:root {
    --user-color: #007bff;
    --bot-color: #333;
    --bg: #f5f6fa;
    --card-bg: #fff;
}

body {
    font-family: "Inter", sans-serif;
    background: var(--bg);
    padding: 2rem;
    display: flex;
    justify-content: center;
}

#wrap {
    width: 980px;
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: 16px;
}

#chat {
    background: var(--card-bg);
    padding: 1.2rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, .08);
    display: flex;
    flex-direction: column;
    height: 80vh;
}

h2 {
    margin: 0 0 10px;
    color: #333
}

    #messages {
      position: relative;
      overflow-y: auto;
      height: 70vh;
      display: flex;
      flex-direction: column;
    }

    #typing {
      position: sticky;
      bottom: 0;
      background: #fafafa;
      padding: 6px 10px;
      font-style: italic;
      color: gray;
      border-top: 1px solid #eee;
      display: none;
      text-align: left;
      width: 20%;
    }

.msg {
    margin: .75rem 0;
    padding: .6rem .9rem;
    border-radius: 10px;
    width: fit-content;
    max-width: 95%;
    word-wrap: break-word;
    animation: fadeIn .3s ease-in-out;
}

.user {
    background: var(--user-color);
    color: #fff;
    margin-left: auto;
    text-align: right;
    border-bottom-right-radius: 0;
}

.bot {
    background: #e9ecef;
    color: var(--bot-color);
    margin-right: auto;
    border-bottom-left-radius: 0;
}

.bot pre {
    background: #272822;
    color: #f8f8f2;
    padding: .5rem;
    border-radius: 5px;
    overflow-x: auto;
}

.bot code {
    background: #f4f4f4;
    padding: 2px 4px;
    border-radius: 3px;
}

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

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

#input-box {
    display: flex;
    margin-top: 1rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
}

#input {
    flex: 1;
    border: none;
    padding: .8rem;
    font-size: 1rem;
    outline: none;
}

button {
    background: var(--user-color);
    color: white;
    border: none;
    padding: 0 1.2rem;
    cursor: pointer;
    font-weight: bold;
    transition: .2s;
}

button:hover {
    background: #0062cc
}

button:disabled {
    opacity: .6;
    cursor: not-allowed
}

.typing {
    font-style: italic;
    color: gray;
    margin-top: .5rem
}

/* Side panel (upload) */
#side {
    background: var(--card-bg);
    padding: 1.2rem;
    border-radius: 12px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, .08);
    height: 80vh;
    display: flex;
    flex-direction: column;
}

.drop {
    flex: 0 0 auto;
    border: 2px dashed #cfd4da;
    border-radius: 10px;
    padding: 14px;
    text-align: center;
    color: #555;
    margin-bottom: 12px
}

.drop.drag {
    background: #f0f6ff;
    border-color: #7aa7ff
}

small {
    color: #666
}

#uploadLog {
    flex: 1;
    overflow: auto;
    background: #fafafa;
    border-radius: 8px;
    padding: 8px;
}

#uploadBtn {
    padding: 4px;
    border-radius: 5px;
}

.intro {
    background: #f8f9fa;
    border: 1px solid #dee2e6;
    border-radius: 8px;
    padding: 1rem;
    margin: 1rem 0;
    color: #333;
}

.intro h3 {
    margin-top: 0;
    color: #212529;
}

.intro code {
    background: #eee;
    padding: 2px 5px;
    border-radius: 4px;
}