:root {
    --bg-color: #0f172a;
    --panel-bg: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #10b981; 
    --accent-hover: #059669;
    --user-msg-bg: #3b82f6; 
    --sys-msg-bg: #334155;
    --font-family: 'Inter', sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-primary);
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.app-container {
    width: 100%;
    max-width: 600px;
    height: 90vh;
    background-color: var(--panel-bg);
    border-radius: 20px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.app-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #3b82f6, var(--accent-color));
}

.chat-wrapper {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chat-header {
    padding: 20px;
    text-align: center;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.chat-header h1 {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(90deg, #f8fafc, var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 5px;
}

.chat-header p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.chat-controls {
    padding: 15px 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.chat-controls label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.chat-controls select {
    flex: 1;
    background-color: var(--sys-msg-bg);
    color: var(--text-primary);
    border: none;
    padding: 8px 12px;
    border-radius: 8px;
    font-family: var(--font-family);
    outline: none;
    cursor: pointer;
    transition: background 0.2s;
}

.chat-controls select:hover {
    background-color: #475569;
}

.chat-box {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
    scroll-behavior: smooth;
}

.chat-box::-webkit-scrollbar {
    width: 6px;
}
.chat-box::-webkit-scrollbar-thumb {
    background: #475569;
    border-radius: 10px;
}

.message {
    display: flex;
    gap: 10px;
    max-width: 95%;
    animation: fadeIn 0.3s ease-out forwards;
}

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

.message.user-msg {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.message .avatar {
    width: 35px;
    height: 35px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 0.8rem;
    font-weight: bold;
    flex-shrink: 0;
}

.system-msg .avatar {
    background-color: var(--accent-color);
    color: #fff;
}

.user-msg .avatar {
    background-color: var(--user-msg-bg);
    color: #fff;
}

.message .bubble {
    padding: 12px 16px;
    border-radius: 16px;
    font-size: 0.95rem;
    line-height: 1.4;
}

.system-msg .bubble {
    background-color: var(--sys-msg-bg);
    border-top-left-radius: 4px;
}

.user-msg .bubble {
    background-color: var(--user-msg-bg);
    border-top-right-radius: 4px;
}

.chat-input-area {
    padding: 20px;
    display: flex;
    gap: 10px;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.chat-input-area input {
    flex: 1;
    background-color: var(--sys-msg-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 12px 20px;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: 0.95rem;
    outline: none;
    transition: border-color 0.2s;
}

.chat-input-area input:focus {
    border-color: var(--accent-color);
}

.chat-input-area button {
    background-color: var(--accent-color);
    color: white;
    border: none;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: transform 0.2s, background-color 0.2s;
}

.chat-input-area button:hover {
    background-color: var(--accent-hover);
    transform: scale(1.05);
}

.chat-input-area button svg {
    width: 20px;
    height: 20px;
}

.typing-indicator {
    display: flex;
    gap: 4px;
    padding: 15px 20px;
    background-color: var(--sys-msg-bg);
    border-radius: 16px;
    border-top-left-radius: 4px;
    align-self: flex-start;
    width: max-content;
}

.typing-indicator span {
    width: 6px;
    height: 6px;
    background-color: var(--text-secondary);
    border-radius: 50%;
    animation: blink 1.4s infinite both;
}

.typing-indicator span:nth-child(1) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(2) { animation-delay: 0.4s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.6s; }

@keyframes blink {
    0% { opacity: 0.2; }
    20% { opacity: 1; }
    100% { opacity: 0.2; }
}

@media (max-width: 600px) {
    .app-container {
        height: 100vh;
        border-radius: 0;
    }
}

/* Select2 Dark Theme Overrides */
.select2-container--default .select2-selection--single {
    background-color: var(--sys-msg-bg);
    border: none;
    border-radius: 8px;
    height: 38px;
    display: flex;
    align-items: center;
}

.select2-container--default .select2-selection--single .select2-selection__rendered {
    color: var(--text-primary);
    line-height: normal;
    padding-left: 12px;
}

.select2-container--default .select2-selection--single .select2-selection__arrow {
    height: 36px;
}

.select2-dropdown {
    background-color: var(--sys-msg-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
}

.select2-search--dropdown .select2-search__field {
    background-color: var(--panel-bg);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 4px;
    outline: none;
}

.select2-search--dropdown .select2-search__field:focus {
    border-color: var(--accent-color);
}

.select2-container--default .select2-results__option--selected {
    background-color: #475569;
}

.select2-container--default .select2-results__option--highlighted.select2-results__option--selectable {
    background-color: var(--accent-color);
    color: white;
}