:root{
  --ink: #0b1320;
  --muted: rgba(11,19,32,0.65);

  --blue-line: rgba(36, 92, 200, 0.18);
  --blue-grid: rgba(36, 92, 200, 0.08);
  --red-margin: rgba(210, 40, 40, 0.55);
  --rule: rgba(11,19,32,0.16);

  --radius: 10px;

  /* move layout left: wider max + smaller padding + smaller gap */
  --max: 1400px;
  --pad: 12px;
  --side: 200px;
  --gap: 16px;

  /* red line between nav and main, relative to centered layout */
  --margin-x: calc(50% - (var(--max) / 2) + var(--pad) + var(--side) + (var(--gap) / 2));
}

*{ box-sizing: border-box; }

body{
  margin: 0;
  color: var(--ink);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono","Courier New", monospace;
  background: #fff;
}

.paper{
  min-height: 100vh;
  position: relative;
  background:
    repeating-linear-gradient(
      to right,
      transparent 0,
      transparent 79px,
      var(--blue-grid) 79px,
      var(--blue-grid) 80px
    ),
    repeating-linear-gradient(
      to bottom,
      transparent 0,
      transparent 27px,
      var(--blue-line) 27px,
      var(--blue-line) 28px
    );
}

.paper::before{
  content:"";
  position: fixed;
  top: 0;
  bottom: 0;
  left: var(--margin-x);
  width: 2px;
  background: var(--red-margin);
  pointer-events: none;
  z-index: 2;
}

.layout{
  max-width: var(--max);
  margin: 0 auto;
  padding: 28px var(--pad) 28px;
  display: grid;
  grid-template-columns: var(--side) 1fr;
  column-gap: var(--gap);
}

.side{
  position: sticky;
  top: 14px;
  align-self: start;
  z-index: 3;
}

/* margin-style nav */
.nav{
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding-top: 92px;
}

.tab{
  appearance: none;
  border: 0;
  background: transparent;
  color: rgba(11,19,32,0.78);
  padding: 2px 0;
  cursor: pointer;
  font-weight: 900;
  letter-spacing: 0.2px;
  text-align: left;
  position: relative;
  transition: color .15s ease, transform .08s ease;
}

.tab::after{
  content:"";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 100%;
  height: 1px;
  background: rgba(11,19,32,0.22);
}

.tab::before{
  content:"";
  position: absolute;
  left: -10px;
  right: -10px;
  top: 50%;
  height: 1.25em;
  transform: translateY(-50%);
  background: rgba(255,235,59,0.0);
  border-radius: 6px;
  z-index: -1;
  transition: background .15s ease;
}

.tab:hover{
  color: rgba(11,19,32,0.95);
  transform: translateY(-1px);
}
.tab:hover::before{ background: rgba(255,235,59,0.22); }

.tab.is-active{ color: rgba(11,19,32,0.98); }
.tab.is-active::before{ background: rgba(36,92,200,0.12); }
.tab.is-active::after{ height: 2px; background: rgba(36,92,200,0.55); }

.tab:focus-visible{
  outline: 2px solid rgba(36,92,200,0.35);
  outline-offset: 4px;
  border-radius: 6px;
}

.main{ min-width: 0; }

/* sticky header stays visible, but transparent */
.header{
  position: sticky;
  top: 0;
  z-index: 5;
  background: transparent;
  padding: 6px 0 10px;
}

.title-wrap{
  position: relative;
  height: 86px;
  display: grid;
  place-items: center;
}

.title-waves{
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0.45;
  pointer-events: none;
}

.title{
  position: relative;
  z-index: 1;
  text-align: center;
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 900;
  letter-spacing: 0.6px;
  text-transform: lowercase;
}

.rule{
  height: 1px;
  background: var(--rule);
  margin: 14px 0;
}

.wave-panel{
  border: 1px solid rgba(11,19,32,0.14);
  background: rgba(255,255,255,0.72);
  border-radius: var(--radius);
  padding: 12px 12px 8px;
  backdrop-filter: blur(6px);
}

.waves{
  width: 100%;
  height: 210px; /* bigger */
  display: block;
  border-radius: calc(var(--radius) - 2px);
}

.wave-meta{
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 4px 0;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

.content{ padding: 10px 0 0; }

.panel{ display: none; }
.panel.is-active{ display: block; }

h1,h2{
  margin: 18px 0 10px;
  letter-spacing: 0.2px;
}
p,li{
  color: var(--muted);
  line-height: 1.75;
  font-size: 14px;
}

.contact{
  margin-top: 10px;
  padding: 12px;
  border: 1px dashed rgba(11,19,32,0.20);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.65);
}

.footer{
  margin-top: 26px;
  font-size: 12px;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}

/* Mobile fallback */
@media (max-width: 860px){
  :root{
    --max: 980px;
    --side: 1fr;
    --gap: 12px;
    --margin-x: 36px;
  }
  .layout{ grid-template-columns: 1fr; row-gap: 14px; }
  .side{ position: relative; top: auto; }
  .nav{ padding-top: 0; flex-direction: row; flex-wrap: wrap; gap: 14px 16px; }
}