/* --- Base & Variables --- */
:root {
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    
    /* Light Theme */
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --text-muted-color: #64748b;
    --header-bg-color: #ffffff;
    --border-color: #e2e8f0;
    --input-bg-color: #f1f5f9;
    --input-border-color: #cbd5e1;
    --primary-color: #2563eb;
    --primary-hover-color: #1d4ed8;
    --user-bubble-bg: #2563eb;
    --user-bubble-text: #ffffff;
    --bot-bubble-bg: #ffffff;
    --bot-bubble-text: #334155;
    --bot-avatar-bg: #dbeafe;
    --bot-avatar-text: #2563eb;
    --debug-bg: #f1f5f9;
    --debug-header-bg: #e2e8f0;
    --theme-toggle-hover-bg: #f1f5f9;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
}

html.dark {
    /* Mistral Dark Theme */
    --bg-color: #1E1E1E;
    --text-color: #E9E2CB;
    --text-muted-color: #FFF0C3;
    --header-bg-color: #1E1E1E;
    --border-color: #4a4a4a;
    --input-bg-color: #333333;
    --input-border-color: #4a4a4a;
    --primary-color: #FA500F;
    --primary-hover-color: #E1470D;
    --user-bubble-bg: #FA500F;
    --user-bubble-text: #ffffff;
    --bot-bubble-bg: #2a2a2a;
    --bot-bubble-text: #E9E2CB;
    --bot-avatar-bg: #FA500F;
    --bot-avatar-text: #1E1E1E;
    --debug-bg: #000000;
    --debug-header-bg: #333333;
    --debug-text: #00ff00;
    --theme-toggle-hover-bg: #333333;
    --shadow: 0 1px 3px 0 rgb(0 0 0 / 0.2), 0 1px 2px -1px rgb(0 0 0 / 0.2);
}

/* --- General --- */
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-sans);
    display: flex;
    flex-direction: column;
    height: 100vh;
    margin: 0;
}

button {
    cursor: pointer;
    transition: background-color 0.2s, color 0.2s, opacity 0.2s;
}
button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* --- Header --- */
.header {
    background-color: var(--header-bg-color);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    box-shadow: var(--shadow);
    z-index: 10;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.header-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.header-logo {
    width: 2rem;
    height: 2rem;
    background-color: var(--primary-color);
    color: white;
    border-radius: 0.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
}
.header-title h1 {
    font-weight: bold;
    font-size: 1.125rem;
    color: var(--text-color);
    margin: 0;
}
.theme-toggle-btn {
    background: none;
    border: none;
    color: var(--text-muted-color);
    margin-left: 1rem;
    padding: 0.5rem;
    border-radius: 0.5rem;
}
.theme-toggle-btn:hover {
    background-color: var(--theme-toggle-hover-bg);
}
.header-controls {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}
.model-select, .custom-model-input {
    background-color: var(--input-bg-color);
    border: 1px solid var(--input-border-color);
    color: var(--text-color);
    font-size: 0.875rem;
    border-radius: 0.5rem;
    padding: 0.625rem;
    outline: none;
    transition: border-color 0.2s;
    width: 100%;
}
.custom-model-input.hidden {
    display: none;
}
.action-btn {
    color: white;
    background-color: var(--primary-color);
    font-weight: 500;
    border-radius: 0.5rem;
    font-size: 0.875rem;
    padding: 0.625rem 1.25rem;
    text-align: center;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    border: none;
}
.action-btn:hover {
    background-color: var(--primary-hover-color);
}
.action-btn.success {
    background-color: #22c55e;
}
.action-btn.success:hover {
    background-color: #16a34a;
}
.action-btn.error {
    background-color: #ef4444;
}
.action-btn.error:hover {
    background-color: #dc2626;
}

/* --- Main Chat Area --- */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    scroll-behavior: smooth;
}
.message-wrapper {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    max-width: 48rem;
    width: 100%; /* Ensure it takes full width for margin auto to work */
}
.message-wrapper.user {
    flex-direction: row-reverse;
    margin-left: auto; /* Push to the right */
}
.message-wrapper.assistant {
    margin-right: auto; /* Push to the left (default for flex-start items) */
}
.avatar {
    width: 2rem;
    height: 2rem;
    border-radius: 9999px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-top: 0.25rem;
}
.avatar.user {
    background-color: #334155; /* slate-700 */
    color: white;
}
.avatar.assistant {
    background-color: var(--bot-avatar-bg);
    color: var(--bot-avatar-text);
}
html.dark .avatar.assistant {
    opacity: 0.8;
}
.message-bubble {
    padding: 1rem 1.5rem;
    border-radius: 1.125rem;
    box-shadow: var(--shadow);
    line-height: 1.625;
    word-wrap: break-word;
}
.message-bubble.user {
    background-color: var(--user-bubble-bg);
    color: var(--user-bubble-text);
    border-top-right-radius: 0;
}
.message-bubble.assistant {
    background-color: var(--bot-bubble-bg);
    color: var(--bot-bubble-text);
    border: 1px solid var(--border-color);
    border-top-left-radius: 0;
}
.message-bubble img {
    width: 12rem;
    height: 12rem;
    object-fit: cover;
    border-radius: 0.5rem;
    margin-bottom: 0.5rem;
}

/* --- Footer / Input Area --- */
.footer {
    background-color: var(--header-bg-color);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
}
.input-area {
    max-width: 48rem;
    margin-left: auto;
    margin-right: auto;
    position: relative;
}
.input-wrapper {
    display: flex;
    align-items: flex-end;
    gap: 0.5rem;
    background-color: var(--input-bg-color);
    border: 1px solid var(--input-border-color);
    border-radius: 0.75rem;
    padding: 0.5rem;
    box-shadow: var(--shadow);
    transition: all 0.2s;
}
.input-wrapper:focus-within {
    --tw-ring-offset-shadow: var(--tw-ring-inset) 0 0 0 var(--tw-ring-offset-width) var(--tw-ring-offset-color);
    --tw-ring-shadow: var(--tw-ring-inset) 0 0 0 calc(2px + var(--tw-ring-offset-width)) var(--tw-ring-color);
    box-shadow: var(--tw-ring-offset-shadow), var(--tw-ring-shadow), var(--shadow, 0 0 #0000) !important;
    --tw-ring-color: #dbeafe;
    border-color: #60a5fa;
}
.icon-btn {
    background: none;
    border: none;
    color: var(--text-muted-color);
    padding: 0.625rem;
    height: 2.5rem;
    width: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.25rem;
    border-radius: 0.5rem;
}
.icon-btn:hover {
    background-color: var(--bg-color);
    color: var(--primary-color);
}
.message-input {
    width: 100%;
    background-color: transparent;
    border: none;
    color: var(--text-color);
    resize: none;
    padding: 0.75rem 0.5rem;
    max-height: 8rem;
    outline: none;
}
.message-input::placeholder {
    color: var(--text-muted-color);
}
.send-btn {
    background-color: var(--primary-color);
    color: white;
    height: 2.5rem;
    width: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0.25rem;
    border-radius: 0.5rem;
    border: none;
}
.send-btn:hover {
    background-color: var(--primary-hover-color);
}
.image-preview-container {
    margin-bottom: 0.5rem;
    position: relative;
    width: 6rem;
    height: 6rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    box-shadow: var(--shadow);
}
.image-preview-container.hidden {
    display: none;
}
.image-preview {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 0.5rem;
}
.remove-image-btn {
    position: absolute;
    top: -0.5rem;
    right: -0.5rem;
    background-color: #ef4444;
    color: white;
    width: 1.5rem;
    height: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 9999px;
    border: none;
}
.remove-image-btn:hover {
    background-color: #dc2626;
}
.footer-text {
    text-align: center;
    margin-top: 0.5rem;
}
.footer-text p {
    font-size: 0.75rem;
    color: var(--text-muted-color);
    margin: 0;
}
#image-upload-input.hidden {
    display: none;
}

/* --- Status & Debug --- */
.status-bar {
    padding: 0.25rem 1rem;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted-color);
    background-color: var(--header-bg-color);
    border-top: 1px solid var(--border-color);
}
.status-bar.hidden {
    display: none;
}
.debug-toggle {
    width: 100%;
    text-align: left;
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-family: 'Courier New', Courier, monospace;
    color: var(--text-muted-color);
    background-color: var(--debug-header-bg);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: none;
}
.debug-toggle:hover {
    background-color: var(--input-bg-color);
}
#debug-arrow.rotate-180 {
    transform: rotate(180deg);
}
.debug-console {
    background-color: var(--debug-bg);
    color: var(--debug-text);
    height: 8rem;
    overflow-y: auto;
    padding: 1rem;
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}
.debug-console.hidden {
    display: none;
}

/* --- Custom Scrollbar --- */
.chat-container::-webkit-scrollbar {
    width: 8px;
}
.chat-container::-webkit-scrollbar-track {
    background: var(--bg-color);
}
.chat-container::-webkit-scrollbar-thumb {
    background: var(--input-border-color);
    border-radius: 4px;
}
.chat-container::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted-color);
}

/* --- Media Queries --- */
@media (min-width: 768px) {
    .header {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
    .header-controls {
        flex-direction: row;
        width: auto;
    }
    .model-select {
        width: 18rem;
    }
    .custom-model-input {
        width: 12rem;
    }
    .chat-container {
        padding: 2rem;
    }
}