/* ============================================================
   KEENAN SOLOMON — DESIGN SYSTEM
   ============================================================ */

/* --- Google Fonts Import --- */
@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;0,900;1,400&family=Inter:wght@300;400;500;600&family=DM+Sans:wght@300;400;500;600&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- CSS Custom Properties --- */
:root {
  /* Colours */
  --navy:        #0D1B2A;
  --navy-light:  #162333;
  --navy-mid:    #1E3148;
  --amber:       #C9832A;
  --amber-dark:  #A8691E;
  --amber-light: #E09B44;
  --offwhite:    #F2EDE4;
  --offwhite-dim:#E8E1D6;
  --sage:        #5C7A6B;
  --sage-dark:   #4A6458;
  --steel:       #8A9BAE;
  --steel-dark:  #6B7F91;
  --white:       #FFFFFF;

  /* Typography */
  --font-serif:  'Playfair Display', Georgia, serif;
  --font-sans:   'Inter', 'DM Sans', system-ui, sans-serif;
  --font-mono:   'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing scale */
  --sp-1:  0.25rem;
  --sp-2:  0.5rem;
  --sp-3:  0.75rem;
  --sp-4:  1rem;
  --sp-6:  1.5rem;
  --sp-8:  2rem;
  --sp-10: 2.5rem;
  --sp-12: 3rem;
  --sp-16: 4rem;
  --sp-20: 5rem;
  --sp-24: 6rem;

  /* Shadows */
  --shadow-card:  0 4px 24px rgba(13, 27, 42, 0.12);
  --shadow-hover: 0 8px 40px rgba(13, 27, 42, 0.18);
  --shadow-amber: 0 4px 24px rgba(201, 131, 42, 0.25);

  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  /* Transitions */
  --transition: 0.25s ease;
  --transition-slow: 0.45s ease;

  /* Container */
  --container-max: 1200px;
  --container-pad: var(--sp-6);
}

/* ============================================================
   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(--navy);
  background-color: var(--offwhite);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

button, input, textarea, select {
  font-family: var(--font-sans);
  font-size: inherit;
}

/* ============================================================
   GRAIN TEXTURE OVERLAY — Applied to dark navy sections
   ============================================================ */
.grain::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.04'/%3E%3C/svg%3E");
  background-repeat: repeat;
  background-size: 200px 200px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.45;
}

.grain > * {
  position: relative;
  z-index: 1;
}

/* ============================================================
   CONTAINER
   ============================================================ */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-pad);
}

/* ============================================================
   TYPOGRAPHY
   ============================================================ */
h1, h2, h3, h4, h5 {
  font-family: var(--font-serif);
  line-height: 1.2;
  font-weight: 700;
}

h1 { font-size: clamp(2.4rem, 6vw, 4.5rem); }
h2 { font-size: clamp(1.8rem, 4vw, 3rem); }
h3 { font-size: clamp(1.3rem, 2.5vw, 1.9rem); }
h4 { font-size: 1.2rem; }

p {
  font-size: 1rem;
  line-height: 1.75;
}

.text-steel   { color: var(--steel); }
.text-amber   { color: var(--amber); }
.text-sage    { color: var(--sage); }
.text-offwhite{ color: var(--offwhite); }
.text-navy    { color: var(--navy); }

.mono {
  font-family: var(--font-mono);
  font-size: 0.85em;
}

/* ============================================================
   SECTION LABEL
   ============================================================ */
.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--amber);
  margin-bottom: var(--sp-3);
  display: block;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background var(--transition), color var(--transition),
              border-color var(--transition), transform var(--transition),
              box-shadow var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--amber);
  color: var(--white);
  border-color: var(--amber);
}
.btn-primary:hover {
  background: var(--amber-dark);
  border-color: var(--amber-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-amber);
}

.btn-outline {
  background: transparent;
  color: var(--amber);
  border-color: var(--amber);
}
.btn-outline:hover {
  background: var(--amber);
  color: var(--white);
  transform: translateY(-2px);
}

.btn-outline-white {
  background: transparent;
  color: var(--offwhite);
  border-color: var(--offwhite);
}
.btn-outline-white:hover {
  background: var(--offwhite);
  color: var(--navy);
  transform: translateY(-2px);
}

/* ============================================================
   SKILL/TAG CHIPS
   ============================================================ */
.chip {
  display: inline-block;
  padding: 0.3em 0.85em;
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 500;
  line-height: 1.4;
}

.chip-navy {
  background: var(--navy);
  color: var(--offwhite);
}

.chip-amber {
  background: var(--amber);
  color: var(--white);
  font-family: var(--font-mono);
}

.chip-sage {
  background: var(--sage);
  color: var(--white);
}

.chip-outline {
  background: transparent;
  border: 1.5px solid var(--steel);
  color: var(--steel);
}

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background: var(--offwhite);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
}

/* ============================================================
   SECTION DIVIDERS — Diagonal clip-path transitions
   ============================================================ */
.divider-down {
  clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
  padding-bottom: 6rem;
}

.divider-up {
  clip-path: polygon(0 15%, 100% 0, 100% 100%, 0 100%);
  padding-top: 6rem;
}

.divider-both {
  clip-path: polygon(0 5%, 100% 0, 100% 95%, 0 100%);
  padding: 6rem 0;
}

/* ============================================================
   SCROLL-REVEAL ANIMATIONS
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }
.reveal-delay-5 { transition-delay: 0.5s; }

/* ============================================================
   NAVBAR
   ============================================================ */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: var(--sp-4) 0;
  transition: background var(--transition-slow), backdrop-filter var(--transition-slow),
              padding var(--transition), box-shadow var(--transition);
}

.navbar.scrolled {
  background: rgba(13, 27, 42, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: var(--sp-3) 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.navbar-logo {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--offwhite);
  letter-spacing: 0.02em;
}

.navbar-logo span {
  color: var(--amber);
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: var(--sp-6);
}

.navbar-links a {
  color: var(--steel);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color var(--transition);
  position: relative;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--amber);
  transition: width var(--transition);
}

.navbar-links a:hover {
  color: var(--offwhite);
}

.navbar-links a.active {
  color: var(--amber);
}

.navbar-links a:hover::after,
.navbar-links a.active::after {
  width: 100%;
}

.navbar-links .nav-cta {
  background: var(--amber);
  color: var(--white) !important;
  padding: 0.45rem 1.1rem;
  border-radius: var(--radius-md);
  font-weight: 600;
}

.navbar-links .nav-cta::after {
  display: none;
}

.navbar-links .nav-cta:hover {
  background: var(--amber-dark);
  transform: translateY(-1px);
}

/* Hamburger */
.navbar-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: var(--sp-2);
  background: none;
  border: none;
}

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

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

/* Mobile nav */
.navbar-mobile {
  display: none;
  flex-direction: column;
  background: var(--navy);
  padding: var(--sp-4) var(--sp-6);
  gap: var(--sp-4);
  border-top: 1px solid var(--navy-mid);
}

.navbar-mobile a {
  color: var(--steel);
  font-size: 1rem;
  font-weight: 500;
  transition: color var(--transition);
  padding: var(--sp-2) 0;
  border-bottom: 1px solid var(--navy-mid);
}

.navbar-mobile a:hover {
  color: var(--amber);
}

.navbar-mobile.open {
  display: flex;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: var(--navy);
  color: var(--steel);
  padding: var(--sp-12) 0 var(--sp-8);
  position: relative;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--sp-8);
  margin-bottom: var(--sp-8);
}

.footer-brand .footer-logo {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  color: var(--offwhite);
  margin-bottom: var(--sp-3);
}

.footer-brand .footer-logo span {
  color: var(--amber);
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--steel);
  line-height: 1.6;
}

.footer-links h4 {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--offwhite);
  margin-bottom: var(--sp-4);
}

.footer-links ul {
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.footer-links a {
  color: var(--steel);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--amber);
}

.footer-bottom {
  border-top: 1px solid var(--navy-mid);
  padding-top: var(--sp-6);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-3);
  font-size: 0.85rem;
}

.footer-bottom a {
  color: var(--amber);
  transition: color var(--transition);
}

/* ============================================================
   RESPONSIVE BREAKPOINTS
   ============================================================ */
@media (max-width: 1024px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  :root {
    --container-pad: var(--sp-4);
  }

  .navbar-links {
    display: none;
  }

  .navbar-hamburger {
    display: flex;
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--sp-6);
  }

  .footer-bottom {
    flex-direction: column;
    text-align: center;
  }
}

/* ============================================================
   UTILITY CLASSES
   ============================================================ */
.dark-bg     { background: var(--navy); color: var(--offwhite); }
.light-bg    { background: var(--offwhite); color: var(--navy); }
.text-center { text-align: center; }
.mt-4  { margin-top: var(--sp-4); }
.mt-6  { margin-top: var(--sp-6); }
.mt-8  { margin-top: var(--sp-8); }
.mt-12 { margin-top: var(--sp-12); }
.mb-4  { margin-bottom: var(--sp-4); }
.mb-6  { margin-bottom: var(--sp-6); }
.mb-8  { margin-bottom: var(--sp-8); }
.flex  { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.gap-2 { gap: var(--sp-2); }
.gap-3 { gap: var(--sp-3); }
.gap-4 { gap: var(--sp-4); }
.gap-6 { gap: var(--sp-6); }
.flex-wrap { flex-wrap: wrap; }