/* Globale Variablen für Theming */
:root {
    --bg-color-light: #f8f9fa;
    --text-color-light: #212529;
    --primary-color-light: #007bff;
    --secondary-color-light: #e9ecef;
    --border-color-light: #ced4da;
    --tooltip-bg-light: #343a40;
    --tooltip-text-light: #ffffff;
    --formula-color-light: #0056b3;
    --error-color-light: #dc3545;

    --bg-color-dark: #212529;
    --text-color-dark: #f8f9fa;
    --primary-color-dark: #0d6efd;
    --secondary-color-dark: #343a40;
    --border-color-dark: #495057;
    --tooltip-bg-dark: #f8f9fa;
    --tooltip-text-dark: #212529;
    --formula-color-dark: #6ea8fe;
    --error-color-dark: #ff6b6b;

    /* Standardmäßig Light Theme */
    --bg-color: var(--bg-color-light);
    --text-color: var(--text-color-light);
    --primary-color: var(--primary-color-light);
    --secondary-color: var(--secondary-color-light);
    --border-color: var(--border-color-light);
    --tooltip-bg: var(--tooltip-bg-light);
    --tooltip-text: var(--tooltip-text-light);
    --formula-color: var(--formula-color-light);
    --error-color: var(--error-color-light);
}

body.dark-mode {
    --bg-color: var(--bg-color-dark);
    --text-color: var(--text-color-dark);
    --primary-color: var(--primary-color-dark);
    --secondary-color: var(--secondary-color-dark);
    --border-color: var(--border-color-dark);
    --tooltip-bg: var(--tooltip-bg-dark);
    --tooltip-text: var(--tooltip-text-dark);
    --formula-color: var(--formula-color-dark);
    --error-color: var(--error-color-dark);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
    font-size: 16px; /* Basis-Schriftgröße */
}

.container {
    max-width: 950px; /* Etwas breiter für mehr Inhalt */
    margin: 20px auto;
    padding: 20px;
    background-color: var(--secondary-color);
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 20px;
    flex-wrap: wrap; /* Umbruch bei Bedarf */
}

header h1 {
    color: var(--primary-color);
    margin: 0 10px 0 0;
    font-size: 1.7em;
    flex-grow: 1; /* Nimmt verfügbaren Platz */
}

#dark-mode-toggle {
    background: none;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    cursor: pointer;
    font-size: 1.5em;
    padding: 5px;
    line-height: 1;
    transition: transform 0.3s ease;
    margin-left: auto; /* Schiebt nach rechts */
}
#dark-mode-toggle:hover {
    transform: scale(1.1) rotate(15deg);
}

/* Tab Navigation */
.tab-nav {
    margin-bottom: 0; /* Entfernt Lücke */
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0;
    white-space: nowrap; /* Verhindert Umbruch */
    overflow-x: auto; /* Horizontales Scrollen bei Bedarf */
    -webkit-overflow-scrolling: touch; /* Smoother scrolling on iOS */
}

.tab-button {
    padding: 12px 18px;
    cursor: pointer;
    border: 1px solid transparent;
    border-bottom: none;
    background-color: transparent;
    color: var(--text-color);
    font-size: 0.95em; /* Etwas kleiner */
    margin-right: 3px;
    border-radius: 5px 5px 0 0;
    transition: background-color 0.3s, border-color 0.3s, color 0.3s;
    position: relative;
    bottom: -1px; /* Überlappt die Border von .tab-nav */
}

.tab-button:hover {
    background-color: rgba(0, 123, 255, 0.1);
    color: var(--primary-color);
}
body.dark-mode .tab-button:hover {
    background-color: rgba(13, 110, 253, 0.2);
}

.tab-button.active {
    background-color: var(--bg-color); /* Hintergrund wie Content-Bereich */
    color: var(--primary-color);
    border-color: var(--border-color);
    border-bottom-color: var(--bg-color); /* Lässt Border unten "verschwinden" */
    font-weight: bold;
}
body.dark-mode .tab-button.active {
     border-bottom-color: var(--bg-color-dark);
}


/* Tab Content */
.tab-content {
    display: none;
    padding: 25px;
    border: 1px solid var(--border-color);
    border-top: none;
    border-radius: 0 0 8px 8px;
    background-color: var(--bg-color);
    transition: background-color 0.3s;
}

.tab-content.active {
    display: block;
}

h2, h3 {
    color: var(--primary-color);
    margin-top: 0;
    margin-bottom: 20px;
}
h3 {
    font-size: 1.25em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}
h4 {
    margin-top: 20px;
    margin-bottom: 10px;
    color: var(--text-color);
    font-size: 1.1em;
}


/* Input Groups & Fields */
.input-group, .result-group, .output-field {
    margin-bottom: 20px;
}
.output-field {
    display: flex;
    align-items: center;
    flex-wrap: wrap; /* Erlaubt Umbruch bei kleinen Bildschirmen */
    gap: 10px;
}

.input-group label, .output-field label {
    display: block;
    margin-bottom: 5px;
    font-weight: bold;
    flex-basis: 200px; /* Feste Basis für Labels in output-field */
    flex-shrink: 0;
}

.input-wrapper {
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative; /* Für Tooltip-Positionierung */
}

input[type="number"], input[type="text"], select {
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 1em;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.3s, color 0.3s, border-color 0.3s;
}
input[type="number"], input[type="text"]{
    flex-grow: 1; /* Nimmt verfügbaren Platz ein */
     min-width: 100px; /* Verhindert zu starkes Schrumpfen */
}

input[type="number"].error, input[type="text"].error {
    border-color: var(--error-color);
    background-color: rgba(220, 53, 69, 0.1);
}
body.dark-mode input[type="number"].error, body.dark-mode input[type="text"].error {
     background-color: rgba(255, 107, 107, 0.1);
}


input[readonly] {
    background-color: var(--secondary-color);
    cursor: not-allowed;
    opacity: 0.8;
}

select {
    flex-grow: 0; /* Nimmt nur benötigten Platz ein */
    padding-right: 30px; /* Platz für Pfeil */
    cursor: pointer;
    min-width: 60px;
}

.input-wrapper span:not(.tooltip) {
     padding: 0 5px;
     color: var(--text-color);
     white-space: nowrap;
}

/* Buttons */
button {
    padding: 10px 18px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 1em;
    transition: background-color 0.2s ease-in-out, opacity 0.2s;
    margin: 5px 10px 5px 0; /* Abstand um Buttons */
}

button:hover:not(:disabled) {
    background-color: #0056b3; /* Dunklerer Blauton für Hover */
}
body.dark-mode button:hover:not(:disabled) {
     background-color: #338bfd; /* Hellerer Blauton für Hover im Dark Mode */
}


button:disabled {
    background-color: #6c757d; /* Grau für deaktivierte Buttons */
    cursor: not-allowed;
    opacity: 0.65;
}

.export-buttons, .history button {
     margin-top: 15px;
}
#clear-history {
    background-color: var(--error-color);
}
#clear-history:hover {
    background-color: #a71d2a;
}
body.dark-mode #clear-history {
     background-color: var(--error-color-dark);
}
body.dark-mode #clear-history:hover {
     background-color: #ff8a8a;
}


/* Tooltips */
.tooltip {
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: help;
    margin-left: 5px;
    border: 1px solid var(--border-color);
    border-radius: 50%;
    width: 20px;
    height: 20px;
    font-size: 0.9em;
    font-weight: bold;
    color: var(--primary-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s, color 0.3s;
    flex-shrink: 0; /* Verhindert Schrumpfen */
}

.tooltip::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 130%; /* Position oberhalb */
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--tooltip-bg);
    color: var(--tooltip-text);
    padding: 8px 12px;
    border-radius: 4px;
    font-size: 0.9em;
    line-height: 1.4; /* Bessere Lesbarkeit bei Umbruch */
    white-space: normal; /* Erlaubt Umbruch */
    width: max-content; /* Passt sich Inhalt an */
    max-width: 280px; /* Maximale Breite */
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s, visibility 0.3s;
    z-index: 10;
    font-weight: normal;
    text-align: left;
}

.tooltip:hover::after {
    opacity: 1;
    visibility: visible;
}
/* Position Tooltip inside input wrapper if needed */
.input-wrapper .tooltip {
     /* position: absolute; */ /* Alternative Positionierung */
     /* right: -25px; */
     /* top: 50%; */
     /* transform: translateY(-50%); */
}


/* Formula Display */
.formula-display {
    margin-top: 8px;
    font-style: italic;
    color: var(--formula-color);
    font-size: 0.95em;
    min-height: 1.5em;
    word-wrap: break-word;
}
.calculation-formula {
    font-weight: normal; /* Normale Schrift für Formeln */
    margin-bottom: 15px;
}
.formula-display code, #g-comparison code, #history-table-container code {
    font-family: Consolas, Monaco, 'Andale Mono', 'Ubuntu Mono', monospace;
    background-color: var(--secondary-color);
    padding: 2px 5px;
    border-radius: 3px;
    font-size: 1.05em; /* Etwas größer für Code */
    border: 1px solid var(--border-color);
}

/* Visualizations */
.visualization {
    margin-top: 25px;
    padding-top: 15px;
    border-top: 1px dashed var(--border-color);
}
.visualization svg {
    display: block;
    margin: 10px auto;
    max-width: 100%;
    height: auto;
    background-color: rgba(128, 128, 128, 0.05);
    border-radius: 4px;
}

/* Result Comparison & History */
#g-comparison p { margin: 8px 0; }

#history-table-container {
     margin-top: 15px;
     max-height: 300px; /* Begrenzte Höhe mit Scrollbar */
     overflow-y: auto;
     border: 1px solid var(--border-color);
     border-radius: 4px;
}

#history-table-container table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9em;
}

#history-table-container th, #history-table-container td {
    border-bottom: 1px solid var(--border-color);
    padding: 8px 10px;
    text-align: left;
    white-space: nowrap; /* Verhindert Umbruch in Zellen */
}
#history-table-container td {
     border-left: 1px dashed var(--border-color); /* Trennlinien */
}
#history-table-container td:first-child { border-left: none; }


#history-table-container th {
    background-color: var(--secondary-color);
    font-weight: bold;
    position: sticky; /* Header bleibt beim Scrollen sichtbar */
    top: 0;
    z-index: 1;
}

#history-table-container tr:nth-child(even) {
    background-color: rgba(128, 128, 128, 0.05);
}
body.dark-mode #history-table-container tr:nth-child(even) {
     background-color: rgba(255, 255, 255, 0.05);
}
body.dark-mode #history-table-container th {
     background-color: var(--secondary-color-dark);
}

/* Styling für Steigungsberechnung (Tab 3) */
#slope-data-input {
    border: 1px solid var(--border-color);
    padding: 15px;
    border-radius: 4px;
    margin-bottom: 20px;
    background-color: var(--secondary-color);
}
#slope-data-input p { margin-top: 0; }

#slope-data-input .data-point {
    display: flex;
    gap: 10px;
    margin-bottom: 10px;
    align-items: center;
    flex-wrap: wrap; /* Umbruch für kleine Bildschirme */
}

#slope-data-input .data-point input[type="number"] {
    flex: 1 1 120px; /* Flexibel, aber Mindestbreite */
}
#slope-data-input .data-point select {
    flex: 0 0 70px; /* Feste Breite für Einheit */
    padding-right: 5px;
}

#add-data-point {
    background-color: #28a745; /* Green */
    font-weight: bold;
    padding: 5px 10px; /* Kleinerer Button */
    font-size: 1.2em;
    line-height: 1;
}
#add-data-point:hover { background-color: #218838; }

#calculate-slope {
    background-color: #ffc107; /* Yellow/Orange */
    color: #212529;
}
#calculate-slope:hover { background-color: #e0a800; }

#slope-result {
    margin-top: 10px;
    font-style: italic;
    color: var(--formula-color);
}
#slope-result code { font-size: 1em; } /* Normale Größe für Code hier */

hr {
    border: none;
    border-top: 1px dashed var(--border-color);
    margin: 30px 0;
}

section {
    margin-bottom: 30px;
}
section:last-child {
    margin-bottom: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 { font-size: 1.4em; }
    .tab-button { padding: 10px 12px; font-size: 0.9em;}
    .input-wrapper { flex-wrap: wrap; } /* Erlaubt Umbruch */
    input[type="number"], input[type="text"] { min-width: 150px; } /* Mehr Platz */
    .output-field label { flex-basis: 100%; margin-bottom: 2px;} /* Label über Input */
    .export-buttons { display: flex; flex-direction: column; gap: 10px; }
    .export-buttons button { width: 100%; margin-right: 0; }
}

@media (max-width: 480px) {
     body { font-size: 14px; }
    .container { margin: 10px; padding: 15px; }
    header h1 { font-size: 1.2em; }
    .tab-button { padding: 8px 10px; }
    h2 { font-size: 1.4em; }
    h3 { font-size: 1.15em; }
    input, select, button { font-size: 0.95em; }
    #slope-data-input .data-point { flex-direction: column; align-items: stretch; } /* Untereinander */
    #slope-data-input .data-point select { margin-top: 5px; }
     #history-table-container { font-size: 0.85em; } /* Noch kleiner für Tabelle */
     .tooltip::after { max-width: 200px; font-size: 0.85em;} /* Kleinere Tooltips */
}

.image-gallery {
    max-width: 1000px; /* Passt die Breite an den Hauptcontainer an oder setze eigene Breite */
    margin: 30px auto 20px auto; /* Oben/Unten Abstand, zentriert */
    padding: 20px;
    /* Optional: Hintergrund oder Rahmen, falls gewünscht */
    /* background-color: var(--secondary-color); */
    /* border: 1px solid var(--border-color); */
    /* border-radius: 8px; */
}

.image-gallery h2 {
    text-align: center;
    margin-bottom: 25px;
    color: var(--primary-color);
    font-size: 1.5em;
}

.gallery-container {
    display: flex; /* Bilder nebeneinander anordnen */
    flex-wrap: wrap; /* Umbruch bei Bedarf (kleine Bildschirme) */
    justify-content: space-around; /* Platz verteilen */
    gap: 20px; /* Abstand zwischen den Bildern */
}

.gallery-container figure {
    margin: 0;
    padding: 0;
    border: 1px solid var(--border-color); /* Leichter Rahmen um Bild + Text */
    border-radius: 4px;
    background-color: var(--bg-color);
    text-align: center;
    flex: 1 1 280px; /* Erlaubt Wachstum/Schrumpfen, Basisbreite ca. 280px */
    max-width: 320px; /* Maximale Breite pro Bild-Container */
    overflow: hidden; /* Verhindert Überlaufen */
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.gallery-container img {
    max-width: 100%; /* Bild passt sich der figure-Breite an */
    height: 100%; /* Höhe automatisch anpassen */
    display: block; /* Verhindert extra Leerraum unter dem Bild */
    
    object-fit: cover; /* Skaliert das Bild, um den Bereich zu füllen (wenn aspect-ratio genutzt wird) */
}

.gallery-container figcaption {
    padding: 10px;
    font-size: 0.9em;
    color: var(--text-color);
    background-color: var(--secondary-color); /* Hintergrund für die Caption */
    border-top: 1px solid var(--border-color);
}