/* ============================================================
   SevenBridge Systems — main.css
   Dark, technical, minimal. One accent. Hairlines everywhere.
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Surfaces */
  --bg: #0a0b0d;
  --bg-raised: #0f1114;
  --bg-panel: #12151a;

  /* Ink */
  --text: #e8eaed;
  --text-dim: #9ba1a8;
  --text-faint: #5c6269;

  /* Structure */
  --hairline: rgba(232, 234, 237, 0.08);
  --hairline-strong: rgba(232, 234, 237, 0.16);

  /* Accent — single signal color, used sparingly */
  --accent: #5c9bff;
  --accent-dim: rgba(92, 155, 255, 0.35);
  --accent-faint: rgba(92, 155, 255, 0.08);

  /* Type */
  --font-sans: "Space Grotesk", system-ui, -apple-system, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, "SF Mono", monospace;

  /* Scale */
  --w-max: 1200px;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --section-pad: clamp(5rem, 12vh, 9rem);

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset / base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection {
  background: var(--accent);
  color: #0a0b0d;
}

img,
svg,
canvas {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

:focus-visible {
  outline: 1.5px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

/* ---------- Utilities ---------- */
.container {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* Mono eyebrow labels — "01 / Capabilities" */
.label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.label .tick {
  color: var(--accent);
}

/* ---------- Header ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s ease, background-color 0.4s ease;
}

.site-header.is-scrolled {
  background: rgba(10, 11, 13, 0.82);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom-color: var(--hairline);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

.brand svg {
  width: 42px;
  height: 29px;
  flex: none;
  color: var(--text);
}

.brand .brand-sub {
  color: var(--text-faint);
  font-weight: 400;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav a {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-dim);
  transition: color 0.2s ease;
}

.site-nav a:hover {
  color: var(--text);
}

.site-nav a[aria-current="page"]:not(.nav-cta) {
  color: var(--accent);
}

.site-nav a[aria-current="page"]:not(.nav-cta)::before {
  content: "● ";
  font-size: 0.6em;
  vertical-align: 0.15em;
}

.site-nav .nav-cta[aria-current="page"] {
  border-color: var(--accent-dim);
  background: var(--accent-faint);
  color: var(--accent);
}

.nav-cta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text);
  border: 1px solid var(--hairline-strong);
  padding: 0.55rem 1.1rem;
  border-radius: 2px;
  transition: border-color 0.2s ease, background-color 0.2s ease;
}

.nav-cta:hover {
  border-color: var(--accent-dim);
  background: var(--accent-faint);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1.5px;
  background: var(--text);
  transition: transform 0.3s var(--ease-out), opacity 0.2s ease;
}

@media (max-width: 760px) {
  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    inset: 4.25rem 0 auto 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--hairline);
    padding: 0.5rem var(--gutter) 1.5rem;
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s var(--ease-out), opacity 0.25s ease,
      visibility 0.25s;
  }

  .site-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .site-nav a {
    padding: 0.9rem 0;
    width: 100%;
    border-bottom: 1px solid var(--hairline);
  }

  .site-nav .nav-cta {
    border: none;
    padding: 0.9rem 0;
    color: var(--accent);
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(1) {
    transform: translateY(6.5px) rotate(45deg);
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(2) {
    opacity: 0;
  }

  .nav-toggle[aria-expanded="true"] span:nth-child(3) {
    transform: translateY(-6.5px) rotate(-45deg);
  }
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 6rem;
  padding-bottom: 4rem;
  overflow: hidden;
}

.hero-canvas {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-canvas canvas {
  width: 100%;
  height: 100%;
}

/* Soft vignette so text always wins over the canvas */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(
      ellipse 90% 70% at 30% 45%,
      rgba(10, 11, 13, 0.55) 0%,
      transparent 65%
    ),
    linear-gradient(to bottom, rgba(10, 11, 13, 0.4), transparent 30%,
      transparent 70%, var(--bg) 100%);
}

.hero .container {
  position: relative;
  z-index: 2;
}

.hero .label {
  margin-bottom: 2rem;
}

.hero h1 {
  font-size: clamp(2.6rem, 6.2vw, 5rem);
  font-weight: 500;
  line-height: 1.06;
  letter-spacing: -0.025em;
  max-width: 24ch;
  margin-bottom: 2rem;
}

.hero h1 em {
  font-style: normal;
  color: var(--text-dim);
}

.hero-sub {
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--text-dim);
  max-width: 52ch;
  margin-bottom: 3rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.hero-meta {
  position: absolute;
  z-index: 2;
  bottom: 2rem;
  left: 0;
  right: 0;
}

.hero-meta .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.hero-meta .label {
  color: var(--text-faint);
}

.scroll-hint {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.scroll-hint::after {
  content: "";
  display: block;
  width: 1px;
  height: 2.2rem;
  background: linear-gradient(to bottom, var(--text-faint), transparent);
  animation: hint-drop 2.4s var(--ease-out) infinite;
}

@keyframes hint-drop {
  0% {
    transform: scaleY(0);
    transform-origin: top;
  }
  45% {
    transform: scaleY(1);
    transform-origin: top;
  }
  55% {
    transform: scaleY(1);
    transform-origin: bottom;
  }
  100% {
    transform: scaleY(0);
    transform-origin: bottom;
  }
}

@media (prefers-reduced-motion: reduce) {
  .scroll-hint::after {
    animation: none;
  }
}

@media (max-width: 760px) {
  .hero-meta {
    display: none;
  }

  .hero {
    padding-bottom: 6rem;
  }
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.95rem 1.6rem;
  border: 1px solid var(--hairline-strong);
  border-radius: 2px;
  color: var(--text);
  transition: border-color 0.25s ease, background-color 0.25s ease,
    color 0.25s ease;
}

.btn .arrow {
  transition: transform 0.25s var(--ease-out);
}

.btn:hover .arrow {
  transform: translate(2px, -2px);
}

.btn-primary {
  background: var(--text);
  color: var(--bg);
  border-color: var(--text);
}

.btn-primary:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #06070a;
}

.btn-ghost:hover {
  border-color: var(--accent-dim);
  background: var(--accent-faint);
}

/* ---------- Sections ---------- */
.section {
  padding-block: var(--section-pad);
  border-top: 1px solid var(--hairline);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-end;
  gap: 1.5rem;
  margin-bottom: clamp(3rem, 7vh, 5rem);
}

.section-head h2 {
  font-size: clamp(1.9rem, 3.6vw, 2.9rem);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -0.02em;
  max-width: 22ch;
  margin-top: 1.25rem;
}

.section-head .head-note {
  font-size: 0.95rem;
  color: var(--text-dim);
  max-width: 38ch;
}

/* ---------- Capabilities list ---------- */
.cap-list {
  list-style: none;
  border-top: 1px solid var(--hairline);
}

.cap-row {
  border-bottom: 1px solid var(--hairline);
}

.cap-row > a,
.cap-row > .cap-inner {
  display: grid;
  grid-template-columns: 4rem 1fr 1.2fr;
  gap: clamp(1rem, 3vw, 3rem);
  align-items: baseline;
  padding: clamp(1.6rem, 3.5vh, 2.4rem) 0;
  transition: background-color 0.3s ease, padding-left 0.35s var(--ease-out);
}

.cap-row:hover > a,
.cap-row:hover > .cap-inner {
  background: linear-gradient(to right, var(--accent-faint), transparent 60%);
  padding-left: 1rem;
}

.cap-index {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-faint);
  transition: color 0.25s ease;
}

.cap-row:hover .cap-index {
  color: var(--accent);
}

.cap-title {
  font-size: clamp(1.35rem, 2.6vw, 1.9rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

.cap-desc {
  color: var(--text-dim);
  font-size: 0.95rem;
  max-width: 46ch;
}

.cap-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1rem;
  margin-top: 0.7rem;
}

.cap-tags span {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--text-faint);
}

.cap-tags span::before {
  content: "· ";
  color: var(--accent-dim);
}

@media (max-width: 760px) {
  .cap-row > a,
  .cap-row > .cap-inner {
    grid-template-columns: 2.6rem 1fr;
  }

  .cap-desc {
    grid-column: 2;
  }
}

/* ---------- Approach ---------- */
.phase-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  overflow: hidden;
}

.phase {
  padding: clamp(1.8rem, 3vw, 2.6rem);
  border-right: 1px solid var(--hairline);
  background: var(--bg-raised);
  position: relative;
}

.phase:last-child {
  border-right: none;
}

.phase .phase-num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.12em;
  display: block;
  margin-bottom: 2.6rem;
}

.phase h3 {
  font-size: 1.25rem;
  font-weight: 500;
  letter-spacing: -0.01em;
  margin-bottom: 0.8rem;
}

.phase p {
  color: var(--text-dim);
  font-size: 0.93rem;
}

@media (max-width: 860px) {
  .phase-grid {
    grid-template-columns: 1fr;
  }

  .phase {
    border-right: none;
    border-bottom: 1px solid var(--hairline);
  }

  .phase:last-child {
    border-bottom: none;
  }
}

/* ---------- Principles ---------- */
.principles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--hairline);
  border: 1px solid var(--hairline);
  border-radius: 3px;
  overflow: hidden;
}

.principle {
  background: var(--bg);
  padding: clamp(1.8rem, 3vw, 2.6rem);
  transition: background-color 0.3s ease;
}

.principle:hover {
  background: var(--bg-raised);
}

.principle .p-index {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-faint);
  display: block;
  margin-bottom: 1.4rem;
}

.principle h3 {
  font-size: 1.15rem;
  font-weight: 500;
  margin-bottom: 0.7rem;
}

.principle p {
  color: var(--text-dim);
  font-size: 0.93rem;
  max-width: 44ch;
}

@media (max-width: 760px) {
  .principles {
    grid-template-columns: 1fr;
  }
}

/* ---------- Engagement models ---------- */
.models {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(1.5rem, 3vw, 2.5rem);
}

.model {
  border-top: 1px solid var(--hairline-strong);
  padding-top: 1.6rem;
}

.model .label {
  margin-bottom: 1.2rem;
}

.model h3 {
  font-size: 1.3rem;
  font-weight: 500;
  margin-bottom: 0.7rem;
}

.model p {
  color: var(--text-dim);
  font-size: 0.93rem;
}

@media (max-width: 860px) {
  .models {
    grid-template-columns: 1fr;
  }
}

/* ---------- Contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: clamp(2.5rem, 6vw, 6rem);
  align-items: start;
}

.contact-grid h2 {
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-top: 1.25rem;
  margin-bottom: 1.5rem;
}

.contact-grid .contact-note {
  color: var(--text-dim);
  max-width: 40ch;
  margin-bottom: 2.5rem;
}

.contact-direct {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--text-dim);
}

.contact-direct a {
  color: var(--text);
  border-bottom: 1px solid var(--accent-dim);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.contact-direct a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

/* Form */
.contact-form {
  display: grid;
  gap: 1.4rem;
}

.field {
  display: grid;
  gap: 0.5rem;
}

.field label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-faint);
}

.field input,
.field select,
.field textarea {
  font: inherit;
  font-size: 0.95rem;
  color: var(--text);
  background: var(--bg-raised);
  border: 1px solid var(--hairline);
  border-radius: 2px;
  padding: 0.85rem 1rem;
  transition: border-color 0.2s ease, background-color 0.2s ease;
  width: 100%;
}

.field select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6' fill='none'%3E%3Cpath d='M1 1l4 4 4-4' stroke='%239ba1a8' stroke-width='1.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
}

.field textarea {
  min-height: 8.5rem;
  resize: vertical;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: none;
  border-color: var(--accent-dim);
  background: var(--bg-panel);
}

.field-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.4rem;
}

@media (max-width: 560px) {
  .field-row {
    grid-template-columns: 1fr;
  }
}

.form-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.form-hint {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
}

@media (max-width: 860px) {
  .contact-grid {
    grid-template-columns: 1fr;
  }
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--hairline);
  padding-block: 3rem 2.5rem;
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: flex-start;
  gap: 2rem;
  margin-bottom: 3rem;
}

.footer-nav {
  display: flex;
  gap: 2rem;
  flex-wrap: wrap;
}

.footer-nav a {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
  transition: color 0.2s ease;
}

.footer-nav a:hover {
  color: var(--text);
}

.footer-nav a[aria-current="page"] {
  color: var(--accent);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 1rem;
  border-top: 1px solid var(--hairline);
  padding-top: 1.8rem;
}

.footer-bottom p {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  max-width: 62ch;
}

.footer-bottom .koenigsberg em {
  font-style: italic;
  color: var(--text-dim);
}

/* ---------- Page (non-landing) headers ---------- */
.page-hero {
  padding-top: clamp(9rem, 20vh, 13rem);
  padding-bottom: clamp(3.5rem, 8vh, 6rem);
}

.page-hero h1 {
  font-size: clamp(2.4rem, 5.5vw, 4.2rem);
  font-weight: 500;
  line-height: 1.08;
  letter-spacing: -0.025em;
  max-width: 18ch;
  margin-top: 1.5rem;
}

.page-hero .page-sub {
  color: var(--text-dim);
  max-width: 54ch;
  margin-top: 1.5rem;
  font-size: 1.05rem;
}

/* ---------- Capability detail blocks (capabilities.html) ---------- */
.cap-detail {
  display: grid;
  grid-template-columns: 4rem 1fr 1.2fr;
  gap: clamp(1rem, 3vw, 3rem);
  padding-block: clamp(2.5rem, 6vh, 4rem);
  border-top: 1px solid var(--hairline);
}

.cap-detail:target {
  background: linear-gradient(to right, var(--accent-faint), transparent 55%);
}

.cap-detail h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
  font-weight: 500;
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.cap-detail .cap-lede {
  color: var(--text-dim);
  max-width: 44ch;
}

.cap-detail-body p {
  color: var(--text-dim);
  font-size: 0.95rem;
  margin-bottom: 1.2rem;
}

.cap-detail-body ul {
  list-style: none;
  display: grid;
  gap: 0.55rem;
  margin-top: 1.4rem;
}

.cap-detail-body li {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-dim);
  padding-left: 1.2rem;
  position: relative;
}

.cap-detail-body li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--accent-dim);
}

@media (max-width: 760px) {
  .cap-detail {
    grid-template-columns: 1fr;
    gap: 1.2rem;
  }
}

/* ---------- Prose (studio page) ---------- */
.prose {
  max-width: 64ch;
}

.prose p {
  color: var(--text-dim);
  margin-bottom: 1.4rem;
  font-size: 1.02rem;
}

.prose p strong {
  color: var(--text);
  font-weight: 500;
}

/* ---------- Reveal defaults (JS adds motion; no-JS stays visible) ---------- */
[data-reveal] {
  will-change: transform, opacity;
}

/* ============================================================
   Page identity — each page keys its accent off one of the four
   logo node colors. Home = bridge blue, Capabilities = sage,
   Studio = sand, Contact = steel.
   ============================================================ */
body[data-page="capabilities"] {
  --accent: #b7c99c;
  --accent-dim: rgba(183, 201, 156, 0.35);
  --accent-faint: rgba(183, 201, 156, 0.07);
}

body[data-page="studio"] {
  --accent: #d8c9ab;
  --accent-dim: rgba(216, 201, 171, 0.35);
  --accent-faint: rgba(216, 201, 171, 0.07);
}

body[data-page="contact"] {
  --accent: #a8c4da;
  --accent-dim: rgba(168, 196, 218, 0.35);
  --accent-faint: rgba(168, 196, 218, 0.08);
}

/* Sub-page hero: accent tint + ghosted company mark watermark */
.page-hero {
  position: relative;
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: radial-gradient(
    55% 90% at 78% 15%,
    var(--accent-faint),
    transparent 70%
  );
}

.page-hero::after {
  content: "";
  position: absolute;
  right: clamp(-6rem, -4vw, -2rem);
  top: 50%;
  transform: translateY(-46%);
  width: min(46vw, 580px);
  aspect-ratio: 297 / 203;
  background: url("../assets/logo_light.svg") no-repeat center / contain;
  opacity: 0.06;
  pointer-events: none;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

/* Mono breadcrumb path in page heroes */
.page-path .path-dim {
  color: var(--text-faint);
}

.page-path .path-here {
  color: var(--accent);
}

/* ---------- Section rail (fixed page index, desktop) ---------- */
.section-rail {
  position: fixed;
  right: 1.4rem;
  top: 50%;
  transform: translateY(-50%);
  z-index: 60;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.95rem;
}

.section-rail a {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-faint);
  transition: color 0.25s ease;
}

.section-rail a::after {
  content: "";
  width: 14px;
  height: 1px;
  background: currentColor;
  transition: width 0.3s var(--ease-out);
}

.section-rail a:hover {
  color: var(--text-dim);
}

.section-rail a.is-active {
  color: var(--accent);
}

.section-rail a.is-active::after {
  width: 26px;
}

@media (max-width: 1339px) {
  .section-rail {
    display: none;
  }
}

/* ---------- Ghost section numerals (parallaxed by JS) ---------- */
.section-head {
  position: relative;
}

.ghost-num {
  position: absolute;
  right: 0;
  top: -0.55em;
  font-size: clamp(5.5rem, 13vw, 10.5rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(232, 234, 237, 0.09);
  pointer-events: none;
  user-select: none;
}

@media (max-width: 760px) {
  .ghost-num {
    font-size: 4.5rem;
    top: -1.2em;
  }
}

/* ---------- Keyword marquee divider ---------- */
.marquee {
  overflow: hidden;
  border-top: 1px solid var(--hairline);
  padding-block: 1.15rem;
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee-scroll 36s linear infinite;
}

.marquee-group {
  display: flex;
  flex: none;
  align-items: center;
}

.marquee-group span {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-faint);
  white-space: nowrap;
  margin-right: 3.5rem;
}

.marquee-group span::after {
  content: "·";
  color: var(--accent-dim);
  margin-left: 3.5rem;
}

@keyframes marquee-scroll {
  to {
    transform: translateX(-50%);
  }
}

@media (prefers-reduced-motion: reduce) {
  .marquee-track {
    animation: none;
  }
}

/* ---------- Hero line-mask reveal ---------- */
.line {
  display: block;
  overflow: hidden;
}

.line-in {
  display: block;
  will-change: transform;
}

/* ---------- Approach connector line (drawn on scroll) ---------- */
.phase-grid {
  position: relative;
}

.phase-line {
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(to right, var(--accent), transparent 85%);
  transform: scaleX(0);
  transform-origin: left;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .phase-line {
    transform: scaleX(1);
  }
}

/* ---------- Raised panel sections (rhythm break) ---------- */
.section--panel {
  background: var(--bg-raised);
}

.section--panel .principle {
  background: var(--bg-raised);
}

.section--panel .principle:hover {
  background: var(--bg-panel);
}

/* ---------- Capability row hover arrow ---------- */
.cap-title::after {
  content: "↗";
  display: inline-block;
  margin-left: 0.55rem;
  font-size: 0.65em;
  color: var(--accent);
  opacity: 0;
  transform: translate(-8px, 8px);
  transition: opacity 0.3s ease, transform 0.35s var(--ease-out);
}

.cap-row:hover .cap-title::after {
  opacity: 1;
  transform: translate(0, 0);
}

/* ---------- Misc ---------- */
.skip-link {
  position: fixed;
  top: 0.75rem;
  left: 0.75rem;
  z-index: 200;
  background: var(--text);
  color: var(--bg);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.6rem 1rem;
  border-radius: 2px;
  transform: translateY(-200%);
  transition: transform 0.2s ease;
}

.skip-link:focus {
  transform: translateY(0);
}