/* Rockstone shared styles */

  :root{
    --ink:#1c1a17;
    --paper:#f3eee5;
    --paper-2:#faf7f1;
    --stone:#847c6d;
    --stone-line: rgba(28,26,23,0.14);
    --rust:#b75b2b;
    --rust-dark:#8f4620;
    --deep:#211f1a;
    --deep-2:#2a2722;
    --good:#4c5c47;
  }

  *{box-sizing:border-box;margin:0;padding:0;}
  html{scroll-behavior:smooth;}
  body{
    background:var(--paper);
    color:var(--ink);
    font-family:'Inter',sans-serif;
    line-height:1.5;
    -webkit-font-smoothing:antialiased;
  }
  img,svg{display:block;max-width:100%;}
  a{color:inherit;text-decoration:none;}
  ul{list-style:none;}
  .wrap{max-width:1400px;margin:0 auto;padding:0 40px;}
  @media (max-width:1500px){.wrap{max-width:1240px;}}
  @media (max-width:640px){.wrap{padding:0 20px;}}

  /* wide-screen breathing room */
  @media (min-width:1600px){
    .wrap{max-width:1560px;padding:0 48px;}
    body{font-size:16.5px;}
    .hero h1{font-size:clamp(44px,4.6vw,72px);}
  }

  h1,h2,h3{font-family:'Fraunces',serif;font-weight:560;letter-spacing:-0.01em;}
  .eyebrow{
    font-family:'IBM Plex Mono',monospace;
    font-size:12px;
    letter-spacing:0.14em;
    text-transform:uppercase;
    color:var(--rust-dark);
    display:flex;align-items:center;gap:10px;
  }
  .eyebrow::before{content:"";width:16px;height:1px;background:var(--rust);display:inline-block;}

  :focus-visible{outline:2px solid var(--rust);outline-offset:3px;}
  @media (prefers-reduced-motion: reduce){
    *{animation-duration:0.01ms !important;animation-iteration-count:1 !important;transition-duration:0.01ms !important;scroll-behavior:auto !important;}
  }

  /* ---------- depth rail (signature element) ---------- */
  .depth-rail{
    position:fixed;
    left:26px;top:50%;
    transform:translateY(-50%);
    z-index:40;
    display:flex;flex-direction:column;align-items:flex-start;gap:0;
    font-family:'IBM Plex Mono',monospace;
    font-size:10px;
    letter-spacing:0.08em;
    color:var(--stone);
  }
  .depth-rail::before{
    content:"";
    position:absolute;left:3px;top:6px;bottom:6px;width:1px;
    background:linear-gradient(to bottom, transparent, var(--stone-line) 10%, var(--stone-line) 90%, transparent);
  }
  .depth-mark{
    position:relative;
    padding:11px 0 11px 16px;
    cursor:pointer;
    text-transform:uppercase;
    transition:color .25s ease;
  }
  .depth-mark::before{
    content:"";
    position:absolute;left:0;top:50%;transform:translateY(-50%);
    width:7px;height:7px;border-radius:50%;
    background:var(--paper-2);
    border:1px solid var(--stone-line);
    transition:all .25s ease;
  }
  .depth-mark.active{color:var(--ink);}
  .depth-mark.active::before{background:var(--rust);border-color:var(--rust);box-shadow:0 0 0 3px rgba(183,91,43,0.18);}
  @media (max-width:980px){.depth-rail{display:none;}}

  /* ---------- header ---------- */
  header{
    position:sticky;top:0;z-index:50;
    background:rgba(243,238,229,0.88);
    backdrop-filter:blur(10px);
    border-bottom:1px solid var(--stone-line);
  }
  .nav{display:flex;align-items:center;justify-content:space-between;height:76px;}
  .logo{display:flex;align-items:center;gap:9px;font-family:'Fraunces',serif;font-weight:650;font-size:21px;letter-spacing:-0.01em;}
  .logo .mark{width:22px;height:22px;flex-shrink:0;}
  .nav-links{display:flex;align-items:center;gap:34px;font-size:14.5px;font-weight:500;}
  .nav-links a{position:relative;padding:4px 0;color:var(--ink);}
  .nav-links a::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:var(--rust);transform:scaleX(0);transform-origin:left;transition:transform .25s ease;}
  .nav-links a:hover::after{transform:scaleX(1);}
  .nav-links a.active-link{color:var(--rust-dark);}
  .nav-links a.active-link::after{transform:scaleX(1);}
  .nav-cta{display:flex;align-items:center;gap:14px;}
  .btn{
    display:inline-flex;align-items:center;justify-content:center;gap:8px;
    font-family:'Inter',sans-serif;font-weight:600;font-size:14px;
    padding:12px 22px;border-radius:3px;
    border:1px solid transparent;
    cursor:pointer;transition:all .2s ease;
    white-space:nowrap;
  }
  .btn-primary{background:var(--rust);color:#fff;}
  .btn-primary:hover{background:var(--rust-dark);}
  .btn-ghost{background:transparent;color:var(--ink);border-color:var(--stone-line);}
  .btn-ghost:hover{border-color:var(--ink);}
  .btn-light{background:var(--paper);color:var(--ink);}
  .btn-light:hover{background:#fff;}
  .btn-outline-light{background:transparent;color:#fff;border-color:rgba(255,255,255,0.35);}
  .btn-outline-light:hover{border-color:#fff;}
  .hide-mobile{display:inline-flex;}
  @media (max-width:980px){.nav-links{display:none;} .hide-mobile{display:none;}}

  /* ---------- hero ---------- */
  .hero{padding:96px 0 64px;position:relative;overflow:hidden;}
  .hero-grid{display:grid;grid-template-columns:1.05fr 0.95fr;gap:56px;align-items:center;}
  @media (max-width:900px){.hero-grid{grid-template-columns:1fr;} .hero{padding:56px 0 40px;}}
  .hero h1{font-size:clamp(38px,5.4vw,64px);line-height:1.04;margin:18px 0 22px;max-width:11.5ch;}
  .hero h1 em{font-style:normal;color:var(--rust);}
  .hero p{font-size:18px;color:#4a463e;max-width:46ch;margin-bottom:34px;}
  .hero-actions{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:44px;}
  .btn-lg{padding:15px 28px;font-size:15px;}
  .hero-stats{display:flex;gap:36px;flex-wrap:wrap;}
  .hero-stats div{border-left:2px solid var(--rust);padding-left:14px;}
  .hero-stats .num{font-family:'Fraunces',serif;font-weight:560;font-size:26px;display:block;}
  .hero-stats .lbl{font-size:12.5px;color:var(--stone);}

  .core-sample{
    position:relative;
    aspect-ratio:3/4;
    max-width:460px;
    margin-inline-start:auto;
    border-radius:6px;
    overflow:hidden;
    background:linear-gradient(180deg,#e7dfcd 0%, #cbb894 22%, #a68a63 42%, #7c6247 62%, #55402c 80%, #33241a 100%);
    box-shadow:0 30px 60px -20px rgba(28,26,23,0.35);
  }
  .core-sample .band{position:absolute;left:0;right:0;height:1px;background:rgba(28,26,23,0.15);}
  .core-tag{
    position:absolute;background:rgba(250,247,241,0.94);
    font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.06em;
    padding:7px 11px;border-radius:2px;color:var(--ink);
    box-shadow:0 8px 20px rgba(0,0,0,0.15);
  }

  /* ---------- strata divider (signature element) ---------- */
  .strata{width:100%;height:64px;display:block;}
  .strata-1{fill:var(--paper-2);}
  .strata-2{fill:var(--deep);}
  .strata-3{fill:var(--paper);}

  /* ---------- section shells ---------- */
  section{position:relative;}
  .section-pad{padding:88px 0;}
  @media (max-width:640px){.section-pad{padding:56px 0;}}
  .section-head{max-width:640px;margin-bottom:52px;}
  .section-head h2{font-size:clamp(28px,3.4vw,40px);margin-top:14px;line-height:1.12;}
  .section-head p{color:#4a463e;font-size:16.5px;margin-top:14px;}

  .bg-alt{background:var(--paper-2);}
  .bg-deep{background:var(--deep);color:#efece5;}
  .bg-deep .eyebrow{color:#d3a679;}
  .bg-deep .eyebrow::before{background:var(--rust);}
  .bg-deep .section-head p{color:#b8b3a8;}

  /* ---------- programs ---------- */
  .program-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:var(--stone-line);border:1px solid var(--stone-line);}
  @media (max-width:900px){.program-grid{grid-template-columns:repeat(2,1fr);}}
  @media (max-width:560px){.program-grid{grid-template-columns:1fr;}}
  .program-card{
    background:var(--paper-2);
    padding:30px 26px 26px;
    transition:background .2s ease;
  }
  .program-card:hover{background:#fff;}
  .program-card .icon{
    width:38px;height:38px;border-radius:50%;
    background:rgba(183,91,43,0.1);color:var(--rust-dark);
    display:flex;align-items:center;justify-content:center;
    font-family:'Fraunces',serif;font-weight:650;font-size:15px;
    margin-bottom:20px;
  }
  .program-card h3{font-size:18px;font-weight:560;margin-bottom:8px;}
  .program-card .terms{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--stone);margin-bottom:14px;}
  .program-card .terms b{color:var(--good);font-weight:500;}
  .program-card a{font-size:13.5px;font-weight:600;color:var(--rust-dark);display:inline-flex;align-items:center;gap:5px;}
  .program-card a:hover{text-decoration:underline;}

  /* ---------- tools ---------- */
  .tool-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:22px;}
  @media (max-width:900px){.tool-grid{grid-template-columns:repeat(2,1fr);}}
  @media (max-width:560px){.tool-grid{grid-template-columns:1fr;}}
  .tool-card{
    border:1px solid var(--stone-line);border-radius:6px;
    padding:28px 24px;background:var(--paper);
    transition:transform .2s ease, box-shadow .2s ease;
  }
  .tool-card:hover{transform:translateY(-4px);box-shadow:0 18px 34px -18px rgba(28,26,23,0.25);}
  .tool-num{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--rust);margin-bottom:16px;}
  .tool-card h3{font-size:18px;margin-bottom:10px;}
  .tool-card p{font-size:14.5px;color:#5b5648;margin-bottom:18px;}
  .tool-card a{font-size:13.5px;font-weight:600;color:var(--ink);border-bottom:1px solid var(--ink);padding-bottom:2px;}

  /* ---------- features ---------- */
  .feature-list{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;background:rgba(255,255,255,0.08);border-top:1px solid rgba(255,255,255,0.12);}
  @media (max-width:760px){.feature-list{grid-template-columns:1fr;}}
  .feature{background:var(--deep);padding:34px 8px 34px 0;display:flex;gap:20px;}
  .feature .fnum{font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--rust);flex-shrink:0;padding-top:3px;}
  .feature h3{font-size:19px;color:#fff;margin-bottom:8px;font-weight:560;}
  .feature p{font-size:14.5px;color:#b8b3a8;max-width:38ch;}

  /* ---------- CTA band ---------- */
  .cta-band{
    background:linear-gradient(120deg, var(--rust) 0%, var(--rust-dark) 100%);
    color:#fff;border-radius:8px;padding:56px 48px;
    display:flex;align-items:center;justify-content:space-between;gap:32px;flex-wrap:wrap;
  }
  .cta-band h2{color:#fff;font-size:clamp(26px,3vw,34px);max-width:20ch;}
  .cta-band p{color:rgba(255,255,255,0.85);margin-top:10px;max-width:44ch;}

  /* ---------- footer ---------- */
  footer{background:var(--deep-2);color:#c9c4b8;padding-top:72px;}
  .foot-top{display:flex;justify-content:space-between;gap:40px;flex-wrap:wrap;padding-bottom:52px;border-bottom:1px solid rgba(255,255,255,0.1);}
  .foot-brand{max-width:280px;}
  .foot-brand .logo{color:#fff;}
  .foot-brand p{font-size:14px;color:#8f8a7c;margin-top:16px;}
  .foot-cols{display:flex;gap:56px;flex-wrap:wrap;}
  .foot-col h4{font-family:'IBM Plex Mono',monospace;font-size:11.5px;letter-spacing:.1em;text-transform:uppercase;color:#8f8a7c;margin-bottom:16px;}
  .foot-col li{margin-bottom:11px;font-size:14px;}
  .foot-col a:hover{color:#fff;}
  .foot-bottom{display:flex;justify-content:space-between;align-items:center;padding:26px 0;flex-wrap:wrap;gap:14px;font-size:13px;color:#77725f;}
  .foot-socials{display:flex;gap:16px;}
  .foot-socials a{width:30px;height:30px;border-radius:50%;border:1px solid rgba(255,255,255,0.15);display:flex;align-items:center;justify-content:center;transition:border-color .2s ease;}
  .foot-socials a:hover{border-color:#fff;}

  /* reveal-on-scroll */
  .reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease, transform .6s ease;}
  .reveal.in{opacity:1;transform:none;}

  /* ---------- inner page header ---------- */
  .page-hero{padding:64px 0 48px;border-bottom:1px solid var(--stone-line);}
  .page-hero h1{font-size:clamp(32px,4vw,50px);margin-top:14px;max-width:16ch;}
  .page-hero p{font-size:17px;color:#4a463e;max-width:56ch;margin-top:14px;}
  .breadcrumb{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--stone);letter-spacing:.04em;margin-bottom:6px;}
  .breadcrumb a:hover{color:var(--ink);}

  /* ---------- program detail rows ---------- */
  .program-groups{display:flex;flex-direction:column;gap:64px;}
  .group-label{display:flex;align-items:baseline;gap:14px;margin-bottom:26px;}
  .group-label h2{font-size:22px;}
  .group-label span{font-family:'IBM Plex Mono',monospace;font-size:12px;color:var(--stone);}
  .program-row{
    display:grid;grid-template-columns:44px 1.4fr 1fr 1fr auto;gap:24px;align-items:center;
    padding:22px 0;border-bottom:1px solid var(--stone-line);
  }
  .program-row:first-of-type{border-top:1px solid var(--stone-line);}
  @media (max-width:900px){.program-row{grid-template-columns:1fr;gap:8px;padding:20px 0;}}
  .program-row .rnum{font-family:'IBM Plex Mono',monospace;color:var(--rust);font-size:13px;}
  .program-row h3{font-size:18px;font-weight:560;}
  .program-row .meta{font-family:'IBM Plex Mono',monospace;font-size:12.5px;color:var(--stone);}
  .program-row .meta b{color:var(--good);font-weight:500;}
  .program-row a.rlink{font-size:13.5px;font-weight:600;color:var(--rust-dark);white-space:nowrap;}
  .program-row a.rlink:hover{text-decoration:underline;}

  /* ---------- tools detail ---------- */
  .tool-detail{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;padding:64px 0;border-bottom:1px solid var(--stone-line);}
  .tool-detail:last-child{border-bottom:none;}
  .tool-detail.reverse{direction:rtl;}
  .tool-detail.reverse > *{direction:ltr;}
  @media (max-width:900px){.tool-detail, .tool-detail.reverse{grid-template-columns:1fr;direction:ltr;gap:28px;}}
  .tool-visual{
    aspect-ratio:16/11;border-radius:8px;
    background:linear-gradient(135deg,var(--paper-2),#e6dfce);
    border:1px solid var(--stone-line);
    display:flex;align-items:center;justify-content:center;
    font-family:'IBM Plex Mono',monospace;font-size:13px;color:var(--stone);
    position:relative;overflow:hidden;
  }
  .tool-visual::before{content:"";position:absolute;inset:18px;border:1px dashed var(--stone-line);border-radius:4px;}
  .tool-detail h2{font-size:clamp(24px,2.6vw,32px);margin-bottom:14px;}
  .tool-detail p{color:#4a463e;font-size:15.5px;margin-bottom:22px;max-width:46ch;}
  .tool-detail ul{margin-bottom:24px;}
  .tool-detail li{font-size:14.5px;color:#4a463e;padding-left:20px;position:relative;margin-bottom:9px;}
  .tool-detail li::before{content:"—";position:absolute;left:0;color:var(--rust);}

  /* ---------- resources / cards ---------- */
  .article-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;}
  @media (max-width:980px){.article-grid{grid-template-columns:repeat(2,1fr);}}
  @media (max-width:640px){.article-grid{grid-template-columns:1fr;}}
  .article-card{border:1px solid var(--stone-line);border-radius:6px;overflow:hidden;background:var(--paper-2);transition:transform .2s ease, box-shadow .2s ease;}
  .article-card:hover{transform:translateY(-4px);box-shadow:0 18px 34px -18px rgba(28,26,23,0.25);}
  .article-thumb{aspect-ratio:16/10;background:linear-gradient(135deg,#cbb894,#7c6247);}
  .article-body{padding:22px 22px 26px;}
  .article-cat{font-family:'IBM Plex Mono',monospace;font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--rust-dark);margin-bottom:10px;}
  .article-card h3{font-size:17px;line-height:1.3;margin-bottom:10px;}
  .article-card p{font-size:13.5px;color:var(--stone);}

  /* ---------- careers ---------- */
  .role-list{border-top:1px solid var(--stone-line);}
  .role-row{display:grid;grid-template-columns:1.6fr 1fr 1fr auto;gap:20px;align-items:center;padding:24px 0;border-bottom:1px solid var(--stone-line);}
  @media (max-width:800px){.role-row{grid-template-columns:1fr;gap:8px;}}
  .role-row h3{font-size:17px;font-weight:560;}
  .role-row .meta{font-family:'IBM Plex Mono',monospace;font-size:12.5px;color:var(--stone);}
  .culture-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-bottom:64px;}
  @media (max-width:800px){.culture-grid{grid-template-columns:1fr;}}
  .culture-card{padding:28px;border:1px solid var(--stone-line);border-radius:6px;background:var(--paper-2);}
  .culture-card h3{font-size:17px;margin-bottom:8px;}
  .culture-card p{font-size:14px;color:#5b5648;}

  /* ---------- contact ---------- */
  .contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;padding:64px 0;}
  @media (max-width:900px){.contact-grid{grid-template-columns:1fr;gap:36px;}}
  .contact-info dt{font-family:'IBM Plex Mono',monospace;font-size:11.5px;text-transform:uppercase;letter-spacing:.08em;color:var(--stone);margin-top:26px;margin-bottom:6px;}
  .contact-info dt:first-child{margin-top:0;}
  .contact-info dd{font-size:16px;}
  .field{margin-bottom:20px;}
  .field label{display:block;font-size:13px;font-weight:600;margin-bottom:8px;}
  .field input, .field textarea, .field select{
    width:100%;padding:13px 14px;border:1px solid var(--stone-line);border-radius:4px;
    background:var(--paper-2);font-family:'Inter',sans-serif;font-size:14.5px;color:var(--ink);
  }
  .field input:focus, .field textarea:focus, .field select:focus{outline:2px solid var(--rust);outline-offset:1px;border-color:var(--rust);}
  .field textarea{resize:vertical;min-height:120px;}
  .form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
  @media (max-width:560px){.form-row{grid-template-columns:1fr;}}