/* ==========================================================================
   Dissertation Dr. Peter Oechtering — Oberflächenwellen-Gassensorik
   Design: dunkles wissenschaftliches Theme, offline-fähig (keine Web-Fonts)
   ========================================================================== */

:root{
  --bg:            #0a0f18;
  --bg-2:          #0e1622;
  --bg-3:          #131f2e;
  --panel:         #101a27;
  --panel-2:       #16222f;
  --line:          #23344a;
  --line-soft:     #1a2839;

  --tx:            #d8e3f0;
  --tx-dim:        #8fa3ba;
  --tx-faint:      #61758d;

  --acc:           #37c6f4;   /* Rayleighwelle / primär */
  --acc-2:         #ffb443;   /* Elektroden / Wärme */
  --acc-3:         #b07cff;   /* Polymer / Schicht */
  --acc-4:         #4ade80;   /* Messung / positiv */
  --acc-5:         #ff6b81;   /* Dämpfung / Warnung */

  --mono: ui-monospace, "Cascadia Mono", "JetBrains Mono", Consolas, "Liberation Mono", monospace;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --maxw: 1160px;
  --rad: 14px;
}

*{ box-sizing:border-box; }

html{ scroll-behavior:smooth; scroll-padding-top:78px; }

body{
  margin:0;
  background:
    radial-gradient(1200px 700px at 15% -8%, #16283d 0%, transparent 60%),
    radial-gradient(900px 600px at 92% 4%, #1d2036 0%, transparent 55%),
    var(--bg);
  color:var(--tx);
  font-family:var(--sans);
  font-size:16.5px;
  line-height:1.72;
  -webkit-font-smoothing:antialiased;
}

/* ---------- Typografie ---------- */
h1,h2,h3,h4{ line-height:1.22; margin:0 0 .5em; font-weight:650; letter-spacing:-.01em; }
h1{ font-size:clamp(2rem,4.4vw,3.35rem); font-weight:700; letter-spacing:-.025em; }
h2{ font-size:clamp(1.55rem,2.8vw,2.15rem); margin-top:0; }
h3{ font-size:1.2rem; color:#eaf2fb; margin-top:2.1em; }
h4{ font-size:1.02rem; color:var(--acc); text-transform:uppercase; letter-spacing:.09em;
    font-weight:650; margin-top:1.9em; font-size:.82rem; }
p{ margin:0 0 1.15em; }
a{ color:var(--acc); text-decoration:none; border-bottom:1px solid rgba(55,198,244,.3); }
a:hover{ border-bottom-color:var(--acc); }
strong{ color:#f0f6fc; font-weight:620; }
em{ color:var(--tx); }
ul,ol{ margin:0 0 1.15em; padding-left:1.35em; }
li{ margin-bottom:.42em; }
sub,sup{ font-size:.72em; }
code, .m{ font-family:var(--mono); font-size:.92em; color:var(--acc); }
.u{ font-family:var(--mono); font-size:.88em; color:var(--tx-dim); white-space:nowrap; }

/* ---------- Layout ---------- */
.wrap{ max-width:var(--maxw); margin:0 auto; padding:0 26px; }
.narrow{ max-width:800px; }
section{ padding:74px 0; border-top:1px solid var(--line-soft); }
section:first-of-type{ border-top:none; }
.sec-num{
  font-family:var(--mono); font-size:.78rem; letter-spacing:.16em;
  color:var(--acc); text-transform:uppercase; display:block; margin-bottom:.7rem;
}
.lead{ font-size:1.13rem; color:#c3d3e5; line-height:1.72; }

/* ---------- Header / Nav ---------- */
header.topbar{
  position:sticky; top:0; z-index:80;
  background:rgba(10,15,24,.88);
  backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-soft);
}
.topbar-in{ max-width:var(--maxw); margin:0 auto; padding:0 26px;
  display:flex; align-items:center; gap:18px; height:58px; }
.brand{ font-weight:700; font-size:.93rem; letter-spacing:-.01em; color:#fff;
  border:none; white-space:nowrap; }
.brand span{ color:var(--acc); font-family:var(--mono); font-weight:400; font-size:.85em; }
nav.toc{ display:flex; gap:2px; margin-left:auto; overflow-x:auto; scrollbar-width:none; }
nav.toc::-webkit-scrollbar{ display:none; }
nav.toc a{
  font-size:.82rem; color:var(--tx-dim); padding:6px 11px; border-radius:8px;
  border:none; white-space:nowrap; transition:.16s;
}
nav.toc a:hover{ color:var(--tx); background:var(--panel-2); }
nav.toc a.on{ color:var(--acc); background:rgba(55,198,244,.1); }

/* ---------- Hero ---------- */
.hero{ padding:96px 0 74px; position:relative; overflow:hidden; }
.hero-grid{ display:grid; grid-template-columns:1.15fr .85fr; gap:52px; align-items:center; }
.eyebrow{
  display:inline-flex; align-items:center; gap:9px;
  font-family:var(--mono); font-size:.74rem; letter-spacing:.15em; text-transform:uppercase;
  color:var(--acc); background:rgba(55,198,244,.08);
  border:1px solid rgba(55,198,244,.25); padding:6px 13px; border-radius:100px; margin-bottom:22px;
}
.hero h1{ margin-bottom:.55em; }
.hero h1 .hl{
  background:linear-gradient(100deg,var(--acc) 10%, var(--acc-3) 90%);
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero-sub{ font-size:1.12rem; color:#b7c9dd; max-width:56ch; }
.hero-meta{
  display:flex; flex-wrap:wrap; gap:0; margin-top:34px;
  border:1px solid var(--line); border-radius:var(--rad); overflow:hidden;
  background:rgba(16,26,39,.6);
}
.hero-meta div{ flex:1 1 150px; padding:15px 18px; border-right:1px solid var(--line-soft); }
.hero-meta div:last-child{ border-right:none; }
.hero-meta dt{ font-family:var(--mono); font-size:.68rem; letter-spacing:.13em;
  text-transform:uppercase; color:var(--tx-faint); margin-bottom:5px; }
.hero-meta dd{ margin:0; font-size:.94rem; color:#e3ecf6; font-weight:560; }
.hero-canvas{ height:420px; border-radius:var(--rad); overflow:hidden;
  border:1px solid var(--line); background:var(--bg-2); position:relative; }

/* ---------- Karten / Panels ---------- */
.panel{
  background:linear-gradient(180deg, var(--panel) 0%, var(--bg-2) 100%);
  border:1px solid var(--line); border-radius:var(--rad); padding:26px 28px;
}
.grid2{ display:grid; grid-template-columns:1fr 1fr; gap:22px; }
.grid3{ display:grid; grid-template-columns:repeat(3,1fr); gap:20px; }
.grid4{ display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }
/* Grid-Kinder dürfen nicht über die Spur hinauswachsen (sonst brechen
   die scrollbaren Tabellen das Seitenlayout auf schmalen Displays auf) */
.grid2 > *, .grid3 > *, .grid4 > *, .chart-duo > *{ min-width:0; }

.card{
  background:var(--panel); border:1px solid var(--line); border-radius:var(--rad);
  padding:22px 24px; transition:.2s;
}
.card:hover{ border-color:#31485f; }
.card h3{ margin-top:0; font-size:1.03rem; }
.card p:last-child{ margin-bottom:0; }
.card .tag{
  font-family:var(--mono); font-size:.68rem; letter-spacing:.12em; text-transform:uppercase;
  color:var(--acc-2); display:block; margin-bottom:9px;
}

.stat{ text-align:left; }
.stat .v{ font-family:var(--mono); font-size:1.75rem; font-weight:600; color:var(--acc);
  display:block; line-height:1.15; letter-spacing:-.02em; }
.stat .k{ font-size:.85rem; color:var(--tx-dim); margin-top:6px; display:block; }

/* ---------- Formeln ---------- */
.eq{
  background:var(--bg-3); border:1px solid var(--line-soft);
  border-left:3px solid var(--acc);
  border-radius:9px; padding:16px 20px; margin:1.5em 0;
  font-family:var(--mono); font-size:1rem; color:#e7f2fb;
  overflow-x:auto; display:flex; align-items:center; gap:18px;
}
.eq .body{ flex:1; line-height:2; }
.eq .num{ font-size:.78rem; color:var(--tx-faint); white-space:nowrap; }
.eq .cap{ font-size:.8rem; color:var(--tx-dim); font-family:var(--sans);
  margin-top:.4em; display:block; line-height:1.55; }
.frac{ display:inline-flex; flex-direction:column; vertical-align:middle;
  text-align:center; margin:0 .28em; }
.frac > span:first-child{ border-bottom:1px solid var(--tx-dim); padding:0 .34em .09em; }
.frac > span:last-child{ padding:.09em .34em 0; }
.sq{ border-top:1px solid currentColor; padding:0 .2em; }

/* ---------- Tabellen ---------- */
.tbl-wrap{ overflow-x:auto; margin:1.6em 0; border:1px solid var(--line);
  border-radius:var(--rad); background:var(--panel); max-width:100%; }
table{ width:100%; border-collapse:collapse; font-size:.9rem; min-width:520px; }
caption{ caption-side:top; text-align:left; padding:15px 20px 12px;
  font-size:.83rem; color:var(--tx-dim); border-bottom:1px solid var(--line-soft); }
caption b{ color:var(--acc); font-family:var(--mono); font-weight:600;
  font-size:.78rem; letter-spacing:.09em; text-transform:uppercase; margin-right:.6em; }
th{ text-align:left; padding:11px 16px; font-weight:600; font-size:.78rem;
  letter-spacing:.06em; text-transform:uppercase; color:var(--tx-faint);
  border-bottom:1px solid var(--line); white-space:nowrap; }
td{ padding:10px 16px; border-bottom:1px solid var(--line-soft); vertical-align:top; }
tbody tr:last-child td{ border-bottom:none; }
tbody tr:hover{ background:rgba(55,198,244,.035); }
td.n, th.n{ text-align:right; font-family:var(--mono); font-size:.87rem; }
td.hi{ color:var(--acc); }

/* ---------- Visualisierungs-Module ---------- */
.viz{
  margin:2.4em 0; border:1px solid var(--line); border-radius:var(--rad);
  background:var(--bg-2); overflow:hidden;
}
.viz-head{
  padding:15px 22px; border-bottom:1px solid var(--line-soft);
  display:flex; align-items:center; gap:14px; flex-wrap:wrap;
  background:rgba(19,31,46,.55);
}
.viz-head .t{ font-weight:620; font-size:.95rem; color:#eaf2fb; }
.viz-head .badge{
  font-family:var(--mono); font-size:.65rem; letter-spacing:.13em; text-transform:uppercase;
  color:var(--acc-3); border:1px solid rgba(176,124,255,.32);
  background:rgba(176,124,255,.09); padding:3px 9px; border-radius:20px;
}
.viz-head .badge.b2{ color:var(--acc-4); border-color:rgba(74,222,128,.3); background:rgba(74,222,128,.08); }
.viz-stage{ position:relative; height:430px; background:
  radial-gradient(700px 420px at 50% 30%, #14202e 0%, #0b1119 78%); }
.viz-stage canvas{ display:block; width:100%; height:100%; }
.viz-stage.short{ height:330px; }
.viz-stage.tall{ height:500px; }
.viz-ctl{
  padding:15px 22px; border-top:1px solid var(--line-soft);
  display:flex; flex-wrap:wrap; gap:18px 26px; align-items:center;
  background:rgba(13,20,31,.6);
}
.ctl{ display:flex; align-items:center; gap:10px; font-size:.83rem; color:var(--tx-dim); }
.ctl label{ white-space:nowrap; }
.ctl input[type=range]{ width:118px; accent-color:var(--acc); cursor:pointer; }
.ctl output{ font-family:var(--mono); font-size:.8rem; color:var(--acc);
  min-width:62px; display:inline-block; }
.seg{ display:inline-flex; border:1px solid var(--line); border-radius:9px; overflow:hidden; }
.seg button{
  background:transparent; border:none; color:var(--tx-dim); font:inherit;
  font-size:.79rem; padding:6px 13px; cursor:pointer; transition:.15s;
  border-right:1px solid var(--line-soft);
}
.seg button:last-child{ border-right:none; }
.seg button:hover{ background:var(--panel-2); color:var(--tx); }
.seg button.on{ background:rgba(55,198,244,.14); color:var(--acc); }
.chk{ display:inline-flex; align-items:center; gap:7px; cursor:pointer; user-select:none; }
.chk input{ accent-color:var(--acc); cursor:pointer; }
.viz-note{
  padding:13px 22px; font-size:.82rem; color:var(--tx-faint);
  border-top:1px solid var(--line-soft); background:rgba(10,15,24,.5); line-height:1.6;
}
.viz-legend{ display:flex; flex-wrap:wrap; gap:16px; font-size:.78rem; color:var(--tx-dim); }
.viz-legend i{ width:11px; height:11px; border-radius:3px; display:inline-block;
  margin-right:6px; vertical-align:-1px; }

.chart-stage{ position:relative; height:330px; padding:8px 12px 4px; }
.chart-stage canvas{ display:block; width:100%; height:100%; }
.chart-duo{ display:grid; grid-template-columns:1fr 1fr; }
.chart-duo > div{ border-right:1px solid var(--line-soft); }
.chart-duo > div:last-child{ border-right:none; }

/* ---------- Hinweise ---------- */
.note{
  border-left:3px solid var(--acc-2); background:rgba(255,180,67,.055);
  padding:15px 20px; border-radius:0 9px 9px 0; margin:1.6em 0; font-size:.93rem;
  color:#d5dfea;
}
.note.info{ border-left-color:var(--acc); background:rgba(55,198,244,.05); }
.note.key{ border-left-color:var(--acc-3); background:rgba(176,124,255,.06); }
.note b{ color:#fff; }
.note p:last-child{ margin-bottom:0; }

/* ---------- Erratum / Befunde ---------- */
.sev{ display:inline-flex; align-items:center; gap:7px; white-space:nowrap;
  font-family:var(--mono); font-size:.68rem; letter-spacing:.1em; text-transform:uppercase; }
.sev i{ width:8px; height:8px; border-radius:50%; display:inline-block; flex:none; }
.sev.s1{ color:var(--acc-5); } .sev.s1 i{ background:var(--acc-5); box-shadow:0 0 8px var(--acc-5); }
.sev.s2{ color:var(--acc-2); } .sev.s2 i{ background:var(--acc-2); }
.sev.s3{ color:var(--tx-faint); } .sev.s3 i{ background:var(--tx-faint); }
.ok{ color:var(--acc-4); font-family:var(--mono); font-weight:600; }
td .was{ color:var(--acc-5); } td .soll{ color:var(--acc-4); }
.q{ font-family:var(--mono); font-size:.85rem; color:#cfe0f0;
  background:var(--bg-3); border-radius:6px; padding:2px 8px; display:inline-block; }

.pillrow{ display:flex; flex-wrap:wrap; gap:8px; margin:1.2em 0; }
.pill{
  font-size:.78rem; padding:5px 13px; border-radius:100px;
  border:1px solid var(--line); background:var(--panel-2); color:var(--tx-dim);
  font-family:var(--mono);
}
.pill b{ color:var(--acc); font-weight:600; }

/* ---------- Molekül-SVG ---------- */
.mol-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:18px; margin:1.8em 0; }
.mol{ background:var(--panel); border:1px solid var(--line); border-radius:var(--rad);
  padding:20px; text-align:center; }
.mol svg{ width:100%; height:132px; }
.mol .nm{ font-weight:620; font-size:.93rem; margin-top:12px; color:#eaf2fb; }
.mol .sub{ font-size:.79rem; color:var(--tx-faint); margin-top:3px; line-height:1.5; }

/* ---------- Timeline / Ablauf ---------- */
.flow{ display:grid; grid-template-columns:repeat(4,1fr); gap:0; margin:2em 0;
  border:1px solid var(--line); border-radius:var(--rad); overflow:hidden; }
.flow > div{ padding:20px 22px; border-right:1px solid var(--line-soft);
  background:var(--panel); }
.flow > div:last-child{ border-right:none; }
.flow .st{ font-family:var(--mono); font-size:.7rem; color:var(--acc);
  letter-spacing:.13em; margin-bottom:8px; }
.flow h4{ margin:0 0 7px; font-size:.95rem; color:#eaf2fb; text-transform:none;
  letter-spacing:0; }
.flow p{ font-size:.85rem; color:var(--tx-dim); margin:0; line-height:1.6; }

/* ---------- Footer ---------- */
footer{ border-top:1px solid var(--line); padding:52px 0 68px; margin-top:24px;
  background:rgba(8,12,20,.6); }
footer .cols{ display:grid; grid-template-columns:1.6fr 1fr 1fr; gap:40px; }
footer h4{ margin-top:0; }
footer p, footer li{ font-size:.87rem; color:var(--tx-dim); }
footer ul{ list-style:none; padding:0; }
.fine{ margin-top:38px; padding-top:22px; border-top:1px solid var(--line-soft);
  font-size:.79rem; color:var(--tx-faint); }

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .hero-grid{ grid-template-columns:1fr; gap:34px; }
  .hero-canvas{ height:320px; }
  .grid3, .grid4, .mol-grid{ grid-template-columns:1fr 1fr; }
  .flow{ grid-template-columns:1fr 1fr; }
  .flow > div:nth-child(2){ border-right:none; }
  footer .cols{ grid-template-columns:1fr 1fr; }
}
@media (max-width:720px){
  body{ font-size:16px; }
  section{ padding:54px 0; }
  .wrap{ padding:0 18px; }
  .topbar-in{ padding:0 18px; }
  nav.toc{ display:none; }
  .grid2, .grid3, .grid4, .mol-grid, .chart-duo{ grid-template-columns:1fr; }
  .chart-duo > div{ border-right:none; border-bottom:1px solid var(--line-soft); }
  .flow{ grid-template-columns:1fr; }
  .flow > div{ border-right:none; border-bottom:1px solid var(--line-soft); }
  .viz-stage{ height:330px; }
  .viz-stage.tall{ height:380px; }
  footer .cols{ grid-template-columns:1fr; }
  .hero-meta div{ flex-basis:50%; }
}

/* Print */
@media print{
  body{ background:#fff; color:#111; }
  header.topbar, .viz-ctl, nav.toc{ display:none; }
}