:root {
    --bg-color: #0d0f12;
    --chat-bg: #15181e;
    --primary-color: #3b82f6;
    --primary-hover: #2563eb;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #2e3340;
    --bot-msg-bg: #1e222b;
    --user-msg-bg: var(--primary-color);
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 1rem;
}

.chat-container {
    width: 100%;
    max-width: 450px;
    height: 85vh;
    max-height: 800px;
    background-color: var(--chat-bg);
    border-radius: 20px;
    box-shadow: var(--shadow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

/* Header */
.chat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem;
    background: linear-gradient(to bottom, rgba(30,34,43,0.8), rgba(21,24,30,0.9));
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    z-index: 10;
}

.header-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.avatar {
    position: relative;
    width: 44px;
    height: 44px;
    background-color: rgba(59, 130, 246, 0.2);
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    color: var(--primary-color);
}

.status-indicator {
    position: absolute;
    bottom: 2px;
    right: 2px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 2px solid var(--chat-bg);
}

.status-indicator.online {
    background-color: #10b981;
}

.header-info h1 {
    font-size: 1rem;
    font-weight: 600;
}

.status-text {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.settings-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition);
}

.settings-btn:hover {
    color: var(--text-main);
}

/* Messages Area */
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    scroll-behavior: smooth;
}

/* Scrollbar Styling */
.chat-messages::-webkit-scrollbar {
    width: 6px;
}
.chat-messages::-webkit-scrollbar-track {
    background: transparent;
}
.chat-messages::-webkit-scrollbar-thumb {
    background-color: var(--border-color);
    border-radius: 10px;
}

.message {
    display: flex;
    flex-direction: column;
    max-width: 85%;
    animation: fadeIn 0.3s ease-out;
}

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

.bot-message {
    align-self: flex-start;
}

.user-message {
    align-self: flex-end;
}

.message-content {
    padding: 0.875rem 1rem;
    border-radius: 18px;
    font-size: 0.95rem;
    line-height: 1.5;
    word-wrap: break-word;
}

.bot-message .message-content {
    background-color: var(--bot-msg-bg);
    border-bottom-left-radius: 4px;
}

.user-message .message-content {
    background-color: var(--user-msg-bg);
    color: white;
    border-bottom-right-radius: 4px;
}

.timestamp {
    font-size: 0.7rem;
    color: var(--text-muted);
    margin-top: 0.3rem;
    margin-left: 0.5rem;
    margin-right: 0.5rem;
}

.bot-message .timestamp {
    align-self: flex-start;
}

.user-message .timestamp {
    align-self: flex-end;
}

/* Typing Indicator */
.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 0.875rem 1rem;
    background-color: var(--bot-msg-bg);
    border-radius: 18px;
    border-bottom-left-radius: 4px;
    width: fit-content;
    align-self: flex-start;
    animation: fadeIn 0.3s ease-out;
}

.dot {
    width: 6px;
    height: 6px;
    background-color: var(--text-muted);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out both;
}

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

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

/* Error Message */
.error-message .message-content {
    background-color: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

/* Input Area */
.chat-input-area {
    padding: 1.25rem;
    background-color: var(--chat-bg);
    border-top: 1px solid var(--border-color);
}

.input-wrapper {
    display: flex;
    align-items: center;
    background-color: #1e222b;
    border-radius: 24px;
    padding: 0.5rem 0.5rem 0.5rem 1.25rem;
    border: 1px solid transparent;
    transition: var(--transition);
}

.input-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(59, 130, 246, 0.2);
}

#message-input {
    flex: 1;
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1rem;
    font-family: inherit;
    outline: none;
}

#message-input::placeholder {
    color: var(--text-muted);
}

#send-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
}

#send-button:disabled {
    background-color: #2e3340;
    color: var(--text-muted);
    cursor: not-allowed;
}

#send-button:not(:disabled):hover {
    background-color: var(--primary-hover);
    transform: scale(1.05);
}

/* Responsive */
@media (max-width: 480px) {
    .chat-container {
        height: 100vh;
        max-height: 100vh;
        border-radius: 0;
        border: none;
    }
}