/* ============================================================
   CSS Custom Properties — Design Tokens
   ============================================================ */
:root {
  /* Colours */
  --color-primary:      #2563EB;
  --color-primary-dark: #1D4ED8;
  --color-accent:       #7C3AED;
  --color-bg:           #0F172A;
  --color-surface:      #1E293B;
  --color-surface-2:    #334155;
  --color-text:         #F1F5F9;
  --color-text-muted:   #94A3B8;
  --color-border:       #334155;

  /* Typography */
  --font-sans:          'Inter', system-ui, sans-serif;
  --font-display:       'Sora', 'Inter', sans-serif;

  /* Border radii */
  --radius-sm:          0.375rem;
  --radius-md:          0.75rem;
  --radius-lg:          1.25rem;

  /* Shadows */
  --shadow-card:        0 4px 24px rgba(0,0,0,0.3);

  /* Transitions */
  --transition-base:    200ms ease;
  --transition-slow:    400ms ease;

  /* Layout */
  --max-width:          1200px;
}

/* ============================================================
   Reset & Base Styles
   ============================================================ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-sans);
  background-color: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  font-size: 16px;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6,
p, ul, ol, figure, blockquote, dl, dd {
  margin: 0;
  padding: 0;
}

ul, ol {
  list-style: none;
}

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

input, button, textarea, select {
  font: inherit;
}

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

.container {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ============================================================
   Navigation Bar
   ============================================================ */
#navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  transition: background-color var(--transition-base), box-shadow var(--transition-base);
}

#navbar.scrolled {
  background-color: rgba(15, 23, 42, 0.95);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 24px rgba(0, 0, 0, 0.4);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-links a {
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  transition: color var(--transition-base);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-primary);
  transition: width var(--transition-base);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--color-text);
}

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

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--color-text);
}

.hamburger,
.hamburger::before,
.hamburger::after {
  display: block;
  width: 22px;
  height: 2px;
  background-color: currentColor;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.hamburger {
  position: relative;
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
}

.hamburger::before { top: -7px; }
.hamburger::after  { top: 7px; }

/* ============================================================
   Hero Section
   ============================================================ */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 4rem; /* offset for fixed navbar */
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 680px;
  padding-block: 6rem;
}

.hero-eyebrow {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 6vw, 4rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: 1.5rem;
}

.hero-title .accent {
  color: var(--color-accent);
}

.hero-subtitle {
  font-size: 1.125rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 540px;
}

.hero-bg-shape {
  position: absolute;
  top: -20%;
  right: -10%;
  width: 60vw;
  height: 60vw;
  max-width: 700px;
  max-height: 700px;
  border-radius: 50%;
  background: radial-gradient(circle at 40% 40%, rgba(37, 99, 235, 0.25), rgba(124, 58, 237, 0.15) 50%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

/* ============================================================
   Section Shared Styles
   ============================================================ */
.section {
  padding-block: 5rem;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
  margin-bottom: 0.75rem;
  text-align: center;
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--color-text-muted);
  text-align: center;
  margin-bottom: 3rem;
}

/* ============================================================
   Services Section
   ============================================================ */
.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 2rem;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.4);
}

.card-icon {
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(37, 99, 235, 0.15);
  border-radius: var(--radius-md);
  margin-bottom: 1.25rem;
  color: var(--color-primary);
}

.card-icon svg {
  width: 1.5rem;
  height: 1.5rem;
  stroke: currentColor;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.625rem;
}

.card-body {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ============================================================
   Principles Section
   ============================================================ */
.principles {
  background-color: rgba(30, 41, 59, 0.4);
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.principle-item {
  text-align: center;
  padding: 1.5rem;
}

.principle-icon {
  width: 3.5rem;
  height: 3.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.2), rgba(124, 58, 237, 0.2));
  border-radius: 50%;
  margin: 0 auto 1.25rem;
  color: var(--color-accent);
}

.principle-icon svg {
  width: 1.5rem;
  height: 1.5rem;
  stroke: currentColor;
}

.principle-item h3 {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 0.625rem;
}

.principle-item p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

/* ============================================================
   Vision / Mission / Objectives Section
   ============================================================ */
.vision-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.5rem;
  margin-top: 3rem;
}

.vision-card {
  /* inherits .card base styles */
}

.vision-card-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 1rem;
}

.vision-card p {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.7;
}

/* ============================================================
   Contact Section
   ============================================================ */
.contact {
  background-color: rgba(30, 41, 59, 0.3);
}

.contact-layout {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: 4rem;
  margin-top: 3rem;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.contact-info-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.contact-icon {
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: rgba(37, 99, 235, 0.15);
  border-radius: var(--radius-md);
  color: var(--color-primary);
}

.contact-icon svg {
  width: 1.125rem;
  height: 1.125rem;
  stroke: currentColor;
}

.contact-info-item a,
.contact-info-item address {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
  line-height: 1.5;
  font-style: normal;
  transition: color var(--transition-base);
}

.contact-info-item a:hover {
  color: var(--color-primary);
}

/* Form styles */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-group label {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
}

.form-group input,
.form-group textarea {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  color: var(--color-text);
  font-size: 0.9375rem;
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-muted);
  opacity: 0.6;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.form-group input.error,
.form-group textarea.error {
  border-color: #ef4444;
}

.field-error {
  font-size: 0.8125rem;
  color: #ef4444;
  min-height: 1.2em;
}

.form-status {
  font-size: 0.9375rem;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-md);
  text-align: center;
}

.form-status.success {
  background-color: rgba(34, 197, 94, 0.15);
  color: #4ade80;
  border: 1px solid rgba(34, 197, 94, 0.3);
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background-color: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding-block: 2rem;
}

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

.footer-logo {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text);
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.footer-links {
  display: flex;
  gap: 1.5rem;
}

.footer-links a {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--transition-base);
}

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

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-md);
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: background-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base), opacity var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 99, 235, 0.4);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: none;
}

.btn-primary:disabled,
.btn-primary[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.btn-full {
  width: 100%;
}

/* ============================================================
   Responsive Styles
   ============================================================ */

/* Tablet — 768px */
@media (max-width: 768px) {
  /* Navigation */
  .nav-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    position: fixed;
    top: 4rem;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--color-bg);
    flex-direction: column;
    justify-content: center;
    gap: 2.5rem;
    font-size: 1.25rem;
    transform: translateX(100%);
    transition: transform var(--transition-slow);
    z-index: 99;
  }

  .nav-links.nav-open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1.25rem;
  }

  /* Hero */
  .hero-content {
    padding-block: 4rem;
  }

  /* Grids → single column */
  .services-grid,
  .principles-grid,
  .vision-grid {
    grid-template-columns: 1fr;
  }

  /* Contact layout → single column */
  .contact-layout {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  /* Footer */
  .footer-inner {
    flex-direction: column;
    text-align: center;
  }
}

/* Desktop — 1024px */
@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .principles-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .vision-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* Touch-friendly sizing */
@media (max-width: 768px) {
  .btn {
    min-height: 44px;
    min-width: 44px;
  }

  .nav-links a {
    min-height: 44px;
    display: flex;
    align-items: center;
  }
}

/* ============================================================
   Scroll Animations
   ============================================================ */

/* Base hidden state */
.animate-on-scroll {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

/* Visible state (added by JS IntersectionObserver) */
.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger delay — set via JS as --stagger-delay custom property */
.service-card.animate-on-scroll,
.principle-item.animate-on-scroll,
.vision-card.animate-on-scroll {
  transition-delay: var(--stagger-delay, 0ms);
}

/* ============================================================
   Hero Entrance Animation
   ============================================================ */
@keyframes heroFadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-eyebrow {
  animation: heroFadeUp 0.6s ease forwards;
  animation-delay: 0.1s;
  opacity: 0;
}

.hero-title {
  animation: heroFadeUp 0.7s ease forwards;
  animation-delay: 0.25s;
  opacity: 0;
}

.hero-subtitle {
  animation: heroFadeUp 0.7s ease forwards;
  animation-delay: 0.4s;
  opacity: 0;
}

.hero-content .btn {
  animation: heroFadeUp 0.6s ease forwards;
  animation-delay: 0.55s;
  opacity: 0;
}

/* ============================================================
   Hover Transitions
   ============================================================ */

/* Service card hover lift — transition already on .card, ensure it covers transform + shadow */
.service-card {
  will-change: transform;
}

/* ============================================================
   Nav Active State
   ============================================================ */

/* Ensure .active class on nav links is visually distinct */
.nav-links a.active {
  color: var(--color-text);
  font-weight: 600;
}

/* ============================================================
   No-JS Fallback
   ============================================================ */
/* If JS is disabled, make all animated elements visible */
.no-js .animate-on-scroll {
  opacity: 1;
  transform: none;
}