  font-size: 14.5px;
  line-height: 1.6;
}

/* ---------- contact ---------- */

.contact__lede {
  max-width: 44ch;
  margin-bottom: 28px;
  color: var(--muted);
  font-size: clamp(16px, 2vw, 18px);
}

.contact-rows {
  border-top: 1px solid var(--line);
}

.contact-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
  color: var(--text);
  text-decoration: none;
}

.contact-row__label {
  color: var(--faint);
  font: 500 11px/1.5 var(--mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.contact-row__value {
  display: flex;
  align-items: baseline;
  gap: 14px;
  overflow-wrap: anywhere;
  font: 500 clamp(1.05rem, 2.6vw, 1.45rem)/1.3 var(--sans);
  letter-spacing: -0.01em;
  text-align: right;
}

.contact-row__arrow {
  color: var(--accent);
  font: 400 1.1rem/1 var(--mono);
  transition: transform 0.2s var(--ease);
}

.contact-row:hover .contact-row__value {
  color: var(--accent);
}

.contact-row:hover .contact-row__arrow {
  transform: translateX(4px);
}

/* ---------- footer ---------- */

.site-footer {
  padding-block: 28px;
  border-top: 1px solid var(--line-soft);
  color: var(--faint);
  font: 400 11.5px/1.6 var(--mono);
}

/* ---------- motion ---------- */

@keyframes hero-in {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(9px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

html.anims .reveal {
  opacity: 0;
  transform: translateY(14px);
}

html.anims .reveal.is-in {
  opacity: 1;
  transform: none;
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

html.anims .hero__label,
html.anims .hero__title,
html.anims .hero__lede,
html.anims .hero__actions {
  animation: hero-in 0.62s var(--ease) both;
}

html.anims .hero__title {
  animation-delay: 70ms;
}

html.anims .hero__lede {
  animation-delay: 140ms;
}

html.anims .hero__actions {
  animation-delay: 210ms;
}

html.anims .tiles.is-in > .tile,
html.anims .chips.is-in > .chip,
html.anims .ladder.is-in > .cert-step,
html.anims .courses.is-in > .course,
html.anims .cert-gallery.is-in > .cert-shot,
html.anims .work-list.is-in > .work-row,
html.anims .timeline.is-in > .timeline__item,
html.anims .contact-rows.is-in > .contact-row {
  animation: rise-in 0.5s var(--ease) backwards;
  animation-delay: calc(var(--i, 0) * 40ms);
}

/* ---------- wider screens ---------- */

@media (min-width: 560px) {
  .tiles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .courses {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 700px) {
  .site-header__inner {
    flex-wrap: nowrap;
  }

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

  .timeline__item {
    grid-template-columns: 190px 1fr;
    align-items: baseline;
  }

  .work-row {
    grid-template-columns: minmax(0, 220px) 1fr auto;
    align-items: start;
  }

  .work-row__title {
    grid-column: 1;
  }

  .work-row__text {
    grid-column: 2;
  }

  .work-row__link {
    grid-column: 3;
  }
}

@media (min-width: 760px) {
  .tiles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .ladder {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: end;
    position: relative;
    padding-top: 54px;
  }

  .ladder::before {
    content: "";
    position: absolute;
    top: 26px;
    left: 8px;
    right: 8px;
    height: 1px;
    background: linear-gradient(
      90deg,
      rgba(111, 227, 176, 0.18),
      rgba(111, 227, 176, 0.55) 55%,
      rgba(111, 227, 176, 0.95)
    );
  }

  .cert-step {
    min-height: 176px;
  }

  .cert-step:nth-child(2) {
    min-height: 208px;
  }

  .cert-step:nth-child(3) {
    min-height: 240px;
  }

  .cert-step__num {
    position: absolute;
    top: -54px;
    left: 20px;
    display: grid;
    place-items: center;
    width: 52px;
    height: 52px;
    margin: 0;
    border: 1px solid var(--line);
    border-radius: 50%;
    background: var(--bg);
  }

  .diagram {
    padding: 28px;
  }
}

@media (min-width: 980px) {
  .cert-gallery {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .tiles {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .tile {
    min-height: 136px;
  }
}

@media (max-width: 799px) {
  .diagram svg.diagram--wide {
    display: none;
  }

  .diagram svg.diagram--narrow {
    display: block;
  }
}

@media (max-width: 699px) {
  .site-nav {
    width: 100%;
    justify-content: flex-start;
    gap: 10px 18px;
  }

  .section__note {
    display: none;
  }

  .contact-row {
    flex-direction: column;
    gap: 6px;
  }

  .contact-row__value {
    text-align: left;
  }
}

@media (max-width: 559px) {
  .site-header__inner {
    padding-block: 16px;
  }

  .tile {
    min-height: 116px;
    padding: 16px 14px 13px;
  }

  .tile__icon {
    width: 34px;
    height: 34px;
  }

  .cert-step {
    padding: 18px 18px 20px;
  }

  .cert-step__num {
    margin-bottom: 16px;
  }

  .diagram {
    padding: 14px;
  }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0s !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }

  html.anims .reveal {
    opacity: 1;
    transform: none;
  }

  .tile:hover,
  .contact-row:hover .contact-row__arrow,
  .cert-shot:hover .cert-shot__frame img {
    transform: none;
  }

  html.anims .diagram .draw {
    stroke-dasharray: none;
    stroke-dashoffset: 0;
  }

  html.anims .progress {
    display: none;
  }
}

@media print {
  .site-header,
  .progress,
  .hero__actions {
    display: none;
  }

  html.anims .reveal {
    opacity: 1;
    transform: none;
  }

  html.anims .diagram .draw {
    stroke-dasharray: none;
    stroke-dashoffset: 0;
  }

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