/* ==========================================================
   Sadisu Hassan portfolio
   Palette borrows from fibre optics: aqua jacket, yellow
   single-mode jacket, splice points along the run.
   ========================================================== */

:root {
  --paper: #f3f6f5;
  --surface: #ffffff;
  --ink: #13201d;
  --muted: #55635f;
  --rule: #d5dedb;
  --fibre: #0d8784;
  --fibre-soft: #d6ecea;
  --splice: #f2b90f;
  --danger: #b3261e;
  --deep: #13201d;
  --deep-ink: #eef3f1;

  --font: "Schibsted Grotesk", system-ui, -apple-system, "Segoe UI", sans-serif;

  --step--1: 0.875rem;
  --step-0: 1.0625rem;
  --step-1: 1.25rem;
  --step-2: 1.5rem;
  --step-3: clamp(1.75rem, 1.3rem + 1.6vw, 2.5rem);
  --step-4: clamp(2.4rem, 1.4rem + 4vw, 4.5rem);

  --wrap: 72rem;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --section: clamp(4rem, 8vw, 7rem);
  --radius-lg: 20px;
  --radius-sm: 8px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0e1816;
    --surface: #14211e;
    --ink: #e8efed;
    --muted: #9aaba6;
    --rule: #263532;
    --fibre: #3cc7c1;
    --fibre-soft: #173431;
    --splice: #f2c230;
    --danger: #ff8a80;
    --deep: #08100e;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0e1816;
  --surface: #14211e;
  --ink: #e8efed;
  --muted: #9aaba6;
  --rule: #263532;
  --fibre: #3cc7c1;
  --fibre-soft: #173431;
  --splice: #f2c230;
  --danger: #ff8a80;
  --deep: #08100e;
  color-scheme: dark;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font);
  font-size: var(--step-0);
  line-height: 1.6;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  font-feature-settings: "tnum" 0;
}

img { display: block; max-width: 100%; height: auto; }
a { color: inherit; }
ul, ol { padding: 0; list-style: none; }

:focus-visible {
  outline: 3px solid var(--fibre);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.skip {
  position: absolute;
  left: 1rem;
  top: -4rem;
  background: var(--ink);
  color: var(--paper);
  padding: 0.6rem 1rem;
  border-radius: var(--radius-sm);
  z-index: 100;
  text-decoration: none;
}
.skip:focus { top: 1rem; }

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

.section-title {
  font-size: var(--step-3);
  line-height: 1.1;
  font-weight: 700;
  letter-spacing: -0.015em;
}

/* ---------- Buttons & links ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  font: inherit;
  font-weight: 600;
  font-size: var(--step-0);
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background-color 0.2s, color 0.2s, border-color 0.2s;
}
.btn-primary { background: var(--ink); color: var(--paper); }
.btn-primary:hover { background: var(--fibre); }
.btn-quiet { border-color: var(--rule); color: var(--ink); background: transparent; }
.btn-quiet:hover { border-color: var(--ink); }

.text-link {
  display: inline-block;
  margin-top: 0.75rem;
  font-weight: 600;
  color: var(--fibre);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 2px;
}
.text-link:hover { color: var(--ink); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: saturate(1.4) blur(10px);
  -webkit-backdrop-filter: saturate(1.4) blur(10px);
  border-bottom: 1px solid var(--rule);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 4rem;
  gap: 1rem;
}
.wordmark {
  font-weight: 800;
  font-size: var(--step-1);
  letter-spacing: -0.02em;
  text-decoration: none;
}
.site-nav { display: flex; align-items: center; gap: 0.25rem; }
.site-nav a {
  text-decoration: none;
  font-size: var(--step--1);
  font-weight: 500;
  padding: 0.5rem 0.75rem;
  border-radius: 999px;
  color: var(--muted);
}
.site-nav a:hover { color: var(--ink); background: var(--fibre-soft); }
.site-nav .nav-cta {
  color: var(--ink);
  border: 1.5px solid var(--ink);
  margin-left: 0.5rem;
}
.site-nav .nav-cta:hover { background: var(--ink); color: var(--paper); }

.menu-toggle {
  display: none;
  font: inherit;
  font-weight: 600;
  font-size: var(--step--1);
  color: var(--ink);
  background: transparent;
  border: 1.5px solid var(--rule);
  border-radius: 999px;
  padding: 0.45rem 1rem;
  cursor: pointer;
}

/* ---------- Hero ---------- */
.hero { padding-block: clamp(2.5rem, 6vw, 5rem) var(--section); }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: center;
}
.hero-role {
  font-weight: 600;
  color: var(--fibre);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
}
.hero-role::before {
  content: "";
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 50%;
  background: var(--splice);
  box-shadow: 0 0 0 3px var(--fibre-soft);
}
.hero h1 {
  font-size: var(--step-4);
  line-height: 1.02;
  font-weight: 800;
  letter-spacing: -0.035em;
  max-width: 14ch;
  text-wrap: balance;
}
.lede {
  margin-top: 1.5rem;
  font-size: var(--step-1);
  line-height: 1.55;
  color: var(--muted);
  max-width: 36rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; }

.hero-portrait {
  justify-self: end;
  width: 100%;
  max-width: 24rem;
  position: relative;
}
.hero-portrait img {
  width: 100%;
  aspect-ratio: 2 / 3;
  object-fit: cover;
  border-radius: 999px 999px var(--radius-lg) var(--radius-lg);
  background: var(--rule);
}

/* ---------- What I do ---------- */
.areas { padding-bottom: var(--section); }
.fibre {
  position: relative;
  height: 24px;
  margin: 2.5rem 0 2rem;
}
.fibre svg { width: 100%; height: 100%; display: block; overflow: visible; }
.fibre-line {
  stroke: var(--fibre);
  stroke-width: 2;
  fill: none;
  stroke-dasharray: 1000;
  stroke-dashoffset: 0;
}
.splice {
  position: absolute;
  top: 50%;
  left: var(--x);
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--splice);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 6px var(--fibre);
  transform: translate(-50%, -50%);
}
.js .fibre-line { stroke-dashoffset: 1000; }
.js .splice { transform: translate(-50%, -50%) scale(0); }
.js .fibre.is-live .fibre-line { transition: stroke-dashoffset 1.4s cubic-bezier(.6,.05,.3,1); stroke-dashoffset: 0; }
.js .fibre.is-live .splice { transition: transform 0.35s cubic-bezier(.3,1.6,.5,1); transform: translate(-50%, -50%) scale(1); }
.js .fibre.is-live .splice:nth-of-type(1) { transition-delay: 0.35s; }
.js .fibre.is-live .splice:nth-of-type(2) { transition-delay: 0.8s; }
.js .fibre.is-live .splice:nth-of-type(3) { transition-delay: 1.2s; }

.area-list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1.25rem, 2.5vw, 2.5rem);
}
.area { text-align: center; min-width: 0; }
.area h3 { font-size: var(--step-1); font-weight: 700; letter-spacing: -0.01em; }
.area p { margin-top: 0.6rem; color: var(--muted); max-width: 34ch; margin-inline: auto; }
.tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 1rem;
}
.tags li {
  font-size: var(--step--1);
  padding: 0.2rem 0.65rem;
  border-radius: 999px;
  background: var(--fibre-soft);
  color: var(--ink);
}

/* ---------- Global teams ---------- */
.global { padding-bottom: var(--section); }
.global-intro { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr); gap: clamp(1.5rem, 4vw, 4rem); align-items: end; }
.global-intro p { color: var(--muted); max-width: 52ch; }
.route {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(1.25rem, 2.5vw, 2.5rem);
  margin-top: 3rem;
  padding-top: 2.25rem;
}
.route::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 6px;
  right: 0;
  height: 2px;
  background: var(--fibre);
}
.stop { position: relative; min-width: 0; }
.stop::before {
  content: "";
  position: absolute;
  top: calc(-2.25rem + 1px);
  left: 0;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--splice);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 6px var(--fibre);
}
.stop-place {
  font-size: var(--step-2);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}
.stop h3 { font-size: var(--step-0); font-weight: 600; color: var(--fibre); margin-top: 0.2rem; }
.stop > p:last-child { margin-top: 0.6rem; color: var(--muted); }

/* ---------- Experience ---------- */
.experience {
  padding-block: var(--section);
  background: var(--surface);
  border-block: 1px solid var(--rule);
}
.exp-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2.2fr);
  gap: clamp(2rem, 5vw, 5rem);
  align-items: start;
}
.exp-intro { position: sticky; top: 6rem; }
.exp-intro p { margin-top: 1rem; color: var(--muted); max-width: 26ch; }
.exp-intro a { color: var(--fibre); font-weight: 600; text-underline-offset: 0.2em; }

.timeline { position: relative; padding-left: 2.25rem; }
.timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: var(--fibre);
}
.role { position: relative; padding-bottom: 2.75rem; }
.role:last-child { padding-bottom: 0; }
.role::before {
  content: "";
  position: absolute;
  left: calc(-2.25rem + 7px);
  top: 0.4rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--splice);
  box-shadow: 0 0 0 4px var(--surface), 0 0 0 6px var(--fibre);
  transform: translateX(-50%);
}
.role-dates {
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--fibre);
  font-variant-numeric: tabular-nums;
}
.role h3 {
  font-size: var(--step-2);
  line-height: 1.2;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin-top: 0.2rem;
}
.role-org { color: var(--muted); margin-top: 0.15rem; }
.role > ul { margin-top: 0.85rem; display: grid; gap: 0.45rem; max-width: 62ch; }
.role > ul li { position: relative; padding-left: 1.1rem; }
.role > ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 0.45rem;
  height: 2px;
  background: var(--muted);
}

.role-more::before { background: var(--surface); }
.role-more details { border-top: 1px solid var(--rule); padding-top: 1rem; }
.role-more summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}
.role-more summary::-webkit-details-marker { display: none; }
.role-more summary::after {
  content: "+";
  font-weight: 500;
  font-size: 1.25em;
  line-height: 1;
  color: var(--fibre);
  transition: transform 0.2s;
}
.role-more details[open] summary::after { transform: rotate(45deg); }
.more-list { margin-top: 1rem; display: grid; gap: 0.6rem; color: var(--muted); }
.more-list strong { color: var(--ink); font-weight: 600; }

/* ---------- Projects ---------- */
.projects { padding-block: var(--section); }
.project-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1.5rem, 3vw, 2.5rem);
  margin-top: 2.5rem;
}
.project img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  object-position: top;
  border-radius: var(--radius-sm);
  border: 1px solid var(--rule);
  background: var(--surface);
}
.project-body { padding-top: 1.1rem; max-width: 60ch; }
.project-role { font-size: var(--step--1); font-weight: 600; color: var(--fibre); }
.project h3 { font-size: var(--step-2); font-weight: 700; letter-spacing: -0.015em; margin-top: 0.15rem; }
.project-body > p:not(.project-role) { margin-top: 0.5rem; color: var(--muted); }

.project-lead {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 3vw, 3rem);
  align-items: center;
}
.project-lead .project-body { padding-top: 0; }
.project-lead h3 { font-size: var(--step-3); line-height: 1.1; }

/* ---------- Credentials ---------- */
.credentials {
  padding-block: var(--section);
  border-top: 1px solid var(--rule);
}
.cred-grid {
  display: grid;
  grid-template-columns: 1.1fr 1.3fr 0.6fr;
  gap: clamp(1.5rem, 4vw, 3.5rem);
  margin-top: 2.5rem;
}
.cred-grid h3 {
  font-size: var(--step-1);
  font-weight: 700;
  padding-bottom: 0.75rem;
  border-bottom: 2px solid var(--fibre);
}
.cred-list { margin-top: 1rem; display: grid; gap: 0.8rem; }
.cred-list strong { display: block; font-weight: 600; line-height: 1.35; }
.cred-list span { display: block; color: var(--muted); font-size: var(--step--1); margin-top: 0.15rem; }

/* ---------- Contact ---------- */
.contact {
  padding-block: var(--section);
  background: var(--deep);
  color: var(--deep-ink);
  --rule: color-mix(in srgb, var(--deep-ink) 22%, transparent);
}
.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: start;
}
.contact-info > p {
  margin-top: 1rem;
  font-size: var(--step-1);
  opacity: 0.8;
  max-width: 32ch;
}
.contact-list { margin-top: 2rem; display: grid; gap: 0.15rem; }
.contact-list li {
  display: grid;
  grid-template-columns: 6rem 1fr;
  gap: 1rem;
  padding-block: 0.7rem;
  border-bottom: 1px solid var(--rule);
}
.contact-list span { opacity: 0.65; font-size: var(--step--1); padding-top: 0.15rem; }
.contact-list a { text-decoration: none; font-weight: 600; overflow-wrap: anywhere; }
.contact-list a:hover { text-decoration: underline; text-underline-offset: 0.2em; }
.contact :focus-visible { outline-color: var(--splice); }

.contact-form { display: grid; gap: 1.1rem; }
.field { display: grid; gap: 0.4rem; }
.field label { font-weight: 600; font-size: var(--step--1); }
.field input, .field textarea {
  font: inherit;
  color: var(--deep-ink);
  background: color-mix(in srgb, var(--deep-ink) 7%, transparent);
  border: 1.5px solid var(--rule);
  border-radius: var(--radius-sm);
  padding: 0.8rem 0.9rem;
  width: 100%;
}
.field textarea { resize: vertical; min-height: 9rem; }
.field input:focus, .field textarea:focus { outline: none; border-color: var(--splice); }
.field [aria-invalid="true"] { border-color: #ff8a80; }
.contact .btn-primary {
  background: var(--splice);
  color: #13201d;
  justify-self: start;
}
.contact .btn-primary:hover { background: var(--deep-ink); }
.contact .btn-primary[disabled] { opacity: 0.6; cursor: progress; }
.form-status { min-height: 1.6em; font-weight: 500; }
.form-status.is-error { color: #ff8a80; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--deep);
  color: var(--deep-ink);
  border-top: 1px solid color-mix(in srgb, var(--deep-ink) 15%, transparent);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-block: 1.5rem;
  font-size: var(--step--1);
  opacity: 0.75;
}
.footer-inner a { text-underline-offset: 0.2em; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-portrait { justify-self: start; max-width: 18rem; order: -1; }
  .exp-grid { grid-template-columns: 1fr; }
  .exp-intro { position: static; }
  .exp-intro p { max-width: 40ch; }
  .project-lead { grid-template-columns: 1fr; }
  .project-lead .project-body { padding-top: 0; }
  .cred-grid { grid-template-columns: 1fr 1fr; }
  .area-list { grid-template-columns: 1fr 1fr; row-gap: 2.5rem; }
  .fibre { display: none; }
  .global-intro { grid-template-columns: 1fr; }
  .route { grid-template-columns: 1fr 1fr; row-gap: 3.5rem; }
  .route::before { display: none; }
  .stop { border-top: 2px solid var(--fibre); padding-top: 1.25rem; }
  .stop::before { top: -7px; }
  .contact-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .menu-toggle { display: inline-block; }
  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 0.5rem var(--gutter) 1rem;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    display: none;
  }
  .site-nav.is-open { display: flex; }
  .hero-portrait { max-width: 12.5rem; }
  .site-nav a { padding: 0.85rem 0.25rem; border-radius: 0; font-size: var(--step-0); border-bottom: 1px solid var(--rule); }
  .site-nav .nav-cta { margin: 0.75rem 0 0; text-align: center; border-radius: 999px; }

  /* the fibre runs down the left on small screens */
  .fibre { display: none; }
  .area-list { grid-template-columns: 1fr; gap: 2rem; border-left: 2px solid var(--fibre); padding-left: 1.5rem; margin-top: 2rem; }
  .area { text-align: left; position: relative; }
  .area::before {
    content: "";
    position: absolute;
    left: calc(-1.5rem - 1px);
    top: 0.45rem;
    width: 12px; height: 12px;
    border-radius: 50%;
    background: var(--splice);
    box-shadow: 0 0 0 4px var(--paper), 0 0 0 6px var(--fibre);
    transform: translateX(-50%);
  }
  .area p { margin-inline: 0; }
  .tags { justify-content: flex-start; }

  .project-list { grid-template-columns: 1fr; }
  .route { grid-template-columns: 1fr; row-gap: 2rem; padding-top: 0; border-left: 2px solid var(--fibre); padding-left: 1.5rem; margin-top: 2rem; }
  .stop { border-top: 0; padding-top: 0; }
  .stop::before { top: 0.45rem; left: calc(-1.5rem - 1px); transform: translateX(-50%); }
  .cred-grid { grid-template-columns: 1fr; }
  .timeline { padding-left: 1.75rem; }
  .role::before { left: calc(-1.75rem + 7px); }
  .contact-list li { grid-template-columns: 5rem 1fr; }
  .footer-inner { flex-direction: column; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
  .js .fibre-line { stroke-dashoffset: 0; }
  .js .splice { transform: translate(-50%, -50%) scale(1); }
}