:root {
    --ink: #0F172A;
    --muted: #64748B;
    --line: #E2E8F0;
    --bg: #F6F7F9;
    --surface: #FFFFFF;
    --green: #16A34A;
    --green-dark: #15803D;
    --green-soft: #ECFDF3;
    --red: #DC2626;
    --radius: 14px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    color: var(--ink);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a { color: var(--green-dark); }

/* ---- Sticky progress ---- */
.progress-bar {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: 4px;
    background: var(--line);
    z-index: 50;
}
.progress-bar span {
    display: block;
    height: 100%;
    width: 0%;
    background: var(--green);
    transition: width .25s ease;
}

/* ---- Hero ---- */
.hero {
    background: var(--ink);
    color: #fff;
    padding: 72px 24px 56px;
}
.hero-inner { max-width: 760px; margin: 0 auto; }
.eyebrow {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    letter-spacing: .04em;
    color: #4ADE80;
    margin-bottom: 18px;
}
.hero h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: clamp(30px, 5vw, 46px);
    line-height: 1.08;
    font-weight: 700;
    margin: 0 0 18px;
    letter-spacing: -0.02em;
}
.lede {
    font-size: 17px;
    color: #CBD5E1;
    max-width: 620px;
    margin: 0 0 26px;
}
.meta-row { display: flex; flex-wrap: wrap; gap: 10px; }
.chip {
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    color: #E2E8F0;
    border: 1px solid #334155;
    border-radius: 999px;
    padding: 6px 13px;
}
#progressChip { border-color: var(--green); color: #6EE7A0; }

/* ---- Form ---- */
.form-wrap {
    max-width: 760px;
    margin: -28px auto 0;
    padding: 0 24px 80px;
}

.error-box {
    background: #FEF2F2;
    border: 1px solid #FCA5A5;
    color: #991B1B;
    border-radius: var(--radius);
    padding: 16px 20px;
    margin-bottom: 24px;
    font-size: 14px;
}
.error-box ul { margin: 8px 0 0; padding-left: 20px; }

.block {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: var(--radius);
    padding: 30px 30px 12px;
    margin-bottom: 22px;
    box-shadow: 0 1px 2px rgba(15,23,42,.04);
}

.block-head {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    margin-bottom: 26px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--line);
}
.block-tag {
    font-family: 'JetBrains Mono', monospace;
    font-weight: 600;
    font-size: 14px;
    color: var(--green-dark);
    background: var(--green-soft);
    border-radius: 8px;
    padding: 7px 11px;
    line-height: 1;
    flex: 0 0 auto;
}
.block-head h2 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 22px;
    font-weight: 600;
    margin: 2px 0 4px;
    letter-spacing: -0.01em;
}
.block-intro { margin: 0; color: var(--muted); font-size: 14px; }

/* ---- Fields ---- */
.field { margin-bottom: 24px; }
.field label {
    display: block;
    margin-bottom: 10px;
    font-size: 15px;
    font-weight: 500;
}
.qnum {
    display: inline-block;
    font-family: 'JetBrains Mono', monospace;
    font-size: 12px;
    font-weight: 600;
    color: #fff;
    background: var(--ink);
    border-radius: 6px;
    padding: 2px 8px;
    margin-right: 8px;
    vertical-align: 1px;
}
.qtext { color: var(--ink); }
.req { color: var(--red); }

textarea, input[type="text"], input[type="email"] {
    width: 100%;
    font-family: inherit;
    font-size: 15px;
    color: var(--ink);
    background: #FCFCFD;
    border: 1px solid var(--line);
    border-radius: 10px;
    padding: 13px 14px;
    transition: border-color .15s, box-shadow .15s, background .15s;
    resize: vertical;
}
textarea { min-height: 96px; line-height: 1.55; }
textarea:focus, input:focus {
    outline: none;
    border-color: var(--green);
    background: #fff;
    box-shadow: 0 0 0 3px rgba(22,163,74,.12);
}

/* ---- Submit ---- */
.submit-row { text-align: center; padding: 14px 0 0; }
.btn-submit {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 16px;
    font-weight: 600;
    color: #fff;
    background: var(--green);
    border: none;
    border-radius: 11px;
    padding: 15px 38px;
    cursor: pointer;
    transition: background .15s, transform .05s;
    box-shadow: 0 4px 14px rgba(22,163,74,.28);
}
.btn-submit:hover { background: var(--green-dark); }
.btn-submit:active { transform: translateY(1px); }
.submit-row .muted { margin-top: 14px; font-size: 12.5px; }

.muted { color: var(--muted); }

/* ---- Footer ---- */
.site-foot {
    max-width: 760px;
    margin: 0 auto;
    padding: 26px 24px 50px;
    display: flex;
    justify-content: space-between;
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    color: var(--muted);
}

/* ---- Thank you ---- */
.done-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}
.done-card {
    background: var(--surface);
    border: 1px solid var(--line);
    border-radius: 20px;
    padding: 48px 40px;
    max-width: 520px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(15,23,42,.08);
}
.done-mark {
    font-family: 'JetBrains Mono', monospace;
    font-size: 13px;
    font-weight: 600;
    color: var(--green-dark);
    background: var(--green-soft);
    display: inline-block;
    padding: 8px 16px;
    border-radius: 999px;
    margin-bottom: 22px;
}
.done-card h1 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 26px;
    margin: 0 0 14px;
}
.done-card p { color: var(--muted); margin: 0 0 12px; }

@media (max-width: 560px) {
    .hero { padding: 56px 20px 48px; }
    .block { padding: 24px 20px 8px; }
    .site-foot { flex-direction: column; gap: 6px; }
}

/* ---- Type-only note + paste warning ---- */
.type-note {
    background: #FFFBEB;
    border: 1px solid #FDE68A;
    color: #92400E;
    border-radius: 12px;
    padding: 13px 18px;
    margin-bottom: 22px;
    font-size: 14px;
    font-weight: 500;
}
.field { position: relative; }
.paste-warn {
    position: absolute;
    right: 0;
    bottom: 100%;
    margin-bottom: 6px;
    background: #DC2626;
    color: #fff;
    font-size: 12.5px;
    font-weight: 500;
    padding: 6px 11px;
    border-radius: 8px;
    opacity: 0;
    transform: translateY(4px);
    pointer-events: none;
    transition: opacity .15s, transform .15s;
    box-shadow: 0 4px 12px rgba(220,38,38,.3);
    z-index: 5;
}
.paste-warn.show { opacity: 1; transform: translateY(0); }

/* ---- Multiple choice ---- */
.mcq-q { font-size: 15px; font-weight: 500; margin: 0 0 14px; line-height: 1.5; }
.opts { display: flex; flex-direction: column; gap: 10px; }
.opt {
    display: flex; align-items: flex-start; gap: 12px;
    border: 1px solid var(--line); border-radius: 11px;
    padding: 13px 15px; cursor: pointer;
    transition: border-color .12s, background .12s, box-shadow .12s;
    background: #FCFCFD;
}
.opt:hover { border-color: #CBD5E1; background: #fff; }
.opt input { position: absolute; opacity: 0; width: 0; height: 0; }
.opt-mark {
    flex: 0 0 auto; display: inline-block; width: 19px; height: 19px; margin-top: 1px;
    border: 2px solid #CBD5E1; border-radius: 50%;
    transition: border-color .12s; position: relative;
}
.opt-mark::after {
    content: ''; position: absolute; inset: 3px;
    border-radius: 50%; background: var(--green); transform: scale(0);
    transition: transform .12s;
}
.opt-text { font-size: 14.5px; line-height: 1.45; color: var(--ink); }
.opt:has(input:checked) { border-color: var(--green); background: var(--green-soft); box-shadow: 0 0 0 3px rgba(22,163,74,.1); }
.opt:has(input:checked) .opt-mark { border-color: var(--green); }
.opt:has(input:checked) .opt-mark::after { transform: scale(1); }
.opt input:focus-visible + .opt-mark { box-shadow: 0 0 0 3px rgba(22,163,74,.25); }