/* ================= 使用指引 /usage/ ================= */

.page-disclaimer {
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(212, 175, 55, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.05) 1px, transparent 1px);
  background-size: 80px 80px;
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-disclaimer .usage-top {
  padding-top: clamp(18px, 4vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-disclaimer .usage-hero {
  padding: clamp(20px, 4vw, 40px) 0 clamp(32px, 5vw, 56px);
}

.page-disclaimer .usage-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: center;
}

.page-disclaimer .usage-hero-copy h1 {
  margin: 10px 0 18px;
  font-size: clamp(30px, 6vw, var(--fs-page));
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-disclaimer .usage-hero-copy .lede {
  margin: 0 0 26px;
  max-width: 58ch;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--muted);
}

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

.page-disclaimer .usage-hero-note {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--gold);
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-disclaimer .usage-hero-media {
  margin: 0;
  border: 2px solid var(--line);
  background: var(--ink-deep);
  box-shadow: 10px 10px 0 rgba(6, 18, 31, 0.9);
}

.page-disclaimer .usage-hero-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-disclaimer .usage-hero-media .media-caption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  background: var(--ink-deep);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 规则刻度条 ---------- */
.page-disclaimer .usage-scale {
  padding: clamp(32px, 5vw, 56px) 0 clamp(32px, 5vw, 60px);
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-scale .section-title {
  margin: 0 0 28px;
}

.page-disclaimer .rule-scale {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: rgba(212, 175, 55, 0.38);
  border: 1px solid rgba(212, 175, 55, 0.38);
}

.page-disclaimer .rule-cell {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 132px;
  padding: 22px 18px 24px;
  background: rgba(11, 30, 51, 0.94);
}

.page-disclaimer .rule-no {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-disclaimer .rule-text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 页内目录 ---------- */
.page-disclaimer .usage-toc {
  background: rgba(6, 18, 31, 0.94);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-disclaimer .usage-toc-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 18px;
  padding-top: 12px;
  padding-bottom: 12px;
}

.page-disclaimer .usage-toc-label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
  white-space: nowrap;
}

.page-disclaimer .usage-toc-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  min-width: 0;
}

.page-disclaimer .usage-toc-list a {
  display: inline-block;
  padding: 6px 12px;
  border: 1px solid var(--line);
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-disclaimer .usage-toc-list a:hover,
.page-disclaimer .usage-toc-list a:focus-visible {
  color: var(--gold-lit);
  border-color: var(--gold);
}

/* ---------- 通用区块 ---------- */
.page-disclaimer .usage-section {
  padding: clamp(40px, 7vw, 76px) 0;
  border-top: 1px solid var(--line);
}

.page-disclaimer .usage-section .section-title {
  margin: 8px 0 0;
  font-size: clamp(22px, 3.4vw, var(--fs-section));
  font-weight: 900;
  line-height: 1.3;
  color: var(--paper);
}

.page-disclaimer .usage-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 36px;
  margin-bottom: 30px;
}

.page-disclaimer .usage-head .section-note {
  margin: 0;
  max-width: 42ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-disclaimer .usage-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
  margin-top: 28px;
}

.page-disclaimer .prose {
  max-width: 68ch;
}

.page-disclaimer .prose p {
  margin: 0 0 20px;
  font-size: var(--fs-body);
  line-height: 1.85;
  color: var(--paper);
}

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

/* ---------- 数据说明 ---------- */
.page-disclaimer .usage-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 32px;
  border: 1px solid var(--line);
  background: var(--line);
}

.page-disclaimer .usage-stat {
  padding: 20px 18px;
  background: var(--panel);
}

.page-disclaimer .usage-stat .mono-num {
  display: block;
  line-height: 1.1;
}

.page-disclaimer .usage-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

.page-disclaimer .usage-note-card {
  padding: 22px 20px 24px;
}

.page-disclaimer .usage-dl {
  margin: 0;
}

.page-disclaimer .usage-dl dt {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-disclaimer .usage-dl dt:first-child {
  margin-top: 0;
}

.page-disclaimer .usage-dl dd {
  margin: 5px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--paper);
}

/* ---------- 入口选择 ---------- */
.page-disclaimer .usage-entry-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 22px);
}

.page-disclaimer .usage-entry-card {
  display: flex;
  flex-direction: column;
  padding: 24px 22px 26px;
}

.page-disclaimer .usage-entry-key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-disclaimer .usage-entry-card h3 {
  margin: 12px 0 12px;
  font-size: var(--fs-card);
  font-weight: 700;
  line-height: 1.35;
  color: var(--paper);
}

.page-disclaimer .usage-entry-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-disclaimer .usage-entry-card .usage-entry-fit {
  margin-top: 14px;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  color: var(--paper);
}

.page-disclaimer .usage-entry-tail {
  margin: 26px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-disclaimer .usage-entry-tail a,
.page-disclaimer .usage-feedback-foot a {
  color: var(--gold-lit);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 设备建议 ---------- */
.page-disclaimer .usage-devices {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 2.4vw, 22px);
}

.page-disclaimer .usage-device {
  padding: 24px 22px 26px;
}

.page-disclaimer .usage-device-index {
  display: inline-block;
  margin-bottom: 16px;
  padding: 3px 9px;
  border: 1px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-disclaimer .usage-device h3 {
  margin: 0 0 14px;
  font-size: var(--fs-card);
  font-weight: 700;
  color: var(--paper);
}

.page-disclaimer .usage-device ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-disclaimer .usage-device li {
  position: relative;
  margin-bottom: 11px;
  padding-left: 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-disclaimer .usage-device li:last-child {
  margin-bottom: 0;
}

.page-disclaimer .usage-device li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 1px;
  background: var(--gold);
}

/* ---------- 反馈流程 ---------- */
.page-disclaimer .usage-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-disclaimer .usage-step {
  padding: 26px 22px 26px;
  border: 2px solid var(--line);
  background: var(--panel);
  box-shadow: 7px 7px 0 rgba(6, 18, 31, 0.9);
}

.page-disclaimer .usage-step--lime {
  border-color: var(--lime);
  box-shadow: 7px 7px 0 rgba(183, 243, 74, 0.16);
}

.page-disclaimer .usage-step--lime .rule-no {
  color: var(--lime);
}

.page-disclaimer .usage-step h3 {
  margin: 14px 0 10px;
  font-size: var(--fs-card);
  font-weight: 700;
  color: var(--paper);
}

.page-disclaimer .usage-step p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-disclaimer .usage-feedback-foot {
  margin-top: 30px;
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  background: rgba(18, 42, 68, 0.55);
}

.page-disclaimer .usage-feedback-foot p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

.page-disclaimer .usage-feedback-foot p + p {
  margin-top: 12px;
}

/* ---------- 引用与转载 ---------- */
.page-disclaimer .usage-cite-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 38px);
  align-items: start;
  margin-top: 28px;
}

.page-disclaimer .usage-cite-card {
  padding: 24px 22px 26px;
  border-left: 3px solid var(--lime);
}

.page-disclaimer .usage-cite-card .card-meta {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-disclaimer .usage-cite-sample {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--line);
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper);
}

/* ---------- 版本与更新 ---------- */
.page-disclaimer .usage-version {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: center;
  margin-top: 28px;
  padding: clamp(24px, 4vw, 36px);
  border: 2px solid var(--gold);
  background: rgba(18, 42, 68, 0.72);
  box-shadow: 8px 8px 0 rgba(6, 18, 31, 0.9);
}

.page-disclaimer .usage-version .btn {
  justify-self: start;
}

/* ================= 响应式 ================= */

@media (min-width: 620px) {
  .page-disclaimer .rule-scale {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-disclaimer .usage-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-disclaimer .usage-entry-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-disclaimer .usage-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }
}

@media (min-width: 760px) {
  .page-disclaimer .usage-devices {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-disclaimer .usage-cite-grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  }

  .page-disclaimer .usage-version {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 40px;
  }
}

@media (min-width: 920px) {
  .page-disclaimer .usage-hero-grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
  }
}

@media (min-width: 1000px) {
  .page-disclaimer .rule-scale {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .page-disclaimer .usage-split {
    grid-template-columns: minmax(0, 2fr) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 56px);
  }

  .page-disclaimer .usage-toc {
    position: sticky;
    top: var(--header-h);
    z-index: 6;
    backdrop-filter: blur(8px);
  }

  .page-disclaimer .usage-toc-inner {
    flex-wrap: nowrap;
  }

  .page-disclaimer .usage-toc-list {
    flex-wrap: nowrap;
    overflow-x: auto;
    scrollbar-width: none;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .usage-toc-list a {
    transition: none;
  }
}