:root {
  --color-bg: #f8f5ef;
  --color-panel: rgba(255, 255, 255, 0.96);
  --color-panel-muted: rgba(245, 240, 231, 0.88);
  --color-text: #161514;
  --color-text-secondary: #5b554b;
  --color-text-muted: #857c70;
  --color-border: rgba(22, 21, 20, 0.12);
  --color-border-strong: rgba(22, 21, 20, 0.2);
  --color-grid: rgba(22, 21, 20, 0.05);
  --color-accent: #314a63;
  --color-accent-soft: rgba(49, 74, 99, 0.08);
  --color-accent-warm: #9b5a41;
  --color-success: #284f3d;
  --color-danger: #8b3a3a;
  --shadow-card: 0 24px 48px rgba(18, 16, 13, 0.08);
  --shadow-soft: 0 14px 28px rgba(18, 16, 13, 0.05);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-display: "Iowan Old Style", "Palatino Linotype", "Book Antiqua", "Songti SC", "Noto Serif SC", serif;
  --font-mono: "SF Mono", Monaco, "Cascadia Code", "Roboto Mono", Consolas, monospace;
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at top left, rgba(155, 90, 65, 0.1), transparent 28%),
    radial-gradient(circle at top right, rgba(49, 74, 99, 0.12), transparent 34%),
    var(--color-bg);
  color: var(--color-text);
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(var(--color-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-grid) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.48), transparent 76%);
  opacity: 0.58;
}

img {
  max-width: 100%;
}

a {
  color: inherit;
}

button,
input,
textarea,
select {
  font: inherit;
}

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(248, 245, 239, 0.94);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.nav-inner {
  width: 100%;
  padding: 0 clamp(20px, 2.2vw, 32px);
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  overflow: visible;
}

.nav-logo {
  height: 78px;
  width: auto;
  display: block;
}

.nav-menu {
  display: flex;
  gap: 28px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 15px;
  font-weight: 600;
  transition: opacity 0.2s;
}

.nav-menu a:hover,
.nav-menu a.is-current {
  opacity: 0.62;
}

.nav-toggle {
  display: none;
  background: none;
  border: 0;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-text);
  margin: 5px 0;
}

.page-shell {
  position: relative;
  z-index: 1;
}

.masthead {
  position: relative;
  overflow: hidden;
  padding: 128px 24px 52px;
}

.masthead + .section {
  padding-top: 40px;
}

.masthead::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.82), rgba(248, 245, 239, 0.52)),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.82));
  pointer-events: none;
}

.masthead-bg {
  position: absolute;
  inset: 0;
}

.masthead-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.85) contrast(0.92);
}

.masthead-inner {
  position: relative;
  z-index: 1;
  max-width: 1160px;
  margin: 0 auto;
  display: grid;
  gap: 32px;
  align-items: end;
}

.masthead-copy {
  max-width: 760px;
}

.page-kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  margin-bottom: 18px;
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(22, 21, 20, 0.08);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.page-title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 58px);
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.page-intro {
  margin: 0;
  max-width: 640px;
  font-size: 17px;
  color: var(--color-text-secondary);
}

.masthead-note {
  max-width: 460px;
  justify-self: end;
  padding: 22px 24px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(22, 21, 20, 0.08);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}

.masthead-note-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
}

.masthead-note p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.section {
  padding: 0 24px 56px;
}

.section-inner {
  max-width: 1160px;
  margin: 0 auto;
}

.grid-two {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-three {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 28px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.98), rgba(248, 244, 236, 0.9));
  border: 1px solid rgba(22, 21, 20, 0.1);
  border-radius: var(--radius-lg);
  box-shadow: 0 22px 44px rgba(18, 16, 13, 0.07);
  overflow: hidden;
}

.card-muted {
  background: linear-gradient(180deg, rgba(252, 250, 246, 0.92), rgba(245, 240, 231, 0.76));
  border-color: rgba(22, 21, 20, 0.08);
  box-shadow: 0 16px 30px rgba(18, 16, 13, 0.045);
}

.card-kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.card-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 28px;
  line-height: 1.25;
}

.card-text,
.card-list li,
.section-copy p,
.note-list li {
  margin: 0;
  font-size: 15px;
  color: var(--color-text-secondary);
}

.card-list,
.note-list {
  margin: 18px 0 0;
  padding-left: 18px;
  display: grid;
  gap: 10px;
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: auto;
  padding-top: 22px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
  transition: transform 0.2s, background 0.2s, border-color 0.2s;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  color: #fff;
  background: linear-gradient(135deg, var(--color-accent), #233548);
  border: 1px solid transparent;
  box-shadow: 0 12px 24px rgba(35, 53, 72, 0.16);
}

.button-secondary {
  color: var(--color-text);
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(22, 21, 20, 0.1);
}

.protocol-card {
  min-height: 100%;
  border-color: rgba(49, 74, 99, 0.14);
  box-shadow: 0 28px 54px rgba(18, 16, 13, 0.085);
}

.protocol-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 28px;
  right: 28px;
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(49, 74, 99, 0.78), rgba(49, 74, 99, 0.14));
}

.protocol-step {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  margin-bottom: 16px;
  border-radius: 50%;
  background: var(--color-accent-soft);
  color: var(--color-accent);
  font-family: var(--font-mono);
  font-size: 12px;
}

.section-header {
  margin-bottom: 28px;
}

.section-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 38px);
  line-height: 1.22;
}

.section-subtitle {
  margin: 0;
  max-width: 720px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-text-secondary);
}

.form-shell {
  display: grid;
  gap: 30px;
}

.info-strip {
  display: grid;
  gap: 22px;
  grid-template-columns: 1.2fr 0.8fr;
  align-items: start;
}

.info-strip-balanced {
  align-items: stretch;
}

.info-strip-balanced > .card {
  height: 100%;
}

.info-stack {
  display: grid;
  gap: 22px;
}

.quick-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: auto;
  padding-top: 20px;
}

.detail-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid var(--color-border);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--color-text-muted);
  text-transform: uppercase;
}

.form-card {
  padding: 36px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.86), rgba(250, 246, 239, 0.76));
  border-color: rgba(22, 21, 20, 0.08);
  box-shadow: 0 18px 36px rgba(18, 16, 13, 0.055);
  min-width: 0;
}

.form-header {
  margin-bottom: 30px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(22, 21, 20, 0.08);
}

.form-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 1.22;
}

.form-description {
  margin: 0;
  font-size: 15px;
  color: var(--color-text-secondary);
}

.form-panel {
  display: grid;
  gap: 26px;
  min-width: 0;
}

.form-section {
  padding: 26px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(246, 242, 235, 0.82));
  border: 1px solid var(--color-border);
  border-radius: 22px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.72);
  min-width: 0;
  min-inline-size: 0;
}

.form-section legend,
.form-section-title {
  width: 100%;
  margin: 0 0 14px;
  padding: 0;
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.24;
}

.form-section-note {
  margin: 2px 0 18px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.field-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  min-width: 0;
}

.field {
  display: grid;
  gap: 12px;
  min-width: 0;
}

.field-full {
  grid-column: 1 / -1;
}

.field-label {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  font-size: 14px;
  font-weight: 600;
}

.field-label small {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-muted);
}

.field-helper {
  margin-top: -6px;
  font-size: 12px;
  color: var(--color-text-muted);
}

.text-input,
.text-area,
.select-input,
.number-input {
  width: 100%;
  padding: 14px 16px;
  border: 1px solid rgba(22, 21, 20, 0.14);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.92);
  color: var(--color-text);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.75);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.text-input:focus,
.text-area:focus,
.select-input:focus,
.number-input:focus {
  outline: none;
  border-color: rgba(49, 74, 99, 0.48);
  box-shadow: 0 0 0 4px rgba(49, 74, 99, 0.1);
}

.text-area {
  min-height: 120px;
  resize: vertical;
}

.choice-grid {
  display: grid;
  gap: 10px;
}

.choice-grid.is-inline {
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
}

.choice-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 54px;
  padding: 14px 16px;
  border: 1px solid rgba(22, 21, 20, 0.12);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.88);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s, transform 0.2s;
}

.choice-card:hover {
  transform: translateY(-1px);
  border-color: rgba(22, 21, 20, 0.2);
}

.choice-card input {
  margin: 0;
  accent-color: var(--color-accent);
}

.choice-card span {
  font-size: 14px;
  line-height: 1.45;
}

.choice-card:has(input:checked) {
  background: rgba(49, 74, 99, 0.08);
  border-color: rgba(49, 74, 99, 0.36);
  color: var(--color-text);
}

.rating-grid {
  display: grid;
  gap: 0;
}

.rating-row {
  display: grid;
  gap: 16px;
  grid-template-columns: 1.4fr 1fr;
  align-items: start;
  padding: 18px 0;
  min-width: 0;
}

.rating-grid > .rating-row:first-child {
  padding-top: 0;
}

.rating-grid > .rating-row + .rating-row {
  border-top: 1px solid rgba(22, 21, 20, 0.08);
}

.rating-grid > .field {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid rgba(22, 21, 20, 0.08);
}

.rating-copy {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.rating-question {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.55;
}

.rating-helper {
  font-size: 12px;
  color: var(--color-text-muted);
}

.rating-options {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  min-width: 0;
}

.rating-options .choice-card {
  justify-content: center;
  min-height: 56px;
  padding: 12px 10px;
  min-width: 0;
}

.rating-options .choice-card span {
  font-size: 13px;
  font-weight: 600;
}

.compact-grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.inline-pair {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.subtle-note {
  padding: 16px 18px;
  border-left: 3px solid var(--color-accent-warm);
  background: rgba(255, 255, 255, 0.76);
  border-radius: 0 16px 16px 0;
  font-size: 13px;
  color: var(--color-text-secondary);
}

.status-panel {
  display: none;
  padding: 18px 20px;
  border-radius: 18px;
  font-size: 14px;
}

.status-panel.is-visible {
  display: grid;
  gap: 8px;
}

.status-panel.is-success {
  background: rgba(40, 79, 61, 0.1);
  border: 1px solid rgba(40, 79, 61, 0.18);
  color: var(--color-success);
}

.status-panel.is-error {
  background: rgba(139, 58, 58, 0.08);
  border: 1px solid rgba(139, 58, 58, 0.16);
  color: var(--color-danger);
}

.status-title {
  margin: 0;
  font-weight: 700;
}

.status-copy {
  margin: 0;
  line-height: 1.7;
}

.submit-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
  margin-top: 10px;
  padding-top: 4px;
}

.submit-note {
  font-size: 12px;
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 680px;
}

.submit-button {
  min-width: 184px;
  border: 0;
  cursor: pointer;
}

.submit-button[disabled] {
  opacity: 0.68;
  cursor: wait;
  transform: none;
}

.utility-copy {
  display: grid;
  gap: 14px;
}

.utility-copy p {
  margin: 0;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.footer {
  background: #1a1a1a;
  color: #fff;
  padding: 60px clamp(24px, 2.2vw, 32px) 40px;
}

.footer-inner {
  width: 100%;
}

.footer-contact {
  max-width: 360px;
  padding-bottom: 28px;
  margin-bottom: 28px;
}

.footer-contact-title {
  font-size: 18px;
  font-weight: 600;
  font-family: var(--font-display);
  color: #fff;
  margin: 0 0 14px;
}

.footer-contact-info {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.72);
  line-height: 1.8;
  margin: 0;
}

.footer-bottom {
  padding-top: 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-disclaimer {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.6;
  margin: 0;
}

.footer-copyright {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.5);
  line-height: 1.6;
  margin: 0;
}

[hidden] {
  display: none !important;
}

@media (max-width: 960px) {
  .masthead-inner,
  .info-strip,
  .rating-row,
  .grid-two,
  .grid-three,
  .field-grid,
  .compact-grid,
  .inline-pair {
    grid-template-columns: 1fr;
  }

  .masthead-note {
    justify-self: stretch;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 0 18px 40px;
  }

  .nav-inner {
    height: 55px;
  }

  .nav-logo {
    height: 56px;
  }

  .nav-menu {
    position: fixed;
    top: 55px;
    left: 0;
    right: 0;
    background: rgba(248, 245, 239, 0.98);
    flex-direction: column;
    padding: 24px;
    gap: 0;
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s;
    border-bottom: 1px solid var(--color-border);
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav-menu li {
    border-bottom: 1px solid var(--color-border);
  }

  .nav-menu li:last-child {
    border-bottom: 0;
  }

  .nav-menu a {
    display: block;
    padding: 16px 0;
    font-size: 16px;
  }

  .nav-toggle {
    display: block;
  }

  .masthead {
    padding-top: 110px;
    padding-bottom: 40px;
  }

  .masthead + .section {
    padding-top: 24px;
  }

  .page-title {
    font-size: 38px;
  }

  .page-intro {
    font-size: 16px;
  }

  .card,
  .form-card,
  .form-section {
    padding: 22px;
    border-radius: 22px;
  }

  .form-header {
    margin-bottom: 24px;
    padding-bottom: 18px;
  }

  .form-panel {
    gap: 22px;
  }

  .field-grid,
  .info-strip,
  .info-stack,
  .grid-two,
  .grid-three {
    gap: 18px;
  }

  .rating-row {
    gap: 10px;
    padding: 14px 0;
  }

  .rating-options {
    gap: 8px;
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .rating-options .choice-card {
    min-height: 52px;
    padding: 10px 0;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .submit-row {
    align-items: stretch;
  }

  .submit-button {
    width: 100%;
    min-width: 0;
  }
}

@media (min-width: 769px) {
  .masthead {
    min-height: clamp(420px, 44vw, 520px);
    display: flex;
    align-items: center;
  }

  .masthead-inner {
    width: 100%;
    gap: 0;
    align-items: center;
  }

  .footer-bottom {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
    align-items: start;
  }

  .footer-copyright {
    text-align: right;
    white-space: nowrap;
  }
}