/* ==========================================================================
   PAPER PLANE WEB CO. — DESIGN TOKENS
   A fluid, vw-anchored token system inspired by editorial motion-design
   studio sites: confident type, asymmetric grid, restrained palette.
   ========================================================================== */

:root{

  /* ---------- COLOR: "Folded Paper" palette ---------- */
  --ink:        #0B0C0E;   /* near-black, warm undertone */
  --ink-soft:   #1A1C20;
  --paper:      #FAF9F6;   /* warm paper white */
  --paper-dim:  #F1EFEA;   /* card / surface tint */
  --line:       #E4E1DA;   /* hairline borders on paper */
  --line-dark:  #2B2D32;   /* hairline borders on ink */
  --mute:       #84878C;   /* secondary text on paper */
  --mute-dark:  #8D9099;   /* secondary text on ink */
  --flight:     #3D6FFF;   /* signature accent blue */
  --flight-dim: #2A4FC4;
  --flight-tint:#E9EEFF;
  --sun:        #FFB648;   /* rare warm accent — used once per page max */

  --bg:        var(--paper);
  --bg-raised: var(--paper-dim);
  --fg:        var(--ink);
  --fg-mute:   var(--mute);
  --border:    var(--line);

  /* ---------- TYPE FAMILIES ---------- */
  --f-display: 'Fraunces', 'Iowan Old Style', Georgia, serif;
  --f-body:    'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --f-mono:    'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* ---------- FLUID TYPE SCALE (vw with clamp safety) ---------- */
  --fs-display-xl: clamp(2.8rem, 1.2rem + 8vw, 9.5rem);
  --fs-display-l:  clamp(2.4rem, 1rem + 6vw, 6.4rem);
  --fs-display-m:  clamp(2rem, 1rem + 4vw, 4.2rem);
  --fs-h1:         clamp(1.9rem, 0.9rem + 3vw, 3.2rem);
  --fs-h2:         clamp(1.5rem, 0.8rem + 2vw, 2.2rem);
  --fs-h3:         clamp(1.2rem, 0.6rem + 1.2vw, 1.6rem);
  --fs-body-l:     clamp(1.05rem, 0.9rem + 0.4vw, 1.3rem);
  --fs-body:       clamp(0.95rem, 0.85rem + 0.2vw, 1.05rem);
  --fs-small:      clamp(0.78rem, 0.7rem + 0.15vw, 0.88rem);
  --fs-micro:      clamp(0.68rem, 0.62rem + 0.1vw, 0.74rem);

  /* ---------- SPACING — base unit scaled fluidly ---------- */
  --unit: clamp(1rem, 0.6rem + 0.7vw, 1.6rem);
  --sp-1: calc(var(--unit) * 0.25);
  --sp-2: calc(var(--unit) * 0.5);
  --sp-3: calc(var(--unit) * 0.75);
  --sp-4: var(--unit);
  --sp-5: calc(var(--unit) * 1.5);
  --sp-6: calc(var(--unit) * 2.25);
  --sp-7: calc(var(--unit) * 3.5);
  --sp-8: calc(var(--unit) * 5.5);
  --sp-9: calc(var(--unit) * 8.5);

  /* edge gutter — the constant margin from the reference's 1.05vw rhythm */
  --gutter: clamp(1.25rem, 0.9rem + 1.6vw, 2.6rem);

  /* ---------- MOTION ---------- */
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-io-soft:  cubic-bezier(0.45, 0, 0.55, 1);
  --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 0.3s;
  --dur-mid:  0.6s;
  --dur-slow: 1.1s;

  /* ---------- RADIUS / BORDERS ---------- */
  --r-sm: 6px;
  --r-md: 12px;
  --r-lg: 22px;
  --r-pill: 999px;
  --hair: 1px;

  /* ---------- Z ---------- */
  --z-cursor: 9990;
  --z-nav: 900;
  --z-panel: 950;
  --z-loader: 999;
}

[data-theme="dark"]{
  --bg: var(--ink);
  --bg-raised: var(--ink-soft);
  --fg: var(--paper);
  --fg-mute: var(--mute-dark);
  --border: var(--line-dark);
}

/* ==========================================================================
   RESET
   ========================================================================== */
*, *::before, *::after{ box-sizing: border-box; }
html{
  -webkit-text-size-adjust: none;
  text-size-adjust: none;
  scroll-behavior: auto;
}
body, h1, h2, h3, h4, p, figure, blockquote, ul, ol, dl, dd{ margin: 0; }
ul, ol{ list-style: none; padding: 0; }
img, picture, svg, video{ display: block; max-width: 100%; }
a{ color: inherit; text-decoration: none; }
button, input, select, textarea{
  font: inherit; color: inherit; background: none; border: 0; outline: 0;
}
button{ cursor: pointer; }
::selection{ background: var(--ink); color: var(--paper); }

html, body{
  background: var(--bg);
  color: var(--fg);
  font-family: var(--f-body);
  font-weight: 500;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  font-optical-sizing: auto;
  letter-spacing: -0.01em;
}

body.no-scroll{ overflow: hidden; height: 100vh; }

/* ==========================================================================
   TYPE UTILITIES
   ========================================================================== */
.font-display{ font-family: var(--f-display); }
.font-mono{ font-family: var(--f-mono); }

.eyebrow{
  font-family: var(--f-mono);
  font-size: var(--fs-micro);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--fg-mute);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.eyebrow::before{
  content: '';
  display: inline-block;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--flight);
  flex-shrink: 0;
}

.display-xl{
  font-family: var(--f-display);
  font-size: var(--fs-display-xl);
  font-weight: 500;
  line-height: 0.96;
  letter-spacing: -0.01em;
}
.display-l{
  font-family: var(--f-display);
  font-size: var(--fs-display-l);
  font-weight: 500;
  line-height: 0.98;
  letter-spacing: -0.01em;
}
.display-m{
  font-family: var(--f-display);
  font-size: var(--fs-display-m);
  font-weight: 500;
  line-height: 1.02;
  letter-spacing: -0.008em;
}
h1, .h1{
  font-family: var(--f-display);
  font-size: var(--fs-h1);
  font-weight: 500;
  line-height: 1.06;
  letter-spacing: -0.01em;
}
h2, .h2{
  font-family: var(--f-display);
  font-size: var(--fs-h2);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.008em;
}
h3, .h3{
  font-family: var(--f-body);
  font-size: var(--fs-h3);
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
}
.body-l{ font-size: var(--fs-body-l); line-height: 1.55; font-weight: 500; }
p, .body{ font-size: var(--fs-body); line-height: 1.65; font-weight: 500; color: var(--fg); }
.small{ font-size: var(--fs-small); line-height: 1.5; }
.micro{ font-family: var(--f-mono); font-size: var(--fs-micro); letter-spacing: 0.08em; text-transform: uppercase; }
.mute{ color: var(--fg-mute); }
em{ font-style: italic; font-family: var(--f-display); color: var(--flight); }
strong, b{ font-weight: 600; }

.italic-serif{ font-family: var(--f-display); font-style: italic; font-weight: 400; }

/* ==========================================================================
   LAYOUT PRIMITIVES
   ========================================================================== */
.edge{ padding-left: var(--gutter); padding-right: var(--gutter); }
.wrap{ max-width: 1600px; margin: 0 auto; }
.section{ position: relative; padding-top: var(--sp-8); padding-bottom: var(--sp-8); }
.section--tight{ padding-top: var(--sp-6); padding-bottom: var(--sp-6); }
.section--surface{ background: var(--bg-raised); }

.rule{ height: var(--hair); width: 100%; background: var(--border); position: relative; overflow: hidden; }

.split{
  display: grid;
  gap: var(--sp-6);
}
@media (min-width: 900px){
  .split--60-40{ grid-template-columns: 1.5fr 1fr; }
  .split--40-60{ grid-template-columns: 1fr 1.5fr; }
  .split--64-36{ grid-template-columns: 1.78fr 1fr; }
  .split--even{ grid-template-columns: 1fr 1fr; }
}

.visually-hidden{
  position: absolute !important;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.skip-link{
  position: absolute; left: -9999px; top: 0;
  background: var(--ink); color: var(--paper);
  padding: 12px 18px; z-index: 9999;
  font-family: var(--f-mono); font-size: 13px;
}
.skip-link:focus{ left: var(--gutter); top: var(--gutter); }

:focus-visible{
  outline: 2px solid var(--flight);
  outline-offset: 3px;
  border-radius: 2px;
}

@media (prefers-reduced-motion: reduce){
  *, *::before, *::after{
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}
/* ── Google Sheets dynamic content ─────────────────────────── */
.sheets-skeleton{
  background: linear-gradient(90deg, var(--paper-dim) 25%, var(--line) 50%, var(--paper-dim) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.4s infinite;
  border-radius: var(--r-lg);
  min-height: 240px;
}
@keyframes shimmer{
  0%  { background-position: 200% 0; }
  100%{ background-position: -200% 0; }
}

/* Case study cards rendered by sheets.js */
.case-study{
  display: grid;
  gap: var(--sp-6);
  padding: var(--sp-7) 0;
  border-bottom: 1px solid var(--border);
  align-items: center;
}
@media(min-width:860px){
  .case-study{ grid-template-columns: 1fr 1fr; }
}
.case-study__visual{
  aspect-ratio: 4/3;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-raised);
  position: relative;
}
.case-screenshot{
  width: 100%; height: 100%;
  object-fit: cover; object-position: top;
  display: block;
}
.case-screenshot-fallback{
  position: absolute; inset: 0;
  display: flex; align-items: center; justify-content: center;
}
.case-study__industry{
  font-family: var(--f-mono);
  font-size: var(--fs-micro);
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--flight);
  margin-bottom: var(--sp-3);
}
.case-study__title{
  font-family: var(--f-display);
  font-size: clamp(1.8rem,1rem+3vw,3rem);
  font-weight: 500;
  letter-spacing: -.01em;
  margin-bottom: var(--sp-3);
}
.case-url{
  display: inline-flex; align-items: center; gap: .5em;
  font-family: var(--f-mono); font-size: var(--fs-small);
  color: var(--fg-mute);
  margin-bottom: var(--sp-4);
  transition: color .3s;
}
.case-url:hover{ color: var(--flight); }
.case-study__stat-num{
  font-family: var(--f-display);
  font-size: clamp(2rem,1rem+3vw,3.5rem);
  font-weight: 500; line-height:1;
  letter-spacing:-.02em;
  display:block;
}
.case-study__stat-label{
  font-family: var(--f-mono); font-size: var(--fs-micro);
  text-transform:uppercase; letter-spacing:.08em;
  color: var(--fg-mute);
}
.case-review{
  margin-top: var(--sp-5);
  padding: var(--sp-4);
  background: var(--bg-raised);
  border-radius: var(--r-md);
  border-left: 3px solid var(--flight);
}
.case-review__stars{ color: var(--sun); margin-bottom: var(--sp-2); letter-spacing:.05em; }
.case-review__text{
  font-family: var(--f-display); font-style:italic;
  font-size: var(--fs-body-l); line-height:1.4;
  margin-bottom: var(--sp-3);
}
.case-review__author{
  font-family: var(--f-mono); font-size: var(--fs-micro);
  text-transform:uppercase; letter-spacing:.06em;
  color: var(--fg-mute); font-style:normal;
}

/* Home portfolio card (3-up grid) */
.portfolio-card{
  position: relative;
  aspect-ratio: 4/3;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-raised);
}
.portfolio-card__inner{
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(11,12,14,.85) 0%, transparent 55%);
  display: flex; flex-direction: column; justify-content: flex-end;
  padding: var(--sp-5);
  opacity: 0;
  transition: opacity .4s var(--ease-out-expo);
}
.portfolio-card:hover .portfolio-card__inner{ opacity: 1; }
.portfolio-card__tag{
  font-family: var(--f-mono); font-size: var(--fs-micro);
  text-transform: uppercase; letter-spacing:.08em;
  color: rgba(255,255,255,.6); margin-bottom: var(--sp-2);
}
.portfolio-card__title{
  font-family: var(--f-display); font-size: var(--fs-h3);
  font-weight:500; color: var(--paper);
}

/* Testimonial card (from sheets) */
.testimonial-card{
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: var(--sp-5);
}
.testimonial-card__quote{
  font-family: var(--f-display); font-style:italic;
  font-size: var(--fs-body-l); line-height:1.45;
  margin-bottom: var(--sp-4);
}
.testimonial-card__author{ display:flex; gap: var(--sp-3); align-items:center; }
.testimonial-card__avatar{
  width:38px; height:38px; border-radius:50%;
  background: var(--ink); color: var(--paper);
  font-family: var(--f-mono); font-size: var(--fs-small); font-weight:600;
  display:flex; align-items:center; justify-content:center;
  flex-shrink:0;
}
.testimonial-card__name{ font-weight:600; font-size: var(--fs-body); }
.testimonial-card__role{
  font-family: var(--f-mono); font-size: var(--fs-micro);
  text-transform:uppercase; letter-spacing:.06em; color: var(--fg-mute);
}