:root {
  --registration-ink: #123f39;
  --registration-green: #164d43;
  --registration-line: rgba(143, 112, 77, 0.27);
  --registration-field: rgba(255, 253, 249, 0.72);
}

.registration-section {
  position: relative;
  width: 100%;
  height: clamp(620px, 50vw, 760px);
  box-sizing: border-box;
  overflow: hidden;
  padding: clamp(25px, 2.3vw, 36px) clamp(42px, 6.7vw, 112px) clamp(22px, 2vw, 32px);
  background: #f5eee5 url("assets/registration-bg.webp") center / cover no-repeat;
  color: var(--registration-ink);
}

.registration-section * { box-sizing: border-box; }

.registration-section__topline {
  position: relative;
  z-index: 2;
  display: none;
  align-items: center;
  min-height: 20px;
  color: var(--registration-ink);
  font-family: "Noto Sans TC", sans-serif;
  font-size: clamp(9px, 0.75vw, 12px);
  font-weight: 600;
  letter-spacing: 0.28em;
}

.registration-section__brand {
  font-weight: 600;
  letter-spacing: 0.32em;
}

.registration-section__topline i {
  width: clamp(38px, 3.6vw, 60px);
  height: 1px;
  margin-left: clamp(14px, 1.5vw, 24px);
  background: rgba(172, 130, 82, 0.48);
}

.registration-section__label {
  margin-left: auto;
  color: rgba(18, 63, 57, 0.72);
  font-size: 0.82em;
  letter-spacing: 0.36em;
}

.registration-section__layout {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(300px, 37%) minmax(0, 63%);
  gap: clamp(42px, 5.4vw, 88px);
  width: 100%;
  max-width: 1500px;
  margin: clamp(17px, 1.7vw, 27px) auto 0;
}

.registration-intro {
  align-self: start;
  padding-top: clamp(65px, 8vw, 122px);
}

.registration-intro h2 {
  margin: 0;
  color: var(--registration-ink);
  font-family: "Noto Serif TC", serif;
  font-size: clamp(29px, 2.75vw, 44px);
  font-weight: 600;
  letter-spacing: 0.045em;
  line-height: 1.52;
}

.registration-intro h2 span { white-space: nowrap; }

.registration-intro p {
  margin: clamp(10px, 1vw, 16px) 0 0;
  font-family: "Noto Serif TC", serif;
  font-size: clamp(17px, 1.55vw, 26px);
  font-weight: 500;
  letter-spacing: 0.12em;
}

.registration-intro__rule {
  display: none;
  width: clamp(42px, 4.5vw, 74px);
  height: 1px;
  margin: clamp(15px, 1.4vw, 22px) 0 clamp(14px, 1.3vw, 20px);
  background: rgba(22, 77, 67, 0.62);
}

.registration-event {
  display: flex;
  align-items: center;
  gap: clamp(13px, 1.5vw, 22px);
  margin-top: clamp(19px, 2vw, 30px);
  font-family: "Noto Sans TC", sans-serif;
}

.registration-event__date {
  width: clamp(88px, 8vw, 112px);
  overflow: hidden;
  flex: none;
  border-radius: 9px;
  background: rgba(255, 253, 249, .89);
  box-shadow: 0 10px 28px rgba(69, 70, 54, .12);
  text-align: center;
}

.registration-event__date span {
  display: block;
  padding: 5px 0;
  background: #17615b;
  color: #fff;
  font-size: clamp(14px, 1.3vw, 18px);
  font-weight: 600;
}

.registration-event__date strong {
  display: block;
  padding: 8px 0 11px;
  color: #173e37;
  font-size: clamp(25px, 2.5vw, 34px);
  letter-spacing: -.02em;
  line-height: 1.1;
}

.registration-event__details { min-width: 0; }
.registration-event__details > span {
  display: block;
  margin-bottom: 7px;
  font-size: clamp(11px, .95vw, 14px);
  letter-spacing: .03em;
}

.registration-event__details strong {
  display: flex;
  align-items: center;
  gap: 7px;
  font-size: clamp(14px, 1.3vw, 19px);
  font-weight: 600;
  white-space: nowrap;
}

.registration-event__details svg {
  width: 19px;
  height: 19px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
}

.registration-countdown {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 5px 12px;
  margin-top: 16px;
  color: var(--registration-green);
  font-family: "Noto Sans TC", sans-serif;
  letter-spacing: .03em;
}

.registration-countdown__label {
  font-size: clamp(11px, .95vw, 13px);
  white-space: nowrap;
}

.registration-countdown__time {
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  font-variant-numeric: tabular-nums;
}
.registration-countdown__time b { font-size: clamp(19px, 1.9vw, 27px); line-height: 1; }
.registration-countdown__time small { margin-right: 3px; font-size: 11px; }

.registration-form {
  display: grid;
  gap: clamp(8px, 0.7vw, 11px);
  min-width: 0;
}

.registration-form__group {
  min-width: 0;
  margin: 0;
  padding: 0 0 clamp(8px, 0.75vw, 12px);
  border: 0;
  border-bottom: 1px solid var(--registration-line);
}

.registration-form__group legend {
  width: 100%;
  margin: 0 0 clamp(7px, 0.65vw, 10px);
  padding: 0;
  font-family: "Noto Serif TC", serif;
  font-size: clamp(14px, 1.18vw, 19px);
  font-weight: 700;
  letter-spacing: 0.035em;
}

.registration-form__group legend b,
.registration-field > span b {
  color: inherit;
  font-family: inherit;
  font-weight: 700;
}

.registration-form__group--basic {
  display: grid;
  grid-template-columns: 1fr 1fr;
  column-gap: clamp(16px, 1.65vw, 27px);
  row-gap: clamp(7px, 0.65vw, 10px);
}

.registration-form__group--basic legend {
  display: flex;
  align-items: center;
  gap: 14px;
  grid-column: 1 / -1;
}

.registration-form__group--basic legend i {
  display: inline-block;
  width: clamp(56px, 6vw, 96px);
  height: 1px;
  background: var(--registration-line);
}

.registration-field {
  display: grid;
  gap: 4px;
  min-width: 0;
}

.registration-field > span {
  color: #173f39;
  font-family: "Noto Sans TC", sans-serif;
  font-size: clamp(12px, 1vw, 16px);
  font-weight: 600;
  letter-spacing: 0.035em;
}

.registration-field input,
.registration-field select,
.registration-field textarea,
.registration-options__other {
  width: 100%;
  border: 1px solid rgba(78, 88, 84, 0.22);
  border-radius: 8px;
  outline: none;
  background: var(--registration-field);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.58);
  color: #263c37;
  font-family: "Noto Sans TC", sans-serif;
  font-size: clamp(12px, 0.96vw, 15px);
  transition: border-color 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.registration-field input,
.registration-field select {
  height: clamp(36px, 2.75vw, 44px);
  padding: 0 clamp(12px, 1.2vw, 19px);
}

.registration-field select {
  appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, #66726f 50%), linear-gradient(135deg, #66726f 50%, transparent 50%);
  background-position: calc(100% - 19px) 52%, calc(100% - 14px) 52%;
  background-repeat: no-repeat;
  background-size: 6px 6px, 6px 6px;
}

.registration-field textarea {
  min-height: clamp(52px, 4.2vw, 67px);
  padding: clamp(7px, 0.7vw, 11px);
  resize: vertical;
  line-height: 1.55;
}

.registration-field input::placeholder,
.registration-field textarea::placeholder,
.registration-options__other::placeholder {
  color: rgba(61, 72, 68, 0.46);
}

.registration-field input:focus,
.registration-field select:focus,
.registration-field textarea:focus,
.registration-options__other:focus {
  border-color: rgba(22, 77, 67, 0.62);
  background-color: rgba(255, 255, 255, 0.86);
  box-shadow: 0 0 0 3px rgba(22, 77, 67, 0.08);
}

.registration-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(6px, 0.55vw, 9px);
}

.registration-options label {
  position: relative;
  display: flex;
  min-height: clamp(34px, 2.7vw, 43px);
  align-items: center;
  gap: clamp(9px, 0.8vw, 13px);
  padding: 0 clamp(12px, 1.2vw, 18px);
  border: 1px solid rgba(78, 88, 84, 0.22);
  border-radius: 8px;
  background: var(--registration-field);
  color: #243b35;
  cursor: pointer;
  font-family: "Noto Sans TC", sans-serif;
  font-size: clamp(12px, 1vw, 16px);
  font-weight: 500;
  transition: border-color 160ms ease, background 160ms ease, color 160ms ease;
}

.registration-options label:has(input:checked) {
  border-color: var(--registration-green);
  background: rgba(22, 77, 67, 0.88);
  color: #fff;
}

.registration-options input[type="checkbox"] {
  appearance: none;
  display: grid;
  flex: 0 0 auto;
  width: clamp(18px, 1.55vw, 24px);
  aspect-ratio: 1;
  place-items: center;
  margin: 0;
  border: 1px solid rgba(74, 86, 81, 0.42);
  border-radius: 5px;
  background: rgba(255, 255, 255, 0.8);
}

.registration-options input[type="checkbox"]::after {
  width: 40%;
  height: 65%;
  border-right: 2px solid var(--registration-green);
  border-bottom: 2px solid var(--registration-green);
  content: "";
  opacity: 0;
  transform: translateY(-1px) rotate(45deg);
}

.registration-options input[type="checkbox"]:checked::after { opacity: 1; }

.registration-options__other-choice {
  grid-column: 1 / -1;
}

.registration-options__other {
  display: none;
  grid-column: 1 / -1;
  min-width: 0;
  min-height: clamp(34px, 2.7vw, 43px);
  padding: 0 clamp(12px, 1.2vw, 18px);
}

.registration-options__other-choice:has(input:checked) + .registration-options__other {
  display: block;
}

.registration-form__group--questions {
  display: grid;
  gap: clamp(8px, 0.7vw, 11px);
  padding-bottom: 0;
  border-bottom: 0;
}

.registration-submit {
  display: flex;
  width: 100%;
  min-height: clamp(40px, 3.3vw, 52px);
  align-items: center;
  justify-content: center;
  gap: 16px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(120deg, #174f45, #123f39);
  box-shadow: 0 8px 20px rgba(18, 63, 57, 0.13);
  color: #fff;
  font-family: "Noto Sans TC", sans-serif;
  font-size: clamp(14px, 1.1vw, 18px);
  font-weight: 500;
  letter-spacing: 0.08em;
}

.registration-submit b { font-size: 1.1em; font-weight: 400; }
.registration-submit:disabled { cursor: wait; opacity: 0.7; }

.registration-error {
  margin: 0;
  color: #8b3f36;
  font-size: 13px;
  text-align: center;
}

.registration-error[hidden] { display: none; }

.registration-privacy {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: -5px 0 0;
  color: rgba(43, 58, 54, 0.52);
  font-size: clamp(9px, 0.8vw, 12px);
  font-weight: 500;
  letter-spacing: 0.035em;
}

.registration-privacy svg {
  width: 15px;
  fill: rgba(43, 58, 54, 0.56);
  stroke: rgba(43, 58, 54, 0.56);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
}

@media (max-width: 900px) {
  .registration-section {
    height: auto;
    min-height: auto;
    padding: 34px 24px 44px;
    background-position: 25% center;
  }

  .registration-section__layout {
    grid-template-columns: 1fr;
    gap: 38px;
    max-width: 680px;
    margin-top: 36px;
  }

  .registration-section__topline { display: none; }

  .registration-intro {
    padding-top: 26px;
  }

  .registration-intro h2 { font-size: clamp(29px, 7vw, 42px); }
  .registration-intro p { font-size: clamp(18px, 4.8vw, 21px); }
  .registration-event { margin-top: 22px; }
  .registration-intro__rule { display: none; }
  .registration-countdown { margin-top: 16px; }

  .registration-form {
    gap: 16px;
    padding: 24px 20px 20px;
    border: 1px solid rgba(255, 255, 255, 0.66);
    border-radius: 20px;
    background: rgba(249, 245, 239, 0.78);
    box-shadow: 0 18px 50px rgba(83, 65, 47, 0.09);
    backdrop-filter: blur(8px);
  }

  .registration-field input,
  .registration-field select { height: 44px; }
  .registration-field textarea { min-height: 72px; padding: 10px; }
  .registration-options label,
  .registration-options__other { min-height: 43px; }
  .registration-submit { min-height: 48px; }
}

@media (max-width: 560px) {
  .registration-section {
    padding: 27px 16px 36px;
  }

  .registration-intro { padding: 8px 5px 0; }
  .registration-intro h2 { font-size: clamp(23px, 6.8vw, 28px); line-height: 1.48; }
  .registration-intro p { letter-spacing: 0.07em; }
  .registration-event__date { width: 89px; }
  .registration-event__details strong { font-size: clamp(14px, 4vw, 18px); }
  .registration-countdown__time b { font-size: clamp(20px, 5.5vw, 25px); }

  .registration-form {
    padding: 22px 15px 18px;
    border-radius: 16px;
  }

  .registration-form__group--basic { grid-template-columns: 1fr; }
  .registration-options { grid-template-columns: 1fr 1fr; }
  .registration-options__other { grid-column: 1 / -1; }
  .registration-options label { padding: 0 11px; }
  .registration-privacy { align-items: flex-start; line-height: 1.5; text-align: left; }
}