/* Global reset */
body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    background: #0f172a;
    color: #e5e7eb;
}

/* Navigation */
nav {
    padding: 1rem 2rem;
    display: flex;
    gap: 1.5rem;
    border-bottom: 1px solid #1e293b;
}

    nav a {
        color: #e5e7eb;
        text-decoration: none;
        opacity: 0.8;
    }

        nav a:hover {
            opacity: 1;
        }

/* Centered page layout */
.page {
    min-height: calc(100vh - 64px);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.page-content {
    width: min(1200px, 92vw);
    padding: 2rem;
}

/* Typography */
h1 {
    font-size: 3rem;
    margin-bottom: 0.75rem;
}

p {
    font-size: 1.1rem;
    opacity: 0.85;
}

small {
    opacity: 0.6;
}
/* Prompt input (core entry UI) */
.prompt-box {
    width: 100%;
    max-width: 1100px;
    display: flex;
    gap: 0.75rem;
    margin: 2rem auto 0;
    align-items: center;
}

textarea {
    flex: 1 1 auto;
    width: 100%;
    height: 64px;
    min-height: 64px;
    max-height: 120px;
    overflow: hideen;
    resize: none;

    padding: 1.1rem 1.25rem;
    font-size: 1.05rem;
    line-height: 1.35;

    border-radius: 14px;
    border: 1px solid #1e293b;
    background: #020617;
    color: #e5e7eb;
    outline: none;
}

textarea::placeholder {
    color: #64748b;
}

button {
    height: 64px;
    padding: 0 1.5rem;
    border-radius: 14px;
    border: none;
    background: #2563eb;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    min-width: 130px;
}

button:hover {
    background: #1d4ed8;
}