/* ==========================================================================
   Anglo Siam Advisory — Site Stylesheet
   Design system: warm off-white ground, deep advisory blue + muted bronze
   accents, double-serif type pairing (Fraunces display / Merriweather body)
   with an Inter utility face for navigation, labels and data.
   Signature motif: "the ledger rule" — a thin double rule with a small
   bronze eyebrow label opens each major section, echoing a structured
   report. Hero uses a faint contour-line pattern (survey/map reference,
   not a tropical cliche) as a CSS fallback background.
   ========================================================================== */

/* ---- Design tokens ---- */
:root {
  /* Colour */
  --color-bg: #F6F1E7;
  --color-bg-alt: #EEE6D6;
  --color-surface: #FFFFFF;
  --color-surface-tint: #FBF8F1;
  --color-text: #1C2430;
  --color-text-muted: #545F6E;
  --color-primary: #1F3A5C;
  --color-primary-dark: #142639;
  --color-accent: #A9793C;
  --color-accent-light: #C9A363;
  --color-border: #DED2B8;
  --color-border-strong: #C9B892;

  /* Type */
  --font-display: "Fraunces", Georgia, "Times New Roman", serif;
  --font-body: "Merriweather", Georgia, "Times New Roman", serif;
  --font-utility: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Scale */
  --step--1: clamp(0.85rem, 0.82rem + 0.15vw, 0.95rem);
  --step-0: clamp(1rem, 0.96rem + 0.2vw, 1.1rem);
  --step-1: clamp(1.2rem, 1.1rem + 0.4vw, 1.4rem);
  --step-2: clamp(1.5rem, 1.35rem + 0.6vw, 1.85rem);
  --step-3: clamp(1.9rem, 1.65rem + 1vw, 2.5rem);
  --step-4: clamp(2.4rem, 2rem + 1.8vw, 3.4rem);

  /* Layout */
  --content-width: 1140px;
  --radius-sm: 3px;
  --radius-md: 6px;
  --space-section: clamp(3.5rem, 3rem + 2.5vw, 6rem);
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: var(--step-0);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: var(--color-primary); }
ul { padding-left: 1.2em; }
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

/* ---- Typography ---- */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  color: var(--color-primary-dark);
  line-height: 1.15;
  margin: 0 0 0.5em;
  font-weight: 600;
}
h1 { font-size: var(--step-4); font-weight: 700; }
h2 { font-size: var(--step-3); }
h3 { font-size: var(--step-2); }
h4 { font-size: var(--step-1); font-family: var(--font-utility); font-weight: 600; }
p { margin: 0 0 1.1em; }
.lede {
  font-size: var(--step-1);
  color: var(--color-text-muted);
  max-width: 42em;
}
.eyebrow {
  font-family: var(--font-utility);
  font-size: var(--step--1);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  display: block;
  margin-bottom: 0.9em;
}

/* ---- Signature motif: the ledger rule ---- */
.ledger-rule {
  display: flex;
  align-items: center;
  gap: 0.9em;
  margin-bottom: 1.4em;
}
.ledger-rule::before {
  content: "";
  width: 34px;
  height: 3px;
  background: var(--color-accent);
  flex: none;
}
.ledger-rule .eyebrow { margin: 0; }
.section-head { margin-bottom: 2.6rem; }
.section-head h2 { margin-bottom: 0.4em; }

/* ---- Layout helpers ---- */
.wrap {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}
.section { padding: var(--space-section) 0; }
.section-alt { background: var(--color-bg-alt); }
.section-dark {
  background: var(--color-primary-dark);
  color: #EDE7D8;
}
.section-dark h2, .section-dark h3, .section-dark h4 { color: #FFFFFF; }
.section-dark .eyebrow { color: var(--color-accent-light); }
.grid {
  display: grid;
  gap: 1.75rem;
}
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 640px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}

/* ---- Buttons ---- */
.btn {
  font-family: var(--font-utility);
  font-weight: 600;
  font-size: var(--step--1);
  letter-spacing: 0.02em;
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.85em 1.6em;
  border-radius: var(--radius-sm);
  text-decoration: none;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}
.btn-primary {
  background: var(--color-primary);
  color: #FFFFFF;
}
.btn-primary:hover { background: var(--color-primary-dark); }
.btn-ghost {
  background: transparent;
  color: var(--color-primary-dark);
  border-color: var(--color-border-strong);
}
.btn-ghost:hover { border-color: var(--color-primary); background: rgba(31,58,92,0.05); }
.section-dark .btn-ghost { color: #FFFFFF; border-color: rgba(255,255,255,0.35); }
.section-dark .btn-ghost:hover { border-color: #FFFFFF; background: rgba(255,255,255,0.08); }
.btn-row { display: flex; gap: 1rem; flex-wrap: wrap; margin-top: 1.8rem; }

/* ---- Header / Nav ---- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  background: rgba(246, 241, 231, 0.94);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 1.5rem;
  max-width: var(--content-width);
  margin: 0 auto;
}
.brand {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-primary-dark);
  text-decoration: none;
  letter-spacing: 0.01em;
}
.brand span { color: var(--color-accent); }
.main-nav ul {
  list-style: none;
  display: flex;
  gap: 2.1rem;
  margin: 0;
  padding: 0;
  align-items: center;
}
.main-nav a {
  font-family: var(--font-utility);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text);
  text-decoration: none;
  padding: 0.3em 0.1em;
  border-bottom: 2px solid transparent;
}
.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-primary-dark);
  border-bottom-color: var(--color-accent);
}
.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  padding: 0.5em 0.7em;
  cursor: pointer;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--color-primary-dark);
  position: relative;
  transition: transform 0.15s ease;
}
.nav-toggle span::before,
.nav-toggle span::after { content: ""; position: absolute; left: 0; }
.nav-toggle span::before { top: -6px; }
.nav-toggle span::after { top: 6px; }

@media (max-width: 860px) {
  .nav-toggle { display: inline-flex; align-items: center; }
  .main-nav {
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    display: none;
  }
  .main-nav.is-open { display: block; }
  .main-nav ul { flex-direction: column; align-items: flex-start; gap: 0; padding: 0.5rem 1.5rem 1.5rem; }
  .main-nav li { width: 100%; }
  .main-nav a { display: block; padding: 0.7em 0; }
  .header-cta { display: none; }
}

/* ---- Hero ---- */
.hero {
  position: relative;
  overflow: hidden;
  padding: clamp(3.5rem, 4vw + 2rem, 7rem) 0;
  background:
    linear-gradient(180deg, rgba(246,241,231,0.4), rgba(246,241,231,0.96) 78%),
    var(--color-bg);
}
/* Fallback contour-line pattern — swap for hero-background.jpg via .hero--photo (see comments in index.html) */
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.5;
  background-image:
    repeating-radial-gradient(circle at 82% 20%, transparent 0, transparent 42px, rgba(31,58,92,0.055) 43px, rgba(31,58,92,0.055) 44px, transparent 45px, transparent 88px),
    repeating-radial-gradient(circle at 82% 20%, transparent 0, transparent 100px, rgba(169,121,60,0.07) 101px, rgba(169,121,60,0.07) 102px, transparent 103px, transparent 176px);
  background-size: 100% 100%;
}
/* Optional real-photo variant: add class "hero--photo" to <section class="hero">
   and place hero-background.jpg in assets/images/ to activate it. */
.hero--photo::before { display: none; }
.hero--photo {
  background:
    linear-gradient(180deg, rgba(20,38,57,0.55), rgba(20,38,57,0.72)),
    url('assets/images/hero-background.jpg') center/cover no-repeat;
}
.hero--photo .eyebrow,
.hero--photo h1,
.hero--photo .lede,
.hero--photo .support-text { color: #FFFFFF; }
.hero--photo .trust-line { color: rgba(255,255,255,0.75); border-top-color: rgba(255,255,255,0.25); }
.hero .wrap { position: relative; z-index: 1; }
.hero-inner { max-width: 42em; }
.hero .eyebrow { color: var(--color-accent); }
.hero h1 { margin-bottom: 0.45em; }
.hero .lede { font-size: var(--step-1); color: var(--color-text); margin-bottom: 0.7em; }
.hero .support-text { color: var(--color-text-muted); max-width: 40em; }
.trust-line {
  margin-top: 2.2rem;
  padding-top: 1.4rem;
  border-top: 1px solid var(--color-border);
  font-family: var(--font-utility);
  font-size: var(--step--1);
  color: var(--color-text-muted);
  max-width: 34em;
}

/* Image band with gradient fallback — use on elements with class .image-slot */
.image-slot {
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  position: relative;
  overflow: hidden;
  color: rgba(255,255,255,0.65);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-utility);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  text-align: center;
  min-height: 220px;
}
.image-slot::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: repeating-linear-gradient(135deg, rgba(255,255,255,0.05) 0 2px, transparent 2px 26px);
}
.image-slot span { position: relative; z-index: 2; padding: 1rem; display: none; }
.image-slot img {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---- Cards ---- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 1.9rem;
}
.card h3, .card h4 { margin-bottom: 0.4em; }
.card p:last-child { margin-bottom: 0; }
.card-muted {
  background: var(--color-surface-tint);
  border-style: dashed;
}

/* ---- Problem section paragraphs ---- */
.problem-copy { max-width: 46em; }
.problem-copy p { font-size: var(--step-0); }
.problem-copy p:last-of-type {
  font-weight: 600;
  color: var(--color-primary-dark);
  font-family: var(--font-utility);
  font-size: var(--step--1);
  letter-spacing: 0.01em;
}

/* ---- Who ASA is for: bullet cards ---- */
.who-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 1rem; grid-template-columns: repeat(2, 1fr); }
@media (max-width: 640px) { .who-list { grid-template-columns: 1fr; } }
.who-list li {
  display: flex;
  gap: 0.8em;
  align-items: flex-start;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  font-family: var(--font-utility);
  font-size: 0.95rem;
}
.who-list li::before {
  content: "";
  flex: none;
  width: 8px; height: 8px;
  margin-top: 0.4em;
  background: var(--color-accent);
  border-radius: 50%;
}

/* ---- Process steps ---- */
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; counter-reset: step; }
@media (max-width: 900px) { .steps { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 560px) { .steps { grid-template-columns: 1fr; } }
.step { position: relative; padding-top: 2.2rem; border-top: 3px solid var(--color-accent); }
.step-number {
  font-family: var(--font-display);
  font-size: 1.6rem;
  color: var(--color-accent);
  display: block;
  margin-bottom: 0.4rem;
}

/* ---- Credibility blocks ---- */
.credibility { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.75rem; margin-top: 2rem; }
@media (max-width: 780px) { .credibility { grid-template-columns: 1fr; } }
.credibility-block h4 { font-family: var(--font-utility); font-size: 1rem; }

/* ---- Final CTA band ---- */
.cta-band { text-align: left; }
.cta-band .wrap { max-width: 46em; }
.cta-band h2 { color: #FFFFFF; }

/* ---- Services page: groups & accordion ---- */
.service-groups { display: flex; flex-direction: column; gap: 1.1rem; }
.service-group {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  overflow: hidden;
}
.service-group summary {
  list-style: none;
  cursor: pointer;
  padding: 1.4rem 1.7rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-display);
  font-size: var(--step-2);
  color: var(--color-primary-dark);
}
.service-group summary::-webkit-details-marker { display: none; }
.service-group summary .group-index {
  font-family: var(--font-utility);
  font-size: var(--step--1);
  color: var(--color-accent);
  font-weight: 600;
  letter-spacing: 0.1em;
  margin-right: 0.9rem;
}
.summary-icon {
  flex: none;
  width: 28px; height: 28px;
  border: 1.5px solid var(--color-border-strong);
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-family: var(--font-utility);
  color: var(--color-primary);
  transition: transform 0.15s ease;
}
.service-group[open] .summary-icon { transform: rotate(45deg); }
.service-group-body {
  padding: 0 1.7rem 1.8rem;
  border-top: 1px solid var(--color-border);
}
.service-group-intro {
  color: var(--color-text-muted);
  padding-top: 1.4rem;
  max-width: 42em;
}
.service-list { display: grid; gap: 1.4rem; grid-template-columns: repeat(2, 1fr); margin-top: 0.6rem; }
@media (max-width: 780px) { .service-list { grid-template-columns: 1fr; } }
.service-item {
  background: var(--color-surface-tint);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 1.4rem 1.5rem;
}
.service-item.is-light {
  background: transparent;
  border-style: dashed;
}
.service-item .best-for {
  font-family: var(--font-utility);
  font-size: 0.82rem;
  color: var(--color-accent);
  font-weight: 600;
  display: block;
  margin-bottom: 0.5em;
}
.service-item .typical-output {
  font-family: var(--font-utility);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  border-top: 1px dashed var(--color-border-strong);
  margin-top: 0.9em;
  padding-top: 0.7em;
}

/* ---- Insights page ---- */
.case-label {
  display: inline-block;
  font-family: var(--font-utility);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary-dark);
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border-strong);
  padding: 0.25em 0.7em;
  border-radius: 999px;
  margin-bottom: 0.9em;
}
.case-card { display: grid; gap: 1.5rem; grid-template-columns: 1.1fr 1.5fr; padding: 2.2rem; }
@media (max-width: 860px) { .case-card { grid-template-columns: 1fr; } }
.case-card + .case-card { margin-top: 1.6rem; }
.case-media .image-slot { min-height: 100%; }
.case-body h3 { margin-bottom: 0.3em; }
.case-context { color: var(--color-text-muted); font-style: italic; }
.case-sub { font-family: var(--font-utility); font-weight: 700; font-size: 0.85rem; letter-spacing: 0.03em; color: var(--color-primary-dark); margin: 1.1em 0 0.4em; text-transform: uppercase; }
.case-body ul { margin: 0.2em 0 0; }
.case-body ul li { margin-bottom: 0.3em; }

.notes-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; margin-top: 0.5rem; }
@media (max-width: 860px) { .notes-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 600px) { .notes-grid { grid-template-columns: 1fr; } }
.note-card { display: flex; flex-direction: column; gap: 0.8rem; }
.note-card .note-date { font-family: var(--font-utility); font-size: 0.78rem; color: var(--color-text-muted); }
.note-card.is-placeholder {
  align-items: flex-start;
  justify-content: center;
  min-height: 180px;
  color: var(--color-text-muted);
  font-family: var(--font-utility);
  font-size: 0.9rem;
}

/* ---- Contact page ---- */
.contact-layout { display: grid; grid-template-columns: 1fr 1.3fr; gap: 3rem; align-items: start; }
@media (max-width: 900px) { .contact-layout { grid-template-columns: 1fr; } }
.contact-aside .card { margin-bottom: 1.2rem; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.1rem 1.3rem; }
@media (max-width: 600px) { .form-grid { grid-template-columns: 1fr; } }
.field { display: flex; flex-direction: column; gap: 0.4em; }
.field.full { grid-column: 1 / -1; }
.field label {
  font-family: var(--font-utility);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-primary-dark);
}
.field input,
.field select,
.field textarea {
  font-family: var(--font-body);
  font-size: 0.98rem;
  padding: 0.7em 0.85em;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
}
.field textarea { resize: vertical; min-height: 120px; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
  border-color: var(--color-accent);
}
.form-note {
  font-family: var(--font-utility);
  font-size: 0.82rem;
  color: var(--color-text-muted);
  margin-top: 1.2rem;
}
.disclaimer-box {
  border-left: 3px solid var(--color-accent);
  padding: 1rem 1.3rem;
  background: var(--color-surface-tint);
  font-size: 0.92rem;
  color: var(--color-text-muted);
}

/* ---- Footer ---- */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(237, 231, 216, 0.85);
  padding: 3.5rem 0 2rem;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 2.5rem;
  padding-bottom: 2.2rem;
  border-bottom: 1px solid rgba(255,255,255,0.14);
}
@media (max-width: 780px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-brand {
  font-family: var(--font-display);
  font-size: 1.2rem;
  color: #FFFFFF;
  margin-bottom: 0.5em;
}
.footer-tagline { max-width: 30em; color: rgba(237,231,216,0.7); }
.footer-col h4 {
  font-family: var(--font-utility);
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-light);
  margin-bottom: 0.9em;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 0.55em; }
.footer-col a { color: rgba(237,231,216,0.85); text-decoration: none; font-size: 0.95rem; }
.footer-col a:hover { color: #FFFFFF; text-decoration: underline; }
.footer-bottom {
  padding-top: 1.6rem;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
  font-family: var(--font-utility);
  font-size: 0.8rem;
  color: rgba(237,231,216,0.6);
}
.footer-disclaimer { max-width: 46em; }

/* ---- Skip link ---- */
.skip-link {
  position: absolute;
  left: -999px;
  top: auto;
  background: var(--color-primary);
  color: #fff;
  padding: 0.8em 1.2em;
  z-index: 100;
}
.skip-link:focus { left: 1rem; top: 1rem; }