* {
  box-sizing: border-box;
}

:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --text: #17202a;
  --muted: #6b7785;
  --line: #d9e0e7;
  --primary: #1f3a5f;
  --primary-dark: #162a45;
  --yellow: #f3c74d;
  --yellow-soft: #fff4c9;
  --yellow-dark: #765a00;
  --blue: #2f6fbe;
  --blue-soft: #dfeeff;
  --blue-dark: #173d73;
  --purple: #7c3aed;
  --purple-soft: #f0e7ff;
  --purple-dark: #4c1d95;
  --accent: #c4492d;
  --green: #2f855a;
  --green-dark: #185c3b;
  --green-soft: #e4f5ea;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
}

a {
  color: inherit;
}

.topbar {
  background: var(--primary);
  color: white;
  min-height: 74px;
  padding: 14px 22px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  box-shadow: 0 2px 12px rgba(0,0,0,.18);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand span {
  display: block;
  color: rgba(255,255,255,.72);
  font-size: 13px;
  margin-top: 2px;
}

.mainnav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}

.mainnav a {
  text-decoration: none;
  padding: 10px 13px;
  border-radius: 10px;
  color: rgba(255,255,255,.9);
}

.mainnav a:hover,
.mainnav a.active {
  background: rgba(255,255,255,.14);
  color: white;
}

.page {
  max-width: 1180px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

.hero {
  background: linear-gradient(135deg, #ffffff, #edf1f6);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 34px;
  margin-bottom: 22px;
}

.hero h1 {
  margin: 0 0 10px;
  color: var(--primary);
  font-size: clamp(30px, 5vw, 50px);
}

.lead {
  color: var(--muted);
  font-size: 18px;
  line-height: 1.5;
  margin: 0;
}

.module-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(280px, 1fr));
  gap: 22px;
  align-items: start;
}

.module-block {
  border-radius: 24px;
  padding: 22px;
  border: 1px solid var(--line);
  background: var(--panel);
  box-shadow: 0 12px 28px rgba(0,0,0,.06);
}

.module-block.heat {
  background: linear-gradient(145deg, #fff9df, #ffffff);
  border-color: #f1dfa5;
}

.module-block.acoustic {
  background: linear-gradient(145deg, #e8f3ff, #ffffff);
  border-color: #bfd8f5;
}

.module-block.measurement {
  background: linear-gradient(145deg, var(--purple-soft), #ffffff);
  border-color: #d8c4ff;
}

.module-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.module-icon {
  width: 54px;
  height: 54px;
  border-radius: 17px;
  display: grid;
  place-items: center;
  font-size: 26px;
  font-weight: 800;
}

.heat .module-icon {
  background: var(--yellow);
  color: var(--yellow-dark);
}

.acoustic .module-icon {
  background: var(--blue);
  color: white;
}

.measurement .module-icon {
  background: var(--purple);
  color: white;
}

.module-head h2 {
  margin: 0;
  font-size: 25px;
}

.module-head p {
  margin: 3px 0 0;
  color: var(--muted);
  line-height: 1.4;
}

.module-list {
  display: grid;
  gap: 10px;
}

.module-link {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  align-items: center;
  text-decoration: none;
  background: rgba(255,255,255,.75);
  border: 1px solid rgba(0,0,0,.07);
  border-radius: 16px;
  padding: 15px 16px;
  transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}

.module-link:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 22px rgba(0,0,0,.10);
}

.heat .module-link:hover {
  border-color: var(--yellow);
}

.acoustic .module-link:hover {
  border-color: var(--blue);
}

.measurement .module-link:hover {
  border-color: var(--purple);
}

.module-link strong {
  display: block;
  font-size: 17px;
}

.module-link span {
  display: block;
  color: var(--muted);
  font-size: 14px;
  margin-top: 3px;
  line-height: 1.35;
}

.arrow {
  color: var(--muted);
  font-size: 22px;
}

.tool-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 24px;
}

.tool-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 20px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 18px;
}

.tool-header h1 {
  margin: 0 0 8px;
  color: var(--primary);
}

.badge {
  display: inline-block;
  border-radius: 999px;
  padding: 7px 11px;
  font-size: 13px;
  font-weight: 700;
  white-space: nowrap;
}

.badge.heat {
  background: var(--yellow-soft);
  color: var(--yellow-dark);
}

.badge.acoustic {
  background: var(--blue-soft);
  color: var(--blue-dark);
}

.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(220px, 1fr));
  gap: 16px;
  margin-top: 18px;
}

label {
  font-weight: 700;
  color: #263544;
}

input, select {
  width: 100%;
  margin-top: 7px;
  padding: 12px;
  border: 1px solid #cfd8e3;
  border-radius: 10px;
  font-size: 16px;
  background: white;
}

button {
  border: 0;
  padding: 11px 14px;
  border-radius: 10px;
  cursor: pointer;
  background: var(--primary);
  color: white;
  font-weight: 700;
}

button.secondary {
  background: #eef2f6;
  color: var(--text);
}

button.danger {
  background: var(--accent);
}

.result {
  margin-top: 22px;
  padding: 18px;
  border-radius: 16px;
  background: #eef2f6;
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
}

.result span {
  font-weight: 700;
}

.result strong {
  font-size: 38px;
  color: var(--accent);
}

.result small {
  color: var(--muted);
}

.formula {
  margin-top: 18px;
  padding: 14px;
  border-left: 4px solid var(--primary);
  background: #f6f8fa;
  border-radius: 10px;
  line-height: 1.55;
}

.footer {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 20px 32px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 860px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .mainnav {
    justify-content: flex-start;
  }

  .module-grid {
    grid-template-columns: 1fr;
  }

  .tool-header {
    flex-direction: column;
  }

  .grid {
    grid-template-columns: 1fr;
  }

  .topbar {
    padding: 10px 14px;
    gap: 10px;
  }

  .brand {
    width: 100%;
    gap: 10px;
  }

  .brand span {
    font-size: 12px;
  }

  .mainnav a {
    padding: 8px 10px;
  }
}

@media (max-width: 430px) {
  .brand span {
    font-size: 11px;
  }
}


.footer-links {
  display: flex;
  gap: 8px;
  align-items: center;
}

.footer-links a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
}

.footer-links a:hover {
  text-decoration: underline;
}

.badge.measurement {
  background: var(--purple-soft);
  color: var(--purple-dark);
}


/* Spiel & Pause */
.break-section {
  margin-top: 22px;
}

.module-block.break {
  background: linear-gradient(135deg, var(--green-soft), #ffffff 68%);
  border-color: #acd7bb;
  padding: 24px;
}

.break .module-head {
  margin-bottom: 16px;
}

.break-icon {
  width: 54px;
  height: 54px;
  flex: 0 0 54px;
  border-radius: 17px;
  display: grid;
  place-items: center;
  background: var(--green);
  color: white;
  font-size: 22px;
  box-shadow: 0 8px 18px rgba(47, 133, 90, .22);
}

.break .module-link {
  background: rgba(255,255,255,.84);
}

.break .module-link:hover {
  border-color: var(--green);
}

.break .module-link strong {
  color: var(--green-dark);
  font-size: 20px;
}

.break-callout {
  display: inline-block !important;
  width: fit-content;
  margin-top: 10px !important;
  padding: 7px 11px;
  border-radius: 999px;
  background: var(--green);
  color: white !important;
  font-size: 13px !important;
  font-weight: 700;
}

.break .arrow {
  color: var(--green);
  font-size: 32px;
}

@media (max-width: 560px) {
  .module-block.break {
    padding: 18px;
  }

  .break-icon {
    width: 46px;
    height: 46px;
    flex-basis: 46px;
    border-radius: 14px;
  }

  .break .module-head h2 {
    font-size: 22px;
  }
}

/* Schlanker Kopfbereich mit textbasiertem BAUPHy-Logo */
.topbar {
  min-height: 58px;
  padding: 8px 20px;
  align-items: center;
}

.brand {
  gap: 0;
  line-height: 1;
}

.wordmark {
  display: inline-block;
  color: #fff;
  font-size: 44px;
  font-weight: 900;
  letter-spacing: -.9px;
  white-space: nowrap;
}

.wordmark > span {
  display: inline;
  color: var(--yellow);
  font-size: inherit;
  margin: 0;
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 38px;
  padding: 8px;
  border: 0;
  border-radius: 9px;
  background: rgba(255,255,255,.1);
  cursor: pointer;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 4px auto;
  border-radius: 2px;
  background: #fff;
  transition: transform .2s ease, opacity .2s ease;
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

.mainnav a {
  padding: 8px 11px;
  border-radius: 8px;
  font-size: 14px;
}

@media (max-width: 860px) {
  .topbar {
    position: relative;
    min-height: 52px;
    padding: 7px 12px;
    flex-direction: row;
    align-items: center;
    gap: 10px;
  }

  .brand {
    width: auto;
  }

  .wordmark {
    font-size: 38px;
  }

  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .mainnav {
    display: none;
    position: absolute;
    top: calc(100% + 1px);
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 8px 12px 12px;
    background: var(--primary-dark);
    box-shadow: 0 10px 18px rgba(0,0,0,.2);
  }

  .mainnav.is-open {
    display: grid;
    gap: 4px;
  }

  .mainnav a {
    width: 100%;
    padding: 10px 12px;
  }
}

@media (max-width: 430px) {
  .topbar {
    min-height: 48px;
    padding: 5px 10px;
  }

  .wordmark {
    font-size: 36px;
  }

  .nav-toggle {
    width: 38px;
    height: 36px;
  }
}

/* Zweischalige Konstruktionen */
.zweischalig-page {
  max-width: 1360px;
}

.zweischalig-hint {
  margin: 0 0 16px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid #ead68c;
  background: #fff8df;
  color: #67541b;
  line-height: 1.45;
}

.zweischalig-layout {
  display: grid;
  grid-template-columns: 420px minmax(520px, 1fr);
  gap: 14px;
  align-items: start;
}

.zweischalig-left {
  display: grid;
  gap: 14px;
}

.zweischalig-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  box-shadow: 0 7px 22px rgba(31,60,79,.05);
}

.zweischalig-card h2 {
  margin: 0 0 12px;
  color: var(--primary);
  font-size: 1.08rem;
}

.zweischalig-controls {
  display: grid;
  gap: 12px;
}

.zweischalig-controls label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: .86rem;
  font-weight: 700;
  color: #415561;
}

.zweischalig-controls select {
  margin-top: 0;
  padding: 10px;
  border-radius: 9px;
}

.zweischalig-range output {
  color: var(--blue);
  font-weight: 900;
}

.zweischalig-range input[type="range"] {
  width: 100%;
  margin-top: 3px;
  padding: 0;
  accent-color: var(--blue);
}

.zweischalig-model {
  display: flex;
  justify-content: center;
  align-items: center;
}

.zweischalig-wall {
  --cavity-width: 150px;
  width: min(100%, 360px);
  min-height: 152px;
  display: grid;
  grid-template-columns: auto var(--cavity-width) auto;
  align-items: stretch;
  gap: 10px;
  padding: 16px 14px;
  overflow: hidden;
  border: 1px solid #dce6eb;
  border-radius: 18px;
  background: linear-gradient(180deg, #fbfdfe 0%, #f3f7f9 100%);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.85);
}

.zweischalig-plates {
  display: flex;
  align-items: stretch;
  justify-content: center;
  gap: 4px;
  min-width: 34px;
}

.zweischalig-plates-left {
  justify-content: flex-end;
}

.zweischalig-plates-right {
  justify-content: flex-start;
}

.zweischalig-layer {
  width: 12px;
  min-height: 118px;
  border-radius: 4px;
  border: 1px solid rgba(79,72,59,.16);
  background: linear-gradient(180deg, #d8d2c5 0%, #c7c0b2 100%);
  box-shadow: inset 1px 0 0 rgba(255,255,255,.45), 0 1px 2px rgba(0,0,0,.04);
}

.zweischalig-cavity {
  position: relative;
  min-width: 90px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px dashed #b8c9d2;
  border-radius: 12px;
  background: linear-gradient(180deg, #f8fbfd 0%, #eef5f8 100%);
  box-shadow: inset 0 1px 0 rgba(255,255,255,.7);
}

.zweischalig-cavity-label {
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  color: #55707f;
  font-size: .78rem;
  font-weight: 900;
  letter-spacing: .08em;
  text-transform: uppercase;
}

.zweischalig-material-legend {
  display: flex;
  justify-content: center;
  margin-top: 12px;
  color: var(--muted);
  font-size: .77rem;
}

.zweischalig-material-box {
  display: inline-block;
  width: 15px;
  height: 10px;
  margin-right: 5px;
  border-radius: 2px;
  background: linear-gradient(180deg, #d8d2c5 0%, #c7c0b2 100%);
}

.zweischalig-results {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.zweischalig-result {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
}

.zweischalig-result span {
  display: block;
  color: var(--muted);
  font-size: .76rem;
  font-weight: 800;
}

.zweischalig-result strong {
  display: block;
  margin: 8px 0 4px;
  color: var(--text);
  font-size: 1.28rem;
  line-height: 1.05;
}

.zweischalig-result small {
  color: var(--muted);
  font-size: .74rem;
}

.zweischalig-chart-card canvas {
  display: block;
  width: 100%;
  height: 430px;
  border-radius: 12px;
  background: #fff;
}

.zweischalig-title-row p {
  margin: 0;
  color: var(--muted);
  font-size: .88rem;
}

.zweischalig-chart-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 8px;
  color: var(--muted);
  font-size: .78rem;
}

.zweischalig-line {
  display: inline-block;
  width: 26px;
  margin-right: 6px;
  border-top: 3px solid #245d86;
  vertical-align: middle;
}

.zweischalig-line.eig {
  border-color: #c85c67;
  border-top-style: dashed;
}

.zweischalig-line.ko1 {
  border-color: #559b67;
  border-top-style: dotted;
}

.zweischalig-line.ko2 {
  border-color: #7865b4;
  border-top-style: dotted;
}

.zweischalig-formulas {
  display: grid;
  gap: 10px;
  margin-top: 14px;
  padding: 12px;
  border: 1px solid #e2eaf0;
  border-radius: 12px;
  background: #f7fafc;
}

.zweischalig-formulas b {
  display: block;
  margin-bottom: 4px;
  color: var(--primary);
}

.zweischalig-formulas code {
  display: block;
  color: #425663;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .79rem;
  white-space: normal;
}

@media (max-width: 1080px) {
  .zweischalig-layout {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .zweischalig-results {
    grid-template-columns: 1fr 1fr;
  }

  .zweischalig-chart-card canvas {
    height: 330px;
  }

  .zweischalig-wall {
    width: 100%;
    min-height: 136px;
    padding: 14px 12px;
  }

  .zweischalig-layer {
    width: 11px;
    min-height: 102px;
  }
}