/* ============================================================
   IMPERIAL ENGINEERING LOGBOOK — design system
   Themes: [data-theme="imperial"|"light"]   Type: [data-type="chakra"|"editorial"]
   ============================================================ */

/* ---- fonts ---- */
@import url('https://fonts.googleapis.com/css2?family=Chakra+Petch:wght@400;500;600;700&family=Saira+Semi+Condensed:wght@500;600;700;800&family=Public+Sans:ital,wght@0,400;0,500;0,600;0,700;1,400&family=JetBrains+Mono:wght@400;500;700&display=swap');

/* ---- tokens ---- */
:root{
  --maxw: 1180px;
  --grid-size: 28px;
  --radius: 3px;
  --ease: cubic-bezier(.4,.05,.2,1);

  /* ---- SAIL WHITE / NAUTICAL BLUE palette ---- */
  --bg:#eef4fa;            /* sail white */
  --bg-2:#e4edf7;
  --panel:#ffffff;
  --panel-2:#f6fafe;
  --ink:#16314c;           /* deep navy ink */
  --ink-dim:#3d5571;
  --muted:#7286a0;
  --line:#cedeef;
  --line-bright:#aac3de;
  --accent:#1f6fc4;        /* sail blue */
  --accent-bright:#2f8be0;
  --grid: rgba(31,111,196,.10);
  --grid-bold: rgba(31,111,196,.20);
  --stamp:#1f6fc4;
  --cog: url("../assets/cog-red.svg");
  --cog-ghost: url("../assets/cog-navy.svg");
  --ghost-opacity: .05;
  --paper-shadow: 0 0 0 1px var(--line), 0 30px 70px -30px rgba(22,49,76,.45);
}

[data-type="chakra"]{
  --display:'Chakra Petch', sans-serif;
  --body:'Public Sans', sans-serif;
  --mono:'JetBrains Mono', monospace;
  --display-tracking: .01em;
  --display-weight: 700;
}
[data-type="editorial"]{
  --display:'Saira Semi Condensed', sans-serif;
  --body:'Public Sans', sans-serif;
  --mono:'JetBrains Mono', monospace;
  --display-tracking: -.01em;
  --display-weight: 800;
}

[data-type="imperial"]{ /* legacy hook, no-op */ }

*{box-sizing:border-box;}
html,body{margin:0;height:100%;}
body{
  background:#cdd9e6;
  color:var(--ink);
  font-family:var(--body);
  -webkit-font-smoothing:antialiased;
  overflow:hidden;
}

::selection{ background:var(--accent); color:#fff; }

/* ============================================================
   STAGE & FRAME
   ============================================================ */
.stage{
  height:100vh;width:100vw;overflow:auto;
  display:flex;justify-content:center;align-items:flex-start;
  padding:30px 30px 40px;
  background:
    radial-gradient(circle at 50% -10%, color-mix(in srgb,var(--accent) 12%, transparent), transparent 55%),
    #cdd9e6;
}
.stage::-webkit-scrollbar{width:11px;height:11px;}
.stage::-webkit-scrollbar-thumb{background:var(--line-bright);border-radius:6px;}
.stage::-webkit-scrollbar-track{background:transparent;}

.doc-frame{
  width:100%;max-width:var(--maxw);
  background:var(--bg);
  position:relative;
  box-shadow:var(--paper-shadow);
  display:flex;flex-direction:column;min-height:calc(100vh - 70px);
}

/* grid sheet background helper */
.sheet-grid{
  background-color:var(--bg);
  background-image:
    linear-gradient(var(--grid-bold) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-bold) 1px,transparent 1px),
    linear-gradient(var(--grid) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid) 1px,transparent 1px);
  background-size:
    calc(var(--grid-size)*5) calc(var(--grid-size)*5),
    calc(var(--grid-size)*5) calc(var(--grid-size)*5),
    var(--grid-size) var(--grid-size),
    var(--grid-size) var(--grid-size);
}

/* ============================================================
   DOC HEADER (persistent chrome)
   ============================================================ */
.doc-header{
  position:relative;z-index:6;
  display:flex;align-items:stretch;
  border-bottom:1px solid var(--line);
  background:var(--bg-2);
}
.brand{
  display:flex;align-items:center;gap:13px;
  padding:14px 22px;border-right:1px solid var(--line);
}
.brand .cog{
  width:34px;height:34px;flex:0 0 auto;
  background:var(--cog) center/contain no-repeat;
  filter:drop-shadow(0 0 7px color-mix(in srgb,var(--accent) 55%, transparent));
}
.brand .who{display:flex;flex-direction:column;line-height:1;}
.brand .who b{font-family:var(--display);font-weight:var(--display-weight);font-size:16px;letter-spacing:.08em;text-transform:uppercase;}
.brand .who span{font-family:var(--mono);font-size:9.5px;letter-spacing:.18em;color:var(--accent-bright);margin-top:4px;}

.nav{display:flex;align-items:stretch;flex:1;}
.nav-item{
  position:relative;flex:1;
  display:flex;flex-direction:column;justify-content:center;gap:3px;
  padding:0 16px;border-right:1px solid var(--line);
  background:transparent;cursor:pointer;color:var(--ink-dim);
  font-family:var(--mono);text-align:left;transition:background .15s, color .15s;
}
.nav-item:hover{background:color-mix(in srgb,var(--accent) 9%,transparent);color:var(--ink);}
.nav-item .idx{font-size:9px;letter-spacing:.15em;color:var(--muted);}
.nav-item .lbl{font-family:var(--display);font-weight:600;font-size:13px;letter-spacing:.06em;text-transform:uppercase;}
.nav-item.on{background:var(--accent);color:#fff;}
.nav-item.on .idx{color:rgba(255,255,255,.7);}
.nav-item.on::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;background:var(--accent-bright);}

/* ============================================================
   PAGE / LEAF (turning area)
   ============================================================ */
.leaf-stage{ position:relative;flex:1;perspective:2800px; }
.page{
  position:relative;z-index:1;
  min-height:100%;
  padding:0;
  display:flex;flex-direction:column;
}
.page-body{ flex:1;padding:46px 52px 30px; position:relative;z-index:2; }

/* faint cog watermark per page */
.page::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background-image:var(--cog-ghost);
  background-repeat:no-repeat;background-position:center 50%;background-size:560px;
  opacity:var(--ghost-opacity);
}

/* the turning leaf */
.flip-leaf{
  position:absolute;top:0;left:0;width:100%;z-index:9;
  transform-origin:left center;transform-style:preserve-3d;
  animation:leafTurn .82s var(--ease) forwards;
}
.flip-leaf .face{position:absolute;inset:0;backface-visibility:hidden;overflow:hidden;}
.flip-leaf .front{position:relative;}
.flip-leaf .back{
  transform:rotateY(180deg);background:var(--bg);
}
.flip-leaf .shade{position:absolute;inset:0;background:linear-gradient(100deg,rgba(0,0,0,.4),rgba(0,0,0,0) 60%);opacity:0;animation:leafShade .82s ease forwards;}
@keyframes leafTurn{
  from{transform:rotateY(0);box-shadow:0 0 0 rgba(0,0,0,0);}
  to{transform:rotateY(-179deg);box-shadow:30px 0 60px -10px rgba(0,0,0,.55);}
}
@keyframes leafShade{0%{opacity:0;}45%{opacity:1;}100%{opacity:0;}}
@keyframes settleIn{0%{opacity:.3;transform:translateX(7px);}100%{opacity:1;transform:translateX(0);}}
.settling{animation:settleIn .42s var(--ease) both;}

/* ============================================================
   SECTION HEADER (top of each page)
   ============================================================ */
.sec-head{
  display:flex;align-items:flex-end;justify-content:space-between;gap:20px;
  padding:22px 52px 18px;border-bottom:1px dashed var(--line-bright);
  position:relative;z-index:2;
}
.sec-head .lead{display:flex;flex-direction:column;gap:7px;}
.sec-head .kicker{font-family:var(--mono);font-size:10px;letter-spacing:.22em;color:var(--accent-bright);text-transform:uppercase;}
.sec-head h2{
  font-family:var(--display);font-weight:var(--display-weight);
  font-size:clamp(30px,4.4vw,52px);margin:0;line-height:.92;letter-spacing:var(--display-tracking);
  text-transform:uppercase;
}
.sec-head .meta{font-family:var(--mono);font-size:10.5px;color:var(--muted);text-align:right;line-height:1.7;}
.sec-head .meta b{color:var(--ink-dim);}

/* ============================================================
   TITLE BLOCK (engineering footer)
   ============================================================ */
.titleblock{
  display:grid;grid-template-columns: 2fr 1fr 1fr 1fr 1.4fr;
  border-top:1px solid var(--line);
  font-family:var(--mono);position:relative;z-index:2;background:var(--bg-2);
}
.tb-cell{ padding:9px 14px;border-right:1px solid var(--line); }
.tb-cell:last-child{border-right:none;}
.tb-cell .k{font-size:8.5px;letter-spacing:.16em;color:var(--muted);text-transform:uppercase;}
.tb-cell .v{font-size:12px;color:var(--ink);margin-top:3px;font-weight:500;}
.tb-cell .v.accent{color:var(--accent-bright);}

/* ============================================================
   PRIMITIVES
   ============================================================ */
.mono{font-family:var(--mono);}
.disp{font-family:var(--display);font-weight:var(--display-weight);text-transform:uppercase;letter-spacing:var(--display-tracking);}
.dim{color:var(--muted);}

.btn{
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  display:inline-flex;align-items:center;gap:9px;cursor:pointer;
  padding:11px 18px;border:1px solid var(--line-bright);border-radius:var(--radius);
  background:var(--panel);color:var(--ink);transition:.15s var(--ease);
}
.btn:hover{border-color:var(--accent);color:var(--ink);transform:translateY(-1px);}
.btn .arr{transition:transform .2s var(--ease);}
.btn:hover .arr{transform:translateX(4px);}
.btn.primary{background:var(--accent);border-color:var(--accent);color:#fff;}
.btn.primary:hover{background:var(--accent-bright);border-color:var(--accent-bright);}

.chip{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.1em;text-transform:uppercase;
  padding:4px 9px;border:1px solid var(--line);border-radius:2px;color:var(--ink-dim);
  background:color-mix(in srgb,var(--panel) 60%,transparent);white-space:nowrap;
}
.chip.live{border-color:var(--accent);color:var(--accent-bright);}

.panel{ background:var(--panel);border:1px solid var(--line);border-radius:var(--radius); }

/* project cards */
.projcard{transition:transform .16s var(--ease), border-color .16s var(--ease), box-shadow .16s var(--ease);}
.projcard:not(.nolink):hover{transform:translateY(-3px);border-color:var(--accent);box-shadow:0 14px 30px -18px rgba(22,49,76,.5);}
.projcard .openlbl{transition:transform .2s var(--ease);}
.projcard:hover .openlbl{transform:translateX(4px);}
.socrow{transition:background .14s var(--ease);}
.socrow:hover{background:color-mix(in srgb,var(--accent) 8%,transparent);}

/* form fields */
.field{transition:border-color .15s var(--ease), box-shadow .15s var(--ease);}
.field::placeholder{color:var(--muted);}
.field:focus{border-color:var(--accent)!important;box-shadow:0 0 0 3px color-mix(in srgb,var(--accent) 15%,transparent);}

/* registration crosshair */
.reg{position:absolute;width:16px;height:16px;z-index:3;opacity:.5;pointer-events:none;}
.reg::before,.reg::after{content:"";position:absolute;background:var(--accent);}
.reg::before{left:50%;top:0;bottom:0;width:1px;transform:translateX(-.5px);}
.reg::after{top:50%;left:0;right:0;height:1px;transform:translateY(-.5px);}
.reg.tl{top:10px;left:10px;} .reg.tr{top:10px;right:10px;} .reg.bl{bottom:10px;left:10px;} .reg.br{bottom:10px;right:10px;}

/* stamp */
.stamp{
  font-family:var(--display);font-weight:700;text-transform:uppercase;letter-spacing:.08em;
  color:var(--stamp);border:2px solid var(--stamp);border-radius:4px;
  padding:6px 12px;font-size:13px;display:inline-block;transform:rotate(-7deg);
  opacity:.85;box-shadow:0 0 0 1px color-mix(in srgb,var(--stamp) 30%,transparent) inset;
}

/* dimension callout (schematic hero) */
.callout{position:absolute;font-family:var(--mono);font-size:10px;letter-spacing:.1em;color:var(--accent-bright);text-transform:uppercase;display:flex;align-items:center;gap:8px;}
.callout .line{height:1px;background:var(--accent);}
.callout .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);flex:0 0 auto;}

/* image placeholder */
.imgph{
  position:relative;overflow:hidden;background:var(--panel);
  border:1px solid var(--line);border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;
}
.realphoto{
  position:relative;overflow:hidden;background:var(--panel) center/cover no-repeat;
  border:1px solid var(--line);border-radius:var(--radius);
  background-size:cover;background-position:center;
  filter:saturate(.92) contrast(1.02);
}
.photoframe .realphoto{transition:transform .2s var(--ease), box-shadow .2s var(--ease), filter .2s var(--ease);}
.photoframe:hover .realphoto{transform:translateY(-3px);box-shadow:0 14px 30px -16px rgba(22,49,76,.55);filter:saturate(1) contrast(1.05);}
.photoframe .mono{transition:color .15s var(--ease);}
.photoframe:hover .mono{color:var(--accent-bright);}
.projthumb{
  background:#0a0b0d center top/cover no-repeat;
}
.projthumb.contain{
  background:radial-gradient(circle at 50% 42%, #fff7ee 0%, #f0e6d6 68%, #e4d9c4 100%);
  display:flex;align-items:center;justify-content:center;padding:10px;
}
.projthumb.contain img{
  max-width:74%;max-height:88%;object-fit:contain;
}
.projthumb.banner{
  background:radial-gradient(circle at 50% 50%, #fcfaf4 0%, #f3eee2 100%);
  display:flex;align-items:center;justify-content:center;padding:14px;
}
.projthumb.banner img{
  max-width:94%;max-height:70%;object-fit:contain;
}
.imgph::before{
  content:"";position:absolute;inset:0;
  background-image:repeating-linear-gradient(45deg,color-mix(in srgb,var(--line) 60%,transparent) 0 1px,transparent 1px 12px);
  opacity:.7;
}
.imgph .tag{position:relative;font-family:var(--mono);font-size:10px;letter-spacing:.12em;color:var(--muted);text-transform:uppercase;background:var(--bg);padding:4px 9px;border:1px solid var(--line);}

/* scrollbar inside page sections that scroll */
.scroller{overflow:auto;}
.scroller::-webkit-scrollbar{width:8px;height:8px;}
.scroller::-webkit-scrollbar-thumb{background:var(--line-bright);border-radius:5px;}

/* dividers */
.hr{height:1px;background:var(--line);border:none;margin:26px 0;}
.hr.dash{height:0;border-top:1px dashed var(--line-bright);background:none;}