/* sections.css —— 顶栏 + S1–S6 视觉。依赖：tokens/base/layout/components/mock */

/* ================= 通用零件 ================= */
.sec-head > * + * { margin-top: 16px; }
.sec-head--center { text-align: center; }
.sec-head--center .lead { margin-inline: auto; }

.tension {
  margin: 0;
  padding-left: 18px;
  border-left: 2px solid var(--site-accent);
  font-size: var(--site-body-md);
  line-height: var(--site-lh-body);
  color: var(--site-text-1);
}
.tension p + p { margin-top: 12px; }
.on-dark .tension { border-left-color: var(--site-ink-text-3); color: var(--site-ink-text-1); }

.result-list { display: grid; gap: 12px; }
.result-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: var(--site-body-sm);
  line-height: 1.6;
}
.result-list .icon { color: var(--site-ink-text-2); margin-top: 2px; }
.result-list b { color: var(--site-ink-text-1); font-weight: 600; margin-right: 6px; }

/* ================= 顶栏 ================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--site-z-header);
  background: var(--site-surface);
  border-bottom: 1px solid var(--site-border);
}
.site-header__inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 64px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--site-text-1);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.brand__mark {
  width: 26px;
  height: 26px;
  border-radius: var(--site-radius-sm);
  background: var(--site-ink-800);
  color: var(--site-surface);
  display: grid;
  place-items: center;
  font-size: 13px;
  font-weight: 600;
}
.site-nav { display: flex; gap: 4px; margin-left: auto; }
.site-nav a {
  display: inline-flex;
  align-items: center;
  height: 40px;
  padding: 0 12px;
  border-radius: var(--site-radius-sm);
  font-size: var(--site-body-sm);
  color: var(--site-text-2);
  text-decoration: none;
  transition: background-color var(--site-dur-fast) var(--site-ease);
}
.site-nav a:hover { background: var(--site-surface-2); color: var(--site-text-1); }
.site-header__cta { display: inline-flex; }

.site-header--on-hero {
  background: transparent;
  border-bottom-color: rgba(255, 255, 255, 0.12);
}
.site-header--on-hero .brand { color: #fff; }
.site-header--on-hero .brand__mark { background: rgba(255, 255, 255, 0.18); color: #fff; }
.site-header--on-hero .site-nav a { color: rgba(255, 255, 255, 0.85); }
.site-header--on-hero .site-nav a:hover { background: rgba(255, 255, 255, 0.12); color: #fff; }
.site-header--on-hero .site-header__cta.btn--primary {
  background: #fff;
  color: var(--site-accent);
}
.site-header--on-hero .site-header__cta.btn--primary:hover {
  background: var(--site-ink-text-1);
}

@media (max-width: 899px) {
  .site-nav { display: none; }
  .site-header__cta { margin-left: auto; }
}

/* ================= S1 Hero ================= */
.hero {
  position: relative;
  overflow: hidden;
  padding-top: 120px;
  padding-bottom: var(--site-section-y);
  background:
    radial-gradient(circle at 50% 0%, var(--site-accent-soft-2), transparent 60%),
    var(--site-bg);
}
.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: var(--site-grid-gap);
  align-items: center;
}
.hero__lead { margin-top: 20px; }
.hero__cta { margin-top: 32px; display: grid; grid-template-columns: 1fr 1fr; gap: 12px; align-items: stretch; }
.hero__cta .btn { flex-direction: column; align-items: stretch; justify-content: center; gap: 4px; min-height: 56px; white-space: normal; min-width: 0; }

.hero__visual { min-width: 0; }
@media (min-width: 1280px) {
  .hero__visual { margin-right: -80px; }
}

.facts {
  margin-top: var(--site-stack);
  padding-top: 28px;
  border-top: 1px solid var(--site-border);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--site-grid-gap);
}
.fact__value {
  font-size: clamp(1.5rem, 1.2rem + 1vw, 2rem);
  font-weight: 600;
  color: var(--site-text-1);
  font-family: var(--site-font-mono);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}
.fact__unit { font-size: var(--site-body-sm); color: var(--site-text-2); margin-left: 6px; font-weight: 400; }
.fact__label { margin-top: 6px; font-size: var(--site-body-sm); color: var(--site-text-2); }

@media (max-width: 767px) {
  .hero { padding-top: 88px; }
  .hero__grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 32px;
  }
  .hero__visual {
    margin: 0;
    justify-self: center;
    width: 100%;
    max-width: 280px;
  }
  .hero__mock--mobile {
    max-width: 100%;
    width: 100%;
    margin-inline: auto;
  }
  .hero__text { text-align: center; }
  .hero__cta {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    margin-top: 24px;
  }
  .hero__cta .btn { width: 100%; align-items: center; }
  .facts { grid-template-columns: repeat(2, minmax(0, 1fr)); row-gap: 24px; }
  .hero__mock--pc { display: none !important; }
  .hero__mock--mobile { display: block; }
}
@media (min-width: 768px) {
  .hero__mock--mobile { display: none !important; }
}

/* ================= S2 痛点 ================= */
.pain-list { border-top: 1px solid var(--site-border); }
.pain-item {
  display: grid;
  grid-template-columns: 24px minmax(0, 1fr);
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--site-border);
}
.pain-item .icon { color: var(--site-text-3); margin-top: 3px; }
.pain-item__title { font-size: var(--site-body-md); font-weight: 600; color: var(--site-text-1); }
.pain-item__desc { margin-top: 6px; font-size: var(--site-body-sm); line-height: 1.6; color: var(--site-text-2); }
.soft-cta {
  margin-top: 28px;
  font-size: var(--site-body-md);
  line-height: 1.6;
  color: var(--site-text-1);
}
.soft-cta .link { color: var(--site-accent); }

/* ================= S3 方案主张（深 · 呼吸位） ================= */
.flow {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--site-grid-gap);
}
.flow__step {
  position: relative;
  padding-top: 18px;
  border-top: 1px solid var(--site-ink-border);
}
.flow__step::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  border-radius: var(--site-radius-pill);
  background: var(--site-ink-text-3);
}
.flow__label { font-size: var(--site-body-md); font-weight: 600; color: var(--site-ink-text-1); }
.flow__desc { margin-top: 6px; font-size: var(--site-body-sm); color: var(--site-ink-text-2); }
.flow__arrow { display: none; }
@media (max-width: 767px) {
  .flow { grid-template-columns: minmax(0, 1fr); gap: 20px; }
  .flow__step { padding-top: 0; padding-left: 18px; border-top: 0; border-left: 1px solid var(--site-ink-border); }
  .flow__step::before { top: 6px; left: -4px; }
}

/* ================= S4 六大模块 Bento ================= */
.bento {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--site-grid-gap);
}
.bento__item {
  background: var(--site-surface);
  border: 1px solid var(--site-border);
  border-radius: var(--site-radius-lg);
  padding: 24px;
  min-width: 0;
  transition:
    border-color var(--site-dur-fast) var(--site-ease),
    box-shadow var(--site-dur-fast) var(--site-ease);
}
.bento__item:hover { border-color: var(--site-accent); box-shadow: var(--site-shadow-raised); }
.bento__item--a { grid-column: span 8; grid-row: span 2; }
.bento__item--b,
.bento__item--c,
.bento__item--e,
.bento__item--f { grid-column: span 4; }
.bento__item--d { grid-column: span 8; grid-row: span 2; }
.bento__title {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 600;
  color: var(--site-text-1);
}
.bento__title .icon { color: var(--site-accent); }
.bento__desc { margin-top: 8px; font-size: var(--site-body-sm); line-height: 1.6; color: var(--site-text-2); }
.bento__chips { margin-top: 14px; display: flex; flex-wrap: wrap; gap: 8px; }
.bento__mock { margin-top: 18px; }

@media (max-width: 1023px) {
  .bento__item--a,
  .bento__item--b,
  .bento__item--c,
  .bento__item--d,
  .bento__item--e,
  .bento__item--f { grid-column: span 6; grid-row: auto; }
}
@media (max-width: 767px) {
  .bento__item--a,
  .bento__item--b,
  .bento__item--c,
  .bento__item--d,
  .bento__item--e,
  .bento__item--f { grid-column: span 12; }
  .bento__item { padding: 20px; }
}