/* ===== Case Study page — matches janackeh.me brand ===== */
:root {
  --bg: #fbfbfd;
  --surface: #ffffff;
  --surface-2: #f5f5f7;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --faint: #86868b;
  --divider: #d2d2d7;
  --border: #e3e3e8;
  --accent: #b76e79;
  --accent-soft: #f7ebed;
  --accent-contrast: #ffffff;
  --code-bg: #1c1c1e;
  --code-text: #f5f5f7;
  --shadow: 0 1px 2px rgba(0,0,0,0.04), 0 8px 24px rgba(0,0,0,0.05);
}
[data-theme="dark"] {
  --bg: #000000;
  --surface: #0a0a0c;
  --surface-2: #161618;
  --text: #f5f5f7;
  --muted: #a1a1a6;
  --faint: #86868b;
  --divider: #1d1d1f;
  --border: #2a2a2e;
  --accent: #d99a9f;
  --accent-soft: #2a1a1c;
  --accent-contrast: #1a1011;
  --code-bg: #161618;
  --code-text: #f5f5f7;
  --shadow: 0 1px 2px rgba(0,0,0,0.4), 0 8px 24px rgba(0,0,0,0.5);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
  font-family: 'Satoshi', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background 0.3s ease, color 0.3s ease;
}

.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 200;
  background: var(--accent); color: var(--accent-contrast);
  padding: 0.6rem 1rem; border-radius: 0 0 8px 0; font-size: 0.85rem; font-weight: 500;
}
.skip-link:focus { left: 0; }

/* ===== Header ===== */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 78%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: 1180px; margin: 0 auto;
  height: 60px; padding: 0 1.5rem;
  display: flex; align-items: center; justify-content: space-between;
}
.brand-lockup { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; color: var(--text); }
.jmark {
  width: 28px; height: 28px; border-radius: 7px;
  background: var(--accent); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 16px; flex-shrink: 0;
}
.brand-name { font-weight: 500; font-size: 1rem; letter-spacing: -0.01em; }
.header-nav { display: flex; align-items: center; gap: 0.4rem; }
.nav-link {
  text-decoration: none; color: var(--muted); font-size: 0.92rem; font-weight: 400;
  padding: 0.5rem 0.85rem; border-radius: 8px; transition: color 0.2s, background 0.2s;
}
.nav-link:hover { color: var(--text); background: var(--surface-2); }
.theme-toggle {
  margin-left: 0.3rem; width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--border); background: var(--surface); color: var(--text);
  display: inline-flex; align-items: center; justify-content: center; cursor: pointer;
  transition: background 0.2s, border-color 0.2s, transform 0.2s;
}
.theme-toggle:hover { background: var(--surface-2); transform: translateY(-1px); }
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ===== Hero ===== */
.article { padding-top: 0; }
.cs-hero {
  max-width: 760px; margin: 0 auto; padding: clamp(3rem, 8vw, 5rem) 1.5rem 2rem;
  text-align: center;
}
.eyebrow {
  font-family: 'JetBrains Mono', monospace; font-size: 0.74rem; font-weight: 500;
  letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent);
  margin-bottom: 1.2rem;
}
.cs-title {
  font-weight: 900; font-size: clamp(2rem, 5vw, 3rem); line-height: 1.05;
  letter-spacing: -0.04em; margin-bottom: 1rem;
}
.cs-sub {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem); color: var(--muted); font-weight: 400;
  max-width: 620px; margin: 0 auto;
}
.cs-meta {
  margin-top: 1.6rem; display: flex; flex-wrap: wrap; gap: 0.5rem; justify-content: center;
  align-items: center; font-size: 0.82rem; color: var(--faint);
}
.meta-chip {
  padding: 0.3rem 0.7rem; border: 1px solid var(--border); border-radius: 999px;
  background: var(--surface); color: var(--muted); font-weight: 500;
}
.meta-dot { color: var(--divider); }

/* ===== Prose ===== */
.prose { max-width: 720px; margin: 0 auto; padding: 0 1.5rem 4rem; }
.lede {
  font-size: 1.15rem; color: var(--muted); line-height: 1.65;
  padding: 1.8rem 0; border-top: 1px solid var(--border); border-bottom: 1px solid var(--border);
  margin-bottom: 1rem;
}
.block { padding: 2.4rem 0; }
.block h2 {
  font-size: clamp(1.4rem, 3vw, 1.7rem); font-weight: 700; letter-spacing: -0.025em;
  margin-bottom: 1rem; line-height: 1.2;
}
.h3 { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.015em; margin: 2rem 0 0.8rem; }
.prose p { margin-bottom: 1.1rem; color: var(--text); }
.prose strong { font-weight: 700; color: var(--text); }
.prose em { font-style: italic; }

.pullquote {
  font-size: 1.3rem; font-weight: 500; letter-spacing: -0.015em; line-height: 1.4;
  color: var(--text); border-left: 3px solid var(--accent); padding-left: 1.1rem;
  margin: 1.6rem 0;
}

/* ===== Flow diagram ===== */
.flow {
  display: flex; flex-direction: column; align-items: stretch; gap: 0.4rem;
  margin: 1.5rem 0; max-width: 460px;
}
.flow-step {
  display: flex; align-items: center; gap: 0.9rem;
  background: var(--surface); border: 1px solid var(--border); border-radius: 12px;
  padding: 0.9rem 1.1rem; box-shadow: var(--shadow);
}
.flow-step.accent { border-color: var(--accent); background: var(--accent-soft); }
.flow-num {
  width: 26px; height: 26px; border-radius: 50%; background: var(--surface-2);
  color: var(--muted); font-size: 0.8rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.flow-step.accent .flow-num { background: var(--accent); color: var(--accent-contrast); }
.flow-label { font-size: 0.95rem; font-weight: 500; }
.flow-arrow { text-align: center; color: var(--faint); font-size: 1rem; line-height: 1; }
.callout {
  margin-top: 1.6rem; padding: 1.1rem 1.3rem; background: var(--accent-soft);
  border-radius: 12px; font-size: 0.98rem; color: var(--text); border-left: 3px solid var(--accent);
}

/* ===== Code card ===== */
.codecard {
  margin: 1.5rem 0; border: 1px solid var(--border); border-radius: 14px; overflow: hidden;
  box-shadow: var(--shadow);
}
.codecard-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 0.6rem 1rem; background: var(--surface-2); border-bottom: 1px solid var(--border);
}
.codecard-label { font-family: 'JetBrains Mono', monospace; font-size: 0.78rem; color: var(--faint); }
.copy-btn {
  font-family: 'JetBrains Mono', monospace; font-size: 0.75rem; font-weight: 500;
  color: var(--accent); background: transparent; border: 1px solid var(--accent);
  padding: 0.3rem 0.7rem; border-radius: 6px; cursor: pointer; transition: background 0.2s, color 0.2s;
}
.copy-btn:hover { background: var(--accent); color: var(--accent-contrast); }
.copy-btn.copied { background: var(--accent); color: var(--accent-contrast); }
.codeblock {
  margin: 0; padding: 1.2rem 1.3rem; overflow-x: auto;
  background: var(--code-bg); color: var(--code-text);
  font-family: 'JetBrains Mono', monospace; font-size: 0.82rem; line-height: 1.6;
  white-space: pre;
}
.codeblock code { font-family: inherit; }

/* ===== Choices list ===== */
.choices { list-style: none; margin: 1rem 0; display: flex; flex-direction: column; gap: 0.7rem; }
.choices li {
  padding-left: 1.4rem; position: relative; color: var(--text); line-height: 1.55;
}
.choices li::before {
  content: ""; position: absolute; left: 0; top: 0.62em;
  width: 6px; height: 6px; border-radius: 50%; background: var(--accent);
}
.choice-key { font-weight: 700; color: var(--text); }

/* ===== Before / after ===== */
.ba-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; margin: 1.5rem 0; }
.ba-card {
  border: 1px solid var(--border); border-radius: 14px; padding: 1.2rem;
  background: var(--surface); box-shadow: var(--shadow);
}
.ba-after { border-color: var(--accent); background: var(--accent-soft); }
.ba-tag {
  display: inline-block; font-family: 'JetBrains Mono', monospace; font-size: 0.7rem;
  font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 0.2rem 0.6rem; border-radius: 999px; margin-bottom: 0.7rem;
  background: var(--surface-2); color: var(--muted);
}
.ba-after .ba-tag { background: var(--accent); color: var(--accent-contrast); }
.ba-label { font-size: 0.82rem; color: var(--faint); margin-bottom: 0.6rem; font-style: italic; }
.ba-text { font-size: 0.9rem; line-height: 1.55; color: var(--text); margin-bottom: 0.6rem; }
.note-inline { font-size: 0.82rem; color: var(--faint); font-style: italic; margin-top: -0.3rem; }

/* ===== Steps ===== */
.steps { list-style: none; counter-reset: step; margin: 1.2rem 0; display: flex; flex-direction: column; gap: 0.6rem; }
.steps li { counter-increment: step; padding-left: 2.6rem; position: relative; color: var(--text); }
.steps li::before {
  content: counter(step); position: absolute; left: 0; top: 0;
  width: 1.7rem; height: 1.7rem; border-radius: 50%; background: var(--accent);
  color: var(--accent-contrast); font-size: 0.82rem; font-weight: 700;
  display: flex; align-items: center; justify-content: center;
}

/* ===== Stack ===== */
.stack-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 0.8rem; margin: 1.5rem 0; }
.stack-card {
  border: 1px solid var(--border); border-radius: 12px; padding: 1rem;
  background: var(--surface); box-shadow: var(--shadow);
  display: flex; flex-direction: column; gap: 0.25rem;
}
.stack-name { font-weight: 700; font-size: 0.95rem; }
.stack-role { font-size: 0.82rem; color: var(--muted); }

/* ===== CTA ===== */
.cta {
  margin-top: 2rem; padding: 2.2rem; border-radius: 18px; text-align: center;
  background: var(--accent-soft); border: 1px solid var(--accent);
}
.cta h2 { margin-bottom: 0.7rem; }
.cta p { color: var(--muted); max-width: 540px; margin: 0 auto 1.4rem; }
.cta-actions { display: flex; gap: 0.7rem; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; text-decoration: none; font-weight: 500; font-size: 0.95rem;
  padding: 0.7rem 1.3rem; border-radius: 999px; transition: transform 0.15s, background 0.2s, border-color 0.2s;
}
.btn:hover { transform: translateY(-1px); }
.btn-solid { background: var(--accent); color: var(--accent-contrast); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--accent); }

.disclaimer { font-size: 0.8rem; color: var(--faint); margin-top: 2.5rem; text-align: center; }

/* ===== Footer ===== */
.site-footer { border-top: 1px solid var(--border); background: var(--surface); }
.footer-inner {
  max-width: 1180px; margin: 0 auto; padding: 1.4rem 1.5rem;
  display: flex; flex-wrap: wrap; gap: 0.8rem 1.4rem; align-items: center; justify-content: space-between;
}
.footer-back { text-decoration: none; color: var(--accent); font-weight: 500; font-size: 0.9rem; }
.footer-link { text-decoration: none; color: var(--muted); font-size: 0.9rem; transition: color 0.2s; }
.footer-link:hover { color: var(--text); }

/* ===== Reveal ===== */
html.cs-ready .reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }
html.cs-ready .reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html.cs-ready .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ===== Responsive ===== */
@media (max-width: 720px) {
  .ba-grid { grid-template-columns: 1fr; }
  .stack-grid { grid-template-columns: 1fr; }
  .header-nav .nav-link { display: none; }
  .brand-name { display: none; }
  .cta { padding: 1.6rem 1.2rem; }
  .flow { max-width: 100%; }
}