@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
    --bg: #0b0b14;
    --card: #151522;
    --purple: #a78bfa;
    --pink: #f0abfc;
    --text: #f5f3ff;
    --muted: #a5a3b8;
    --border: #2b2940;
}

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

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    background-image:
        radial-gradient(ellipse at 50% 0%, #38205a55, transparent 55%);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 8%;
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 23px;
    font-weight: 800;
    color: var(--text);
    text-decoration: none;
}

.logo span,
.hero h1 span {
    color: var(--purple);
}

.tagline {
    color: var(--muted);
    font-size: 13px;
}

.container {
    width: min(760px, 90%);
    margin: 0 auto;
}

.hero {
    text-align: center;
    padding: 76px 0 38px;
}

.eyebrow {
    color: var(--pink);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 3px;
}

.hero h1 {
    font-size: clamp(42px, 7vw, 66px);
    line-height: 1.12;
    margin: 20px 0;
    letter-spacing: -2px;
}

.hero p {
    color: var(--muted);
    line-height: 1.8;
    font-size: 15px;
    max-width: 500px;
    margin: 0 auto;
}

.study-card,
.result-card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 28px;
    box-shadow: 0 20px 70px #00000025;
}

.study-card label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin: 0 0 12px;
}

textarea,
select {
    width: 100%;
    background: #0e0e19;
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 15px;
    color: var(--text);
    font: inherit;
    margin-bottom: 24px;
    outline: none;
}

textarea {
    min-height: 180px;
    resize: vertical;
    line-height: 1.7;
}

textarea:focus,
select:focus {
    border-color: var(--purple);
}

textarea::placeholder {
    color: #77758c;
}

select {
    cursor: pointer;
}

button {
    width: 100%;
    padding: 16px;
    border: none;
    border-radius: 12px;
    background: linear-gradient(100deg, #8b5cf6, #c084fc);
    color: white;
    font: inherit;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, opacity 0.2s;
}

button:hover {
    transform: translateY(-2px);
    opacity: 0.92;
}

button:disabled {
    opacity: 0.6;
    cursor: wait;
    transform: none;
}

.hint {
    color: var(--muted);
    font-size: 12px;
    text-align: center;
    margin-top: 16px;
    line-height: 1.6;
}

.result-card {
    margin-top: 24px;
    line-height: 1.8;
    overflow-wrap: anywhere;
}

.result-card h2 {
    color: var(--purple);
    margin-bottom: 16px;
    font-size: 21px;
}

.result-card[hidden] {
    display: none;
}

#result {
    white-space: pre-wrap;
    color: #e4e1f0;
    font-size: 14px;
}

footer {
    text-align: center;
    color: var(--muted);
    font-size: 12px;
    padding: 38px 0;
}

@media (max-width: 520px) {
    .navbar {
        padding: 20px 5%;
        gap: 12px;
    }

    .logo {
        font-size: 19px;
    }

    .tagline {
        font-size: 11px;
    }

    .hero {
        padding-top: 55px;
    }

    .study-card,
    .result-card {
        padding: 20px;
    }
}