/* ============================================================
   ZZPass security page — extends landing.css
   ============================================================ */

/* ============== HERO ============== */
.sec-hero {
  position: relative;
  padding: 96px 0 88px;
  overflow: hidden;
}
.sec-hero .hero-bloom { top: -240px; height: 720px; }
.sec-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
@media (max-width: 980px) {
  .sec-hero-grid { grid-template-columns: 1fr; gap: 56px; }
}
.sec-hero h1 {
  font-family: 'Instrument Serif', serif;
  font-size: clamp(48px, 6vw, 80px);
  line-height: 1.02;
  letter-spacing: -0.022em;
  margin: 22px 0 26px;
  text-wrap: balance;
}
.sec-hero h1 em { font-style: italic; color: var(--teal-deep); }
.sec-hero .lede {
  font-size: clamp(17px, 1.35vw, 19.5px);
  color: var(--ink-2);
  line-height: 1.55;
  max-width: 540px;
  text-wrap: pretty;
}

/* Vault visual — concentric encryption layers */
.vault-visual {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 520px;
  width: 100%;
  margin-left: auto;
  display: flex;
  align-items: center;
  justify-content: center;
}
.vault-ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid var(--rule-2);
  display: flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px;
  letter-spacing: 0.18em;
  color: var(--ink-mute);
  text-transform: uppercase;
}
.vault-ring::before {
  content: ''; position: absolute; inset: 0; border-radius: 50%;
  border: 1px dashed rgba(60,166,155,0.25);
  animation: vault-spin 60s linear infinite;
}
.vault-ring.r1 { width: 96%; height: 96%; }
.vault-ring.r2 { width: 76%; height: 76%; border-color: rgba(60,166,155,0.3); }
.vault-ring.r3 { width: 56%; height: 56%; border-color: rgba(60,166,155,0.45); }
.vault-ring.r2::before { animation-duration: 90s; animation-direction: reverse; }
.vault-ring.r3::before { animation-duration: 120s; }

@keyframes vault-spin {
  to { transform: rotate(360deg); }
}

.vault-tag {
  position: absolute;
  background: var(--bg);
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid var(--rule);
  display: inline-flex; align-items: center; gap: 6px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.12em;
  color: var(--ink-2);
  white-space: nowrap;
}
.vault-tag .tdot { width: 5px; height: 5px; border-radius: 50%; background: var(--teal); }

.vt-1 { top: -8px; left: 50%; transform: translateX(-50%); }
.vt-2 { right: 6%; top: 18%; }
.vt-3 { bottom: 18%; left: 4%; }
.vt-4 { bottom: -8px; left: 50%; transform: translateX(-50%); }

.vault-core {
  position: relative;
  width: 36%; aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: linear-gradient(160deg, var(--ink) 0%, #0E1014 100%);
  display: flex; align-items: center; justify-content: center;
  box-shadow:
    0 0 0 8px rgba(60,166,155,0.12),
    0 30px 60px -20px rgba(20,21,24,0.4);
  z-index: 2;
}
.vault-core::before {
  content: ''; position: absolute; inset: -22px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--teal-glow), transparent 70%);
  z-index: -1;
}
.vault-core svg { color: var(--teal); }
.vault-core-tag {
  position: absolute; bottom: -10px; left: 50%; transform: translateX(-50%);
  background: var(--teal); color: #0F1518;
  padding: 4px 10px; border-radius: 999px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 0.16em; font-weight: 600;
  white-space: nowrap;
}

.vault-particles {
  position: absolute; inset: 0;
  pointer-events: none;
}
.vp {
  position: absolute;
  width: 8px; height: 8px;
  border-radius: 2px;
  background: var(--teal);
  opacity: 0.5;
}
.vp.p1 { top: 20%; left: 12%; animation: vfloat 7s ease-in-out infinite; }
.vp.p2 { top: 70%; right: 10%; animation: vfloat 9s ease-in-out infinite reverse; }
.vp.p3 { top: 12%; right: 30%; width: 6px; height: 6px; animation: vfloat 8s ease-in-out infinite 1s; }
.vp.p4 { bottom: 16%; left: 22%; width: 6px; height: 6px; animation: vfloat 11s ease-in-out infinite 0.4s; }

@keyframes vfloat {
  0%, 100% { transform: translate(0, 0); opacity: 0.4; }
  50% { transform: translate(10px, -14px); opacity: 0.85; }
}

/* ============== FOUR PRINCIPLES ============== */
.principles {
  background: var(--bg);
  padding: 80px 0 110px;
}
.principles .sec-head { margin-bottom: 48px; }

.principle-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
@media (max-width: 980px) { .principle-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .principle-grid { grid-template-columns: 1fr; } }

.principle {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 18px;
  padding: 28px 24px 30px;
  display: flex; flex-direction: column; gap: 14px;
  position: relative;
  overflow: hidden;
}
.principle::before {
  content: ''; position: absolute;
  top: -40px; right: -40px;
  width: 120px; height: 120px; border-radius: 50%;
  background: radial-gradient(circle, var(--teal-glow), transparent 70%);
  opacity: 0.5;
}
.pr-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.16em;
  color: var(--ink-mute);
}
.pr-ic {
  width: 48px; height: 48px; border-radius: 12px;
  background: var(--teal-soft); color: var(--teal-deep);
  display: inline-flex; align-items: center; justify-content: center;
}
.principle h3 {
  font-family: 'Instrument Serif', serif;
  font-size: 26px; line-height: 1.1; letter-spacing: -0.015em;
}
.principle p {
  font-size: 14px; line-height: 1.55;
  color: var(--ink-2);
}

/* ============== TECHNICAL TABLE BLOCK ============== */
.tech-block {
  background: #FBF9F2;
  border: 1px solid var(--rule);
  border-radius: 14px;
  overflow: hidden;
}
.tech-block-head {
  display: flex; justify-content: space-between; align-items: center;
  padding: 12px 18px;
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-mute);
}
.tech-block-head .tbh-r {
  color: var(--teal-deep);
  display: inline-flex; align-items: center; gap: 6px;
}
.tech-table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12.5px;
}
.tech-table tr + tr td { border-top: 1px solid var(--rule); }
.tech-table td {
  padding: 11px 18px;
  vertical-align: top;
}
.tech-table td:first-child {
  color: var(--ink-mute);
  font-size: 10.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  width: 38%;
  padding-top: 13px;
}
.tech-table td:last-child {
  color: var(--ink);
  font-weight: 500;
}

/* ============== MASTER KEY SECTION ============== */
.master-key { background: var(--bg-warm); }
.mk-grid {
  display: grid;
  grid-template-columns: 1fr 1.05fr;
  gap: 72px;
  align-items: center;
}
@media (max-width: 980px) { .mk-grid { grid-template-columns: 1fr; gap: 48px; } }

.mk-copy h2 {
  font-family: 'Instrument Serif', serif;
  font-size: clamp(36px, 4.4vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 18px 0 22px;
  text-wrap: balance;
}
.mk-copy h2 em { font-style: italic; color: var(--teal-deep); }
.mk-copy .lede {
  font-size: 17px; color: var(--ink-2); line-height: 1.6;
  margin-bottom: 24px; max-width: 520px;
}
.mk-context {
  margin-top: 18px;
  padding: 14px 16px;
  background: rgba(60,166,155,0.08);
  border-left: 2px solid var(--teal);
  border-radius: 0 8px 8px 0;
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 1.5;
}

/* Flow diagram */
.flow-card {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 18px;
  padding: 24px;
  box-shadow:
    0 30px 60px -30px rgba(20,21,24,0.18),
    0 8px 20px -10px rgba(20,21,24,0.06);
}
.flow-card-head {
  display: flex; justify-content: space-between; align-items: center;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--rule);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-mute);
}
.flow-card-head .fc-r {
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--teal-deep);
}
.flow-pipe {
  display: flex; flex-direction: column; gap: 6px;
  padding: 22px 0 18px;
}
.flow-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  align-items: center;
}
.flow-input {
  background: var(--bg);
  border: 1px solid var(--rule);
  border-radius: 9px;
  padding: 10px 12px;
}
.fi-l {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px; letter-spacing: 0.12em; text-transform: uppercase;
  color: var(--ink-mute);
}
.fi-v {
  font-size: 13px; color: var(--ink); margin-top: 4px;
  font-family: 'JetBrains Mono', monospace; letter-spacing: 0.02em;
}

.flow-arrow {
  display: flex; justify-content: center;
  padding: 4px 0;
  color: var(--teal-deep);
}

.flow-step {
  background: linear-gradient(160deg, var(--teal-soft) 0%, #fff 100%);
  border: 1px solid rgba(60,166,155,0.3);
  border-radius: 11px;
  padding: 12px 14px;
  display: grid;
  grid-template-columns: 30px 1fr auto;
  align-items: center;
  gap: 12px;
}
.flow-step.solid {
  background: linear-gradient(160deg, var(--ink) 0%, #25282E 100%);
  color: #ECE9DF;
  border-color: var(--ink);
}
.flow-step.solid .fs-l { color: #6FD4C9; }
.flow-step.solid .fs-v { color: #F4F1E8; }
.flow-step.solid .fs-num { background: rgba(60,166,155,0.2); color: #6FD4C9; }
.flow-step.final {
  background: linear-gradient(160deg, var(--teal) 0%, var(--teal-deep) 100%);
  border-color: var(--teal-deep);
  color: #0F1518;
}
.flow-step.final .fs-l { color: rgba(15,21,24,0.7); }
.flow-step.final .fs-v { color: #0F1518; font-weight: 600; }
.flow-step.final .fs-num { background: rgba(15,21,24,0.18); color: #0F1518; }

.fs-num {
  width: 26px; height: 26px; border-radius: 50%;
  background: rgba(60,166,155,0.18);
  color: var(--teal-deep);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; font-weight: 600;
}
.fs-l {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-mute);
}
.fs-v {
  font-size: 13px; color: var(--ink);
  font-family: 'JetBrains Mono', monospace; letter-spacing: 0.02em;
  margin-top: 2px;
}
.fs-tail {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; color: var(--ink-mute);
  letter-spacing: 0.04em;
}
.flow-step.solid .fs-tail { color: #B8B5AB; }

/* ============== VAULT ENCRYPTION ============== */
.vault-enc { background: var(--bg-soft); }
.ve-head {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: end;
  margin-bottom: 48px;
}
@media (max-width: 900px) { .ve-head { grid-template-columns: 1fr; gap: 24px; } }
.ve-head h2 {
  font-family: 'Instrument Serif', serif;
  font-size: clamp(36px, 4.4vw, 52px);
  line-height: 1.05;
  letter-spacing: -0.02em;
  margin: 18px 0 0;
  text-wrap: balance;
}
.ve-head h2 em { font-style: italic; color: var(--teal-deep); }
.ve-head p {
  font-size: 17px; color: var(--ink-2); line-height: 1.55;
  max-width: 520px;
}

.ve-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 32px;
  align-items: start;
}
@media (max-width: 900px) { .ve-grid { grid-template-columns: 1fr; } }

.enc-table {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 16px;
  overflow: hidden;
}
.enc-table-h {
  display: grid;
  grid-template-columns: 2fr 1.2fr 0.9fr;
  padding: 14px 22px;
  background: #FBF9F2;
  border-bottom: 1px solid var(--rule);
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-mute);
}
.enc-row {
  display: grid;
  grid-template-columns: 2fr 1.2fr 0.9fr;
  align-items: center;
  padding: 14px 22px;
  font-size: 13px;
  gap: 12px;
}
.enc-row + .enc-row { border-top: 1px solid var(--rule); }
.enc-row .er-d { color: var(--ink); font-weight: 500; }
.enc-row .er-a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  background: rgba(60,166,155,0.12);
  color: var(--teal-deep);
  padding: 3px 8px; border-radius: 5px;
  display: inline-block;
  letter-spacing: 0.02em;
}
.enc-row .er-k {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--ink-2);
  letter-spacing: 0.04em;
}

.ve-meta {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 16px;
  padding: 24px 26px;
  display: flex; flex-direction: column; gap: 16px;
}
.ve-meta-h {
  font-family: 'Instrument Serif', serif;
  font-size: 22px; line-height: 1.1;
  letter-spacing: -0.01em;
}
.ve-meta-list {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 12px;
}
.ve-meta-list li {
  display: grid; grid-template-columns: 14px 1fr;
  gap: 10px; align-items: flex-start;
  font-size: 13.5px; color: var(--ink-2);
  line-height: 1.5;
}
.ve-meta-list li::before {
  content: ''; width: 6px; height: 6px; border-radius: 50%;
  background: var(--ink-mute);
  margin-top: 8px;
}
.ve-meta-list li b {
  color: var(--ink); font-weight: 600;
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px;
}
.ve-note {
  margin-top: 4px;
  padding: 12px 14px;
  background: var(--bg-warm);
  border-radius: 8px;
  font-size: 12.5px;
  color: var(--ink-2);
  line-height: 1.5;
}

/* ============== SYNC SECTION (this page) ============== */
.sync-sec { background: var(--bg); }
.sync-sec-head { max-width: 720px; margin-bottom: 48px; }

.sync-diagram {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 24px;
  padding: 40px 28px 36px;
  margin-bottom: 40px;
  position: relative;
  overflow: hidden;
}
.sd-bloom {
  position: absolute;
  top: 30%; left: 50%;
  width: 600px; height: 320px;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse, var(--teal-glow), transparent 65%);
  pointer-events: none;
}
.sd-flow {
  position: relative;
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: 20px;
  align-items: center;
}
@media (max-width: 920px) {
  .sd-flow { grid-template-columns: 1fr; gap: 14px; }
  .sd-flow .sd-arrow { transform: rotate(90deg); justify-self: center; }
}

.sd-node {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 18px 18px 16px;
  display: flex; flex-direction: column; gap: 10px;
  text-align: center;
  position: relative;
  z-index: 1;
}
.sd-node.cipher {
  background: var(--ink);
  color: #ECE9DF;
  border-color: var(--ink);
}
.sd-node.cloud {
  background: linear-gradient(160deg, #fff 0%, #F0F4F8 100%);
  border-color: rgba(60,166,155,0.3);
}
.sd-node-ic {
  width: 38px; height: 38px; border-radius: 10px;
  background: var(--teal-soft); color: var(--teal-deep);
  display: inline-flex; align-items: center; justify-content: center;
  margin: 0 auto;
}
.sd-node.cipher .sd-node-ic { background: rgba(60,166,155,0.2); color: #6FD4C9; }
.sd-node-eyebrow {
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-mute);
}
.sd-node.cipher .sd-node-eyebrow { color: #6FD4C9; }
.sd-node-t {
  font-family: 'Instrument Serif', serif;
  font-size: 18px; line-height: 1.1; letter-spacing: -0.005em;
}
.sd-node.cipher .sd-node-t { color: #F4F1E8; }
.sd-node-s {
  font-size: 11px; color: var(--ink-mute);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.04em;
}
.sd-node.cipher .sd-node-s { color: #B8B5AB; }
.sd-cipher-blob {
  background: rgba(60,166,155,0.18);
  color: #6FD4C9;
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  padding: 6px 8px;
  border-radius: 6px;
  letter-spacing: 0.04em;
  word-break: break-all;
  line-height: 1.3;
  text-align: left;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.sd-arrow {
  display: flex; flex-direction: column; align-items: center; gap: 4px;
  color: var(--ink-mute);
  font-family: 'JetBrains Mono', monospace;
  font-size: 9px; letter-spacing: 0.1em;
}
.sd-arrow svg { color: var(--teal-deep); }
.sd-arrow-l { font-size: 9px; color: var(--ink-mute); }

.sync-points {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}
@media (max-width: 800px) { .sync-points { grid-template-columns: 1fr; } }
.sync-point {
  display: grid; grid-template-columns: 22px 1fr;
  gap: 12px; align-items: flex-start;
  font-size: 14px; color: var(--ink-2);
  line-height: 1.5;
}
.sync-point b { color: var(--ink); font-weight: 600; }

.trust-line {
  margin-top: 32px;
  padding: 22px 24px;
  background: var(--ink);
  color: #ECE9DF;
  border-radius: 14px;
  font-size: 16px; line-height: 1.55;
  text-wrap: pretty;
}
.trust-line b { color: #6FD4C9; font-weight: 500; }

/* ============== SHARING / ECIES ============== */
.share-sec { background: var(--bg-warm); }
.share-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 980px) { .share-grid { grid-template-columns: 1fr; gap: 48px; } }

.share-grid .lede {
  font-size: 17px; color: var(--ink-2); margin-bottom: 24px; line-height: 1.6;
}

.rotate-callout {
  margin-top: 20px;
  background: #fff;
  border: 1px solid var(--rule);
  border-left: 2px solid var(--teal);
  border-radius: 0 12px 12px 0;
  padding: 16px 18px;
  display: flex; flex-direction: column; gap: 8px;
}
.rc-h {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--teal-deep);
  display: inline-flex; align-items: center; gap: 8px;
}
.rc-b {
  font-size: 13.5px; color: var(--ink-2); line-height: 1.55;
}

/* ECIES diagram */
.ecies {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 18px;
  padding: 24px 22px;
  display: flex; flex-direction: column; gap: 14px;
  box-shadow:
    0 30px 60px -30px rgba(20,21,24,0.16),
    0 8px 20px -10px rgba(20,21,24,0.04);
}
.ecies-head {
  display: flex; justify-content: space-between; align-items: center;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-mute);
}
.ecies-head .eh-r { color: var(--teal-deep); }
.ecies-step {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 14px;
  align-items: flex-start;
}
.es-num {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--teal-soft);
  color: var(--teal-deep);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; font-weight: 600;
  flex-shrink: 0;
}
.es-body { display: flex; flex-direction: column; gap: 4px; }
.es-t {
  font-size: 13px; color: var(--ink); font-weight: 500;
}
.es-s {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-mute);
  letter-spacing: 0.02em;
}
.es-arrow {
  font-family: 'JetBrains Mono', monospace;
  color: var(--teal-deep);
}

.ecies-children {
  margin-left: 38px;
  padding-left: 14px;
  border-left: 1px dashed var(--rule-2);
  display: flex; flex-direction: column; gap: 8px;
}
.ecies-child {
  display: grid;
  grid-template-columns: 14px 1fr;
  gap: 10px; align-items: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-2);
  letter-spacing: 0.02em;
}
.ecies-child::before {
  content: '→'; color: var(--teal-deep);
}

/* ============== DEVICE LAYERS ============== */
.layers-sec { background: var(--bg); padding: 110px 0; }
.layers-head { max-width: 720px; margin-bottom: 48px; }

.layer-stack {
  display: flex; flex-direction: column; gap: 10px;
  max-width: 920px;
  margin: 0 auto;
}
.layer {
  display: grid;
  grid-template-columns: 100px 1fr;
  gap: 32px;
  align-items: stretch;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 16px;
  padding: 24px 28px 24px 24px;
  transition: transform 0.18s ease;
  position: relative;
}
@media (max-width: 700px) {
  .layer { grid-template-columns: 1fr; gap: 16px; padding: 22px 20px; }
}
.layer:hover { transform: translateX(4px); }

.layer-side {
  display: flex; flex-direction: column; gap: 12px;
  border-right: 1px solid var(--rule);
  padding-right: 24px;
}
@media (max-width: 700px) {
  .layer-side { border-right: 0; border-bottom: 1px solid var(--rule); padding-right: 0; padding-bottom: 14px; flex-direction: row; align-items: center; }
}
.layer-num {
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.16em;
  color: var(--ink-mute);
}
.layer-ic {
  width: 44px; height: 44px;
  border-radius: 11px;
  background: var(--teal-soft); color: var(--teal-deep);
  display: inline-flex; align-items: center; justify-content: center;
}

.layer-body { display: flex; flex-direction: column; gap: 12px; }
.layer-body h3 {
  font-family: 'Instrument Serif', serif;
  font-size: 26px; line-height: 1.05; letter-spacing: -0.015em;
}
.layer-feats {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 6px;
  font-size: 14px; color: var(--ink-2);
  line-height: 1.5;
}
.layer-feats li {
  position: relative; padding-left: 16px;
}
.layer-feats li::before {
  content: ''; position: absolute; left: 0; top: 9px;
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--teal);
}
.layer-feats li ul {
  list-style: none; padding: 6px 0 0 0; margin: 0;
  display: flex; flex-wrap: wrap; gap: 6px;
}
.layer-feats li ul li {
  padding: 0;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  background: var(--bg-warm);
  border-radius: 6px;
  padding: 3px 8px;
  letter-spacing: 0.02em;
  color: var(--ink-2);
}
.layer-feats li ul li::before { display: none; }

/* ============== PASSWORD CHANGE ============== */
.pwchange { background: var(--bg-soft); }
.pw-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 980px) { .pw-grid { grid-template-columns: 1fr; gap: 48px; } }

.pw-flow {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 18px;
  padding: 24px;
}
.pw-flow-h {
  display: flex; justify-content: space-between; align-items: center;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-mute);
}
.pw-steps {
  display: flex; flex-direction: column;
  gap: 8px;
  padding: 18px 0 0;
}
.pw-step {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 14px;
  padding: 12px;
  border-radius: 10px;
  background: var(--bg);
  border: 1px solid var(--rule);
  align-items: center;
}
.pw-step-n {
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--ink); color: var(--bg);
  display: inline-flex; align-items: center; justify-content: center;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; font-weight: 600;
}
.pw-step.complete .pw-step-n { background: var(--teal); color: #0F1518; }
.pw-step-t {
  font-size: 13.5px; color: var(--ink); line-height: 1.4;
}
.pw-step-t .mono {
  background: var(--bg-warm);
  padding: 1px 5px;
  border-radius: 3px;
  font-size: 11.5px;
  margin: 0 1px;
}

.pw-safety {
  margin-top: 14px;
  padding: 14px 16px;
  background: rgba(60,166,155,0.08);
  border-left: 2px solid var(--teal);
  border-radius: 0 8px 8px 0;
  font-size: 13px; color: var(--ink-2);
  line-height: 1.55;
}

.secret-key-card {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 18px;
  padding: 28px;
  display: flex; flex-direction: column; gap: 16px;
}
.secret-key-card h3 {
  font-family: 'Instrument Serif', serif;
  font-size: 26px; line-height: 1.05; letter-spacing: -0.015em;
}
.sk-format {
  background: linear-gradient(160deg, #1B1D20 0%, #0E1014 100%);
  color: #6FD4C9;
  padding: 22px 22px;
  border-radius: 12px;
  font-family: 'JetBrains Mono', monospace;
  font-size: clamp(15px, 2vw, 19px);
  letter-spacing: 0.16em;
  text-align: center;
  font-weight: 500;
  position: relative;
  overflow: hidden;
}
.sk-format::before {
  content: 'SECRET KEY'; position: absolute;
  top: 8px; left: 12px;
  font-size: 9px; letter-spacing: 0.16em;
  color: rgba(111,212,201,0.5);
}
.sk-format span.dim { color: rgba(111,212,201,0.4); }
.sk-desc {
  font-size: 14px; color: var(--ink-2); line-height: 1.55;
}

/* ============== ALGORITHM SUMMARY ============== */
.algo-sec { background: var(--bg-warm); }
.algo-sec .sec-head { margin-bottom: 40px; }

.algo-table {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 16px;
  overflow: hidden;
}
.algo-h, .algo-r {
  display: grid;
  grid-template-columns: 1.4fr 1.4fr 0.9fr 1fr;
  align-items: center;
  padding: 14px 24px;
  gap: 16px;
}
.algo-h {
  background: #FBF9F2;
  border-bottom: 1px solid var(--rule);
  font-family: 'JetBrains Mono', monospace;
  font-size: 9.5px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink-mute);
}
.algo-r {
  font-size: 13px;
}
.algo-r + .algo-r { border-top: 1px solid var(--rule); }
.algo-r .ar-c {
  color: var(--ink); font-weight: 500;
}
.algo-r .ar-a {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; color: var(--teal-deep);
}
.algo-r .ar-k {
  font-family: 'JetBrains Mono', monospace;
  font-size: 12px; color: var(--ink-2);
}
.algo-r .ar-s {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px; color: var(--ink-mute);
  letter-spacing: 0.04em;
}
@media (max-width: 800px) {
  .algo-h, .algo-r { grid-template-columns: 1fr 1fr; }
  .algo-h .ar-k, .algo-h .ar-s { display: none; }
  .algo-r .ar-k, .algo-r .ar-s { display: none; }
}

.algo-foot {
  margin-top: 20px;
  padding: 16px 20px;
  background: rgba(60,166,155,0.08);
  border-radius: 12px;
  font-size: 13.5px;
  color: var(--ink-2);
  line-height: 1.55;
  display: flex; align-items: flex-start; gap: 12px;
}
.algo-foot svg { color: var(--teal-deep); flex-shrink: 0; margin-top: 2px; }
.algo-foot b { color: var(--ink); }

/* ============== CANT DO / NEGATIVE SPACE ============== */
.cant-do {
  background: var(--night);
  color: #ECE9DF;
  padding: 120px 0;
  position: relative;
  overflow: hidden;
}
.cant-do .tc-bloom { background: radial-gradient(ellipse, rgba(60,166,155,0.18), transparent 65%); }
.cant-do .sec-head h2 { color: #F4F1E8; }
.cant-do .sec-head h2 em { color: #6FD4C9; }
.cant-do .sec-head p { color: #B8B5AB; }
.cant-do .eyebrow { color: #6FD4C9; }
.cant-do .eyebrow .dot { background: var(--teal); box-shadow: 0 0 0 3px rgba(60,166,155,0.3); }

.cant-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 8px;
  margin-bottom: 36px;
}
@media (max-width: 700px) { .cant-grid { grid-template-columns: 1fr; } }
.cant-row {
  display: grid;
  grid-template-columns: 32px 1fr;
  gap: 16px; align-items: center;
  padding: 18px 22px;
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 12px;
  font-size: 15px;
  color: #ECE9DF;
}
.cant-x {
  width: 28px; height: 28px; border-radius: 50%;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,0.15);
  color: #B8B5AB;
  display: inline-flex; align-items: center; justify-content: center;
}
.cant-close {
  position: relative;
  text-align: center;
  font-family: 'Instrument Serif', serif;
  font-size: clamp(22px, 2.6vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: #F4F1E8;
  text-wrap: balance;
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
}
.cant-close em { font-style: italic; color: #6FD4C9; }

/* ============== THREAT MODEL ============== */
.threat-sec { background: var(--bg-soft); }
.threat-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 40px;
}
@media (max-width: 800px) { .threat-grid { grid-template-columns: 1fr; } }

.threat-col {
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 18px;
  padding: 28px;
  display: flex; flex-direction: column; gap: 14px;
}
.threat-col.user-col {
  background: var(--bg-warm);
}
.threat-col-h {
  display: flex; align-items: center; gap: 12px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--rule);
}
.threat-ic {
  width: 36px; height: 36px; border-radius: 9px;
  background: var(--teal-soft); color: var(--teal-deep);
  display: inline-flex; align-items: center; justify-content: center;
}
.threat-col.user-col .threat-ic {
  background: var(--bg-soft); color: var(--ink-2);
}
.threat-col-t {
  font-family: 'Instrument Serif', serif;
  font-size: 22px; line-height: 1; letter-spacing: -0.01em;
}
.threat-list {
  list-style: none; padding: 0; margin: 0;
  display: flex; flex-direction: column; gap: 8px;
  font-size: 14px; color: var(--ink-2);
  line-height: 1.5;
}
.threat-list li {
  display: grid;
  grid-template-columns: 16px 1fr;
  gap: 10px; align-items: flex-start;
}
.threat-list li::before {
  content: '✓'; color: var(--teal-deep);
  font-size: 12px; font-weight: 700;
  margin-top: 2px;
}
.threat-col.user-col .threat-list li::before {
  content: '○'; color: var(--ink-mute); font-weight: 400;
  font-size: 13px; margin-top: 0;
}
.threat-list li b {
  font-family: 'JetBrains Mono', monospace;
  font-size: 11.5px;
  color: var(--ink-mute);
  letter-spacing: 0.02em;
  display: block;
  margin-top: 2px;
  font-weight: 500;
}

/* ============== FOOTER CTA on this page ============== */
.sec-footer-cta .fc-note {
  max-width: 640px;
  margin-left: auto; margin-right: auto;
  line-height: 1.7;
}