/* ============================================================
   Mia — Feature section: 多端互通 · 多内核兼容
   Clean two-card layout (replaces the old single-step scrollytelling).
   ============================================================ */
.feat {
  position: relative;
  z-index: 1;
  padding: clamp(36px, 5vw, 64px) 0 clamp(76px, 10vw, 132px);
  background: #ffffff;
}

.feat-head {
  text-align: center;
  max-width: 660px;
  margin: 0 auto clamp(40px, 6vw, 66px);
}
.feat-kicker {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  margin-bottom: 16px;
}
.feat-head h2 {
  font-size: clamp(30px, 4.4vw, 50px);
  font-weight: 640;
  letter-spacing: -0.03em;
  line-height: 1.1;
  margin: 0 0 16px;
  color: var(--ink);
  text-wrap: balance;
}
.feat-head p {
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0;
  text-wrap: pretty;
}

/* ── merged feature card: one clean card, two blocks, no boxy nesting ── */
.feat-merged {
  max-width: 600px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(26px, 3vw, 38px);
  display: flex;
  flex-direction: column;
  gap: clamp(22px, 2.6vw, 30px);
}
.fm-cap {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink);
}
.fm-desc {
  margin: 8px 0 18px;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink-2);
}
.fm-rule { height: 1px; background: var(--line); }

/* devices: icon+label tiles joined by short connectors */
.fm-devs { display: flex; align-items: center; gap: 10px; }
.fm-dev {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 16px 6px;
  border-radius: 14px;
  background: var(--bg);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-2);
}
.fm-dev svg { width: 26px; height: 26px; fill: none; stroke: var(--ink); stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.fm-conn { width: 14px; height: 2px; border-radius: 2px; background: var(--line-strong); flex: none; }

/* engines: logo+name chips in a row */
.fm-engs { display: flex; gap: 10px; }
.fm-eng {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 8px;
  border-radius: 14px;
  background: var(--bg);
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
}
.fm-eng img, .fm-eng svg { width: 22px; height: 22px; }

@media (max-width: 560px) {
  .fm-dev { font-size: 12px; padding: 13px 4px; }
  .fm-eng { flex-direction: column; gap: 6px; font-size: 12.5px; }
}

.feat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(18px, 2.2vw, 26px);
  max-width: 1000px;
  margin: 0 auto;
}
.feat-card {
  display: flex;
  flex-direction: column;
  gap: clamp(26px, 3vw, 40px);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(26px, 3vw, 38px);
  box-shadow: var(--shadow);
}
.feat-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 5px 12px;
  border-radius: 999px;
}
.feat-card-top h3 {
  font-size: clamp(20px, 2.2vw, 25px);
  font-weight: 620;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 14px 0 10px;
  color: var(--ink);
}
.feat-card-top p {
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--ink-2);
  margin: 0;
}

/* ---- 多端互通: three device tiles linked by a synced line ---- */
.feat-devices {
  position: relative;
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-top: auto;
  padding: 26px 4px 4px;
}
.feat-devices::before {
  content: "";
  position: absolute;
  left: 44px;
  right: 44px;
  top: 58px;
  height: 2px;
  background: repeating-linear-gradient(90deg, var(--line-strong) 0 6px, transparent 6px 12px);
  z-index: 0;
}
.feat-synced {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  font-size: 11px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
}
.feat-dev {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 11px;
}
.feat-ic {
  width: 66px;
  height: 66px;
  border-radius: 18px;
  background: var(--surface);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-sm);
}
.feat-ic svg {
  width: 28px;
  height: 28px;
  fill: none;
  stroke: var(--accent);
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.feat-dev b {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-2);
}

/* ---- 多内核兼容: engine list ---- */
.feat-engines {
  list-style: none;
  margin: auto 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.feat-engines li {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  border-radius: 15px;
  background: var(--surface);
  border: 1px solid var(--line);
}
.feat-logo {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: var(--surface);
  display: grid;
  place-items: center;
  box-shadow: var(--shadow-sm);
}
.feat-logo img,
.feat-logo svg { width: 24px; height: 24px; }
.feat-eng-name {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.feat-eng-role {
  font-size: 12.5px;
  color: var(--ink-3);
  white-space: nowrap;
}

@media (max-width: 760px) {
  .feat-grid { grid-template-columns: 1fr; }
  .feat-eng-role { display: none; }
}