/* =============================================
   UPSKILL360.AI — Design System
   ============================================= */

/* 1. DESIGN TOKENS */
:root {
  --navy:       #0F1F3D;
  --charcoal:   #3D4451;
  --muted:      #8892A4;
  --gold:       #B8973A;
  --gold-light: #F5ECD7;
  --off-white:  #F8F7F4;
  --white:      #FFFFFF;
  --divider:    #E2E5EA;

  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans:  'Inter', system-ui, sans-serif;

  --max-width: 1160px;
  --section-v: 120px;
  --radius:    4px;
  --transition: 0.25s ease;
}

/* 2. RESET & BASE */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-sans);
  color: var(--charcoal);
  background: var(--off-white);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

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

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

ul { list-style: none; }

/* 3. TYPOGRAPHY */
h1, h2, h3 {
  font-family: var(--font-serif);
  color: var(--navy);
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(2.4rem, 5vw, 4rem); }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.75rem); }
h3 { font-family: var(--font-sans); font-size: 1.1rem; font-weight: 600; }

p { max-width: 65ch; }

.overline {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
}

/* 4. LAYOUT */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

section {
  padding: var(--section-v) 0;
}

.section-header {
  margin-bottom: 64px;
}

.section-header .overline {
  margin-bottom: 12px;
}

.section-header h2 {
  margin-top: 8px;
}

/* 5. REVEAL ANIMATION */
[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

[data-reveal].visible {
  opacity: 1;
  transform: none;
}

[data-reveal-delay="1"] { transition-delay: 0.1s; }
[data-reveal-delay="2"] { transition-delay: 0.2s; }
[data-reveal-delay="3"] { transition-delay: 0.3s; }
[data-reveal-delay="4"] { transition-delay: 0.4s; }

/* 6. BUTTONS */
.btn {
  display: inline-block;
  padding: 14px 28px;
  font-family: var(--font-sans);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border-radius: var(--radius);
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition);
}

.btn-gold {
  background: var(--gold);
  color: var(--white);
  border-color: var(--gold);
}

.btn-gold:hover {
  background: #9e7f31;
  border-color: #9e7f31;
}

.btn-ghost-white {
  background: transparent;
  color: var(--white);
  border-color: rgba(255,255,255,0.5);
}

.btn-ghost-white:hover {
  border-color: var(--white);
}

.btn-gold-outline {
  background: transparent;
  color: var(--gold);
  border-color: var(--gold);
}

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

.btn-gold-sm {
  display: inline-block;
  padding: 9px 20px;
  font-size: 0.82rem;
  font-weight: 600;
  background: var(--gold);
  color: var(--white);
  border-radius: var(--radius);
  border: 2px solid var(--gold);
  transition: background var(--transition), border-color var(--transition);
}

.btn-gold-sm:hover {
  background: #9e7f31;
  border-color: #9e7f31;
}

/* =============================================
   7. NAVIGATION
   ============================================= */
#site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 0;
  transition: background var(--transition), box-shadow var(--transition), padding var(--transition);
}

#site-nav.scrolled {
  background: var(--white);
  box-shadow: 0 1px 0 var(--divider);
  padding: 14px 0;
}

.nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.wordmark {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--white);
  transition: color var(--transition);
}

#site-nav.scrolled .wordmark {
  color: var(--navy);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
}

.nav-links a:not(.btn-gold-sm) {
  font-size: 0.88rem;
  font-weight: 500;
  color: rgba(255,255,255,0.85);
  position: relative;
  transition: color var(--transition);
}

.nav-links a:not(.btn-gold-sm)::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--gold);
  transition: width var(--transition);
}

.nav-links a:not(.btn-gold-sm):hover {
  color: var(--white);
}

.nav-links a:not(.btn-gold-sm):hover::after {
  width: 100%;
}

#site-nav.scrolled .nav-links a:not(.btn-gold-sm) {
  color: var(--charcoal);
}

#site-nav.scrolled .nav-links a:not(.btn-gold-sm):hover {
  color: var(--navy);
}

.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  flex-direction: column;
  gap: 5px;
}

.hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}

#site-nav.scrolled .hamburger span {
  background: var(--navy);
}

/* Mobile nav open state */
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* =============================================
   8. HERO
   ============================================= */
#hero {
  min-height: 100vh;
  background: var(--navy);
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
}

.hero-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}

.hero-inner .overline {
  margin-bottom: 24px;
}

.hero-inner h1 {
  color: var(--white);
  max-width: 14ch;
  margin-bottom: 28px;
}

.hero-rule {
  width: 48px;
  height: 3px;
  background: var(--gold);
  margin-bottom: 28px;
  border: none;
}

.hero-subhead {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.72);
  max-width: 52ch;
  margin-bottom: 44px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* =============================================
   9. WHY US
   ============================================= */
#why-us {
  background: var(--white);
}

.why-us-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}

/* Credential block */
.credential-block {
  border-left: 3px solid var(--gold);
  padding-left: 28px;
}

.credential-tags {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 24px;
}

.credential-tag {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--gold);
  background: var(--gold-light);
  padding: 5px 12px;
  border-radius: 2px;
  width: fit-content;
}

.credential-block p {
  color: var(--charcoal);
  font-size: 1.05rem;
  line-height: 1.75;
}

/* Differentiators */
.differentiators {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.diff-item {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.diff-icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  background: var(--gold-light);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.diff-icon svg {
  width: 20px;
  height: 20px;
  stroke: var(--gold);
  fill: none;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.diff-item h3 {
  margin-bottom: 6px;
  color: var(--navy);
}

.diff-item p {
  color: var(--charcoal);
  font-size: 0.95rem;
}

/* =============================================
   10. PROGRAMMES
   ============================================= */
#programmes {
  background: var(--off-white);
}

.programmes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}

.prog-card {
  background: var(--white);
  padding: 40px 36px;
  border-left: 3px solid var(--gold);
  transition: border-left-width var(--transition);
}

.prog-card:hover {
  border-left-width: 5px;
}

.prog-card h3 {
  color: var(--navy);
  font-size: 1.15rem;
  margin-bottom: 14px;
}

.prog-card > p {
  color: var(--charcoal);
  font-size: 0.95rem;
  margin-bottom: 24px;
}

.prog-details {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.prog-details li {
  font-size: 0.88rem;
  color: var(--charcoal);
  padding-left: 16px;
  position: relative;
}

.prog-details li::before {
  content: '–';
  color: var(--gold);
  position: absolute;
  left: 0;
  font-weight: 600;
}

/* Pillar number */
.pillar-number {
  font-family: var(--font-serif);
  font-size: 2.5rem;
  font-weight: 700;
  color: var(--gold-light);
  line-height: 1;
  margin-bottom: 12px;
}

/* =============================================
   11. WHO WE SERVE
   ============================================= */
#who-we-serve {
  background: var(--navy);
}

#who-we-serve .section-header .overline {
  color: var(--gold);
}

#who-we-serve .section-header h2 {
  color: var(--white);
}

.serve-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.serve-tile {
  background: rgba(255,255,255,0.06);
  border: 1px solid rgba(255,255,255,0.1);
  padding: 36px 32px;
  border-radius: var(--radius);
  transition: background var(--transition);
}

.serve-tile:hover {
  background: rgba(255,255,255,0.09);
}

.serve-tile h3 {
  color: var(--white);
  font-family: var(--font-sans);
  font-size: 1.05rem;
  margin-bottom: 12px;
}

.serve-tile p {
  color: rgba(255,255,255,0.65);
  font-size: 0.93rem;
  line-height: 1.7;
}

/* =============================================
   12. CONTACT
   ============================================= */
#contact {
  background: var(--white);
}

.contact-intro {
  max-width: 600px;
  margin-bottom: 64px;
}

.contact-intro h2 {
  margin: 12px 0 16px;
}

.contact-intro .response-note {
  font-size: 0.9rem;
  color: var(--muted);
  margin-top: 12px;
}

.contact-intro .response-note strong {
  color: var(--charcoal);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 80px;
  align-items: start;
}

.contact-direct h3 {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 16px;
}

.contact-direct p {
  font-size: 0.95rem;
  color: var(--charcoal);
  margin-bottom: 20px;
}

.contact-email-link {
  font-size: 1rem;
  font-weight: 600;
  color: var(--gold);
  word-break: break-all;
  display: block;
  margin-bottom: 20px;
}

/* Form */
.enquiry-form {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--charcoal);
  text-transform: uppercase;
}

.form-group input,
.form-group select,
.form-group textarea {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--charcoal);
  background: var(--off-white);
  border: 1px solid var(--divider);
  border-radius: var(--radius);
  padding: 12px 16px;
  transition: border-color var(--transition);
  outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--gold);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.form-group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%238892A4' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 14px center;
  padding-right: 36px;
}

.form-submit {
  margin-top: 4px;
}

/* =============================================
   13. FOOTER
   ============================================= */
footer {
  background: var(--navy);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-brand .wordmark {
  color: var(--white);
  font-size: 1.1rem;
  display: block;
  margin-bottom: 10px;
}

.footer-brand p {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.5);
  max-width: 28ch;
}

.footer-col h4 {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 16px;
}

.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-col ul a {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.55);
  transition: color var(--transition);
}

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

.footer-col .footer-email {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  transition: color var(--transition);
}

.footer-col .footer-email:hover {
  color: var(--gold);
}

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  font-size: 0.82rem;
  color: rgba(255,255,255,0.35);
}

/* =============================================
   14. RESPONSIVE
   ============================================= */
@media (max-width: 900px) {
  :root { --section-v: 80px; }

  .why-us-grid,
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .programmes-grid {
    grid-template-columns: 1fr;
  }

  .serve-grid {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .nav-inner { padding: 0 20px; }
  .hero-inner { padding: 0 20px; }

  /* Mobile hamburger */
  .hamburger {
    display: flex;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--navy);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 40px;
    z-index: 99;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a:not(.btn-gold-sm) {
    font-size: 1.3rem;
    color: var(--white);
  }

  .nav-links .btn-gold-sm {
    font-size: 1rem;
    padding: 14px 32px;
  }

  .hero-inner h1 {
    max-width: 100%;
  }

  .form-row {
    grid-template-columns: 1fr;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
}