:root {
  color-scheme: light;
  --ink: #152234;
  --muted: #667085;
  --navy: #132a46;
  --navy-soft: #23476f;
  --violet: #6756ad;
  --line: #d9dee7;
  --paper: #ffffff;
  --wash: #f4f6f9;
  --danger: #c53d4a;
  --success: #18794e;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  background:
    radial-gradient(circle at 20% 0%, rgba(103, 86, 173, 0.09), transparent 24rem),
    var(--wash);
  font-family: Pretendard, "Apple SD Gothic Neo", "Noto Sans KR", sans-serif;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

main { width: min(100%, 920px); margin: 0 auto; padding: 34px 22px 70px; }

.hero {
  position: relative;
  overflow: hidden;
  min-height: 430px;
  padding: 66px clamp(24px, 7vw, 74px) 42px;
  color: white;
  border-radius: 30px;
  background:
    linear-gradient(118deg, rgba(12, 25, 43, 0.98), rgba(19, 42, 70, 0.89)),
    linear-gradient(35deg, #4b416f, #132a46);
  box-shadow: 0 24px 70px rgba(19, 42, 70, 0.2);
}

.hero::before, .hero::after {
  content: "";
  position: absolute;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 50%;
}

.hero::before { width: 420px; height: 420px; right: -120px; top: -190px; }
.hero::after { width: 270px; height: 270px; right: -40px; top: -105px; }

.hero__eyebrow { color: #c8c0ff; font-size: 13px; font-weight: 750; letter-spacing: .16em; }
.hero h1 { margin: 15px 0 16px; font-size: clamp(38px, 7vw, 64px); line-height: 1.12; letter-spacing: -.05em; }
.hero__description { margin: 0; max-width: 590px; color: rgba(255,255,255,.76); font-size: clamp(16px, 2.3vw, 19px); }

.hero__steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 55px; }
.hero__steps span { position: relative; padding: 17px 16px; border: 1px solid rgba(255,255,255,.2); border-radius: 13px; background: rgba(255,255,255,.06); backdrop-filter: blur(6px); font-weight: 650; }
.hero__steps b { margin-right: 8px; color: #aea3f2; font-size: 12px; }
.hero__steps small { display: block; margin: 3px 0 0 29px; color: rgba(255,255,255,.5); font-weight: 500; }

.form-card { margin-top: 24px; padding: clamp(26px, 6vw, 58px); border: 1px solid rgba(19,42,70,.08); border-radius: 30px; background: var(--paper); box-shadow: 0 18px 55px rgba(19,42,70,.09); }
.form-heading { padding-bottom: 36px; border-bottom: 1px solid var(--line); }
.form-heading p { margin: 0 0 6px; color: var(--violet); font-size: 12px; font-weight: 800; letter-spacing: .14em; }
.form-heading h2 { margin: 0; font-size: clamp(25px, 4vw, 35px); letter-spacing: -.04em; }
.form-heading > span { display: block; margin-top: 8px; color: var(--muted); font-size: 13px; }
i { color: var(--danger); font-style: normal; }

.section-block { margin: 0; padding: 38px 0; border: 0; border-bottom: 1px solid var(--line); }
.section-block legend { float: left; width: 100%; margin-bottom: 5px; padding: 0; font-size: 21px; font-weight: 780; letter-spacing: -.025em; }
.section-block legend + * { clear: both; }
.section-block legend span { display: inline-grid; place-items: center; width: 34px; height: 34px; margin-right: 8px; color: white; border-radius: 50%; background: var(--navy); font-size: 12px; letter-spacing: 0; }
.field-help { margin: 0 0 18px 46px; color: var(--muted); font-size: 14px; }

.lecture-grid { display: grid; gap: 12px; }
.lecture-option { display: block; cursor: pointer; }
.lecture-option input { position: absolute; opacity: 0; pointer-events: none; }
.lecture-option__body { display: grid; grid-template-columns: 84px 1fr 26px; align-items: center; gap: 18px; min-height: 88px; padding: 17px 20px; border: 1.5px solid var(--line); border-radius: 16px; transition: border-color .18s, box-shadow .18s, transform .18s, background .18s; }
.lecture-option__date { display: flex; flex-direction: column; align-items: center; padding-right: 17px; border-right: 1px solid var(--line); color: var(--navy); font-size: 19px; font-weight: 800; }
.lecture-option__date small { color: var(--muted); font-size: 12px; font-weight: 650; }
.lecture-option__topic { font-weight: 700; letter-spacing: -.015em; }
.lecture-option__check { display: grid; place-items: center; width: 24px; height: 24px; border: 1.5px solid #aeb7c5; border-radius: 50%; }
.lecture-option input:checked + .lecture-option__body { border-color: var(--violet); background: #f8f6ff; box-shadow: 0 0 0 3px rgba(103,86,173,.1); }
.lecture-option input:checked + .lecture-option__body .lecture-option__check { border-color: var(--violet); background: var(--violet); box-shadow: inset 0 0 0 5px white; }
.lecture-option input:focus-visible + .lecture-option__body { outline: 3px solid rgba(103,86,173,.3); outline-offset: 2px; }
@media (hover: hover) { .lecture-option:hover .lecture-option__body { transform: translateY(-1px); border-color: #9c91d2; } }

.input-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px 18px; margin-top: 20px; }
.input-grid label, .text-area-label { display: grid; gap: 8px; }
.input-grid label > span, .text-area-label > span { font-size: 14px; font-weight: 700; }
input, textarea, button { font: inherit; }
.input-grid input, textarea { width: 100%; border: 1.5px solid var(--line); border-radius: 12px; background: #fbfcfd; color: var(--ink); transition: border-color .18s, box-shadow .18s, background .18s; }
.input-grid input { height: 54px; padding: 0 15px; }
textarea { resize: vertical; min-height: 125px; padding: 14px 15px; }
.input-grid input:focus, textarea:focus { outline: 0; border-color: var(--violet); background: white; box-shadow: 0 0 0 3px rgba(103,86,173,.1); }
::placeholder { color: #a2aab6; }

.chip-grid { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 24px; }
.chip-grid label { cursor: pointer; }
.chip-grid input { position: absolute; opacity: 0; pointer-events: none; }
.chip-grid span { display: block; padding: 11px 16px; border: 1.5px solid var(--line); border-radius: 999px; background: white; font-size: 14px; font-weight: 650; }
.chip-grid input:checked + span { color: white; border-color: var(--navy-soft); background: var(--navy-soft); }
.chip-grid input:focus-visible + span { outline: 3px solid rgba(103,86,173,.3); outline-offset: 2px; }

.consent-box { margin: 30px 0 22px; padding: 20px; border-radius: 14px; background: var(--wash); }
.consent-box label { display: flex; gap: 12px; cursor: pointer; }
.consent-box input { flex: 0 0 auto; width: 20px; height: 20px; margin: 2px 0 0; accent-color: var(--violet); }
.consent-box span { display: grid; gap: 5px; }
.consent-box small { color: var(--muted); }
.website-field { position: absolute; left: -9999px; }

.submit-button { display: flex; align-items: center; justify-content: center; gap: 12px; width: 100%; min-height: 62px; padding: 16px 24px; color: white; border: 0; border-radius: 14px; background: var(--navy); font-size: 17px; font-weight: 800; cursor: pointer; transition: background .18s, transform .18s, opacity .18s; }
.submit-button svg { width: 23px; height: 23px; fill: none; stroke: currentColor; stroke-width: 1.8; }
.submit-button:hover { background: #1d4067; transform: translateY(-1px); }
.submit-button:disabled { opacity: .55; cursor: wait; transform: none; }
.form-status { min-height: 24px; margin: 14px 0 0; text-align: center; font-size: 14px; font-weight: 700; }
.form-status.is-success { color: var(--success); }
.form-status.is-error { color: var(--danger); }

footer { padding: 0 20px 38px; color: #8a93a0; text-align: center; font-size: 12px; }

@media (max-width: 680px) {
  main { padding: 14px 12px 46px; }
  .hero, .form-card { border-radius: 21px; }
  .hero { min-height: 390px; padding: 47px 24px 30px; }
  .hero__steps { margin-top: 40px; gap: 7px; }
  .hero__steps span { padding: 13px 10px; font-size: 13px; }
  .hero__steps b { display: block; margin-bottom: 2px; }
  .hero__steps small { margin-left: 0; }
  .form-card { padding: 28px 20px; }
  .input-grid { grid-template-columns: 1fr; }
  .lecture-option__body { grid-template-columns: 69px 1fr 22px; gap: 12px; padding: 14px; }
  .lecture-option__date { padding-right: 12px; font-size: 17px; }
  .lecture-option__topic { font-size: 14px; }
  .field-help { margin-left: 43px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition: none !important; }
}