:root {
  color-scheme: light;
  --ink: #231f1a;
  --muted: #6f665e;
  --line: #ded6cc;
  --surface: #fbf8f2;
  --surface-strong: #f4ebe0;
  --accent: #7d624d;
  --accent-dark: #4b372b;
  --button-text: #fffaf3;
  --success: #386b53;
  --danger: #9c312b;
  --focus: #1d6f8f;
  --font-body: Nunito, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --font-display: Nunito, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  --icon-mark-outer: #c89678;
  --icon-mark-inner: #fff6dc;
  --icon-mark-glow: #e7b1a3;
  --type-brand-size: 1.04rem;
  --type-brand-weight: 760;
  --type-label-size: 0.76rem;
  --type-label-weight: 800;
  --type-control-weight: 760;
  font-family: var(--font-body);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100%;
  overflow: hidden;
  background:
    radial-gradient(circle at 76% 12%, rgba(190, 226, 222, 0.45), transparent 34%),
    radial-gradient(circle at 18% 22%, rgba(255, 247, 238, 0.92), transparent 38%),
    linear-gradient(120deg, #f7f0e6 0%, #edf6f3 58%, #e4f3f0 100%);
  color: var(--ink);
  line-height: 1.5;
  overscroll-behavior: none;
}

[hidden] {
  display: none !important;
}

img {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea {
  font: inherit;
}

:focus-visible {
  outline: 0.1875rem solid var(--focus);
  outline-offset: 0.1875rem;
}

.page-stack {
  position: relative;
  --panel-progress: 0;
  width: 100%;
  height: 100svh;
  overflow: hidden;
  background:
    linear-gradient(rgba(74, 98, 92, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(74, 98, 92, 0.055) 1px, transparent 1px),
    radial-gradient(circle at 78% 12%, rgba(187, 228, 223, 0.52), transparent 36%),
    linear-gradient(120deg, #f7f0e6 0%, #eff6f1 58%, #dff1ee 100%);
  background-size:
    2rem 2rem,
    2rem 2rem,
    auto,
    auto;
  touch-action: pan-y;
}

.page-stack::before,
.page-stack::after {
  position: absolute;
  inset: auto auto 0 auto;
  z-index: 0;
  width: min(72vw, 47.5rem);
  height: min(72vw, 47.5rem);
  background: url("./assets/sloth-resting.png") center / contain no-repeat;
  content: "";
  opacity: 0.09;
  pointer-events: none;
}

.page-stack::before {
  right: -22vw;
  bottom: 16svh;
  width: min(118vw, 47.5rem);
  height: min(118vw, 47.5rem);
  opacity: 0.105;
}

.page-stack::after {
  top: 28svh;
  left: 24vw;
  width: min(92vw, 38.75rem);
  height: min(92vw, 38.75rem);
  background-image: url("./assets/sloth-resting.png");
  opacity: 0.052;
}

.page-stack.is-dragging .page {
  transition: none;
}

.page {
  position: absolute;
  inset: 0;
  display: flex;
  --page-gutter: clamp(1.125rem, 5vw, 1.5rem);
  width: 100%;
  max-width: 100vw;
  min-height: 100%;
  overflow-x: hidden;
  overflow-y: auto;
  padding: clamp(1rem, 4.4vw, 1.375rem) var(--page-gutter)
    max(1.375rem, env(safe-area-inset-bottom));
  background: transparent;
  transition:
    transform 620ms cubic-bezier(0.2, 0.78, 0.22, 1),
    opacity 420ms ease,
    filter 620ms ease;
  -webkit-overflow-scrolling: touch;
}

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

.page-header {
  position: relative;
  z-index: 3;
  display: flex;
  width: 100%;
  max-width: 21.375rem;
  min-height: 2.5rem;
  align-items: center;
  justify-content: space-between;
  align-self: flex-start;
}

.brand,
.back-link {
  display: inline-flex;
  align-items: center;
}

.brand {
  gap: 0.625rem;
  font-size: var(--type-brand-size);
  font-weight: var(--type-brand-weight);
  color: var(--ink);
}

.brand-mark {
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 62.4375rem;
  background:
    radial-gradient(circle at 52% 46%, var(--icon-mark-inner) 0 22%, transparent 23%),
    linear-gradient(135deg, var(--icon-mark-outer), var(--icon-mark-glow));
  box-shadow:
    0 0 0 0.25rem rgba(255, 255, 255, 0.62),
    0 0 0 1px rgba(52, 95, 83, 0.14);
}

.back-link {
  min-height: 2.5rem;
  color: var(--accent-dark);
  font-size: 0.95rem;
  font-weight: var(--type-control-weight);
}

.intro-page {
  flex-direction: column;
  align-items: flex-start;
  gap: clamp(0.375rem, 1svh, 0.625rem);
  z-index: 1;
  overflow-x: hidden;
  overflow-y: auto;
  padding-bottom: max(6.75rem, env(safe-area-inset-bottom));
  opacity: calc(1 - (var(--panel-progress) * 0.28));
  filter: blur(calc(var(--panel-progress) * 0.0625rem));
  transform: translate3d(0, calc(var(--panel-progress) * -4svh), 0)
    scale(calc(1 - (var(--panel-progress) * 0.015)));
}

.intro-art {
  flex: 0 0 auto;
  width: 100%;
  max-width: min(34rem, calc(100vw - 1.5rem));
  max-height: 28svh;
  align-self: center;
  padding: 0;
  pointer-events: none;
}

.intro-art img {
  width: 100%;
  max-height: 28svh;
  margin-inline: auto;
  object-fit: contain;
  filter: drop-shadow(0 1rem 1.625rem rgba(52, 95, 83, 0.16));
  animation: softFloat 7s ease-in-out infinite alternate;
}

.intro-copy {
  position: relative;
  z-index: 2;
  flex: 0 0 auto;
  width: 100%;
  max-width: 21.375rem;
  min-width: 0;
  align-self: flex-start;
}

.eyebrow {
  margin: 0 0 0.5rem;
  color: var(--accent);
  font-size: var(--type-label-size);
  font-weight: var(--type-label-weight);
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
p {
  margin-top: 0;
}

h1,
h2 {
  font-family: var(--font-display);
  font-weight: 860;
  letter-spacing: 0;
}

h1 {
  max-width: 100%;
  margin-bottom: 0.5rem;
  background: linear-gradient(105deg, #22342e 0%, #7a5948 42%, #2f8c8b 100%);
  background-clip: text;
  color: #22342e;
  font-size: clamp(1.95rem, 8.8vw, 3.45rem);
  line-height: 0.98;
  overflow-wrap: break-word;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: pre-line;
}

.intro-line {
  max-width: min(100%, 34rem);
  margin-bottom: 0;
  color: var(--muted);
  font-size: clamp(0.78rem, 3vw, 0.94rem);
  font-weight: 650;
  line-height: 1.42;
  overflow-wrap: break-word;
}

.intro-details {
  position: relative;
  display: block;
  width: 100%;
  height: clamp(10.75rem, 24svh, 12.25rem);
  max-width: 24.375rem;
  align-self: flex-start;
  border: 0;
  cursor: grab;
  touch-action: pan-y;
  --card-drag: 0;
  contain: layout paint;
}

.intro-details:focus {
  outline: none;
}

.intro-details:focus-visible {
  border-radius: 0.75rem;
  outline: 0.125rem solid rgba(29, 111, 143, 0.34);
  outline-offset: 0.3125rem;
}

.intro-feature {
  position: absolute;
  inset: 0.1875rem 1.75rem 0.75rem 0;
  display: flex;
  min-height: 0;
  flex-direction: column;
  justify-content: center;
  gap: 0.55rem;
  border: 1px solid rgba(47, 140, 139, 0.42);
  border-radius: 0.5rem;
  background:
    linear-gradient(110deg, rgba(255, 255, 255, 0.84), transparent 42%),
    linear-gradient(145deg, rgba(255, 253, 248, 0.99), rgba(246, 238, 228, 0.96));
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.82) inset,
    0 1.125rem 2.25rem rgba(48, 86, 78, 0.12),
    0 0.25rem 0.75rem rgba(125, 98, 77, 0.08);
  min-width: 0;
  overflow: hidden;
  padding: 1.125rem 1.25rem;
  pointer-events: none;
  transition:
    opacity 180ms ease,
    transform 220ms cubic-bezier(0.2, 0.78, 0.22, 1);
  backface-visibility: hidden;
  contain: layout paint style;
  user-select: none;
  will-change: transform;
}

.intro-feature::before,
.intro-feature::after {
  position: absolute;
  content: "";
  pointer-events: none;
}

.intro-feature::before {
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255, 250, 240, 0.72), transparent 44%),
    linear-gradient(90deg, rgba(56, 107, 83, 0.075), transparent 34%);
}

.intro-feature::after {
  top: 0.875rem;
  bottom: 0.875rem;
  left: 0;
  width: 0.1875rem;
  border-radius: 0 62.4375rem 62.4375rem 0;
  background: linear-gradient(180deg, rgba(56, 107, 83, 0.68), rgba(125, 98, 77, 0.46));
}

.intro-feature > * {
  position: relative;
  z-index: 1;
}

.intro-details.is-card-dragging {
  cursor: grabbing;
}

.intro-details.is-card-dragging .intro-feature {
  transition: none;
}

.intro-feature[data-card-position="active"] {
  z-index: 4;
  opacity: 1;
  pointer-events: auto;
  transform: translate3d(calc(var(--card-drag) * 0.0625rem), 0, 0)
    rotate(calc(var(--card-drag) * 0.018deg));
}

.intro-feature[data-card-position="next"] {
  z-index: 3;
  opacity: 1;
  transform: translate3d(1.125rem, 0.4375rem, 0) scale(0.965);
}

.intro-feature[data-card-position="after"] {
  z-index: 2;
  opacity: 1;
  transform: translate3d(2.125rem, 0.875rem, 0) scale(0.93);
}

.intro-feature[data-card-position="hidden"] {
  z-index: 1;
  opacity: 0;
  transform: translate3d(3rem, 1.125rem, 0) scale(0.9);
}

.intro-feature[data-card-position="next"],
.intro-feature[data-card-position="after"] {
  border-color: rgba(47, 140, 139, 0.24);
  background:
    linear-gradient(110deg, rgba(255, 255, 255, 0.58), transparent 44%),
    linear-gradient(145deg, rgba(255, 253, 248, 0.84), rgba(245, 238, 228, 0.8));
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.54) inset,
    0 0.75rem 1.5rem rgba(48, 86, 78, 0.065);
}

.intro-feature[data-card-position="next"] > *,
.intro-feature[data-card-position="after"] > * {
  opacity: 0.16;
}

.intro-feature[data-card-position="next"]::before,
.intro-feature[data-card-position="after"]::before,
.intro-feature[data-card-position="next"]::after,
.intro-feature[data-card-position="after"]::after {
  opacity: 0.42;
}

.intro-feature h2 {
  margin: 0;
  color: var(--accent-dark);
  font-family: var(--font-body);
  font-size: var(--card-title-size, clamp(0.9rem, 2.7vw, 1.04rem));
  font-weight: 840;
  line-height: 1.16;
}

.intro-feature p {
  margin: 0;
  color: #536a63;
  overflow: visible;
  font-size: var(--card-body-size, clamp(0.72rem, 2.18vw, 0.84rem));
  font-weight: 620;
  line-height: 1.34;
}

.intro-price {
  width: 100%;
  max-width: 24.375rem;
  margin: -0.25rem 0 0;
  align-self: flex-start;
  color: var(--accent-dark);
  font-size: 1.04rem;
  font-weight: 840;
  letter-spacing: 0.01em;
}

.intro-specs {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.5rem;
  width: 100%;
  max-width: 24.375rem;
  align-self: flex-start;
  align-items: center;
}

.intro-specs p {
  display: inline-flex;
  min-height: 2.5rem;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  border: 1px solid rgba(219, 211, 201, 0.78);
  border-radius: 62.4375rem;
  background: rgba(255, 252, 247, 0.72);
  color: var(--ink);
  font-size: clamp(0.84rem, 2.6vw, 0.95rem);
  font-weight: 760;
  line-height: 1.2;
  padding: 0.5rem 1rem 0.5rem 0.9375rem;
  backdrop-filter: blur(0.625rem);
}

.intro-specs p:not(.specs-title)::before {
  flex: 0 0 auto;
  width: 0.4375rem;
  height: 0.4375rem;
  border-radius: 62.4375rem;
  background: rgba(47, 140, 139, 0.42);
  content: "";
}

.intro-specs .specs-title {
  grid-column: 1 / -1;
  min-height: 0;
  border: 0;
  background: transparent;
  color: var(--accent);
  font-size: clamp(0.66rem, 2vw, 0.72rem);
  font-weight: 840;
  padding: 0;
  text-align: left;
  text-transform: uppercase;
  backdrop-filter: none;
}

.swipe-cue {
  position: absolute;
  right: 0;
  bottom: max(0.5rem, env(safe-area-inset-bottom));
  left: 0;
  z-index: 8;
  display: flex;
  width: 100%;
  height: 1.75rem;
  align-items: center;
  justify-content: center;
  opacity: calc((1 - var(--panel-progress)) * 0.58);
  pointer-events: none;
  transition: opacity 220ms ease;
}

.swipe-cue::before {
  width: 2.25rem;
  height: 1.125rem;
  border: 1px solid rgba(52, 95, 83, 0.18);
  border-radius: 62.4375rem;
  background: rgba(255, 255, 255, 0.54);
  content: "";
  backdrop-filter: blur(0.75rem);
}

.swipe-cue span {
  position: absolute;
  left: 50%;
  width: 0.625rem;
  height: 0.625rem;
  border-right: 2px solid rgba(52, 95, 83, 0.56);
  border-bottom: 2px solid rgba(52, 95, 83, 0.56);
  transform: translateX(-50%) rotate(45deg);
  animation: cueDrift 1.55s ease-in-out infinite;
}

.bottom-action,
.submit-button {
  display: inline-flex;
  min-height: 3.375rem;
  align-items: center;
  justify-content: center;
  border: 0;
  border-radius: 62.4375rem;
  background: linear-gradient(100deg, #345f53 0%, #6f4d39 100%);
  color: var(--button-text);
  cursor: pointer;
  font-size: 0.98rem;
  font-weight: var(--type-control-weight);
  transition:
    transform 180ms ease,
    background 180ms ease,
    box-shadow 180ms ease;
}

.bottom-action {
  position: absolute;
  bottom: max(2.875rem, calc(env(safe-area-inset-bottom) + 2.875rem));
  left: 0;
  right: 0;
  margin-inline: auto;
  z-index: 4;
  width: calc(100% - var(--page-gutter) - var(--page-gutter));
  max-width: 21.375rem;
  padding-inline: 1.125rem;
  box-shadow: 0 1.25rem 2.875rem rgba(52, 95, 83, 0.23);
}

.bottom-action:hover,
.submit-button:hover {
  background: linear-gradient(100deg, #284c42 0%, #5f412f 100%);
  transform: translateY(-0.125rem);
}

.form-page {
  flex-direction: column;
  align-items: center;
  gap: 1.5rem;
  background: rgba(246, 243, 236, 0.48);
  z-index: 5;
  pointer-events: none;
  transform: translate3d(0, calc((1 - var(--panel-progress)) * 100%), 0);
  box-shadow: 0 -1.75rem 4.375rem rgba(48, 86, 78, 0.18);
  backdrop-filter: blur(1.125rem);
}

.page-stack.form-active .intro-page {
  opacity: calc(1 - (var(--panel-progress) * 0.28));
  transform: translate3d(0, calc(var(--panel-progress) * -4svh), 0)
    scale(calc(1 - (var(--panel-progress) * 0.015)));
  filter: blur(calc(var(--panel-progress) * 0.0625rem));
}

.page-stack.form-active .form-page {
  pointer-events: auto;
}

.form-header {
  width: 100%;
  max-width: 21.375rem;
  margin-bottom: 0.75rem;
}

.form-intro h2 {
  max-width: 100%;
  margin-bottom: 0.875rem;
  font-size: clamp(1.95rem, 8.1vw, 2.8rem);
  line-height: 1.05;
}

.form-intro,
.feedback-form {
  width: 100%;
  max-width: 21.375rem;
}

.form-intro p:not(.eyebrow) {
  max-width: 34rem;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 1rem;
  font-weight: 620;
}

.feedback-form {
  display: grid;
  gap: 0.625rem;
  min-width: 0;
  border: 1px solid rgba(191, 212, 207, 0.76);
  border-radius: 0.625rem;
  background: rgba(255, 252, 246, 0.7);
  box-shadow: 0 1.5rem 5.125rem rgba(48, 86, 78, 0.16);
  padding: 1.125rem;
  backdrop-filter: blur(1.125rem);
}

/* 蜜罐字段：移出可视区域，对真人不可见、不可聚焦 */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.field-group,
.interest-field {
  display: grid;
  gap: 0.4375rem;
  min-width: 0;
  margin: 0;
  padding: 0;
  border: 0;
}

.field-group > label,
.interest-field > legend {
  color: var(--accent-dark);
  font-size: 0.94rem;
  font-weight: var(--type-control-weight);
}

.form-grid {
  display: grid;
  gap: 0.75rem;
}

input[type="email"],
input[type="text"],
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.58);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
  font-weight: 680;
  transition:
    border-color 160ms ease,
    box-shadow 160ms ease,
    background 160ms ease;
}

input[type="email"],
input[type="text"],
select {
  min-height: 3.25rem;
  padding: 0 0.875rem;
}

select {
  appearance: auto;
}

select option {
  font: inherit;
}

textarea {
  min-height: 8.25rem;
  resize: vertical;
  padding: 0.875rem 0.875rem 1.875rem;
}

input[type="email"]:focus,
input[type="text"]:focus,
select:focus,
textarea:focus {
  border-color: rgba(47, 140, 139, 0.72);
  background: #fff;
  box-shadow: 0 0 0 0.25rem rgba(47, 140, 139, 0.12);
  outline: 0;
}

.interest-options {
  display: grid;
  gap: 0.5rem;
  min-width: 0;
}

.interest-options label {
  position: relative;
  min-height: 3.25rem;
  min-width: 0;
  display: flex;
  align-items: center;
  border: 1px solid var(--line);
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.48);
  color: var(--ink);
  cursor: pointer;
  padding: 0.75rem 0.875rem 0.75rem 2.625rem;
}

.interest-options label span:not(.color-dot) {
  min-width: 0;
  overflow-wrap: anywhere;
}

.interest-options input {
  position: absolute;
  left: 0.875rem;
  width: 1rem;
  height: 1rem;
  accent-color: var(--accent-dark);
}

.color-options input {
  opacity: 0;
}

.color-options,
.feature-options {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.color-dot {
  position: absolute;
  left: 0.875rem;
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 62.4375rem;
  box-shadow: inset 0 0 0 1px rgba(36, 49, 45, 0.08);
}

.color-cream {
  background: #efcb91;
}

.color-cocoa {
  background: #8b5b45;
}

.color-blush {
  background: #eda6a1;
}

.color-lavender {
  background: #bfa4ce;
}

.color-mint {
  background: #9fc9bd;
}

.color-sky-blue {
  background: #acd0e2;
}

.color-honey {
  background: #edc86b;
}

.color-coral {
  background: #ed9a7f;
}

.interest-options label:has(input:checked) {
  border-color: rgba(47, 140, 139, 0.74);
  background: rgba(238, 249, 246, 0.72);
}

.message-box {
  position: relative;
}

.message-meta {
  position: absolute;
  right: 0.75rem;
  bottom: 0.625rem;
  color: var(--muted);
  font-size: 0.82rem;
  pointer-events: none;
}

.field-error {
  min-height: 1.25em;
  margin: 0;
  color: var(--danger);
  font-size: 0.86rem;
}

.field-error:empty {
  display: none;
}

.submit-button {
  width: 100%;
  min-height: 3.375rem;
  margin-top: 0.125rem;
}

.submit-button[disabled] {
  cursor: progress;
  opacity: 0.72;
}

.privacy-note,
.success-message {
  margin: 0;
  font-size: 0.9rem;
}

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

.success-message {
  min-height: 1.4em;
  color: var(--success);
  font-weight: var(--type-control-weight);
}

.success-message.is-error {
  color: var(--danger);
}

.success-dialog {
  width: min(92vw, 22rem);
  padding: 0;
  border: none;
  border-radius: 1.25rem;
  background: var(--surface);
  color: var(--ink);
  box-shadow: 0 1.5rem 3.5rem rgba(36, 49, 45, 0.28);
  overflow: hidden;
}

.success-dialog::backdrop {
  background: rgba(36, 49, 45, 0.46);
  backdrop-filter: blur(2px);
}

.success-dialog[open] {
  animation: successDialogIn 240ms ease;
}

.success-dialog[open]::backdrop {
  animation: successBackdropIn 240ms ease;
}

.success-dialog-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  padding: 2.25rem 1.75rem 1.75rem;
  text-align: center;
}

.success-dialog-icon {
  display: grid;
  place-items: center;
  width: 3.25rem;
  height: 3.25rem;
  border-radius: 50%;
  background: var(--surface-strong);
  color: var(--success);
}

.success-dialog-icon::before {
  content: "";
  width: 1.15rem;
  height: 0.62rem;
  border-left: 0.2rem solid currentColor;
  border-bottom: 0.2rem solid currentColor;
  transform: translateY(-0.12rem) rotate(-45deg);
}

.success-dialog-text {
  margin: 0;
  font-size: 1rem;
  line-height: 1.5;
  color: var(--ink);
}

.success-dialog-close {
  margin-top: 0.25rem;
  padding: 0.7rem 2rem;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: var(--button-text);
  font: inherit;
  font-weight: var(--type-control-weight);
  cursor: pointer;
  transition: background 160ms ease;
}

.success-dialog-close:hover {
  background: var(--accent-dark);
}

.success-dialog-close:focus-visible {
  outline: 0.18rem solid var(--focus);
  outline-offset: 0.18rem;
}

@keyframes successDialogIn {
  from {
    opacity: 0;
    transform: translateY(0.75rem) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

@keyframes successBackdropIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .success-dialog[open],
  .success-dialog[open]::backdrop {
    animation: none;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(1.125rem);
  transition:
    opacity 640ms ease,
    transform 640ms ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes softFloat {
  from {
    transform: translateY(0) rotate(-0.3deg);
  }

  to {
    transform: translateY(-0.5rem) rotate(0.4deg);
  }
}

@keyframes cueDrift {
  0%,
  100% {
    opacity: 0.35;
    transform: translateX(-50%) translateY(-0.3125rem) rotate(45deg);
  }

  50% {
    opacity: 0.95;
    transform: translateX(-50%) translateY(0.125rem) rotate(45deg);
  }
}

@media (min-width: 45rem) {
  .page {
    display: grid;
    padding: 1.75rem clamp(2.5rem, 7vw, 6rem) 2.625rem;
  }

  .page-header {
    max-width: none;
  }

  .intro-page {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(26.25rem, 1.1fr);
    grid-template-rows: auto 1fr auto;
    column-gap: clamp(2.5rem, 7vw, 6.875rem);
    align-items: end;
  }

  .intro-page .page-header {
    grid-column: 1 / -1;
  }

  .intro-art {
    grid-column: 2;
    grid-row: 2 / 4;
    align-self: center;
    width: auto;
    max-height: none;
    max-width: none;
  }

  .intro-art img {
    width: min(72vw, 62rem);
    max-height: none;
    max-width: none;
  }

  .intro-copy,
  .intro-details,
  .intro-price,
  .intro-specs,
  .bottom-action {
    grid-column: 1;
    width: auto;
    max-width: none;
    align-self: auto;
  }

  .intro-details {
    width: min(44vw, 30.625rem);
    height: clamp(11.5rem, 24svh, 13.25rem);
  }

  .intro-feature {
    inset: 0.1875rem 2.5rem 0.875rem 0;
    padding: 1.25rem 1.375rem;
  }

  .bottom-action {
    position: relative;
    grid-column: 1 / -1;
    justify-self: center;
    bottom: auto;
    left: auto;
    width: fit-content;
    min-width: 16.25rem;
    padding-inline: 1.625rem;
  }

  .swipe-cue {
    bottom: 1.125rem;
  }

  .form-page {
    display: grid;
    grid-template-columns: minmax(18rem, 0.58fr) minmax(0, 1fr);
    column-gap: clamp(1.5rem, 4vw, 4rem);
    align-items: start;
    justify-content: center;
    max-width: none;
    margin-inline: auto;
  }

  .form-header {
    grid-column: 1 / -1;
    width: auto;
    max-width: none;
  }

  .form-intro {
    position: sticky;
    top: 2rem;
    width: auto;
    justify-self: auto;
    border: 1px solid rgba(191, 212, 207, 0.5);
    border-radius: 0.625rem;
    background: rgba(255, 252, 246, 0.48);
    box-shadow: 0 1.5rem 4.5rem rgba(48, 86, 78, 0.1);
    padding: 1.375rem;
    backdrop-filter: blur(1rem);
  }

  .feedback-form {
    width: 100%;
    max-width: none;
    justify-self: stretch;
  }

  .form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .interest-options {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .color-options {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .intent-options {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 45rem) and (max-width: 68rem) {
  .intro-page {
    grid-template-columns: minmax(20rem, 0.82fr) minmax(20rem, 1fr);
    column-gap: clamp(1.5rem, 3vw, 2.5rem);
    padding-inline: clamp(1.5rem, 4vw, 3rem);
  }

  .intro-art img {
    width: min(66vw, 52rem);
  }

  h1 {
    font-size: clamp(2.35rem, 5.4vw, 3rem);
    overflow-wrap: normal;
    word-break: normal;
  }

  .intro-details {
    width: min(100%, 28rem);
  }

  .intro-specs {
    max-width: 28rem;
  }

  .form-page {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    max-width: none;
    margin-inline: 0;
  }

  .form-header,
  .form-intro,
  .feedback-form {
    width: 100%;
    max-width: none;
  }

  .form-intro {
    position: relative;
    top: auto;
    justify-self: auto;
  }

  .form-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .intent-options {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-height: 43.125rem) and (max-width: 32.5rem) {
  .intro-page {
    min-height: 100svh;
    gap: 0.625rem;
  }

  .intro-art,
  .intro-art img {
    max-height: 20svh;
  }

  .intro-art img {
    width: min(94vw, 28rem);
  }

  h1 {
    font-size: clamp(1.78rem, 7.9vw, 2.72rem);
  }

  .intro-details {
    height: 11.25rem;
  }

  .intro-feature {
    padding-block: 1rem;
  }

  .intro-feature h2 {
    margin-bottom: 0;
  }

  .intro-specs {
    gap: 0.375rem;
  }

  .bottom-action {
    min-height: 3.25rem;
  }
}

/* 竖屏平板（如 iPad Mini 768×1024）：介绍页回到竖向堆叠，避免双栏布局头重脚轻 */
@media (min-width: 45rem) and (max-width: 63.99rem) and (orientation: portrait) {
  .page {
    display: flex;
  }
  .intro-page {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: clamp(0.75rem, 2svh, 1.25rem);
  }
  .page-header,
  .intro-copy,
  .intro-details,
  .intro-specs,
  .bottom-action {
    grid-column: auto;
    grid-row: auto;
  }
  .intro-art {
    grid-column: auto;
    grid-row: auto;
    align-self: center;
    width: 100%;
    max-width: min(36rem, calc(100vw - 3rem));
    max-height: 34svh;
  }
  .intro-art img {
    width: 100%;
    max-height: 34svh;
  }
  .intro-details {
    width: 100%;
    max-width: 30rem;
    height: clamp(11rem, 22svh, 13rem);
    align-self: flex-start;
  }
  .intro-specs {
    max-width: 30rem;
  }
  .bottom-action {
    position: relative;
    bottom: auto;
    left: auto;
    right: auto;
    align-self: center;
    width: fit-content;
    min-width: 18rem;
    margin-top: 0.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }

  .swipe-cue span {
    animation: none;
  }

  .page {
    transition-duration: 0.01ms !important;
  }
}