/* Alaa Alsleman, Website.
   Gestaltungsprinzip: technische Zeichnung. Jede Farbe steht für genau einen Energieträger
   und wird überall gleich verwendet (Graph, Quartier, Diagramme).
   Strom = Blau, Sonne = Gelb, Wärme = Rot, Wasserstoff = Türkis, Mobilität = Violett. */

:root {
  --paper: #F3F5F4;
  --surface: #FFFFFF;
  --ground: #E7ECE9;
  --ink: #13212C;
  --ink-2: #43515B;
  --muted: #6B7983;
  --line: #D3DADE;
  --grid: #E6EBEE;

  --el: #2A6EBB;      --el-soft: #DCE8F5;   --el-ink: #1F5A9E;
  --sun: #E0A21B;     --sun-soft: #F7E3B0;
  --heat: #CF4A2A;    --heat-soft: #F6DCD3;
  --h2: #14998A;      --h2-soft: #D3EEEA;
  --mob: #7A52C7;     --mob-soft: #E7DFF6;
  --grey-mark: #8A97A1;

  --good: #2E7D5B;
  --radius: 6px;
  --max: 1180px;
  --gutter: 16px;

  --f-body: 'Barlow', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
  --f-cond: 'Barlow Condensed', 'Arial Narrow', 'Barlow', sans-serif;
}

*,*::before,*::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 76px; }
body {
  margin: 0;
  overflow-x: hidden;
  font-family: var(--f-body);
  font-size: 18px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--el-ink); text-decoration-thickness: 1px; text-underline-offset: 3px; }
h1, h2, h3 { font-family: var(--f-cond); font-weight: 600; line-height: 1.05; margin: 0 0 .5em; letter-spacing: 0; }
h1 { font-size: clamp(2.6rem, 6.2vw, 4.6rem); font-weight: 700; max-width: 14ch; }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: 1.4rem; }
p { margin: 0 0 1em; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 0 var(--gutter); }
@media (min-width: 720px) { .wrap { padding: 0 32px; } }

.skip { position: absolute; left: -999px; top: 8px; background: var(--ink); color: #fff; padding: 8px 12px; z-index: 100; }
.skip:focus { left: 8px; }
:focus-visible { outline: 3px solid var(--el); outline-offset: 2px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 13px 22px; border-radius: 4px; font: 600 1rem/1.2 var(--f-body);
  text-decoration: none; border: 1.5px solid transparent; cursor: pointer;
  transition: background .15s ease, border-color .15s ease;
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: var(--el-ink); }
.btn-secondary { background: transparent; color: var(--ink); border-color: var(--ink); }
.btn-secondary:hover { background: var(--surface); }
.btn-small { padding: 9px 16px; font-size: .95rem; }
.cta-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 1.75rem; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(243,245,244,.94); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.nav-wrap { display: flex; align-items: center; justify-content: space-between; min-height: 64px; gap: 16px; }
.brand { display: grid; grid-template-columns: auto 1fr; column-gap: 10px; align-items: center; text-decoration: none; color: var(--ink); }
.brand-mark { grid-row: 1 / span 2; display: grid; grid-auto-flow: column; gap: 3px; height: 30px; }
.brand-mark i { width: 4px; border-radius: 1px; background: var(--el); }
.brand-mark i:nth-child(2) { background: var(--heat); margin-top: 8px; }
.brand-mark i:nth-child(3) { background: var(--mob); margin-top: 14px; }
.brand-name { font: 700 1.2rem/1 var(--f-cond); }
.brand-sub { font-size: .8rem; color: var(--muted); line-height: 1.2; }
.nav { display: none; align-items: center; gap: 22px; }
.nav a { color: var(--ink); text-decoration: none; font-weight: 500; font-size: .98rem; }
.nav a:not(.btn):hover { color: var(--el-ink); }
.nav a.btn-primary { color: #fff; }
.nav-toggle { display: inline-flex; flex-direction: column; gap: 5px; background: none; border: 0; padding: 10px; cursor: pointer; }
.nav-toggle span { width: 22px; height: 2px; background: var(--ink); display: block; transition: transform .2s, opacity .2s; }
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.nav.open { display: flex; flex-direction: column; align-items: stretch; position: absolute; left: 0; right: 0; top: 64px; background: var(--surface); border-bottom: 1px solid var(--line); padding: 16px var(--gutter) 20px; gap: 14px; }
@media (min-width: 980px) {
  .nav { display: flex !important; position: static; flex-direction: row; background: none; border: 0; padding: 0; }
  .nav-toggle { display: none; }
}

/* Zeichenblatt: weiße Fläche mit Schriftfeld wie in einer technischen Zeichnung */
.sheet { margin: 0; background: var(--surface); border: 1px solid var(--ink); border-radius: 2px; position: relative; }
.titleblock { display: flex; flex-wrap: wrap; border-top: 1px solid var(--ink); font-size: .82rem; color: var(--ink-2); }
.titleblock span { padding: 6px 12px; border-right: 1px solid var(--line); display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.titleblock span:last-child { border-right: 0; margin-left: auto; }
.titleblock b { font: 600 .78rem/1 var(--f-cond); color: var(--muted); margin-right: 4px; letter-spacing: .02em; }
.sw { display: inline-block; width: 14px; height: 3px; background: var(--c); border-radius: 2px; margin-left: 4px; }

/* Hero */
.hero { padding: 44px 0 0; }
.hero-top { display: grid; gap: 20px 56px; align-items: end; }
.hero-top > * { min-width: 0; }
@media (min-width: 980px) { .hero-top { grid-template-columns: 1.15fr 1fr; } .hero { padding-top: 64px; } }
.hero-role { font: 600 1.15rem/1.3 var(--f-cond); color: var(--ink-2); margin-bottom: 1rem; }
.hero h1 { margin-bottom: 0; }
.lead { font-size: 1.2rem; color: var(--ink-2); max-width: 44ch; }
.audience { font-size: 1rem; color: var(--muted); max-width: 46ch; margin: 0; }
.hero-q { margin-top: 40px; }
.q-intro { color: var(--ink-2); margin: 0 0 12px; }
.q-intro b { color: var(--ink); font: 600 1.2rem/1.3 var(--f-cond); margin-right: 4px; }

/* Grafiken: auf kleinen Bildschirmen seitlich scrollbar statt unlesbar klein */
.scroll-x { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.scroll-x:focus-visible { outline-offset: -3px; }
.esg { min-width: 560px; }
.swipe-hint { font-size: .82rem; color: var(--muted); margin: 0; padding: 4px 12px 8px; }
@media (min-width: 900px) { .swipe-hint { display: none; } }
.qsvg { min-width: 880px; }

/* Energiesystemgraph */
.esg { width: 100%; height: auto; display: block; padding: 10px 8px 4px; }
.esg text { font-family: var(--f-cond); font-size: 15px; font-weight: 500; fill: var(--ink); }
.esg .bus text { font-size: 14px; font-weight: 600; fill: var(--ink-2); }
.esg .type { font-family: var(--f-body); font-size: 11px; font-weight: 400; fill: var(--muted); }
.esg .node > rect:first-child { fill: var(--surface); stroke: var(--ink); stroke-width: 1.4; }
.esg .node.sto > rect:first-child { fill: var(--paper); }
.esg .cnv-mark { stroke: var(--ink); stroke-width: 1.4; }
.esg .flow { fill: none; stroke-width: 2; stroke-dasharray: 5 5; }
.esg .flow.el { stroke: var(--el); }
.esg .flow.heat { stroke: var(--heat); }
.esg .flow.h2 { stroke: var(--h2); }
.esg .flow.mob { stroke: var(--mob); }

@keyframes flow { to { stroke-dashoffset: -20; } }
@keyframes flowrev { to { stroke-dashoffset: 20; } }
.esg .flow { animation: flow 1.4s linear infinite; }


.stations { display: flex; flex-wrap: wrap; align-items: baseline; gap: 6px 28px; padding-top: 28px; padding-bottom: 28px; margin-top: 40px; border-top: 1px solid var(--line); }
.stations p { margin: 0; color: var(--muted); font-size: .95rem; }
.stations ul { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px 28px; }
.stations li { font: 600 1.25rem/1.2 var(--f-cond); color: var(--ink-2); }

/* Abschnitte */
.section { padding: 64px 0; }
@media (min-width: 980px) { .section { padding: 96px 0; } }
.section-head { max-width: 62ch; margin-bottom: 36px; }
.section-head p { color: var(--ink-2); font-size: 1.1rem; margin: 0; }

/* Schwerpunkte: Text mit Belegen links, Abbildung rechts */
.ledger { border-top: 2px solid var(--ink); }
.ledger-row { display: grid; gap: 22px 48px; padding: 34px 0 34px 18px; border-bottom: 1px solid var(--line); position: relative; }
.ledger-row > * { min-width: 0; }
.ledger-row::before { content: ""; position: absolute; left: 0; top: 38px; width: 4px; height: 28px; background: var(--c); border-radius: 2px; }
.ledger-row h3 { font-size: 1.7rem; margin: 0 0 10px; }
.ledger-what p { margin: 0 0 16px; color: var(--ink-2); }
.proof { list-style: none; margin: 0; padding: 0; font-size: .95rem; color: var(--ink-2); }
.proof li { padding: 0 0 8px; }
.proof b { display: block; font: 600 1rem/1.25 var(--f-cond); color: var(--ink); }
.ledger-fig svg { width: 100%; height: auto; display: block; padding: 10px 10px 4px; }
.ledger-fig svg text { font-family: var(--f-body); font-size: 12px; fill: var(--muted); }
.ledger-fig svg .lbl { fill: var(--ink); font-size: 13px; font-weight: 500; }
.ledger-fig svg .val { fill: var(--ink-2); font-size: 12px; }
.ledger-fig .esg text { font-family: var(--f-cond); font-size: 15px; font-weight: 500; fill: var(--ink); }
.ledger-fig .esg .bus text { font-size: 14px; font-weight: 600; fill: var(--ink-2); }
.ledger-fig .esg .type { font-family: var(--f-body); font-size: 11px; font-weight: 400; fill: var(--muted); }
@media (min-width: 980px) {
  .ledger-row { grid-template-columns: 1fr 1.05fr; align-items: start; }
}

/* Quartier */
.quartier { overflow: hidden; }
.qsvg { width: 100%; height: auto; display: block; }
.q-stroke { stroke: var(--ink); stroke-width: 1.6; stroke-linejoin: round; }
.q-stroke.pv path, .pv path { fill: var(--sun-soft); stroke: var(--ink); stroke-width: 1.4; }
.q-label { font: 600 16px var(--f-cond); fill: var(--ink); }
.q-small { font: 500 13px var(--f-cond); fill: var(--muted); }
.q-line { fill: none; stroke-width: 3; stroke-dasharray: 8 6; animation: qflow 1.6s linear infinite; }
@keyframes qflow { to { stroke-dashoffset: -28; } }
.q-line.el { stroke: var(--el); }
.q-line.heat { stroke: var(--heat); }
.q-drop { fill: none; stroke-width: 2; }
.q-drop.el { stroke: var(--el); }
.q-drop.heat { stroke: var(--heat); }
.rotor { transform-box: view-box; transform-origin: 90px 197px; animation: spin 9s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.q-el { transition: opacity .2s ease; cursor: pointer; }
.quartier.has-focus .q-el:not(.is-on) { opacity: .22; }

.q-list { list-style: none; margin: 24px 0 0; padding: 0; display: grid; gap: 8px; }
@media (min-width: 720px) { .q-list { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1100px) { .q-list { grid-template-columns: repeat(4, 1fr); } }
.q-list button {
  width: 100%; height: 100%; text-align: left; font: inherit; color: var(--ink);
  background: var(--paper); border: 1px solid var(--line); border-left: 4px solid var(--c);
  border-radius: 2px; padding: 12px 14px; cursor: pointer; transition: background .15s, border-color .15s;
}
.q-list button b { display: block; font: 600 1.15rem/1.2 var(--f-cond); margin-bottom: 4px; }
.q-list button span { display: block; font-size: .92rem; color: var(--ink-2); line-height: 1.45; }
.q-list button:hover, .q-list button[aria-pressed="true"] { background: var(--surface); border-color: var(--ink); border-left-color: var(--c); }

/* Daten und Prognose */
.pipeline { list-style: none; margin: 0 0 36px; padding: 0; display: grid; gap: 0; counter-reset: p; border: 1px solid var(--ink); background: var(--surface); }
.pipeline li { padding: 16px 18px; border-bottom: 1px solid var(--line); position: relative; counter-increment: p; }
.pipeline li:last-child { border-bottom: 0; }
.pipeline b { display: block; font: 600 1.3rem/1.1 var(--f-cond); margin-bottom: 4px; }
.pipeline b::before { content: counter(p) "  "; color: var(--muted); font-weight: 500; }
.pipeline span { font-size: .95rem; color: var(--ink-2); }
@media (min-width: 880px) {
  .pipeline { grid-template-columns: repeat(4, 1fr); }
  .pipeline li { border-bottom: 0; border-right: 1px solid var(--line); }
  .pipeline li:last-child { border-right: 0; }
  .pipeline li:not(:last-child)::after {
    content: ""; position: absolute; right: -7px; top: 50%; width: 12px; height: 12px; margin-top: -6px;
    background: var(--surface); border-top: 1px solid var(--ink); border-right: 1px solid var(--ink); transform: rotate(45deg); z-index: 1;
  }
}

.charts { display: grid; gap: 24px; }
@media (min-width: 980px) { .charts { grid-template-columns: 1.25fr 1fr; } }
.chart { padding: 18px 18px 12px; min-width: 0; }
.chart-title h3 { font-size: 1.35rem; margin-bottom: .25em; }
.chart-title p { font-size: .92rem; color: var(--ink-2); margin: 0 0 10px; }
.legend { list-style: none; margin: 0 0 8px; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 18px; font-size: .88rem; color: var(--ink-2); }
.legend li { display: flex; align-items: center; gap: 7px; }
.lg-line { width: 18px; height: 2px; background: var(--c); border-radius: 1px; }
.lg-band { width: 18px; height: 10px; background: var(--el-soft); border-radius: 2px; }
.lg-box { width: 12px; height: 12px; background: var(--c); border-radius: 2px; }
.plot svg { width: 100%; height: auto; display: block; overflow: visible; }
.plot text { font-family: var(--f-body); font-size: 12px; fill: var(--muted); }
.plot .lbl { fill: var(--ink); font-size: 13px; }
.plot .val { fill: var(--ink-2); font-size: 12px; }
.note { font-size: .8rem; color: var(--muted); margin: 8px 0 0; }

.tip {
  position: fixed; z-index: 80; pointer-events: none; background: var(--ink); color: #fff;
  font-size: .85rem; line-height: 1.35; padding: 7px 10px; border-radius: 3px; max-width: 240px;
  box-shadow: 0 4px 14px rgba(19,33,44,.18);
}
.tip b { font-weight: 600; display: block; }

.data-proof { margin-top: 36px; }
.data-proof h3 { font-size: 1.5rem; }
.data-proof ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 0 32px; }
@media (min-width: 880px) { .data-proof ul { grid-template-columns: 1fr 1fr; } }
.data-proof li { padding: 12px 0; border-top: 1px solid var(--line); color: var(--ink-2); font-size: .97rem; }
.data-proof li b { color: var(--ink); font-weight: 600; }

/* Projekte */
.projects { display: grid; gap: 0 40px; border-top: 2px solid var(--ink); }
@media (min-width: 880px) { .projects { grid-template-columns: 1fr 1fr; } }
.project { padding: 24px 0 24px 18px; border-bottom: 1px solid var(--line); position: relative; }
.project::before { content: ""; position: absolute; left: 0; top: 28px; width: 4px; height: 24px; background: var(--c); border-radius: 2px; }
.project h3 { font-size: 1.5rem; margin-bottom: .35em; }
.project p { color: var(--ink-2); font-size: .98rem; }
.project p:last-child { margin-bottom: 0; }
.p-ctx { font: 500 1rem/1.2 var(--f-cond); color: var(--muted) !important; margin-bottom: 6px; }

/* Werdegang */
.cv-sec { background: var(--surface); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.cv-intro { display: grid; grid-template-columns: auto 1fr; gap: 20px; align-items: start; max-width: 74ch; margin-bottom: 40px; }
.cv-intro img { width: 96px; height: 96px; border-radius: 50%; object-fit: cover; border: 1px solid var(--line); }
.cv-intro p { color: var(--ink-2); margin: 0; }
.cv-grid { display: grid; gap: 24px 56px; }
@media (min-width: 980px) { .cv-grid { grid-template-columns: 1.1fr 1fr; } }
.cv-h { font-size: 1.3rem; margin: 0 0 12px; padding-bottom: 6px; border-bottom: 2px solid var(--ink); }
.cv-grid > div > .cv-h:not(:first-child) { margin-top: 32px; }
.timeline { list-style: none; margin: 0; padding: 0; }
.timeline li { display: grid; grid-template-columns: 96px 1fr; gap: 14px; padding: 12px 0; border-bottom: 1px solid var(--line); }
.timeline .when { font: 500 1rem/1.4 var(--f-cond); color: var(--muted); }
.timeline b { display: block; font-weight: 600; }
.timeline span:not(.when) { color: var(--ink-2); font-size: .95rem; }
.plain { margin: 0; padding-left: 18px; color: var(--ink-2); font-size: .97rem; }
.plain li { margin-bottom: 6px; }
.plain-p { color: var(--ink-2); font-size: .97rem; margin: 0; }
.tools { display: grid; grid-template-columns: 110px 1fr; gap: 6px 14px; margin: 0; font-size: .97rem; }
.tools dt { font: 600 1rem/1.4 var(--f-cond); color: var(--muted); }
.tools dd { margin: 0; color: var(--ink-2); }

/* Zusammenarbeit */
.steps { list-style: none; counter-reset: s; margin: 0; padding: 0; display: grid; gap: 18px; }
@media (min-width: 880px) { .steps { grid-template-columns: repeat(3, 1fr); gap: 32px; } }
.steps li { counter-increment: s; border-top: 2px solid var(--ink); padding-top: 14px; }
.steps h3::before { content: counter(s) "  "; color: var(--muted); font-weight: 500; }
.steps p { color: var(--ink-2); margin: 0; }

/* Kontakt */
.contact { background: var(--ink); color: #fff; }
.contact h2 { color: #fff; }
.contact-grid { display: grid; gap: 40px; }
.contact-grid > * { min-width: 0; }
@media (min-width: 980px) { .contact-grid { grid-template-columns: 1fr 1.1fr; gap: 64px; } }
.contact-text p { color: rgba(255,255,255,.8); }
.contact-list { display: grid; grid-template-columns: 90px 1fr; gap: 10px 12px; margin: 1.5rem 0 0; }
.contact-list dt { color: rgba(255,255,255,.6); font-size: .92rem; }
.contact-list dd { margin: 0; overflow-wrap: anywhere; }
.contact-list a { color: #fff; }
.contact-form { background: var(--surface); color: var(--ink); border-radius: 2px; padding: 26px; }
.field { margin-bottom: 16px; }
.field label { display: block; font-size: .95rem; font-weight: 500; margin-bottom: 6px; }
.field input, .field select, .field textarea {
  width: 100%; font: inherit; padding: 11px 13px; border: 1px solid var(--line); border-radius: 3px; background: var(--paper); color: var(--ink);
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--el); background: var(--surface); }
.field.check { display: grid; grid-template-columns: auto 1fr; gap: 10px; align-items: start; font-size: .92rem; }
.field.check input { width: 18px; height: 18px; margin-top: 3px; }
.field.check label { font-weight: 400; margin: 0; color: var(--ink-2); }
.hp { position: absolute; left: -9999px; }
.form-status { margin-top: 12px; font-size: .95rem; }

/* Footer */
.site-footer { padding: 26px 0; font-size: .92rem; color: var(--muted); }
.footer-grid { display: flex; flex-wrap: wrap; gap: 12px 24px; justify-content: space-between; align-items: center; }
.site-footer p { margin: 0; }
.site-footer nav { display: flex; gap: 18px; }
.site-footer a { color: var(--ink-2); text-decoration: none; }
.site-footer a:hover { color: var(--el-ink); }

/* Rechtliche Seiten */
.legal { padding: 56px 0 80px; max-width: 760px; }
.legal h1 { font-size: 2.6rem; }
.legal h2 { font-size: 1.6rem; margin-top: 2rem; }
.legal p, .legal li { color: var(--ink-2); font-size: 1rem; }
.legal .placeholder { background: #FFF4D6; border: 1px dashed #D9A400; padding: 2px 6px; border-radius: 4px; color: #6B5300; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .esg .flow, .q-line, .rotor { animation: none; }
}

/* Schwerpunkte als Reiter */
.tabs { display: flex; gap: 0; overflow-x: auto; border-bottom: 1px solid var(--line); margin-top: -2px; scrollbar-width: thin; }
.tabs [role="tab"] {
  flex: 1 0 auto; font: 600 1.15rem/1.2 var(--f-cond); color: var(--ink-2); background: none;
  border: 0; border-bottom: 4px solid transparent; padding: 16px 18px 12px; cursor: pointer; text-align: left; white-space: nowrap;
}
.tabs [role="tab"]::before { content: ""; display: inline-block; width: 10px; height: 10px; border-radius: 2px; background: var(--c); margin-right: 8px; vertical-align: 1px; }
.tabs [role="tab"]:hover { color: var(--ink); background: var(--surface); }
.tabs [role="tab"][aria-selected="true"] { color: var(--ink); border-bottom-color: var(--c); background: var(--surface); }
.has-tabs .ledger-row[hidden] { display: none; }
.has-tabs .ledger-row { border-bottom: 0; }