/* =========================================================
   DriftSense case study
   Green + black product theme inside the portfolio aesthetic
   ========================================================= */

:root {
  --ds-green: #1F7A53;
  --ds-green-deep: #145C3D;
  --ds-ink: #0E1512;
  --ds-mint: #E4F0EA;
  --ds-mint-line: #CBE3D7;
}

/* Back link */
.ds-back {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--muted);
  margin-bottom: 24px;
}
.ds-back:hover { color: var(--ink); }
.ds-back svg { width: 14px; height: 14px; }

/* ---------- Hero ---------- */
.ds-hero {
  padding: clamp(28px, 4vw, 56px) 0 clamp(40px, 5vw, 72px);
}
.ds-hero__eyebrow {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--ds-green);
  margin-bottom: 22px;
  display: inline-flex; align-items: center; gap: 10px;
}
.ds-hero__eyebrow::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--ds-green); }
.ds-hero__title {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(40px, 6vw, 84px); line-height: 1.06; letter-spacing: -0.02em;
  max-width: 16ch; margin-bottom: 30px;
}
.ds-hero__title em { font-style: italic; color: var(--ds-green); }
.ds-hero__sub {
  font-size: clamp(16px, 1.3vw, 20px); line-height: 1.5; color: var(--ink-soft);
  max-width: 60ch; margin-bottom: 32px;
}
.ds-hero__meta {
  display: flex; flex-wrap: wrap; gap: clamp(20px, 4vw, 56px);
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--muted);
  padding-top: 24px; border-top: 1px solid var(--line);
}
.ds-hero__meta dt { margin-bottom: 5px; }
.ds-hero__meta dd { margin: 0; color: var(--ink); font-family: var(--sans); font-size: 14px; letter-spacing: 0; text-transform: none; }

/* Cover */
.ds-cover {
  margin-top: clamp(32px, 4vw, 56px);
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--ds-ink);
  box-shadow: 0 32px 80px -48px rgba(14,21,18,0.5);
}
.ds-cover img { width: 100%; height: auto; display: block; }

/* ---------- Section scaffold ---------- */
.ds-section { padding: clamp(56px, 7vw, 100px) 0; border-top: 1px solid var(--line); }
.ds-section--mint { background: linear-gradient(180deg, #F4FAF7, var(--bg)); }
.ds-section--ink { background: var(--ds-ink); color: #EAF1ED; border-top: 0; }
.ds-label {
  display: flex; align-items: center; gap: 14px;
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--ink);
  margin-bottom: clamp(28px, 4vw, 44px);
}
.ds-section--ink .ds-label { color: #8FB3A2; }
.ds-label__num { color: var(--ds-green); }
.ds-label__rule { flex: 1; height: 1px; background: var(--line); }
.ds-section--ink .ds-label__rule { background: rgba(255,255,255,0.12); }

.ds-h2 {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(28px, 3.4vw, 46px); line-height: 1.04; letter-spacing: -0.015em;
  margin-bottom: 20px; max-width: 24ch;
}
.ds-h2 em { font-style: italic; color: var(--ds-green); }
.ds-section--ink .ds-h2 em { color: #5FC79A; }
.ds-lead { font-size: clamp(16px, 1.2vw, 18px); line-height: 1.6; color: var(--ink-soft); max-width: 64ch; }
.ds-section--ink .ds-lead { color: #B6C7BF; }
.ds-two {
  display: grid; grid-template-columns: 0.85fr 1.15fr; gap: clamp(32px, 5vw, 72px);
  align-items: start;
}
@media (max-width: 880px) { .ds-two { grid-template-columns: 1fr; } }

/* ---------- Overview stats ---------- */
.ds-stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: var(--radius);
  overflow: hidden; margin-top: clamp(32px, 4vw, 48px);
}
@media (max-width: 720px) { .ds-stats { grid-template-columns: 1fr 1fr; } }
.ds-stat { background: var(--bg); padding: 26px 22px; }
.ds-stat__v { font-family: var(--serif); font-size: clamp(30px, 3.6vw, 44px); line-height: 1; color: var(--ds-green); }
.ds-stat__l { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--muted); margin-top: 10px; }

/* ---------- Persona ---------- */
.ds-persona {
  display: grid; grid-template-columns: 0.7fr 1.3fr; gap: 0;
  border: 1px solid var(--line); border-radius: var(--radius-lg); overflow: hidden;
  background: var(--bg);
}
@media (max-width: 760px) { .ds-persona { grid-template-columns: 1fr; } }
.ds-persona__side {
  background: var(--ds-ink); color: #EAF1ED; padding: clamp(28px, 3vw, 40px);
  display: flex; flex-direction: column; gap: 18px;
}
.ds-persona__avatar {
  width: 76px; height: 76px; border-radius: 50%;
  background: linear-gradient(145deg, var(--ds-green), var(--ds-green-deep));
  display: flex; align-items: center; justify-content: center;
  font-family: var(--serif); font-size: 32px; color: #fff;
}
.ds-persona__name { font-family: var(--serif); font-size: 28px; line-height: 1; }
.ds-persona__role { font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: #8FB3A2; margin-top: 4px; }
.ds-persona__facts { display: grid; gap: 12px; margin-top: 6px; }
.ds-persona__facts div { font-size: 13px; color: #B6C7BF; display: flex; gap: 10px; }
.ds-persona__facts b { color: #EAF1ED; font-weight: 500; min-width: 64px; display: inline-block; font-family: var(--mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; padding-top: 2px; }
.ds-persona__body { padding: clamp(28px, 3vw, 40px); display: grid; gap: 24px; align-content: start; }
.ds-pcol h4 {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase;
  color: var(--ds-green); margin-bottom: 12px;
}
.ds-pcol ul { display: grid; gap: 8px; }
.ds-pcol li { font-size: 14.5px; line-height: 1.5; color: var(--ink-soft); padding-left: 18px; position: relative; }
.ds-pcol li::before { content: ""; position: absolute; left: 0; top: 9px; width: 6px; height: 6px; border-radius: 50%; background: var(--ds-mint-line); }
.ds-pquote {
  font-family: var(--serif); font-style: italic; font-size: 19px; line-height: 1.4;
  color: var(--ink); border-left: 2px solid var(--ds-green); padding-left: 18px;
}

/* ---------- UX architecture diagram ---------- */
.ds-arch {
  border: 1px solid var(--line); border-radius: var(--radius-lg); background: var(--bg);
  padding: clamp(20px, 2.4vw, 32px);
  overflow-x: auto;
}
.ds-arch svg { width: 100%; height: auto; min-width: 720px; display: block; }

/* ---------- Screens gallery ---------- */
.ds-gallery { display: grid; gap: clamp(20px, 2.4vw, 32px); }
.ds-shot {
  border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden;
  background: var(--bg);
}
.ds-shot__cap {
  display: flex; align-items: baseline; gap: 12px; flex-wrap: wrap;
  padding: 16px 20px; border-bottom: 1px solid var(--line);
}
.ds-shot__n { font-family: var(--serif); font-size: 20px; letter-spacing: -0.01em; }
.ds-shot__d { font-size: 13px; color: var(--muted); }
.ds-shot__img { background: #F3F4F2; }
.ds-shot__img img { width: 100%; height: auto; display: block; }

.ds-gallery--two { grid-template-columns: 1fr 1fr; }
@media (max-width: 820px) { .ds-gallery--two { grid-template-columns: 1fr; } }

/* ---------- Build-with-AI band ---------- */
.ds-build {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(16px, 2vw, 24px);
}
@media (max-width: 880px) { .ds-build { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .ds-build { grid-template-columns: 1fr; } }
.ds-build__card {
  border: 1px solid rgba(255,255,255,0.12); border-radius: var(--radius);
  padding: 26px 22px; background: rgba(255,255,255,0.03);
}
.ds-build__ic { width: 36px; height: 36px; color: #5FC79A; margin-bottom: 16px; }
.ds-build__ic svg { width: 100%; height: 100%; }
.ds-build__n { font-family: var(--serif); font-size: 21px; margin-bottom: 8px; color: #EAF1ED; }
.ds-build__d { font-size: 13.5px; line-height: 1.5; color: #9FB6AC; }

/* ---------- Next ---------- */
.ds-next {
  display: grid; grid-template-columns: 1fr 1fr; gap: 20px;
  padding: clamp(40px, 6vw, 80px) 0; border-top: 1px solid var(--line);
}
@media (max-width: 720px) { .ds-next { grid-template-columns: 1fr; } }
.ds-next a {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 30px;
  transition: border-color var(--t-fast), background var(--t-fast);
}
.ds-next a:hover { border-color: var(--ink); background: var(--bg-alt); }
.ds-next .eyebrow { display: block; margin-bottom: 8px; }
.ds-next h3 { font-family: var(--serif); font-weight: 400; font-size: 26px; }