/* ==========================================================================
   Luma Design — site styles
   Plain CSS, no build step. Light/dark aware via prefers-color-scheme.
   ========================================================================== */

:root {
  /* Light theme (default) */
  --bg:            #f6f7f9;
  --bg-elev:       #ffffff;
  --panel:         rgba(255, 255, 255, 0.62);
  --panel-border:  rgba(15, 23, 42, 0.08);
  --panel-hi:      rgba(255, 255, 255, 0.9);
  --text:          #0f1729;
  --text-muted:    #56617a;
  --text-faint:    #8a93a8;
  --accent:        #4f6bff;
  --accent-2:      #37c4c0;
  --accent-soft:   rgba(79, 107, 255, 0.12);
  --ring:          rgba(79, 107, 255, 0.35);
  --hairline:      rgba(15, 23, 42, 0.10);
  --shadow:        0 1px 2px rgba(15,23,42,.06), 0 12px 32px rgba(15,23,42,.08);
  --shadow-lift:   0 2px 6px rgba(15,23,42,.08), 0 24px 60px rgba(15,23,42,.14);

  --maxw: 1080px;
  --radius: 18px;
  --radius-sm: 12px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "SF Mono", "JetBrains Mono", ui-monospace, "Menlo", "Consolas", monospace;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg:           #080a12;
    --bg-elev:      #0e1120;
    --panel:        rgba(24, 29, 48, 0.55);
    --panel-border: rgba(148, 163, 210, 0.14);
    --panel-hi:     rgba(120, 140, 210, 0.10);
    --text:         #eef1f8;
    --text-muted:   #a2acc7;
    --text-faint:   #6c7590;
    --accent:       #7d92ff;
    --accent-2:     #4fd7d2;
    --accent-soft:  rgba(125, 146, 255, 0.14);
    --ring:         rgba(125, 146, 255, 0.45);
    --hairline:     rgba(148, 163, 210, 0.12);
    --shadow:       0 1px 2px rgba(0,0,0,.4), 0 16px 40px rgba(0,0,0,.45);
    --shadow-lift:  0 2px 8px rgba(0,0,0,.5), 0 30px 70px rgba(0,0,0,.6);
  }
}

/* ---------- reset-ish ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; margin: 0; }
p { margin: 0; }

/* ---------- ambient background field ---------- */
.bg-field {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}
.bg-field::before,
.bg-field::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
}
.bg-field::before {
  width: 60vw; height: 60vw;
  top: -22vw; left: -12vw;
  background: radial-gradient(circle at 30% 30%, var(--accent), transparent 62%);
}
.bg-field::after {
  width: 52vw; height: 52vw;
  top: -8vw; right: -16vw;
  background: radial-gradient(circle at 60% 40%, var(--accent-2), transparent 62%);
  opacity: 0.42;
}
@media (prefers-color-scheme: dark) {
  .bg-field::before { opacity: 0.32; }
  .bg-field::after  { opacity: 0.26; }
}

/* ---------- layout ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}
section { padding: clamp(56px, 9vw, 104px) 0; }

/* ---------- glass panel ---------- */
.glass {
  position: relative;
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
}
/* refractive top edge highlight */
.glass::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(180deg, var(--panel-hi), transparent 40%);
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
          mask-composite: exclude;
  pointer-events: none;
}

/* ---------- header / nav ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--hairline);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  font-weight: 650;
  letter-spacing: -0.01em;
  font-size: 1.02rem;
}
.brand .mark {
  width: 26px; height: 26px;
  flex: none;
  border-radius: 8px;
  background: conic-gradient(from 210deg, var(--accent), var(--accent-2), var(--accent));
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.25), 0 4px 14px var(--accent-soft);
  position: relative;
}
.brand .mark::after {
  content: "";
  position: absolute; inset: 6px;
  border-radius: 4px;
  background: var(--bg-elev);
  opacity: .55;
}
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  color: var(--text-muted);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 9px;
  transition: color .15s ease, background .15s ease;
}
.nav-links a:hover { color: var(--text); background: var(--accent-soft); }
.nav-links a.cta {
  color: var(--text);
  border: 1px solid var(--panel-border);
  background: var(--panel);
}
.nav-links a.cta:hover { border-color: var(--ring); }

/* ---------- hero ---------- */
.hero { padding-top: clamp(64px, 10vw, 120px); padding-bottom: clamp(40px, 6vw, 72px); }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 550;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.eyebrow .dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--accent-2);
  box-shadow: 0 0 0 4px var(--accent-soft);
}
.hero h1 {
  font-size: clamp(2.5rem, 6.4vw, 4.4rem);
  font-weight: 700;
  margin: 26px 0 0;
  max-width: 15ch;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text;
          background-clip: text;
  color: transparent;
}
.hero .subhead {
  font-size: clamp(1.06rem, 2.1vw, 1.28rem);
  color: var(--text-muted);
  max-width: 56ch;
  margin: 22px 0 0;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
  font-weight: 550;
  padding: 12px 20px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .15s ease, box-shadow .15s ease, background .15s ease;
}
.btn-primary {
  color: #fff;
  background: linear-gradient(120deg, var(--accent), color-mix(in srgb, var(--accent) 60%, var(--accent-2)));
  box-shadow: 0 8px 24px var(--accent-soft);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 12px 30px var(--accent-soft); }
.btn-ghost {
  color: var(--text);
  border-color: var(--panel-border);
  background: var(--panel);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}
.btn-ghost:hover { border-color: var(--ring); transform: translateY(-1px); }

/* ---------- intro strip ---------- */
.intro { padding-top: clamp(24px, 4vw, 40px); }
.intro .glass { padding: clamp(28px, 4vw, 44px); }
.intro h2 {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-faint);
  font-weight: 600;
  margin-bottom: 14px;
}
.intro p { font-size: clamp(1.02rem, 1.7vw, 1.18rem); color: var(--text-muted); max-width: 72ch; }
.intro p strong { color: var(--text); font-weight: 600; }

/* ---------- section heading ---------- */
.section-head { max-width: 60ch; margin-bottom: 40px; }
.section-head .kicker {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  font-weight: 600;
}
.section-head h2 { font-size: clamp(1.7rem, 3.4vw, 2.4rem); margin-top: 10px; }
.section-head p { color: var(--text-muted); margin-top: 12px; font-size: 1.05rem; }

/* ---------- project cards ---------- */
.projects { display: grid; gap: 22px; }
.project-card {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 0;
  overflow: hidden;
  transition: transform .2s ease, box-shadow .2s ease;
}
.project-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-lift); }
.project-card:nth-child(even) .pc-media { order: 2; }
.pc-body { padding: clamp(26px, 3.4vw, 40px); display: flex; flex-direction: column; }
.pc-index {
  font-family: var(--mono);
  font-size: 0.8rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
}
.pc-body h3 { font-size: clamp(1.35rem, 2.6vw, 1.75rem); margin-top: 8px; }
.pc-tag {
  display: inline-block;
  align-self: flex-start;
  margin-top: 14px;
  font-size: 0.76rem;
  font-weight: 550;
  letter-spacing: 0.02em;
  color: var(--accent);
  padding: 4px 11px;
  border-radius: 999px;
  background: var(--accent-soft);
}
.pc-body p { color: var(--text-muted); margin-top: 16px; flex: 1; }
.pc-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  margin-top: 22px;
  font-weight: 550;
  font-size: 0.94rem;
  color: var(--accent);
}
.pc-link .arrow { transition: transform .15s ease; }
.project-card:hover .pc-link .arrow { transform: translateX(3px); }

/* media / screenshot placeholder */
.pc-media {
  position: relative;
  min-height: 260px;
  background:
    linear-gradient(135deg, var(--accent-soft), transparent 60%),
    var(--bg-elev);
  border-left: 1px solid var(--hairline);
  display: flex;
  align-items: center;
  justify-content: center;
}
.project-card:nth-child(even) .pc-media { border-left: 0; border-right: 1px solid var(--hairline); }
.pc-media img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }

.placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-faint);
  font-family: var(--mono);
  font-size: 0.78rem;
  text-align: center;
  padding: 24px;
}
.placeholder svg { width: 34px; height: 34px; opacity: .5; }
.placeholder .dim { opacity: .7; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding: 48px 0 40px;
  margin-top: 40px;
}
.footer-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 28px;
}
.footer-brand { max-width: 34ch; }
.footer-brand .brand { margin-bottom: 12px; }
.footer-brand p { color: var(--text-muted); font-size: 0.92rem; }
.footer-col h4 {
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-faint);
  margin: 0 0 12px;
  font-weight: 600;
}
.footer-col a, .footer-col span {
  display: block;
  color: var(--text-muted);
  font-size: 0.92rem;
  padding: 3px 0;
  transition: color .15s ease;
}
.footer-col a:hover { color: var(--text); }
.footer-legal {
  margin-top: 36px;
  padding-top: 22px;
  border-top: 1px solid var(--hairline);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  color: var(--text-faint);
  font-size: 0.85rem;
}

/* ==========================================================================
   Case-study page
   ========================================================================== */
.case-hero { padding-top: clamp(48px, 7vw, 84px); padding-bottom: clamp(24px, 4vw, 40px); }
.back-link {
  display: inline-flex; align-items: center; gap: 7px;
  color: var(--text-muted); font-size: 0.9rem; font-weight: 500;
  margin-bottom: 26px;
}
.back-link:hover { color: var(--text); }
.case-hero h1 { font-size: clamp(2.1rem, 5vw, 3.3rem); font-weight: 700; margin-top: 14px; max-width: 20ch; }
.case-hero .lede { font-size: clamp(1.1rem, 2vw, 1.35rem); color: var(--text-muted); max-width: 62ch; margin-top: 18px; }
.case-meta { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 24px; }
.case-meta .chip {
  font-size: 0.8rem; font-weight: 550; color: var(--text-muted);
  padding: 6px 13px; border-radius: 999px;
  border: 1px solid var(--panel-border); background: var(--panel);
}

.case-figure { margin: clamp(20px, 4vw, 40px) 0; }
.case-figure .frame {
  border-radius: var(--radius);
  overflow: hidden;
  min-height: clamp(240px, 42vw, 480px);
  background:
    linear-gradient(135deg, var(--accent-soft), transparent 55%),
    var(--bg-elev);
  border: 1px solid var(--hairline);
  display: flex; align-items: center; justify-content: center;
  position: relative;
}
.case-figure figcaption { color: var(--text-faint); font-size: 0.85rem; margin-top: 10px; text-align: center; }
/* When a real image/mockup is present, let it fill the frame at natural aspect */
.case-figure .frame:has(img) { min-height: 0; }
.case-figure .frame img { width: 100%; height: auto; display: block; }

.case-body { display: grid; grid-template-columns: 1fr; gap: clamp(28px, 5vw, 52px); max-width: 820px; margin: 0 auto; }
.case-block h2 { font-size: clamp(1.3rem, 2.6vw, 1.7rem); margin-bottom: 14px; }
.case-block h2 .num { color: var(--accent); font-family: var(--mono); font-size: 0.7em; margin-right: 10px; }
.case-block p { color: var(--text-muted); font-size: 1.06rem; }
.case-block + .case-block { padding-top: clamp(28px, 5vw, 52px); border-top: 1px solid var(--hairline); }

.outcome-card { padding: clamp(24px, 4vw, 36px); }
.outcome-card .kicker { color: var(--accent-2); font-weight: 600; font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.1em; }
.outcome-card p { color: var(--text); font-size: clamp(1.1rem, 2vw, 1.3rem); margin-top: 12px; font-weight: 450; }

.case-nav {
  display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap;
  margin-top: clamp(40px, 6vw, 72px);
}
.case-nav a {
  flex: 1 1 240px;
  padding: 20px 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--panel-border);
  background: var(--panel);
  transition: border-color .15s ease, transform .15s ease;
}
.case-nav a:hover { border-color: var(--ring); transform: translateY(-2px); }
.case-nav .dir { font-size: 0.78rem; color: var(--text-faint); text-transform: uppercase; letter-spacing: 0.08em; }
.case-nav .title { font-weight: 600; margin-top: 4px; display: block; }
.case-nav .next { text-align: right; }

/* ---------- reveal-on-scroll ---------- */
.reveal { opacity: 0; transform: translateY(16px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- responsive ---------- */
@media (max-width: 760px) {
  .nav-links a:not(.cta) { display: none; }
  .project-card { grid-template-columns: 1fr; }
  .project-card .pc-media,
  .project-card:nth-child(even) .pc-media { order: -1; border: 0; border-bottom: 1px solid var(--hairline); min-height: 200px; }
  .footer-grid { flex-direction: column; }
}