/* ═══════════════════════════════════════════════════════
   SHARED STYLES — Rodion Case Study Pages
   Usage: link from all hero-premium/case-studies/*.html
   Asset paths in HTML are relative to case-studies/ folder
   ═══════════════════════════════════════════════════════ */

/* RESET & TOKENS */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg:      #050505;
  --bg-2:    #0A0A0C;
  --bg-3:    #0F0F13;
  --ac:      #0F62FE;
  --ac2:     #45C7FF;
  --t1: rgba(255,255,255,0.92);
  --t2: rgba(255,255,255,0.60);
  --t3: rgba(255,255,255,0.30);
  --t4: rgba(255,255,255,0.08);
  --border:  rgba(255,255,255,0.07);
  --bh:      rgba(255,255,255,0.14);
  --glass:   rgba(5,5,5,0.76);
  --f: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --ease: cubic-bezier(0.16,1,0.3,1);
}

html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  font-family: var(--f);
  color: var(--t1);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
a  { text-decoration: none; color: inherit; }
img { display: block; max-width: 100%; }

/* SCROLL REVEAL */
[data-r] {
  opacity: 0; transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s var(--ease);
}
[data-r].in  { opacity: 1; transform: none; }
[data-r][data-d="1"] { transition-delay: 0.08s; }
[data-r][data-d="2"] { transition-delay: 0.16s; }
[data-r][data-d="3"] { transition-delay: 0.24s; }
[data-r][data-d="4"] { transition-delay: 0.32s; }

/* SHARED UTILITIES */
.wrap { max-width: 1160px; margin: 0 auto; padding: 0 56px; }
.eyebrow {
  display: inline-block;
  font-size: 0.60rem; font-weight: 700;
  letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--ac2); margin-bottom: 16px;
}
.sh {
  font-size: clamp(2rem, 3.8vw, 3.2rem); font-weight: 800;
  line-height: 1.04; letter-spacing: -0.035em; color: var(--t1);
}
.sp {
  font-size: clamp(0.88rem, 1.1vw, 1rem); font-weight: 300;
  line-height: 1.72; color: var(--t2); margin-top: 14px;
}
.btn-p {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.80rem; font-weight: 700; letter-spacing: 0.03em;
  color: #000; background: #fff; padding: 14px 28px; border-radius: 100px;
  transition: transform 0.22s ease, background 0.22s ease;
}
.btn-p:hover { transform: scale(1.03); background: rgba(255,255,255,0.86); }
.btn-g {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.80rem; font-weight: 500; letter-spacing: 0.03em;
  color: var(--t1); background: transparent;
  border: 1px solid rgba(255,255,255,0.18); padding: 14px 28px; border-radius: 100px;
  transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}
.btn-g:hover { transform: scale(1.03); border-color: rgba(255,255,255,0.40); background: rgba(255,255,255,0.05); }
.btns { display: flex; gap: 12px; flex-wrap: wrap; }

/* NAV */
#nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  height: 64px; display: flex; align-items: center; justify-content: space-between;
  padding: 0 56px;
  background: var(--glass);
  backdrop-filter: blur(28px) saturate(1.6);
  -webkit-backdrop-filter: blur(28px) saturate(1.6);
  border-bottom: 1px solid rgba(255,255,255,0.055);
}
.n-brand { font-size: 0.86rem; font-weight: 800; letter-spacing: 0.02em; }
.n-brand em { font-style: normal; color: var(--ac2); }
.n-links { display: flex; list-style: none; gap: 32px; }
.n-links a { font-size: 0.75rem; font-weight: 500; color: var(--t2); transition: color 0.2s ease; }
.n-links a:hover { color: var(--t1); }
.n-cta {
  font-size: 0.75rem; font-weight: 600; color: var(--t1);
  padding: 8px 20px; border: 1px solid rgba(255,255,255,0.16); border-radius: 100px;
  transition: background 0.22s ease, border-color 0.22s ease;
}
.n-cta:hover { background: rgba(255,255,255,0.07); border-color: rgba(255,255,255,0.34); }
.n-ham {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: 1px solid rgba(255,255,255,0.12);
  border-radius: 8px; padding: 8px 9px; cursor: pointer;
}
.n-ham span {
  display: block; width: 20px; height: 1.5px;
  background: var(--t1); border-radius: 1px;
  transition: transform 0.3s ease, opacity 0.3s ease;
}
.n-ham.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.n-ham.open span:nth-child(2) { opacity: 0; }
.n-ham.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

#drawer {
  position: fixed; top: 64px; left: 0; right: 0; z-index: 899;
  background: rgba(5,5,5,0.97); backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border);
  padding: 8px 28px 28px;
  transform: translateY(-110%); opacity: 0;
  transition: transform 0.4s var(--ease), opacity 0.35s ease;
  pointer-events: none;
}
#drawer.open { transform: none; opacity: 1; pointer-events: auto; }
.d-links { list-style: none; }
.d-links li a {
  display: block; font-size: 1rem; font-weight: 500; color: var(--t2);
  padding: 15px 0; border-bottom: 1px solid rgba(255,255,255,0.055);
  transition: color 0.2s ease;
}
.d-links li a:hover { color: var(--t1); }
.d-cta {
  display: block; margin-top: 20px; text-align: center;
  font-size: 0.85rem; font-weight: 700; color: #000;
  background: #fff; padding: 15px; border-radius: 100px;
}

/* HERO */
.cs-hero {
  position: relative; min-height: 72vh; min-height: 72dvh;
  display: flex; align-items: flex-end; overflow: hidden;
  padding-bottom: 80px;
}
.cs-hero-bg {
  position: absolute; inset: 0;
  background-size: cover; background-position: center;
}
.cs-hero-ov {
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(5,5,5,0.97) 0%, rgba(5,5,5,0.65) 45%, rgba(5,5,5,0.25) 100%);
}
.cs-hero-c {
  position: relative; z-index: 2;
  max-width: 760px; padding: 0 56px;
}
.breadcrumb {
  display: flex; align-items: center; gap: 8px;
  font-size: 0.65rem; font-weight: 500; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--t3); margin-bottom: 20px;
}
.breadcrumb a { color: var(--t3); transition: color 0.2s ease; }
.breadcrumb a:hover { color: var(--t1); }
.breadcrumb-sep { color: var(--t3); }
.cs-hero-tag {
  display: inline-flex; align-items: center; gap: 7px;
  font-size: 0.60rem; font-weight: 700; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--ac2);
  border: 1px solid rgba(69,199,255,0.28);
  padding: 7px 16px; border-radius: 100px;
  background: rgba(69,199,255,0.07); margin-bottom: 22px;
}
.cs-hero-h1 {
  font-size: clamp(2.4rem, 5vw, 5rem); font-weight: 900;
  line-height: 0.97; letter-spacing: -0.04em; color: var(--t1);
  margin-bottom: 18px;
}
.cs-hero-h1 em { font-style: normal; color: var(--ac2); }
.cs-hero-p {
  font-size: clamp(0.90rem, 1.2vw, 1.05rem); font-weight: 300;
  line-height: 1.68; color: var(--t2); max-width: 560px;
}

/* STATS BAR */
.cs-stats {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.cs-stats-g {
  max-width: 1160px; margin: 0 auto; padding: 0 56px;
  display: grid; grid-template-columns: repeat(4, 1fr);
}
.cs-stat {
  padding: 36px 32px; text-align: center;
  border-right: 1px solid var(--border);
}
.cs-stat:last-child { border-right: none; }
.cs-stat-n {
  display: block;
  font-size: clamp(2rem, 3vw, 2.8rem); font-weight: 900;
  letter-spacing: -0.04em; line-height: 1;
  background: linear-gradient(90deg, var(--ac2), var(--ac));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text; margin-bottom: 7px;
}
.cs-stat-l { font-size: 0.72rem; font-weight: 500; letter-spacing: 0.04em; color: var(--t2); }

/* CHALLENGE / SOLUTION SECTIONS */
.cs-section { padding: 100px 0; }
.cs-section.alt { background: var(--bg-2); }
.cs-two-col {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 80px; align-items: center;
}
.cs-two-col.rev { direction: rtl; }
.cs-two-col.rev > * { direction: ltr; }
.cs-col-text h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); font-weight: 800; letter-spacing: -0.03em; color: var(--t1); line-height: 1.1; margin: 12px 0 18px; }
.cs-col-text p { font-size: 0.90rem; font-weight: 300; line-height: 1.74; color: var(--t2); margin-bottom: 16px; }
.cs-col-text p + p { margin-top: 0; }
.cs-col-img {
  border-radius: 14px; overflow: hidden;
  border: 1px solid var(--border);
  aspect-ratio: 4/3;
}
.cs-col-img img { width: 100%; height: 100%; object-fit: cover; }

/* TECH STACK */
.cs-tech { padding: 80px 0; background: var(--bg); }
.cs-tech-chips {
  display: flex; flex-wrap: wrap; gap: 10px; margin-top: 36px;
}
.chip {
  font-size: 0.72rem; font-weight: 500; letter-spacing: 0.04em;
  color: var(--t1); padding: 7px 16px;
  border: 1px solid var(--border); border-radius: 100px;
  background: rgba(255,255,255,0.03);
  transition: border-color 0.22s ease, background 0.22s ease;
}
.chip:hover { border-color: var(--bh); background: rgba(255,255,255,0.06); }
.chip.hi { border-color: rgba(69,199,255,0.28); color: var(--ac2); background: rgba(69,199,255,0.06); }

/* OUTCOMES */
.cs-outcomes { padding: 100px 0; background: var(--bg-2); }
.outcome-list { display: flex; flex-direction: column; gap: 0; margin-top: 56px; }
.outcome-item {
  display: grid; grid-template-columns: 80px 1fr;
  gap: 32px; align-items: start;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}
.outcome-item:first-child { border-top: 1px solid var(--border); }
.outcome-num {
  font-size: clamp(2.5rem, 3.5vw, 3.2rem); font-weight: 900;
  letter-spacing: -0.05em; line-height: 1;
  background: linear-gradient(90deg, var(--ac2), var(--ac));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.outcome-body h3 { font-size: 1.05rem; font-weight: 700; letter-spacing: -0.02em; color: var(--t1); margin-bottom: 6px; line-height: 1.3; }
.outcome-body p  { font-size: 0.84rem; font-weight: 300; line-height: 1.68; color: var(--t2); }

/* RELATED CASE STUDIES */
.cs-related { padding: 100px 0; background: var(--bg); }
.rel-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 56px; }
.rel-card {
  position: relative; border-radius: 14px; overflow: hidden;
  aspect-ratio: 16/9; border: 1px solid var(--border);
  display: block; background: var(--bg-2);
  transition: border-color 0.3s ease;
}
.rel-card:hover { border-color: var(--bh); }
.rel-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0.75; transition: transform 0.6s ease, opacity 0.4s ease; }
.rel-card:hover img { transform: scale(1.05); opacity: 1; }
.rel-card-ov { position: absolute; inset: 0; background: linear-gradient(to top, rgba(5,5,5,0.96) 0%, rgba(5,5,5,0.45) 55%, transparent 100%); }
.rel-card-body { position: absolute; bottom: 0; left: 0; right: 0; padding: 22px 24px; z-index: 2; }
.rel-tag { font-size: 0.56rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ac2); display: block; margin-bottom: 6px; }
.rel-title { font-size: 0.95rem; font-weight: 700; letter-spacing: -0.02em; color: var(--t1); line-height: 1.3; }
.rel-arrow { font-size: 0.70rem; font-weight: 600; color: var(--t3); margin-top: 10px; display: inline-block; transition: color 0.22s ease, transform 0.22s ease; }
.rel-card:hover .rel-arrow { color: var(--ac2); transform: translateX(4px); }

/* CTA STRIP */
.cs-cta {
  padding: 120px 0; background: var(--bg-2);
  border-top: 1px solid var(--border); text-align: center;
}
.cs-cta .wrap { display: flex; flex-direction: column; align-items: center; gap: 18px; }
.cs-cta-h { font-size: clamp(2.2rem, 4vw, 3.8rem); font-weight: 900; letter-spacing: -0.04em; line-height: 1.02; color: var(--t1); max-width: 600px; }
.cs-cta-sub { font-size: clamp(0.88rem, 1.1vw, 1rem); font-weight: 300; color: var(--t2); max-width: 420px; line-height: 1.70; }
.foot { font-size: 0.64rem; letter-spacing: 0.10em; color: var(--t3); margin-top: 56px; }

/* ALL PROJECTS PAGE */
.ap-hero {
  padding: 160px 0 80px;
  background: var(--bg-2);
  border-bottom: 1px solid var(--border);
}
.ap-filter {
  display: flex; gap: 8px; flex-wrap: wrap;
  margin-top: 48px;
}
.ap-filter-btn {
  font-size: 0.68rem; font-weight: 600; letter-spacing: 0.06em;
  text-transform: uppercase; color: var(--t2);
  padding: 7px 18px; border: 1px solid var(--border); border-radius: 100px;
  background: transparent; cursor: pointer;
  transition: border-color 0.22s ease, color 0.22s ease, background 0.22s ease;
}
.ap-filter-btn:hover,
.ap-filter-btn.active {
  border-color: var(--ac2); color: var(--ac2); background: rgba(69,199,255,0.06);
}
.ap-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
.ap-card {
  position: relative; border-radius: 14px; overflow: hidden;
  aspect-ratio: 3/2; border: 1px solid var(--border);
  display: block; background: var(--bg-3);
  transition: border-color 0.3s ease;
}
.ap-card:hover { border-color: var(--bh); }
.ap-card img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; opacity: 0.75; transition: transform 0.6s ease, opacity 0.4s ease; }
.ap-card:hover img { transform: scale(1.06); opacity: 1; }
.ap-card-ov { position: absolute; inset: 0; background: linear-gradient(to top, rgba(5,5,5,0.98) 0%, rgba(5,5,5,0.65) 40%, rgba(5,5,5,0.15) 100%); }
.ap-card-body { position: absolute; bottom: 0; left: 0; right: 0; padding: 22px 24px; z-index: 2; }
.ap-tag { font-size: 0.56rem; font-weight: 700; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ac2); display: block; margin-bottom: 6px; }
.ap-title { font-size: 0.98rem; font-weight: 700; letter-spacing: -0.02em; color: var(--t1); line-height: 1.28; }
.ap-arrow { font-size: 0.68rem; font-weight: 600; color: rgba(255,255,255,0.35); margin-top: 9px; display: inline-block; opacity: 0; transition: opacity 0.3s ease, color 0.22s ease, transform 0.22s ease; }
.ap-card:hover .ap-arrow { opacity: 1; color: var(--ac2); transform: translateX(4px); }

/* RESPONSIVE */
@media (max-width: 900px) {
  .wrap { padding: 0 32px; }
  .cs-hero-c { padding: 0 32px; }
  .cs-stats-g { padding: 0 32px; grid-template-columns: repeat(2, 1fr); }
  .cs-stat:nth-child(2) { border-right: none; }
  .cs-stat:nth-child(3) { border-top: 1px solid var(--border); }
  .cs-two-col { grid-template-columns: 1fr; gap: 40px; }
  .cs-two-col.rev { direction: ltr; }
  .cs-section { padding: 72px 0; }
  .rel-grid { grid-template-columns: 1fr; }
  .ap-grid { grid-template-columns: repeat(2, 1fr); }
  #nav { padding: 0 24px; }
  .n-links, .n-cta { display: none; }
  .n-ham { display: flex; }
}
@media (max-width: 600px) {
  .cs-hero { min-height: 60vh; padding-bottom: 60px; }
  .cs-hero-h1 { font-size: clamp(2rem, 9vw, 3.2rem); }
  .cs-stats-g { grid-template-columns: repeat(2, 1fr); padding: 0 20px; }
  .cs-stat { padding: 24px 16px; }
  .outcome-item { grid-template-columns: 60px 1fr; gap: 20px; }
  .btns { flex-direction: column; align-items: stretch; }
  .btn-p, .btn-g { text-align: center; justify-content: center; }
  .ap-grid { grid-template-columns: 1fr; }
  .wrap { padding: 0 20px; }
}
@media (min-width: 901px) { #drawer { display: none !important; } }


/* ═══════════════════════════════════════════════════════
   METADATA STRIP  (below hero)
═══════════════════════════════════════════════════════ */
.cs-meta {
  background: var(--bg-3);
  border-bottom: 1px solid var(--border);
}
.cs-meta-row {
  max-width: 1160px; margin: 0 auto; padding: 0 56px;
  display: grid; grid-template-columns: repeat(5, 1fr);
}
.cs-meta-item {
  padding: 22px 20px;
  border-right: 1px solid var(--border);
  display: flex; flex-direction: column; gap: 5px;
}
.cs-meta-item:last-child { border-right: none; }
.cs-meta-label {
  font-size: 0.55rem; font-weight: 700; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--t3);
}
.cs-meta-val {
  font-size: 0.80rem; font-weight: 600; color: var(--t1); line-height: 1.3;
}
@media (max-width: 900px) {
  .cs-meta-row { grid-template-columns: repeat(2,1fr); padding:0 32px; }
  .cs-meta-item { border-right:none; border-bottom:1px solid var(--border); }
  .cs-meta-item:last-child { border-bottom:none; }
}
@media (max-width: 480px) {
  .cs-meta-row { grid-template-columns: 1fr; }
}

/* ═══════════════════════════════════════════════════════
   EXECUTIVE SUMMARY  (below metadata)
═══════════════════════════════════════════════════════ */
.cs-exec {
  padding: 88px 0;
  border-bottom: 1px solid var(--border);
}
.cs-exec-grid {
  display: grid; grid-template-columns: 260px 1fr;
  gap: 80px; align-items: start;
}
.cs-exec-label {
  font-size: 0.58rem; font-weight: 700; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--ac2);
  display: block; margin-bottom: 16px;
}
.cs-exec-title {
  font-size: clamp(1.3rem, 2vw, 1.7rem); font-weight: 800;
  letter-spacing: -0.03em; color: var(--t1); line-height: 1.14;
}
.cs-exec-lead {
  font-size: clamp(1rem, 1.3vw, 1.12rem); font-weight: 400;
  line-height: 1.76; color: var(--t1); margin-bottom: 20px;
}
.cs-exec-lead strong { font-weight: 700; }
.cs-exec-body p {
  font-size: 0.90rem; font-weight: 300; line-height: 1.80;
  color: var(--t2); margin-bottom: 16px;
}
.cs-exec-body p:last-child { margin-bottom: 0; }
.cs-exec-body strong { font-weight: 600; color: var(--t1); }
@media (max-width: 900px) {
  .cs-exec-grid { grid-template-columns: 1fr; gap: 28px; }
  .cs-exec { padding: 64px 0; }
}

/* Hero refinement — cleaner, less heavy */
.cs-hero { min-height: 62vh; min-height: 62dvh; align-items: center; padding-top: 64px; padding-bottom: 0; }
.cs-hero-ov {
  background: linear-gradient(
    170deg,
    rgba(5,5,5,0.50) 0%,
    rgba(5,5,5,0.55) 40%,
    rgba(5,5,5,0.88) 75%,
    rgba(5,5,5,0.98) 100%
  );
}