/* ========== Reset & Base ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --bg: #ffffff;
  --bg-alt: #f5f5f7;
  --bg-subtle: #fafafa;
  --card: #ffffff;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.06), 0 8px 24px rgba(0,0,0,0.04);
  --card-hover-shadow: 0 2px 6px rgba(0,0,0,0.08), 0 16px 40px rgba(0,0,0,0.06);
  --card-border: rgba(0,0,0,0.06);
  --text: #1d1d1f;
  --text-dim: #6e6e73;
  --text-faint: #aeaeb2;
  --text-meta: #86868b;
  --accent-1: #6366f1;   /* indigo */
  --accent-2: #0ea5e9;   /* sky */
  --accent-3: #ec4899;   /* pink */
  --accent-4: #f59e0b;   /* amber */
  --accent-5: #3b82f6;   /* blue */
  --accent-6: #f97316;   /* orange */
  --grad-hero: linear-gradient(180deg, #f5f5f7 0%, #ffffff 100%);
  --grad-accent: linear-gradient(135deg, #6366f1, #0ea5e9);
  --radius: 16px;
  --radius-sm: 10px;
  --maxw: 1080px;
}
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  overflow-x: hidden;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ========== Container ========== */
.wrap { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; padding: 0 40px; }
section { padding: 100px 0; position: relative; }
section.alt { background: var(--bg-alt); }

/* ========== Section Title ========== */
.sec-title {
  text-align: center; margin-bottom: 60px;
  opacity: 0; transform: translateY(24px);
  transition: all 0.7s cubic-bezier(.23,1,.32,1);
}
.sec-title.in { opacity: 1; transform: translateY(0); }
.sec-tag {
  display: inline-block; font-size: 12px; letter-spacing: 3px; text-transform: uppercase;
  color: var(--accent-1); margin-bottom: 12px; font-weight: 600;
}
.sec-title h2 {
  font-size: 40px; font-weight: 700; letter-spacing: -0.5px; color: var(--text);
  line-height: 1.2;
}
.sec-title p { color: var(--text-dim); font-size: 17px; margin-top: 10px; font-weight: 400; }

/* ========== HERO ========== */
#hero {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  text-align: center; padding: 120px 40px 80px;
  background: linear-gradient(180deg, #f5f5f7 0%, #fafafa 40%, #ffffff 100%);
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 18px; border-radius: 100px;
  background: rgba(99,102,241,0.06); border: 1px solid rgba(99,102,241,0.15);
  font-size: 13px; color: var(--accent-1); font-weight: 600;
  margin-bottom: 32px;
  animation: fadeInDown 0.8s ease both;
}
.hero-badge .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--accent-1); animation: pulse 2s infinite; }
#hero h1 {
  font-size: 56px; font-weight: 700; line-height: 1.15; letter-spacing: -1px;
  margin-bottom: 20px; color: var(--text);
  animation: fadeInUp 0.8s 0.1s ease both;
}
#hero h1 .g1 { color: var(--accent-1); }
#hero h1 .g2 { color: var(--accent-3); }
#hero .sub {
  font-size: 19px; color: var(--text-dim); max-width: 680px; margin: 0 auto 44px;
  animation: fadeInUp 0.8s 0.25s ease both; font-weight: 400;
}
.hero-stats {
  display: flex; gap: 52px; justify-content: center; flex-wrap: wrap;
  animation: fadeInUp 0.8s 0.4s ease both;
}
.hero-stat { text-align: center; position: relative; cursor: pointer; }
.hero-stat .num { font-size: 40px; font-weight: 700; color: var(--accent-1); letter-spacing: -1px; transition: color 0.2s; }
.hero-stat:hover .num { color: var(--accent-2); }
.hero-stat .lbl { font-size: 13px; color: var(--text-meta); margin-top: 4px; font-weight: 500; }
/* Tooltip */
.hero-stat .tooltip {
  position: absolute; bottom: calc(100% + 16px); left: 50%; transform: translateX(-50%);
  background: var(--text); color: #ffffff; padding: 10px 18px; border-radius: 10px;
  font-size: 13px; font-weight: 500; white-space: nowrap; pointer-events: none;
  opacity: 0; transition: opacity 0.25s ease, transform 0.25s ease;
  transform: translateX(-50%) translateY(6px); z-index: 100;
  box-shadow: 0 8px 30px rgba(0,0,0,0.15);
}
.hero-stat .tooltip::after {
  content: ''; position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
  border: 7px solid transparent; border-top-color: var(--text);
}
.hero-stat:hover .tooltip { opacity: 1; transform: translateX(-50%) translateY(0); }
.scroll-hint {
  position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
  font-size: 12px; color: var(--text-faint); letter-spacing: 2px;
  animation: bounce 2s infinite;
}

/* ========== Problem Section ========== */
#problem { padding-bottom: 80px; }
.prob-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.prob-card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 40px 28px; text-align: center;
  box-shadow: var(--card-shadow);
  opacity: 0; transform: translateY(32px);
  transition: all 0.6s cubic-bezier(.23,1,.32,1);
}
.prob-card:hover { box-shadow: var(--card-hover-shadow); transform: translateY(-4px); }
.prob-card.in { opacity: 1; transform: translateY(0); }
.prob-card .icon { font-size: 38px; margin-bottom: 16px; }
.prob-card h3 { font-size: 18px; font-weight: 600; margin-bottom: 10px; color: var(--text); }
.prob-card p { font-size: 14px; color: var(--text-dim); line-height: 1.6; }
.prob-card .tag {
  display: inline-block; margin-top: 14px; padding: 4px 12px; border-radius: 6px;
  font-size: 11px; font-weight: 600;
}
.tag-red { background: rgba(236,72,153,0.08); color: var(--accent-3); }
.tag-gold { background: rgba(245,158,11,0.08); color: var(--accent-4); }
.tag-blue { background: rgba(59,130,246,0.08); color: var(--accent-5); }
.tag-orange { background: rgba(249,115,22,0.08); color: var(--accent-6); }

/* ========== Pipeline Section ========== */
#pipeline { padding-bottom: 120px; }
.pipe-container { position: relative; }
.pipe-step {
  display: flex; align-items: stretch; gap: 0; margin-bottom: 0;
  opacity: 0; transform: translateX(-36px);
  transition: all 0.7s cubic-bezier(.23,1,.32,1);
}
.pipe-step.in { opacity: 1; transform: translateX(0); }
.pipe-step.reverse { flex-direction: row-reverse; transform: translateX(36px); }
.pipe-step.reverse.in { transform: translateX(0); }

.step-rail {
  flex-shrink: 0; width: 76px; display: flex; flex-direction: column; align-items: center;
  position: relative;
}
.step-num {
  width: 52px; height: 52px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-size: 20px; font-weight: 700; color: #fff; position: relative; z-index: 2;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}
.step-line {
  flex: 1; width: 2px; background: linear-gradient(to bottom, var(--accent-1), transparent);
  margin-top: 6px; min-height: 40px;
}
.step-content { flex: 1; padding: 0 0 44px 24px; }
.pipe-step.reverse .step-content { padding: 0 24px 44px 0; text-align: right; }
.step-card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 32px 36px; box-shadow: var(--card-shadow);
  position: relative; overflow: hidden; text-align: left;
}
.pipe-step.reverse .step-card { text-align: left; }
.step-card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 4px; height: 100%; border-radius: 4px 0 0 4px;
}
.step-card.c1::before { background: var(--accent-1); }
.step-card.c2::before { background: var(--accent-2); }
.step-card.c3::before { background: var(--accent-3); }
.step-card.c4::before { background: var(--accent-4); }
.step-card.c5::before { background: var(--accent-5); }
.step-card.c6::before { background: var(--accent-6); }
.step-card h3 { font-size: 21px; font-weight: 600; margin-bottom: 8px; display: flex; align-items: center; gap: 10px; color: var(--text); }
.step-card .desc { font-size: 15px; color: var(--text-dim); margin-bottom: 16px; line-height: 1.65; }

.sub-streams { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 16px; }
.sub-stream {
  background: var(--bg-alt); border: 1px solid rgba(0,0,0,0.06);
  border-radius: var(--radius-sm); padding: 20px 16px; text-align: center;
  transition: all 0.3s ease; cursor: default;
}
.sub-stream:hover { background: rgba(99,102,241,0.04); transform: translateY(-3px); border-color: rgba(99,102,241,0.2); box-shadow: 0 4px 16px rgba(99,102,241,0.08); }
.sub-stream .s-icon { font-size: 26px; margin-bottom: 8px; }
.sub-stream .s-title { font-size: 14px; font-weight: 600; margin-bottom: 4px; color: var(--text); }
.sub-stream .s-desc { font-size: 12px; color: var(--text-meta); line-height: 1.5; }
.sub-stream .s-tech { font-size: 11px; margin-top: 6px; padding: 2px 8px; border-radius: 4px; display: inline-block; font-weight: 600; }

/* Competitor split grid */
.comp-split { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin-top: 16px; }
.comp-cell {
  background: rgba(249,115,22,0.03); border: 1px solid rgba(249,115,22,0.12);
  border-radius: var(--radius-sm); padding: 18px 14px; text-align: center;
  transition: all 0.3s ease; cursor: default; position: relative; overflow: hidden;
}
.comp-cell:hover { background: rgba(249,115,22,0.06); transform: translateY(-3px); border-color: rgba(249,115,22,0.3); box-shadow: 0 4px 16px rgba(249,115,22,0.08); }
.comp-cell .c-num { font-size: 18px; font-weight: 700; color: var(--accent-6); margin-bottom: 4px; }
.comp-cell .c-label { font-size: 13px; font-weight: 600; margin-bottom: 4px; color: var(--text); }
.comp-cell .c-desc { font-size: 11px; color: var(--text-meta); line-height: 1.5; }
.comp-cell .c-arrow-inner {
  position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
  font-size: 9px; color: var(--text-faint); opacity: 0; transition: opacity 0.3s;
}
.comp-cell:hover .c-arrow-inner { opacity: 1; }

.pills { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.pill {
  font-size: 11px; padding: 4px 12px; border-radius: 100px; font-weight: 600;
  background: rgba(99,102,241,0.06); color: var(--accent-1); border: 1px solid rgba(99,102,241,0.12);
}
.flow-arrow {
  text-align: center; margin: -18px 0 2px 76px; font-size: 18px; color: var(--text-faint);
  animation: arrowPulse 2s infinite;
}

/* Flow line */
.flow-line {
  position: absolute; bottom: 0; left: 0; height: 2px; width: 0;
  background: var(--grad-accent); transition: width 1.2s ease 0.3s; border-radius: 0 0 0 4px;
}
.step-card.in .flow-line { width: 100%; }
.step-card.in .flow-line,
.step-card:nth-child(1) .flow-line[style] { }

/* ========== Architecture ========== */
#arch .arch-wrap {
  background: var(--card); border: 1px solid var(--card-border); border-radius: 20px;
  padding: 48px 40px; box-shadow: var(--card-shadow);
  opacity: 0; transform: scale(0.97);
  transition: all 0.7s cubic-bezier(.23,1,.32,1);
}
#arch .arch-wrap.in { opacity: 1; transform: scale(1); }
.arch-layer { display: flex; align-items: center; gap: 16px; margin-bottom: 12px; }
.arch-layer-label {
  flex-shrink: 0; width: 120px; font-size: 13px; font-weight: 600; text-align: right; color: var(--text-dim);
}
.arch-boxes { display: flex; gap: 10px; flex: 1; flex-wrap: wrap; }
.arch-box {
  padding: 12px 18px; border-radius: 10px; font-size: 13px; font-weight: 600;
  text-align: center; flex: 1; min-width: 110px;
  border: 1px solid rgba(0,0,0,0.06); transition: all 0.3s ease;
  background: var(--bg-subtle);
}
.arch-box:hover { transform: translateY(-2px); box-shadow: 0 4px 12px rgba(0,0,0,0.06); }
.arch-box.b1 { background: rgba(99,102,241,0.06); border-color: rgba(99,102,241,0.15); color: var(--accent-1); }
.arch-box.b2 { background: rgba(14,165,233,0.06); border-color: rgba(14,165,233,0.15); color: var(--accent-2); }
.arch-box.b3 { background: rgba(236,72,153,0.06); border-color: rgba(236,72,153,0.15); color: var(--accent-3); }
.arch-box.b4 { background: rgba(245,158,11,0.06); border-color: rgba(245,158,11,0.15); color: var(--accent-4); }
.arch-box.b5 { background: rgba(59,130,246,0.06); border-color: rgba(59,130,246,0.15); color: var(--accent-5); }
.arch-arrow { text-align: center; color: var(--text-faint); font-size: 15px; margin: 2px 0 2px 120px; }

/* ========== Value ========== */
.val-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.val-card {
  background: var(--card); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 32px 24px; text-align: center; box-shadow: var(--card-shadow);
  opacity: 0; transform: translateY(32px);
  transition: all 0.6s cubic-bezier(.23,1,.32,1); position: relative; overflow: hidden;
}
.val-card:hover { box-shadow: var(--card-hover-shadow); transform: translateY(-4px); }
.val-card.in { opacity: 1; transform: translateY(0); }
.val-card::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0; height: 3px;
}
.val-card:nth-child(1)::after { background: var(--accent-1); }
.val-card:nth-child(2)::after { background: var(--accent-2); }
.val-card:nth-child(3)::after { background: var(--accent-3); }
.val-card:nth-child(4)::after { background: var(--accent-4); }
.val-card .v-num { font-size: 44px; font-weight: 700; margin-bottom: 8px; letter-spacing: -1px; }
.val-card:nth-child(1) .v-num { color: var(--accent-1); }
.val-card:nth-child(2) .v-num { color: var(--accent-2); }
.val-card:nth-child(3) .v-num { color: var(--accent-3); }
.val-card:nth-child(4) .v-num { color: var(--accent-4); }
.val-card .v-label { font-size: 14px; color: var(--text-dim); font-weight: 500; }

/* ========== CTA ========== */
#cta {
  text-align: center; padding: 100px 40px;
  background: linear-gradient(180deg, #f5f5f7, #ffffff);
}
#cta h2 { font-size: 36px; font-weight: 700; color: var(--text); margin-bottom: 12px; }
#cta p { color: var(--text-dim); font-size: 17px; margin-bottom: 36px; }
.cta-btn {
  display: inline-block; padding: 14px 44px; border-radius: 980px;
  background: var(--accent-1); color: #fff; font-size: 16px; font-weight: 600;
  text-decoration: none; transition: all 0.3s ease;
  box-shadow: 0 4px 16px rgba(99,102,241,0.2);
}
.cta-btn:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(99,102,241,0.3); background: #4f46e5; }
footer { text-align: center; padding: 36px 40px; color: var(--text-faint); font-size: 12px; border-top: 1px solid rgba(0,0,0,0.05); background: var(--bg-alt); }

/* ========== Animations ========== */
@keyframes fadeInUp { from { opacity:0; transform: translateY(32px); } to { opacity:1; transform: translateY(0); } }
@keyframes fadeInDown { from { opacity:0; transform: translateY(-16px); } to { opacity:1; transform: translateY(0); } }
@keyframes pulse { 0%,100% { opacity:1; } 50% { opacity:0.35; } }
@keyframes bounce { 0%,100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(8px); } }
@keyframes arrowPulse { 0%,100% { opacity:0.3; } 50% { opacity:1; } }

/* ========== Responsive ========== */
@media (max-width: 900px) {
  #hero h1 { font-size: 36px; }
  .hero-stats { gap: 28px; }
  .prob-grid { grid-template-columns: 1fr; }
  .sub-streams { grid-template-columns: 1fr; }
  .comp-split { grid-template-columns: repeat(2, 1fr); }
  .val-grid { grid-template-columns: repeat(2, 1fr); }
  .arch-layer-label { width: 70px; font-size: 11px; }
  .arch-arrow { margin-left: 70px; }
  .pipe-step.reverse { flex-direction: row; transform: translateX(-36px); }
  .pipe-step.reverse .step-content { text-align: left; padding: 0 0 44px 24px; }
  .hero-stat .num { font-size: 28px; }
  .hero-stat .tooltip { font-size: 11px; padding: 8px 14px; }
  .sec-title h2 { font-size: 28px; }
  .hero .sub { font-size: 16px; }
  .step-rail { width: 56px; }
  .step-num { width: 40px; height: 40px; font-size: 16px; }
  .flow-arrow { margin-left: 56px; }
}