:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent: #38bdf8;
    --accent-hover: #0284c7;
    --success: #4ade80;
    --error: #f87171;
    --error-hover: #dc2626;
}
body { 
    font-family: 'Segoe UI', system-ui, sans-serif; 
    background-color: var(--bg-color); 
    margin: 0; 
    padding: 40px 20px; 
    color: var(--text-main);
    display: flex;
    justify-content: center;
}
.container { 
    width: 100%;
    max-width: 1200px; 
    background: var(--card-bg); 
    padding: 40px; 
    box-shadow: 0 10px 30px rgba(0,0,0,0.3); 
    border-radius: 16px; 
    box-sizing: border-box;
}
h1 { text-align: center; color: var(--accent); margin-top: 0; font-size: 2.5rem; letter-spacing: -0.5px; }
h2 { color: var(--text-main); margin-top: 0; }
.section { padding: 10px 0; }
label { font-weight: 600; display: block; margin-bottom: 12px; color: var(--text-muted); font-size: 1.1rem; }
input[type="text"], textarea { 
    width: 100%; padding: 16px; background: #0f172a;
    border: 2px solid #334155; border-radius: 8px; box-sizing: border-box; 
    font-size: 16px; margin-bottom: 15px; color: var(--text-main); transition: border-color 0.2s;
    font-family: inherit;
}
input[type="text"]:focus, textarea:focus { border-color: var(--accent); outline: none; }
button { background-color: var(--accent); color: #0f172a; font-weight: bold; border: none; padding: 14px 28px; font-size: 16px; border-radius: 8px; cursor: pointer; transition: background 0.2s, color 0.2s; }
button:hover { background-color: var(--accent-hover); color: white; }
button:disabled { background-color: #334155; color: var(--text-muted); cursor: not-allowed; }

.secondary-btn { background-color: #334155; color: var(--text-main); }
.secondary-btn:hover { background-color: #475569; }
.exam-btn { background-color: #a855f7; color: white; }
.exam-btn:hover { background-color: #9333ea; }

.mic-btn { background-color: var(--error); color: #0f172a; margin-left: 15px; }
.mic-btn:hover { background-color: var(--error-hover); color: white; }
.mic-active { background-color: var(--success) !important; color: #0f172a !important; animation: pulse 1.5s infinite; }

/* BILLING PANEL */
.billing-panel { background: #0f172a; border: 1px solid #334155; border-radius: 12px; padding: 20px 24px; margin-bottom: 30px; }
.billing-panel h3 { margin-top: 0; margin-bottom: 8px; }
.billing-panel p { color: var(--text-muted); margin: 0 0 15px; }
.billing-panel .billing-subheading { margin-bottom: 12px; font-size: 0.95rem; }
.billing-actions { display: flex; gap: 15px; flex-wrap: wrap; }
.credit-pack-btn { padding: 10px 20px; font-size: 0.95rem; }
.billing-empty { margin: 0; }

/* NAVIGATION TABS */
.nav-tabs { display: flex; gap: 10px; margin-bottom: 30px; border-bottom: 2px solid #334155; padding-bottom: 10px; }
.tab-btn { background: transparent; color: var(--text-muted); padding: 10px 20px; font-size: 1.1rem; }
.tab-btn:hover { background: rgba(56, 189, 248, 0.1); color: var(--accent); }
.tab-btn.active { color: var(--accent); border-bottom: 3px solid var(--accent); border-radius: 8px 8px 0 0; }

/* TOPIC SUGGESTION CHIPS */
.suggestions-hint { margin: -6px 0 10px; font-size: 0.9rem; color: var(--text-muted); font-style: italic; }
.chip-container { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 20px; }
.topic-chip {
    background: rgba(56, 189, 248, 0.1);
    color: var(--accent);
    border: 1px solid rgba(56, 189, 248, 0.35);
    border-radius: 999px;
    padding: 8px 16px;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s, border-color 0.2s;
}
.topic-chip:hover { background: rgba(56, 189, 248, 0.2); border-color: var(--accent); }
.topic-chip.chip-more { color: var(--text-muted); border-style: dashed; border-color: #334155; background: transparent; cursor: default; }
.topic-chip.chip-more:hover { background: transparent; border-color: #334155; }

/* DASHBOARD LISTS */
.setup-actions { display: flex; gap: 15px; margin-bottom: 30px; }
.lists-container { display: grid; grid-template-columns: 1fr; gap: 30px; margin-top: 30px; }
@media (min-width: 768px) { .lists-container { grid-template-columns: 1fr 1fr; } }
.list-block { background: #0f172a; padding: 20px; border-radius: 12px; border: 1px solid #334155; }
.list-block h3 { margin-top: 0; border-bottom: 1px solid #334155; padding-bottom: 10px; color: var(--text-muted); }
.activity-list { list-style: none; padding: 0; margin: 0; }
.activity-item { display: flex; justify-content: space-between; align-items: center; padding: 12px 15px; background: var(--card-bg); margin-bottom: 10px; border-radius: 8px; border-left: 4px solid var(--accent); }
.activity-item.exam-type { border-left-color: #a855f7; }
.activity-item.completed-type { border-left-color: var(--success); }
.activity-info { display: flex; flex-direction: column; gap: 4px; }
.activity-title { font-weight: bold; font-size: 1.05rem; }
.activity-meta { font-size: 0.85rem; color: var(--text-muted); }
.activity-buttons { display: flex; gap: 8px; }
.delete-btn { background: transparent; color: var(--error); padding: 6px 12px; font-size: 0.9rem; border: 1px solid var(--error); }
.delete-btn:hover { background: var(--error); color: #0f172a; }

/* ABSCHLUSS-ZUSAMMENFASSUNG */
.grade-highlight { background: rgba(56, 189, 248, 0.1); color: var(--accent); padding: 25px; border-radius: 8px; border-left: 5px solid var(--accent); font-size: 1.8rem; font-weight: bold; text-align: center; margin-bottom: 30px; }
.milestone-item { display: flex; flex-direction: column; gap: 6px; padding: 14px 15px; background: var(--card-bg); margin-bottom: 10px; border-radius: 8px; border-left: 4px solid var(--success); }
.milestone-item-header { display: flex; justify-content: space-between; align-items: baseline; gap: 10px; }
.milestone-item-title { font-weight: bold; font-size: 1.05rem; }
.milestone-item-points { font-size: 0.9rem; color: var(--success); white-space: nowrap; }
.milestone-item-feedback { font-size: 0.9rem; color: var(--text-muted); line-height: 1.5; }

/* INTERFACE & WORKSPACE */
.interface-header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 20px; gap: 15px; flex-wrap: wrap; }
.header-actions { display: flex; align-items: center; gap: 15px; flex-wrap: wrap; }
.tts-toggle { display: flex; align-items: center; gap: 8px; cursor: pointer; color: var(--text-muted); font-size: 0.95rem; user-select: none; white-space: nowrap; }
.tts-toggle input { position: absolute; opacity: 0; width: 0; height: 0; }
.tts-toggle-slider { position: relative; width: 38px; height: 22px; background: #334155; border-radius: 999px; transition: background 0.2s; flex-shrink: 0; }
.tts-toggle-slider::before { content: ''; position: absolute; top: 3px; left: 3px; width: 16px; height: 16px; background: var(--text-main); border-radius: 50%; transition: transform 0.2s; }
.tts-toggle input:checked + .tts-toggle-slider { background: var(--accent); }
.tts-toggle input:checked + .tts-toggle-slider::before { transform: translateX(16px); }
.tts-toggle input:focus-visible + .tts-toggle-slider { outline: 2px solid var(--accent); outline-offset: 2px; }
.workspace-grid { display: grid; grid-template-columns: 1fr; gap: 30px; }
@media (min-width: 900px) { .workspace-grid { grid-template-columns: 1.2fr 0.8fr; } }
/* 1. Die linke Spalte als Flexbox mit fester Höhe definieren */
.chat-display { 
    display: flex; 
    flex-direction: column; 
    gap: 15px; 
    height: 520px; /* Feste, angenehme Höhe für das Lernfenster */
}

/* 2. Die Erklärung bekommt den Scrollbalken, wenn der Text zu lang wird */
/* --- OPTIMIERTES WORKSPACE-GRID & DYNAMISCHE HÖHEN --- */
.workspace-grid { 
    display: grid; 
    grid-template-columns: 1fr; 
    gap: 30px; 
    /* Zwingt das Grid auf eine angenehme, feste Mindesthöhe auf dem Bildschirm */
    min-height: 650px; 
    align-items: stretch;
}

@media (min-width: 900px) { 
    .workspace-grid { 
        grid-template-columns: 1.2fr 0.8fr; 
    } 
}

/* Linke Spalte: Wird zu einem flexiblen Spalten-Container */
.chat-display { 
    display: flex; 
    flex-direction: column; 
    gap: 15px; 
    height: 100%;
}

/* Die drei Boxen teilen sich den Raum kognitiv auf */
.feedback, .explanation, .question {
    flex: 1 1 auto; /* Boxen wachsen und schrumpfen dynamisch nach Inhalt */
    margin: 0;
    box-sizing: border-box;
    overflow-y: auto; /* Falls der Text extrem lang wird, scrollt NUR die Box intern */
    max-height: 350px; /* Verhindert, dass eine einzelne Box das ganze Layout sprengt */
}

/* Spezifisches Styling der Boxen bleibt erhalten */
.feedback { 
    background: rgba(74, 222, 128, 0.1); 
    color: var(--success); 
    padding: 18px; 
    border-radius: 8px; 
    border-left: 5px solid var(--success); 
    font-size: 16px; 
    line-height: 1.6; 
}

.explanation { 
    font-size: 18px; /* Leicht verkleinert für bessere Lesbarkeit im Grid */
    line-height: 1.6; 
    color: var(--text-main); 
    background: #0f172a; 
    padding: 22px; 
    border-radius: 8px; 
    border: 1px solid #334155; 
}

.question { 
    background: rgba(56, 189, 248, 0.1); 
    color: var(--accent); 
    padding: 20px; 
    border-radius: 8px; 
    font-weight: bold; 
    border-left: 5px solid var(--accent); 
    font-size: 18px; 
    line-height: 1.5; 
}

/* Rechte Spalte: Eingabebereich */
.input-display { 
    display: flex; 
    flex-direction: column; 
    height: 100%;
}

/* Das Textfeld für die Antwort wächst nun ebenfalls mit dem verfügbaren Platz! */
textarea#answer-input { 
    width: 100%; 
    flex-grow: 1; /* Nimmt den restlichen vertikalen Platz der rechten Spalte ein */
    min-height: 200px;
    padding: 16px; 
    background: #0f172a;
    border: 2px solid #334155; 
    border-radius: 8px; 
    box-sizing: border-box; 
    font-size: 16px; 
    margin-bottom: 15px; 
    color: var(--text-main); 
    transition: border-color 0.2s;
    resize: none; /* Verhindert, dass der User das Layout durch manuelles Ziehen zerstört */
}

.button-group { display: flex; width: 100%; }
.button-group button:first-child { flex: 1; }

.feedback { background: rgba(74, 222, 128, 0.1); color: var(--success); padding: 18px; border-radius: 8px; border-left: 5px solid var(--success); font-size: 16px; line-height: 1.6; }
.explanation { font-size: 20px; line-height: 1.7; color: var(--text-main); background: #0f172a; padding: 25px; border-radius: 8px; border: 1px solid #334155; }
.question { background: rgba(56, 189, 248, 0.1); color: var(--accent); padding: 20px; border-radius: 8px; font-weight: bold; border-left: 5px solid var(--accent); font-size: 18px; line-height: 1.5; }
.profile-info { color: var(--text-muted); margin-bottom: 25px; }
.form-group { margin-bottom: 20px; }

.admin-table-scroll { overflow-x: auto; }
.admin-users-table { width: 100%; border-collapse: collapse; white-space: nowrap; }
.admin-users-table th, .admin-users-table td { text-align: left; padding: 12px; border-bottom: 1px solid #334155; }
.admin-users-table th { color: var(--text-muted); font-weight: 600; }
.admin-panel { background: #0f172a; border: 1px solid #334155; border-radius: 12px; padding: 20px 24px; margin-top: 30px; }
.admin-panel h3 { margin-top: 0; margin-bottom: 15px; }
.admin-earnings-totals { color: var(--text-muted); margin: 15px 0 0; }
.admin-setting-row { display: flex; gap: 15px; align-items: center; flex-wrap: wrap; }
.admin-setting-row input[type="number"] { width: 140px; margin-bottom: 0; }
.admin-users-table .link-btn { background: none; border: none; color: var(--accent); padding: 0; font-size: 0.9rem; font-weight: normal; cursor: pointer; }
.admin-users-table .link-btn:hover { text-decoration: underline; background: none; }

.hidden { display: none !important; }
@keyframes spin { 0% { transform: rotate(0deg); } 100% { transform: rotate(360deg); } }
@keyframes pulse { 0% { opacity: 1; } 50% { opacity: 0.6; } 100% { opacity: 1; } }
.loading-container { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 40px; color: var(--text-muted); text-align: center; }
.spinner { border: 4px solid #334155; border-top: 4px solid var(--accent); border-radius: 50%; width: 50px; height: 50px; animation: spin 1s linear infinite; margin-bottom: 20px; }

.btn-success-flash {
    background-color: var(--success) !important;
    color: #0f172a !important;
    transition: background-color 0.2s ease;
}