/* =============================================
   CUSTOM PROPERTIES
   ============================================= */
:root {
  --bg-primary: #0a0f1a;
  --bg-card: #111827;
  --bg-card-hover: #151f30;
  --accent: #2c6faa;
  --accent-light: #3a82c4;
  --text-primary: #f0f2f5;
  --text-muted: #8892a4;
  --border: rgba(44, 111, 170, 0.2);
  --nav-height: 68px;
  --radius: 12px;
  --transition: 0.25s ease;
}

[data-theme="light"] {
  --bg-primary: #f5f7fa;
  --bg-card: #ffffff;
  --bg-card-hover: #f0f2f5;
  --accent: #2c6faa;
  --accent-light: #1a5a94;
  --text-primary: #0a0f1a;
  --text-muted: #4a5568;
  --border: rgba(44, 111, 170, 0.15);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--nav-height);
}

body {
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
}

ul {
  list-style: none;
}

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

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

/* =============================================
   CONTAINER
   ============================================= */
.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
}

/* =============================================
   NAVIGATION
   ============================================= */
.nav-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(10, 15, 26, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

[data-theme="light"] .nav-header {
  background: rgba(245, 247, 250, 0.9);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo img {
  height: 56px;
  width: auto;
}

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

.nav-links a {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--text-muted);
  transition: color var(--transition);
  letter-spacing: 0.02em;
}

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

/* Theme Toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: none;
  cursor: pointer;
  color: var(--text-muted);
  transition: color var(--transition), border-color var(--transition), background var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover {
  color: var(--text-primary);
  border-color: var(--accent);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Show sun in dark mode (click to switch to light), moon in light mode */
[data-theme="dark"] .icon-sun,
:root:not([data-theme="light"]) .icon-sun {
  display: block;
}

[data-theme="dark"] .icon-moon,
:root:not([data-theme="light"]) .icon-moon {
  display: none;
}

[data-theme="light"] .icon-sun {
  display: none;
}

[data-theme="light"] .icon-moon {
  display: block;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  width: 32px;
  height: 32px;
}

.hamburger span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
  transform-origin: center;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile Overlay */
.mobile-overlay {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 90;
  background: rgba(10, 15, 26, 0.97);
  backdrop-filter: blur(10px);
  transition: background var(--transition);
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transform: translateX(100%);
  transition: transform 0.3s ease;
}

.mobile-overlay.open {
  transform: translateX(0);
}

[data-theme="light"] .mobile-overlay {
  background: rgba(245, 247, 250, 0.97);
}

.mobile-links {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2.5rem;
}

.mobile-links a {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--text-muted);
  transition: color var(--transition);
}

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

/* =============================================
   HERO
   ============================================= */
.hero {
  height: 100vh;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  background: radial-gradient(ellipse at 50% 60%, rgba(44, 111, 170, 0.12) 0%, transparent 65%);
}

.hero-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
}

.logo-badge {
  display: inline-block;
}

.logo-badge img {
  height: 220px;
  width: auto;
  filter: brightness(0) invert(1);
}

[data-theme="light"] .logo-badge img {
  filter: none;
}

.hero-tagline {
  font-size: clamp(1.4rem, 4vw, 2.2rem);
  font-weight: 800;
  line-height: 1.3;
  color: var(--text-primary);
  max-width: 640px;
  letter-spacing: -0.02em;
}

.scroll-chevron {
  position: absolute;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--accent);
  animation: bounce 2s infinite;
  opacity: 0.7;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

/* =============================================
   SECTIONS (shared)
   ============================================= */
.section {
  padding: 6rem 0;
}

.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 3rem;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--accent);
  border-radius: 2px;
  margin-top: 0.5rem;
}

/* =============================================
   ABOUT
   ============================================= */
.about {
  background: var(--bg-primary);
}

.about-text {
  max-width: 800px;
}

.about-text p {
  color: var(--text-muted);
  font-size: 1.05rem;
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.about-text p:last-child {
  margin-bottom: 0;
}

/* =============================================
   PORTFOLIO
   ============================================= */
.portfolio {
  background: linear-gradient(180deg, var(--bg-primary) 0%, #0d1424 100%);
}

[data-theme="light"] .portfolio {
  background: linear-gradient(180deg, var(--bg-primary) 0%, #e8ecf2 100%);
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition), background var(--transition);
  cursor: pointer;
  display: block;
  color: inherit;
  text-decoration: none;
}

.card:hover {
  border-color: var(--accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(44, 111, 170, 0.18);
  background: var(--bg-card-hover);
}

.card-logo {
  height: 52px;
  display: flex;
  align-items: center;
  margin-bottom: 1.25rem;
}

.card-logo img {
  max-height: 52px;
  max-width: 160px;
  width: auto;
  object-fit: contain;
  object-position: left center;
}

.card-title {
  font-size: 1.2rem;
  font-weight: 800;
  margin-bottom: 0.6rem;
  color: var(--text-primary);
}

.card-desc {
  font-size: 0.92rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* =============================================
   SERVICES
   ============================================= */
.services {
  background: var(--bg-primary);
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.service-card:hover {
  border-color: var(--accent);
  box-shadow: 0 8px 32px rgba(44, 111, 170, 0.15);
}

.service-icon {
  color: var(--accent);
  margin-bottom: 1.25rem;
}

.service-card h3 {
  font-size: 1.25rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.service-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.75;
}

/* =============================================
   CONTACT
   ============================================= */
.contact {
  background: linear-gradient(180deg, #0d1424 0%, var(--bg-primary) 100%);
}

[data-theme="light"] .contact {
  background: linear-gradient(180deg, #e8ecf2 0%, var(--bg-primary) 100%);
}

.contact-placeholder {
  max-width: 500px;
}

.contact-coming-soon {
  font-size: 1.5rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.contact-sub {
  font-size: 0.95rem;
  color: var(--text-muted);
  opacity: 0.7;
  line-height: 1.7;
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

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

/* =============================================
   SCROLL REVEAL ANIMATION
   ============================================= */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.65s ease, transform 0.65s ease;
}

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

/* =============================================
   RESPONSIVE
   ============================================= */
@media (min-width: 768px) {
  .services-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 767px) {
  .nav-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .mobile-overlay {
    display: flex;
  }

  .section {
    padding: 4rem 0;
  }

  .logo-badge img {
    height: 160px;
  }
}

@media (min-width: 1024px) {
  .about-text {
    font-size: 1.1rem;
  }
}

/* =============================================
   LOGO THEME HANDLING
   ============================================= */

/* Nav logo: white on dark, natural on light */
.nav-logo img {
  filter: brightness(0) invert(1);
}

[data-theme="light"] .nav-logo img {
  filter: none;
}

/* IG Defence logo is white-on-transparent — invert for light mode */
[data-theme="light"] .card-logo img[alt="IG Defence"] {
  filter: invert(1);
}