:root {
  color-scheme: dark;
  --ink: #f4efe5;
  --muted: #b7b0a2;
  --faint: #7d807a;
  --bg: #0b0f10;
  --panel: rgba(18, 22, 23, 0.86);
  --line: rgba(244, 239, 229, 0.18);
  --amber: #c98d4c;
  --red: #9d2f2f;
  --teal: #4f8f8a;
}

* {
  box-sizing: border-box;
}

[hidden] {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.55;
  background:
    linear-gradient(90deg, rgba(7, 9, 10, 0.94), rgba(7, 9, 10, 0.74)),
    url("./assets/hero-industrial-atrium-v0.1.png") center / cover fixed no-repeat,
    var(--bg);
}

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

.checkout-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(340px, 430px);
  gap: clamp(20px, 4vw, 46px);
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
  padding: 42px 0;
}

.legal-shell {
  display: block;
  max-width: 980px;
}

.order-panel,
.summary-card,
.output-card {
  border: 1px solid var(--line);
  background: var(--panel);
  backdrop-filter: blur(20px);
}

.order-panel {
  padding: clamp(22px, 4vw, 42px);
}

.legal-panel {
  max-width: 980px;
  margin: 0 auto;
}

.back-link {
  display: inline-flex;
  margin-bottom: 28px;
  color: var(--muted);
  text-decoration: none;
}

.back-link:hover {
  color: var(--ink);
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--amber);
  font-size: 13px;
  font-weight: 800;
}

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

h1 {
  margin-bottom: 16px;
  font-size: clamp(44px, 8vw, 86px);
  line-height: 0.96;
}

h2 {
  margin-bottom: 18px;
  font-size: 30px;
  line-height: 1.1;
}

.lead {
  max-width: 720px;
  color: var(--muted);
  font-size: 18px;
}

.order-form {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

fieldset {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 20px;
  margin: 0;
  border: 1px solid var(--line);
}

legend {
  grid-column: 1 / -1;
  float: none;
  width: auto;
  writing-mode: horizontal-tb;
  padding: 0 8px;
  color: var(--amber);
  font-weight: 800;
}

label {
  display: grid;
  gap: 7px;
}

label span,
.fixed-price-field > span {
  color: var(--muted);
  font-size: 13px;
}

input,
select,
textarea {
  width: 100%;
  min-height: 44px;
  padding: 10px 12px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--line);
  border-radius: 6px;
}

input:focus,
select:focus,
textarea:focus {
  outline: 2px solid rgba(201, 141, 76, 0.35);
  outline-offset: 1px;
}

select option {
  color: #17110b;
  background: #f4efe5;
}

.purchase-shell {
  display: block;
  width: min(980px, calc(100% - 40px));
}

.purchase-panel {
  padding: clamp(24px, 5vw, 52px);
}

.purchase-hero {
  max-width: 780px;
}

.purchase-hero h1 {
  margin-bottom: 8px;
}

.season-name {
  margin: 0 0 20px;
  color: var(--amber);
  font-size: clamp(25px, 4vw, 38px);
  font-weight: 800;
  line-height: 1.15;
}

.purchase-facts {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  border: 1px solid var(--line);
  background: var(--line);
}

.purchase-facts div {
  display: grid;
  gap: 6px;
  min-height: 92px;
  align-content: center;
  padding: 16px;
  background: #171c1e;
}

.purchase-facts span,
.purchase-total span {
  color: var(--faint);
  font-size: 13px;
}

.purchase-facts strong {
  font-size: 18px;
}

.purchase-section {
  padding: 36px 0;
  border-bottom: 1px solid var(--line);
}

.purchase-section h2 {
  max-width: 720px;
  margin-bottom: 22px;
}

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

.experience-mode {
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
}

.experience-mode > strong {
  color: var(--amber);
  font-size: 13px;
}

.experience-mode h3 {
  margin: 8px 0 12px;
  font-size: 21px;
}

.experience-mode p,
.experience-mode li,
.purchase-boundary p {
  color: var(--muted);
}

.experience-mode ul {
  display: grid;
  gap: 6px;
  padding-left: 20px;
  margin: 16px 0 0;
}

.memory-promise {
  display: grid;
  border-top: 1px solid var(--line);
}

.memory-promise p {
  display: grid;
  grid-template-columns: minmax(120px, 0.28fr) minmax(0, 1fr);
  gap: 18px;
  padding: 17px 0;
  margin: 0;
  border-bottom: 1px solid var(--line);
}

.memory-promise strong {
  color: var(--amber);
  font-size: 13px;
}

.memory-promise span {
  color: var(--muted);
  line-height: 1.7;
}

.purchase-memory-quote {
  padding: 16px 0 16px 20px;
  margin: 26px 0 0;
  border-left: 3px solid var(--teal);
  color: var(--ink);
  font-family: Georgia, "Songti SC", "STSong", serif;
  font-size: 20px;
  line-height: 1.6;
}

.purchase-boundary a,
.check-row a {
  color: var(--amber);
}

.purchase-form {
  margin-top: 36px;
}

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

.purchase-final {
  display: grid;
  gap: 14px;
  padding-top: 12px;
}

.purchase-total {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 20px;
  align-items: end;
  padding: 20px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.purchase-total strong {
  grid-column: 2;
  grid-row: 1 / span 2;
  color: var(--amber);
  font-size: 36px;
}

.purchase-total small {
  color: var(--muted);
}

.purchase-button {
  width: 100%;
  min-height: 54px;
  font-size: 17px;
}

.fixed-price-field {
  display: grid;
  gap: 7px;
}

.fixed-price-card {
  display: flex;
  min-height: 62px;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 14px;
  border: 1px solid rgba(201, 141, 76, 0.52);
  border-radius: 6px;
  background:
    linear-gradient(135deg, rgba(201, 141, 76, 0.12), rgba(79, 143, 138, 0.08)),
    rgba(255, 255, 255, 0.05);
}

.fixed-price-card strong {
  color: var(--amber);
  font-size: 26px;
  line-height: 1;
}

.fixed-price-card small {
  color: var(--muted);
  text-align: right;
}

.check-row {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: 20px minmax(0, 1fr);
  align-items: start;
  gap: 10px;
}

.check-row input {
  width: 18px;
  min-height: 18px;
  margin: 4px 0 0;
}

.check-row span {
  color: var(--ink);
  font-size: 14px;
}

.honeypot {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.email-verification,
.account-login-form,
.account-dossier,
.sync-sequence {
  display: grid;
  gap: 14px;
}

.email-verification {
  padding: 18px;
  border: 1px solid rgba(201, 141, 76, 0.42);
  border-radius: 6px;
  background: rgba(201, 141, 76, 0.08);
}

.email-verification p {
  margin: 0;
  color: var(--muted);
}

.account-login-form {
  max-width: 520px;
  margin-top: 24px;
}

.account-dossier {
  margin-top: 28px;
  padding: 24px;
  border: 1px solid rgba(201, 141, 76, 0.46);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.045);
}

.account-dossier p {
  margin: 0;
  overflow-wrap: anywhere;
}

.account-dossier > p > strong {
  font-size: 30px;
}

.account-seal {
  width: fit-content;
  padding: 6px 10px;
  border: 1px solid var(--amber);
  color: var(--amber);
  font-size: 13px;
  font-weight: 800;
}

.archive-progress {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.archive-progress span {
  color: var(--faint);
  font-size: 13px;
}

.account-memory {
  display: grid;
  grid-template-columns: minmax(170px, 0.38fr) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
  padding: 17px 0;
  border-bottom: 1px solid var(--line);
}

.account-memory div {
  display: grid;
  gap: 5px;
}

.account-memory span {
  color: var(--faint);
  font-size: 13px;
}

.account-memory strong {
  color: var(--amber);
}

.account-memory p {
  color: var(--muted);
  line-height: 1.7;
}

.sync-sequence {
  margin: 30px 0;
}

.sync-sequence p {
  display: grid;
  grid-template-columns: 42px minmax(120px, 0.55fr) minmax(0, 1fr);
  gap: 14px;
  align-items: center;
  padding: 15px 0;
  margin: 0;
  border-bottom: 1px solid var(--line);
}

.sync-sequence span {
  color: var(--amber);
  font-size: 13px;
  font-weight: 800;
}

.sync-sequence em {
  color: var(--muted);
  font-style: normal;
}

.start-safety {
  margin: 18px 0 0;
  color: var(--faint);
  font-size: 13px;
}

.start-safety a {
  color: var(--amber);
}

.unlock-form {
  display: grid;
  gap: 12px;
  max-width: 420px;
  margin-top: 18px;
}

.button {
  display: inline-flex;
  min-height: 46px;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
  font-weight: 800;
  cursor: pointer;
}

.button.primary {
  border-color: var(--amber);
  background: var(--amber);
  color: #17110b;
}

.button:disabled {
  cursor: progress;
  opacity: 0.7;
}

.button.full {
  width: 100%;
}

.summary-panel {
  display: grid;
  align-content: start;
  gap: 18px;
}

.summary-card,
.output-card {
  padding: 24px;
}

.facts {
  display: grid;
  gap: 10px;
  margin: 0 0 22px;
}

.facts div {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.facts dt {
  color: var(--faint);
}

.facts dd {
  margin: 0;
  text-align: right;
}

.payment-box {
  display: grid;
  min-height: 128px;
  place-items: center;
  padding: 18px;
  border: 1px dashed rgba(201, 141, 76, 0.58);
  background:
    linear-gradient(135deg, rgba(201, 141, 76, 0.08), rgba(79, 143, 138, 0.08)),
    rgba(255, 255, 255, 0.03);
  text-align: center;
}

.payment-box span {
  color: var(--muted);
  font-size: 14px;
}

.payment-box strong {
  color: var(--amber);
  font-size: 24px;
}

.note,
.copy-status {
  margin: 14px 0 0;
  color: var(--faint);
  font-size: 13px;
}

.mini-steps {
  display: grid;
  gap: 10px;
  padding-left: 22px;
  margin: 0;
  color: var(--muted);
}

.mini-steps li::marker {
  color: var(--amber);
  font-weight: 800;
}

.legal-content {
  display: grid;
  gap: 18px;
  margin: 32px 0;
}

.legal-content h2 {
  margin: 18px 0 0;
  font-size: 26px;
}

.legal-content p,
.legal-content li {
  color: var(--muted);
}

.legal-content ul {
  display: grid;
  gap: 8px;
  padding-left: 22px;
  margin: 0;
}

.legal-content li::marker {
  color: var(--amber);
}

.legal-content pre {
  overflow: auto;
  padding: 16px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
  white-space: pre-wrap;
}

.order-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 14px;
  margin: 24px 0 0;
}

.order-summary div {
  display: grid;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.05);
}

.order-summary span {
  color: var(--faint);
  font-size: 13px;
}

.order-summary strong {
  overflow-wrap: anywhere;
}

.qr-payment-panel {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 20px;
  align-items: center;
  padding: 20px;
  border: 1px solid rgba(201, 141, 76, 0.46);
  border-radius: 8px;
  background:
    linear-gradient(135deg, rgba(201, 141, 76, 0.1), rgba(79, 143, 138, 0.08)),
    rgba(255, 255, 255, 0.045);
}

.qr-box {
  display: grid;
  width: 180px;
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 6px;
  background:
    linear-gradient(90deg, rgba(244, 239, 229, 0.1) 10px, transparent 10px) 0 0 / 28px 28px,
    linear-gradient(rgba(244, 239, 229, 0.1) 10px, transparent 10px) 0 0 / 28px 28px,
    rgba(255, 255, 255, 0.06);
  color: var(--muted);
  text-align: center;
  font-weight: 800;
}

.qr-box img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 6px;
}

.qr-box .qr-loading {
  padding: 0 10px;
  font-size: 12.5px;
  color: var(--muted);
  text-align: center;
}

blockquote {
  white-space: pre-line;
  margin: 0;
  padding: 16px 18px;
  border-left: 3px solid var(--amber);
  background: rgba(255, 255, 255, 0.06);
  color: var(--ink);
  font-weight: 800;
}

.session-form {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
}

.siheng-chat {
  display: grid;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
}

/* 会话台顶栏状态条：当前幕 / 核心问题 / 可盘问。常驻，让人随时知道在哪、该干嘛。 */
.siheng-statusbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.5;
}

.siheng-statusbar__act {
  flex: none;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(201, 141, 76, 0.16);
  border: 1px solid rgba(201, 141, 76, 0.4);
  color: var(--amber);
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.siheng-statusbar__item:empty {
  display: none;
}

.siheng-statusbar__item b {
  color: var(--ink);
  font-weight: 600;
}

/* 输入框旁的快捷药丸：第一步一点就走，新手不卡在“不知道发什么”。 */
.siheng-quickbar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.siheng-quickbar:empty {
  display: none;
}

.siheng-quickbar button {
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.04);
  color: var(--muted);
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease, background 0.15s ease;
}

.siheng-quickbar button:hover {
  border-color: rgba(201, 141, 76, 0.55);
  color: var(--ink);
  background: rgba(201, 141, 76, 0.1);
}

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

.siheng-memory-strip {
  display: grid;
  grid-template-columns: minmax(240px, 0.65fr) minmax(0, 1fr);
  gap: 28px;
  align-items: end;
  padding: 20px 0 24px;
  border-top: 1px solid rgba(79, 143, 138, 0.35);
  border-bottom: 1px solid rgba(79, 143, 138, 0.35);
}

.siheng-memory-strip h2,
.siheng-memory-strip p {
  margin: 0;
}

.siheng-memory-strip > p {
  color: var(--muted);
  line-height: 1.75;
}

.siheng-capability {
  display: grid;
  gap: 8px;
  min-height: 116px;
  padding: 14px;
  border: 1px solid rgba(244, 239, 229, 0.14);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
}

.siheng-capability strong {
  color: var(--amber);
  font-size: 13px;
  letter-spacing: 0;
}

.siheng-capability p {
  margin: 0;
  color: var(--muted);
}

.siheng-chat__messages {
  display: grid;
  gap: 12px;
  max-height: 480px;
  overflow: auto;
  padding: 4px;
}

.siheng-message {
  display: grid;
  gap: 6px;
  max-width: min(100%, 720px);
  padding: 12px 14px;
  border: 1px solid rgba(244, 239, 229, 0.14);
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.18);
}

.siheng-message[data-role="user"] {
  justify-self: end;
  border-color: rgba(79, 143, 138, 0.42);
  background: rgba(79, 143, 138, 0.12);
}

.siheng-message[data-role="assistant"] {
  justify-self: start;
  border-color: rgba(201, 141, 76, 0.4);
  background: rgba(201, 141, 76, 0.1);
}

.siheng-message strong {
  color: var(--amber);
  font-size: 13px;
}

.siheng-message p {
  margin: 0;
  color: var(--ink);
  white-space: pre-line;
}

.siheng-message[data-streaming="true"] p::after {
  content: "";
  display: inline-block;
  width: 2px;
  height: 1em;
  margin-left: 4px;
  vertical-align: -0.12em;
  background: var(--amber);
  animation: siheng-cursor 0.8s steps(1) infinite;
}

@keyframes siheng-cursor {
  50% {
    opacity: 0;
  }
}

.siheng-message time {
  color: var(--faint);
  font-size: 12px;
}

.siheng-quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.siheng-quick-actions button {
  min-height: 38px;
  padding: 0 12px;
  border: 1px solid rgba(244, 239, 229, 0.18);
  border-radius: 6px;
  color: var(--muted);
  background: rgba(255, 255, 255, 0.05);
  cursor: pointer;
}

.siheng-quick-actions button:hover {
  border-color: rgba(201, 141, 76, 0.52);
  color: var(--ink);
}

.siheng-advance {
  display: grid;
  gap: 10px;
  margin: 6px 0 2px;
  padding: 14px 16px;
  border: 1px solid rgba(200, 160, 90, 0.45);
  border-radius: 12px;
  background: rgba(120, 90, 40, 0.16);
}

.siheng-advance__hint {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.6;
  color: #e8dcc4;
}

.siheng-advance__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.siheng-chat__form {
  display: grid;
  gap: 12px;
}

.siheng-chat__form textarea {
  min-height: 110px;
}

.case-library {
  display: grid;
  grid-template-columns: minmax(190px, 260px) minmax(0, 1fr);
  gap: 18px;
  align-items: start;
}

.case-library__nav,
.case-library__reader {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.045);
}

.case-library__nav {
  position: sticky;
  top: 18px;
  display: grid;
  gap: 8px;
  max-height: calc(100vh - 36px);
  overflow: auto;
  padding: 16px;
}

.case-nav-button {
  width: 100%;
  min-height: 40px;
  padding: 9px 10px;
  border: 1px solid transparent;
  border-radius: 6px;
  color: var(--muted);
  background: transparent;
  text-align: left;
  cursor: pointer;
}

.case-nav-button:hover,
.case-nav-button[data-active="true"] {
  border-color: rgba(201, 141, 76, 0.54);
  color: var(--ink);
  background: rgba(201, 141, 76, 0.12);
}

.case-library__reader {
  min-width: 0;
  padding: clamp(16px, 3vw, 28px);
}

.case-stage {
  display: grid;
  gap: 18px;
}

.case-stage__header {
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 18px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.case-stage__header h2,
.case-stage__header p {
  margin: 0;
}

.case-stage__header p {
  color: var(--faint);
  font-size: 13px;
}

.case-handoff {
  padding: 14px 16px;
  border: 1px solid rgba(201, 141, 76, 0.34);
  border-radius: 6px;
  background: rgba(201, 141, 76, 0.08);
}

.case-handoff p {
  margin: 0;
  color: var(--muted);
}

.case-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.case-document {
  display: grid;
  gap: 14px;
}

.case-document h2,
.case-document h3,
.case-document h4,
.case-document p {
  margin: 0;
}

.case-document h2 {
  font-size: clamp(30px, 5vw, 52px);
}

.case-document h3 {
  margin-top: 12px;
  font-size: 24px;
}

.case-document h4 {
  margin-top: 8px;
  color: var(--amber);
  font-size: 18px;
}

.case-document p,
.case-document li,
.case-document td {
  color: var(--muted);
}

.case-document ul {
  display: grid;
  gap: 8px;
  padding-left: 22px;
  margin: 0;
}

.case-document table {
  display: block;
  width: 100%;
  overflow-x: auto;
  border-collapse: collapse;
}

.case-document th,
.case-document td {
  padding: 10px;
  border: 1px solid var(--line);
  vertical-align: top;
}

.case-document th {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.06);
  text-align: left;
}

.case-document code {
  padding: 1px 5px;
  border-radius: 4px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.09);
}

.board-form {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.04);
}

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

.board-form textarea {
  min-height: 120px;
}

.board-layout {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.board-lane {
  min-width: 0;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.045);
}

.board-lane h3,
.board-lane p {
  margin: 0;
}

.board-lane h3 {
  color: var(--amber);
  font-size: 20px;
}

.board-lane > p,
.board-empty {
  color: var(--faint);
  font-size: 13px;
}

.board-empty {
  margin-top: 12px;
}

.board-card {
  display: grid;
  gap: 8px;
  padding: 12px;
  margin-top: 12px;
  border: 1px solid rgba(244, 239, 229, 0.14);
  border-radius: 6px;
  background: rgba(0, 0, 0, 0.16);
}

.board-card strong {
  overflow-wrap: anywhere;
}

.board-card span {
  color: var(--faint);
  font-size: 13px;
}

.board-card p {
  color: var(--muted);
}

.board-delete {
  width: fit-content;
  min-height: 34px;
  padding: 0 10px;
  border: 1px solid rgba(157, 47, 47, 0.48);
  border-radius: 6px;
  color: var(--ink);
  background: rgba(157, 47, 47, 0.16);
  cursor: pointer;
}

.payment-fallback {
  margin-top: 18px;
  color: var(--muted);
}

.payment-fallback summary {
  cursor: pointer;
  color: var(--muted);
  font-weight: 800;
}

.payment-fallback p {
  margin: 10px 0;
  color: var(--faint);
  font-size: 13px;
}

.payment-fallback a {
  color: var(--amber);
  font-weight: 800;
}

textarea {
  min-height: 260px;
  margin-bottom: 12px;
  resize: vertical;
}

@media (max-width: 900px) {
  .checkout-shell {
    grid-template-columns: 1fr;
  }

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

@media (max-width: 620px) {
  .checkout-shell {
    width: min(100% - 28px, 1180px);
    padding: 22px 0;
  }

  fieldset {
    grid-template-columns: 1fr;
    padding: 16px;
  }

  .purchase-panel {
    padding: 22px 18px;
  }

  .purchase-facts,
  .experience-mode-grid {
    grid-template-columns: 1fr;
  }

  .purchase-facts div {
    min-height: 74px;
  }

  .full-field {
    grid-column: auto;
  }

  h1 {
    font-size: 42px;
  }

  .button {
    width: 100%;
  }

  .qr-payment-panel {
    grid-template-columns: 1fr;
  }

  .session-form {
    grid-template-columns: 1fr;
  }

  .siheng-capability-grid {
    grid-template-columns: 1fr;
  }

  .siheng-memory-strip {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .case-library {
    grid-template-columns: 1fr;
  }

  .board-form,
  .board-layout {
    grid-template-columns: 1fr;
  }

  .case-library__nav {
    position: static;
    max-height: none;
  }

  .order-summary {
    grid-template-columns: 1fr;
  }

  .qr-box {
    width: min(100%, 240px);
  }

  .sync-sequence p {
    grid-template-columns: 32px minmax(0, 1fr);
  }

  .sync-sequence em {
    grid-column: 2;
  }

  .memory-promise p {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .account-memory {
    grid-template-columns: 1fr;
    gap: 8px;
  }
}

/* 排版纪律：标签不拆字、正文不留孤字行 */
dt, th { word-break: keep-all; }
p, li, dd { text-wrap: pretty; }

/* ===== 移动端补丁 ===== */
@media (max-width: 620px) {
  /* iOS：输入框字号小于 16px 会触发自动放大缩放，造成页面跳动 */
  input, textarea, select {
    font-size: 16px;
  }
}