/* ===== 使用说明页 · page-disclaimer ===== */

.page-disclaimer {
  --u-gap: clamp(52px, 7vw, 96px);
  --u-rail: 132px;
  background: var(--ink-900);
  color: var(--text-on-dark);
  overflow-x: clip;
}

.page-disclaimer [id^="sec-"] {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

/* ---------- 顶部叙事区 ---------- */

.page-disclaimer .usage-hero {
  position: relative;
  padding: calc(var(--header-h) + 34px) 0 clamp(44px, 6vw, 78px);
  background:
    radial-gradient(118% 92% at 88% -10%, rgba(255, 106, 31, .18) 0%, rgba(255, 106, 31, 0) 60%),
    linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 68%, var(--ink-900) 100%);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-disclaimer .usage-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(30, 74, 110, .34) 1px, transparent 1px),
    linear-gradient(180deg, rgba(30, 74, 110, .2) 1px, transparent 1px);
  background-size: 92px 92px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .5), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .5), transparent 76%);
  pointer-events: none;
}

.page-disclaimer .usage-hero > .shell {
  position: relative;
  z-index: 2;
}

.page-disclaimer .usage-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: .02em;
}

.page-disclaimer .usage-crumbs a {
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-disclaimer .usage-crumbs a:hover,
.page-disclaimer .usage-crumbs a:focus-visible {
  color: var(--flame-300);
}

.page-disclaimer .usage-crumbs__sep {
  color: var(--line);
}

.page-disclaimer .usage-crumbs [aria-current="page"] {
  color: var(--flame-500);
}

.page-disclaimer .usage-hero__body {
  max-width: 940px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-disclaimer .usage-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(32px, 5.4vw, 66px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: -.02em;
  color: var(--text-on-dark);
}

.page-disclaimer .usage-lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
  color: var(--text-dim);
}

.page-disclaimer .usage-hero__figure {
  margin: clamp(30px, 5vw, 54px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--ink-700);
}

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

/* ---------- 三条结论 ---------- */

.page-disclaimer .usage-brief {
  padding: var(--u-gap) 0;
  background: var(--mist);
  color: var(--ink-text);
  border-bottom: 1px solid var(--mist-line);
}

.page-disclaimer .usage-brief__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(22px, 3vw, 34px);
}

.page-disclaimer .usage-brief__head h2 {
  margin: 0;
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--ink-text);
}

.page-disclaimer .usage-brief__hint {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--graphite);
}

.page-disclaimer .usage-brief__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-disclaimer .brief-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  height: 100%;
  padding: 26px 22px 22px;
  border: 1px solid var(--mist-line);
  border-radius: var(--radius-lg);
  background: #fff;
  color: inherit;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.page-disclaimer .brief-card:hover,
.page-disclaimer .brief-card:focus-visible {
  border-color: var(--flame-500);
  transform: translateY(-3px);
  box-shadow: 0 14px 32px rgba(10, 26, 42, .1);
  outline: none;
}

.page-disclaimer .brief-card__num {
  font-size: 30px;
  font-weight: 300;
  line-height: 1;
  color: rgba(10, 26, 42, .18);
  letter-spacing: .02em;
}

.page-disclaimer .brief-card .label {
  align-self: flex-start;
}

.page-disclaimer .brief-card__title {
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink-text);
}

.page-disclaimer .brief-card__text {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(22, 32, 43, .78);
}

.page-disclaimer .brief-card__more {
  margin-top: auto;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--graphite);
  transition: color var(--dur) var(--ease);
}

.page-disclaimer .brief-card:hover .brief-card__more,
.page-disclaimer .brief-card:focus-visible .brief-card__more {
  color: var(--flame-500);
}

/* ---------- 通用小节骨架 ---------- */

.page-disclaimer .usage-sec {
  padding: var(--u-gap) 0;
  border-bottom: 1px solid var(--line-faint);
}

.page-disclaimer .usage-sec--deep {
  background: var(--ink-900);
}

.page-disclaimer .usage-sec--panel {
  background: var(--ink-800);
  border-bottom-color: var(--line-soft);
}

.page-disclaimer .usage-sec--light {
  background: var(--mist);
  color: var(--ink-text);
  border-bottom-color: var(--mist-line);
}

.page-disclaimer .usage-sec__grid {
  display: grid;
  gap: 14px;
}

.page-disclaimer .usage-sec__num {
  display: block;
  font-size: clamp(44px, 11vw, 64px);
  font-weight: 200;
  line-height: 1;
  letter-spacing: .02em;
  color: rgba(234, 241, 248, .11);
}

.page-disclaimer .usage-sec--light .usage-sec__num {
  color: rgba(10, 26, 42, .11);
}

.page-disclaimer .usage-sec__body h2 {
  margin: 12px 0 0;
  font-size: clamp(24px, 3.4vw, 40px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.02em;
  color: var(--text-on-dark);
}

.page-disclaimer .usage-sec--light .usage-sec__body h2 {
  color: var(--ink-text);
}

.page-disclaimer .usage-sec__body p {
  margin: 18px 0 0;
  max-width: 70ch;
  font-size: 16px;
  line-height: 1.88;
  color: var(--text-dim);
}

.page-disclaimer .usage-sec--light .usage-sec__body p {
  color: rgba(22, 32, 43, .82);
}

.page-disclaimer .usage-tail {
  font-size: 15px !important;
}

/* ---------- 数据事实行 ---------- */

.page-disclaimer .usage-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 28px;
}

.page-disclaimer .usage-fact {
  padding: 18px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ink-700);
}

.page-disclaimer .usage-fact__value {
  display: block;
  font-size: clamp(19px, 2.6vw, 26px);
  color: var(--jade-500);
  letter-spacing: .02em;
}

.page-disclaimer .usage-fact__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
}

/* ---------- 提示条 ---------- */

.page-disclaimer .usage-note {
  margin-top: 26px;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-left: 3px solid var(--flame-500);
  border-radius: var(--radius-md);
  background: rgba(255, 106, 31, .07);
}

.page-disclaimer .usage-note p {
  margin: 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-on-dark);
}

.page-disclaimer .usage-sec--light .usage-note {
  border-color: var(--mist-line);
  border-left-color: var(--flame-500);
  background: #fff;
}

.page-disclaimer .usage-sec--light .usage-note p {
  color: rgba(22, 32, 43, .84);
}

/* ---------- 列表 ---------- */

.page-disclaimer .usage-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  max-width: 76ch;
}

.page-disclaimer .usage-list--tight {
  margin-top: 16px;
  gap: 12px;
}

.page-disclaimer .usage-list li {
  position: relative;
  padding-left: 24px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

.page-disclaimer .usage-sec--light .usage-list li {
  color: rgba(22, 32, 43, .82);
}

.page-disclaimer .usage-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--jade-500);
}

.page-disclaimer .usage-list strong {
  color: var(--text-on-dark);
  font-weight: 700;
}

.page-disclaimer .usage-sec--light .usage-list strong {
  color: var(--ink-text);
}

/* ---------- 两栏对照 ---------- */

.page-disclaimer .usage-pair {
  display: grid;
  gap: 16px;
  margin-top: 28px;
}

.page-disclaimer .usage-pair__col {
  padding: 24px 22px;
  border: 1px solid var(--mist-line);
  border-radius: var(--radius-lg);
  background: #fff;
}

.page-disclaimer .usage-pair__col--media {
  border-color: rgba(255, 106, 31, .5);
  background: linear-gradient(180deg, #fff 0%, rgba(255, 106, 31, .07) 100%);
}

.page-disclaimer .usage-pair__head {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.page-disclaimer .usage-pair__head .label {
  align-self: flex-start;
}

.page-disclaimer .usage-pair__head h3 {
  margin: 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink-text);
}

/* ---------- 入口卡片 ---------- */

.page-disclaimer .usage-contact {
  display: grid;
  gap: 16px;
  margin-top: 30px;
}

.page-disclaimer .usage-contact__card {
  padding: 24px 22px;
  border: 1px solid var(--mist-line);
  border-radius: var(--radius-lg);
  background: #fff;
}

.page-disclaimer .usage-contact__card--time {
  border-left: 3px solid var(--flame-500);
  background: linear-gradient(180deg, #fff 0%, rgba(47, 210, 168, .08) 100%);
}

.page-disclaimer .usage-contact__links {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-disclaimer .usage-contact__links li {
  font-size: 15px;
  line-height: 1.75;
}

.page-disclaimer .usage-contact__hours {
  margin: 14px 0 0;
  font-size: clamp(22px, 3vw, 28px) !important;
  color: var(--jade-700) !important;
  letter-spacing: .02em;
}

.page-disclaimer .usage-contact__meta {
  margin: 10px 0 0 !important;
  font-size: 14px !important;
  line-height: 1.75 !important;
  color: var(--graphite) !important;
}

.page-disclaimer .link-inline {
  color: var(--flame-500);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 106, 31, .38);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-disclaimer .link-inline:hover,
.page-disclaimer .link-inline:focus-visible {
  color: var(--flame-300);
  border-bottom-color: var(--flame-300);
}

/* ---------- 响应式 ---------- */

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

  .page-disclaimer .usage-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-disclaimer .usage-pair,
  .page-disclaimer .usage-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

@media (min-width: 980px) {
  .page-disclaimer .usage-sec__grid {
    grid-template-columns: var(--u-rail) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-disclaimer .usage-sec__num {
    font-size: 92px;
  }

  .page-disclaimer .usage-brief__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-disclaimer .brief-card {
    padding: 30px 26px 26px;
  }

  .page-disclaimer .usage-contact {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

@media (min-width: 1240px) {
  .page-disclaimer .usage-hero__body {
    max-width: 1000px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-disclaimer .brief-card,
  .page-disclaimer .brief-card__more,
  .page-disclaimer .link-inline,
  .page-disclaimer .usage-crumbs a {
    transition: none;
  }

  .page-disclaimer .brief-card:hover,
  .page-disclaimer .brief-card:focus-visible {
    transform: none;
  }
}