/* ============================================================
   DAYAN ROMERO PORTFOLIO — SHARED STYLES
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@700;800&family=Inter:wght@300;400;500;600&display=swap');

/* ── Variables ─────────────────────────────────────────────── */
:root {
  --dark:         #0C0C0F;
  --dark-2:       #151519;
  --dark-card:    #1C1C22;
  --dark-border:  rgba(255,255,255,0.07);
  --light:        #F4F3EF;
  --light-2:      #ECEAE3;
  --white:        #FFFFFF;
  --black:        #080809;

  --accent:       #1AAFA3;
  --accent-dim:   rgba(26,175,163,0.12);
  --accent-hover: #14928B;

  --purple:       #7B5CF0;
  --red:          #C8102E;

  --text-muted-dark:  rgba(255,255,255,0.45);
  --text-muted-light: rgba(8,8,9,0.45);

  --nav-h:     72px;
  --max-w:     1200px;
  --pad-x:     clamp(24px, 5vw, 80px);
  --sec-py:    clamp(80px, 10vw, 140px);

  --ease:      cubic-bezier(0.22, 1, 0.36, 1);
  --trans:     0.35s var(--ease);
}

/* ── Reset ─────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'Inter', sans-serif;
  background: var(--light);
  color: var(--black);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a   { text-decoration: none; color: inherit; }
ul  { list-style: none; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }

/* ── Typography ────────────────────────────────────────────── */
.syne { font-family: 'Plus Jakarta Sans', sans-serif; }

.display-xl {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 800;
  font-size: clamp(52px, 9vw, 120px);
  line-height: 0.95;
  letter-spacing: -0.03em;
}
.display-lg {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 800;
  font-size: clamp(36px, 5vw, 64px);
  line-height: 1.05;
  letter-spacing: -0.025em;
}
.display-md {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: clamp(24px, 3vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.body-lg  { font-size: clamp(17px, 2vw, 20px); line-height: 1.65; font-weight: 400; }
.body-md  { font-size: 16px; line-height: 1.65; font-weight: 400; }
.body-sm  { font-size: 14px; line-height: 1.6;  font-weight: 400; }
.label    { font-size: 11px; letter-spacing: 0.14em; text-transform: uppercase; font-weight: 600; }

/* ── Layout utilities ──────────────────────────────────────── */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--pad-x);
}
.section { padding: var(--sec-py) var(--pad-x); }
.section--dark  { background: var(--dark); color: var(--white); }
.section--dark2 { background: var(--dark-2); color: var(--white); }
.section--light { background: var(--light); color: var(--black); }
.section--light2{ background: var(--light-2); color: var(--black); }

.section-header { margin-bottom: clamp(48px, 6vw, 80px); }
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--accent);
  margin-bottom: 16px;
}
.section-label::before {
  content: '';
  display: block;
  width: 28px;
  height: 2px;
  background: currentColor;
  border-radius: 2px;
}

/* ── Navigation ────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding: 0 var(--pad-x);
  transition: background var(--trans), backdrop-filter var(--trans), border-color var(--trans);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: rgba(12,12,15,0.85);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  border-color: var(--dark-border);
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
}
.nav__logo {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 800;
  font-size: 20px;
  color: var(--white);
  letter-spacing: -0.02em;
}
.nav__logo span { color: var(--accent); }
.nav__links {
  display: flex;
  align-items: center;
  gap: 36px;
}
.nav__links a {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: rgba(255,255,255,0.65);
  transition: color var(--trans);
}
.nav__links a:hover { color: var(--white); }
.nav__cta {
  font-size: 13px;
  font-weight: 600;
  padding: 10px 22px;
  border-radius: 100px;
  background: var(--accent);
  color: var(--white);
  letter-spacing: 0.04em;
  transition: background var(--trans), transform var(--trans);
}
.nav__cta:hover { background: var(--accent-hover); transform: translateY(-1px); }

/* Mobile nav toggle */
.nav__burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}
.nav__burger span {
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--trans);
}

/* ── Buttons ───────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  border-radius: 100px;
  padding: 14px 28px;
  transition: all var(--trans);
}
.btn--primary {
  background: var(--accent);
  color: var(--white);
}
.btn--primary:hover { background: var(--accent-hover); transform: translateY(-2px); box-shadow: 0 8px 24px rgba(26,175,163,0.35); }

.btn--outline-light {
  border: 1.5px solid rgba(255,255,255,0.25);
  color: var(--white);
}
.btn--outline-light:hover { border-color: rgba(255,255,255,0.6); background: rgba(255,255,255,0.07); transform: translateY(-2px); }

.btn--outline-dark {
  border: 1.5px solid rgba(8,8,9,0.2);
  color: var(--black);
}
.btn--outline-dark:hover { border-color: var(--black); background: var(--black); color: var(--white); transform: translateY(-2px); }

.btn svg { width: 16px; height: 16px; }

/* ── Footer ────────────────────────────────────────────────── */
.footer {
  background: var(--dark);
  color: var(--white);
  padding: 40px var(--pad-x);
  border-top: 1px solid var(--dark-border);
}
.footer__inner {
  max-width: var(--max-w);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer__copy { color: var(--text-muted-dark); font-size: 13px; }
.footer__links { display: flex; gap: 28px; }
.footer__links a { font-size: 13px; color: var(--text-muted-dark); transition: color var(--trans); }
.footer__links a:hover { color: var(--accent); }

/* ── Scroll reveal ─────────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Case study nav ────────────────────────────────────────── */
.cs-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding: 0 var(--pad-x);
  background: rgba(12,12,15,0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--dark-border);
}
.cs-nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
}
.cs-nav__back {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.65);
  font-size: 13px;
  font-weight: 500;
  transition: color var(--trans);
}
.cs-nav__back:hover { color: var(--white); }
.cs-nav__back svg { width: 16px; height: 16px; }
.cs-nav__title { font-size: 13px; font-weight: 600; color: var(--text-muted-dark); letter-spacing: 0.04em; }
.cs-nav__next {
  display: flex;
  align-items: center;
  gap: 10px;
  color: rgba(255,255,255,0.65);
  font-size: 13px;
  font-weight: 500;
  transition: color var(--trans);
}
.cs-nav__next:hover { color: var(--white); }
.cs-nav__next svg { width: 16px; height: 16px; }

/* ── Case study hero ───────────────────────────────────────── */
.cs-hero {
  min-height: 75vh;
  display: flex;
  align-items: flex-end;
  padding: calc(var(--nav-h) + 60px) var(--pad-x) 80px;
  position: relative;
  overflow: hidden;
}
.cs-hero__content {
  position: relative;
  z-index: 2;
  max-width: var(--max-w);
  margin: 0 auto;
  width: 100%;
}
.cs-hero__case-num { color: rgba(255,255,255,0.4); margin-bottom: 20px; }
.cs-hero__title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 800;
  font-size: clamp(40px, 6vw, 80px);
  line-height: 1.0;
  letter-spacing: -0.03em;
  color: var(--white);
  max-width: 900px;
  margin-bottom: 32px;
}
.cs-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
}
.cs-hero__meta-item label {
  display: block;
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-weight: 600;
  color: rgba(255,255,255,0.4);
  margin-bottom: 6px;
}
.cs-hero__meta-item p {
  font-size: 15px;
  color: rgba(255,255,255,0.85);
  font-weight: 500;
}

/* ── Case study content ────────────────────────────────────── */
.cs-section { padding: clamp(60px, 8vw, 100px) var(--pad-x); }
.cs-section__inner {
  max-width: var(--max-w);
  margin: 0 auto;
}
.cs-grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 5vw, 80px);
  align-items: start;
}
.cs-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.cs-label {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 20px;
  display: block;
}
.cs-h2 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 800;
  font-size: clamp(28px, 4vw, 48px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}
.cs-h3 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-weight: 700;
  font-size: clamp(18px, 2.5vw, 26px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 14px;
}
.cs-body { font-size: 16px; line-height: 1.75; color: rgba(8,8,9,0.75); max-width: 680px; }
.cs-body--white { color: rgba(255,255,255,0.75); }
.cs-body + .cs-body { margin-top: 16px; }

.cs-list { margin-top: 16px; }
.cs-list li {
  font-size: 16px;
  line-height: 1.65;
  color: rgba(8,8,9,0.75);
  padding-left: 20px;
  position: relative;
  margin-bottom: 10px;
}
.cs-list li::before {
  content: '→';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 13px;
}
.cs-list--white li { color: rgba(255,255,255,0.75); }

.cs-img-frame {
  border-radius: 16px;
  overflow: hidden;
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 280px;
}
.cs-img-placeholder {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 48px;
  text-align: center;
  gap: 12px;
  color: rgba(255,255,255,0.25);
}
.cs-img-placeholder svg { width: 48px; height: 48px; opacity: 0.4; }
.cs-img-placeholder span { font-size: 13px; }

.cs-stat-card {
  padding: 32px;
  border-radius: 16px;
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
}
.cs-stat-card__num {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 48px;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  line-height: 1;
  margin-bottom: 8px;
}
.cs-stat-card__label { font-size: 14px; color: rgba(255,255,255,0.55); }

.cs-tag {
  display: inline-flex;
  padding: 6px 14px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  background: var(--accent-dim);
  color: var(--accent);
  border: 1px solid rgba(26,175,163,0.2);
}
.cs-tag--light {
  background: rgba(8,8,9,0.06);
  color: rgba(8,8,9,0.6);
  border-color: rgba(8,8,9,0.1);
}

.cs-divider {
  height: 1px;
  background: var(--dark-border);
  margin: 0;
}
.cs-divider--light {
  background: rgba(8,8,9,0.08);
}

/* ── Insight cards ─────────────────────────────────────────── */
.insight-card {
  padding: 28px;
  border-radius: 14px;
  background: var(--dark-card);
  border: 1px solid var(--dark-border);
}
.insight-card h4 {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
  margin-bottom: 10px;
}
.insight-card p { font-size: 14px; color: rgba(255,255,255,0.55); line-height: 1.6; }

/* ── Responsive ────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: var(--nav-h); left: 0; right: 0;
    background: var(--dark);
    padding: 32px var(--pad-x);
    gap: 28px;
    border-bottom: 1px solid var(--dark-border);
  }
  .nav__links a { font-size: 18px; }
  .nav__cta { display: none; }
  .nav__burger { display: flex; }

  .cs-grid-2 { grid-template-columns: 1fr; }
  .cs-grid-3 { grid-template-columns: 1fr; }
  .cs-hero__meta { gap: 24px; }
}