/* ============================================================
   Tri-Stone Trade Publications — shared stylesheet
   ============================================================ */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: "Georgia", "Times New Roman", serif;
  background-color: #f8f6f1;
  color: #2c2c2c;
  line-height: 1.75;
}

/* ---------- Colour tokens ---------- */
:root {
  --navy:      #1a2e45;
  --ocean:     #2b5f75;
  --sand:      #c9a96e;
  --light-bg:  #f8f6f1;
  --border:    #d8d0c0;
  --text:      #2c2c2c;
  --muted:     #5a5a5a;
  --white:     #ffffff;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  font-family: "Georgia", serif;
  color: var(--navy);
  line-height: 1.25;
}

h1 { font-size: 2.6rem; letter-spacing: -0.02em; }
h2 { font-size: 1.7rem; margin-bottom: 0.5rem; }
h3 { font-size: 1.2rem; margin-bottom: 0.35rem; }

p  { margin-bottom: 1rem; }
p:last-child { margin-bottom: 0; }

a  { color: var(--ocean); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ---------- Layout helpers ---------- */
.container {
  max-width: 860px;
  margin-inline: auto;
  padding-inline: 2rem;
}

section {
  padding-block: 4rem;
}

/* ---------- Navigation ---------- */
nav {
  background-color: var(--navy);
  position: sticky;
  top: 0;
  z-index: 100;
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: 1rem;
}

.nav-logo {
  font-size: 1.05rem;
  font-weight: normal;
  color: var(--sand);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: #ccd8e0;
  font-size: 0.9rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--sand);
  text-decoration: none;
}

/* ---------- Hero ---------- */
.hero {
  background-color: var(--navy);
  color: var(--white);
  padding-block: 6rem 5rem;
  border-bottom: 4px solid var(--sand);
}

.hero h1 {
  color: var(--white);
  font-size: 2.8rem;
  max-width: 640px;
  margin-bottom: 1.25rem;
}

.hero .tagline {
  font-style: italic;
  color: var(--sand);
  font-size: 1.2rem;
  margin-bottom: 1.75rem;
}

.hero .hero-body {
  color: #b8c8d4;
  font-size: 1rem;
  max-width: 580px;
  line-height: 1.85;
  margin-bottom: 0;
}

/* ---------- Intro list ---------- */
.intro-list {
  list-style: none;
  padding-left: 1.25rem;
  margin-bottom: 1rem;
  color: var(--text);
}

.intro-list li {
  margin-bottom: 0.4rem;
}

.intro-list li:last-child {
  margin-bottom: 0;
}
.intro {
  border-bottom: 1px solid var(--border);
}

.intro p {
  font-size: 1.05rem;
  color: var(--text);
  max-width: 720px;
}

.intro .intro-lead {
  font-size: 1.15rem;
  color: var(--navy);
  font-weight: normal;
  font-style: italic;
  margin-bottom: 1.5rem;
}

/* ---------- Focus areas ---------- */
.focus-areas {
  background-color: var(--white);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.focus-areas h2 {
  margin-bottom: 2.5rem;
}

.focus-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 2rem;
}

.focus-card {
  border-top: 3px solid var(--sand);
  padding-top: 1.25rem;
}

.focus-card h3 {
  color: var(--navy);
  margin-bottom: 0.5rem;
}

.focus-card p {
  color: var(--muted);
  font-size: 0.95rem;
}

/* ---------- Featured publication ---------- */
.featured-publication {
  background-color: var(--light-bg);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.featured-publication h2 {
  margin-bottom: 2rem;
}

.book-card {
  border-left: 4px solid var(--sand);
  background-color: var(--white);
  border: 1px solid var(--border);
  border-left: 4px solid var(--sand);
  padding: 1.75rem 2rem;
}

.book-info h3 {
  font-size: 1.3rem;
  margin-bottom: 0.75rem;
}

.book-info h3 a {
  color: var(--navy);
}

.book-info h3 a:hover {
  color: var(--ocean);
  text-decoration: underline;
}

.book-info p {
  color: var(--muted);
  font-size: 1rem;
  max-width: 680px;
  margin-bottom: 1.5rem;
}

/* ---------- Professional bridge ---------- */
.professional-bridge {
  background-color: #eef3f7;
  border-top: 1px solid #c8d8e4;
  border-bottom: 1px solid #c8d8e4;
}

.professional-bridge blockquote {
  border-left: 4px solid var(--ocean);
  padding-left: 1.5rem;
  color: var(--text);
  font-size: 1.05rem;
}

/* ---------- CTA / closing ---------- */
.cta-section {
  text-align: center;
}

.cta-section h2 {
  margin-bottom: 1rem;
}

.cta-section p {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: 2rem;
}

.btn {
  display: inline-block;
  background-color: var(--navy);
  color: var(--white);
  padding: 0.75rem 2rem;
  border-radius: 3px;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: background-color 0.2s;
  margin: 0.4rem;
}

.btn:hover {
  background-color: var(--ocean);
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--navy);
  color: var(--navy);
}

.btn-outline:hover {
  background-color: var(--navy);
  color: var(--white);
}

/* ---------- About page ---------- */
.about-hero {
  background-color: var(--navy);
  color: var(--white);
  padding-block: 4rem;
  border-bottom: 4px solid var(--sand);
}

.about-hero h1 {
  color: var(--white);
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
}

.about-hero .subtitle {
  color: var(--sand);
  font-style: italic;
  font-size: 1.05rem;
}

.about-content h2 {
  margin-top: 2.5rem;
  margin-bottom: 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 1px solid var(--border);
}

.about-content h2:first-child {
  margin-top: 0;
}

.about-content ul {
  list-style: none;
  padding-left: 0;
  margin-bottom: 1rem;
}

.about-content ul li::before {
  content: "— ";
  color: var(--ocean);
}

.name-origin {
  background-color: var(--white);
  border: 1px solid var(--border);
  border-left: 4px solid var(--sand);
  padding: 1.5rem 1.75rem;
  margin-block: 1.5rem;
  font-style: italic;
}

.name-origin .hanzi {
  font-size: 2.5rem;
  font-style: normal;
  display: block;
  margin-bottom: 0.5rem;
  color: var(--navy);
}

.consulting-box {
  background-color: #eef3f7;
  border: 1px solid #c8d8e4;
  padding: 1.75rem;
  margin-block: 1.5rem;
}

.consulting-box h3 {
  color: var(--ocean);
  margin-bottom: 0.75rem;
}

/* ---------- Footer ---------- */
footer {
  background-color: var(--navy);
  color: #8aa0b0;
  font-size: 0.85rem;
  padding-block: 2.5rem;
  margin-top: 0;
}

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

footer a {
  color: var(--sand);
}

footer a:hover {
  color: var(--white);
}

/* ---------- Responsive ---------- */
@media (max-width: 640px) {
  h1 { font-size: 2rem; }
  .hero { padding-block: 4rem 3.5rem; }
  .hero h1 { font-size: 2rem; }
  nav .container { flex-direction: column; gap: 0.75rem; align-items: flex-start; }
  .focus-grid { grid-template-columns: 1fr; }
  footer .container { flex-direction: column; align-items: flex-start; }
}