/* ===== Hero ===== */
.hero {
  position: relative;
  padding-top: 40px;
  padding-bottom: 40px;
  overflow: hidden;
}
.hero-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
  position: relative;
}
.hero-meta {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  padding: 18px 0;
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);
  font-family: var(--f-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}
.hero-meta div span { display: block; color: var(--mute); margin-bottom: 4px; }
.hero-meta div strong { font-weight: 400; color: var(--ink); }
@media (max-width: 800px) {
  .hero-meta { grid-template-columns: repeat(2, 1fr); }
}

.hero-title {
  margin: 48px 0 24px;
  font-size: clamp(64px, 11.5vw, 180px);
}
.hero-title .red { color: var(--red); }
.hero-title .underline {
  position: relative;
  white-space: nowrap;
}
.hero-title .underline::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0.05em;
  height: 8px;
  background: var(--red);
}

.hero-row {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 60px;
  align-items: middle;
  margin-top: 48px;
}
@media (max-width: 900px) {
  .hero-row { grid-template-columns: 1fr; }
}
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 24px; }

/* Device sketch */
.device {
  position: relative;
  aspect-ratio: 1 / 1;
  border: 1px solid var(--ink);
  background: var(--paper-2);
  padding: 24px;
  display: grid;
  place-items: center;
  overflow: hidden;
}
.device::before {
  content: "FIG. 01 — ELECTRODE RING ARRAY";
  position: absolute; top: 12px; left: 14px;
  font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.14em;
  color: var(--mute);
}
.device::after {
  content: "02A / 16CH";
  position: absolute; bottom: 12px; right: 14px;
  font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.14em;
  color: var(--mute);
}
.ring-svg { width: 78%; height: 78%; }

/* Dot-matrix background panel on hero */
.hero-dots {
  position: absolute;
  right: calc(-1 * var(--pad));
  top: -20px;
  width: 260px;
  height: 260px;
  --d: 3px; --g: 18px;
  opacity: 0.9;
  pointer-events: none;
  mask-image: linear-gradient(225deg, black 40%, transparent 100%);
}

/* ===== Stats / problem ===== */
.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--ink);
  border: 1px solid var(--ink);
}
.stat {
  background: var(--paper);
  padding: 36px 28px;
  min-height: 240px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.stat .big {
  font-family: var(--f-display);
  font-size: clamp(44px, 5vw, 72px);
  line-height: 0.9;
  letter-spacing: -0.03em;
}
.stat .big .red { color: var(--red); }
.stat p { font-size: 14px; color: var(--ink-2); margin: 0; line-height: 1.45; }
.stat .idx { font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.14em; color: var(--mute); }
@media (max-width: 900px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 520px) {
  .stats { grid-template-columns: 1fr; }
}

/* ===== Solution ===== */
.solution {
  display: flex;
  flex-direction: column;
  gap: 48px;
}
.solution-visual {
  border: 1px solid var(--ink);
  aspect-ratio: 16 / 9;
  position: relative;
  overflow: hidden;
  background: whitesmoke;
  color: var(--paper);
  width: 100%;
}
.solution-body-grid {
  display: grid;
  grid-template-columns: 1fr 1.4fr;
  gap: 60px;
  align-items: start;
}
@media (max-width: 900px) {
  .solution-body-grid { grid-template-columns: 1fr; gap: 32px; }
}
.scan-dots {
  position: absolute; inset: 0;
  --d: 2.5px; --g: 14px;
  background-image: radial-gradient(circle, var(--red) 0 var(--d), transparent calc(var(--d) + 0.5px));
  background-size: var(--g) var(--g);
  opacity: 0.5;
}
.scan-line {
  position: absolute;
  left: 0; right: 0;
  height: 2px;
  background: var(--red);
  box-shadow: 0 0 24px var(--red);
  animation: scan 3.5s ease-in-out infinite;
}
@keyframes scan {
  0%, 100% { top: 8%; opacity: 0; }
  10% { opacity: 1; }
  50% { top: 92%; opacity: 1; }
  60% { opacity: 0; }
}
.solution-visual .ring-label {
  position: absolute;
  top: 24px; left: 24px;
  font-family: var(--f-mono); font-size: 11px;
  letter-spacing: 0.14em; text-transform: uppercase;
  color: #807e75;
}
.slider-track {
  position: absolute;
  inset: 0;
  top: 36px;
  bottom: 44px;
}
.slide {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  opacity: 0;
  transition: opacity 0.4s ease;
}
.slide.active { opacity: 1; }
.slider-controls {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 16px;
  border-top: 1px solid rgba(255,255,255,0.12);
  background: rgba(10,10,10,0.6);
}
.slider-btn {
  background: none;
  border: none;
  color: var(--paper);
  font-size: 16px;
  cursor: pointer;
  padding: 4px 8px;
  opacity: 0.7;
  transition: opacity 0.2s;
}
.slider-btn:hover { opacity: 1; }
.slider-dots { display: flex; gap: 6px; align-items: center; }
.slider-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: rgba(255,255,255,0.35);
  transition: background 0.2s;
}
.slider-dot.active { background: var(--red); }

.solution-body h2 { margin: 16px 0 24px; }
.bullets {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  border-top: 1px solid var(--ink);
}
.bullets li {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--ink);
  align-items: start;
}
.bullets li .no {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--red);
  padding-top: 3px;
}
.bullets li h4 {
  font-family: var(--f-display);
  font-size: 22px;
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 0 0 6px;
}
.bullets li p { margin: 0; color: var(--ink-2); font-size: 15px; }

/* ===== Hardware ===== */
.hardware-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
  align-items: end;
}
@media (max-width: 800px) { .hardware-head { grid-template-columns: 1fr; } }

.hw-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
@media (max-width: 800px) { .hw-cards { grid-template-columns: 1fr; } }

.hw-card {
  border: 1px solid var(--ink);
  padding: 0;
  display: flex;
  flex-direction: column;
  background: var(--paper);
}
.hw-card .hw-vis {
  aspect-ratio: 16 / 10;
  background: var(--paper-2);
  border-bottom: 1px solid var(--ink);
  position: relative;
  overflow: hidden;
  display: grid;
  place-items: center;
}
.hw-card .hw-body { padding: 28px 28px 32px; }
.hw-card h3 {
  font-family: var(--f-display);
  font-size: clamp(24px, 2.4vw, 32px);
  letter-spacing: -0.02em;
  margin: 12px 0 14px;
  line-height: 1.05;
}
.hw-card p { color: var(--ink-2); margin: 0; font-size: 15px; line-height: 1.55; }
.hw-card .hw-tag {
  display: inline-block;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 4px 10px;
  border: 1px solid var(--ink);
  border-radius: 999px;
  background: var(--paper);
}
.hw-spots {
  display: flex; flex-wrap: wrap; gap: 6px;
  margin-top: 20px;
}
.hw-spots span {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: 5px 10px;
  border: 1px solid var(--ink);
  border-radius: 999px;
}

/* ===== Edge (Hilbert-Huang) ===== */
.edge {
  background: var(--ink);
  color: var(--paper);
  padding: 100px 0;
  position: relative;
  overflow: hidden;
}
.edge-inner { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); position: relative; z-index: 2; }
.edge-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
@media (max-width: 900px) { .edge-row { grid-template-columns: 1fr; } }
.edge .tag { color: var(--red); }
.edge h2 { color: var(--paper); margin: 16px 0 24px; }
.edge p { color: #c9c7bf; font-size: 17px; max-width: 52ch; }

.waveform {
  aspect-ratio: 1 / 1;
  border: 1px solid #2a2a28;
  padding: 28px;
  position: relative;
  background:
    linear-gradient(var(--ink), var(--ink)),
    repeating-linear-gradient(0deg, #181817 0 1px, transparent 1px 40px),
    repeating-linear-gradient(90deg, #181817 0 1px, transparent 1px 40px);
  background-blend-mode: normal;
}
.waveform::before, .waveform::after {
  content: "";
  position: absolute; inset: 28px;
  background:
    repeating-linear-gradient(0deg, rgba(128,126,117,0.2) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, rgba(128,126,117,0.2) 0 1px, transparent 1px 34px);
}
.waveform svg { position: absolute; inset: 28px; width: calc(100% - 56px); height: calc(100% - 56px); z-index: 2; }
.wave-label {
  position: absolute;
  font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.14em;
  color: #807e75;
  z-index: 3;
  text-transform: uppercase;
}
.wave-label.tl { top: 12px; left: 14px; }
.wave-label.tr { top: 12px; right: 14px; color: var(--red); }
.wave-label.bl { bottom: 12px; left: 14px; }
.wave-label.br { bottom: 12px; right: 14px; }

/* ===== Timeline ===== */
.timeline {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
  margin-top: 40px;
  border-top: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
}
.tl-col {
  padding: 28px 24px 32px;
  border-right: 1px solid var(--ink);
  position: relative;
  min-height: 340px;
}
.tl-col:last-child { border-right: none; }
.tl-col .phase {
  font-family: var(--f-display);
  font-size: 40px;
  line-height: 1;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
  display: flex;
  align-items: baseline;
  gap: 10px;
}
.tl-col .phase small {
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--mute);
  font-weight: 400;
}
.tl-col h5 {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mute);
  margin: 0 0 16px;
  font-weight: 400;
}
.tl-col ul {
  list-style: none; padding: 0; margin: 0;
  font-size: 14px;
  line-height: 1.45;
}
.tl-col ul li {
  padding: 8px 0 8px 18px;
  position: relative;
  border-bottom: 1px dashed rgba(10,10,10,0.15);
}
.tl-col ul li:last-child { border-bottom: none; }
.tl-col ul li::before {
  content: "";
  position: absolute; left: 0; top: 15px;
  width: 6px; height: 6px;
  background: var(--red);
  border-radius: 50%;
}
.tl-col.active {
  background: var(--ink);
  color: var(--paper);
}
.tl-col.active h5 { color: #807e75; }
.tl-col.active ul li { border-color: rgba(255,255,255,0.1); }
@media (max-width: 900px) {
  .timeline { grid-template-columns: 1fr 1fr; }
  .tl-col { border-bottom: 1px solid var(--ink); }
  .tl-col:nth-child(2n) { border-right: none; }
}
@media (max-width: 520px) {
  .timeline { grid-template-columns: 1fr; }
  .tl-col { border-right: none; }
}

/* ===== Ask ===== */
.ask {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
  padding: 100px 0;
}
@media (max-width: 900px) { .ask { grid-template-columns: 1fr; gap: 40px; padding: 60px 0; } }
.ask-amount {
  font-family: var(--f-display);
  font-size: clamp(80px, 13vw, 200px);
  line-height: 0.9;
  letter-spacing: -0.04em;
}
.ask-amount .red { color: var(--red); }
.ask-amount small {
  display: block;
  font-family: var(--f-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  margin-top: 14px;
  color: var(--mute);
  text-transform: uppercase;
}

/* ===== CTA ===== */
.cta-band {
  background: var(--red);
  color: var(--paper);
  padding: 80px var(--pad);
  border-radius: 0;
  margin: 0 auto;
  max-width: var(--maxw);
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  align-items: center;
}
@media (max-width: 800px) { .cta-band { grid-template-columns: 1fr; } }
.cta-band h2 { margin: 0; color: var(--paper); letter-spacing: -0.03em; }
.cta-band .btn { background: var(--ink); border-color: var(--ink); color: var(--paper); }
.cta-band .btn:hover { background: var(--paper); color: var(--ink); border-color: var(--paper); }

/* ===== Section header ===== */
.sec-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
  gap: 40px;
  padding: 24px 0;
  border-bottom: 2px solid var(--ink);
  margin-bottom: 48px;
}
.sec-head-l { max-width: 70%; }
.sec-head h2 { margin: 12px 0 0; }
.sec-head .num {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mute);
  text-transform: uppercase;
}
@media (max-width: 700px) {
  .sec-head { flex-direction: column; align-items: flex-start; }
  .sec-head-l { max-width: 100%; }
}