/* =========================
   RESET & BASE STYLES
========================= */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Arial, sans-serif;
    background: #f4f7fa;
    color: #333;
    line-height: 1.5;
}

/* =========================
   DASHBOARD LAYOUT
========================= */
.dashboard-layout {
    display: flex;
    min-height: 100vh;
}

/* =========================
   SIDEBAR
========================= */
.sidebar {
    width: 260px;
    background: linear-gradient(180deg, #0f172a, #1e293b);
    color: white;
    padding: 25px 18px;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    overflow-y: auto;
}

.sidebar h2 {
    text-align: center;
    font-size: 24px;
    margin-bottom: 25px;
    letter-spacing: 1px;
}

.sidebar ul {
    list-style: none;
}

.sidebar ul li {
    padding: 12px 14px;
    margin-bottom: 10px;
    border-radius: 10px;
    cursor: pointer;
    transition: 0.25s ease;
    position: relative;
}

.sidebar ul li:hover {
    background: rgba(255, 255, 255, 0.12);
    transform: translateX(4px);
}

/* active indicator */
.sidebar ul li::before {
    content: "";
    position: absolute;
    left: 0;
    top: 0;
    width: 4px;
    height: 100%;
    background: #00c6ff;
    transform: scaleY(0);
    transition: 0.3s;
}

.sidebar ul li:hover::before {
    transform: scaleY(1);
}

/* =========================
   MAIN CONTENT
========================= */
.main-content {
    margin-left: 260px;
    flex: 1;
    padding: 30px;
}

/* HEADER */
header {
    margin-bottom: 25px;
}

header h1 {
    font-size: 32px;
    color: #0f172a;
    font-weight: 700;
}

/* =========================
   UPLOAD SECTION
========================= */
.upload-section {
    background: white;
    padding: 20px;
    border-radius: 16px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.08);
    margin-bottom: 25px;
}

.upload-section form {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-wrap: wrap;
}

.upload-section input[type="file"] {
    padding: 10px;
    border: 1px solid #ddd;
    border-radius: 10px;
    background: #f9fafb;
}

.upload-section button {
    padding: 12px 20px;
    background: linear-gradient(135deg, #007bff, #00c6ff);
    color: white;
    border: none;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    transition: 0.25s ease;
}

.upload-section button:hover {
    transform: scale(1.05);
}

/* =========================
   KPI CARDS
========================= */
.kpi-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 18px;
    margin-bottom: 30px;
}

.card {
    background: white;
    padding: 22px;
    border-radius: 16px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.08);
    text-align: center;
    font-size: 16px;
    font-weight: 600;
    transition: 0.25s ease;
}

.card:hover {
    transform: translateY(-5px);
}

/* =========================
   CHART SECTION
========================= */
.chart-section {
    background: white;
    padding: 25px;
    border-radius: 16px;
    box-shadow: 0 6px 18px rgba(0,0,0,0.08);
    min-height: 420px;
}

/* =========================
   CHATBOT TOGGLE BUTTON (BOTTOM RIGHT)
========================= */
#chatbot-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 62px;
    height: 62px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, #007bff, #00c6ff);
    color: white;
    font-size: 26px;
    cursor: pointer;
    box-shadow: 0 6px 18px rgba(0,0,0,0.3);
    z-index: 9999;
    transition: all 0.25s ease;
}

#chatbot-toggle:hover {
    transform: scale(1.1);
}

/* =========================
   CHATBOT WINDOW (BOTTOM RIGHT)
========================= */
#chatbot-widget {
    position: fixed;
    bottom: 95px;
    right: 20px;
    width: 360px;
    height: 520px;
    background: white;
    display: none;
    flex-direction: column;
    border-radius: 18px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.25);
    overflow: hidden;
    z-index: 9999;
    transition: all 0.25s ease;
}

/* CHAT HEADER */
#chat-header {
    background: linear-gradient(135deg, #007bff, #00c6ff);
    color: white;
    padding: 14px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
}

#chat-header button {
    background: transparent;
    border: none;
    color: white;
    font-size: 20px;
    cursor: pointer;
}

/* CHAT MESSAGES */
#chat-messages {
    flex: 1;
    padding: 12px;
    overflow-y: auto;
    background: #f4f7fa;
    display: flex;
    flex-direction: column;
    gap: 10px;
    scroll-behavior: smooth;
}

/* USER MESSAGE */
.user-message {
    align-self: flex-end;
    background: #007bff;
    color: white;
    padding: 10px 12px;
    border-radius: 14px 14px 0 14px;
    max-width: 80%;
    font-size: 14px;
    word-break: break-word;
}

/* BOT MESSAGE */
.bot-message {
    align-self: flex-start;
    background: white;
    color: #333;
    padding: 10px 12px;
    border-radius: 14px 14px 14px 0;
    max-width: 80%;
    font-size: 14px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* CHAT INPUT AREA */
#chat-input-area {
    display: flex;
    padding: 10px;
    border-top: 1px solid #ddd;
    background: white;
    position: sticky;
    bottom: 0;
}

#chat-input {
    flex: 1;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 10px;
    outline: none;
}

#chat-input:focus {
    border-color: #007bff;
}

#chat-input-area button {
    margin-left: 8px;
    padding: 10px 14px;
    border: none;
    background: #007bff;
    color: white;
    border-radius: 10px;
    cursor: pointer;
    transition: 0.2s;
}

#chat-input-area button:hover {
    background: #0056b3;
}

/* =========================
   RESPONSIVE DESIGN
========================= */
@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }

    .main-content {
        margin-left: 200px;
        padding: 20px;
    }

    #chatbot-widget {
        width: 90%;
        right: 5%;
        height: 70%;
    }
}

/* =========================
   SMOOTH BUTTON ANIMATION
========================= */
button {
    transition: all 0.2s ease;
}

button:active {
    transform: scale(0.95);
}