body {
    font-family: 'Inter', sans-serif;
    background-color: #ffffff;
    color: #000000;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    padding: 40px 20px;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease;
    opacity: 0;
    animation: pageFadeIn 1s ease forwards;
}

@keyframes pageFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

body.dark-mode {
    background-color: #0a0a0a;
    color: #e0e0e0;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 80vw;
    max-width: 1200px;
    margin-bottom: 40px;
}

.headline {
    font-size: 2.5em;
    font-weight: 700;
    color: #1E88E5;
    margin: 0;
    transition: color 0.3s ease;
}

.dark-mode .headline {
    color: #ffffff;
}

#toggle-mode {
    background: none;
    border: none;
    color: #1E88E5;
    font-size: 1.5em;
    cursor: pointer;
    transition: color 0.3s ease;
}

.dark-mode #toggle-mode {
    color: #ffffff;
}

#toggle-mode:hover {
    opacity: 0.8;
}

.chat-wrapper {
    width: 80vw;
    max-width: 1200px;
}

.chat-container {
    position: relative;
    background: linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8)),
                url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="200" height="200" viewBox="0 0 200 200"%3E%3Crect width="200" height="200" fill="black"/%3E%3Ccircle cx="50" cy="50" r="1" fill="white" opacity="0.3"/%3E%3Ccircle cx="150" cy="80" r="0.8" fill="white" opacity="0.4"/%3E%3Ccircle cx="80" cy="120" r="0.6" fill="white" opacity="0.3"/%3E%3Ccircle cx="120" cy="30" r="0.5" fill="white" opacity="0.2"/%3E%3C/svg%3E');
    background-size: cover, 200px 200px;
    background-blend-mode: normal;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.15);
    height: 70vh;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.dark-mode .chat-container {
    background: linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8)),
                url('data:image/svg+xml,%3Csvg xmlns="http://www.w3.org/2000/svg" width="200" height="200" viewBox="0 0 200 200"%3E%3Crect width="200" height="200" fill="black"/%3E%3Ccircle cx="50" cy="50" r="1" fill="white" opacity="0.3"/%3E%3Ccircle cx="150" cy="80" r="0.8" fill="white" opacity="0.4"/%3E%3Ccircle cx="80" cy="120" r="0.6" fill="white" opacity="0.3"/%3E%3Ccircle cx="120" cy="30" r="0.5" fill="white" opacity="0.2"/%3E%3C/svg%3E');
    background-size: cover, 200px 200px;
    background-blend-mode: normal;
    box-shadow: 0 4px 20px rgba(255, 255, 255, 0.15);
}

.chat-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background: 
        radial-gradient(circle at 10% 20%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 90% 80%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 30% 40%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 70% 60%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 20% 70%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 80% 30%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 40% 10%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 60% 90%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 15% 50%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 85% 25%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 25% 85%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 75% 15%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 35% 65%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 65% 35%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 45% 55%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 55% 45%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 5% 95%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 95% 5%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 50% 20%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 20% 50%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 80% 70%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 70% 80%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 30% 30%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 60% 40%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 40% 60%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 50% 70%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 70% 50%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 20% 80%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 80% 20%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 10% 90%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 90% 10%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 25% 25%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 75% 75%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 15% 35%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 85% 65%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 35% 15%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 65% 85%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 45% 25%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 55% 75%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 25% 45%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 75% 55%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 5% 65%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 95% 35%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 15% 75%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 85% 25%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 35% 55%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 65% 45%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 45% 35%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 55% 65%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 30% 50%, grey 0.3px, transparent 0.31px);
    background-size: 100% 100%;
    opacity: 0.3;
    animation: float 10s linear infinite;
}

.chat-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    background: 
        radial-gradient(circle at 50% 50%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 20% 30%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 80% 70%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 30% 80%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 70% 20%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 40% 40%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 60% 60%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 10% 90%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 90% 10%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 25% 75%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 75% 25%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 15% 45%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 85% 55%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 35% 65%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 65% 35%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 45% 15%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 55% 85%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 20% 60%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 80% 40%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 30% 20%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 70% 80%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 40% 50%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 60% 30%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 50% 80%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 20% 70%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 80% 20%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 10% 60%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 90% 40%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 25% 55%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 75% 45%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 35% 25%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 65% 75%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 45% 35%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 55% 65%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 15% 85%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 85% 15%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 30% 70%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 70% 30%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 40% 80%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 60% 20%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 50% 10%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 20% 90%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 80% 50%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 10% 30%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 90% 70%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 25% 65%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 75% 35%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 35% 45%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 65% 55%, grey 0.3px, transparent 0.31px),
        radial-gradient(circle at 45% 75%, grey 0.3px, transparent 0.31px);
    background-size: 100% 100%;
    opacity: 0.25;
    animation: float 10s linear infinite;
    animation-delay: 5s;
}

@keyframes float {
    0% { transform: translate(0, 0); opacity: 0.3; }
    20% { transform: translate(calc(50vw * sin(0.9)), calc(35vh * cos(1.1))); opacity: 0.25; }
    40% { transform: translate(calc(40vw * cos(1.3)), calc(30vh * sin(0.8))); opacity: 0.2; }
    60% { transform: translate(calc(45vw * sin(1.4)), calc(25vh * cos(0.9))); opacity: 0.25; }
    80% { transform: translate(calc(35vw * cos(1.2)), calc(30vh * sin(1.5))); opacity: 0.2; }
    100% { transform: translate(calc(40vw * sin(1.2)), calc(35vh * cos(0.8))); opacity: 0.3; }
}

.chat-messages {
    flex: 1;
    padding: 24px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    font-size: 14px;
    line-height: 1.5;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.chat-messages::-webkit-scrollbar {
    display: none;
}

.message {
    max-width: 100%;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    background-color: rgba(232, 232, 232, 0.9);
    color: #000000;
    align-self: flex-start;
    width: fit-content;
    opacity: 0;
    animation: fadeIn 0.5s ease forwards;
}

.dark-mode .message {
    background-color: rgba(42, 42, 42, 0.9);
    color: #e0e0e0;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.sender {
    font-weight: 600;
    margin-bottom: 4px;
    font-size: 0.9em;
    color: #4a90e2;
    display: flex;
    align-items: center;
    gap: 8px;
}

.sender.console {
    color: #FFD700;
}

.sender .timestamp {
    font-size: 0.7em;
    color: #808080;
    font-weight: 400;
}

.dark-mode .sender .timestamp {
    color: #a0a0a0;
}

.loading-message {
    padding: 4px 16px;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 8px;
    opacity: 1;
    min-height: 0;
}

.loading-message.fade-out {
    animation: fadeOut 0.5s ease forwards;
}

@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; }
}

.loading-message .sender {
    margin-bottom: 0;
}

.loading-message .spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(74, 144, 226, 0.3);
    border-radius: 50%;
    border-top-color: #4a90e2;
    animation: spin 1s linear infinite;
}

.dark-mode .loading-message .spinner {
    border-color: rgba(255, 255, 255, 0.3);
    border-top-color: #ffffff;
}

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

.chat-input {
    display: flex;
    padding: 16px;
    background-color: rgba(240, 240, 240, 0.9);
    align-items: center;
    transition: background-color 0.3s ease;
}

.dark-mode .chat-input {
    background-color: rgba(26, 26, 26, 0.9);
}

#nickname-input,
#user-input {
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background-color: #ffffff;
    color: #000000;
    margin-right: 12px;
    height: 48px;
    line-height: 1.5;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease;
}

#nickname-input {
    width: 160px;
}

#user-input {
    flex: 1;
    resize: none;
    overflow: hidden;
}

.dark-mode #nickname-input,
.dark-mode #user-input {
    background-color: #2a2a2a;
    color: #e0e0e0;
}

#user-input:disabled {
    background-color: #e0e0e0;
    color: #a0a0a0;
    cursor: not-allowed;
}

.dark-mode #user-input:disabled {
    background-color: #3a3a3a;
    color: #808080;
}

#send-button {
    padding: 12px;
    background-color: #4a90e2;
    color: #ffffff;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease;
}

#send-button:disabled {
    background-color: #a0a0a0;
    cursor: not-allowed;
}

#send-button:hover:not(:disabled) {
    background-color: #357abd;
}

.footer {
    margin-top: 40px;
    font-size: 0.8em;
    color: #808080;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.dark-mode .footer {
    color: #a0a0a0;
}

.legacy-link {
    font-size: 0.7em;
    color: #4a90e2;
    text-decoration: none;
    margin-top: 8px;
}

.legacy-link:hover {
    text-decoration: underline;
}

.coming-soon {
    font-size: 0.7em;
    color: #808080;
    margin-top: 8px;
}

.dark-mode .coming-soon {
    color: #a0a0a0;
}