/* ==========================================================================
   MANIT Chat — Sleek Minimalist Stylesheet
   ========================================================================== */

/* --- Theme Variables --- */
:root {
    --bg-primary: #FFFFFF;
    --text-primary: #000000;
    --bg-secondary: #F3F4F6;
    --border-color: #E5E7EB;
    --placeholder-color: #9CA3AF;
    --max-width: 768px;
    --transition-speed: 0.2s;
    --font-ui: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-heading: 'Caveat', cursive;
}

/* --- Base Resets & Layout --- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100dvh;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    font-family: var(--font-ui);
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* --- Layout Container --- */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    background-color: var(--bg-primary);
    position: relative;
}

/* --- Header Section --- */
.app-header {
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-bottom: 1px solid var(--bg-secondary);
    padding: 0 24px;
    background-color: var(--bg-primary);
    z-index: 10;
}

.header-content {
    text-align: center;
}

.header-title {
    font-family: var(--font-heading);
    font-size: 2.4rem;
    font-weight: 700;
    line-height: 1;
    letter-spacing: -0.01em;
}

.header-subtitle {
    font-size: 0.72rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: #4B5563;
    margin-top: 4px;
}

/* --- Chat Scroll Area --- */
.chat-area {
    flex: 1;
    overflow-y: auto;
    padding: 24px;
    scroll-behavior: smooth;
    display: flex;
    flex-direction: column;
}

/* Custom Minimalist Scrollbar */
.chat-area::-webkit-scrollbar {
    width: 6px;
}

.chat-area::-webkit-scrollbar-track {
    background: transparent;
}

.chat-area::-webkit-scrollbar-thumb {
    background: #E5E7EB;
    border-radius: 9999px;
}

.chat-area::-webkit-scrollbar-thumb:hover {
    background: #D1D5DB;
}

/* Chat inner wrapper to help layout flow */
.chat-wrapper {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin-top: auto; /* Pushes content down if chat list is short */
    justify-content: flex-end;
}

/* --- Message Bubbles --- */
.message {
    max-width: 85%;
    font-size: 0.95rem;
    line-height: 1.6;
    animation: fadeInUp 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
    transform: translateY(8px);
}

.message-content {
    word-break: break-word;
    white-space: pre-wrap;
}

.bot-message .message-content {
    white-space: normal;
}

/* --- Markdown Styling in Bot Messages --- */
.bot-message .message-content p {
    margin-bottom: 0.8em;
}
.bot-message .message-content p:last-child {
    margin-bottom: 0;
}

.bot-message .message-content ul, 
.bot-message .message-content ol {
    margin-bottom: 0.8em;
    padding-left: 20px;
}

.bot-message .message-content li {
    margin-bottom: 0.4em;
    list-style-position: outside;
}

.bot-message .message-content li:last-child {
    margin-bottom: 0;
}

.bot-message .message-content ul {
    list-style-type: disc;
}

.bot-message .message-content ul ul {
    list-style-type: circle;
    margin-top: 0.4em;
    margin-bottom: 0;
}

.bot-message .message-content ul ul ul {
    list-style-type: square;
}

.bot-message .message-content ol {
    list-style-type: decimal;
}

.bot-message .message-content h1,
.bot-message .message-content h2,
.bot-message .message-content h3,
.bot-message .message-content h4,
.bot-message .message-content h5,
.bot-message .message-content h6 {
    margin-top: 1em;
    margin-bottom: 0.5em;
    font-weight: 600;
    line-height: 1.25;
}

.bot-message .message-content a {
    color: #2563EB;
    text-decoration: underline;
}

.bot-message .message-content a:hover {
    color: #1D4ED8;
}

.bot-message .message-content blockquote {
    border-left: 4px solid var(--border-color);
    padding-left: 12px;
    color: #4B5563;
    font-style: italic;
    margin-bottom: 0.8em;
}

.bot-message .message-content code {
    background-color: var(--bg-secondary);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.9em;
}

.bot-message .message-content pre {
    background-color: var(--bg-secondary);
    padding: 12px;
    border-radius: 8px;
    overflow-x: auto;
    margin-bottom: 0.8em;
}

.bot-message .message-content pre code {
    background-color: transparent;
    padding: 0;
    border-radius: 0;
}

/* --- Markdown Tables --- */
.bot-message .message-content table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 0.8em;
    margin-bottom: 0.8em;
    font-size: 0.9em;
}

.bot-message .message-content th,
.bot-message .message-content td {
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    text-align: left;
}

.bot-message .message-content th {
    background-color: var(--bg-secondary);
    font-weight: 600;
}

.bot-message .message-content tr:nth-child(even) {
    background-color: rgba(0, 0, 0, 0.02);
}

/* --- Markdown Images --- */
.bot-message .message-content img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin: 8px 0;
}


/* User Message Specifics */
.user-message {
    align-self: flex-end;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-radius: 18px 18px 4px 18px;
    padding: 12px 18px;
    max-width: 75%;
}

/* Bot Message Specifics */
.bot-message {
    align-self: flex-start;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    border: none;
    padding: 12px 0;
    max-width: 88%;
}

/* Cursive Accent within Bot Responses (e.g. key subheaders) */
.bot-message .academic-quote,
.bot-message .academic-heading {
    font-family: var(--font-heading);
    font-size: 1.55rem;
    display: block;
    margin: 14px 0 6px 0;
    line-height: 1.2;
    font-weight: 700;
}

.bot-message .academic-heading:first-child {
    margin-top: 0;
}

/* --- Typing Stream Effect --- */
.typing::after {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    background-color: var(--text-primary);
    border-radius: 50%;
    margin-left: 5px;
    animation: blink 0.75s step-end infinite;
    vertical-align: middle;
}

@keyframes blink {
    from, to { opacity: 0; }
    50% { opacity: 1; }
}

/* --- Loading Indicator --- */
.loading-bubble {
    align-self: flex-start;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 0;
    color: var(--text-primary);
    font-family: var(--font-ui);
    font-size: 0.9rem;
}

.loading-dots {
    display: flex;
    gap: 4px;
    margin-right: 6px;
}

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

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

.loading-text-span {
    font-style: italic;
    opacity: 0.6;
    transition: opacity 0.3s ease-in-out;
}

.loading-text-span.fade-out {
    opacity: 0;
}

/* --- Bottom Input Area --- */
.input-area {
    padding: 16px 24px 28px 24px;
    background-color: var(--bg-primary);
}

.input-form {
    display: flex;
    align-items: center;
    background-color: var(--bg-secondary);
    border-radius: 9999px;
    padding: 4px 6px 4px 18px;
    border: 1.5px solid transparent;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
}

.input-form:focus-within {
    border-color: var(--text-primary);
    background-color: var(--bg-primary);
    box-shadow: 0 0 0 1px var(--text-primary);
}

.chat-input {
    flex: 1;
    border: none;
    background: transparent;
    outline: none;
    padding: 12px 0;
    font-family: var(--font-ui);
    font-size: 0.95rem;
    color: var(--text-primary);
}

.chat-input::placeholder {
    color: var(--placeholder-color);
    font-weight: 400;
}

.send-button {
    background: transparent;
    border: none;
    outline: none;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--text-primary);
    opacity: 0.35;
    transition: opacity var(--transition-speed), transform var(--transition-speed), background-color var(--transition-speed);
}

.input-form:focus-within .send-button,
.send-button.active {
    opacity: 1;
}

.send-button:hover {
    transform: scale(1.05);
    background-color: rgba(0, 0, 0, 0.04);
}

.send-button:active {
    transform: scale(0.95);
}

.send-icon {
    width: 18px;
    height: 18px;
    transform: rotate(0deg);
    transition: transform var(--transition-speed);
}

.send-button:hover .send-icon {
    transform: translate(2px, -2px);
}

/* --- Animations --- */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulseDot {
    0%, 80%, 100% { 
        transform: scale(0);
        opacity: 0.3;
    } 
    40% { 
        transform: scale(1.0);
        opacity: 1;
    }
}

/* --- Responsive Adjustments --- */
@media (max-width: 640px) {
    .app-header {
        height: 72px;
    }
    .header-title {
        font-size: 2.1rem;
    }
    .chat-area {
        padding: 16px;
    }
    .input-area {
        padding: 12px 16px 20px 16px;
    }
    .message {
        max-width: 90%;
    }
}