/* =====================================================================
   DESIGN CASE STUDY — stylesheet
   Aesthetic: editorial design-studio · warm paper · ink · terracotta
   Fonts: Fraunces (display) · Hanken Grotesk (body) · Space Mono (labels)
   ===================================================================== */

   :root {
    --paper:      #F1EADB;
    --paper-2:    #E9E0CD;
    --ink:        #1A1712;
    --ink-soft:   #564E40;
    --accent:     #C1452A;   /* terracotta */
    --accent-2:   #1E4D44;   /* deep teal  */
    --line:       rgba(26,23,18,.16);
    --line-soft:  rgba(26,23,18,.09);
  
    --maxw: 1180px;
    --pad: clamp(20px, 5vw, 80px);
  
    --f-disp: "Fraunces", Georgia, serif;
    --f-body: "Hanken Grotesk", system-ui, sans-serif;
    --f-mono: "Space Mono", monospace;
  
    --ease: cubic-bezier(.2,.7,.2,1);
  }
  
  /* ---------- reset ---------- */
  * { margin:0; padding:0; box-sizing:border-box; }
  html { scroll-behavior:smooth; scroll-padding-top:84px; }
  body {
    background:var(--paper);
    color:var(--ink);
    font-family:var(--f-body);
    font-size:clamp(16px,1.05vw,18px);
    line-height:1.65;
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  img { display:block; max-width:100%; }
  a { color:inherit; text-decoration:none; }
  ul,ol { list-style:none; }
  
  /* ---------- grain + scroll progress ---------- */
  .grain {
    position:fixed; inset:0; z-index:9999; pointer-events:none; opacity:.05;
    background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='3'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  }
  .progress {
    position:fixed; top:0; left:0; height:3px; width:0%;
    background:var(--accent); z-index:1001; transition:width .1s linear;
  }
  
  /* =====================================================================
     NAVBAR
     ===================================================================== */
  .nav {
    position:fixed; top:0; left:0; right:0; z-index:1000;
    display:flex; align-items:center; justify-content:space-between;
    padding:14px var(--pad);
    background:color-mix(in srgb, var(--paper) 78%, transparent);
    backdrop-filter:blur(12px) saturate(1.2);
    border-bottom:1px solid transparent;
    transition:border-color .3s var(--ease), padding .3s var(--ease);
  }
  .nav.scrolled { border-bottom-color:var(--line); padding-top:10px; padding-bottom:10px; }
  
  .brand { display:flex; align-items:center; gap:10px; font-family:var(--f-mono); }
  .brand-mark { color:var(--accent); font-size:1.3rem; transform:translateY(1px); }
  .brand-text { font-size:.78rem; letter-spacing:.14em; font-weight:700; }
  .brand-sub { color:var(--ink-soft); font-weight:400; letter-spacing:.06em; margin-left:6px; }
  
  .nav-links { display:flex; gap:clamp(14px,1.7vw,30px); }
  .nav-links a {
    font-family:var(--f-mono); font-size:.74rem; letter-spacing:.06em;
    text-transform:uppercase; color:var(--ink-soft);
    position:relative; padding:4px 0; transition:color .25s var(--ease);
  }
  .nav-links a::after {
    content:""; position:absolute; left:0; bottom:-2px; height:2px; width:0;
    background:var(--accent); transition:width .3s var(--ease);
  }
  .nav-links a:hover { color:var(--ink); }
  .nav-links a:hover::after,
  .nav-links a.active::after { width:100%; }
  .nav-links a.active { color:var(--ink); }
  
  .burger {
    display:none; flex-direction:column; gap:5px; background:none; border:0;
    cursor:pointer; padding:6px;
  }
  .burger span { width:24px; height:2px; background:var(--ink); transition:.3s var(--ease); }
  .burger[aria-expanded="true"] span:nth-child(1){ transform:translateY(7px) rotate(45deg); }
  .burger[aria-expanded="true"] span:nth-child(2){ opacity:0; }
  .burger[aria-expanded="true"] span:nth-child(3){ transform:translateY(-7px) rotate(-45deg); }
  
  /* =====================================================================
     HERO
     ===================================================================== */
  .hero {
    min-height:100vh; position:relative;
    display:flex; flex-direction:column; justify-content:center;
    padding:130px var(--pad) 80px;
    max-width:var(--maxw); margin:0 auto;
    background:
      radial-gradient(60% 50% at 85% 15%, color-mix(in srgb,var(--accent) 14%,transparent), transparent 70%),
      radial-gradient(50% 50% at 5% 90%, color-mix(in srgb,var(--accent-2) 12%,transparent), transparent 70%);
  }
  .hero-meta {
    font-family:var(--f-mono); font-size:.78rem; letter-spacing:.08em;
    text-transform:uppercase; color:var(--ink-soft);
    display:flex; gap:14px; align-items:center; flex-wrap:wrap;
    animation:rise .8s var(--ease) both;
  }
  .hero-meta .dot { color:var(--accent); font-size:.5rem; }
  
  .hero-title {
    font-family:var(--f-disp); font-weight:400;
    font-size:clamp(3.2rem, 11vw, 9rem); line-height:.94;
    letter-spacing:-.02em; margin:.28em 0 .35em;
    font-variation-settings:"opsz" 144;
  }
  .hero-title .line{ display:block; animation:rise .9s var(--ease) both; }
  .hero-title .line:nth-child(1){ animation-delay:.08s; }
  .hero-title .line:nth-child(2){ animation-delay:.18s; }
  .hero-title .accent{
    font-style:italic; color:var(--accent);
    font-variation-settings:"opsz" 144,"wght" 500;
  }
  
  .hero-lede{
    max-width:46ch; font-size:clamp(1.05rem,1.6vw,1.3rem); color:var(--ink-soft);
    animation:rise 1s var(--ease) .28s both;
  }
  
  .hero-team{
    display:flex; flex-wrap:wrap; gap:38px; margin-top:48px;
    padding-top:26px; border-top:1px solid var(--line);
    animation:rise 1s var(--ease) .4s both;
  }
  .ht-item{ display:flex; flex-direction:column; gap:3px; }
  .ht-item .k{ font-family:var(--f-mono); font-size:.68rem; letter-spacing:.1em;
    text-transform:uppercase; color:var(--accent); }
  .ht-item .v{ font-size:.95rem; }
  
  .scroll-cue{
    position:absolute; left:var(--pad); bottom:34px;
    display:flex; flex-direction:column; align-items:center; gap:6px;
    font-family:var(--f-mono); font-size:.66rem; letter-spacing:.18em;
    text-transform:uppercase; color:var(--ink-soft);
  }
  .scroll-cue .arrow{ animation:bob 1.6s ease-in-out infinite; font-size:1rem; }
  
  /* =====================================================================
     SECTIONS (shared)
     ===================================================================== */
  .section{
    max-width:var(--maxw); margin:0 auto;
    padding:clamp(70px,11vh,140px) var(--pad);
    position:relative;
  }
  .section.alt{
    max-width:none;
    background:var(--paper-2);
    border-block:1px solid var(--line-soft);
  }
  .section.alt > *{ max-width:var(--maxw); margin-inline:auto; }
  
  .sec-head{ margin-bottom:54px; }
  .sec-num{
    display:block; font-family:var(--f-mono); font-size:1rem;
    color:var(--accent); letter-spacing:.1em;
  }
  .sec-kicker{
    display:inline-block; margin-top:6px;
    font-family:var(--f-mono); font-size:.78rem; letter-spacing:.16em;
    text-transform:uppercase; color:var(--ink-soft);
  }
  .sec-title{
    font-family:var(--f-disp); font-weight:400;
    font-size:clamp(2rem,5vw,3.6rem); line-height:1.02; letter-spacing:-.015em;
    margin-top:14px; max-width:18ch;
    font-variation-settings:"opsz" 90;
  }
  
  /* body copy */
  .body{ max-width:54ch; color:var(--ink-soft); }
  .body strong{ color:var(--ink); font-weight:700; }
  .body.lead{ font-size:clamp(1.1rem,1.8vw,1.45rem); max-width:60ch;
    color:var(--ink); line-height:1.5; }
  .lead strong{ box-shadow:inset 0 -.4em 0 color-mix(in srgb,var(--accent) 22%,transparent); }
  
  /* note lists */
  .note-list{ margin-top:24px; display:flex; flex-direction:column; gap:12px; }
  .note-list li{
    position:relative; padding-left:26px; color:var(--ink-soft);
    font-size:.98rem;
  }
  .note-list li::before{
    content:"→"; position:absolute; left:0; top:0;
    color:var(--accent); font-family:var(--f-mono);
  }
  .note-list.big li{ font-size:1.05rem; padding:14px 0 14px 26px;
    border-bottom:1px solid var(--line-soft); }
  
  /* layout grids */
  .grid-2{ display:grid; grid-template-columns:1fr 1fr; gap:48px; align-items:start; }
  .grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; margin-top:48px; }
  .gap-tight{ gap:20px; margin-top:24px; }
  
  /* =====================================================================
     PLACEHOLDERS  (.ph)
     ===================================================================== */
  .ph{
    position:relative; width:100%;
    border:1.5px dashed var(--line);
    border-radius:4px;
    background:
      repeating-linear-gradient(45deg,
        transparent, transparent 11px,
        color-mix(in srgb,var(--ink) 4%,transparent) 11px,
        color-mix(in srgb,var(--ink) 4%,transparent) 12px);
    display:flex; align-items:center; justify-content:center; flex-direction:column;
    color:var(--ink-soft); transition:.35s var(--ease);
    overflow:hidden;
    }
  .ph::before{
    content:attr(data-label);
    font-family:var(--f-disp); font-style:italic; font-size:clamp(1rem,1.8vw,1.4rem);
    color:var(--ink); padding:0 20px; text-align:center;
  }
  .ph-tag{
    margin-top:10px; font-family:var(--f-mono); font-size:.64rem;
    letter-spacing:.14em; text-transform:uppercase; color:var(--accent);
    border:1px solid var(--accent); border-radius:99px; padding:3px 10px;
  }
  .ph:hover{ border-color:var(--accent); background:color-mix(in srgb,var(--accent) 5%,var(--paper)); }
  
  .ph-tall{ aspect-ratio:4/5; }
  .ph-sq{ aspect-ratio:1/1; }
  .ph-wide{ aspect-ratio:16/10; }
  .ph-med{ aspect-ratio:3/2; }
  .ph-hero{ aspect-ratio:16/8; }
  .ph-lg { aspect-ratio: 16/9; }

  .ph img {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: contain;
    border-radius: 4px;
  }
  
  .ph:has(img)::before {
    display: none;
  }
  
  .ph:has(img) .ph-tag {
    display: none;
  }
  
  .ph:has(img) {
    background: none;
    border: none;
  }
  
  .showcase{ margin:14px 0 24px; }
  
  /* =====================================================================
     02 · mini cards
     ===================================================================== */
  .mini-cards{ margin-top:26px; display:grid; grid-template-columns:1fr 1fr; gap:12px; }
  .mini{
    border:1px solid var(--line); border-radius:4px; padding:14px 16px;
    font-size:.92rem; color:var(--ink-soft); background:color-mix(in srgb,var(--paper) 60%,transparent);
  }
  .mini-k{ display:block; font-family:var(--f-mono); font-size:.66rem; letter-spacing:.1em;
    text-transform:uppercase; color:var(--accent); margin-bottom:2px; }
  
  /* =====================================================================
     03 · rationale rows
     ===================================================================== */
  .rationale-rows{ margin-top:44px; border-top:1px solid var(--line); }
  .rat-row{
    display:grid; grid-template-columns:minmax(180px,.6fr) 1fr; gap:30px;
    padding:26px 0; border-bottom:1px solid var(--line); align-items:baseline;
  }
  .rat-q{ font-family:var(--f-disp); font-size:clamp(1.2rem,2.4vw,1.7rem);
    font-style:italic; line-height:1.15; }
  .rat-a{ color:var(--ink-soft); }
  
  /* =====================================================================
     04 · features
     ===================================================================== */
  .feature-strip{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; margin-top:40px; }
  .feat{ padding-top:18px; border-top:2px solid var(--accent); }
  .feat-n{ font-family:var(--f-disp); font-size:2.4rem; color:var(--accent); display:block;
    line-height:1; margin-bottom:8px; }
  .feat p{ color:var(--ink-soft); font-size:.96rem; }
  
  /* =====================================================================
     05 · pull quote
     ===================================================================== */
  .pull{ margin:10px 0 50px; padding:34px 0; border-block:1px solid var(--line); }
  .pull p{
    font-family:var(--f-disp); font-style:italic; font-weight:400;
    font-size:clamp(1.6rem,4.5vw,3rem); line-height:1.15; letter-spacing:-.01em;
    max-width:20ch;
  }
  
  /* =====================================================================
     06 · split
     ===================================================================== */
  .split{ display:grid; grid-template-columns:1fr auto 1fr; gap:44px; align-items:start; }
  .split-rule{ width:1px; background:var(--line); align-self:stretch; }
  .split-h{ font-family:var(--f-disp); font-size:1.6rem; font-weight:400; margin-bottom:6px; }
  
  /* =====================================================================
     07 · references
     ===================================================================== */
  .refs{ counter-reset:r; max-width:80ch; }
  .refs li{
    counter-increment:r; position:relative; padding:18px 0 18px 52px;
    border-bottom:1px solid var(--line-soft); color:var(--ink-soft);
  }
  .refs li::before{
    content:"[" counter(r) "]"; position:absolute; left:0; top:18px;
    font-family:var(--f-mono); font-size:.8rem; color:var(--accent);
  }
  .refs em{ color:var(--ink); font-style:italic; }
  .ref-note{ margin-top:18px; font-family:var(--f-mono); font-size:.74rem;
    letter-spacing:.06em; color:var(--ink-soft); text-transform:uppercase; }
  
  /* =====================================================================
     FOOTER
     ===================================================================== */
  .footer{ background:var(--ink); color:var(--paper); padding:clamp(50px,8vw,90px) var(--pad) 36px; }
  .foot-big{
    font-family:var(--f-disp); font-style:italic; font-weight:300;
    font-size:clamp(2.4rem,9vw,6rem); line-height:1; max-width:var(--maxw);
    margin:0 auto; color:color-mix(in srgb,var(--paper) 92%,var(--accent));
  }
  .foot-row{
    max-width:var(--maxw); margin:40px auto 0; padding-top:24px;
    border-top:1px solid rgba(241,234,219,.18);
    display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:14px;
    font-family:var(--f-mono); font-size:.74rem; letter-spacing:.06em;
    color:rgba(241,234,219,.7);
  }
  .to-top{ color:var(--paper); border-bottom:1px solid var(--accent); padding-bottom:2px; }
  .to-top:hover{ color:var(--accent); }
  
  /* =====================================================================
     ANIMATIONS
     ===================================================================== */
  .reveal{ opacity:0; transform:translateY(26px); transition:opacity .8s var(--ease), transform .8s var(--ease); }
  .reveal.in{ opacity:1; transform:none; }
  
  @keyframes rise{ from{ opacity:0; transform:translateY(24px); } to{ opacity:1; transform:none; } }
  @keyframes bob{ 0%,100%{ transform:translateY(0); } 50%{ transform:translateY(5px); } }
  
  @media (prefers-reduced-motion:reduce){
    *{ animation:none !important; transition:none !important; }
    .reveal{ opacity:1; transform:none; }
    html{ scroll-behavior:auto; }
  }
  
  /* =====================================================================
     RESPONSIVE
     ===================================================================== */
  @media (max-width:860px){
    .nav-links{
      position:fixed; inset:0 0 0 auto; width:min(78vw,320px);
      flex-direction:column; justify-content:center; gap:28px;
      background:var(--paper-2); padding:0 var(--pad);
      transform:translateX(100%); transition:transform .4s var(--ease);
      box-shadow:-20px 0 60px rgba(0,0,0,.12);
    }
    .nav-links.open{ transform:translateX(0); }
    .nav-links a{ font-size:1rem; }
    .burger{ display:flex; z-index:1001; }
  
    .grid-2,.grid-3,.mini-cards,.feature-strip{ grid-template-columns:1fr; }
    .grid-3{ grid-template-columns:1fr 1fr; }
    .rat-row{ grid-template-columns:1fr; gap:8px; }
    .split{ grid-template-columns:1fr; gap:34px; }
    .split-rule{ display:none; }
  }
  @media (max-width:520px){
    .grid-3{ grid-template-columns:1fr; }
    .hero-team{ gap:24px; }
  }