:root{
  --bg:#FFFFFF;
  --bg-2:#F8FAFC;
  --panel:#FFFFFF;
  --panel-2:#F1F5F9;
  --line:rgba(14,165,233,0.15);
  --line-strong:rgba(14,165,233,0.3);
  --line-soft:rgba(14,165,233,0.08);
  --ink:#0F172A;
  --ink-dim:#475569;
  --ink-faint:#94A3B8;

  --redline:#DC2626;
  --redline-dim:rgba(220,38,38,0.15);

  --violet:#7C3AED;
  --cyan:#0EA5E9;
  --amber:#F59E0B;
  --sage:#10B981;

  --radius:4px;

  --font-mono:'IBM Plex Mono', ui-monospace, 'SFMono-Regular', monospace;
  --font-sans:'IBM Plex Sans', -apple-system, sans-serif;
}

[data-theme="dark"]{
  --bg:#0B1D2C;
  --bg-2:#0E2337;
  --panel:#102A40;
  --panel-2:#153352;
  --line:rgba(158,201,224,0.14);
  --line-strong:rgba(158,201,224,0.30);
  --line-soft:rgba(158,201,224,0.07);
  --ink:#EAF3F8;
  --ink-dim:#87ABC0;
  --ink-faint:#527189;

  --redline:#E2604F;
  --redline-dim:rgba(226,96,79,0.4);

  --violet:#A98FDE;
  --cyan:#4FBFCB;
  --amber:#E8A33D;
  --sage:#7FB88F;
}

*{box-sizing:border-box;}
html{scroll-behavior:smooth;}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:0.001ms !important; animation-iteration-count:1 !important; transition-duration:0.001ms !important;}
}

body{
  margin:0;
  background:
    repeating-linear-gradient(0deg, var(--line-soft) 0, var(--line-soft) 1px, transparent 1px, transparent 88px),
    repeating-linear-gradient(90deg, var(--line-soft) 0, var(--line-soft) 1px, transparent 1px, transparent 88px),
    repeating-linear-gradient(0deg, rgba(14,165,233,0.02) 0, rgba(14,165,233,0.02) 1px, transparent 1px, transparent 22px),
    repeating-linear-gradient(90deg, rgba(14,165,233,0.02) 0, rgba(14,165,233,0.02) 1px, transparent 1px, transparent 22px),
    var(--bg);
  color:var(--ink);
  font-family:var(--font-sans);
  line-height:1.55;
  -webkit-font-smoothing:antialiased;
  transition:background 0.3s ease, color 0.3s ease;
}

[data-theme="dark"] body{
  background:
    repeating-linear-gradient(0deg, var(--line-soft) 0, var(--line-soft) 1px, transparent 1px, transparent 88px),
    repeating-linear-gradient(90deg, var(--line-soft) 0, var(--line-soft) 1px, transparent 1px, transparent 88px),
    repeating-linear-gradient(0deg, rgba(158,201,224,0.035) 0, rgba(158,201,224,0.035) 1px, transparent 1px, transparent 22px),
    repeating-linear-gradient(90deg, rgba(158,201,224,0.035) 0, rgba(158,201,224,0.035) 1px, transparent 1px, transparent 22px),
    var(--bg);
}

a{color:inherit;}
:focus-visible{outline:1.5px solid var(--cyan); outline-offset:2px;}

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

code{
  font-family:var(--font-mono); font-size:0.9em; color:var(--amber);
  background:rgba(232,163,61,0.1); padding:1px 6px; border-radius:2px;
}

/* ---------- corner registration marks ---------- */
.crop{
  position:relative;
}
.crop::before, .crop::after{
  content:'';
  position:absolute; width:16px; height:16px; pointer-events:none;
  background:
    linear-gradient(to right, var(--mark-color, var(--line-strong)) 1.5px, transparent 1.5px) top left / 16px 1.5px no-repeat,
    linear-gradient(to bottom, var(--mark-color, var(--line-strong)) 1.5px, transparent 1.5px) top left / 1.5px 16px no-repeat;
}
.crop::before{ top:-1px; left:-1px; }
.crop::after{
  top:auto; left:auto; bottom:-1px; right:-1px;
  transform:rotate(180deg);
}

/* ---------- topbar ---------- */
.topbar{
  position:sticky; top:0; z-index:20;
  background:linear-gradient(90deg, rgba(14,165,233,0.08), rgba(14,165,233,0.03));
  backdrop-filter: blur(8px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  max-width:1180px; margin:0 auto; padding:14px 24px;
  display:flex; align-items:center; justify-content:space-between; gap:20px;
}
.brand{ display:flex; align-items:center; gap:10px; font-family:var(--font-mono); font-weight:600; letter-spacing:0.02em; font-size:14px;}
.brand-mark{
  width:9px; height:9px; border:1.5px solid var(--redline);
  transform:rotate(45deg); flex-shrink:0;
}
.brand-text{ text-transform:uppercase; letter-spacing:0.08em; }
.brand-accent{ color:var(--redline); }
.topnav{ display:flex; gap:26px; font-size:13px; color:var(--cyan); font-family:var(--font-mono);}
.topnav a{ text-decoration:none; letter-spacing:0.03em; color:var(--cyan); font-weight:500; }
.topnav a:hover{ color:var(--redline); }

.nav-sync-status{
  display:flex; align-items:center; gap:6px;
  padding:6px 10px; border-radius:var(--radius);
  background:var(--panel); border:1px solid var(--line);
  white-space:nowrap;
}

.theme-toggle{
  display:flex; align-items:center; justify-content:center;
  width:40px; height:40px; padding:0;
  background:var(--panel); border:1px solid var(--line-strong);
  border-radius:var(--radius); cursor:pointer;
  color:var(--ink-dim); transition:all .15s ease;
}
.theme-toggle:hover{ border-color:var(--cyan); color:var(--cyan); background:var(--panel-2); }
.theme-toggle .icon-sun{ display:none; }
.theme-toggle .icon-moon{ display:block; }
[data-theme="dark"] .theme-toggle .icon-sun{ display:block; }
[data-theme="dark"] .theme-toggle .icon-moon{ display:none; }

.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:12.5px; font-weight:500; letter-spacing:0.02em;
  padding:10px 16px; border-radius:var(--radius); border:1px solid var(--line-strong);
  cursor:pointer; text-decoration:none; white-space:nowrap;
  transition:border-color .15s ease, background .15s ease, transform .1s ease;
  background:transparent; color:var(--ink);
}
.btn:hover{ border-color:var(--ink-dim); }
.btn:active{ transform:translateY(1px); }
.btn-ghost{ background:var(--cyan); color:#FFFFFF; border-color:var(--cyan); }
.btn-ghost:hover{ background:#0284C7; border-color:#0284C7; color:#FFFFFF; }
.btn-primary{
  background:var(--redline); border-color:var(--redline); color:#FFFFFF; font-weight:600;
}
.btn-primary:hover{ background:#B91C1C; border-color:#B91C1C; }
.btn-outline{ border-color:var(--cyan); color:var(--cyan); }
.btn-outline:hover{ background:rgba(14,165,233,0.1); }
.btn-wide{ width:100%; justify-content:center; padding:13px 16px; font-size:13px; }
.btn-cal{
  font-family:var(--font-mono); font-size:11px; font-weight:500;
  padding:6px 11px; border-radius:var(--radius); border:1px solid var(--line-strong);
  background:transparent; color:var(--ink-dim); text-decoration:none;
  display:inline-flex; align-items:center; gap:6px; transition:all .15s ease;
}
.btn-cal:hover{ border-color:var(--card-color, var(--cyan)); color:var(--card-color, var(--cyan)); }

/* ---------- hero ---------- */
.hero{
  max-width:1180px; margin:0 auto; padding:56px 24px 20px;
  position:relative;
}
.hero-top{
  display:grid; grid-template-columns:1.4fr 0.9fr; gap:44px; align-items:start;
}
.eyebrow{
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:0.16em;
  color:var(--redline); margin:0 0 16px; text-transform:uppercase;
  display:flex; align-items:center; gap:8px;
}
.eyebrow::before{ content:''; width:14px; height:1px; background:var(--redline); }
.hero-title{
  font-family:var(--font-mono); font-weight:600;
  font-size:clamp(30px, 4vw, 46px); line-height:1.08; margin:0 0 18px;
  letter-spacing:-0.01em;
}
.hero-title em{ font-style:normal; color:var(--ink-dim); }
.hero-sub{ color:var(--ink-dim); font-size:15.5px; max-width:54ch; margin:0 0 28px;}
.hero-sub strong{ color:var(--ink); font-weight:600; }
.hero-actions{ display:flex; gap:12px; flex-wrap:wrap; margin-bottom:32px; }

/* title block */
.title-block{
  --mark-color: var(--redline);
  display:grid; grid-template-columns:1.6fr 1fr 0.7fr 0.9fr 0.8fr 0.6fr;
  border:1px solid var(--line-strong);
  background:var(--panel);
  box-shadow:0 1px 3px rgba(14,165,233,0.08);
}
.tb-cell{
  padding:10px 14px; border-left:1px solid var(--line);
  display:flex; flex-direction:column; gap:4px; min-width:0;
}
.tb-cell:first-child{ border-left:none; }
.tb-label{
  font-family:var(--font-mono); font-size:9.5px; letter-spacing:0.1em; text-transform:uppercase;
  color:var(--ink-faint);
}
.tb-value{
  font-family:var(--font-mono); font-size:13px; font-weight:600; color:var(--ink);
  white-space:nowrap; overflow:hidden; text-overflow:ellipsis;
}

/* instrument panel (gauges) */
.instruments{
  display:grid; grid-template-columns:1fr 1fr; gap:12px;
  border:1px solid var(--line); background:var(--panel);
  padding:14px;
  box-shadow:0 1px 3px rgba(14,165,233,0.08);
}
.gauge-card{
  --mark-color: var(--gauge-color, var(--cyan));
  background:var(--bg-2); border:1px solid var(--line);
  padding:14px 10px 12px; display:flex; flex-direction:column; align-items:center; gap:8px;
  position:relative;
  box-shadow:0 1px 2px rgba(0,0,0,0.03);
}
.gauge-ref{
  position:absolute; top:6px; left:8px;
  font-family:var(--font-mono); font-size:9px; color:var(--ink-faint); letter-spacing:0.06em;
}
.gauge-svg{ display:block; }
.gauge-label{ font-family:var(--font-mono); font-size:10.5px; color:var(--ink-dim); text-align:center; letter-spacing:0.02em;}
.gauge-count{ font-family:var(--font-mono); font-size:9.5px; color:var(--ink-faint); }

/* ---------- controls (ruler bar) ---------- */
.controls{ max-width:1180px; margin:36px auto 0; padding:0 24px; }
.controls-inner{
  display:flex; justify-content:space-between; align-items:center; gap:20px; flex-wrap:wrap;
  padding:0 0 14px;
  border-top:1px solid var(--line-strong);
  border-bottom:1px solid var(--line);
  position:relative;
}
.controls-inner::before{
  content:''; position:absolute; top:-1px; left:0; right:0; height:5px;
  background-image: repeating-linear-gradient(90deg, var(--line-strong) 0, var(--line-strong) 1px, transparent 1px, transparent 12px);
  background-position:top;
}
.tab-row{ display:flex; gap:2px; flex-wrap:wrap; padding-top:14px; }
.tab{
  font-family:var(--font-mono); font-size:12px; padding:9px 14px;
  border:1px solid transparent; border-bottom:2px solid transparent;
  background:transparent; color:var(--ink-dim);
  cursor:pointer; transition:all .15s ease; display:flex; align-items:center; gap:8px;
}
.tab .tab-code{ font-size:10px; color:var(--ink-faint); }
.tab:hover{ color:var(--ink); }
.tab.is-active{ color:var(--tab-color, var(--redline)); border-bottom-color:var(--tab-color, var(--redline)); }
.tab.is-active .tab-code{ color:var(--tab-color, var(--redline)); }

.search-row{ display:flex; gap:10px; padding-top:14px; }
#search-input{
  font-family:var(--font-sans); font-size:13.5px; padding:9px 14px; width:270px;
  border-radius:var(--radius); border:1px solid var(--line-strong); background:var(--panel); color:var(--ink);
}
#search-input::placeholder{ color:var(--ink-faint); }
#search-input:focus{ outline:none; border-color:var(--cyan); box-shadow:0 0 0 3px rgba(14,165,233,0.15); }
#sort-select{
  font-family:var(--font-mono); font-size:12px; padding:9px 12px;
  border-radius:var(--radius); border:1px solid var(--line-strong); background:var(--panel); color:var(--ink-dim);
}

.progress-strip{
  height:5px; overflow:hidden; display:flex; margin-top:10px;
  background:var(--panel); border:1px solid var(--line);
}
.progress-seg{ height:100%; transition:width .3s ease; }

/* ---------- timeline ---------- */
.timeline{ max-width:1180px; margin:0 auto; padding:8px 24px 60px; }
.month-heading{
  font-family:var(--font-mono); font-size:12px; letter-spacing:0.08em; color:var(--ink-faint);
  text-transform:uppercase; margin:42px 0 16px; display:flex; align-items:center; gap:12px;
}
.month-heading .sheet-no{ color:var(--redline); }
.month-heading::after{ content:''; flex:1; height:1px; background:var(--line); }
.month-heading:first-child{ margin-top:4px; }

.card-grid{ display:grid; grid-template-columns:repeat(auto-fill, minmax(300px,1fr)); gap:1px; background:var(--line); border:1px solid var(--line); }

.card{
  background:var(--bg-2);
  border-top:3px solid var(--card-color, var(--cyan));
  padding:36px 16px 14px;
  display:flex; flex-direction:column; gap:11px;
  transition: background .15s ease, box-shadow .15s ease;
  position:relative;
  box-shadow:0 1px 3px rgba(0,0,0,0.04);
}
.card:hover{ background:var(--panel); box-shadow:0 4px 12px rgba(14,165,233,0.1); }
.card.is-done{ opacity:0.55; }
.card.is-done .card-title{ text-decoration:line-through; text-decoration-color:var(--ink-faint); }

.card-top{ display:flex; justify-content:space-between; align-items:center; gap:10px; }
.card-ref{ font-family:var(--font-mono); font-size:10.5px; color:var(--ink-faint); letter-spacing:0.04em;}
.card-date{
  font-family:var(--font-mono); font-size:10.5px; color:var(--ink-dim);
  border:1px solid var(--line); padding:3px 8px;
  background:var(--bg-2);
}
.card-meta{ display:flex; align-items:baseline; gap:8px; flex-wrap:wrap; }
.card-track{
  font-family:var(--font-mono); font-size:10px; letter-spacing:0.07em; text-transform:uppercase;
  color:var(--card-color, var(--cyan));
}
.card-module{ font-size:11.5px; color:var(--ink-faint); }

.card-title{ font-family:var(--font-sans); font-weight:600; font-size:16.5px; margin:0; line-height:1.3; color:var(--ink);}

.topic-pills{ display:flex; flex-wrap:wrap; gap:6px; }
.pill{
  font-family:var(--font-mono); font-size:11px; color:var(--ink-dim); background:var(--bg-2);
  border:1px solid var(--line); padding:3px 8px;
  transition:all .15s ease;
}
.pill:hover{ background:var(--panel); border-color:var(--cyan); color:var(--cyan); }
.pill-more{ color:var(--ink-faint); border-style:dashed; }

.card-bottom{ display:flex; justify-content:space-between; align-items:center; margin-top:auto; padding-top:8px; border-top:1px dashed var(--line); }
.check-label{ display:flex; align-items:center; gap:8px; font-family:var(--font-mono); font-size:11px; color:var(--ink-faint); cursor:pointer; }
.check-label input{ position:absolute; opacity:0; width:0; height:0; }
.bracket-check{
  width:14px; height:14px; border:1px solid var(--line-strong); position:relative; flex-shrink:0;
  transition:border-color .15s ease;
}
.bracket-check::after{
  content:''; position:absolute; inset:2.5px; background:var(--card-color, var(--redline));
  opacity:0; transition:opacity .12s ease;
}
.check-label input:checked ~ .bracket-check{ border-color:var(--card-color, var(--redline)); }
.check-label input:checked ~ .bracket-check::after{ opacity:1; }
.check-label input:focus-visible ~ .bracket-check{ outline:1.5px solid var(--cyan); outline-offset:2px; }

.empty-state{
  text-align:center; padding:70px 20px; color:var(--ink-faint); font-family:var(--font-mono); font-size:13px;
  border:1px dashed var(--line);
}

/* ---------- sync panel ---------- */
.sync-panel{ border-top:1px solid var(--line-strong); background:var(--panel); }
.sync-inner{
  max-width:1180px; margin:0 auto; padding:60px 24px;
  display:grid; grid-template-columns:1.2fr 0.8fr; gap:48px; align-items:start;
}
.sync-copy h2{ font-family:var(--font-mono); font-weight:600; font-size:clamp(22px,2.6vw,28px); margin:0 0 16px; color:var(--ink); }
.sync-copy p{ color:var(--ink-dim); max-width:56ch; font-size:14.5px; }
.sync-list{ margin:18px 0 0; padding:0; list-style:none; display:flex; flex-direction:column; gap:14px; max-width:56ch; }
.sync-list li{ padding-left:22px; position:relative; color:var(--ink-dim); font-size:14px; }
.sync-list li::before{ content:'›'; position:absolute; left:0; color:var(--redline); font-family:var(--font-mono); }
.sync-list strong{ color:var(--ink); }

.sync-steps{ background:var(--bg-2); border:1px solid var(--line); padding:22px; box-shadow:0 1px 3px rgba(14,165,233,0.08); }
.sync-steps ol{ list-style:none; margin:0 0 20px; padding:0; display:flex; flex-direction:column; gap:14px; }
.sync-steps li{ display:flex; align-items:center; gap:12px; font-size:13px; color:var(--ink-dim); }
.sync-steps li span{
  font-family:var(--font-mono); font-weight:600; font-size:11px; color:var(--ink);
  border:1px solid var(--line-strong); width:20px; height:20px;
  display:flex; align-items:center; justify-content:center; flex-shrink:0;
  background:var(--bg-2);
}

/* ---------- assumptions / note ---------- */
.assumptions{ border-top:1px solid var(--line); background:var(--bg-2); }
.assumptions-inner{ max-width:820px; margin:0 auto; padding:44px 24px; }
.note{
  border:1px dashed var(--line-strong); padding:18px 20px; position:relative;
  background:var(--bg);
}
.note-label{
  font-family:var(--font-mono); font-size:10.5px; letter-spacing:0.12em; color:var(--redline);
  text-transform:uppercase; margin:0 0 10px; display:flex; align-items:center; gap:8px;
}
.note p{ color:var(--ink-dim); font-size:13.5px; line-height:1.75; margin:0; }

/* ---------- modal ---------- */
  .modal-overlay{
    position:fixed; inset:0; z-index:100;
    background:rgba(15,23,42,0.7);
    backdrop-filter:blur(4px);
    display:flex; align-items:center; justify-content:center;
    padding:24px; opacity:0; visibility:hidden;
    transition:opacity .2s ease, visibility .2s ease;
  }
  .modal-overlay:not([hidden]){ opacity:1; visibility:visible; }
  .modal{
    background:var(--panel); border:1px solid var(--line-strong);
    border-radius:var(--radius); width:100%; max-width:520px; max-height:90vh;
    overflow:auto; transform:translateY(12px); transition:transform .2s ease;
    box-shadow:0 10px 40px rgba(0,0,0,0.15);
  }
  .modal-overlay:not([hidden]) .modal{ transform:translateY(0); }
  .modal-header{
    display:flex; justify-content:space-between; align-items:center;
    padding:16px 20px; border-bottom:1px solid var(--line);
    font-family:var(--font-mono); font-size:14px; font-weight:600;
  }
  .modal-close{
    background:none; border:none; color:var(--ink-dim); font-size:22px; line-height:1;
    cursor:pointer; padding:0 4px; transition:color .15s ease;
  }
  .modal-close:hover{ color:var(--redline); }
  .modal-form{ padding:20px; display:flex; flex-direction:column; gap:16px; }
  .form-row{ display:flex; flex-direction:column; gap:6px; }
  .form-row label{
    font-family:var(--font-mono); font-size:11px; letter-spacing:0.08em;
    text-transform:uppercase; color:var(--ink-faint);
  }
  .form-row input, .form-row select, .form-row textarea{
    font-family:var(--font-sans); font-size:13.5px; padding:9px 12px;
    border-radius:var(--radius); border:1px solid var(--line-strong);
    background:var(--bg-2); color:var(--ink);
  }
  .form-row input:focus, .form-row select:focus, .form-row textarea:focus{
    outline:none; border-color:var(--cyan); box-shadow:0 0 0 3px rgba(14,165,233,0.15);
  }
  .form-row textarea{ font-family:var(--font-mono); font-size:11.5px; resize:vertical; }
  .form-actions{ display:flex; justify-content:flex-end; gap:10px; margin-top:8px; }

  /* ---------- card actions ---------- */
  .card-actions{
    display:flex; gap:6px; margin-left:auto; opacity:0;
    transition:opacity .15s ease;
  }
  .card:hover .card-actions{ opacity:1; }
  .btn-icon{
    background:transparent; border:1px solid var(--line-strong);
    color:var(--ink-dim); padding:4px 8px; border-radius:var(--radius);
    font-family:var(--font-mono); font-size:11px; cursor:pointer;
    transition:all .15s ease;
  }
  .btn-icon:hover{ border-color:var(--cyan); color:var(--cyan); }
  .btn-icon.delete:hover{ border-color:var(--redline); color:var(--redline); }

  /* ---------- drag handle ---------- */
  .card{ position:relative; }
  .card.dragging{ opacity:0.4; border-top-width:3px; }
  .card.drag-over{ border:2px dashed var(--cyan); }
  .drag-handle{
    position:absolute; top:12px; left:12px; z-index:2;
    cursor:grab; color:var(--ink-faint); padding:2px 6px;
    font-family:var(--font-mono); font-size:12px; user-select:none;
    transition:color .15s ease;
  }
  .drag-handle:hover{ color:var(--ink); }
  .drag-handle:active{ cursor:grabbing; }

  /* ---------- footer ---------- */
  .site-footer{
    border-top:1px solid var(--line);
    background:var(--panel);
  }
  .footer-inner{
    max-width:1180px; margin:0 auto; padding:20px 24px;
    display:flex; justify-content:space-between; align-items:center; gap:16px; flex-wrap:wrap;
    font-family:var(--font-mono); font-size:11px; color:var(--ink-faint);
  }
  .footer-inner span{ letter-spacing:0.03em; }

  /* ---------- responsive ---------- */
  @media (max-width: 900px){
    .hero-top{ grid-template-columns:1fr; }
    .instruments{ grid-template-columns:repeat(4,1fr); }
    .sync-inner{ grid-template-columns:1fr; }
    .title-block{ grid-template-columns:1fr 1fr 1fr; }
    .tb-cell:nth-child(3n+1){ border-left:none; }
    .tb-cell{ border-top:1px solid var(--line); }
    .tb-cell:nth-child(-n+3){ border-top:none; }
  }
  @media (max-width: 640px){
    .topbar-inner{ flex-wrap:wrap; gap:10px 16px; padding:12px 16px; }
    .topnav{ order:3; gap:16px; font-size:12px; width:100%; }
    #download-ics{ padding:8px 12px; font-size:11.5px; }
    .hero{ padding:36px 16px 20px; }
    .instruments{ grid-template-columns:1fr 1fr; }
    .title-block{ grid-template-columns:1fr 1fr; }
    .tb-cell:nth-child(2n+1){ border-left:none; }
    .tb-cell:nth-child(odd){ border-top:1px solid var(--line); }
    .tb-cell:nth-child(-n+2){ border-top:none; }
    .controls{ padding:0 16px; }
    .search-row{ width:100%; flex-wrap:wrap; }
    #search-input{ width:100%; }
    .timeline{ padding:8px 16px 50px; }
    .card-grid{ grid-template-columns:1fr; }
    .sync-inner{ padding:44px 16px; }
    .assumptions-inner{ padding:32px 16px; }
  }