/* =========================================================================
   One Person Company — Unified Design System (ia.css)
   Editorial Operator — beige theme (#FAFAF8 / #FF5A1F). Design tokens + shared components for every hub page:
   home, /skills/, /skills/<category>/, /start-here/.
   Keeps all legacy class names so existing markup renders premium.
   ========================================================================= */

/* Palette lives in assets/tokens.css — the single source of truth.
   ia.css only defines hub-page components on top of those tokens. */

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

html {
  background: var(--bg);
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  font-weight: 400;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
}

::selection {
  background: rgba(255, 90, 31, 0.28);
  color: #fff;
}

/* ---------- Announcement bar ---------- */
.announce {
  position: relative;
  z-index: 15;
  display: flex;
  justify-content: center;
  padding: 9px 20px;
  background: linear-gradient(90deg, rgba(255, 90, 31, 0.1), rgba(255, 90, 31, 0.05));
  border-bottom: 1px solid var(--line);
}

.announce a {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--ink);
  font-size: 0.82rem;
  font-weight: 500;
  text-decoration: none;
}

.announce .pill {
  display: inline-flex;
  align-items: center;
  padding: 2px 9px;
  border-radius: var(--radius-pill);
  background: var(--accent);
  color: #fff;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.announce .txt {
  color: var(--muted);
}

.announce .arw {
  color: var(--accent);
  transition: transform var(--ease);
}

.announce a:hover .arw {
  transform: translateX(4px);
}

/* ---------- Nav ---------- */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 20;
  height: 66px;
  padding: 0 40px;
  border-bottom: 1px solid var(--line);
  background: rgba(250, 250, 248, 0.82);
  backdrop-filter: blur(18px) saturate(140%);
  -webkit-backdrop-filter: blur(18px) saturate(140%);
  display: flex;
  align-items: center;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--ink);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  letter-spacing: -0.01em;
}

.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 4px 12px var(--accent-shadow);
  flex: none;
  position: relative;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 6px;
  border-radius: 3px;
  background: rgba(250, 250, 248, 0.96);
}

.desktop-nav {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-left: auto;
}

.desktop-nav > a,
.dropdown-trigger {
  color: var(--muted);
  font: 600 0.875rem/1 "Inter", -apple-system, system-ui, sans-serif;
  text-decoration: none;
  background: transparent;
  border: 0;
  border-radius: var(--radius-sm);
  padding: 0.7rem 0.85rem;
  cursor: pointer;
  transition: color var(--ease), background var(--ease);
}

.desktop-nav > a:hover,
.dropdown-trigger:hover,
.dropdown.open .dropdown-trigger {
  color: var(--ink);
  background: var(--surface-hover);
}

/* ---------- Buttons ---------- */
.nav-cta,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.72rem 1.4rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: background var(--ease), border-color var(--ease), box-shadow var(--ease), transform var(--ease), color var(--ease);
}

.nav-cta,
.primary {
  color: #fff;
  background: var(--accent);
  border: 1px solid rgba(255, 90, 31, 0.2);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2), 0 0 0 1px rgba(255, 90, 31, 0.1);
}

.nav-cta:hover,
.primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-shadow), 0 0 0 1px rgba(255, 90, 31, 0.25);
}

.primary:active {
  background: var(--accent-active);
  transform: translateY(0);
}

.secondary {
  color: var(--ink);
  background: rgba(17, 17, 17, 0.026);
  border: 1px solid var(--line-strong);
}

.secondary:hover {
  background: var(--surface-hover);
  border-color: rgba(17, 17, 17, 0.160);
  transform: translateY(-1px);
}

.button.lg {
  min-height: 52px;
  padding: 0.9rem 1.9rem;
  font-size: 1.02rem;
}

.menu-toggle {
  display: none;
  margin-left: auto;
  width: 44px;
  height: 44px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-sm);
}

.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--ink);
  margin: 6px 10px;
}

.mobile-menu {
  display: none;
}

/* ---------- Nav dropdown (mega menu) ---------- */
.dropdown {
  position: relative;
}

.dropdown-panel {
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 0;
  width: min(600px, calc(100vw - 48px));
  padding: 1.5rem;
  background: var(--panel);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(17, 17, 17, 0.130);
  border-radius: 14px;
  box-shadow: 0 24px 50px -12px rgba(17, 17, 17, 0.14);
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  opacity: 0;
  visibility: hidden;
  transform: translateY(6px);
  transition: opacity var(--ease), visibility var(--ease), transform var(--ease);
}

.dropdown:hover .dropdown-panel,
.dropdown.open .dropdown-panel,
.dropdown:focus-within .dropdown-panel {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Legacy dropdown links (plain <a> inside panel) rendered as mega cards */
.dropdown-panel > a {
  display: block;
  padding: 0.9rem;
  border-radius: 10px;
  text-decoration: none;
  transition: background var(--ease), transform var(--ease);
}

.dropdown-panel > a:hover {
  background: var(--surface-hover);
  transform: translateY(-1px);
}

.dropdown-panel > a span {
  display: block;
  color: var(--ink);
  font-size: 0.875rem;
  font-weight: 600;
}

.dropdown-panel > a small {
  display: block;
  color: var(--subtle);
  font-size: 0.75rem;
  font-weight: 400;
  margin-top: 2px;
}

.mega-card {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  column-gap: 0.75rem;
  row-gap: 0.25rem;
  padding: 0.9rem;
  border-radius: 10px;
  text-decoration: none;
  transition: background var(--ease), transform var(--ease);
}

.mega-card:hover {
  background: var(--surface-hover);
  transform: translateY(-1px);
}

.mega-icon {
  grid-row: span 2;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 1px solid rgba(255, 90, 31, 0.35);
  border-radius: var(--radius-sm);
  color: var(--accent);
  font-size: 0.72rem;
  font-weight: 700;
}

.mega-card strong {
  color: var(--ink);
  font-size: 0.875rem;
  font-weight: 600;
}

.mega-card small {
  color: var(--subtle);
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.4;
}

/* ---------- Typography ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 1.25rem;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1;
  text-transform: uppercase;
}

.eyebrow.pill {
  padding: 7px 14px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 90, 31, 0.28);
  background: rgba(255, 90, 31, 0.06);
}

.eyebrow .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

h1,
h2,
h3,
p {
  letter-spacing: 0;
}

h1 {
  color: var(--ink);
  max-width: 820px;
  margin: 0;
  font-size: clamp(2.35rem, 4.2vw, 3.6rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.035em;
}

h2 {
  color: var(--ink);
  margin: 0;
  font-size: clamp(1.9rem, 3.4vw, 2.7rem);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

h3 {
  color: var(--ink);
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.grad-text {
  background: linear-gradient(178deg, #ffffff 0%, #ffffff 42%, #ffcbac 74%, var(--accent) 106%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ---------- Page hero (interior hub pages) ---------- */
.hero,
.page-hero {
  position: relative;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 92px 40px 60px;
}

.page-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  left: 50%;
  width: min(900px, 110%);
  height: 460px;
  transform: translateX(-50%);
  background: radial-gradient(closest-side, var(--glow), transparent 72%);
  filter: blur(10px);
  pointer-events: none;
  z-index: 0;
}

.page-hero > * {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  max-width: 900px;
}

.home-hero {
  min-height: calc(100vh - 66px);
  display: grid;
  grid-template-columns: minmax(0, 48%) minmax(0, 52%);
  gap: 3rem;
  align-items: center;
}

.hero-copy {
  padding-right: 3rem;
}

.lead {
  max-width: 660px;
  color: var(--muted);
  font-size: 1.22rem;
  font-weight: 400;
  line-height: 1.55;
  letter-spacing: -0.01em;
  margin: 1.5rem 0 0;
}

.lead strong {
  color: var(--ink);
  font-weight: 600;
}

.actions {
  display: flex;
  gap: 0.85rem;
  flex-wrap: wrap;
  margin-top: 2rem;
}

.hero-proof {
  margin: 1.5rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
  font-weight: 400;
}

.hero-proof strong {
  color: var(--ink);
  font-weight: 600;
}

.hero-proof span {
  color: var(--subtle);
  margin: 0 0.4rem;
}

/* ---------- Bands / sections ---------- */
.band {
  padding: 72px 40px;
  border-top: 1px solid var(--line);
  background: rgba(17, 17, 17, 0.019);
}

.band.white {
  background: rgba(17, 17, 17, 0.039);
}

.section-head,
.category-grid,
.columns,
.split,
.process,
.footer,
.content-grid,
.qa-grid,
.article-copy,
.skill-list,
.metric-strip {
  max-width: var(--maxw);
  margin: 0 auto;
}

.section-head {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  align-items: end;
  margin-bottom: 36px;
}

.section-head .eyebrow {
  margin-bottom: 0.75rem;
}

/* ---------- Category cards ---------- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.category-grid.compact {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (min-width: 981px) {
  .category-grid.trio {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.category-card {
  position: relative;
  display: flex;
  min-height: 250px;
  flex-direction: column;
  gap: 14px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  overflow: hidden;
  transition: background var(--ease), border-color var(--ease), box-shadow var(--ease), transform var(--ease);
}

.category-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  opacity: 0;
  transition: opacity var(--ease);
}

.category-card:hover {
  background: var(--surface-2);
  border-color: rgba(17, 17, 17, 0.160);
  box-shadow: 0 24px 46px -22px rgba(17, 17, 17, 0.16);
  transform: translateY(-3px);
}

.category-card:hover::before {
  opacity: 1;
}

.category-card h3 {
  font-size: 1.35rem;
}

.category-card p {
  color: var(--muted);
  margin: 0;
  font-size: 0.98rem;
  line-height: 1.55;
}

.category-card span {
  margin-top: auto;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.category-card span::after {
  content: "→";
  transition: transform var(--ease);
}

.category-card:hover span::after {
  transform: translateX(4px);
}

.card-meta {
  display: inline-flex;
  align-items: center;
  align-self: flex-start;
  padding: 4px 11px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  background: rgba(17, 17, 17, 0.039);
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* ---------- Generic content grids ---------- */
.content-grid,
.qa-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.content-grid.two {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: 28px;
}

.text-panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  transition: background var(--ease), border-color var(--ease);
}

.text-panel:hover {
  background: var(--surface-2);
  border-color: var(--line-strong);
}

.text-panel p,
.article-copy p {
  color: var(--muted);
  font-size: 1rem;
  margin: 14px 0 0;
}

.article-copy {
  max-width: 920px;
}

.article-copy p:first-child {
  margin-top: 0;
}

/* ---------- Split section ---------- */
.split {
  padding: 72px 40px;
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(320px, 1fr);
  gap: 44px;
  align-items: start;
}

.split p {
  color: var(--muted);
  font-size: 1rem;
}

.text-link {
  color: var(--accent);
  font-size: 1.4rem;
  font-weight: 600;
  text-decoration: none;
  transition: color var(--ease), transform var(--ease);
}

.text-link:hover {
  color: var(--accent-hover);
  transform: translateY(-1px);
}

/* ---------- Columns (representative skills) ---------- */
.columns {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
  align-items: start;
}

.column {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.column h3 {
  margin-bottom: 6px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
}

/* ---------- Skill rows / cards ---------- */
.skill-list {
  display: grid;
  gap: 12px;
  max-width: 980px;
}

.skill-row {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  transition: background var(--ease), border-color var(--ease), box-shadow var(--ease), transform var(--ease);
}

.skill-row:hover {
  background: var(--surface-2);
  border-color: rgba(17, 17, 17, 0.160);
  box-shadow: 0 16px 30px -20px rgba(17, 17, 17, 0.16);
  transform: translateY(-2px);
}

.skill-row span {
  color: var(--ink);
  font-weight: 600;
  font-size: 0.95rem;
}

.skill-row small {
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* When a skill-list uses two-column labeled rows (category pages) */
.skill-list .skill-row {
  flex-direction: row;
  align-items: baseline;
  gap: 18px;
}

.skill-list .skill-row span {
  flex: 0 0 240px;
}

.skill-list .skill-row small {
  -webkit-line-clamp: 2;
}

/* ---------- Metric strip ---------- */
.metric-strip {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.metric-strip span {
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  background: var(--surface);
  padding: 9px 15px;
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- Lists ---------- */
.step-list,
.week-list {
  margin: 0;
  padding-left: 20px;
  font-size: 1rem;
  font-weight: 500;
  color: var(--muted);
}

.step-list li,
.week-list li {
  margin-bottom: 14px;
}

.step-list li::marker,
.week-list li::marker {
  color: var(--accent);
  font-weight: 700;
}

/* ---------- Process cards ---------- */
.process {
  padding: 0 40px 72px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.process article {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}

.process article:hover {
  background: var(--surface-2);
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.process span {
  color: var(--accent);
  font-weight: 700;
  font-size: 0.95rem;
}

.process p {
  margin: 14px 0 0;
  font-weight: 500;
  color: var(--muted);
}

/* ---------- Footer ---------- */
.footer {
  padding: 52px 40px;
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
  border-top: 1px solid var(--line);
}

.footer strong {
  color: var(--ink);
  font-size: 1rem;
}

.footer p {
  color: var(--muted);
  margin: 8px 0 0;
  font-size: 0.92rem;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--muted);
  font-weight: 600;
  font-size: 0.92rem;
  text-decoration: none;
  transition: color var(--ease);
}

.footer-links a:hover {
  color: var(--ink);
}

.attribution {
  flex-basis: 100%;
  margin-top: 8px;
  color: var(--subtle);
  font-size: 0.78rem;
  font-weight: 400;
}

.attribution a {
  color: var(--subtle);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  transition: color var(--ease);
}

.attribution a:hover {
  color: var(--accent);
}

/* =========================================================================
   Responsive
   ========================================================================= */
@media (max-width: 980px) {
  .desktop-nav,
  .nav-cta {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .site-nav {
    padding: 0 20px;
  }

  .mobile-menu {
    position: fixed;
    inset: 66px 0 0;
    z-index: 30;
    background: rgba(250, 250, 248, 0.98);
    backdrop-filter: blur(10px);
    padding: 1.25rem;
    overflow-y: auto;
  }

  .mobile-menu.open {
    display: grid;
    align-content: start;
    gap: 0.4rem;
  }

  .mobile-menu a {
    padding: 1rem;
    border: 1px solid var(--line);
    border-radius: 10px;
    color: var(--ink);
    text-decoration: none;
    font-weight: 600;
  }

  .home-hero,
  .split {
    grid-template-columns: 1fr;
  }

  .hero,
  .page-hero {
    padding: 60px 20px 44px;
  }

  .home-hero {
    min-height: auto;
  }

  .hero-copy {
    padding-right: 0;
  }

  .band {
    padding: 52px 20px;
  }

  .category-grid,
  .category-grid.compact,
  .columns,
  .process,
  .content-grid,
  .qa-grid,
  .content-grid.two {
    grid-template-columns: 1fr 1fr;
  }

  .skill-list .skill-row {
    flex-direction: column;
  }

  .skill-list .skill-row span {
    flex: none;
  }

  .section-head {
    display: block;
  }

  .footer {
    display: block;
  }

  .footer-links {
    margin-top: 16px;
  }
}

@media (max-width: 620px) {
  h1 {
    font-size: 2.35rem;
  }

  h2 {
    font-size: 1.9rem;
  }

  .lead {
    font-size: 1.1rem;
  }

  .actions {
    flex-direction: column;
  }

  .actions .button {
    width: 100%;
  }

  .category-grid,
  .category-grid.compact,
  .columns,
  .process,
  .content-grid,
  .qa-grid,
  .content-grid.two {
    grid-template-columns: 1fr;
  }

  .category-card {
    min-height: 0;
  }

  .split {
    padding: 52px 20px;
  }

  .footer {
    padding: 40px 20px;
  }
}

/* ============================================================
   AI illustration integration (TYC-303 visual upgrade)
   Interior page hero banners + category-card cover images.
   ============================================================ */

/* Category card cover illustration */