:root {
    /* Color Palette */
    --bg-dark: #0f172a;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --secondary: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    
    /* Gradients */
    --gradient-blob-1: radial-gradient(circle, rgba(59,130,246,0.3) 0%, rgba(15,23,42,0) 70%);
    --gradient-blob-2: radial-gradient(circle, rgba(139,92,246,0.3) 0%, rgba(15,23,42,0) 70%);
    --gradient-blob-3: radial-gradient(circle, rgba(16,185,129,0.2) 0%, rgba(15,23,42,0) 70%);
    
    /* Layout & Effects */
    --glass-bg: rgba(30, 41, 59, 0.6);
    --glass-border: rgba(255, 255, 255, 0.08);
    --bot-msg-bg: rgba(51, 65, 85, 0.8);
    --user-msg-bg: var(--primary);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    overflow: hidden;
    position: relative;
}

/* Dynamic Animated Background */
.app-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    overflow: hidden;
    pointer-events: none;
}

.blob {
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(80px);
    animation: float 20s infinite alternate ease-in-out;
}

.blob-1 { top: -20%; left: -10%; background: var(--gradient-blob-1); animation-delay: 0s; }
.blob-2 { bottom: -20%; right: -10%; background: var(--gradient-blob-2); animation-delay: -5s; }
.blob-3 { top: 40%; left: 40%; background: var(--gradient-blob-3); animation-delay: -10s; }

@keyframes float {
    0% { transform: translate(0, 0) scale(1); }
    50% { transform: translate(100px, 50px) scale(1.1); }
    100% { transform: translate(-50px, 150px) scale(0.9); }
}

/* Chat Layout Containers */
.chat-container {
    position: relative;
    z-index: 10;
    width: 100%;
    max-width: 900px;
    height: 90vh;
    display: flex;
    flex-direction: column;
    /* Glassmorphism Effect */
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    overflow: hidden;
}

/* Header */
.chat-header {
    padding: 20px 30px;
    border-bottom: 1px solid var(--glass-border);
    background: rgba(30, 41, 59, 0.4);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.upload-resume-btn {
    display: flex;
    align-items: center;
    gap: 7px;
    text-decoration: none;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--glass-border);
    padding: 8px 14px;
    border-radius: 100px;
    transition: color 0.2s, background 0.2s, border-color 0.2s;
    white-space: nowrap;
}
.upload-resume-btn:hover {
    color: var(--text-main);
    background: rgba(59,130,246,0.12);
    border-color: rgba(59,130,246,0.4);
}

.chat-header h1 {
    font-size: 1.25rem;
    font-weight: 600;
    letter-spacing: -0.025em;
}

.status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-top: 4px;
}

.status-indicator {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: #10b981;
}

.status-indicator.bubble {
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.4); }
    70% { box-shadow: 0 0 0 6px rgba(16, 185, 129, 0); }
    100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0); }
}

/* Chat History Area */
.chat-history {
    flex-grow: 1;
    padding: 30px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 24px;
    scroll-behavior: smooth;
}

/* Custom Scrollbar for Chat History */
.chat-history::-webkit-scrollbar {
    width: 8px;
}

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

.chat-history::-webkit-scrollbar-thumb {
    background: var(--glass-border);
    border-radius: 10px;
}
.chat-history::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* Message Bubbles */
.message {
    display: flex;
    align-items: flex-end;
    gap: 12px;
    max-width: 85%;
    animation: slideIn 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
    opacity: 0;
    transform: translateY(10px);
}

@keyframes slideIn {
    to { opacity: 1; transform: translateY(0); }
}

.message-content {
    padding: 14px 20px;
    font-size: 0.95rem;
    line-height: 1.6;
    border-radius: 18px;
    word-break: break-word;
}

/* ── Markdown content inside bot message bubbles ── */
.message-content p {
    margin-bottom: 0.55em;
}
.message-content p:last-child { margin-bottom: 0; }

/* Headings */
.message-content h1,
.message-content h2,
.message-content h3 {
    font-weight: 700;
    margin: 0.8em 0 0.3em;
    line-height: 1.3;
    color: #e2e8f0;
}
.message-content h1 { font-size: 1.15rem; }
.message-content h2 { font-size: 1.05rem; }
.message-content h3 { font-size: 0.97rem; }

/* Lists */
.message-content ul,
.message-content ol {
    padding-left: 1.4em;
    margin: 0.4em 0 0.6em;
    display: flex;
    flex-direction: column;
    gap: 4px;
}
.message-content ul { list-style: disc; }
.message-content ol { list-style: decimal; }
.message-content li {
    line-height: 1.55;
}

/* Inline code & code blocks */
.message-content code {
    font-family: 'Fira Code', 'Courier New', monospace;
    font-size: 0.875em;
    background: rgba(0, 0, 0, 0.35);
    color: #a5f3fc;
    padding: 2px 6px;
    border-radius: 5px;
}
.message-content pre {
    background: rgba(0, 0, 0, 0.45);
    border: 1px solid rgba(255,255,255,0.08);
    padding: 12px 16px;
    border-radius: 10px;
    overflow-x: auto;
    margin: 8px 0;
}
.message-content pre code {
    background: transparent;
    color: #e2e8f0;
    padding: 0;
    font-size: 0.85em;
}

/* Bold & italic */
.message-content strong { color: #f0f9ff; font-weight: 700; }
.message-content em { font-style: italic; color: #bae6fd; }

/* Blockquote */
.message-content blockquote {
    border-left: 3px solid #6366f1;
    padding: 6px 14px;
    margin: 8px 0;
    color: var(--text-muted);
    background: rgba(99, 102, 241, 0.08);
    border-radius: 0 8px 8px 0;
    font-style: italic;
}

/* Horizontal rule */
.message-content hr {
    border: none;
    border-top: 1px solid var(--glass-border);
    margin: 10px 0;
}

/* AI Message Styling */
.ai-message {
    align-self: flex-start;
}

.ai-message .avatar {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, #6366f1, #8b5cf6);
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 600;
    font-size: 0.8rem;
    flex-shrink: 0;
}

.ai-message .message-content {
    background-color: var(--bot-msg-bg);
    border-bottom-left-radius: 4px;
    border: 1px solid var(--glass-border);
}

/* User Message Styling */
.user-message {
    align-self: flex-end;
    flex-direction: row-reverse;
}

.user-message .message-content {
    background-color: var(--user-msg-bg);
    border-bottom-right-radius: 4px;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.4);
}

/* Footer / Input Area */
.chat-footer {
    padding: 20px 30px;
    background: rgba(30, 41, 59, 0.5);
    border-top: 1px solid var(--glass-border);
}

#chat-form {
    display: flex;
    gap: 12px;
    align-items: center;
    background: rgba(15, 23, 42, 0.6);
    padding: 8px;
    border-radius: 100px;
    border: 1px solid var(--glass-border);
    transition: border-color 0.3s;
}

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

#user-input {
    flex-grow: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-size: 1rem;
    padding: 12px 20px;
    font-family: inherit;
    outline: none;
}

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

#send-btn {
    background: var(--primary);
    color: white;
    border: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    transition: background 0.3s, transform 0.2s;
    flex-shrink: 0;
}

#send-btn:hover {
    background: var(--primary-hover);
    transform: scale(1.05);
}

#send-btn:active {
    transform: scale(0.95);
}

#send-btn:disabled {
    background: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

/* Loading Dots Indicator */
.typing-indicator span {
    display: inline-block;
    width: 6px;
    height: 6px;
    background-color: var(--text-main);
    border-radius: 50%;
    margin: 0 2px;
    animation: bounce 1.4s infinite ease-in-out both;
}

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

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

/* Responsive adjustments */
@media (max-width: 768px) {
    .chat-container {
        height: 100vh;
        border-radius: 0;
        border: none;
    }
    
    .chat-history { padding: 20px; }
    .chat-footer { padding: 15px 20px; }
    
    .message { max-width: 95%; }
}