/* ==========================================================================
   Ibrahim Ojoye — Portfolio design system
   Source: AuditFlow_OS_Brand_Style_Guide.md (production AuditFlow OS values)
   ========================================================================== */

:root {
  --audit-green: #315C4D;
  --warm-stone: #F4F1EA;
  --deep-charcoal: #1F2421;
  --terracotta-risk: #B86B4B;
  --muted-gold: #B89B5E;
  --off-white: #FAF8F3;
  --soft-sand: #DDD3C1;
  --slate: #59615D;
  --sage: #8A9A86;
  --hairline: #D8D2C7;
  --warm-amber: #C2894A;
  --deep-rust: #8B4A34;

  --font-heading: 'DM Serif Display', Georgia, serif;
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --radius-card: 16px;
  --shadow-card: 0 4px 18px rgba(31, 36, 33, 0.10);
  --shadow-card-hover: 0 8px 28px rgba(31, 36, 33, 0.16);
  --max-width: 1120px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

* { box-sizing: border-box; }

html { font-size: 18px; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--warm-stone);
  color: var(--deep-charcoal);
  line-height: 1.6;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 400;
  line-height: 1.2;
  margin: 0 0 0.6em;
  color: var(--deep-charcoal);
}

h1 { font-size: 2.6rem; }
h2 { font-size: 1.9rem; }
h3 { font-size: 1.4rem; }
h4 { font-size: 1.1rem; }

p { margin: 0 0 1em; }

a { color: var(--audit-green); text-decoration: none; }
a:hover { text-decoration: underline; }

.eyebrow {
  font-family: var(--font-body);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  color: var(--slate);
  margin-bottom: 0.5em;
  display: block;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---- Top bar / wordmark ---- */

.topbar {
  background: var(--deep-charcoal);
  color: var(--off-white);
  padding: 10px 0;
  font-size: 0.85rem;
}

.topbar .container { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 8px; }

.wordmark {
  font-family: var(--font-body);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.85rem;
  color: var(--off-white);
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.wordmark img { height: 22px; width: auto; }

.topbar-tagline { color: var(--soft-sand); font-size: 0.82rem; }

/* ---- Nav ---- */

nav.mainnav {
  background: var(--audit-green);
  position: sticky;
  top: 0;
  z-index: 40;
}

nav.mainnav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 12px;
  padding-bottom: 12px;
}

nav.mainnav ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin: 0;
  padding: 0;
}

nav.mainnav li { position: relative; }

nav.mainnav a {
  color: var(--off-white);
  font-size: 0.92rem;
  padding: 8px 12px;
  border-radius: 8px;
  display: inline-block;
}

nav.mainnav a:hover, nav.mainnav a:focus, nav.mainnav a.active {
  background: rgba(255,255,255,0.14);
  text-decoration: none;
}

nav.mainnav .dropdown-panel {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--off-white);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  box-shadow: var(--shadow-card);
  min-width: 220px;
  padding: 6px;
}

nav.mainnav li:hover .dropdown-panel,
nav.mainnav li:focus-within .dropdown-panel { display: block; }

nav.mainnav .dropdown-panel a { color: var(--deep-charcoal); display: block; }
nav.mainnav .dropdown-panel a:hover { background: var(--warm-stone); }

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  padding: 12px 22px;
  border-radius: 10px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  border: none;
}

.btn:hover { transform: translateY(-1px); text-decoration: none; }
.btn:active { transform: scale(0.98); }
.btn:focus-visible { outline: 2px solid var(--audit-green); outline-offset: 2px; }

.btn-primary { background: var(--audit-green); color: var(--off-white); }
.btn-primary:hover { background: #294c40; color: var(--off-white); }

.btn-secondary {
  background: var(--off-white);
  color: var(--deep-charcoal);
  border: 1px solid rgba(31,36,33,0.2);
}

/* ---- Sections / alternating backgrounds ---- */

section { padding: 64px 0; }

.bg-cream { background: var(--warm-stone); }
.bg-cream-2 { background: var(--off-white); }
.bg-dark { background: var(--deep-charcoal); color: var(--off-white); }
.bg-dark h1, .bg-dark h2, .bg-dark h3 { color: var(--off-white); }

/* ---- Hero ---- */

.hero { padding: 72px 0 56px; }
.hero .badges { margin: 18px 0 26px; }
.hero .cta-row { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 26px; }

/* ---- Badges / tags / pills ---- */

.badge {
  display: inline-block;
  font-size: 0.78rem;
  padding: 6px 12px;
  border-radius: 999px;
  margin: 0 8px 8px 0;
  background: rgba(49, 92, 77, 0.10);
  color: var(--audit-green);
}

.badge-outline { background: transparent; border: 1px solid rgba(31,36,33,0.2); color: var(--deep-charcoal); }
.badge-muted { background: rgba(89, 97, 93, 0.12); color: var(--slate); }
.badge-amber { background: rgba(184, 155, 94, 0.16); color: var(--muted-gold); }
.badge-risk { background: rgba(184, 107, 75, 0.14); color: var(--terracotta-risk); }
.badge-sage { background: rgba(138, 154, 134, 0.16); color: var(--sage); }

/* ---- Cards ---- */

.card {
  background: var(--off-white);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  padding: 28px;
  transition: box-shadow 0.15s ease, transform 0.15s ease, border-color 0.15s ease;
}

.card.interactive:hover {
  box-shadow: var(--shadow-card-hover);
  border-color: rgba(49,92,77,0.35);
  transform: translateY(-1px);
}

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }

/* ---- Snapshot field grid (delivery case studies) ---- */

.snapshot {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  background: var(--warm-stone);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: 20px;
  margin: 20px 0;
}

.snapshot dt { font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--slate); margin-bottom: 4px; }
.snapshot dd { margin: 0; font-weight: 600; }

/* ---- Process / flow diagrams ---- */

.flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 20px 0;
}

.flow .step {
  background: var(--off-white);
  border: 1px solid var(--hairline);
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 0.9rem;
}

.flow .arrow { color: var(--muted-gold); font-size: 1.1rem; }

/* ---- Timeline ---- */

.timeline { display: flex; flex-wrap: wrap; gap: 0; align-items: stretch; }
.timeline .entry {
  flex: 1 1 180px;
  background: var(--off-white);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: 18px;
  margin: 8px;
}
.timeline .entry .years { font-size: 0.78rem; color: var(--slate); text-transform: uppercase; letter-spacing: 0.06em; }

/* ---- Tables ---- */

table { width: 100%; border-collapse: collapse; margin: 20px 0; font-size: 0.92rem; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--hairline); vertical-align: top; }
th { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--slate); }

/* ---- Illustrative artefact callout ---- */

.artefact-note {
  border-left: 3px solid var(--warm-amber);
  background: rgba(194, 137, 74, 0.08);
  padding: 14px 18px;
  border-radius: 0 10px 10px 0;
  font-size: 0.88rem;
  color: var(--slate);
  margin: 14px 0;
}

.illustrative-tag {
  display: inline-block;
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  background: var(--deep-rust);
  color: var(--off-white);
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 8px;
}

/* ---- Details/expand ---- */

details.case-study {
  background: var(--off-white);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-card);
  padding: 24px;
  margin: 20px 0;
  box-shadow: var(--shadow-card);
}

details.case-study summary {
  cursor: pointer;
  font-family: var(--font-heading);
  font-size: 1.4rem;
  list-style: none;
}
details.case-study summary::-webkit-details-marker { display: none; }
details.case-study summary::after { content: " +"; color: var(--audit-green); }
details.case-study[open] summary::after { content: " –"; }

/* ---- Two-lens split (home) ---- */

.split-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px,1fr)); gap: 24px; }
.split-cards .card h3 { color: var(--audit-green); }

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

footer.site-footer {
  background: var(--deep-charcoal);
  color: var(--off-white);
  padding: 48px 0 28px;
}
footer.site-footer a { color: var(--off-white); }
footer.site-footer .contact-links { margin: 12px 0 24px; }
footer.site-footer .fineprint { color: var(--soft-sand); font-size: 0.82rem; margin-top: 24px; }

img.screenshot {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 10px;
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-card);
  margin-bottom: 6px;
}
figure { margin: 0 0 24px; }
figcaption { font-size: 0.82rem; color: var(--slate); }

.section-head { max-width: 720px; margin-bottom: 32px; }

@media (max-width: 720px) {
  html { font-size: 16.5px; }
  h1 { font-size: 2.1rem; }
  section { padding: 44px 0; }
  nav.mainnav ul { gap: 2px; }
}

/* ---- Back to top ---- */

.back-to-top {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--audit-green);
  color: var(--off-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  box-shadow: var(--shadow-card-hover);
  z-index: 50;
  transition: transform 0.15s ease, background 0.15s ease;
}

.back-to-top:hover {
  background: #294c40;
  transform: translateY(-2px);
  text-decoration: none;
}

.back-to-top:focus-visible {
  outline: 2px solid var(--deep-charcoal);
  outline-offset: 2px;
}

@media (max-width: 720px) {
  .back-to-top { right: 14px; bottom: 14px; width: 40px; height: 40px; }
}

/* ---- Contrast-safe badge text (WCAG AA fix) ---- */

:root {
  --gold-text: #6F5A2F;
  --sage-text: #4F624D;
  --risk-text: #8B4A34;
}

.badge-amber { color: var(--gold-text); }
.badge-sage { color: var(--sage-text); }
.badge-risk { color: var(--risk-text); }

/* ---- Focus styles for all links ---- */

a:focus-visible {
  outline: 2px solid var(--audit-green);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ---- Skip link ---- */

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--audit-green);
  color: var(--off-white);
  padding: 12px 20px;
  z-index: 100;
  border-radius: 0 0 8px 0;
}

.skip-link:focus {
  left: 0;
}

/* ---- Responsive table wrapper ---- */

.table-wrap {
  width: 100%;
  overflow-x: auto;
  margin: 20px 0;
  -webkit-overflow-scrolling: touch;
}

.table-wrap table { margin: 0; min-width: 480px; }

/* ---- Active nav item ---- */

nav.mainnav a[aria-current="page"] {
  background: rgba(255,255,255,0.18);
  font-weight: 600;
}

/* ---- Mobile navigation ---- */

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid rgba(255,255,255,0.4);
  color: var(--off-white);
  border-radius: 8px;
  padding: 8px 12px;
  font-size: 0.95rem;
  cursor: pointer;
}

@media (max-width: 720px) {
  .nav-toggle { display: inline-block; }

  nav.mainnav .container { position: relative; }

  nav.mainnav ul {
    display: none;
    flex-direction: column;
    width: 100%;
    background: var(--audit-green);
    padding: 8px 0;
  }

  nav.mainnav ul.nav-open { display: flex; }

  nav.mainnav li { width: 100%; }
  nav.mainnav li > a { display: block; width: 100%; }

  nav.mainnav .dropdown-panel {
    position: static;
    display: none;
    box-shadow: none;
    border: none;
    background: rgba(255,255,255,0.06);
    margin: 4px 0 4px 12px;
    min-width: 0;
  }

  nav.mainnav .dropdown-panel.open { display: block; }
  nav.mainnav .dropdown-panel a { color: var(--off-white); }
  nav.mainnav .dropdown-panel a:hover { background: rgba(255,255,255,0.12); }
}

/* ---- Lightbox (click-to-zoom) ---- */

.screenshot { cursor: zoom-in; }

.lightbox-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(31, 36, 33, 0.85);
  z-index: 200;
  align-items: center;
  justify-content: center;
  padding: 24px 24px 104px;
}

.lightbox-overlay.open { display: flex; }

.lightbox-frame {
  position: relative;
  width: min(72rem, 92vw);
  height: 85vh;
  overflow: auto;
  border-radius: var(--radius-card);
  border: 1px solid rgba(250, 248, 243, 0.12);
  box-shadow: 0 10px 40px rgba(0,0,0,0.5);
  background: rgba(0, 0, 0, 0.12);
  scrollbar-color: var(--soft-sand) transparent;
}

.lightbox-frame::-webkit-scrollbar { width: 10px; height: 10px; }
.lightbox-frame::-webkit-scrollbar-track { background: transparent; }
.lightbox-frame::-webkit-scrollbar-thumb {
  background: rgba(250, 248, 243, 0.35);
  border-radius: 10px;
}

.lightbox-frame img {
  display: block;
  user-select: none;
  -webkit-user-drag: none;
  cursor: zoom-in;
}

.lightbox-frame.zoomed img { cursor: grab; }
.lightbox-frame.zoomed.dragging img { cursor: grabbing; }

.lightbox-toolbar {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translateX(-50%);
  display: flex;
  align-items: center;
  gap: 2px;
  background: var(--off-white);
  border-radius: 999px;
  padding: 6px;
  box-shadow: var(--shadow-card-hover);
  z-index: 210;
}

.lightbox-zoom-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: none;
  background: transparent;
  color: var(--deep-charcoal);
  font-size: 1.05rem;
  line-height: 1;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lightbox-zoom-btn:hover:not(:disabled) { background: var(--warm-stone); }

.lightbox-zoom-btn:disabled {
  color: var(--hairline);
  cursor: not-allowed;
}

.lightbox-zoom-level {
  min-width: 50px;
  text-align: center;
  font-size: 0.82rem;
  color: var(--slate);
  font-variant-numeric: tabular-nums;
}

.lightbox-reset {
  background: transparent;
  border: none;
  border-left: 1px solid var(--hairline);
  margin-left: 4px;
  padding: 6px 14px 6px 16px;
  font-size: 0.8rem;
  color: var(--slate);
  cursor: pointer;
  border-radius: 0 999px 999px 0;
}

.lightbox-reset:hover { color: var(--audit-green); }

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 24px;
  background: var(--off-white);
  color: var(--deep-charcoal);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  font-size: 1.2rem;
  cursor: pointer;
  z-index: 210;
}

/* ---- Collapsible footer contact ---- */

.contact-details summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.78rem;
  color: var(--soft-sand);
  padding: 4px 0;
}

.contact-details summary::-webkit-details-marker { display: none; }

.contact-details summary::after {
  content: " \25BE";
  display: inline-block;
  margin-left: 6px;
}

.contact-details[open] summary::after {
  content: " \25B4";
}

.contact-details summary:focus-visible {
  outline: 2px solid var(--off-white);
  outline-offset: 3px;
}

.contact-details-body {
  padding-top: 16px;
}

/* ---- Screen-reader-only text ---- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ---- Submenu disclosure button ---- */

nav.mainnav li.has-submenu {
  display: flex;
  align-items: center;
  position: relative;
}

.submenu-toggle {
  background: none;
  border: none;
  color: var(--off-white);
  cursor: pointer;
  padding: 8px 6px;
  font-size: 0.75rem;
  line-height: 1;
}

.submenu-toggle::after {
  content: "\25BE";
  display: inline-block;
}

.submenu-toggle[aria-expanded="true"]::after {
  content: "\25B4";
}

.submenu-toggle:focus-visible {
  outline: 2px solid var(--off-white);
  outline-offset: 2px;
  border-radius: 4px;
}

@media (max-width: 720px) {
  nav.mainnav li.has-submenu {
    flex-wrap: wrap;
    justify-content: space-between;
  }
  nav.mainnav li.has-submenu > a { flex: 1; }
}

/* ---- Keyboard-focusable screenshots ---- */

img.screenshot:focus-visible {
  outline: 3px solid var(--audit-green);
  outline-offset: 3px;
}

.lightbox-close:focus-visible,
.lightbox-zoom-btn:focus-visible,
.lightbox-reset:focus-visible {
  outline: 2px solid var(--audit-green);
  outline-offset: 2px;
}