/* ============================================
   Marcel HD-Calculator — Design System
   Industrial / Yellow Accent / Clean
   ============================================ */

:root, [data-theme="light"] {
  --color-bg:          #f4f5f7;
  --color-surface:     #ffffff;
  --color-surface-2:   #f9fafb;
  --color-border:      #e2e5ea;
  --color-divider:     #ebedf0;

  --color-text:        #1a1d23;
  --color-text-muted:  #6b7280;
  --color-text-faint:  #9ca3af;

  /* Yellow accent */
  --color-accent:      #c89500;
  --color-accent-hover:#a67c00;
  --color-accent-soft: #fef9e7;
  --color-accent-text: #7a5a00;

  --color-warning-bg:  #fff8e6;
  --color-warning-border: #f5c518;
  --color-warning-text: #92610e;

  --color-info-bg:     #eef6ff;
  --color-info-border: #93c5fd;
  --color-info-text:   #1e5a9e;

  --color-highlight-bg:    #fefce8;
  --color-highlight-border:#d4a017;

  --color-input-bg:    #f7f8fa;
  --color-input-border:#dde0e5;
  --color-input-focus: #d4a017;

  --shadow-sm:  0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:  0 2px 8px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);

  --font-body:    'General Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:    'JetBrains Mono', 'SF Mono', 'Consolas', monospace;

  --radius-sm:  6px;
  --radius-md:  10px;
  --radius-lg:  14px;

  --transition: 200ms cubic-bezier(0.16, 1, 0.3, 1);
}

[data-theme="dark"] {
  --color-bg:          #0f1117;
  --color-surface:     #181a22;
  --color-surface-2:   #1e2029;
  --color-border:      #2a2d38;
  --color-divider:     #232630;

  --color-text:        #e4e5ea;
  --color-text-muted:  #8b8f9a;
  --color-text-faint:  #565a66;

  --color-accent:      #e8b830;
  --color-accent-hover:#f5cc50;
  --color-accent-soft: #2a2510;
  --color-accent-text: #e8b830;

  --color-warning-bg:  #2a2210;
  --color-warning-border: #a38415;
  --color-warning-text: #f5d76e;

  --color-info-bg:     #111d2e;
  --color-info-border: #2563eb;
  --color-info-text:   #93c5fd;

  --color-highlight-bg:   #22200e;
  --color-highlight-border:#e8b830;

  --color-input-bg:    #12141c;
  --color-input-border:#2a2d38;
  --color-input-focus: #e8b830;

  --shadow-sm:  0 1px 2px rgba(0,0,0,0.2);
  --shadow-md:  0 2px 8px rgba(0,0,0,0.25), 0 1px 2px rgba(0,0,0,0.15);
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  min-height: 100dvh;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.55;
  color: var(--color-text);
  background-color: var(--color-bg);
  padding-bottom: 80px;
}

input, button, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; background: none; border: none; }

/* --- Header --- */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding-top: env(safe-area-inset-top, 0px);
  /* Safe-area seitlich für Notch/Dynamic Island */
  padding-left: env(safe-area-inset-left, 0px);
  padding-right: env(safe-area-inset-right, 0px);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 20px;
  height: 60px;
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--color-text);
  flex: 1 1 auto;   /* Logo nimmt verfügbaren Platz, schrumpft aber */
  min-width: 0;
  overflow: hidden;
}

.logo svg { color: var(--color-text); }

.logo-text {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.02em;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.logo-accent {
  color: var(--color-accent);
}

/* Navigation */
.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--transition);
  white-space: nowrap;
}

.nav-btn:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

.nav-btn.active {
  color: var(--color-accent-text);
  background: var(--color-accent-soft);
  font-weight: 600;
}

.nav-svg {
  flex-shrink: 0;
}

.mobile-nav-svg {
  flex-shrink: 0;
}

.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  transition: all var(--transition);
  flex-shrink: 0; /* Niemals komprimieren */
}

.theme-toggle:hover {
  background: var(--color-surface-2);
  color: var(--color-accent);
}


/* --- Language Toggle --- */
.lang-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 38px;
  height: 38px;
  padding: 0 10px;
  border-radius: var(--radius-md);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--color-accent);
  border: 1.5px solid var(--color-accent);
  transition: all var(--transition);
  flex-shrink: 0;
}

.lang-toggle:hover {
  background: var(--color-accent-soft);
}

/* Mobile Navigation */
.mobile-nav {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 6px 8px calc(env(safe-area-inset-bottom, 0px) + 6px);
  justify-content: space-around;
  /* Bündig mit Content */
  padding-left: max(8px, calc((100% - 1100px) / 2));
  padding-right: max(8px, calc((100% - 1100px) / 2));
}

.mobile-nav-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 6px 12px;
  border-radius: var(--radius-md);
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-muted);
  transition: all var(--transition);
}

.mobile-nav-btn.active {
  color: var(--color-accent);
}



/* --- Main --- */
.main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 28px 20px 40px;
}

/* Sections */
.section {
  display: none;
  animation: fadeIn 300ms ease;
}

.section.active { display: block; }

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.section-header {
  margin-bottom: 24px;
}

.section-header-row {
  display: flex;
  align-items: center;
  gap: 16px;
}

.section-icon {
  flex-shrink: 0;
}

.section-header h1 {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.2;
}

.section-subtitle {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-top: 6px;
  max-width: 600px;
}

/* --- Cards --- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--shadow-sm);
  min-width: 0;       /* Verhindert Überlauf aus Grid-Zellen */
  overflow: hidden;   /* Kein horizontaler Scroll */
  width: 100%;
  box-sizing: border-box;
}

.card-title {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 20px;
}

.calc-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
  min-width: 0;
  overflow: hidden;
}

/* --- Inputs --- */
.input-grid {
  display: grid;
  gap: 16px;
}

.input-group label {
  display: block;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-muted);
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.input-wrap {
  display: flex;
  align-items: center;
  background: var(--color-input-bg);
  border: 1.5px solid var(--color-input-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.input-wrap:focus-within {
  border-color: var(--color-input-focus);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-input-focus) 15%, transparent);
}

.input-wrap input {
  flex: 1;
  padding: 10px 14px;
  border: none;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  outline: none;
  min-width: 0;
  -moz-appearance: textfield;
}

.input-wrap input::-webkit-outer-spin-button,
.input-wrap input::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}

.input-unit {
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 600;
  color: var(--color-accent);
  background: var(--color-accent-soft);
  border-left: 1px solid var(--color-input-border);
  white-space: nowrap;
  min-width: 48px;
  text-align: center;
}

.input-note {
  margin-top: 16px;
  font-size: 12px;
  color: var(--color-text-faint);
  font-style: italic;
}

/* --- Results --- */
.result-grid {
  display: grid;
  gap: 2px;
}

.result-item {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.result-item:nth-child(odd) {
  background: var(--color-surface-2);
}

.result-item.highlight {
  background: var(--color-highlight-bg);
  border-left: 3px solid var(--color-highlight-border);
  padding-left: 11px;
}

.result-item.large .result-value {
  font-size: 28px;
}

.result-label {
  font-size: 13px;
  color: var(--color-text-muted);
}

.result-value {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-text);
  text-align: right;
  letter-spacing: -0.02em;
}

.result-unit {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  min-width: 44px;
  text-align: right;
}

/* --- Warning & Info Boxes --- */
.warning-box {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  margin-top: 20px;
  padding: 14px 16px;
  background: var(--color-warning-bg);
  border: 1px solid var(--color-warning-border);
  border-radius: var(--radius-md);
}

.warning-icon {
  flex-shrink: 0;
  color: var(--color-warning-border);
  margin-top: 1px;
}

.warning-text {
  font-size: 13px;
  color: var(--color-warning-text);
  line-height: 1.5;
}

.info-box {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  margin-top: 20px;
  padding: 14px 16px;
  background: var(--color-info-bg);
  border: 1px solid var(--color-info-border);
  border-radius: var(--radius-md);
}

.info-icon {
  flex-shrink: 0;
  font-size: 16px;
  color: var(--color-info-border);
  font-weight: 600;
}

.info-box p {
  font-size: 13px;
  color: var(--color-info-text);
  line-height: 1.5;
}

/* --- Select / Dropdown --- */
.input-wrap--select {
  padding: 0;
  overflow: hidden;   /* Select darf nicht über Card hinauswachsen */
  min-width: 0;
}

.input-wrap--select select {
  flex: 1;
  width: 100%;
  min-width: 0;        /* Kein erzwungenes Minimum */
  max-width: 100%;     /* Niemals breiter als Container */
  padding: 10px 14px;
  border: none;
  background: transparent;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  outline: none;
  cursor: pointer;
  color: var(--color-text);
  appearance: auto;
  -webkit-appearance: auto;
}

.faktor-custom-input {
  margin-top: 8px;
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--color-input-border);
  border-radius: var(--radius-md);
  background: var(--color-input-bg);
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.faktor-custom-input:focus {
  border-color: var(--color-input-focus);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-input-focus) 15%, transparent);
}

/* Remove spinner from custom input */
.faktor-custom-input::-webkit-outer-spin-button,
.faktor-custom-input::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.faktor-custom-input { -moz-appearance: textfield; }

/* Label + Info-Button nebeneinander */
.label-row {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
}

.label-row label {
  margin-bottom: 0;
}

.info-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  color: var(--color-text-faint);
  border: 1.5px solid var(--color-border);
  flex-shrink: 0;
  transition: all var(--transition);
  padding: 0;
}

.info-toggle:hover,
.info-toggle--active {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: var(--color-accent-soft);
}

/* Hint-Box (ein-/ausblendbar) */
.faktor-hint-box {
  margin-top: 8px;
  padding: 10px 13px;
  background: var(--color-info-bg);
  border: 1px solid var(--color-info-border);
  border-radius: var(--radius-md);
  animation: fadeIn 200ms ease;
}

.faktor-hint {
  font-size: 12px;
  color: var(--color-info-text);
  line-height: 1.5;
  font-style: italic;
  word-break: break-word;
  overflow-wrap: break-word;
  margin: 0;
}

/* --- Nozzle Groups (Eingabe) --- */
.nozzle-group-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-faint);
  padding: 4px 0 2px;
  border-top: 1px solid var(--color-divider);
  margin-top: 4px;
}

.nozzle-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

/* --- Result Section Labels --- */
.result-section-label {
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  padding: 10px 14px 4px;
  border-top: 1px solid var(--color-divider);
  margin-top: 4px;
}

/* --- Converter --- */
.converter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.converter-card .card-title {
  margin-bottom: 16px;
}

.converter-row {
  display: flex;
  align-items: flex-end;
  gap: 12px;
}

.converter-row .input-group { flex: 1; }

.converter-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 44px;
  color: var(--color-accent);
  font-size: 18px;
  flex-shrink: 0;
  padding-bottom: 2px;
  font-weight: 700;
}

/* --- Footer --- */
.footer {
  max-width: 1100px;
  margin: 40px auto 0;
  padding: 24px 20px;
  border-top: 1px solid var(--color-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}

.footer p {
  font-size: 12px;
  color: var(--color-text-faint);
}

.footer .copyright {
  font-size: 12px;
  color: var(--color-accent);
  font-weight: 600;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  .nav { display: none; }
  .mobile-nav { display: flex; }

  body { padding-bottom: 100px; }

  .header-inner { height: 52px; }
  .main { padding: 20px 16px 32px; }

  .calc-layout {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .converter-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .converter-row {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }

  .converter-arrow {
    transform: rotate(90deg);
    width: 100%;
    height: 24px;
  }

  .card { padding: 20px 16px; }

  .result-item {
    grid-template-columns: 1fr;
    gap: 2px;
    padding: 10px 12px;
  }

  .result-value {
    text-align: left;
    font-size: 18px;
  }

  .result-unit {
    text-align: left;
    font-size: 11px;
  }

  .section-header h1 {
    font-size: 22px;
  }

  .footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  .input-wrap input {
    padding: 10px 12px;
    font-size: 16px;
  }

  /* Auf sehr kleinen Screens Labels kürzer */
  .input-group label {
    font-size: 11px;
  }

  /* Header-Innenabstand für kleine Phones */
  .header-inner {
    padding: 0 14px;
    gap: 8px;
  }

  /* Logo-Text darf kleiner werden */
  .logo-text {
    font-size: 15px;
  }

  /* Card-Padding enger auf kleinen Phones */
  .card {
    padding: 16px 14px;
    max-width: 100%;
    box-sizing: border-box;
  }

  /* Main weniger seitlicher Abstand */
  .main {
    padding: 16px 12px 32px;
  }

  /* Nozzle-Grid bleibt 2-spaltig aber Input-Wrap schrumpft */
  .nozzle-group .input-wrap {
    min-width: 0;
  }
  .nozzle-group .input-wrap input {
    min-width: 0;
    width: 100%;
  }
}

/* System preference fallback */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:          #0f1117;
    --color-surface:     #181a22;
    --color-surface-2:   #1e2029;
    --color-border:      #2a2d38;
    --color-divider:     #232630;
    --color-text:        #e4e5ea;
    --color-text-muted:  #8b8f9a;
    --color-text-faint:  #565a66;
    --color-accent:      #e8b830;
    --color-accent-hover:#f5cc50;
    --color-accent-soft: #2a2510;
    --color-accent-text: #e8b830;
    --color-warning-bg:  #2a2210;
    --color-warning-border: #a38415;
    --color-warning-text: #f5d76e;
    --color-info-bg:     #111d2e;
    --color-info-border: #2563eb;
    --color-info-text:   #93c5fd;
    --color-highlight-bg:   #22200e;
    --color-highlight-border:#e8b830;
    --color-input-bg:    #12141c;
    --color-input-border:#2a2d38;
    --color-input-focus: #e8b830;
    --shadow-sm:  0 1px 2px rgba(0,0,0,0.2);
    --shadow-md:  0 2px 8px rgba(0,0,0,0.25), 0 1px 2px rgba(0,0,0,0.15);
  }
}


/* ============================================
   Language Dropdown Menu
   ============================================ */
.lang-wrapper {
  position: relative;
  flex-shrink: 0;
  /* Niemals abschneiden */
  overflow: visible;
}

.lang-menu {
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  z-index: 200;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  min-width: 160px;
  padding: 4px;
  animation: fadeIn 150ms ease;
}

.lang-option {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  text-align: left;
  transition: background var(--transition);
  cursor: pointer;
  background: none;
  border: none;
}

.lang-option:hover {
  background: var(--color-surface-2);
  color: var(--color-accent);
}

.lang-flag {
  font-size: 16px;
  flex-shrink: 0;
  line-height: 1;
}

.lang-name {
  flex: 1;
}

/* Active language highlight */
.lang-option.active {
  color: var(--color-accent);
  background: var(--color-accent-soft);
}

/* ============================================
   Impressum Modal
   ============================================ */
.impressum-link {
  background: none;
  border: none;
  padding: 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: opacity var(--transition);
}
.impressum-link:hover { opacity: 0.7; }

.impressum-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 500;
  background: rgba(0, 0, 0, 0.65);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.impressum-overlay.active {
  display: flex;
}

.impressum-card {
  position: relative;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  max-width: 420px;
  width: 100%;
  box-shadow: var(--shadow-md);
  animation: fadeIn 200ms ease;
}

.impressum-close {
  position: absolute;
  top: 14px;
  right: 14px;
  background: var(--color-surface-2);
  border: none;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  font-size: 14px;
  color: var(--color-text-muted);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
}
.impressum-close:hover {
  background: var(--color-accent-soft);
  color: var(--color-accent);
}

.impressum-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: 4px;
}

.impressum-label {
  font-size: 11px;
  color: var(--color-text-faint);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.impressum-body p {
  font-size: 14px;
  color: var(--color-text-muted);
  line-height: 1.7;
}
.impressum-body strong {
  color: var(--color-text);
  font-weight: 600;
}