/* =========================================================
   Layout primitives — container, grid, sections.
   ========================================================= */

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 24px;
}
.container--wide { max-width: var(--container-wide); }
.container--prose { max-width: var(--container-prose); }
@media (max-width: 767px) {
  .container { padding-inline: 20px; }
}
@media (max-width: 360px) {
  .container { padding-inline: 16px; }
}

.section {
  padding-block: var(--section-py-desktop);
  position: relative;
}
.section--tight { padding-block: calc(var(--section-py-desktop) * 0.7); }
.section--soft { background: var(--color-surface-soft); }
.section--surface { background: var(--color-surface); }
.section--dark {
  background: radial-gradient(120% 90% at 0% 0%, #14213D 0%, #0B1220 60%, #060912 100%);
  color: var(--color-dark-text);
}
.section--dark h1, .section--dark h2, .section--dark h3 { color: #fff; }
.section--dark a { color: #fff; }

/* Section-head: small over-line + headline + lede */
.section-head { max-width: 760px; margin-bottom: var(--space-7); }
.section-head--center { margin-inline: auto; text-align: center; }
.section-head .eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: var(--fs-caption);
  font-weight: var(--fw-semibold);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: var(--color-primary-soft);
  padding: 6px 12px;
  border-radius: var(--radius-full);
  margin-bottom: var(--space-4);
}
.section-head .eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(20, 110, 245, 0.18);
}
.section-head h2 {
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
  font-size: 48px;
  line-height: 1.14;
  font-weight: var(--fw-extrabold);
}
@media (max-width: 1023px) {
  .section-head h2 {
    font-size: 40px;
    line-height: 1.14;
  }
}
@media (max-width: 767px) {
  .section-head h2 {
    font-size: 32px;
    line-height: 1.16;
  }
}
.section-head:has(.lede) h2 {
  margin-bottom: 0;
}
.section-head .lede {
  margin-top: 20px;
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--color-muted);
  max-width: 640px;
}
.section-head--center .lede { margin-inline: auto; }

/* 非首屏：区块主标题与简介（.lede）居中；不含 .hero / .page-hero / .about-hero */
main .section:not(.hero):not(.page-hero):not(.about-hero) .section-head {
  margin-inline: auto;
  text-align: center;
}
main .section:not(.hero):not(.page-hero):not(.about-hero) .section-head .lede {
  margin-inline: auto;
}

/* Grid templates */
.grid { display: grid; gap: var(--space-5); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 1023px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 639px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* Two-column with custom ratio (hero, product) */
.split {
  display: grid;
  gap: var(--space-7);
  align-items: center;
}
.split--5-7 { grid-template-columns: 5fr 7fr; }
.split--6-6 { grid-template-columns: 1fr 1fr; }
.split--7-5 { grid-template-columns: 7fr 5fr; }
@media (max-width: 1023px) {
  .split, .split--5-7, .split--6-6, .split--7-5 {
    grid-template-columns: 1fr;
    gap: var(--space-6);
  }
}

/* visually-broken alignment helpers */
.stack { display: flex; flex-direction: column; gap: var(--space-3); }
.stack-md { display: flex; flex-direction: column; gap: var(--space-5); }
.row { display: flex; flex-wrap: wrap; gap: var(--space-3); align-items: center; }
.row--center { justify-content: center; }
.row-end { justify-content: flex-end; }
.between { justify-content: space-between; }

/* Top divider effect for sections */
.section--rule {
  border-top: 1px solid var(--color-divider);
}

/* Decorative grid background */
.bg-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(to right, rgba(11, 18, 32, 0.04) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(11, 18, 32, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 30%, #000 30%, transparent 80%);
  pointer-events: none;
  z-index: 0;
}
.section > .container { position: relative; z-index: 1; }