/* ===========================================
   ZEEYAD KHAN PORTFOLIO — SHARED STYLESHEET
   Plus Jakarta Sans · Editorial layout
   =========================================== */

/* ─── TOKENS ─── */
:root {
  --white:        #FEFEFE;
  --blue:         #246EFA;
  --yellow:       #F9AE22;
  --red:          #F93C3F;
  --green:        #51D560;

  --ink:          #191918;
  --ink-muted:    #575654;
  --ink-subtle:   #a09e9c;
  --surface:      #f4f2ef;
  --surface-mid:  #eceae6;
  --border:       #e2dfd9;

  --font-sans:    'Plus Jakarta Sans', system-ui, sans-serif;
  --topbar-h:     58px;
  --sidebar-w:    188px;
  --content-max:  720px;
  --page-max:     1160px;
}

/* ─── RESET ─── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.72;
  color: var(--ink);
  background: var(--white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ─── GLOBAL NAV ─── */
.topbar {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 200;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 2.5rem;
  background: rgba(254, 254, 254, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}

.topbar-brand {
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-decoration: none;
}

.topbar-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.topbar-nav a {
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--ink-muted);
  text-decoration: none;
  transition: color 0.18s ease;
}

.topbar-nav a:hover { color: var(--ink); }

.topbar-nav a.active { color: var(--ink); font-weight: 500; }

.topbar-back {
  font-size: 0.78rem;
  font-weight: 400;
  color: var(--ink-muted);
  display: flex;
  align-items: center;
  gap: 0.4rem;
  transition: color 0.18s;
}
.topbar-back:hover { color: var(--blue); }

/* ─── GLOBAL FOOTER ─── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-left {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.footer-name {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.footer-role {
  font-size: 0.7rem;
  font-weight: 300;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-subtle);
}

.footer-right {
  font-size: 0.76rem;
  font-weight: 300;
  color: var(--ink-subtle);
}

/* ─── CASE STUDY: HERO ─── */
.hero {
  margin-top: var(--topbar-h);
}

.hero-text {
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 4.5rem 2.5rem 3rem;
}

.hero-img {
  width: 100%;
  height: auto;
  display: block;
}

.hero-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.chip {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.3rem 0.8rem;
  border-radius: 100px;
  background: transparent;
  color: var(--ink-muted);
  border: 1px solid var(--border);
}

.chip-blue  { background: var(--blue);   border-color: var(--blue);   color: #fff; }
.chip-green { background: var(--green);  border-color: var(--green);  color: #fff; }

.hero-title {
  font-size: clamp(4rem, 9vw, 8rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--ink);
  line-height: 0.92;
  margin-bottom: 1.25rem;
}

.hero-sub {
  font-size: 1.05rem;
  font-weight: 300;
  color: var(--ink-muted);
  max-width: 520px;
  line-height: 1.65;
}

/* ─── CASE STUDY: LAYOUT ─── */
.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  max-width: var(--page-max);
  margin: 0 auto;
  padding: 0 2.5rem;
}

/* ─── SIDEBAR ─── */
.sidebar { padding-top: 5.5rem; }

.sidebar-inner {
  position: sticky;
  top: calc(var(--topbar-h) + 2.5rem);
}

.sidebar-eyebrow {
  font-size: 0.62rem;
  font-weight: 300;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-subtle);
  margin-bottom: 1.1rem;
}

.sidebar-nav { list-style: none; }
.sidebar-nav li + li { margin-top: 0.05rem; }

.sidebar-nav a {
  display: block;
  font-size: 0.82rem;
  font-weight: 400;
  color: var(--ink-subtle);
  text-decoration: none;
  padding: 0.32rem 0 0.32rem 0.85rem;
  border-left: 2px solid transparent;
  transition: color 0.18s ease, border-color 0.18s ease;
  cursor: pointer;
}

.sidebar-nav a:hover { color: var(--ink-muted); }

.sidebar-nav a.active {
  color: var(--ink);
  font-weight: 500;
  border-left-color: var(--blue);
}

/* ─── CONTENT COLUMN ─── */
.content {
  padding: 5.5rem 0 6rem 4.5rem;
  max-width: var(--content-max);
}

/* ─── SECTION SCAFFOLDING ─── */
.section { margin-bottom: 7.5rem; }

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 1.25rem;
}

.section-label::before {
  content: '';
  width: 18px;
  height: 2px;
  background: var(--blue);
  flex-shrink: 0;
}

.section-title {
  font-size: clamp(2.4rem, 4.5vw, 3.4rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.08;
  color: var(--ink);
  margin-bottom: 1.5rem;
}

.section-intro {
  font-size: 1.05rem;
  line-height: 1.78;
  color: var(--ink-muted);
  margin-bottom: 2.5rem;
  max-width: 60ch;
}

p { max-width: 63ch; margin-bottom: 1.2rem; }
p:last-child { margin-bottom: 0; }

h3 {
  font-size: 1.65rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-top: 3rem;
  margin-bottom: 1rem;
}

h4 {
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-subtle);
  margin-top: 2.25rem;
  margin-bottom: 0.6rem;
}

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

/* ─── META STRIP ─── */
.meta-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin: 2.5rem 0;
}

.meta-item { display: flex; flex-direction: column; gap: 0.2rem; }

.meta-val {
  font-size: 1.9rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--ink);
}

.meta-key {
  font-size: 0.68rem;
  font-weight: 300;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-subtle);
}

/* ─── IMAGES ─── */
.img-wrap { margin: 2.5rem 0; }

.img-wrap img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
  border: 1px solid var(--border);
}

.img-wrap.borderless img { border: none; background: transparent; }

.img-caption {
  margin-top: 0.7rem;
  font-size: 0.76rem;
  font-weight: 300;
  color: var(--ink);
  font-style: italic;
  line-height: 1.5;
}

.img-group { margin: 2.5rem 0; }

.img-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: start;
  gap: 0.85rem;
}

.img-group .img-grid-2 { margin: 0; }

.img-grid-2 .img-cell {
  border-radius: 8px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.img-grid-2 .img-cell img {
  width: 100%;
  height: auto;
  display: block;
}

/* ─── PLACEHOLDER UI BLOCKS ─── */
.ui-placeholder {
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--surface);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 3rem 2rem;
  text-align: center;
}

.ui-placeholder-label {
  font-size: 0.65rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-subtle);
}

.ui-placeholder-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink-muted);
}

/* ─── CALLOUT ─── */
.callout {
  margin: 2.5rem 0;
  padding: 1.75rem 2rem;
  background: var(--surface);
  border-left: 3px solid var(--blue);
  border-radius: 0 10px 10px 0;
}

.callout-eye {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.55rem;
}

.callout p {
  font-size: 1.03rem;
  line-height: 1.7;
  color: var(--ink);
  max-width: none;
  margin: 0;
}

/* ─── CARDS: PERSONAS ─── */
.persona-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 2rem 0;
}

.persona-card {
  padding: 1.75rem;
  border: 1px solid var(--border);
  border-radius: 10px;
}

.persona-name {
  font-size: 1.45rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 0.15rem;
}

.persona-meta {
  font-size: 0.76rem;
  font-weight: 300;
  color: var(--ink-subtle);
  line-height: 1.5;
  margin-bottom: 0.9rem;
}

.persona-goal {
  font-size: 0.9rem;
  color: var(--ink-muted);
  line-height: 1.6;
  max-width: none;
  margin: 0;
}

.persona-goal strong { color: var(--blue); font-weight: 500; }

/* ─── CARDS: INSIGHT GRID ─── */
.insight-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin: 2rem 0;
}

.insight-card {
  padding: 1.4rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
}

.insight-card-label {
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue);
  margin-bottom: 0.45rem;
}

.insight-card p {
  font-size: 0.87rem;
  color: var(--ink-muted);
  line-height: 1.62;
  max-width: none;
  margin: 0;
}

/* ─── LED LEGEND (Lumi specific, harmless on others) ─── */
.led-legend {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  margin: 1.75rem 0;
}

.led-row { display: flex; align-items: center; gap: 0.85rem; }

.led-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  flex-shrink: 0;
}

.led-row span { font-size: 0.9rem; color: var(--ink-muted); }

/* ─── DIVIDER ─── */
hr { border: none; border-top: 1px solid var(--border); margin: 4rem 0; }

/* ─── ANIMATIONS ─── */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.fade-up.visible { opacity: 1; transform: translateY(0); }

@media (prefers-reduced-motion: reduce) {
  .fade-up { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ─── CASE STUDY RESPONSIVE ─── */
@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; padding: 0 1.5rem; }
  .sidebar { display: none; }
  .content { padding: 3.5rem 0 5rem; max-width: 100%; }
  .hero-text { padding: 3rem 1.5rem 2.5rem; }
  .persona-row, .insight-grid { grid-template-columns: 1fr; }
  .img-grid-2 { grid-template-columns: 1fr; }
  .meta-strip { grid-template-columns: repeat(2, 1fr); }
  .topbar { padding: 0 1.5rem; }
}

@media (max-width: 540px) {
  .meta-strip { grid-template-columns: 1fr 1fr; }
  .site-footer { flex-direction: column; align-items: flex-start; gap: 1rem; }
  .topbar-nav { gap: 1.25rem; }
}