/* ============================================
   RCB GLOBAL — rcbglobal.org
   Robinson College of Business · GSU
   Premium Dark · Bloomberg/EIU Aesthetic
   ============================================ */

/* --- Design Tokens --- */
:root {
  /* Palette — warm charcoal, not pure black. Gold accent, not teal. */
  --ink: #0c0c0e;
  --surface: #141416;
  --raised: #1c1c20;
  --border: rgba(255,255,255,0.07);
  --border-hover: rgba(255,255,255,0.15);
  --text-primary: #e8e6e3;
  --text-secondary: #9a9590;
  --text-dim: #5c5854;
  --accent: #c9a84c;           /* Muted gold — institutional, not SaaS */
  --accent-subtle: rgba(201,168,76,0.12);
  --blue: #3d6baa;             /* GSU blue, desaturated */
  --blue-subtle: rgba(61,107,170,0.10);

  /* Region colors — for country cards */
  --region-north: #c9a84c;
  --region-west: #7c9a5e;
  --region-east: #6b8db5;
  --region-south: #b07a5b;

  /* Typography — serif headings for authority */
  --font-heading: 'Playfair Display', Georgia, 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', monospace;

  /* Spacing — 4px base */
  --s1: 0.25rem; --s2: 0.5rem; --s3: 0.75rem; --s4: 1rem;
  --s6: 1.5rem; --s8: 2rem; --s12: 3rem; --s16: 4rem; --s24: 6rem;

  /* Radius — subtle, not bubbly */
  --r1: 4px; --r2: 6px; --r3: 8px; --r4: 12px;

  /* Transitions */
  --ease: cubic-bezier(0.25, 0.1, 0.25, 1);
  --duration: 200ms;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--ink);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: var(--accent); text-decoration: none; transition: color var(--duration) var(--ease); }
a:hover { color: var(--text-primary); }
img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.15;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
h1 { font-size: clamp(2.4rem, 4.5vw, 3.8rem); }
h2 { font-size: clamp(1.8rem, 3vw, 2.6rem); }
h3 { font-size: 1.3rem; }

p { max-width: 65ch; }

/* --- Layout --- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--s8); }
.section { padding: var(--s24) 0; }

/* --- GSU Institutional Bar --- */
.gsu-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--s6);
  padding: var(--s2) 0;
  background: var(--ink);
  border-bottom: 1px solid var(--border);
  font-size: 0.7rem;
  font-family: var(--font-body);
  letter-spacing: 0.03em;
  color: var(--text-dim);
  position: relative;
  z-index: 1001;
}
.gsu-bar a { color: var(--text-secondary); font-weight: 500; }
.gsu-bar a:hover { color: var(--accent); }

/* --- Navigation --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 1000;
  padding: var(--s4) 0;
  background: rgba(12,12,14,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: padding var(--duration) var(--ease);
}
.nav--scrolled { padding: var(--s2) 0; }
.nav__inner { display: flex; align-items: center; justify-content: space-between; }

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--s2);
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}
.nav__logo span { color: var(--accent); }
.nav__logo-globe { font-size: 1.4rem; line-height: 1; }

.nav__links {
  display: flex; align-items: center; gap: var(--s8); list-style: none;
}
.nav__links a {
  color: var(--text-secondary);
  font-size: 0.82rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color var(--duration) var(--ease);
}
.nav__links a:hover { color: var(--text-primary); }

.nav__cta {
  display: inline-flex; align-items: center; gap: var(--s2);
  padding: 0.5rem 1.2rem;
  background: var(--accent);
  color: var(--ink) !important;
  border-radius: var(--r2);
  font-weight: 600; font-size: 0.8rem;
  letter-spacing: 0.02em;
  transition: all var(--duration) var(--ease);
}
.nav__cta:hover { opacity: 0.88; color: var(--ink) !important; }

.nav__toggle {
  display: none; flex-direction: column; gap: 5px;
  background: none; border: none; cursor: pointer; padding: var(--s2);
}
.nav__toggle span {
  display: block; width: 22px; height: 1.5px;
  background: var(--text-primary); border-radius: 1px;
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 85vh;
  display: flex;
  align-items: center;
  background: var(--ink);
  overflow: hidden;
}
.hero__bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 65% 40%, rgba(61,107,170,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 50% 50% at 20% 80%, rgba(201,168,76,0.04) 0%, transparent 70%);
}
.hero__grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.018) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.018) 1px, transparent 1px);
  background-size: 80px 80px;
}
.hero__visual {
  position: absolute; right: -2%; top: 50%; transform: translateY(-50%);
  width: 48%; max-width: 600px; opacity: 0.06; z-index: 1;
}
.hero__visual svg { width: 100%; height: auto; }
.hero__content { position: relative; z-index: 2; max-width: 720px; }

.hero__badge { margin-bottom: var(--s8); }

.badge {
  display: inline-flex; align-items: center; gap: var(--s2);
  padding: var(--s1) var(--s3);
  font-size: 0.68rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--text-secondary);
  border: 1px solid var(--border);
  border-radius: var(--r2);
}
.badge--accent { color: var(--accent); border-color: rgba(201,168,76,0.2); }

.hero__title {
  margin-bottom: var(--s6);
  font-style: italic;
}
.hero__title .gradient-text {
  color: var(--accent);
  -webkit-text-fill-color: var(--accent);
  background: none;
}
.hero__subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.75;
  margin-bottom: var(--s8);
}
.hero__actions { display: flex; gap: var(--s4); flex-wrap: wrap; }

.hero__stats {
  display: flex; gap: var(--s16);
  margin-top: var(--s12);
  padding-top: var(--s8);
  border-top: 1px solid var(--border);
}
.hero__stat-value {
  font-family: var(--font-heading);
  font-size: 2rem; font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}
.hero__stat-label {
  font-size: 0.75rem; color: var(--text-dim);
  text-transform: uppercase; letter-spacing: 0.06em;
  margin-top: var(--s1);
}

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; gap: var(--s2);
  padding: 0.7rem 1.5rem;
  border-radius: var(--r2);
  font-weight: 600; font-size: 0.88rem;
  cursor: pointer; border: none;
  transition: all var(--duration) var(--ease);
  letter-spacing: 0.01em;
}
.btn--primary {
  background: var(--accent);
  color: var(--ink);
}
.btn--primary:hover { opacity: 0.88; color: var(--ink); }
.btn--outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hover);
}
.btn--outline:hover {
  background: rgba(255,255,255,0.04);
  border-color: var(--text-secondary);
  color: var(--text-primary);
}

/* --- PI Banner --- */
.pi-banner {
  display: flex; align-items: center; gap: var(--s6);
  padding: var(--s6);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r3);
  margin-top: var(--s12);
}
.pi-banner__avatar {
  width: 72px; height: 72px; border-radius: var(--r3);
  background: var(--accent-subtle);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; font-weight: 700;
  color: var(--accent); flex-shrink: 0;
  font-family: var(--font-heading);
}
.pi-banner__info h3 { font-family: var(--font-body); font-size: 1rem; font-weight: 600; margin-bottom: 0.15rem; }
.pi-banner__info .pi-role { color: var(--accent); font-size: 0.78rem; font-weight: 600; margin-bottom: 0.2rem; letter-spacing: 0.02em; }
.pi-banner__info .pi-affiliation { color: var(--text-dim); font-size: 0.78rem; }
.pi-banner__info .pi-affiliation a { color: var(--text-secondary); }

/* --- Section Headers --- */
.section-header { margin-bottom: var(--s12); }
.section-header__label {
  display: inline-flex; align-items: center; gap: var(--s2);
  color: var(--accent); font-size: 0.72rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.1em;
  margin-bottom: var(--s4);
}
.section-header__title { margin-bottom: var(--s4); }
.section-header__desc {
  font-size: 1rem; color: var(--text-secondary); max-width: 560px; line-height: 1.7;
}
.section-header.text-center { text-align: center; }
.section-header.text-center .section-header__desc { margin: 0 auto; }

/* --- Country Grid --- */
.countries-section { background: var(--ink); }

.country-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--r3);
  overflow: hidden;
}

.country-card {
  position: relative; overflow: hidden;
  background: var(--surface);
  cursor: pointer; text-decoration: none;
  color: var(--text-primary);
  transition: background var(--duration) var(--ease);
  border: none; border-radius: 0;
}
.country-card:hover {
  background: var(--raised);
  color: var(--text-primary);
}

.country-card__image {
  height: 160px; overflow: hidden; position: relative;
}
.country-card__image img {
  width: 100%; height: 100%; object-fit: cover;
  filter: brightness(0.7) saturate(0.8);
  transition: all 0.4s var(--ease);
}
.country-card:hover .country-card__image img {
  filter: brightness(0.85) saturate(1);
  transform: scale(1.03);
}
.country-card__image::after {
  content: ''; position: absolute; bottom: 0; left: 0; right: 0;
  height: 50%;
  background: linear-gradient(transparent, var(--surface));
}

.country-card__body { padding: var(--s6); }
.country-card__name {
  font-family: var(--font-heading);
  font-size: 1.2rem; font-weight: 600;
  margin-bottom: var(--s1);
}
.country-card__region {
  font-size: 0.68rem; color: var(--text-dim);
  text-transform: uppercase; letter-spacing: 0.08em;
  margin-bottom: var(--s4);
  padding-left: 12px;
  border-left: 2px solid var(--accent);
}
/* Region color coding */
.country-card[data-region="north"] .country-card__region { border-color: var(--region-north); color: var(--region-north); }
.country-card[data-region="west"] .country-card__region { border-color: var(--region-west); color: var(--region-west); }
.country-card[data-region="east"] .country-card__region { border-color: var(--region-east); color: var(--region-east); }
.country-card[data-region="south"] .country-card__region { border-color: var(--region-south); color: var(--region-south); }

.country-card__stats {
  display: flex; gap: var(--s6);
}
.country-card__stat-value {
  font-family: var(--font-mono);
  font-size: 0.85rem; font-weight: 600;
  color: var(--text-primary);
}
.country-card__stat-label {
  font-size: 0.65rem; color: var(--text-dim);
  text-transform: uppercase; letter-spacing: 0.04em;
}

.country-card__arrow {
  position: absolute; bottom: var(--s6); right: var(--s6);
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  color: var(--text-dim);
  transition: color var(--duration) var(--ease);
}
.country-card:hover .country-card__arrow { color: var(--accent); }

.country-flag--small { font-size: 1.2rem; margin-right: 0.3rem; }

/* --- Videos --- */
.videos-section { background: var(--surface); }
.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: var(--s6);
}
.video-card {
  border-radius: var(--r3); overflow: hidden;
  background: var(--raised);
  border: 1px solid var(--border);
  transition: border-color var(--duration) var(--ease);
}
.video-card:hover { border-color: var(--border-hover); }
.video-card__embed { position: relative; padding-top: 56.25%; }
.video-card__embed iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none; }
.video-card__info { padding: var(--s4) var(--s6); }
.video-card__title { font-family: var(--font-body); font-size: 0.9rem; font-weight: 600; margin-bottom: var(--s1); }
.video-card__source { font-size: 0.75rem; color: var(--text-dim); }

/* --- Resources --- */
.resources-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--r3);
  overflow: hidden;
}
.resource-card {
  display: flex; align-items: flex-start; gap: var(--s4);
  padding: var(--s6);
  background: var(--surface);
  text-decoration: none; color: var(--text-primary);
  transition: background var(--duration) var(--ease);
}
.resource-card:hover { background: var(--raised); color: var(--text-primary); }
.resource-card__icon {
  width: 36px; height: 36px; border-radius: var(--r2);
  background: var(--accent-subtle);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; font-size: 1rem;
}
.resource-card__name { font-weight: 600; font-size: 0.9rem; margin-bottom: 0.15rem; }
.resource-card__desc { font-size: 0.78rem; color: var(--text-dim); line-height: 1.5; }

/* --- PESTEL --- */
.pestel-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--s6);
}
.pestel-card {
  padding: var(--s8);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r3);
  transition: border-color var(--duration) var(--ease);
}
.pestel-card:hover { border-color: var(--border-hover); }
.pestel-card__letter {
  width: 40px; height: 40px; border-radius: var(--r2);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-heading); font-size: 1.2rem; font-weight: 700;
  margin-bottom: var(--s4);
}
.pestel-card__letter--p  { background: rgba(61,107,170,0.15); color: #6b9fd4; }
.pestel-card__letter--e  { background: rgba(124,154,94,0.15); color: #9aba7e; }
.pestel-card__letter--s  { background: rgba(201,168,76,0.15); color: var(--accent); }
.pestel-card__letter--t  { background: rgba(140,100,180,0.15); color: #b08ee0; }
.pestel-card__letter--en { background: rgba(80,160,140,0.15); color: #6cc4b0; }
.pestel-card__letter--l  { background: rgba(176,122,91,0.15); color: #c49a7b; }
.pestel-card__title { font-family: var(--font-body); font-size: 0.95rem; font-weight: 600; margin-bottom: var(--s2); }
.pestel-card__text { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7; }

/* --- Faculty --- */
.faculty-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--s6);
}
.faculty-card {
  padding: var(--s8);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r3);
  transition: border-color var(--duration) var(--ease);
}
.faculty-card:hover { border-color: var(--border-hover); }
.faculty-card__avatar {
  width: 64px; height: 64px; border-radius: var(--r3);
  background: var(--accent-subtle);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: var(--s4);
  font-family: var(--font-heading); font-size: 1.2rem; font-weight: 600;
  color: var(--accent);
}
.faculty-card__name { font-family: var(--font-body); font-size: 1rem; font-weight: 600; margin-bottom: var(--s1); }
.faculty-card__title { font-size: 0.78rem; color: var(--text-dim); margin-bottom: var(--s3); }
.faculty-card__email { font-size: 0.8rem; color: var(--accent); }

/* --- Trade Section (country pages) --- */
.trade-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--s8);
  align-items: start;
}
.trade-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r3);
  padding: var(--s8) var(--s8) var(--s6);
  transition: border-color var(--duration) var(--ease);
}
.trade-card:hover { border-color: var(--border-hover); }
.trade-card h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: var(--s6);
  padding-bottom: var(--s4);
  border-bottom: 1px solid var(--border);
}
.trade-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.85;
  margin-bottom: var(--s4);
}
.trade-card .btn-row {
  display: flex;
  gap: var(--s4);
  margin-top: var(--s6);
  padding-top: var(--s4);
  border-top: 1px solid var(--border);
}

/* Legacy glass-card support */
.glass-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r3);
  padding: var(--s8);
  transition: border-color var(--duration) var(--ease);
}
.glass-card:hover { border-color: var(--border-hover); }
.glass-card h3 {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: var(--s6);
}
.glass-card p {
  color: var(--text-secondary);
  font-size: 0.92rem;
  line-height: 1.85;
  margin-bottom: var(--s4);
}

/* Legacy variable compatibility for country pages with inline styles */
:root {
  --space-md: var(--s4);
  --space-lg: var(--s6);
  --space-xl: var(--s8);
  --space-2xl: var(--s8);
  --space-3xl: var(--s12);
  --color-gray-300: var(--text-secondary);
  --color-dark-surface: var(--surface);
}

@media (max-width: 768px) {
  .trade-grid { grid-template-columns: 1fr; }
}

/* --- CTA Banner --- */
.cta-banner {
  padding: var(--s16) var(--s8);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r3);
  text-align: center;
}
.cta-banner__title {
  font-family: var(--font-heading);
  font-size: 1.8rem; color: var(--text-primary);
  margin-bottom: var(--s4);
}
.cta-banner__desc {
  color: var(--text-secondary); font-size: 1rem;
  margin: 0 auto var(--s8); max-width: 480px;
}
.cta-banner .btn { background: var(--accent); color: var(--ink); }
.cta-banner .btn:hover { opacity: 0.88; color: var(--ink); }

/* --- Footer --- */
.footer {
  background: var(--ink);
  border-top: 1px solid var(--border);
  padding: var(--s16) 0 var(--s8);
}
.footer__grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: var(--s12);
  margin-bottom: var(--s8);
}
.footer__brand-desc { color: var(--text-dim); font-size: 0.82rem; margin-top: var(--s4); max-width: 280px; line-height: 1.7; }
.footer__heading {
  font-family: var(--font-body); font-size: 0.68rem; font-weight: 600;
  text-transform: uppercase; letter-spacing: 0.1em;
  color: var(--text-secondary); margin-bottom: var(--s4);
}
.footer__links { list-style: none; display: flex; flex-direction: column; gap: var(--s2); }
.footer__links a { color: var(--text-dim); font-size: 0.82rem; }
.footer__links a:hover { color: var(--accent); }
.footer__bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: var(--s6);
  border-top: 1px solid var(--border);
  color: var(--text-dim); font-size: 0.72rem;
}

/* --- Country Hero (country pages) --- */
.country-flag { font-size: 3.5rem; line-height: 1; margin-bottom: var(--s4); }

/* --- Dead code cleanup --- */
.reveal { opacity: 1; transform: none; }
.badge--accent svg { opacity: 0.6; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .hero__visual { display: none; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .country-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .nav__links { display: none; }
  .nav__toggle { display: flex; }
  .nav__links--open {
    display: flex; flex-direction: column;
    position: absolute; top: 100%; left: 0; right: 0;
    background: var(--surface); border-bottom: 1px solid var(--border);
    padding: var(--s6); gap: var(--s4);
  }

  .hero { min-height: auto; padding: 6rem 0 var(--s12); }
  .hero__stats { flex-direction: column; gap: var(--s4); }
  .hero__title { font-size: 2rem; }
  .pi-banner { flex-direction: column; text-align: center; }

  .country-grid { grid-template-columns: 1fr; }
  .video-grid { grid-template-columns: 1fr; }
  .pestel-grid { grid-template-columns: 1fr; }
  .faculty-grid { grid-template-columns: 1fr; }
  .resources-grid { grid-template-columns: 1fr; }

  .footer__grid { grid-template-columns: 1fr; }
  .footer__bottom { flex-direction: column; gap: var(--s4); text-align: center; }

  .section { padding: var(--s12) 0; }
  .gsu-bar { display: none; }
}