/* =============================================================================
   Jerwin Babatugon — Portfolio
   Single stylesheet. Layers: reset → tokens → base → layout → components →
   sections → utilities → motion/print.
   ========================================================================== */

/* ============================ 0. FONT =================================== */
/* Inter (variable, Latin subset) — SIL Open Font License 1.1. See assets/fonts/OFL.txt */
@font-face {
  font-family: "Inter";
  font-style: normal;
  font-display: swap;
  font-weight: 100 900;
  src: url("../fonts/inter-variable.woff2") format("woff2");
}

/* ============================ 1. RESET ==================================== */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; text-size-adjust: 100%; }
body { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
img, picture, svg, video, canvas { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
ul[role="list"], ol[role="list"] { list-style: none; padding: 0; }
:target { scroll-margin-top: calc(var(--header-h) + 1.5rem); }

/* ============================ 2. TOKENS ================================== */
:root {
  color-scheme: dark light;

  /* neutrals — dark baseline */
  --bg:            #0b0c0f;
  --bg-subtle:     #101218;
  --surface:       #16181f;
  --surface-2:     #1c1f28;
  --border:        #262a35;
  --border-strong: #333846;

  --text:       #e8eaef;
  --text-muted: #a6adba;
  --text-faint: #767d8b;

  --link:        #9aa0f7;
  --link-hover:  #b9bdfa;

  /* accent — Iris indigo */
  --accent:          #6d76f2;
  --accent-hover:    #838bf5;
  --accent-press:    #5b63e0;
  --accent-contrast: #ffffff;
  --accent-subtle:   rgba(109, 118, 242, 0.12);
  --accent-line:     rgba(109, 118, 242, 0.32);
  --focus-ring:      rgba(131, 139, 245, 0.60);

  /* status */
  --ok:       #46b06a;
  --dev:      #d8a531;
  --dev-bg:   rgba(216, 165, 49, 0.13);
  --info:     #5aa2f2;

  /* typography */
  --font-sans: "Inter", "Inter var", system-ui, -apple-system, "Segoe UI",
               Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
               "Liberation Mono", monospace;

  --fs-hero: clamp(2.35rem, 1.7rem + 3vw, 3.6rem);
  --fs-h2:   clamp(1.8rem, 1.45rem + 1.7vw, 2.5rem);
  --fs-h3:   clamp(1.3rem, 1.18rem + 0.6vw, 1.55rem);
  --fs-lg:   1.125rem;
  --fs-base: 1rem;
  --fs-sm:   0.9375rem;
  --fs-xs:   0.8125rem;

  --lh-tight: 1.15;
  --lh-snug:  1.35;
  --lh-body:  1.65;
  --tracking-tight: -0.02em;

  /* spacing — 4pt base */
  --s-1: 0.25rem; --s-2: 0.5rem;  --s-3: 0.75rem; --s-4: 1rem;
  --s-5: 1.5rem;  --s-6: 2rem;    --s-7: 3rem;    --s-8: 4rem;
  --s-9: 6rem;    --s-10: 8rem;

  /* shape */
  --radius-sm: 8px;
  --radius:    12px;
  --radius-lg: 18px;
  --radius-pill: 999px;

  /* elevation */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.30);
  --shadow-md: 0 10px 30px -12px rgba(0, 0, 0, 0.50);
  --shadow-lg: 0 24px 60px -20px rgba(0, 0, 0, 0.55);

  /* layout */
  --container: 1120px;
  --container-narrow: 780px;
  --header-h: 64px;
  --section-y: clamp(3.5rem, 2rem + 7vw, 6.5rem);

  --transition: 180ms ease;

  --z-header: 100;
  --z-menu:   200;
  --z-skip:   300;
}

/* light theme — explicit choice */
:root[data-theme="light"] {
  --bg:            #ffffff;
  --bg-subtle:     #f6f7f9;
  --surface:       #ffffff;
  --surface-2:     #f1f3f6;
  --border:        #e3e6eb;
  --border-strong: #d0d5dd;

  --text:       #1a1d24;
  --text-muted: #515863;
  --text-faint: #7b828d;

  --link:       #4a42d4;
  --link-hover: #372fc0;

  --accent:        #4f47d6;
  --accent-hover:  #423ac7;
  --accent-press:  #372fb4;
  --accent-subtle: rgba(79, 71, 214, 0.10);
  --accent-line:   rgba(79, 71, 214, 0.28);
  --focus-ring:    rgba(79, 71, 214, 0.55);

  --dev:    #9a6b12;
  --dev-bg: rgba(216, 165, 49, 0.16);

  --shadow-sm: 0 1px 2px rgba(20, 23, 31, 0.08);
  --shadow-md: 0 10px 30px -14px rgba(20, 23, 31, 0.18);
  --shadow-lg: 0 24px 60px -24px rgba(20, 23, 31, 0.20);
}

/* light theme — system default (only when user hasn't forced dark) */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg:            #ffffff;
    --bg-subtle:     #f6f7f9;
    --surface:       #ffffff;
    --surface-2:     #f1f3f6;
    --border:        #e3e6eb;
    --border-strong: #d0d5dd;

    --text:       #1a1d24;
    --text-muted: #515863;
    --text-faint: #7b828d;

    --link:       #4a42d4;
    --link-hover: #372fc0;

    --accent:        #4f47d6;
    --accent-hover:  #423ac7;
    --accent-press:  #372fb4;
    --accent-subtle: rgba(79, 71, 214, 0.10);
    --accent-line:   rgba(79, 71, 214, 0.28);
    --focus-ring:    rgba(79, 71, 214, 0.55);

    --dev:    #9a6b12;
    --dev-bg: rgba(216, 165, 49, 0.16);

    --shadow-sm: 0 1px 2px rgba(20, 23, 31, 0.08);
    --shadow-md: 0 10px 30px -14px rgba(20, 23, 31, 0.18);
    --shadow-lg: 0 24px 60px -24px rgba(20, 23, 31, 0.20);
  }
}

/* ============================ 3. BASE =================================== */
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  background-color: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: var(--fs-base);
  line-height: var(--lh-body);
  font-feature-settings: "cv05" 1, "cv08" 1, "ss03" 1;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  color: var(--text);
  line-height: var(--lh-tight);
  letter-spacing: var(--tracking-tight);
  font-weight: 650;
  text-wrap: balance;
}

p { text-wrap: pretty; }

a.inline-link {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  transition: color var(--transition);
}
a.inline-link:hover { color: var(--link-hover); }

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

/* icon system — sprite is inlined in <body> on each page (see #icon-sprite);
   use: <svg class="icon"><use href="#i-name"></use></svg> — works under file:// too */
.icon {
  width: 1em; height: 1em;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  vertical-align: middle;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* custom scrollbar (progressive) */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: var(--radius-pill);
  border: 3px solid var(--bg);
}

/* ============================ 4. LAYOUT ================================= */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.1rem, 0.6rem + 2.5vw, 2rem);
}

.section { padding-block: var(--section-y); }
.section--tint { background: var(--bg-subtle); }
.section--border { border-block: 1px solid var(--border); }

.section__head {
  max-width: 46rem;
  margin-bottom: clamp(2rem, 1rem + 4vw, 3.5rem);
}
.section__head--center { margin-inline: auto; text-align: center; }

.section__eyebrow {
  display: inline-block;
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--s-3);
}
.section__title { font-size: var(--fs-h2); }
.section__subtitle {
  margin-top: var(--s-4);
  font-size: var(--fs-lg);
  color: var(--text-muted);
  line-height: var(--lh-snug);
}

.grid { display: grid; gap: var(--s-5); }
.stack > * + * { margin-top: var(--s-4); }

/* ============================ 5. COMPONENTS ============================ */

/* --- buttons --- */
.btn {
  --_bg: var(--surface-2);
  --_fg: var(--text);
  --_bd: var(--border-strong);
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 0.72rem 1.15rem;
  border-radius: var(--radius);
  border: 1px solid var(--_bd);
  background: var(--_bg);
  color: var(--_fg);
  font-size: var(--fs-sm);
  font-weight: 560;
  line-height: 1;
  white-space: nowrap;
  transition: transform var(--transition), background var(--transition),
              border-color var(--transition), box-shadow var(--transition);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn .btn__icon { width: 1.05em; height: 1.05em; flex: none; }

.btn--primary {
  --_bg: var(--accent);
  --_fg: var(--accent-contrast);
  --_bd: transparent;
  box-shadow: 0 1px 0 rgba(255,255,255,0.08) inset, var(--shadow-sm);
}
.btn--primary:hover { --_bg: var(--accent-hover); }
.btn--primary:active { --_bg: var(--accent-press); }

.btn--secondary { --_bg: transparent; --_bd: var(--border-strong); }
.btn--secondary:hover { --_bd: var(--accent); background: var(--accent-subtle); }

.btn--ghost { --_bg: transparent; --_bd: transparent; padding-inline: 0.5rem; }
.btn--ghost:hover { color: var(--accent); }

.btn--sm { padding: 0.5rem 0.8rem; font-size: var(--fs-xs); }
.btn--block { width: 100%; justify-content: center; }

/* --- link row (social / resume) --- */
.link-row { display: flex; flex-wrap: wrap; gap: var(--s-2); align-items: center; }
.link-row a {
  display: inline-flex;
  align-items: center;
  gap: var(--s-2);
  padding: 0.45rem 0.7rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  font-size: var(--fs-xs);
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
}
.link-row a:hover { color: var(--text); border-color: var(--border-strong); background: var(--surface-2); }
.link-row svg { width: 1.05rem; height: 1.05rem; }

/* --- chips / tags --- */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.34rem 0.66rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: var(--fs-xs);
  font-weight: 500;
  line-height: 1;
}
.chip--accent { border-color: var(--accent-line); color: var(--text); background: var(--accent-subtle); }

.chip-set { display: flex; flex-wrap: wrap; gap: 0.5rem; }

/* --- badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.32rem 0.6rem;
  border-radius: var(--radius-pill);
  font-size: var(--fs-xs);
  font-weight: 600;
  letter-spacing: 0.01em;
}
.badge--dev { background: var(--dev-bg); color: var(--dev); border: 1px solid color-mix(in srgb, var(--dev) 40%, transparent); }
.badge--dev::before {
  content: ""; width: 0.5rem; height: 0.5rem; border-radius: 50%;
  background: var(--dev);
}

/* --- card --- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--s-5);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.card--link:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.card__title { font-size: var(--fs-h3); margin-bottom: var(--s-3); }
.card__text { color: var(--text-muted); font-size: var(--fs-sm); }
.card__icon {
  display: grid; place-items: center;
  width: 2.6rem; height: 2.6rem;
  border-radius: var(--radius);
  background: var(--accent-subtle);
  color: var(--accent);
  margin-bottom: var(--s-4);
}
.card__icon svg { width: 1.35rem; height: 1.35rem; }

/* --- timeline --- */
.timeline { position: relative; display: grid; gap: var(--s-6); }
.timeline::before {
  content: "";
  position: absolute;
  left: 7px; top: 6px; bottom: 6px;
  width: 2px;
  background: var(--border);
}
.timeline__item { position: relative; padding-left: 2.25rem; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: 0; top: 5px;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--surface);
  border: 2px solid var(--border-strong);
}
.timeline__item--current::before { background: var(--accent); border-color: var(--accent); }
.timeline__role { font-size: var(--fs-h3); }
.timeline__org { color: var(--text); font-weight: 560; }
.timeline__meta {
  display: flex; flex-wrap: wrap; gap: 0.35rem 0.9rem;
  color: var(--text-faint);
  font-size: var(--fs-xs);
  margin: 0.35rem 0 0.9rem;
}
.timeline__list { color: var(--text-muted); font-size: var(--fs-sm); padding-left: 1.1rem; }
.timeline__list li { margin-bottom: 0.4rem; }
.timeline__list li::marker { color: var(--text-faint); }
.timeline__tags { margin-top: var(--s-4); }

/* --- skills groups --- */
.skill-groups { display: grid; gap: var(--s-5); grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.skill-group { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: var(--s-5); }
.skill-group__label {
  display: flex; align-items: center; gap: var(--s-3);
  font-size: var(--fs-sm); font-weight: 620; color: var(--text);
  margin-bottom: var(--s-4);
}
.skill-group__label svg { width: 1.15rem; height: 1.15rem; color: var(--accent); }
.skill-note { margin-top: var(--s-5); color: var(--text-faint); font-size: var(--fs-xs); }

/* --- tech chips (icon + label), with a staggered reveal and a hover "wake up" --- */
.tech-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.7rem 0.35rem 0.4rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-muted);
  font-size: var(--fs-xs);
  font-weight: 520;
  line-height: 1;
  transition: transform 220ms cubic-bezier(.16,1,.3,1), border-color 220ms ease,
              background 220ms ease, color 220ms ease, box-shadow 220ms ease;
}
.tech-chip__icon {
  display: grid;
  place-items: center;
  width: 1.5rem;
  height: 1.5rem;
  flex: none;
  padding: 2px;
  border-radius: 7px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  color: var(--text-faint);
}
.tech-chip__icon svg {
  width: 100%;
  height: 100%;
  transition: transform 320ms cubic-bezier(.34,1.56,.64,1), filter 260ms ease;
}
.tech-chip:hover,
.tech-chip:focus-within {
  transform: translateY(-3px);
  border-color: var(--accent-line);
  background: var(--surface-2);
  color: var(--text);
  box-shadow: var(--shadow-sm);
}
.tech-chip:hover .tech-chip__icon,
.tech-chip:focus-within .tech-chip__icon {
  border-color: var(--accent-line);
  background: var(--bg);
}
.tech-chip:hover .tech-chip__icon svg,
.tech-chip:focus-within .tech-chip__icon svg {
  transform: scale(1.18) rotate(-6deg);
  filter: drop-shadow(0 2px 6px rgba(0,0,0,.35));
}

/* staggered pop-in, once the parent .skill-group has been revealed.
   --stagger is set per position below; it's read inside the higher-specificity
   rule so the `animation` shorthand there can't silently reset the delay to 0. */
:root.js .tech-chip { opacity: 0; transform: translateY(10px) scale(.94); }
@keyframes tech-chip-in { to { opacity: 1; transform: none; } }
:root.js .skill-group.is-visible .tech-chip {
  animation: tech-chip-in 460ms cubic-bezier(.16,1,.3,1) both;
  animation-delay: calc(var(--stagger, 0) * 35ms);
}
.chip-set .tech-chip:nth-child(1)  { --stagger: 0; }
.chip-set .tech-chip:nth-child(2)  { --stagger: 1; }
.chip-set .tech-chip:nth-child(3)  { --stagger: 2; }
.chip-set .tech-chip:nth-child(4)  { --stagger: 3; }
.chip-set .tech-chip:nth-child(5)  { --stagger: 4; }
.chip-set .tech-chip:nth-child(6)  { --stagger: 5; }
.chip-set .tech-chip:nth-child(7)  { --stagger: 6; }
.chip-set .tech-chip:nth-child(8)  { --stagger: 7; }
.chip-set .tech-chip:nth-child(9)  { --stagger: 8; }
.chip-set .tech-chip:nth-child(10) { --stagger: 9; }
.chip-set .tech-chip:nth-child(11) { --stagger: 10; }

/* --- stepper (process) --- */
.stepper { display: grid; gap: var(--s-4); grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); counter-reset: step; }
.step {
  position: relative;
  padding: var(--s-5) var(--s-4) var(--s-4);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}
.step::before {
  counter-increment: step;
  content: counter(step);
  position: absolute; top: -0.9rem; left: var(--s-4);
  display: grid; place-items: center;
  width: 1.8rem; height: 1.8rem;
  font-size: var(--fs-xs); font-weight: 700;
  color: var(--accent-contrast); background: var(--accent);
  border-radius: 50%;
}
.step__name { font-weight: 620; font-size: var(--fs-sm); margin-bottom: 0.3rem; }
.step__text { color: var(--text-muted); font-size: var(--fs-xs); }

/* --- pipeline (featured project) --- */
.pipeline { display: grid; gap: var(--s-3); }
.pipeline__row { display: flex; flex-wrap: wrap; gap: var(--s-2); align-items: center; }
.pipeline__node {
  display: inline-flex; align-items: center; gap: 0.45rem;
  padding: 0.5rem 0.8rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  font-size: var(--fs-xs); font-weight: 550;
}
.pipeline__node--built { border-color: var(--accent); background: var(--accent-subtle); color: var(--text); }
.pipeline__node--planned { border-style: dashed; color: var(--text-faint); }
.pipeline__arrow { color: var(--text-faint); flex: none; }
.pipeline__legend { display: flex; gap: var(--s-4); flex-wrap: wrap; font-size: var(--fs-xs); color: var(--text-faint); margin-top: var(--s-3); }
.pipeline__legend span { display: inline-flex; align-items: center; gap: 0.4rem; }
.pipeline__swatch { width: 0.9rem; height: 0.9rem; border-radius: 3px; border: 1px solid var(--border-strong); }
.pipeline__swatch--built { background: var(--accent-subtle); border-color: var(--accent); }
.pipeline__swatch--planned { border-style: dashed; }

.status-cols { display: grid; gap: var(--s-4); grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); margin-top: var(--s-6); }
.status-col { border: 1px solid var(--border); border-radius: var(--radius); padding: var(--s-4); background: var(--surface); }
.status-col h4 { font-size: var(--fs-sm); margin-bottom: var(--s-3); display: flex; align-items: center; gap: 0.5rem; }
.status-col--built h4::before,
.status-col--progress h4::before,
.status-col--planned h4::before { content: ""; width: 0.6rem; height: 0.6rem; border-radius: 50%; }
.status-col--built h4::before { background: var(--ok); }
.status-col--progress h4::before { background: var(--dev); }
.status-col--planned h4::before { background: var(--text-faint); }
.status-col ul { list-style: none; display: grid; gap: 0.5rem; }
.status-col li { color: var(--text-muted); font-size: var(--fs-xs); padding-left: 1rem; position: relative; }
.status-col li::before { content: "–"; position: absolute; left: 0; color: var(--text-faint); }

/* --- gallery (scroll-snap, no JS lib) --- */
.gallery { position: relative; }
.gallery__track {
  display: flex; gap: var(--s-4);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  padding-bottom: var(--s-3);
  scrollbar-width: none;
}
.gallery__track::-webkit-scrollbar { display: none; }
.gallery__track > figure {
  flex: 0 0 min(100%, 640px);
  scroll-snap-align: start;
}
.gallery__track img {
  width: 100%; border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--surface-2);
}
.gallery__track figcaption { margin-top: var(--s-2); font-size: var(--fs-xs); color: var(--text-faint); }
.gallery__nav { display: flex; gap: var(--s-2); margin-top: var(--s-3); }
.gallery__nav button {
  display: grid; place-items: center;
  width: 2.2rem; height: 2.2rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition);
}
.gallery__nav button:hover { color: var(--text); border-color: var(--accent); }
.gallery__nav svg { width: 1.1rem; height: 1.1rem; }

/* --- form --- */
.field { display: grid; gap: 0.4rem; }
.field__label { font-size: var(--fs-xs); font-weight: 600; color: var(--text-muted); }
.field__input {
  width: 100%;
  padding: 0.7rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}
.field__input::placeholder { color: var(--text-faint); }
.field__input:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--focus-ring);
}
.field__input[aria-invalid="true"] { border-color: #d9534f; }
.field__error { font-size: var(--fs-xs); color: #e06b67; min-height: 1em; }
.form-row { display: grid; gap: var(--s-4); }
@media (min-width: 620px) { .form-row--2 { grid-template-columns: 1fr 1fr; } }
.form-status {
  font-size: var(--fs-sm);
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}
.form-status[data-state="ok"] { color: var(--ok); border-color: color-mix(in srgb, var(--ok) 40%, transparent); background: color-mix(in srgb, var(--ok) 10%, transparent); }
.form-status[data-state="error"] { color: #e06b67; border-color: rgba(224,107,103,0.4); background: rgba(224,107,103,0.08); }
.hp-field { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }

/* ============================ 6. SITE CHROME ========================== */

.skip-link {
  position: fixed; top: 0.5rem; left: 0.5rem;
  z-index: var(--z-skip);
  padding: 0.6rem 1rem;
  background: var(--accent); color: var(--accent-contrast);
  border-radius: var(--radius-sm);
  transform: translateY(-160%);
  transition: transform var(--transition);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: sticky; top: 0;
  z-index: var(--z-header);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), background var(--transition);
}
.site-header[data-scrolled="true"] {
  border-bottom-color: var(--border);
  background: color-mix(in srgb, var(--bg) 92%, transparent);
}
.site-header__inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--s-4);
}
.brand {
  font-weight: 700; font-size: 1.05rem; letter-spacing: -0.02em;
  display: inline-flex; align-items: center; gap: 0.5rem;
}
.brand__mark {
  display: grid; place-items: center;
  width: 1.8rem; height: 1.8rem;
  border-radius: 7px;
  background: var(--accent); color: var(--accent-contrast);
  font-size: 0.95rem;
}

.nav { display: flex; align-items: center; gap: var(--s-2); }
.nav__list { display: flex; align-items: center; gap: 0.35rem; list-style: none; }
.nav__link {
  padding: 0.5rem 0.7rem;
  border-radius: var(--radius-sm);
  font-size: var(--fs-sm);
  color: var(--text-muted);
  transition: color var(--transition), background var(--transition);
}
.nav__link:hover { color: var(--text); }
.nav__link[aria-current="true"] { color: var(--text); background: var(--surface-2); }

.header-actions { display: flex; align-items: center; gap: var(--s-2); }

.theme-toggle {
  display: grid; place-items: center;
  width: 2.3rem; height: 2.3rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition);
}
.theme-toggle:hover { color: var(--text); border-color: var(--border-strong); }
.theme-toggle svg { width: 1.15rem; height: 1.15rem; }
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

.nav-toggle { display: none; width: 2.3rem; height: 2.3rem; place-items: center; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-muted); }
.nav-toggle svg { width: 1.3rem; height: 1.3rem; }

@media (max-width: 860px) {
  .nav-toggle { display: grid; }
  .nav {
    position: fixed;
    inset: var(--header-h) 0 auto 0;
    flex-direction: column;
    align-items: stretch;
    gap: var(--s-4);
    padding: var(--s-5);
    background: var(--bg);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-lg);
    transform: translateY(-120%);
    transition: transform 220ms ease;
    z-index: var(--z-menu);
  }
  .nav[data-open="true"] { transform: translateY(0); }
  .nav__list { flex-direction: column; align-items: stretch; gap: 0.15rem; }
  .nav__link { padding: 0.8rem 0.7rem; font-size: var(--fs-base); }
  .nav .btn { justify-content: center; }
  .nav__cta-desktop { display: none; }
}
@media (min-width: 861px) {
  .nav__cta-mobile { display: none; }
}

/* ============================ 7. SECTIONS ============================= */

/* --- hero --- */
.hero { padding-block: clamp(3rem, 1.5rem + 8vw, 6.5rem) var(--section-y); position: relative; }
.hero::before {
  content: "";
  position: absolute; inset: 0;
  background:
    radial-gradient(60ch 40ch at 15% -10%, var(--accent-subtle), transparent 70%);
  pointer-events: none;
}
.hero__grid {
  position: relative;
  display: grid;
  gap: clamp(2rem, 1rem + 5vw, 4rem);
  align-items: center;
}
@media (min-width: 900px) {
  .hero__grid { grid-template-columns: 1.35fr 0.9fr; }
}
.hero__status {
  display: inline-flex; align-items: center; gap: 0.5rem;
  padding: 0.4rem 0.8rem;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: var(--fs-xs); color: var(--text-muted);
  margin-bottom: var(--s-5);
}
.hero__status::before {
  content: ""; width: 0.5rem; height: 0.5rem; border-radius: 50%;
  background: var(--ok);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 25%, transparent);
}
.hero__title { font-size: var(--fs-hero); font-weight: 680; }
.hero__title .accent { color: var(--accent); }
.hero__lead {
  margin-top: var(--s-5);
  font-size: var(--fs-lg);
  color: var(--text-muted);
  max-width: 40ch;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: var(--s-3); margin-top: var(--s-6); }
.hero__links { margin-top: var(--s-6); }

.hero__portrait {
  position: relative;
  justify-self: center;
  width: min(320px, 80%);
  aspect-ratio: 4 / 5;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}
.hero__portrait img { width: 100%; height: 100%; object-fit: cover; }

/* --- about --- */
.about__grid { display: grid; gap: var(--s-6); }
@media (min-width: 820px) { .about__grid { grid-template-columns: 1.5fr 1fr; } }
.about__body p { color: var(--text-muted); }
.about__body p + p { margin-top: var(--s-4); }
.about__aside { display: grid; gap: var(--s-3); align-content: start; }
.about__fact {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: var(--s-4);
  background: var(--surface);
}
.about__fact dt { font-size: var(--fs-xs); color: var(--text-faint); margin-bottom: 0.2rem; }
.about__fact dd { font-size: var(--fs-sm); color: var(--text); font-weight: 550; }

/* --- projects --- */
.projects__grid { display: grid; gap: var(--s-5); grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.project-card { display: flex; flex-direction: column; overflow: hidden; padding: 0; }
.project-card__media {
  position: relative;
  aspect-ratio: 16 / 11;
  background: var(--surface-2);
  border-bottom: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}
.project-card__media img {
  position: absolute; inset: 0;
  z-index: 0;
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 420ms ease;
}
.card--link:hover .project-card__media img { transform: scale(1.04); }
/* scrim: keeps the overlaid title/chips readable over any screenshot — must
   out-rank the image explicitly, since both are position:absolute with no
   z-index would otherwise just paint in DOM order (image on top, hiding it). */
.project-card__media::before {
  content: "";
  position: absolute; inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(6,7,10,.05) 0%, rgba(6,7,10,.35) 45%, rgba(6,7,10,.92) 100%);
}
.project-card__badge { position: absolute; top: var(--s-3); left: var(--s-3); z-index: 3; }
.project-card__overlay {
  position: relative;
  z-index: 2;
  padding: var(--s-4) var(--s-5);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.project-card__title {
  font-size: var(--fs-h3);
  color: #fff;
  text-shadow: 0 1px 3px rgba(0,0,0,.5);
}
.project-card__overlay .chip-set { gap: 0.4rem; }
.project-card__overlay .chip {
  background: rgba(15,16,20,.55);
  border-color: rgba(255,255,255,.28);
  color: #f1f2f5;
  backdrop-filter: blur(3px);
  -webkit-backdrop-filter: blur(3px);
}
.project-card__body { padding: var(--s-5); display: flex; flex-direction: column; gap: var(--s-3); flex: 1; }
.project-card__text { color: var(--text-muted); font-size: var(--fs-sm); flex: 1; }
.project-card__foot { display: flex; align-items: center; gap: var(--s-3); margin-top: auto; padding-top: var(--s-3); }
.project-card__foot .arrow { transition: transform var(--transition); }
.card--link:hover .project-card__foot .arrow { transform: translateX(3px); }

/* --- automation --- */
.connects { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: var(--s-7); }

/* --- services --- */
.services__grid { display: grid; gap: var(--s-4); grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }

/* --- featured --- */
.featured__inner {
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: clamp(1.5rem, 1rem + 3vw, 3rem);
  background:
    linear-gradient(180deg, var(--accent-subtle), transparent 40%),
    var(--surface);
}
.featured__head { display: flex; flex-wrap: wrap; align-items: center; gap: var(--s-3); margin-bottom: var(--s-4); }
.featured__title { font-size: var(--fs-h2); }
.featured__lead { color: var(--text-muted); max-width: 60ch; margin-bottom: var(--s-6); }
.featured__diagram {
  overflow-x: auto;
  padding: var(--s-5);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  margin-bottom: var(--s-5);
}

/* --- cta band --- */
.cta-band { text-align: center; }
.cta-band__inner {
  max-width: 46rem; margin-inline: auto;
  border: 1px solid var(--accent-line);
  border-radius: var(--radius-lg);
  padding: clamp(2rem, 1rem + 5vw, 3.5rem);
  background: var(--accent-subtle);
}
.cta-band__title { font-size: var(--fs-h2); }
.cta-band__text { margin: var(--s-4) auto var(--s-6); color: var(--text-muted); max-width: 44ch; }

/* --- contact --- */
.contact__grid { display: grid; gap: var(--s-7); }
@media (min-width: 860px) { .contact__grid { grid-template-columns: 0.9fr 1.1fr; } }
.contact__methods { display: grid; gap: var(--s-4); align-content: start; }
.contact__method { display: flex; gap: var(--s-4); align-items: flex-start; }
.contact__method .card__icon { margin-bottom: 0; flex: none; }
.contact__method h3 { font-size: var(--fs-sm); }
.contact__method a, .contact__method span { color: var(--text-muted); font-size: var(--fs-sm); }
.contact__method a:hover { color: var(--link-hover); }

/* --- footer --- */
.site-footer { border-top: 1px solid var(--border); background: var(--bg-subtle); padding-block: var(--s-7); }
.site-footer__grid { display: grid; gap: var(--s-6); }
@media (min-width: 720px) { .site-footer__grid { grid-template-columns: 1.4fr 1fr 1fr; } }
.site-footer__brand p { color: var(--text-faint); font-size: var(--fs-sm); margin-top: var(--s-3); max-width: 32ch; }
.site-footer h4 { font-size: var(--fs-xs); text-transform: uppercase; letter-spacing: 0.07em; color: var(--text-faint); margin-bottom: var(--s-3); }
.site-footer__links { display: grid; gap: 0.5rem; list-style: none; }
.site-footer__links a { color: var(--text-muted); font-size: var(--fs-sm); }
.site-footer__links a:hover { color: var(--text); }
.site-footer__bottom {
  display: flex; flex-wrap: wrap; gap: var(--s-3); justify-content: space-between; align-items: center;
  margin-top: var(--s-6); padding-top: var(--s-5);
  border-top: 1px solid var(--border);
  color: var(--text-faint); font-size: var(--fs-xs);
}
.site-footer__socials { display: flex; gap: var(--s-2); }
.site-footer__socials a { display: grid; place-items: center; width: 2rem; height: 2rem; border: 1px solid var(--border); border-radius: var(--radius-sm); color: var(--text-muted); }
.site-footer__socials a:hover { color: var(--text); border-color: var(--border-strong); }
.site-footer__socials svg { width: 1.05rem; height: 1.05rem; }

/* --- sub-page hero (automation / projects) --- */
.subhero { padding-block: clamp(2.5rem, 1.5rem + 6vw, 4.5rem) var(--section-y); }
.subhero__back { display: inline-flex; align-items: center; gap: 0.4rem; color: var(--text-faint); font-size: var(--fs-xs); margin-bottom: var(--s-4); }
.subhero__back:hover { color: var(--text); }
.subhero__back svg { width: 0.95rem; height: 0.95rem; }
.subhero__title { font-size: var(--fs-hero); }
.subhero__lead { margin-top: var(--s-4); font-size: var(--fs-lg); color: var(--text-muted); max-width: 62ch; }
.subhero__meta { display: flex; flex-wrap: wrap; gap: 0.4rem 0.9rem; margin-top: var(--s-5); color: var(--text-faint); font-size: var(--fs-xs); }

/* --- case study prose --- */
.case { display: grid; gap: var(--s-7); }
.case__block h2 { font-size: var(--fs-h3); margin-bottom: var(--s-4); }
.case__block p { color: var(--text-muted); }
.case__block p + p { margin-top: var(--s-4); }
.case__block ul { color: var(--text-muted); font-size: var(--fs-sm); padding-left: 1.2rem; display: grid; gap: 0.5rem; }
.case__links { display: flex; flex-wrap: wrap; gap: var(--s-3); }
.note {
  border-left: 3px solid var(--accent);
  padding: 0.6rem 0 0.6rem 1rem;
  color: var(--text-muted);
  font-size: var(--fs-sm);
  background: var(--accent-subtle);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

/* ============================ 8. UTILITIES =========================== */
.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0);
  white-space: nowrap; border: 0;
}
.text-muted { color: var(--text-muted); }
.center { text-align: center; }
.mt-0 { margin-top: 0; }
.flow > * + * { margin-top: var(--s-4); }

/* reveal on scroll — only hidden when JS is present (progressive enhancement) */
:root.js .reveal { opacity: 0; transform: translateY(16px); transition: opacity 500ms ease, transform 500ms ease; }
:root.js .reveal.is-visible { opacity: 1; transform: none; }

/* ============================ 9. MOTION / PRINT ===================== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  :root.js .reveal, :root.js .reveal.is-visible { opacity: 1; transform: none; transition: none; }
}

@media print {
  .site-header, .site-footer, .cta-band, .hero__cta, .theme-toggle, .nav-toggle { display: none; }
  body { background: #fff; color: #000; }
  a { color: #000; text-decoration: underline; }
}