/* Marshall — marshall.com.hk
   Single stylesheet. The site is served under a strict CSP (style-src 'self'),
   so there is no inline style anywhere and no external font: the system stacks
   below are the whole typographic palette. Colours are custom properties so the
   dark scheme can be expressed as a token swap rather than a second stylesheet. */

:root {
  /* Surfaces, lightest to deepest */
  --paper: #f7f4f0;
  --raised: #fffdfb;
  --sunken: #ebe5dd;
  --dark: #1b1614;
  --panel: #26201c;
  /* Ink */
  --ink: #1d1a18;
  --muted: #5d564f;
  --line: #ddd5ca;
  --line-strong: #8a8076;
  /* On the dark bands */
  --on-dark: #f6f0e9;
  --on-dark-soft: #cfc4b8;
  --on-dark-faint: #ab9d8f;
  --dark-line: #453a33;
  --dark-hit: #332a25;
  /* Accents, taken from the wordmark */
  --crimson: #902124;
  --crimson-deep: #6f1719;
  --crimson-lift: #b03a3d;
  /* Crimson as small text on the light bands, kept legible in both schemes. */
  --crimson-text: #902124;
  --brass: #bb9a61;
  --danger: #8d1f2c;
  --success: #1f6553;
  /* The wordmark is dark-on-transparent artwork, so in the dark scheme it sits
     on a light plate rather than being recoloured. */
  --wordmark-plate: transparent;
  --wordmark-plate-pad: 0;

  --max: 84rem;
  --radius: 6px;
  --serif: Charter, "Iowan Old Style", "Palatino Linotype", Cambria, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #141110;
    --raised: #1c1816;
    --sunken: #0f0d0c;
    --dark: #0b0a09;
    --panel: #181413;
    --ink: #f0eae3;
    --muted: #a99e93;
    --line: #322b26;
    --line-strong: #5b514a;
    --on-dark: #f3ede6;
    --on-dark-soft: #c6bbb0;
    --on-dark-faint: #9b8d80;
    --dark-line: #302925;
    --dark-hit: #241e1a;
    --crimson: #c14b4d;
    --crimson-deep: #a03a3c;
    --crimson-lift: #d97274;
    --crimson-text: #d6797b;
    --brass: #cdaf7c;
    --danger: #e0868e;
    --success: #6fbfa6;
    --wordmark-plate: #f2ece4;
    --wordmark-plate-pad: 0.3rem 0.55rem;
  }
}

/* ---------- base ---------- */
* { box-sizing: border-box }
html { scroll-behavior: smooth }
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.6 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { display: block; max-width: 100% }
a { color: inherit; text-decoration: none }
button, input, textarea { font: inherit }
h1, h2, h3 { font-family: var(--serif); font-weight: 500 }

.wrap { width: min(calc(100% - 2.5rem), var(--max)); margin-inline: auto }
.band { padding-block: clamp(4rem, 7.5vw, 6.5rem) }

.skip-link {
  position: fixed; left: 1rem; top: -4rem; z-index: 100;
  padding: .7rem 1rem;
  background: var(--raised); color: var(--crimson-text);
  border: 2px solid var(--crimson); border-radius: var(--radius);
}
.skip-link:focus { top: 1rem }
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible {
  outline: 3px solid var(--brass); outline-offset: 3px;
}

.eyebrow, .panel-label, .capability-index {
  margin: 0; color: var(--brass);
  font-size: .72rem; line-height: 1.3; font-weight: 800;
  text-transform: uppercase; letter-spacing: .14em;
}
.eyebrow-dark { color: var(--crimson-text) }

.button {
  display: inline-flex; align-items: center; justify-content: center;
  min-height: 2.85rem; padding: .65rem 1.25rem;
  border: 1px solid transparent; border-radius: var(--radius);
  cursor: pointer; font-weight: 700;
  transition: background-color .16s ease, border-color .16s ease, color .16s ease;
}
.button-primary { background: var(--crimson); color: #fff }
.button-primary:hover { background: var(--crimson-deep) }
.button-secondary { background: transparent; border-color: var(--on-dark-faint); color: var(--on-dark) }
.button-secondary:hover { border-color: var(--brass); color: #fff6e6 }

.text-link {
  display: inline-block; margin-top: 1.25rem;
  color: var(--brass); font-size: .85rem; font-weight: 700;
  border-bottom: 1px solid currentColor;
}

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 30;
  background: var(--raised);
  border-bottom: 1px solid var(--line);
}
.nav { min-height: 4.75rem; display: flex; align-items: center; justify-content: space-between; gap: 2rem }
.brand, .footer-brand {
  flex: 0 0 auto; display: inline-flex;
  background: var(--wordmark-plate); padding: var(--wordmark-plate-pad);
  border-radius: 4px;
}
.brand img { width: 12rem; height: auto }
.footer-brand { justify-self: start }
.footer-brand img { width: 11rem; height: auto }
.nav-links {
  display: flex; align-items: center; gap: 1.6rem;
  margin: 0; padding: 0; list-style: none;
  color: var(--muted); font-size: .92rem; font-weight: 650;
}
.nav-links a { padding: .4rem 0 }
.nav-links a:hover { color: var(--crimson-text) }
.nav-signin {
  display: inline-flex; align-items: center; min-height: 2.6rem;
  padding-inline: 1rem; color: #fff; background: var(--crimson-deep);
  border-radius: var(--radius);
}
.nav-signin:hover { color: #fff; background: var(--crimson) }
.menu-toggle {
  display: none; min-height: 2.75rem; padding: .55rem .85rem;
  border: 1px solid var(--line-strong); border-radius: var(--radius);
  background: var(--raised); color: var(--ink); font-weight: 700;
}

/* ---------- hero ---------- */
.hero { background: var(--dark); color: var(--on-dark); border-bottom: 3px solid var(--crimson) }
.hero-grid {
  display: grid;
  grid-template-columns: minmax(23rem, 1.1fr) minmax(19rem, 1fr) minmax(15rem, .74fr);
  align-items: center;
  gap: clamp(2rem, 3vw, 3.5rem);
  padding-block: clamp(3.5rem, 7vw, 6.5rem);
}
h1 {
  max-width: 13ch; margin: 1rem 0 1.5rem;
  font-size: clamp(2.9rem, 4.6vw, 4.3rem); line-height: 1;
}
h1 em { display: block; color: var(--brass); font-style: normal }
.hero-lede { max-width: 44ch; margin: 0; color: var(--on-dark-soft); font-size: clamp(1rem, 1.4vw, 1.14rem) }
.hero-actions { display: flex; flex-wrap: wrap; gap: .8rem; margin-top: 2rem }
.hero-assurance { margin: 2rem 0 0; color: var(--on-dark-faint); font-size: .84rem; max-width: 42ch }

.answer-extract, .source-ledger {
  min-width: 0; padding-left: clamp(1rem, 2vw, 2rem);
  border-left: 1px solid var(--dark-line);
}
.answer-extract p:not(.panel-label):not(.panel-note) {
  margin: 1.3rem 0 0; color: var(--on-dark); font: 1.02rem/1.66 var(--serif);
}
.panel-note { margin: 1.6rem 0 0; color: var(--on-dark-faint); font-size: .74rem; line-height: 1.5 }
.source-tag {
  display: inline-grid; place-items: center;
  width: 1.5rem; height: 1.5rem; margin-left: .4rem;
  border-radius: 50%; background: var(--crimson); color: #fff;
  font: 800 .7rem/1 var(--sans); vertical-align: .12em;
}
.source-tag:hover { background: var(--crimson-lift) }
.ledger-head { display: flex; justify-content: space-between; gap: 1rem; align-items: baseline }
.ledger-head span { color: var(--on-dark-faint); font-size: .78rem }
.source-ledger ol { margin: 1.4rem 0 0; padding: 0; list-style: none }
.source-ledger li {
  display: grid; grid-template-columns: 1.75rem 1fr; gap: .8rem;
  padding: 1rem 0; border-top: 1px solid var(--dark-line); scroll-margin-top: 6rem;
}
.source-ledger li:target { background: var(--dark-hit); margin-inline: -.65rem; padding-inline: .65rem }
.source-number {
  display: grid; place-items: center; width: 1.55rem; height: 1.55rem;
  border: 1px solid var(--brass); border-radius: 50%;
  color: var(--brass); font-size: .72rem; font-weight: 800;
}
.source-ledger strong, .source-ledger li div span { display: block }
.source-ledger strong { color: var(--on-dark); font-size: .86rem }
.source-ledger li div span { margin-top: .2rem; color: var(--on-dark-faint); font-size: .75rem; line-height: 1.45 }

/* ---------- shared section heading ---------- */
.section-heading { display: grid; grid-template-columns: .5fr 1.5fr; gap: 1rem 2rem; margin-bottom: 3rem }
.section-heading .eyebrow { grid-column: 1; grid-row: 1 }
.section-heading h2, .section-heading p:not(.eyebrow) { grid-column: 2 }
.section-heading h2 { margin: 0; font-size: clamp(2rem, 3.6vw, 3.4rem); line-height: 1.08 }
.section-heading p:not(.eyebrow) { margin: 0; max-width: 52ch; color: var(--muted) }

/* ---------- how it works ---------- */
.workflow { background: var(--raised) }
.workflow-list {
  display: grid; grid-template-columns: repeat(3, 1fr);
  margin: 0; padding: 0; list-style: none; border-block: 1px solid var(--line);
}
.workflow-list li { display: grid; grid-template-columns: 2.4rem 1fr; gap: 1rem; padding: 2rem 2rem 2rem 0 }
.workflow-list li + li { border-left: 1px solid var(--line); padding-left: 2rem }
.workflow-list > li > span { color: var(--crimson-text); font-weight: 800; font-size: .82rem }
.workflow-list h3 { margin: 0; font-size: 1.5rem; line-height: 1.2 }
.workflow-list p { margin: .75rem 0 0; color: var(--muted) }

/* ---------- research ---------- */
.capabilities { background: var(--sunken) }
.capabilities-layout { display: grid; grid-template-columns: .78fr 1.22fr; gap: clamp(2.5rem, 6vw, 6rem) }
.capabilities-copy { position: sticky; top: 7rem; align-self: start }
.capabilities-copy h2 { margin: 1rem 0 0; font-size: clamp(2rem, 3.6vw, 3.4rem); line-height: 1.08 }
.capabilities-copy > p:last-child { margin: 1.1rem 0 0; max-width: 42ch; color: var(--muted) }
.capability-list { border-top: 1px solid var(--line-strong) }
.capability-list article {
  display: grid; grid-template-columns: .42fr 1fr; column-gap: 2rem;
  padding-block: 2.25rem; border-bottom: 1px solid var(--line); scroll-margin-top: 6rem;
}
.capability-index { color: var(--crimson-text) }
.capability-list h3 { margin: 0; font-size: 1.45rem; line-height: 1.25 }
.capability-list article > p:last-child { grid-column: 2; margin: .65rem 0 0; color: var(--muted) }

/* ---------- matters ---------- */
.matters { background: var(--raised) }
.matters-layout { display: grid; grid-template-columns: 1.05fr 1fr; gap: clamp(2.5rem, 5vw, 4.5rem) }
.category-list { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line) }
.category-list li {
  padding: .8rem 0 .8rem 1.6rem; border-bottom: 1px solid var(--line);
  position: relative; font-weight: 650;
}
.category-list li::before {
  content: ""; position: absolute; left: 0; top: 1.35rem;
  width: .5rem; height: .5rem; border: 1px solid var(--crimson-text); border-radius: 50%;
}
.matters-content { min-width: 0 }
.matters-note { margin: 1.5rem 0 0; max-width: 46ch; color: var(--muted) }
.matters-image { border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; min-height: 22rem }
.matters-image img { width: 100%; height: 100%; object-fit: cover }

/* ---------- work product ---------- */
.work { background: var(--sunken) }
.tools-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line) }
.tools-list article { background: var(--sunken); padding: 2rem }
.tools-list::after { content: ""; background: var(--sunken) }
.tools-list h3 { margin: 0; font-size: 1.3rem; line-height: 1.25 }
.tools-list p { margin: .7rem 0 0; color: var(--muted); font-size: .95rem }

/* ---------- security ---------- */
.security { background: var(--panel); color: var(--on-dark) }
.security-layout { display: grid; grid-template-columns: .78fr 1.22fr; gap: clamp(2.5rem, 6vw, 6rem) }
.security h2 { margin: 1rem 0 0; font-size: clamp(2rem, 3.6vw, 3.4rem); line-height: 1.08 }
.security-list { display: grid; grid-template-columns: 1fr 1fr; margin: 0; border-top: 1px solid var(--dark-line) }
.security-list div { padding: 1.6rem 1.5rem 1.6rem 0; border-bottom: 1px solid var(--dark-line) }
.security-list div:nth-child(even) { padding-left: 1.5rem; border-left: 1px solid var(--dark-line) }
.security-list dt { color: var(--on-dark); font-weight: 800 }
.security-list dd { margin: .55rem 0 0; color: var(--on-dark-soft); font-size: .9rem }

/* ---------- request access ---------- */
.signup { background: var(--paper) }
.signup-layout { display: grid; grid-template-columns: .8fr 1.2fr; gap: clamp(2.5rem, 6vw, 6rem); align-items: start }
.signup-copy h2 { margin: 1rem 0 0; font-size: clamp(2rem, 3.6vw, 3.4rem); line-height: 1.08 }
.signup-copy > p:not(.eyebrow) { margin: 1.1rem 0 0; max-width: 45ch; color: var(--muted) }
.privacy-note { padding-top: 1rem; border-top: 1px solid var(--line); color: var(--ink); font-weight: 700 }
.signup-form {
  padding: clamp(1.5rem, 3vw, 2.25rem);
  background: var(--raised); border: 1px solid var(--line); border-radius: var(--radius);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem }
.field { display: grid; gap: .4rem }
.field-wide { grid-column: 1 / -1 }
.field label { color: var(--ink); font-size: .86rem; font-weight: 700 }
.field label span { color: var(--muted); font-weight: 400 }
.field input, .field textarea {
  width: 100%; padding: .72rem .8rem;
  border: 1px solid var(--line-strong); border-radius: 4px;
  background: var(--paper); color: var(--ink);
}
.field textarea { resize: vertical; min-height: 7rem }
.signup-form > .button { margin-top: 1rem }
.signup-form > .button:disabled { opacity: .6; cursor: wait }
.trap { position: absolute; width: 1px; height: 1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap }
.form-status { margin: 1rem 0 0; font-weight: 650 }
.form-status-success { color: var(--success) }
.form-status-error { color: var(--danger) }

/* ---------- footer ---------- */
.site-footer { background: var(--raised); border-top: 1px solid var(--line) }
.footer-top { min-height: 9rem; display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: center; gap: 2rem }
.footer-top p { margin: 0; color: var(--muted) }
.footer-top nav { display: flex; justify-content: flex-end; flex-wrap: wrap; gap: 1rem; font-size: .86rem; font-weight: 700 }
.footer-top nav a:hover { color: var(--crimson-text) }
.footer-bottom {
  display: flex; justify-content: space-between; gap: 1rem;
  padding-block: 1rem; border-top: 1px solid var(--line);
  color: var(--muted); font-size: .76rem;
}

/* ---------- responsive ---------- */
@media (max-width: 1180px) {
  .hero-grid { grid-template-columns: 1fr 1fr }
  .hero-intro { grid-column: 1 / -1; max-width: 46rem }
  .capabilities-layout, .security-layout, .signup-layout, .matters-layout { grid-template-columns: 1fr }
  .capabilities-copy { position: static; max-width: 48rem }
  .tools-list { grid-template-columns: repeat(2, 1fr) }
}
@media (max-width: 800px) {
  .wrap { width: min(calc(100% - 2rem), var(--max)) }
  .menu-toggle { display: inline-flex }
  .nav-links {
    position: absolute; top: calc(100% + .5rem); right: 1rem;
    width: min(19rem, calc(100vw - 2rem));
    display: grid; gap: 0; padding: .6rem;
    background: var(--raised); border: 1px solid var(--line); border-radius: var(--radius);
    opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(-.5rem);
    transition: opacity .16s ease, transform .16s ease, visibility .16s ease;
  }
  .nav-links.is-open { opacity: 1; visibility: visible; pointer-events: auto; transform: none }
  .nav-links a { display: block; padding: .75rem }
  .nav-signin { margin-top: .35rem }
  .hero-grid { grid-template-columns: 1fr; padding-block: 3.5rem }
  .hero-intro { grid-column: auto }
  .answer-extract, .source-ledger { padding-left: 0; padding-top: 2rem; border-left: 0; border-top: 1px solid var(--dark-line) }
  .section-heading { grid-template-columns: 1fr }
  .section-heading h2, .section-heading p:not(.eyebrow) { grid-column: 1 }
  .workflow-list { grid-template-columns: 1fr }
  .workflow-list li { padding: 1.5rem 0 }
  .workflow-list li + li { padding-left: 0; border-left: 0; border-top: 1px solid var(--line) }
  .security-list { grid-template-columns: 1fr }
  .security-list div:nth-child(even) { padding-left: 0; border-left: 0 }
  .footer-top { grid-template-columns: 1fr; padding-block: 2rem; gap: 1rem }
  .footer-top nav { justify-content: flex-start }
}
@media (max-width: 560px) {
  .brand img { width: 10rem }
  h1 { font-size: clamp(2.4rem, 11vw, 3.4rem) }
  .hero-actions { display: grid }
  .hero-actions .button { width: 100% }
  .capability-list article { grid-template-columns: 1fr; gap: .6rem }
  .capability-list article > p:last-child { grid-column: 1 }
  .tools-list { grid-template-columns: 1fr }
  .tools-list::after { display: none }
  .tools-list article { padding: 1.5rem }
  .matters-image { min-height: 16rem }
  .form-grid { grid-template-columns: 1fr }
  .field-wide { grid-column: auto }
  .signup-form > .button { width: 100% }
  .footer-bottom { display: grid }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto }
  *, *::before, *::after { transition-duration: .01ms !important }
}