* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: "Segoe UI", system-ui, -apple-system, sans-serif;
}

body {
    background:
        radial-gradient(circle at 20% 20%, rgba(30, 58, 138, 0.33), transparent 40%),
        radial-gradient(circle at 80% 30%, rgba(147, 51, 234, 0.33), transparent 40%),
        radial-gradient(circle at 50% 80%, rgba(14, 165, 233, 0.33), transparent 40%),
        linear-gradient(180deg, #020617, #000);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #e5e7eb;
    padding: 16px;
}

.chat-container {
    width: 420px;
    height: 620px;
    background: rgba(2, 6, 23, 0.9);
    backdrop-filter: blur(12px);
    border-radius: 18px;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow:
        0 0 0 1px rgba(148, 163, 184, 0.08),
        0 20px 40px rgba(0, 0, 0, 0.8),
        0 0 40px rgba(56, 189, 248, 0.15);
    animation: fadeIn 0.5s ease;
}

.chat-header {
    padding: 18px;
    text-align: center;
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 6px;
    color: #e0f2fe;
    background:
        linear-gradient(135deg, #020617, rgba(2, 6, 23, 0.8)),
        linear-gradient(135deg, #38bdf8, #9333ea);
    background-blend-mode: overlay;
    border-bottom: 1px solid #1e293b;
    text-shadow: 0 0 8px #38bdf8, 0 0 16px #9333ea;
}

#chat-box {
    flex: 1;
    padding: 14px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #334155 transparent;
}

#chat-box::-webkit-scrollbar {
    width: 6px;
}

#chat-box::-webkit-scrollbar-thumb {
    background: #334155;
    border-radius: 10px;
}

.message {
    max-width: 78%;
    padding: 12px 15px;
    margin: 10px 0;
    border-radius: 14px;
    font-size: 14.5px;
    line-height: 1.45;
    animation: slideUp 0.25s ease;
    word-wrap: break-word;
}

.user {
    align-self: flex-end;
    background: linear-gradient(135deg, #2563eb, #1d4ed8);
    color: #fff;
    border-bottom-right-radius: 4px;
}

.bot {
    align-self: flex-start;
    background: #1e293b;
    color: #e5e7eb;
    border-bottom-left-radius: 4px;
}

.message img {
    max-width: 100%;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.4s ease;
}

.chat-input {
    display: flex;
    align-items: center;
    padding: 10px;
    gap: 8px;
    background: linear-gradient(180deg, rgba(2, 6, 23, 0.8), #020617);
    border-top: 1px solid #1e293b;
}

.chat-input input {
    flex: 1;
    padding: 12px 14px;
    border-radius: 10px;
    border: none;
    outline: none;
    background: #020617;
    color: #f8fafc;
    font-size: 14px;
    box-shadow: inset 0 0 0 1px #1e293b;
}

.chat-input input::placeholder {
    color: #64748b;
}

.chat-input button {
    height: 42px;
    padding: 0 16px;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s ease;
}

.chat-input button:first-of-type {
    background: linear-gradient(135deg, #38bdf8, #0ea5e9);
    color: #020617;
}

.chat-input button:first-of-type:hover,
.chat-input button:last-of-type:hover {
    transform: translateY(-1px);
}

.chat-input button:first-of-type:hover {
    box-shadow: 0 6px 16px rgba(56, 189, 248, 0.4);
}

.chat-input button:last-of-type {
    background: linear-gradient(135deg, #22c55e, #16a34a);
    color: #020617;
}

.chat-input button:last-of-type:hover {
    box-shadow: 0 6px 16px rgba(34, 197, 94, 0.4);
}

.loader {
    width: 26px;
    height: 26px;
    border: 3px solid #334155;
    border-top: 3px solid #38bdf8;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        transform: translateY(6px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

@media (max-width: 480px) {
    .chat-container {
        width: 100%;
        height: calc(100vh - 32px);
        border-radius: 16px;
    }
}