/* =========================================================
   SIFIRbir 落地页 · 专属组件
   依赖 common.css 的 tokens / 动画 / 基础组件
   ========================================================= */

/* ---- Manifesto 引言块 ---- */
.manifesto-quote {
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3vw, 2.3rem);
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 22ch;
  margin: 0 0 3.5rem;
  padding-left: 1.6rem;
  border-left: 3px solid var(--signal);
}
.manifesto-quote strong { color: var(--signal); font-weight: 700; }
.manifesto-pillars .card-num {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--signal);
  letter-spacing: 0.06em;
}
.manifesto-pillars h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 800;
  margin: 0.8rem 0 0.6rem;
  letter-spacing: -0.01em;
}
.manifesto-pillars p { color: var(--ink-2); font-size: 0.98rem; }

/* ---- 创始人 ---- */
.founder-split {
  display: grid;
  grid-template-columns: minmax(260px, 380px) 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.founder-portrait { position: relative; }
.founder-portrait svg,
.founder-portrait img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
  box-shadow: 0 24px 60px -28px rgba(20, 23, 28, 0.4);
}
.founder-portrait img {
  aspect-ratio: 4 / 3;
  object-fit: cover;
  filter: grayscale(0.55) contrast(1.05);
}
.founder-cap {
  display: block;
  margin-top: 0.9rem;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--ink-3);
  text-align: center;
}
.founder-text p { color: var(--ink-2); font-size: 1.05rem; line-height: 1.7; }
.founder-text strong { color: var(--ink); }
.founder-sign {
  margin-top: 2rem;
  font-family: var(--font-display);
  font-style: italic;
  color: var(--signal);
  font-weight: 600;
}

/* ---- 三级洗水标准卡 ---- */
.tier-card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-top: 3px solid var(--signal);
  border-radius: var(--radius-md);
  padding: 2.2rem 1.9rem;
  transition: transform var(--dur-mid) var(--ease-out-quart),
    box-shadow var(--dur-mid) var(--ease-out-quart);
}
.tier-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 22px 50px -24px var(--signal-glow);
}
.tier-no {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--signal);
  text-transform: uppercase;
}
.tier-card h3 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 800;
  margin: 0.7rem 0 0.7rem;
  letter-spacing: -0.01em;
}
.tier-card p { color: var(--ink-2); font-size: 0.98rem; }

/* ---- 作品 / 产品特写 ---- */
.work-split {
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.work-media {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  width: 100%;
  max-width: 420px;
  max-height: 540px;
  justify-self: center;
  background: var(--surface-2);
}
.work-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: contrast(1.02);
  transition: transform var(--dur-slow) var(--ease-out-quart);
}
.work-media:hover img { transform: scale(1.04); }
.work-badge {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  background: rgba(20, 23, 28, 0.82);
  color: var(--paper);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  backdrop-filter: blur(6px);
}
.work-text p { color: var(--ink-2); }

/* ---- CTA band ---- */
.cta-band { text-align: center; }
.cta-band .container { max-width: 760px; }
.cta-title {
  text-align: center;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
}
.cta-band .hero-btns { justify-content: center; }

/* ---- 业务卡图标 ---- */
.card-icon svg { width: 26px; height: 26px; }

/* ---- 发展历程：两栏布局 ---- */
.timeline-layout {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}
.timeline-layout .section-head {
  margin-bottom: 0;
  position: sticky;
  top: calc(var(--header-h) + 2rem);
}

/* ---- 「零」标签组 ---- */
.zero-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-bottom: 3.5rem;
}
.zero-pill {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--ink);
  background: var(--paper);
  border: 1.5px solid var(--ink);
  border-radius: 999px;
  padding: 0.6rem 1.3rem;
  position: relative;
}
.zero-pill::before {
  content: "0";
  color: var(--signal);
  font-weight: 900;
  margin-right: 0.45rem;
}

/* ---- 技术数据 ---- */
.tech-split {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.tech-media {
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  background: var(--surface-2);
}
.tech-media img {
  width: 100%; height: 100%;
  object-fit: cover; display: block;
  filter: grayscale(0.5) contrast(1.05);
}
.water-claim {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin-bottom: 0.6rem;
}
.water-claim .from {
  color: var(--ink-3);
  text-decoration: line-through;
  text-decoration-color: var(--signal);
  margin-right: 0.5rem;
}
.water-claim .arrow { color: var(--signal); margin: 0 0.5rem; }
.water-claim .to { color: var(--signal); }
.water-note { color: var(--ink-2); margin-bottom: 2rem; max-width: 46ch; }
.benefit-row {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.4rem 2rem;
  border-top: 1px solid var(--line);
  padding-top: 1.6rem;
}
.benefit .b-num {
  font-family: var(--font-display);
  font-size: 2.1rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
  display: block;
}
.benefit .b-num em { font-style: normal; color: var(--signal); font-size: 1.3rem; }
.benefit .b-lbl { font-size: 0.85rem; color: var(--ink-3); }

/* ---- 合作品牌墙 ---- */
.brand-wall {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}
@media (max-width: 900px) { .brand-wall { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 520px) { .brand-wall { grid-template-columns: repeat(2, 1fr); } }
.brand-wall span {
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2.1rem 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-3);
  font-size: 1.05rem;
  filter: grayscale(1);
  transition: color var(--dur-fast) var(--ease-out-quart),
    background var(--dur-fast) var(--ease-out-quart),
    transform var(--dur-fast) var(--ease-out-quart);
}
.brand-wall span:hover {
  color: var(--ink);
  background: var(--surface);
  transform: scale(1.04);
}
.brand-note {
  margin-top: 1.5rem;
  font-size: 0.8rem;
  color: var(--ink-3);
  line-height: 1.6;
  max-width: 70ch;
}

/* ---- 响应式 ---- */
@media (max-width: 860px) {
  .founder-split,
  .work-split,
  .tech-split { grid-template-columns: 1fr; }
  .founder-portrait { max-width: 360px; margin: 0 auto; }
  .timeline-layout { grid-template-columns: 1fr; }
  .timeline-layout .section-head { position: static; margin-bottom: 2rem; }
  .work-media { aspect-ratio: 3 / 4; margin: 0 auto; }
  .nav-links li:not(.nav-cta-li) { display: none; }
  .manifesto-quote { max-width: none; }
  .water-claim .from, .water-claim .to, .water-claim .arrow { display: inline-block; }
}