.page-disclaimer {
  display: block;
  background: var(--bg);
  color: var(--text);
}

.page-disclaimer .breadcrumb {
  padding: 20px 0 2px;
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 44px;
  background:
    radial-gradient(120% 100% at 86% 4%, rgba(255, 106, 43, 0.16), transparent 58%),
    radial-gradient(90% 90% at 4% 96%, rgba(47, 210, 197, 0.12), transparent 60%),
    linear-gradient(180deg, var(--c-deep) 0%, var(--c-ink) 100%);
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .usage-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(168, 182, 198, 0.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(168, 182, 198, 0.055) 1px, transparent 1px);
  background-size: 52px 52px;
  -webkit-mask-image: radial-gradient(120% 100% at 50% 0%, #000 18%, transparent 78%);
  mask-image: radial-gradient(120% 100% at 50% 0%, #000 18%, transparent 78%);
  pointer-events: none;
}

.page-disclaimer .usage-hero-inner {
  position: relative;
  display: grid;
  gap: 30px;
  align-items: end;
}

.page-disclaimer .usage-hero h1 {
  margin: 14px 0 16px;
  font-size: clamp(1.9rem, 7vw, 3.5rem);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -0.025em;
  color: var(--c-white);
}

.page-disclaimer .usage-hero .lead {
  max-width: 48ch;
  margin: 0;
  font-size: clamp(1rem, 2.6vw, 1.12rem);
  line-height: 1.78;
  color: var(--text-dim);
}

.page-disclaimer .usage-formula {
  border: 1px solid var(--line-strong);
  border-radius: var(--r-xl);
  background: linear-gradient(155deg, rgba(18, 38, 63, 0.92), rgba(5, 13, 24, 0.92));
  padding: 20px 22px;
}

.page-disclaimer .formula-caption {
  margin: 0 0 14px;
  font-size: 0.74rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-silver);
}

.page-disclaimer .formula-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
}

.page-disclaimer .formula-chip {
  padding: 8px 14px;
  border-radius: var(--r-pill);
  background: rgba(255, 106, 43, 0.12);
  border: 1px solid rgba(255, 106, 43, 0.42);
  color: var(--c-amber);
  font-size: 0.9rem;
  font-weight: 600;
  white-space: nowrap;
}

.page-disclaimer .formula-plus {
  color: var(--c-silver);
  font-family: var(--font-num);
  font-weight: 700;
}

/* ---------- 章节跳转 ---------- */
.page-disclaimer .usage-toc {
  background: rgba(18, 38, 63, 0.55);
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .toc-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 14px 0;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.page-disclaimer .toc-list::-webkit-scrollbar {
  display: none;
}

.page-disclaimer .toc-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--r-pill);
  border: 1px solid var(--line);
  background: rgba(5, 13, 24, 0.5);
  color: var(--text-dim);
  font-size: 0.86rem;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-disclaimer .toc-list a:hover,
.page-disclaimer .toc-list a:focus-visible {
  color: var(--c-white);
  border-color: rgba(255, 106, 43, 0.55);
  background: rgba(255, 106, 43, 0.1);
}

.page-disclaimer .toc-num {
  font-family: var(--font-num);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--c-signal);
}

/* ---------- 条款区 ---------- */
.page-disclaimer .usage-clause {
  padding: 0;
}

.page-disclaimer .clause-grid {
  display: grid;
  gap: 14px;
  padding: 34px 0;
  border-bottom: 1px dashed var(--line);
}

.page-disclaimer .usage-clause:last-of-type .clause-grid {
  border-bottom: 0;
  padding-bottom: 18px;
}

.page-disclaimer .clause-num {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-num);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  color: var(--c-signal);
}

.page-disclaimer .clause-num::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-signal);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.16);
}

.page-disclaimer .clause-main h2 {
  margin: 0 0 14px;
  font-size: clamp(1.2rem, 3.6vw, 1.55rem);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.015em;
  color: var(--c-white);
}

.page-disclaimer .clause-main .prose {
  margin: 0 0 14px;
  max-width: 42em;
}

.page-disclaimer .clause-main .prose:last-child {
  margin-bottom: 0;
}

.page-disclaimer .clause-main a {
  color: var(--c-cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-disclaimer .clause-main a:hover,
.page-disclaimer .clause-main a:focus-visible {
  color: var(--c-amber);
}

/* 引用格式示意 */
.page-disclaimer .usage-figure {
  margin: 22px 0;
}

.page-disclaimer .usage-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--r-lg);
  border: 1px solid var(--line);
  object-fit: cover;
  background: var(--c-navy);
}

.page-disclaimer .usage-figure figcaption {
  margin-top: 10px;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--text-faint);
}

.page-disclaimer .ref-samples {
  display: grid;
  gap: 14px;
  margin-top: 18px;
}

.page-disclaimer .ref-sample {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--c-signal);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(18, 38, 63, 0.85), rgba(5, 13, 24, 0.7));
}

.page-disclaimer .ref-sample h3 {
  margin: 0 0 10px;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--c-silver);
}

.page-disclaimer .ref-code {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--c-amber);
  word-break: break-word;
}

.page-disclaimer .ref-note {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--text-faint);
}

/* 四档周期 */
.page-disclaimer .tier-strip {
  list-style: none;
  margin: 18px 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-disclaimer .tier-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
  padding: 12px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: rgba(18, 38, 63, 0.6);
}

.page-disclaimer .tier-name {
  flex: 0 0 68px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--c-white);
}

.page-disclaimer .tier-bar {
  flex: 1 1 90px;
  min-width: 60px;
  height: 4px;
  border-radius: var(--r-pill);
  background: rgba(168, 182, 198, 0.18);
  overflow: hidden;
}

.page-disclaimer .tier-fill {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--c-signal), var(--c-amber));
}

.page-disclaimer .tier-1 .tier-fill { width: 16%; }
.page-disclaimer .tier-2 .tier-fill { width: 36%; }
.page-disclaimer .tier-3 .tier-fill { width: 64%; }
.page-disclaimer .tier-4 .tier-fill { width: 92%; }

.page-disclaimer .tier-days {
  flex: 0 0 auto;
  font-family: var(--font-num);
  font-size: 0.86rem;
  color: var(--c-amber);
}

/* 折叠条款 */
.page-disclaimer .clause-more {
  margin-top: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(5, 13, 24, 0.5);
  overflow: hidden;
}

.page-disclaimer .clause-more summary {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 16px;
  cursor: pointer;
  list-style: none;
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--c-cyan);
}

.page-disclaimer .clause-more summary::-webkit-details-marker {
  display: none;
}

.page-disclaimer .clause-more summary::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-right: 2px solid var(--c-cyan);
  border-bottom: 2px solid var(--c-cyan);
  transform: rotate(-45deg);
  transition: transform var(--dur) var(--ease);
}

.page-disclaimer .clause-more[open] summary::before {
  transform: rotate(45deg);
}

.page-disclaimer .clause-more p {
  margin: 0;
  padding: 0 16px 16px;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 收束 ---------- */
.page-disclaimer .usage-cta {
  padding: 20px 0 56px;
}

.page-disclaimer .usage-capsule {
  display: grid;
  gap: 20px;
  padding: 26px 24px;
  border-radius: var(--r-xl);
  border: 1px solid rgba(255, 106, 43, 0.34);
  background:
    radial-gradient(110% 130% at 100% 0%, rgba(255, 106, 43, 0.18), transparent 55%),
    linear-gradient(160deg, rgba(18, 38, 63, 0.95), rgba(5, 13, 24, 0.95));
}

.page-disclaimer .usage-capsule h2 {
  margin: 0 0 8px;
  font-size: clamp(1.15rem, 3.4vw, 1.45rem);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--c-white);
}

.page-disclaimer .usage-capsule p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-dim);
}

.page-disclaimer .capsule-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-disclaimer .usage-backtop {
  margin-top: 24px;
  text-align: center;
}

.page-disclaimer .usage-backtop a {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-num);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--text-faint);
  text-decoration: none;
  padding-bottom: 2px;
  border-bottom: 1px dashed var(--line-strong);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-disclaimer .usage-backtop a:hover,
.page-disclaimer .usage-backtop a:focus-visible {
  color: var(--c-signal);
  border-color: var(--c-signal);
}

/* ---------- 断点 ---------- */
@media (max-width: 520px) {
  .page-disclaimer .formula-row {
    flex-direction: column;
    align-items: stretch;
  }

  .page-disclaimer .formula-plus {
    display: none;
  }

  .page-disclaimer .formula-chip {
    text-align: center;
  }
}

@media (min-width: 700px) {
  .page-disclaimer .ref-samples {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-disclaimer .clause-grid {
    grid-template-columns: 84px minmax(0, 1fr);
    column-gap: 28px;
    align-items: start;
  }

  .page-disclaimer .clause-num {
    font-size: 1.35rem;
    padding-top: 6px;
  }

  .page-disclaimer .usage-clause .clause-main {
    min-width: 0;
  }
}

@media (min-width: 900px) {
  .page-disclaimer .usage-hero {
    padding: 40px 0 56px;
  }

  .page-disclaimer .usage-hero-inner {
    grid-template-columns: minmax(0, 1fr) 320px;
    column-gap: 44px;
  }
}

@media (min-width: 820px) {
  .page-disclaimer .usage-capsule {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 30px 34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .toc-list a,
  .page-disclaimer .clause-more summary::before,
  .page-disclaimer .usage-backtop a {
    transition: none;
  }
}