/* ============================================================
   RUBEN CURBELO — PORTFOLIO
   Editorial system: Instrument Serif + Geist + Geist Mono
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Instrument+Serif:ital@0;1&family=Geist:wght@300;400;500;600&family=Geist+Mono:wght@400;500&display=swap');

:root {
  /* Colors */
  --paper: #F4F1EC;
  --paper-2: #ECE8E1;
  --paper-3: #E0DBD2;
  --ink: #0E0E0C;
  --ink-2: #2A2A26;
  --ink-3: #6B6862;
  --ink-4: #A8A49C;
  --rule: #D4CFC5;
  --accent: #C24D2C;
  --accent-deep: #9A3D22;
  --sage: #7A8471;

  /* Type */
  --serif: 'Instrument Serif', 'Times New Roman', serif;
  --sans: 'Geist', -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: 'Geist Mono', ui-monospace, monospace;

  /* Spacing */
  --gutter: clamp(20px, 4vw, 56px);
  --section: clamp(80px, 12vw, 180px);

  /* Motion */
  --ease: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  font-feature-settings: "ss01", "ss02", "cv11";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: clip;    /* like hidden, but no scroll container */
  overflow-y: visible;
}

a { color: inherit; text-decoration: none; }
button { font: inherit; background: none; border: none; cursor: pointer; color: inherit; }
img { max-width: 100%; display: block; }

::selection { background: var(--ink); color: var(--paper); }

/* ============================================================
   TYPOGRAPHY
   ============================================================ */

.serif { font-family: var(--serif); font-weight: 400; letter-spacing: -0.01em; }
.mono { font-family: var(--mono); font-weight: 400; letter-spacing: 0.02em; }
.italic { font-style: italic; }

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-3);
}

.h-display {
  font-family: var(--serif);
  font-size: clamp(56px, 11vw, 200px);
  line-height: 0.92;
  letter-spacing: -0.025em;
  font-weight: 400;
}

.h1 {
  font-family: var(--serif);
  font-size: clamp(44px, 7vw, 112px);
  line-height: 0.96;
  letter-spacing: -0.02em;
  font-weight: 400;
}

.h2 {
  font-family: var(--serif);
  font-size: clamp(32px, 4.5vw, 72px);
  line-height: 1.02;
  letter-spacing: -0.015em;
  font-weight: 400;
}

.h3 {
  font-family: var(--serif);
  font-size: clamp(24px, 2.6vw, 40px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  font-weight: 400;
}

.lede {
  font-family: var(--serif);
  font-size: clamp(22px, 2.4vw, 36px);
  line-height: 1.3;
  letter-spacing: -0.005em;
  font-weight: 400;
  color: var(--ink-2);
}

.body-l {
  font-size: clamp(16px, 1.2vw, 19px);
  line-height: 1.6;
  color: var(--ink-2);
}

.body {
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink-2);
}

.caption {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: var(--ink-3);
}

/* ============================================================
   LAYOUT
   ============================================================ */

.wrap {
  width: 100%;
  max-width: 1680px;
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.grid {
  display: grid;
  grid-template-columns: repeat(12, 1fr);
  gap: 24px;
}

@media (max-width: 768px) {
  .grid { gap: 16px; }
}

hr.rule {
  border: 0;
  height: 1px;
  background: var(--rule);
  margin: 0;
}

/* ============================================================
   NAV
   ============================================================ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 20px var(--gutter);
  display: flex;
  justify-content: space-between;
  align-items: center;
  mix-blend-mode: difference;
  color: #F4F1EC;
}

.nav-mark {
  font-family: var(--serif);
  font-size: 22px;
  text-transform: uppercase;
  font-style: normal;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 32px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.nav-links a {
  position: relative;
  transition: opacity 0.3s var(--ease);
}

.nav-links a:hover { opacity: 0.6; }

.nav-time {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: inherit;
  opacity: 0.85;
}

@media (max-width: 720px) {
  .nav-links { display: none; }
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  padding: 14px 22px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  font-family: var(--mono);
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  transition: all 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--ink);
  transform: translateY(101%);
  transition: transform 0.5s var(--ease);
  z-index: -1;
}

.btn:hover { color: var(--paper); border-color: var(--ink); }
.btn:hover::before { transform: translateY(0); }

.btn-arrow {
  width: 8px; height: 8px;
  border-top: 1px solid currentColor;
  border-right: 1px solid currentColor;
  transform: rotate(45deg);
  transition: transform 0.3s var(--ease);
}

.btn:hover .btn-arrow { transform: rotate(45deg) translate(2px, -2px); }

/* ============================================================
   REVEAL ANIMATIONS
   ============================================================ */

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 1s var(--ease-out), transform 1s var(--ease-out);
}

.reveal.in {
  opacity: 1;
  transform: translateY(0);
}

.reveal-line {
  overflow: hidden;
  display: inline-block;
  /* Tight display line-heights (e.g. .hero-title / .cs-title) clip descenders
     of p/g and italic tails. Pad the mask downward so glyphs sit inside the
     (un-clipped) padding box, then cancel the layout impact with an equal
     negative margin so line spacing/rhythm is unchanged. Applies to every
     split title across the site, including future case studies. */
  padding-bottom: 0.22em;
  margin-bottom: -0.22em;
}

.reveal-line > span {
  display: inline-block;
  /* 130% (was 110%) keeps the word fully below the now-taller mask in the
     start state, so it still slides up from hidden. */
  transform: translateY(130%);
  transition: transform 1.1s var(--ease-out);
}

.reveal-line.in > span {
  transform: translateY(0);
}

.reveal-img {
  overflow: hidden;
  position: relative;
}

.reveal-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--paper-3);
  transform: scaleY(1);
  transform-origin: top;
  transition: transform 1.2s var(--ease-out);
}

.reveal-img.in::after { transform: scaleY(0); }

.reveal-img > * {
  transform: scale(1.1);
  transition: transform 1.6s var(--ease-out);
}

.reveal-img.in > * { transform: scale(1); }

/* ============================================================
   PLACEHOLDERS (CSS-drawn UI mockups)
   ============================================================ */

.placeholder {
  position: relative;
  width: 100%;
  background: var(--paper-2);
  overflow: hidden;
  border-radius: 2px;
}

.placeholder.tone-warm { background: linear-gradient(135deg, #E8DDD0, #D4C2A8); }
.placeholder.tone-cool { background: linear-gradient(135deg, #C9D2D6, #A8B4BC); }
.placeholder.tone-deep { background: linear-gradient(135deg, #1F2326, #0E0E0C); color: var(--paper); }
.placeholder.tone-accent { background: linear-gradient(135deg, #C24D2C, #8B3618); color: var(--paper); }
.placeholder.tone-sage { background: linear-gradient(135deg, #8A9481, #5E685A); color: var(--paper); }
.placeholder.tone-paper { background: var(--paper-2); }

.placeholder-label {
  position: absolute;
  top: 16px; left: 16px;
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  opacity: 0.6;
  z-index: 2;
}

.placeholder-meta {
  position: absolute;
  bottom: 16px; right: 16px;
  font-family: var(--mono);
  font-size: 10px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  opacity: 0.6;
  z-index: 2;
}

/* Subtle noise texture overlay for depth */
.placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.4'/%3E%3C/svg%3E");
  opacity: 0.06;
  pointer-events: none;
  mix-blend-mode: multiply;
}

/* ============================================================
   FOOTER
   ============================================================ */

.footer {
  background: var(--ink);
  color: var(--paper);
  padding: var(--section) var(--gutter) 32px;
  margin-top: var(--section);
}

.footer-mark {
  font-family: var(--serif);
  font-size: clamp(80px, 18vw, 280px);
  line-height: 0.85;
  letter-spacing: -0.04em;
  margin-bottom: 80px;
}

.footer-mark em { color: var(--accent); }

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 24px;
  padding-top: 32px;
  border-top: 1px solid rgba(244, 241, 236, 0.15);
  font-family: var(--mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-4);
}

.footer-links {
  display: flex;
  gap: 28px;
}

.footer-links a:hover { color: var(--paper); }

.reach-link {
  color: var(--ink-4);
  transition: color 0.3s var(--ease);
}

.reach-link:hover { color: var(--paper); }

.footer-reach {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  margin-bottom: 80px;
}

@media (max-width: 768px) {
  .footer-reach { grid-template-columns: 1fr; gap: 32px; }
  .footer-links { flex-wrap: wrap; gap: 14px 20px; }
}

/* Mobile: keep case-study section titles off the screen edge */
@media (max-width: 820px) {
  .cs-section-title { padding-left: 24px; }
}