/* ==========================================================================
   Srlaya Studio — design system
   Dark-first "Carbon Navy" brand · faceted geometry · Eindhoven Yellow accent
   Space Grotesk + Space Mono. Tokens drawn from the brand handoff.
   ========================================================================== */

/* ---- Design tokens (DARK is the brand default) --------------------------- */
:root {
  --bg:            #0a0f18;   /* Carbon Navy */
  --bg-deep:       #06090f;
  --surface:       #0e1420;   /* Navy Panel */
  --surface-2:     #15202f;   /* Slate Surface */
  --border:        rgba(233, 231, 224, 0.10);
  --border-strong: rgba(233, 231, 224, 0.20);
  --text:          #f4f1ea;
  --text-2:        #e9e7e0;
  --muted:         #9aa2b2;
  --faint:         #7e8799;
  --accent:        #f2be3c;   /* Eindhoven Yellow */
  --accent-ink:    #0a0f18;   /* text on yellow */
  --seam:          #6b7c92;
  --facet-hi:      #3c5070;
  --facet-mid:     #2a3a4f;
  --facet-dark:    #19222e;

  /* Discipline secondaries */
  --c-dev:      #6e8ac0;
  --c-design:   #c98e6a;
  --c-data:     #6ba89b;
  --c-academic: #9385c0;

  --shadow: 0 24px 50px rgba(0, 0, 0, 0.45);

  --font-display: "Space Grotesk", system-ui, -apple-system, sans-serif;
  --font-mono: "Space Mono", ui-monospace, "SF Mono", monospace;

  --fs-display: clamp(2.6rem, 1.2rem + 5.4vw, 5.2rem);
  --fs-h2:      clamp(1.7rem, 1.1rem + 2.2vw, 3rem);
  --fs-h3:      clamp(1.2rem, 1rem + 0.7vw, 1.5rem);
  --fs-lead:    clamp(1.1rem, 1rem + 0.5vw, 1.35rem);
  --fs-body:    1.0625rem;
  --fs-small:   0.9375rem;
  --fs-meta:    0.75rem;

  --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;     --space-10: 8rem;

  --radius: 12px;
  --radius-sm: 4px;
  --maxw: 74rem;
  --maxw-text: 46rem;
}

/* ---- Light "Paper" variant ----------------------------------------------- */
:root[data-theme="light"] {
  --bg:            #f3f0e9;   /* Paper */
  --bg-deep:       #e9e5db;
  --surface:       #fbfaf6;
  --surface-2:     #ece8df;
  --border:        rgba(18, 22, 29, 0.12);
  --border-strong: rgba(18, 22, 29, 0.22);
  --text:          #12161d;   /* Ink */
  --text-2:        #1d2229;
  --muted:         #545b66;
  --faint:         #6e7689;
  --accent:        #b9881f;   /* yellow on light (darkened for AA text contrast) */
  --accent-ink:    #f3f0e9;
  --seam:          #c9cdd6;
  --shadow: 0 18px 40px rgba(18, 22, 29, 0.10);
}

/* ---- Reset / base --------------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-2);
  font-family: var(--font-display);
  font-size: var(--fs-body);
  font-weight: 400;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: -0.03em;
  margin: 0;
  color: var(--text);
}
p { margin: 0; }
a { color: inherit; }
img { max-width: 100%; height: auto; display: block; }

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

/* ---- Layout helpers ------------------------------------------------------- */
.wrap { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: var(--space-5); }
.section { padding-block: var(--space-9); border-top: 1px solid var(--border); }

.eyebrow, .sec-index {
  font-family: var(--font-mono);
  font-size: var(--fs-meta);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 var(--space-4);
}
.sec-index { color: var(--faint); }
.sec-index b { color: var(--accent); font-weight: 400; }

.section-head { margin-bottom: var(--space-7); max-width: var(--maxw-text); }
.section-head h2 { font-size: var(--fs-h2); }
.section-head p { margin-top: var(--space-3); color: var(--muted); font-size: var(--fs-lead); font-weight: 300; }

.skip-link {
  position: absolute; left: var(--space-4); top: -100%;
  background: var(--accent); color: var(--accent-ink);
  padding: var(--space-2) var(--space-4); border-radius: var(--radius-sm); z-index: 100;
  transition: top 0.15s ease; font-weight: 500;
}
.skip-link:focus { top: var(--space-4); }

/* ---- Brand mark + wordmark ------------------------------------------------ */
.mark { display: block; flex: none; }
.brand { display: inline-flex; align-items: center; gap: 9px; text-decoration: none; color: var(--text); }
.wordmark { font-family: var(--font-display); font-weight: 500; font-size: 1.4rem; letter-spacing: -0.028em; line-height: 0.9; }
.descriptor { font-family: var(--font-mono); font-size: 0.6rem; letter-spacing: 0.5em; color: var(--muted); text-transform: uppercase; }

/* ---- Buttons -------------------------------------------------------------- */
.btn {
  display: inline-flex; align-items: center; gap: var(--space-2);
  font-family: var(--font-display); font-size: var(--fs-small); font-weight: 500; line-height: 1;
  padding: 0.85em 1.35em; border-radius: var(--radius-sm); border: 1px solid transparent;
  text-decoration: none; cursor: pointer;
  transition: transform 0.12s ease, background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.btn:active { transform: scale(0.98); }
.btn-primary { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); font-weight: 600; }
.btn-primary:hover { background: #ffce5a; }
:root[data-theme="light"] .btn-primary { color: #fff; }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border-strong); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }

/* ---- Header / nav --------------------------------------------------------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 86%, transparent);
  backdrop-filter: saturate(150%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap { display: flex; align-items: center; justify-content: space-between; gap: var(--space-4); min-height: 66px; }
.nav { display: flex; align-items: center; gap: var(--space-6); }
.nav-links { display: flex; gap: var(--space-5); list-style: none; margin: 0; padding: 0; }
.nav-links a { text-decoration: none; color: var(--muted); font-size: var(--fs-small); font-weight: 400; transition: color 0.15s ease; }
.nav-links a:hover { color: var(--text); }
.header-tools { display: flex; align-items: center; gap: var(--space-3); }

.theme-toggle {
  width: 38px; height: 38px; display: inline-grid; place-items: center;
  border: 1px solid var(--border-strong); border-radius: var(--radius-sm);
  background: var(--surface); color: var(--text); cursor: pointer; transition: border-color 0.15s ease;
}
.theme-toggle:hover { border-color: var(--accent); }
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-sun { display: block; }
.theme-toggle .icon-moon { display: none; }
:root[data-theme="light"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="light"] .theme-toggle .icon-moon { display: block; }

/* ---- Hero ----------------------------------------------------------------- */
.hero {
  padding-block: clamp(var(--space-8), 4vw + 2rem, var(--space-10));
  border-bottom: 1px solid var(--border);
  background: radial-gradient(120% 130% at 82% 26%, rgba(242, 190, 60, 0.07), transparent 52%);
}
.hero .wrap { display: grid; grid-template-columns: 1.4fr 1fr; gap: var(--space-8); align-items: center; }
.hero-eyebrow { font-family: var(--font-mono); font-size: var(--fs-meta); letter-spacing: 0.32em; text-transform: uppercase; color: var(--accent); margin-bottom: var(--space-6); }
.hero h1 { font-size: var(--fs-display); font-weight: 500; max-width: 14ch; text-wrap: balance; }
.hero-sub { margin-top: var(--space-6); font-size: var(--fs-lead); color: var(--muted); max-width: 48ch; font-weight: 300; }
.hero-actions { margin-top: var(--space-7); display: flex; flex-wrap: wrap; gap: var(--space-3); }
.hero-mark { display: flex; flex-direction: column; align-items: center; gap: var(--space-3); }
.hero-mark .mark { width: clamp(120px, 16vw, 188px); filter: drop-shadow(0 22px 34px rgba(0, 0, 0, 0.45)); animation: srlFloat 6s ease-in-out infinite; }
.hero-mark .wordmark { font-size: clamp(2.4rem, 5vw, 3.6rem); }
@keyframes srlFloat { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-7px); } }
@media (prefers-reduced-motion: reduce) { .hero-mark .mark { animation: none; } }

/* ---- Services (four facets) ----------------------------------------------- */
.services-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; }
.service { background: var(--surface); padding: var(--space-6); display: flex; flex-direction: column; }
.service-top { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.facet-swatch { width: 18px; height: 18px; transform: rotate(45deg); border-radius: 2px; flex: none; }
.service-lead { font-family: var(--font-mono); font-size: var(--fs-meta); letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent); }
.service h3 { font-size: var(--fs-h3); margin-top: var(--space-4); }
.service p { margin-top: var(--space-3); color: var(--muted); font-weight: 300; }
.service ul { margin: var(--space-5) 0 0; padding: 0; list-style: none; display: flex; flex-wrap: wrap; gap: var(--space-2); }
.service li { font-size: var(--fs-meta); font-family: var(--font-mono); letter-spacing: 0.04em; color: var(--faint); border: 1px solid var(--border); border-radius: 999px; padding: 0.4em 0.85em; }

/* ---- Audiences ------------------------------------------------------------ */
.audiences { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); }
.audience { padding: var(--space-5); border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
.audience h3 { font-size: 1.15rem; }
.audience p { margin-top: var(--space-2); color: var(--muted); font-size: var(--fs-small); font-weight: 300; }

/* ---- Work / projects ------------------------------------------------------ */
.work-head { display: flex; flex-wrap: wrap; align-items: flex-end; justify-content: space-between; gap: var(--space-4); margin-bottom: var(--space-6); }
.work-filters { display: flex; flex-wrap: wrap; gap: var(--space-2); }
.filter-btn { font-family: var(--font-mono); font-size: var(--fs-meta); letter-spacing: 0.06em; text-transform: uppercase; background: transparent; border: 1px solid var(--border-strong); color: var(--muted); border-radius: 999px; padding: 0.5em 0.95em; cursor: pointer; transition: color 0.15s ease, border-color 0.15s ease, background-color 0.15s ease; }
.filter-btn:hover { color: var(--text); border-color: var(--accent); }
.filter-btn[aria-pressed="true"] { background: var(--accent); color: var(--accent-ink); border-color: var(--accent); }

.work-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(min(100%, 20rem), 1fr)); gap: var(--space-5); }
.project { display: flex; flex-direction: column; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); overflow: hidden; transition: box-shadow 0.2s ease, border-color 0.2s ease; }
.project:hover { box-shadow: var(--shadow); border-color: var(--border-strong); }
.project-media { aspect-ratio: 16 / 10; background: var(--surface-2); display: grid; place-items: center; border-bottom: 1px solid var(--border); }
.project-media img { width: 100%; height: 100%; object-fit: cover; }
.project-media .placeholder { font-family: var(--font-mono); font-size: var(--fs-meta); letter-spacing: 0.14em; text-transform: uppercase; color: var(--faint); }
.project-body { padding: var(--space-5); display: flex; flex-direction: column; gap: var(--space-3); flex: 1; }
.project-cat { font-family: var(--font-mono); font-size: var(--fs-meta); letter-spacing: 0.12em; text-transform: uppercase; display: inline-flex; align-items: center; gap: var(--space-2); }
.project-cat .facet-dot { width: 10px; height: 10px; transform: rotate(45deg); border-radius: 2px; }
.project h3 { font-size: 1.2rem; }
.project p { color: var(--muted); font-size: var(--fs-small); font-weight: 300; }
.project-tags { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: auto; }
.project-tags span { font-size: var(--fs-meta); font-family: var(--font-mono); color: var(--faint); border: 1px solid var(--border); border-radius: 999px; padding: 0.3em 0.7em; }
.project-link { font-size: var(--fs-small); font-weight: 500; color: var(--accent); text-decoration: none; }
.project-link:hover { text-decoration: underline; }

/* ---- Process -------------------------------------------------------------- */
.process { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); }
.step { border-top: 2px solid var(--accent); padding-top: var(--space-4); }
.step-num { font-family: var(--font-mono); font-size: var(--fs-meta); color: var(--accent); letter-spacing: 0.1em; }
.step h3 { font-size: var(--fs-h3); margin-top: var(--space-2); }
.step p { margin-top: var(--space-3); color: var(--muted); font-size: var(--fs-small); font-weight: 300; }

/* ---- About ---------------------------------------------------------------- */
.about-grid { display: grid; grid-template-columns: 1fr 1.3fr; gap: var(--space-8); align-items: start; }
.about-grid h2 { font-size: var(--fs-h2); }
.about-body p + p { margin-top: var(--space-4); }
.about-body p { color: var(--muted); font-weight: 300; }
.about-body p:first-child { color: var(--text-2); font-size: var(--fs-lead); }

/* ---- Testimonials --------------------------------------------------------- */
.testimonials { display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-5); margin-top: var(--space-7); }
.testimonial { border-left: 2px solid var(--accent); padding: var(--space-2) 0 var(--space-2) var(--space-5); }
.testimonial blockquote { margin: 0; font-size: 1.25rem; line-height: 1.45; font-weight: 400; color: var(--text); letter-spacing: -0.01em; }
.testimonial cite { display: block; margin-top: var(--space-4); font-style: normal; font-size: var(--fs-small); color: var(--muted); }
.testimonial cite strong { color: var(--text); font-weight: 500; }

/* ---- FAQ ------------------------------------------------------------------ */
.faq { max-width: var(--maxw-text); }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item summary { display: flex; justify-content: space-between; align-items: center; gap: var(--space-4); padding: var(--space-5) 0; cursor: pointer; font-size: var(--fs-h3); font-weight: 500; list-style: none; color: var(--text); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item .marker { flex: none; width: 22px; height: 22px; position: relative; }
.faq-item .marker::before, .faq-item .marker::after { content: ""; position: absolute; background: var(--accent); transition: transform 0.2s ease, opacity 0.2s ease; }
.faq-item .marker::before { top: 50%; left: 2px; right: 2px; height: 2px; transform: translateY(-50%); }
.faq-item .marker::after { left: 50%; top: 2px; bottom: 2px; width: 2px; transform: translateX(-50%); }
.faq-item[open] .marker::after { opacity: 0; transform: translateX(-50%) scaleY(0); }
.faq-item .answer { padding: 0 0 var(--space-5); color: var(--muted); max-width: 62ch; font-weight: 300; }

/* ---- Contact -------------------------------------------------------------- */
.contact-grid { display: grid; grid-template-columns: 1fr 1.2fr; gap: var(--space-8); align-items: start; }
.contact-info h2 { font-size: var(--fs-h2); }
.contact-info p { margin-top: var(--space-4); color: var(--muted); font-weight: 300; }
.contact-meta { margin-top: var(--space-6); display: flex; flex-direction: column; gap: var(--space-3); }
.contact-meta a, .contact-meta span { font-size: var(--fs-small); color: var(--text-2); text-decoration: none; display: inline-flex; gap: var(--space-2); flex-wrap: wrap; }
.contact-meta a:hover { color: var(--accent); }
.contact-meta .label { font-family: var(--font-mono); font-size: var(--fs-meta); letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); }

.form-field { margin-bottom: var(--space-4); }
.form-field label { display: block; font-size: var(--fs-small); font-weight: 500; margin-bottom: var(--space-2); }
.form-field input, .form-field textarea {
  width: 100%; font-family: inherit; font-size: var(--fs-body); color: var(--text);
  background: var(--surface); border: 1px solid var(--border-strong); border-radius: var(--radius-sm); padding: 0.7em 0.85em;
}
.form-field input:focus, .form-field textarea:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.form-field textarea { resize: vertical; min-height: 8rem; }
.form-note { font-size: var(--fs-small); color: var(--muted); margin-top: var(--space-3); font-weight: 300; }
.form-note a { color: var(--accent); }
.form-status { margin-top: var(--space-3); font-size: var(--fs-small); font-weight: 500; }
.form-status.ok { color: var(--accent); }
.form-status.err { color: #f1a39c; }
/* Honeypot field — kept out of view and out of the tab order */
.hp { position: absolute !important; left: -9999px !important; width: 1px; height: 1px; opacity: 0; }

/* ---- Footer --------------------------------------------------------------- */
.site-footer { border-top: 1px solid var(--border); padding-block: var(--space-7); background: var(--bg-deep); }
.footer-grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-6); }
.footer-brand .descriptor { display: block; margin-top: 6px; padding-top: 6px; border-top: 1px solid var(--border); width: 5.5rem; }
.footer-facets { display: flex; gap: var(--space-2); margin-top: var(--space-4); }
.footer-facets i { width: 10px; height: 10px; transform: rotate(45deg); border-radius: 2px; display: block; }
.footer-tag { margin-top: var(--space-3); color: var(--muted); font-size: var(--fs-small); font-weight: 300; }
.footer-cols { display: flex; flex-wrap: wrap; gap: var(--space-8); }
.footer-col h4 { font-family: var(--font-mono); font-size: var(--fs-meta); letter-spacing: 0.12em; text-transform: uppercase; color: var(--faint); font-weight: 400; margin-bottom: var(--space-3); }
.footer-col ul { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: var(--space-2); }
.footer-col a { font-size: var(--fs-small); color: var(--text-2); text-decoration: none; }
.footer-col a:hover { color: var(--accent); }
.footer-legal { width: 100%; margin-top: var(--space-6); padding-top: var(--space-5); border-top: 1px solid var(--border); display: flex; flex-wrap: wrap; justify-content: space-between; gap: var(--space-3); font-size: var(--fs-small); color: var(--faint); }
.footer-legal a { color: var(--muted); }

/* ---- Legal pages ---------------------------------------------------------- */
.legal { max-width: var(--maxw-text); padding-block: var(--space-8); }
.legal h1 { font-size: var(--fs-h2); }
.legal .updated { color: var(--muted); font-size: var(--fs-small); margin-top: var(--space-3); }
.legal h2 { font-size: var(--fs-h3); margin-top: var(--space-7); }
.legal p, .legal li { color: var(--muted); margin-top: var(--space-3); font-weight: 300; }
.legal ul { padding-left: var(--space-5); }
.back-link { display: inline-block; margin-top: var(--space-7); font-size: var(--fs-small); font-weight: 500; color: var(--accent); text-decoration: none; }
.back-link:hover { text-decoration: underline; }

/* ---- Scroll reveal -------------------------------------------------------- */
.reveal { opacity: 0; transform: translateY(12px); transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1), transform 0.6s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal.is-visible { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; } }

/* ---- Responsive ----------------------------------------------------------- */
@media (max-width: 860px) {
  .hero .wrap { grid-template-columns: 1fr; }
  .hero-mark { order: -1; align-items: flex-start; }
  .about-grid, .contact-grid { grid-template-columns: 1fr; gap: var(--space-6); }
  .process { grid-template-columns: 1fr; gap: var(--space-5); }
  .testimonials { grid-template-columns: 1fr; }
}
@media (max-width: 640px) {
  .nav-links { display: none; }
  .services-list, .audiences { grid-template-columns: 1fr; }
  .section { padding-block: var(--space-8); }
}