:root {
    --bg-color: #f4f7f6;
    --panel-bg: #ffffff;
    --text-color: #333333;
    --accent-color: #007bff;
    --border-color: #e0e0e0;
    --font-family: 'Inter', sans-serif;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

header {
    text-align: center;
    padding: 2rem 1rem;
    background-color: var(--panel-bg);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

header h1 {
    margin: 0;
    color: var(--text-color);
    font-size: 2.5rem;
    letter-spacing: -0.5px;
}

header p {
    color: #666;
    margin-top: 0.5rem;
    font-size: 1.1rem;
}

.toggle-container {
    display: none;
    justify-content: center;
    padding: 1.5rem 1rem 0.5rem 1rem;
    gap: 15px;
}

.toggle-container button {
    padding: 0.6rem 2rem;
    border: 2px solid var(--accent-color);
    background-color: transparent;
    color: var(--accent-color);
    border-radius: 30px;
    cursor: pointer;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
}

.toggle-container button.active {
    background-color: var(--accent-color);
    color: white;
    box-shadow: 0 4px 10px rgba(0, 123, 255, 0.3);
}

.container {
    display: flex;
    flex: 1;
    padding: 2rem;
    gap: 2rem;
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
    box-sizing: border-box;
}

.panel {
    flex: 1;
    background-color: var(--panel-bg);
    border-radius: 16px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.05);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.panel:focus-within {
    box-shadow: 0 10px 40px rgba(0, 123, 255, 0.15);
    border-color: var(--accent-color);
}

/* Upload Area Styling */
.upload-area {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem 2rem 0;
    border-bottom: 1px solid var(--border-color);
    background-color: #fafbfc;
}

.file-input {
    display: none;
}

.upload-btn {
    background-color: #ffffff;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    margin-bottom: 1rem;
}

.upload-btn:hover {
    background-color: #f0f4f8;
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.clear-btn {
    background-color: #ffffff;
    border: 1px solid #ff4d4f;
    color: #ff4d4f;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    margin-bottom: 1rem;
}

.clear-btn:hover {
    background-color: #fff1f0;
    border-color: #ff4d4f;
}

#loading-indicator {
    color: var(--accent-color);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.hidden {
    display: none !important;
}

textarea {
    width: 100%;
    height: 100%;
    min-height: 500px;
    border: none;
    resize: none;
    padding: 1.5rem 2rem;
    font-family: var(--font-family);
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--text-color);
    box-sizing: border-box;
    outline: none;
    background-color: transparent;
}

textarea::placeholder {
    color: #aaa;
}

#text-output {
    padding: 2rem;
    font-size: 1.15rem;
    line-height: 1.7;
    white-space: pre-wrap;
    overflow-y: auto;
    height: 100%;
    min-height: 500px;
    color: var(--text-color);
}

strong {
    font-weight: 700;
}

/* Responsives Design für kleinere Bildschirme (Tablets & Smartphones) */
@media (max-width: 900px) {
    .toggle-container {
        display: flex;
    }

    .container {
        display: block; /* Umschalten auf Block-Layout */
        padding: 1rem;
    }

    .panel {
        display: none; /* Erstmal ausblenden */
        min-height: 65vh;
        border-radius: 12px;
    }

    textarea, #text-output {
        min-height: 65vh;
        padding: 1.5rem;
        font-size: 1.05rem;
    }

    /* Ansicht steuern über Klassen auf dem Main-Container */
    .container.view-input .input-panel {
        display: flex;
        animation: fadeIn 0.3s ease-in-out;
    }

    .container.view-output .output-panel {
        display: flex;
        animation: fadeIn 0.3s ease-in-out;
    }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}