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

:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --bg-dark: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
    --bg-light: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 50%, #e0e6ff 100%);
    --glass-dark: rgba(255, 255, 255, 0.05);
    --glass-light: rgba(255, 255, 255, 0.9);
    --border-dark: rgba(255, 255, 255, 0.1);
    --border-light: rgba(0, 0, 0, 0.1);
    --text-dark: #ffffff;
    --text-light: #2c3e50;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --accent-color: #ffc107;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'SF Pro Display', sans-serif;
    height: 100vh;
    background: var(--bg-dark);
    color: var(--text-dark);
    overflow: hidden;
    transition: all 0.3s ease;
}

/* Light Theme */
body.light-theme {
    background: var(--bg-light);
    color: var(--text-light);
}

body.light-theme .login-container,
body.light-theme .chat-container {
    background: var(--bg-light);
}

body.light-theme .login-box,
body.light-theme .chat-header,
body.light-theme .settings-panel,
body.light-theme .chat-input {
    background: var(--glass-light);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-light);
    color: var(--text-light);
}

body.light-theme .message.user .message-content {
    background: var(--primary-gradient);
    color: #ffffff;
}

body.light-theme .message.assistant .message-content {
    background: rgba(255, 255, 255, 0.8);
    color: var(--text-light);
    border: 1px solid var(--border-light);
}

body.light-theme input,
body.light-theme select,
body.light-theme textarea {
    background: rgba(255, 255, 255, 0.8);
    color: var(--text-light);
    border: 1px solid rgba(0, 0, 0, 0.2);
}

body.light-theme .btn {
    background: var(--primary-gradient);
    color: #ffffff;
}

body.light-theme .logout-btn,
body.light-theme .theme-toggle {
    background: rgba(0, 0, 0, 0.1);
    color: var(--text-light);
}

body.light-theme .logout-btn:hover,
body.light-theme .theme-toggle:hover {
    background: rgba(0, 0, 0, 0.2);
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: var(--glass-dark);
    backdrop-filter: blur(10px);
    color: var(--text-dark);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--shadow-color);
    z-index: 1001;
}

.theme-toggle:hover {
    transform: scale(1.1);
    background: rgba(255, 193, 7, 0.2);
}

/* Professionelles SVG Logo */
.logo-svg {
    filter: drop-shadow(0 2px 8px rgba(255, 193, 7, 0.3));
}

/* Login */
.login-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 50%, #16213e 100%);
    z-index: 1000;
}

.login-box {
    background: var(--glass-dark);
    backdrop-filter: blur(20px);
    border: 1px solid var(--border-dark);
    padding: 48px;
    border-radius: 24px;
    box-shadow: 0 24px 48px var(--shadow-color);
    width: 420px;
    text-align: center;
    position: relative;
    overflow: hidden;
    animation: slideInUp 0.6s ease-out;
}

.login-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255, 193, 7, 0.8), transparent);
}

.login-box h1 {
    margin-bottom: 40px;
    color: #ffffff;
    font-weight: 600;
    font-size: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.input-group {
    margin-bottom: 20px;
    text-align: left;
}

label {
    display: none; /* Labels verstecken statt entfernen */
    margin-bottom: 8px;
    font-weight: 500;
    color: #e4e6ea;
    font-size: 14px;
}

select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 12px;
    font-size: 14px;
    transition: all 0.3s ease;
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
    backdrop-filter: blur(10px);
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffc107' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6,9 12,15 18,9'%3e%3c/polyline%3e%3c/svg%3e");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 16px;
    padding-right: 40px;
}

select:hover {
    border-color: rgba(255, 193, 7, 0.3);
    background: rgba(255, 255, 255, 0.12);
}

select:focus {
    border-color: rgba(255, 193, 7, 0.6);
    box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.1);
}

/* Custom Dropdown Styling */
select option {
    background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    color: #ffffff;
    padding: 12px 16px;
    border: none;
    font-size: 14px;
}

select option:hover {
    background: linear-gradient(135deg, #2d2d4a 0%, #252859 100%);
}

select option:checked {
    background: linear-gradient(135deg, #ffc107 0%, #ff8f00 100%);
    color: #1a1a2e;
    font-weight: 600;
}

input, textarea {
    width: 100%;
    padding: 16px 20px;
    border: 1px solid var(--border-dark);
    border-radius: 16px;
    font-size: 16px;
    transition: all 0.3s ease;
    background: var(--glass-dark);
    color: var(--text-dark);
    backdrop-filter: blur(10px);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.1);
    background: rgba(255, 255, 255, 0.08);
    transform: translateY(-1px);
}

input::placeholder, textarea::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.btn {
    background: var(--primary-gradient);
    color: #ffffff;
    padding: 16px 32px;
    border: none;
    border-radius: 16px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 600;
    transition: all 0.3s ease;
    width: 100%;
    box-shadow: 0 8px 24px rgba(102, 126, 234, 0.3);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s;
}

.btn:hover::before {
    left: 100%;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(102, 126, 234, 0.4);
}

.btn:disabled {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    transform: none;
    cursor: not-allowed;
    box-shadow: none;
}

.login-error {
    color: #ff6b6b;
    margin-top: 20px;
    padding: 16px;
    background: rgba(255, 107, 107, 0.1);
    border: 1px solid rgba(255, 107, 107, 0.2);
    border-radius: 12px;
    font-size: 14px;
}

.hidden {
    display: none;
}

/* Chat Interface */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    position: relative;
}

.chat-container.hidden {
    display: none;
}

.chat-header {
    background: var(--glass-dark);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-dark);
    padding: 24px 32px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.chat-header h1 {
    display: flex;
    align-items: center;
    color: var(--text-dark);
    font-size: 24px;
    font-weight: 600;
    gap: 12px;
}

.header-controls {
    display: flex;
    gap: 12px;
    align-items: center;
}

.logout-btn {
    background: rgba(255, 107, 107, 0.2);
    color: #ffffff;
    padding: 12px 24px;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logout-btn:hover {
    background: rgba(255, 107, 107, 0.3);
    transform: translateY(-1px);
}

.settings-panel {
    background: var(--glass-dark);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-dark);
    padding: 20px 32px;
    display: grid;
    grid-template-columns: 2fr 1fr auto;
    gap: 20px;
    align-items: end;
}

.settings-panel select {
    padding: 10px 16px;
    font-size: 14px;
    border-radius: 10px;
    background-size: 14px;
    padding-right: 36px;
}

.settings-panel input[type="number"] {
    padding: 10px 14px;
    font-size: 14px;
    border-radius: 10px;
    width: 80px;
}

.settings-panel label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 500;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    color: #e4e6ea;
    margin-top: 4px;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: #ffc107;
    margin: 0;
}

.checkbox-group span {
    font-size: 14px;
    color: #e4e6ea;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 24px 32px 140px 32px; /* Mehr Platz für Input */
    background: transparent;
    scroll-behavior: smooth;
}

.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    transition: background 0.3s ease;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Firefox Scrollbar */
.chat-messages {
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

.message {
    margin-bottom: 32px;
    display: flex;
    gap: 16px;
}

.message.user {
    flex-direction: row-reverse;
}

.message-avatar {
    width: 48px;
    height: 48px;
    border-radius: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    color: white;
    flex-shrink: 0;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
}

.message.user .message-avatar {
    background: linear-gradient(135deg, #ffc107 0%, #ff8f00 100%);
    color: #1a1a2e;
}

.message.assistant .message-avatar {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

/* TTS Button Styles */
.tts-button {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    border: none;
    background: var(--glass-dark);
    backdrop-filter: blur(10px);
    color: var(--accent-color);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 16px;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px var(--shadow-color);
    opacity: 0.7;
}

.tts-button:hover {
    background: rgba(255, 193, 7, 0.2);
    transform: scale(1.1);
    opacity: 1;
}

.tts-button.playing {
    background: var(--accent-color);
    color: #1a1a2e;
    animation: pulse 2s infinite;
}

.tts-button.loading {
    animation: spin 1s linear infinite;
}

.tts-button.error {
    background: rgba(255, 107, 107, 0.2);
    color: #ff6b6b;
}

@keyframes pulse {
    0% { opacity: 1; }
    50% { opacity: 0.7; }
    100% { opacity: 1; }
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* Message Content with TTS */
.message-content {
    max-width: 75%;
    padding: 20px 24px;
    border-radius: 24px;
    line-height: 1.7;
    word-wrap: break-word;
    position: relative;
    padding-top: 50px; /* Platz für TTS-Button */
}

.message.user .message-content {
    background: var(--primary-gradient);
    color: #ffffff;
    border-bottom-right-radius: 8px;
    box-shadow: 0 8px 32px rgba(102, 126, 234, 0.2);
}

.message.assistant .message-content {
    background: var(--glass-dark);
    color: var(--text-dark);
    border-bottom-left-radius: 8px;
    box-shadow: 0 8px 32px var(--shadow-color);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-dark);
}

/* Markdown in messages */
.message-content h1, .message-content h2, .message-content h3 {
    margin-top: 20px;
    margin-bottom: 12px;
}

.message-content h1 { font-size: 20px; color: #ffc107; font-weight: 600; }
.message-content h2 { font-size: 18px; color: #ff8f00; font-weight: 600; }
.message-content h3 { font-size: 16px; color: #ffcc80; font-weight: 600; }

.message.user .message-content h1,
.message.user .message-content h2,
.message.user .message-content h3 {
    color: #1a1a2e;
}

.message-content strong { 
    color: #ffc107;
    font-weight: 600;
}

.message.user .message-content strong {
    color: #1a1a2e;
}

.message-content code {
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 8px;
    border-radius: 6px;
    font-family: 'SF Mono', 'Monaco', monospace;
    font-size: 14px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.message.user .message-content code {
    background: rgba(26, 26, 46, 0.2);
    color: #1a1a2e;
}

.message-content ul, .message-content ol {
    padding-left: 24px;
    margin: 16px 0;
}

.message-content li {
    margin-bottom: 8px;
}

/* Loading animation */
.typing-indicator {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 20px 24px;
}

.typing-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255, 193, 7, 0.7);
    animation: typing 1.4s infinite ease-in-out;
}

.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing {
    0%, 80%, 100% {
        transform: scale(0.8);
        opacity: 0.5;
    }
    40% {
        transform: scale(1.2);
        opacity: 1;
    }
}

.chat-input {
    background: var(--glass-dark);
    backdrop-filter: blur(20px);
    border-top: 1px solid var(--border-dark);
    padding: 20px 32px;
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 1200px;
    z-index: 100;
    box-shadow: 0 -8px 32px var(--shadow-color);
}

.input-container {
    display: flex;
    gap: 16px;
    align-items: flex-end;
    max-width: 100%;
}

.input-container textarea {
    flex: 1;
    min-height: 52px;
    max-height: 150px;
    resize: none;
    border-radius: 26px;
    padding: 16px 20px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.08);
    color: #ffffff;
    font-size: 16px;
    line-height: 1.5;
    font-family: inherit;
}

.input-container textarea:focus {
    border-color: rgba(255, 193, 7, 0.5);
    box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.1);
}

.send-btn {
    width: 52px;
    height: 52px;
    border-radius: 26px;
    background: var(--primary-gradient);
    border: none;
    color: #ffffff;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.3);
    flex-shrink: 0;
}

.send-btn:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 32px rgba(102, 126, 234, 0.4);
}

.send-btn:disabled {
    background: rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    transform: none;
    box-shadow: none;
}

/* Legacy TTS Button - wird durch neue Styles ersetzt */
.tts-button-legacy {
    background: rgba(255, 193, 7, 0.1);
    border: 1px solid rgba(255, 193, 7, 0.3);
    border-radius: 8px;
    color: #ffc107;
    cursor: pointer;
    font-size: 14px;
    padding: 4px 8px;
    margin-left: 8px;
    transition: all 0.3s ease;
    float: right;
}

.tts-button-legacy:hover {
    background: rgba(255, 193, 7, 0.2);
    border-color: rgba(255, 193, 7, 0.5);
    transform: scale(1.1);
}

.tts-button:hover {
    background: rgba(255, 193, 7, 0.2);
    border-color: rgba(255, 193, 7, 0.5);
    transform: scale(1.1);
}

/* Screen Reader Only */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 768px) {
    .settings-panel {
        grid-template-columns: 1fr;
        gap: 16px;
        padding: 16px 20px;
    }
    
    .message-content {
        max-width: 85%;
        padding: 16px 20px;
        padding-top: 40px;
    }

    .chat-messages {
        padding: 16px 20px 120px 20px;
    }

    .chat-input {
        padding: 16px 20px;
    }

    .chat-header {
        padding: 16px 20px;
    }

    .chat-header h1 {
        font-size: 20px;
    }

    .login-box {
        width: 90%;
        max-width: 380px;
        padding: 32px 24px;
    }

    .theme-toggle {
        top: 15px;
        right: 15px;
        width: 45px;
        height: 45px;
    }

    .tts-button {
        width: 28px;
        height: 28px;
        font-size: 14px;
        top: 8px;
        right: 8px;
    }
}

@media (max-width: 480px) {
    .message-content {
        max-width: 90%;
        padding: 12px 16px;
        padding-top: 36px;
    }

    .chat-messages {
        padding: 12px 16px 100px 16px;
    }

    .chat-input {
        padding: 12px 16px;
    }

    .input-container textarea {
        font-size: 14px;
        padding: 12px 16px;
    }

    .send-btn {
        width: 44px;
        height: 44px;
    }
}

/* Verbesserte Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Dark/Light Theme Toggle Enhancements */
.theme-toggle-icon {
    transition: transform 0.3s ease;
}

body.light-theme .theme-toggle-icon {
    transform: rotate(180deg);
}

/* Hover-Effekte für bessere UX */
.message-content:hover .tts-button {
    opacity: 1;
    transform: scale(1.05);
}

/* Status-Anzeigen für TTS */
.tts-status {
    position: fixed;
    bottom: 100px;
    right: 20px;
    background: var(--glass-dark);
    backdrop-filter: blur(10px);
    padding: 12px 16px;
    border-radius: 12px;
    color: var(--text-dark);
    font-size: 14px;
    border: 1px solid var(--border-dark);
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.3s ease;
    z-index: 1000;
}

.tts-status.show {
    opacity: 1;
    transform: translateY(0);
}

.tts-status.success {
    border-color: rgba(76, 175, 80, 0.5);
    background: rgba(76, 175, 80, 0.1);
}

.tts-status.error {
    border-color: rgba(244, 67, 54, 0.5);
    background: rgba(244, 67, 54, 0.1);
}

/* Verbesserte Scrollbar-Styles */
.chat-messages::-webkit-scrollbar {
    width: 8px;
}

.chat-messages::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 4px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 4px;
    transition: background 0.3s ease;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* Firefox Scrollbar */
.chat-messages {
    scrollbar-width: thin;
    scrollbar-color: rgba(255, 255, 255, 0.2) transparent;
}

/* Focus-Indikatoren für Accessibility */
.btn:focus,
.tts-button:focus,
.theme-toggle:focus,
.logout-btn:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Hover-States für Touch-Geräte */
@media (hover: hover) {
    .message:hover .tts-button {
        opacity: 1;
    }
}

/* Professionelle Animationen */
@keyframes slideInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideInFromRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes slideInFromLeft {
    from {
        opacity: 0;
        transform: translateX(-30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.message {
    animation: fadeInUp 0.4s ease-out;
}

.message.user {
    animation: slideInFromRight 0.4s ease-out;
}

.message.assistant {
    animation: slideInFromLeft 0.4s ease-out;
}