:root {
    --bg-color: #0b0f19;
    --card-bg: rgba(20, 27, 44, 0.7);
    --border-color: rgba(255, 255, 255, 0.1);
    --accent-cyan: #38bdf8;
    --accent-purple: #c084fc;
    --text-color: #f8fafc;
    --font-sans: 'Outfit', sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-sans);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    padding: 1.5rem 1rem;
}

.container {
    width: 100%;
    max-width: 750px;
    display: flex;
    flex-direction: column;
    height: 88vh;
}

header {
    text-align: center;
    margin-bottom: 1rem;
}

.bot-avatar-box {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    margin: 0 auto 0.75rem;
    border: 2px solid var(--accent-cyan);
    box-shadow: 0 0 25px rgba(56, 189, 248, 0.3);
    overflow: hidden;
    position: relative;
}

.bot-avatar-box img {
    width: 100%; height: 100%; object-fit: cover;
}

h1 { font-size: 1.75rem; font-weight: 800; }
p.subtitle { color: #94a3b8; font-size: 0.9rem; }

/* Chat Area */
.chat-box {
    flex-grow: 1;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 1.25rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    backdrop-filter: blur(12px);
    margin-bottom: 1rem;
}

.msg {
    max-width: 80%;
    padding: 0.85rem 1.1rem;
    border-radius: 14px;
    font-size: 0.95rem;
    line-height: 1.5;
}

.msg.bot {
    align-self: flex-start;
    background: rgba(56, 189, 248, 0.12);
    border: 1px solid rgba(56, 189, 248, 0.3);
    color: #ffffff;
    border-bottom-left-radius: 4px;
}

.msg.user {
    align-self: flex-end;
    background: linear-gradient(135deg, var(--accent-cyan) 0%, #0284c7 100%);
    color: #0b0f19;
    font-weight: 600;
    border-bottom-right-radius: 4px;
}

/* Quick Prompts */
.prompts-bar {
    display: flex;
    gap: 0.5rem;
    overflow-x: auto;
    padding-bottom: 0.5rem;
    margin-bottom: 0.75rem;
}

.prompt-chip {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    color: #cbd5e1;
    padding: 0.4rem 0.8rem;
    border-radius: 16px;
    font-size: 0.8rem;
    white-space: nowrap;
    cursor: pointer;
    transition: all 0.2s ease;
}

.prompt-chip:hover {
    background: rgba(56, 189, 248, 0.15);
    border-color: var(--accent-cyan);
    color: var(--accent-cyan);
}

/* Input Form */
.input-form {
    display: flex;
    gap: 0.75rem;
}

.input-form input {
    flex-grow: 1;
    background: rgba(20, 27, 44, 0.8);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 0.85rem 1.2rem;
    color: #ffffff;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    outline: none;
}

.input-form input:focus {
    border-color: var(--accent-cyan);
}

.btn-send {
    background: var(--accent-cyan);
    color: #0b0f19;
    border: none;
    padding: 0 1.5rem;
    border-radius: 12px;
    font-weight: 700;
    cursor: pointer;
}

footer { font-size: 0.85rem; color: #94a3b8; text-align: center; margin-top: 0.5rem; }
footer a { color: var(--accent-cyan); text-decoration: none; }

@media (max-width: 640px) {
    body { padding: 1rem 0.75rem; }
    .container { height: 92vh; }
    h1 { font-size: 1.4rem; }
    .subtitle { font-size: 0.82rem; }
}