/* ============================================================
   Case Studies — matched to portfolio.richardbirley.co.uk
   Montserrat · #28425A navy · #178E64 green · #b7b7b7 body
   Mirrors the original site's tokens & signature components.
   ============================================================ */

:root{
  --bg:#28425A;
  --bg-2:#223a50;
  --body:#b7b7b7;
  --white:#fffefe;
  --green:#178E64;
  --green-d:#12744f;
  --panel:#CCDAE7;
  --panel-2:#E3E8EC;
  --line:rgba(255,255,255,.18);
  --panel-soft:rgba(255,255,255,.06);
  --panel-hover:rgba(204,218,231,.14);
  --dark:#1c1c1c;
  --maxw:1170px;
  --prose:760px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  font-family:'Montserrat',-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;
  font-size:15px;line-height:1.6;color:var(--body);background-color:var(--bg);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--body);text-decoration:none;transition:all .3s}
h1,h2,h3,h4,h5,h6{font-family:'Montserrat',sans-serif;font-weight:400;line-height:1.15;color:var(--white)}
strong{color:var(--white);font-weight:600}
em{font-style:italic}
ul{list-style:none}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}
.prose{max-width:var(--prose);margin:0 auto}
.block{padding:60px 0}
.block-lg{padding:95px 0}
.rule{height:1px;background:var(--line);border:0;max-width:var(--maxw);margin:0 auto}
.center{text-align:center}

/* ---------- nav ---------- */
.nav{position:sticky;top:0;z-index:50;background:rgba(40,66,90,.92);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav-inner{max-width:var(--maxw);margin:0 auto;padding:18px 24px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{font-size:17px;font-weight:600;color:var(--white);text-transform:uppercase;letter-spacing:.05em;display:flex;align-items:center}
.brand img{height:32px;width:32px;display:block}
.brand .dot{color:var(--green)}
.nav-links{display:flex;gap:28px;align-items:center;font-size:13px;text-transform:uppercase;letter-spacing:.12em;font-weight:500}
.nav-links a{color:var(--body)}
.nav-links a:hover,.nav-links a.active{color:var(--green)}
.nav-back{font-size:13px;text-transform:uppercase;letter-spacing:.12em;color:var(--body);font-weight:500}
.nav-back:hover{color:var(--green)}
@media(max-width:640px){.nav-links{display:none}}

/* ---------- signature heading (uppercase + underline + green sublabel) ---------- */
.heading{text-align:center;margin-bottom:50px}
.heading.left{text-align:left}
.heading .inner{display:inline-block;position:relative}
.heading h1,.heading h2{font-size:40px;text-transform:uppercase;font-weight:500;color:var(--white);padding-bottom:15px;position:relative;margin:0;letter-spacing:.01em}
.heading h1:after,.heading h2:after{content:"";position:absolute;background:var(--green);width:100%;height:2px;top:100%;left:0}
.heading .sub{position:absolute;right:0;bottom:-10px;background:var(--bg);padding-left:12px;color:var(--green);font-weight:600;text-transform:uppercase;font-size:14px;letter-spacing:.04em}
@media(max-width:560px){.heading h1,.heading h2{font-size:30px}}

/* ---------- eyebrow ---------- */
.eyebrow{font-size:12px;font-weight:600;letter-spacing:.16em;text-transform:uppercase;color:var(--green);margin-bottom:18px;display:inline-flex;align-items:center;gap:10px}
.eyebrow::before{content:"";width:26px;height:2px;background:var(--green);display:inline-block}

/* ---------- hero ---------- */
.hero{padding:80px 0 40px}
.hero h1{font-size:clamp(40px,7vw,84px);text-transform:uppercase;font-weight:700;color:var(--white);line-height:1.02;letter-spacing:.005em}
.lede{font-size:clamp(16px,2vw,20px);line-height:1.65;color:var(--body);font-weight:400}
.hero-meta{display:flex;flex-wrap:wrap;gap:10px 26px;margin-top:30px;font-size:13px;color:var(--body)}
.hero-meta b{color:var(--white);font-weight:600;text-transform:uppercase;letter-spacing:.06em;font-size:12px}
.hero-meta .dot{color:var(--green)}
@media(max-width:640px){.hero,.block-lg{padding-left:24px;padding-right:24px}}
p{margin-bottom:20px}
.prose p{font-size:16px}

/* ---------- buttons ---------- */
.btn{height:50px;line-height:50px;color:var(--white);font-size:14px;font-weight:500;padding:0 26px;min-width:150px;display:inline-block;text-align:center;text-transform:capitalize;background:var(--green);border:1px solid var(--green);cursor:pointer}
.btn:hover{color:var(--green);background:var(--panel);border-color:var(--green)}
.btn-ghost{background:transparent;color:var(--white);border-color:var(--line)}
.btn-ghost:hover{background:var(--green);border-color:var(--green);color:var(--white)}

/* ---------- chips ---------- */
.chips{display:flex;flex-wrap:wrap;gap:9px;margin-top:24px}
.chip{font-size:12px;font-weight:500;text-transform:uppercase;letter-spacing:.06em;color:var(--body);background:var(--panel-soft);border:1px solid var(--line);padding:8px 14px}
.chip.solid{background:var(--green);color:var(--white);border-color:var(--green)}

/* ---------- metrics ---------- */
.metrics{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--line);border:1px solid var(--line)}
.metrics.three{grid-template-columns:repeat(3,1fr)}
.metric{background:var(--bg);padding:32px 24px;transition:background .3s}
.metric:hover{background:var(--bg-2)}
.metric .num{font-size:clamp(30px,4vw,46px);font-weight:600;color:var(--white);line-height:1;transition:color .3s}
.metric:hover .num{color:var(--green)}
.metric .num .u{font-size:.5em;color:var(--body);font-weight:500;margin-left:2px}
.metric .lbl{margin-top:14px;font-size:13px;line-height:1.45;color:var(--body)}
.metric.accent .num{color:var(--green)}
@media(max-width:820px){.metrics,.metrics.three{grid-template-columns:repeat(2,1fr)}}
@media(max-width:460px){.metrics,.metrics.three{grid-template-columns:1fr}}

/* ---------- figures ---------- */
figure{margin:40px 0}
.fig-frame{border:1px solid var(--line);overflow:hidden;background:var(--panel)}
.fig-frame img{width:100%;display:block}
figcaption{margin-top:14px;font-size:13px;color:var(--body);max-width:660px;line-height:1.55}
figcaption b{color:var(--white);font-weight:600}

/* ---------- pull quote ---------- */
.pull{font-size:clamp(22px,3vw,30px);line-height:1.3;color:var(--white);font-weight:500;border-left:3px solid var(--green);padding:6px 0 6px 28px;margin:46px auto;max-width:800px}

/* ---------- timeline (matches original .prt_about_learnsection) ---------- */
.tl{position:relative;z-index:1;padding-top:10px}
.tl::after{content:"";position:absolute;background:var(--white);width:2px;top:0;bottom:0;left:0;right:0;margin:0 auto;z-index:-1}
.tl-row{display:flex;flex-wrap:wrap}
.tl-box{width:50%;position:relative;padding:30px 0;margin-bottom:20px}
.tl-box .card{background:var(--panel-soft);padding:28px 30px;transition:background .3s;position:relative}
.tl-box:hover .card{background:var(--panel-hover)}
.tl-left{padding-right:52px;text-align:right}
.tl-right{padding-left:52px;margin-left:50%}
.tl-box::after{content:"";position:absolute;background:var(--bg);width:16px;height:16px;border-radius:100%;border:3px solid var(--white);top:50%;margin-top:-8px;transition:all .3s}
.tl-left::after{right:-8px}
.tl-right::after{left:-8px}
.tl-box:hover::after{background:var(--white);border-color:var(--green)}
.tl-year{font-size:20px;font-weight:600;color:var(--green);text-transform:uppercase;letter-spacing:.08em;margin-bottom:8px}
.tl-box .card h3{font-size:19px;text-transform:uppercase;color:var(--white);margin-bottom:12px;font-weight:500;letter-spacing:.02em}
.tl-box .card p{font-size:14.5px;margin-bottom:0;color:var(--body)}
.tl-box .card ul{margin-top:6px}
.tl-box .card li{font-size:14.5px;color:var(--body);padding-left:16px;position:relative;margin-bottom:7px;text-align:left}
.tl-right .card li,.tl-right .card{text-align:left}
.tl-box .card li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;background:var(--green);border-radius:50%}
.tl-left .card li{text-align:right;padding-left:0;padding-right:16px}
.tl-left .card li::before{left:auto;right:0}
.tl-left .card ul{display:inline-block}
@media(max-width:768px){
  .tl::after{left:7px;right:auto;margin:0}
  .tl-box{width:100%;padding:16px 0}
  .tl-left,.tl-right{padding:0 0 0 34px;text-align:left;margin-left:0}
  .tl-left::after,.tl-right::after{left:-1px;right:auto}
  .tl-left .card,.tl-left .card li{text-align:left;padding-left:16px;padding-right:0}
  .tl-left .card li::before{left:0;right:auto}
  .tl-left .card ul{display:block}
}

/* ---------- now / next ---------- */
.nn{display:grid;grid-template-columns:1fr 1fr;gap:22px}
.nn-col{background:var(--panel-soft);border:1px solid var(--line);padding:30px;transition:background .3s}
.nn-col:hover{background:var(--panel-hover)}
.nn-tag{display:inline-flex;align-items:center;gap:9px;font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;margin-bottom:18px}
.nn-tag .sq{width:11px;height:11px;display:inline-block}
.nn-now .nn-tag{color:var(--green)} .nn-now .sq{background:var(--green)}
.nn-next .nn-tag{color:var(--panel)} .nn-next .sq{background:var(--panel)}
.nn-col ul{display:flex;flex-direction:column;gap:14px}
.nn-col li{font-size:14.5px;color:var(--body);padding-left:20px;position:relative;line-height:1.5;text-align:left}
.nn-col li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--white);opacity:.4}
.nn-col li b{color:var(--white)}
.nn-col .htag{color:var(--green);font-size:11px;font-weight:600;text-transform:uppercase;letter-spacing:.05em}
@media(max-width:720px){.nn{grid-template-columns:1fr}}

/* ---------- split / def list ---------- */
.split{display:grid;grid-template-columns:.8fr 1.2fr;gap:48px;align-items:start}
@media(max-width:800px){.split{grid-template-columns:1fr;gap:24px}}
.stack{display:flex;flex-direction:column;gap:18px}
.def{border-top:1px solid var(--line);padding-top:16px}
.def dt{font-size:12px;font-weight:600;letter-spacing:.08em;text-transform:uppercase;color:var(--green);margin-bottom:6px}
.def dd{font-size:15px;color:var(--body)}

/* ---------- steps ---------- */
.steps{counter-reset:s;display:flex;flex-direction:column;gap:26px}
.step{display:grid;grid-template-columns:auto 1fr;gap:22px;align-items:start}
.step .n{counter-increment:s;font-size:15px;font-weight:600;color:var(--white);background:var(--green);width:42px;height:42px;display:grid;place-items:center}
.step .n::before{content:counter(s,decimal-leading-zero)}
.step h3{font-size:17px;text-transform:uppercase;margin-bottom:5px;font-weight:500;letter-spacing:.02em}
.step p{font-size:15px;margin-bottom:0}

/* ---------- note ---------- */
.note{background:var(--panel-soft);border:1px solid var(--line);border-left:3px solid var(--green);padding:20px 24px;font-size:14.5px;color:var(--body);margin:30px 0}
.note b{color:var(--white)}

/* ---------- route table ---------- */
.rt{width:100%;border-collapse:collapse;font-size:14px;border:1px solid var(--line)}
.rt th,.rt td{text-align:left;padding:16px 18px;border-bottom:1px solid var(--line)}
.rt thead th{font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--green);font-weight:600;background:var(--panel-soft)}
.rt tbody tr:last-child td{border-bottom:none}
.rt .rname{font-weight:600;color:var(--white);text-transform:uppercase;letter-spacing:.02em}
.rt .path{color:var(--body);font-size:12.5px}
.rt .v{font-size:19px;font-weight:600;color:var(--white)}
.rt .best{color:var(--green)}
.rt td{color:var(--body)}
.rt tr.win{background:rgba(23,142,100,.12)}
@media(max-width:720px){.rt .path{display:none}}

/* ---------- key achievements ---------- */
.ka{border:1px solid var(--line);background:var(--panel-soft);padding:46px}
.ka-grid{display:grid;grid-template-columns:1fr 1fr;gap:28px 48px;margin-top:28px}
.ka-item{display:flex;gap:18px;align-items:flex-start}
.ka-item .k{font-size:30px;font-weight:600;color:var(--green);line-height:1;min-width:110px;text-transform:uppercase}
.ka-item .k .u{font-size:.5em;color:var(--body);font-weight:500}
.ka-item p{color:var(--body);font-size:14px;margin:0;line-height:1.5}
@media(max-width:720px){.ka{padding:30px 24px}.ka-grid{grid-template-columns:1fr}}

/* ---------- case cards ---------- */
.cards{display:grid;grid-template-columns:1fr;gap:26px}
.cs-card{display:grid;grid-template-columns:1.05fr 1fr;background:#ffffff;border:1px solid rgba(20,30,45,.08);border-radius:20px;overflow:hidden;box-shadow:0 10px 30px rgba(8,18,32,.20);transition:transform .3s ease,box-shadow .3s ease}
.cs-card:hover{transform:translateY(-4px);box-shadow:0 20px 48px rgba(8,18,32,.30)}
.cs-card .media{background:#ffffff;position:relative;overflow:hidden;min-height:290px}
.cs-card .media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:left top;transition:transform .4s}
.cs-card:hover .media img{transform:scale(1.04)}
.cs-card .body{padding:40px;display:flex;flex-direction:column;justify-content:center}
.cs-card .num-tag{font-size:12px;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--green);margin-bottom:14px}
.cs-card h3{font-size:25px;text-transform:uppercase;margin-bottom:12px;font-weight:700;letter-spacing:.01em;color:var(--green)}
.cs-card p{font-size:14.5px;margin-bottom:18px;color:#52677c}
.cs-card .mini{display:flex;gap:24px;margin-bottom:22px;flex-wrap:wrap}
.cs-card .mini div{font-size:12px;color:#6b7f92;text-transform:uppercase;letter-spacing:.04em}
.cs-card .mini b{display:block;font-size:20px;color:#28425A;font-weight:600;margin-bottom:2px}
.cs-card .go{font-size:13px;font-weight:700;color:var(--green);text-transform:uppercase;letter-spacing:.08em;display:inline-flex;gap:8px;align-items:center}
.cs-card:hover .go .arw{transform:translateX(5px)}
.cs-card .go .arw{transition:transform .2s}
.cs-card.flip .media{order:2}.cs-card.flip .body{order:1}
@media(max-width:760px){.cs-card,.cs-card.flip{grid-template-columns:1fr}.cs-card .media,.cs-card.flip .media{order:0;min-height:220px}.cs-card .body,.cs-card.flip .body{order:0;padding:30px 26px}}

/* ---------- footer (matches original) ---------- */
.foot-next{border-top:1px solid var(--line);background:var(--bg-2)}
.foot-next-inner{max-width:var(--maxw);margin:0 auto;padding:56px 24px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap}
.foot-next .lbl{font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--green);margin-bottom:10px}
.foot-next .nxt{font-size:26px;text-transform:uppercase;font-weight:500;color:var(--white)}
.foot-next .nxt:hover{color:var(--green)}
.site-foot{background:var(--bg);border-top:1px solid var(--line);padding:30px 0}
.site-foot-inner{max-width:var(--maxw);margin:0 auto;padding:0 24px;display:flex;justify-content:space-between;align-items:center;gap:20px;flex-wrap:wrap}
.site-foot p{margin:0;color:var(--white);font-size:14px}
.site-foot p a{color:var(--white)}
.site-foot p a:hover{color:var(--green)}
.socials{display:flex;gap:8px;list-style:none}
.socials a{display:grid;place-items:center;width:34px;height:34px;background:var(--dark);color:var(--white);font-size:14px}
.socials a:hover{background:var(--green);color:var(--white)}
@media(max-width:600px){.site-foot-inner{justify-content:center;text-align:center}}

/* fade-in */
.reveal{opacity:0;transform:translateY(14px);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}}