:root {
    --bg: #32168f;
    --bg-deep: #24105f;
    --surface: rgba(255, 255, 255, 0.08);
    --text: #f7f5ff;
    --muted: #d7d0f0;
    --accent: #8fd3ff;
    --border: rgba(255, 255, 255, 0.16);
}

* {
    box-sizing: border-box;
}

html {
    min-height: 100%;
    background: linear-gradient(135deg, var(--bg-deep), var(--bg));
}

body {
    margin: 0;
    min-height: 100vh;
    padding: 48px 24px;
    font-family: Arial, Helvetica, sans-serif;
    color: var(--text);
    background: transparent;
    line-height: 1.6;
}

body > * {
    width: min(760px, 100%);
    margin-left: auto;
    margin-right: auto;
}

h1 {
    margin: 0 0 32px;
    font-size: clamp(2.25rem, 6vw, 4rem);
    line-height: 1.05;
    letter-spacing: -0.04em;
}

h2 {
    margin-top: 32px;
    margin-bottom: 8px;
    color: var(--accent);
    font-size: 1.35rem;
}

p {
    margin-top: 0;
    color: var(--muted);
    font-size: 1.05rem;
}

footer {
    margin-top: 48px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

@media (max-width: 600px) {
    body {
        padding: 32px 18px;
    }
}

.chat-section {
    margin-top: 48px;
}

.chat-window {
    min-height: 320px;
    max-height: 480px;
    overflow-y: auto;
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: 16px;
    background: var(--surface);
    backdrop-filter: blur(10px);
}

.message {
    width: fit-content;
    max-width: 80%;
    margin-bottom: 14px;
    padding: 12px 16px;
    border-radius: 14px;
}

.assistant-message {
    margin-right: auto;
    background: rgba(255, 255, 255, 0.12);
    color: var(--text);
}

.user-message {
    margin-left: auto;
    background: var(--accent);
    color: #111;
}

.chat-form {
    display: flex;
    gap: 10px;
    margin-top: 14px;
}

.chat-form input {
    flex: 1;
    padding: 14px 16px;
    border: 1px solid var(--border);
    border-radius: 12px;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.08);
    color: var(--text);
    outline: none;
}

.chat-form input::placeholder {
    color: var(--muted);
}

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

.chat-form button {
    padding: 14px 20px;
    border: none;
    border-radius: 12px;
    font-size: 1rem;
    cursor: pointer;
    background: var(--accent);
    color: #111;
}

.chat-form button:hover {
    opacity: 0.9;
}

.chat-form button:disabled {
    opacity: 0.6;
    cursor: wait;
}