:root {
    --background-color: #000000;
    --surface-color: #1A1A1A;
    --text-color: #E0E0E0;
    --text-color-secondary: #A0A0A0;
    --accent-color: #4CAF50; /* Ein dunkles Pastellgrün */
    --accent-color-border: #43A047;
    --label-important: #E57373; /* Rot/Orange */
    --label-optional: #64B5F6; /* Blau */
    --spacing-small: 8px;
    --spacing-medium: 16px;
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html, body {
    height: 100%;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: var(--font-family);
    overscroll-behavior: none;
    display: flex;
    justify-content: center;
    align-items: center;
}

#app-container {
    width: 100%;
    height: 100%;
    max-width: 480px; /* Mobile-First max-width */
    display: flex;
    flex-direction: column;
    position: relative;
    backdrop-filter: blur(0);
    transition: backdrop-filter 0.4s ease;
}

#app-container.settings-active {
    backdrop-filter: blur(8px);
}


header {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--spacing-medium);
    position: relative;
    width: 100%;
    z-index: 10;
}

.tab-switcher {
    display: flex;
    background-color: var(--surface-color);
    border-radius: 99px;
    padding: 4px;
    position: relative;
}

.tab-btn {
    background-color: transparent;
    border: none;
    color: var(--text-color-secondary);
    padding: var(--spacing-small) var(--spacing-medium);
    border-radius: 99px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
    z-index: 2;
}

.tab-btn.active {
    color: var(--background-color);
}

.tab-indicator {
    position: absolute;
    top: 4px;
    left: 4px;
    height: calc(100% - 8px);
    background-color: var(--accent-color);
    border-radius: 99px;
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1), width 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    z-index: 1;
}

.settings-trigger {
    position: absolute;
    right: var(--spacing-medium);
    top: 50%;
    transform: translateY(-50%);
}

#settings-btn {
    background: none;
    border: none;
    color: var(--text-color-secondary);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    transition: background-color 0.3s ease;
}

#settings-btn:hover {
    background-color: var(--surface-color);
}

#settings-btn svg {
    width: 22px;
    height: 22px;
    stroke: var(--text-color-secondary);
    transition: stroke 0.3s ease;
}

#settings-btn:hover svg {
    stroke: var(--text-color);
}

main {
    flex-grow: 1;
    position: relative;
    overflow: hidden;
}

.view {
    display: none;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    animation: fadeIn 0.5s ease-in-out;
}

.view.active {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* --- Sprachmodus --- */
.voice-container {
    display: flex;
    flex-direction: column;
    justify-content: flex-end; /* Align to bottom */
    align-items: center;
    height: 100%;
    width: 100%;
    padding: var(--spacing-medium);
    position: relative;
}

#voice-visualizer {
    position: absolute;
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 250px;
    height: 250px;
    pointer-events: none;
    filter: blur(5px);
}

.orb {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120px;
    height: 120px;
    background-color: var(--accent-color);
    border-radius: 50%;
    transform-origin: center center;
    opacity: 0;
    transform: translate(-50%, -50%) scale(0);
    animation: breath 6s infinite cubic-bezier(0.25, 1, 0.5, 1);
    animation-play-state: paused;
}

#voice-visualizer.active .orb {
    animation-play-state: running;
}

.orb:nth-child(2) {
    animation-delay: -2s;
    background-color: #66BB6A;
}

.orb:nth-child(3) {
    animation-delay: -4s;
    background-color: #81C784;
}

@keyframes breath {
    0%, 100% {
        transform: translate(-50%, -50%) scale(0.3);
        opacity: 0;
    }
    25% {
        transform: translate(-90%, -40%) scale(1.1);
        opacity: 0.3;
    }
    50% {
        transform: translate(-50%, -50%) scale(0.6);
        opacity: 0.15;
    }
    75% {
        transform: translate(-10%, -90%) scale(1.3);
        opacity: 0.3;
    }
}

#response-box {
    width: 100%;
    min-height: 100px;
    max-height: 50vh; /* Maximal 50% der Bildschirmhöhe */
    border: 1px solid var(--accent-color-border);
    background-color: rgba(26, 26, 26, 0.5);
    border-radius: 16px;
    padding: var(--spacing-medium);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    margin-bottom: var(--spacing-medium);
    z-index: 2;
    cursor: pointer;
    transition: background-color 0.3s ease, min-height 0.4s ease;
}

#response-box:hover {
    background-color: rgba(40, 40, 40, 0.7);
}

#response-box .placeholder {
    color: var(--text-color-secondary);
    display: block;
}

#response-content {
    width: 100%;
    overflow-y: auto; /* Scrollbar, wenn Inhalt zu groß ist */
    padding-right: 8px; /* Platz für die Scrollbar */
    margin-right: -8px; /* Padding ausgleichen */
}

#response-content p {
    animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

/* --- ToDo-Modus --- */
.todo-container {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: 0 var(--spacing-medium) var(--spacing-medium);
}

#task-list {
    list-style: none;
    flex-grow: 1;
    overflow-y: auto;
    padding-right: var(--spacing-small);
}

.empty-state {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--text-color-secondary);
    padding: var(--spacing-medium);
    height: calc(100% - 70px);
    opacity: 0;
    animation: fadeIn 0.5s ease forwards;
}

.empty-state svg {
    stroke: var(--accent-color-border);
    margin-bottom: var(--spacing-medium);
    opacity: 0.7;
}

.empty-state h3 {
    font-size: 18px;
    font-weight: 500;
    color: var(--text-color);
    margin-bottom: var(--spacing-small);
}

.empty-state p {
    font-size: 14px;
    max-width: 250px;
}


.task-item {
    background-color: var(--surface-color);
    border-radius: 12px;
    padding: var(--spacing-medium);
    margin-bottom: var(--spacing-small);
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.task-item.slide-in { animation: slideInUp 0.4s ease-out; }
.task-item.slide-out { animation: slideOutLeft 0.4s ease-out forwards; }

.task-item.completed .task-text {
    text-decoration: line-through;
    color: var(--text-color-secondary);
}
.task-item.completed { opacity: 0.6; }

.task-content { display: flex; align-items: center; gap: var(--spacing-medium); flex-grow: 1; }
.task-content input[type="checkbox"] {
    appearance: none;
    width: 20px;
    height: 20px;
    border: 2px solid var(--accent-color-border);
    border-radius: 50%;
    cursor: pointer;
    transition: background-color 0.2s ease, border-color 0.2s ease;
}
.task-content input[type="checkbox"]:checked {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
}
.task-details { display: flex; flex-direction: column; }
.task-label { font-size: 12px; padding: 2px 8px; border-radius: 99px; margin-top: 4px; align-self: flex-start; font-weight: 500;}
.task-label.important { background-color: var(--label-important); color: var(--background-color); }
.task-label.optional { background-color: var(--label-optional); color: var(--background-color); }

.delete-task-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-small);
    display: flex;
    align-items: center;
    justify-content: center;
}
.delete-task-btn svg {
    width: 20px;
    height: 20px;
    stroke: var(--text-color-secondary);
    transition: stroke 0.3s ease;
}
.delete-task-btn:hover svg { stroke: var(--label-important); }


#add-task-form { display: flex; gap: var(--spacing-small); margin-top: var(--spacing-medium); }
#task-input { flex-grow: 1; background-color: var(--surface-color); border: 1px solid var(--accent-color-border); border-radius: 12px; padding: var(--spacing-medium); color: var(--text-color); font-size: 16px; }
#add-task-form button { background-color: var(--accent-color); border: none; color: var(--background-color); font-size: 24px; font-weight: bold; border-radius: 12px; width: 50px; height: 50px; cursor: pointer; }

/* --- Settings --- */
#settings-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
    z-index: 100;
    transform: translateX(100%);
    transition: transform 0.4s cubic-bezier(0.25, 1, 0.5, 1);
    display: flex;
    justify-content: flex-end;
}

#settings-overlay:not(.active) {
    pointer-events: none;
}

#settings-overlay.active { transform: translateX(0); }

.settings-panel {
    background-color: var(--background-color);
    border-left: 1px solid var(--surface-color);
    width: 100%;
    max-width: 480px;
    height: 100%;
    display: flex;
    flex-direction: column;
    padding: var(--spacing-medium);
}
.settings-header { display: flex; justify-content: space-between; align-items: center; padding-bottom: var(--spacing-medium); border-bottom: 1px solid var(--surface-color); }
#close-settings-btn { background: none; border: none; color: var(--text-color-secondary); font-size: 32px; cursor: pointer; }
.settings-content { padding-top: var(--spacing-medium); overflow-y: auto; }
.form-group { margin-bottom: var(--spacing-medium); }
.form-group label { display: block; margin-bottom: var(--spacing-small); color: var(--text-color-secondary); }
.form-group input, .form-group textarea, .form-group select { width: 100%; background-color: var(--surface-color); border: 1px solid var(--accent-color-border); border-radius: 8px; padding: var(--spacing-small) var(--spacing-medium); color: var(--text-color); font-size: 16px; font-family: var(--font-family); transition: border-color 0.3s ease; }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
    max-height: 240px;
    overflow-y: auto;
}

/* Dark Scrollbar */
textarea::-webkit-scrollbar, .settings-content::-webkit-scrollbar, #task-list::-webkit-scrollbar {
    width: 8px;
}
textarea::-webkit-scrollbar-track, .settings-content::-webkit-scrollbar-track, #task-list::-webkit-scrollbar-track {
    background: var(--surface-color);
    border-radius: 4px;
}
textarea::-webkit-scrollbar-thumb, .settings-content::-webkit-scrollbar-thumb, #task-list::-webkit-scrollbar-thumb {
    background: var(--accent-color-border);
    border-radius: 4px;
}
textarea::-webkit-scrollbar-thumb:hover, .settings-content::-webkit-scrollbar-thumb:hover, #task-list::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}


.api-keys-container .api-key-input:not(:last-child) {
    margin-bottom: var(--spacing-small);
}
.api-keys-container label {
    font-size: 14px;
}
.api-keys-container label:not(:first-child) {
    margin-top: var(--spacing-small);
}

.settings-group {
    border: 1px solid var(--surface-color);
    padding: var(--spacing-medium);
    border-radius: 8px;
    margin-bottom: var(--spacing-medium);
}
.settings-group legend {
    padding: 0 var(--spacing-small);
    color: var(--text-color-secondary);
    font-size: 16px;
    font-weight: 500;
}

/* Collapsible API Section */
.settings-group.collapsible > legend {
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    padding: 0; /* Remove legend's default padding */
}

.collapsible-arrow {
    border: solid var(--text-color-secondary);
    border-width: 0 2px 2px 0;
    display: inline-block;
    padding: 3px;
    transform: rotate(45deg); /* Down arrow */
    transition: transform 0.3s ease;
    margin-right: var(--spacing-small);
}

.settings-group.collapsible.collapsed .collapsible-arrow {
    transform: rotate(-45deg); /* Right arrow */
}

.collapsible-content {
    max-height: 1000px; /* Large value */
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.25, 1, 0.5, 1), padding-top 0.5s cubic-bezier(0.25, 1, 0.5, 1);
    padding-top: var(--spacing-medium);
}
.settings-group.collapsible.collapsed .collapsible-content {
    max-height: 0;
    padding-top: 0;
}


#save-settings-btn { width: 100%; background-color: var(--accent-color); border: none; color: var(--background-color); padding: var(--spacing-medium); border-radius: 8px; font-size: 16px; font-weight: bold; cursor: pointer; margin-top: var(--spacing-medium); }

.save-confirmation {
    text-align: center;
    margin-top: var(--spacing-medium);
    color: var(--accent-color);
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.save-confirmation.show { opacity: 1; }


/* TTS Switch & Sliders */
.tts-options { display: flex; justify-content: space-between; align-items: center; margin-bottom: var(--spacing-medium); }
.switch { position: relative; display: inline-block; width: 50px; height: 28px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--surface-color); transition: .4s; }
.slider:before { position: absolute; content: ""; height: 20px; width: 20px; left: 4px; bottom: 4px; background-color: var(--text-color-secondary); transition: .4s; }
input:checked + .slider { background-color: var(--accent-color); }
input:checked + .slider:before { transform: translateX(22px); }
.slider.round { border-radius: 34px; }
.slider.round:before { border-radius: 50%; }

.slider-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-small);
}
.slider-group label {
    flex-basis: 80px;
    margin-bottom: 0;
}
.slider-group input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 8px;
    background: var(--surface-color);
    border-radius: 5px;
    outline: none;
    padding: 0;
    margin: 0;
}
.slider-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid var(--background-color);
}
.slider-group input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--accent-color);
    cursor: pointer;
    border-radius: 50%;
    border: 2px solid var(--background-color);
}
.slider-group .slider-value {
    min-width: 30px;
    text-align: right;
    font-size: 14px;
    color: var(--text-color-secondary);
}


/* Animation Keyframes */
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideInUp { from { transform: translateY(50px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes slideOutLeft { from { transform: translateX(0); opacity: 1; } to { transform: translateX(-50px); opacity: 0; } }