/* ==== RESET & BASE ==== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}
html { font-size: 100%; }
body {
    font-family: 'Inter', sans-serif;
    background: #000;
    color: #fff;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(255,255,255,.03) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(255,255,255,.03) 0%, transparent 20%);
}

/* ==== CONTAINER ==== */
/* ==== CONTAINER ==== */
.container {
    width: 100%;
    max-width: 780px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.06);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 1.5rem;
    box-shadow: 0 8px 32px rgba(0,0,0,.4);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* ==== HEADER ==== */
.header {
    text-align: center;
    padding: 1.8rem 1.2rem 1rem;
    border-bottom: 1px solid rgba(255,255,255,.08);
}
.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: .5rem;
}
.header .subtitle {
    margin-top: .4rem;
    font-size: .95rem;
    opacity: .75;
}

/* ==== UPLOAD SECTION ==== */
.upload-section {
    padding: 1.5rem 1.2rem;
    display: flex;
    flex-direction: column;
    gap: .75rem;
    align-items: center;
}
.file-label {
    cursor: pointer;
    background: rgba(255,255,255,.08);
    border: 1px dashed rgba(255,255,255,.2);
    border-radius: .75rem;
    padding: .75rem 1.2rem;
    font-size: .95rem;
    transition: all .2s ease;
    display: flex;
    align-items: center;
    gap: .5rem;
}
.file-label:hover { background: rgba(255,255,255,.12); }
#uploadBtn {
    margin-top: .5rem;
}
.status {
    min-height: 1.4rem;
    font-size: .85rem;
    text-align: center;
}

/* ==== BUTTONS ==== */
.btn {
    cursor: pointer;
    font-weight: 600;
    border: none;
    border-radius: .6rem;
    padding: .55rem 1rem;
    font-size: .95rem;
    transition: all .2s ease;
    display: inline-flex;
    align-items: center;
    gap: .4rem;
}
.btn-primary {
    background: #fff;
    color: #000;
}
.btn-primary:hover { background: #f0f0f0; transform: translateY(-1px); }
.btn-send {
    background: transparent;
    color: #fff;
    font-size: 1.1rem;
}
.btn-send:hover { color: #ccc; }

/* ==== CHAT SECTION ==== */
.chat-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 0 1.2rem 1.2rem;
}
.chat-box {
    flex: 1;
    overflow-y: auto;
    padding: .5rem 0;
    display: flex;
    flex-direction: column;
    gap: .75rem;
    max-height: 55vh;
}
.chat-box::-webkit-scrollbar { width: 6px; }
.chat-box::-webkit-scrollbar-thumb {
    background: rgba(255,255,255,.2);
    border-radius: 3px;
}

/* ==== MESSAGES ==== */
.message {
    max-width: 86%;
    padding: .85rem 1.1rem;
    border-radius: 1.1rem;
    line-height: 1.5;
    font-size: .95rem;
    word-wrap: break-word;
    animation: fadeIn .25s ease-out;
}
.message.user {
    align-self: flex-end;
    background: #fff;
    color: #000;
    border-bottom-right-radius: .35rem;
}
.message.bot {
    align-self: flex-start;
    background: rgba(255,255,255,.09);
    color: #eee;
    border-bottom-left-radius: .35rem;
}

/* ==== MARKDOWN STYLES (inside bot) ==== */
.message.bot h1,
.message.bot h2,
.message.bot h3 {
    color: #fff;
    margin: .6rem 0 .4rem;
    font-weight: 600;
}
.message.bot h1 { font-size: 1.35rem; }
.message.bot h2 { font-size: 1.2rem; }
.message.bot h3 { font-size: 1.05rem; }

.message.bot pre {
    background: #111;
    color: #f1f1f1;
    padding: .85rem;
    border-radius: .6rem;
    margin: .6rem 0;
    overflow-x: auto;
    font-size: .85rem;
}
.message.bot code {
    background: rgba(255,255,255,.12);
    color: #fff;
    padding: .15rem .4rem;
    border-radius: .35rem;
    font-family: 'Fira Mono', Consolas, monospace;
}
.message.bot table {
    width: 100%;
    border-collapse: collapse;
    margin: .8rem 0;
    font-size: .88rem;
}
.message.bot th,
.message.bot td {
    border: 1px solid rgba(255,255,255,.15);
    padding: .55rem .75rem;
    text-align: left;
}
.message.bot th {
    background: rgba(255,255,255,.1);
    font-weight: 600;
}
.message.bot tr:nth-child(even) td { background: rgba(255,255,255,.03); }

/* ==== INPUT AREA ==== */
.input-area {
    display: flex;
    gap: .5rem;
    margin-top: .75rem;
    padding-top: .75rem;
    border-top: 1px solid rgba(255,255,255,.08);
}
#userInput {
    flex: 1;
    background: rgba(255,255,255,.08);
    border: none;
    border-radius: .75rem;
    padding: .75rem 1rem;
    color: #fff;
    font-size: .95rem;
    outline: none;
    transition: background .2s;
}
#userInput::placeholder { color: rgba(255,255,255,.5); }
#userInput:focus { background: rgba(255,255,255,.14); }

/* ==== ANIMATIONS ==== */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(8px); }
    to   { opacity: 1; transform: none; }
}

/* ==== RESPONSIVE ==== */
@media (max-width: 480px) {
    .container { border-radius: 1rem; }
    .header h1 { font-size: 1.5rem; }
    .message { font-size: .9rem; }
}