/* =========================================
   ETERA Teknoloji — Global Styles
   ========================================= */

/* ---------- Reset & Base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg-deep: #080c14;
  --bg-dark: #0d1120;
  --bg-card: #111827;
  --bg-card-hover: #1a2235;
  --border: rgba(255, 255, 255, 0.08);
  --blue: #0ea5e9;
  --blue-glow: rgba(14, 165, 233, 0.25);
  --blue-dark: #0284c7;
  --cyan: #22d3ee;
  --white: #f1f5f9;
  --muted: #94a3b8;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --font: "Barlow Condensed", system-ui, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-card: 0 4px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(14, 165, 233, 0.15);
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font);
  background: var(--bg-deep);
  color: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}
img {
  max-width: 100%;
  display: block;
}
ul {
  list-style: none;
}

/* ---------- Utility ---------- */
.container {
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 24px;
}

.section {
  padding-block: 96px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--blue) 0%, var(--cyan) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--blue);
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.2);
  padding: 4px 12px;
  border-radius: 50px;
  margin-bottom: 12px;
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-sub {
  color: var(--muted);
  max-width: 500px;
  font-size: 1.05rem;
}

.section-header {
  text-align: center;
  margin-bottom: 56px;
}

.section-header .section-sub {
  margin-inline: auto;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--blue) 0%, var(--cyan) 100%);
  color: #fff;
  box-shadow: 0 4px 20px var(--blue-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(14, 165, 233, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-full {
  width: 100%;
  justify-content: center;
}

/* =========================================
   HEADER
   ========================================= */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(8, 12, 20, 0.8);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: background var(--transition);
}

.header.scrolled {
  background: rgba(8, 12, 20, 0.95);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo-link {
  display: flex;
  align-items: center;
}

/* Header logo: dark theme → white (beyaz), light theme → navy (lacivert) */
.logo-light { display: none; }
.logo-dark  { display: block; }
[data-theme="light"] .logo-dark  { display: none; }
[data-theme="light"] .logo-light { display: block; }

.logo-img {
  height: 128px;
  width: auto;
  max-width: 440px;
  object-fit: contain;
}

/* Nav */
.nav-list {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
  color: var(--white);
  background: rgba(255, 255, 255, 0.06);
}

.nav-link.cta-btn {
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #fff !important;
  padding: 10px 20px;
}

.nav-link.cta-btn:hover {
  box-shadow: 0 4px 20px var(--blue-glow);
  transform: translateY(-1px);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.hamburger:hover {
  background: rgba(255, 255, 255, 0.06);
}

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

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

/* =========================================
   HERO
   ========================================= */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding-top: 80px;
}

/* Grid background */
.hero-bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(14, 165, 233, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14, 165, 233, 0.05) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(
    ellipse 80% 70% at 50% 50%,
    black 40%,
    transparent 100%
  );
}

/* Particles */
.hero-particles {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--blue);
  opacity: 0;
  animation: floatUp linear infinite;
}

@keyframes floatUp {
  0% {
    opacity: 0;
    transform: translateY(0) scale(0);
  }
  10% {
    opacity: 0.7;
  }
  90% {
    opacity: 0.3;
  }
  100% {
    opacity: 0;
    transform: translateY(-80vh) scale(1.5);
  }
}

/* Radial glow */
.hero::before {
  content: "";
  position: absolute;
  top: -20%;
  left: 50%;
  transform: translateX(-50%);
  width: 80vw;
  max-width: 900px;
  height: 60vh;
  background: radial-gradient(
    ellipse,
    rgba(14, 165, 233, 0.15) 0%,
    transparent 70%
  );
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding-block: 60px;
}

.hero-badge {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.08);
  border: 1px solid rgba(34, 211, 238, 0.2);
  padding: 6px 16px;
  border-radius: 50px;
  margin-bottom: 24px;
  animation: fadeDown 0.6s ease both;
}

.hero-title {
  font-size: clamp(2.5rem, 6vw, 5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
  animation: fadeDown 0.6s 0.1s ease both;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--muted);
  max-width: 560px;
  margin-bottom: 40px;
  animation: fadeDown 0.6s 0.2s ease both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 64px;
  animation: fadeDown 0.6s 0.3s ease both;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  flex-wrap: wrap;
  animation: fadeDown 0.6s 0.4s ease both;
}

.stat {
  text-align: left;
}

.stat-num {
  display: block;
  font-size: 1.6rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.stat-label {
  display: block;
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
}

.stat-divider {
  width: 1px;
  height: 40px;
  background: var(--border);
}

/* Scroll indicator */
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-scroll span {
  display: block;
  width: 22px;
  height: 38px;
  border: 2px solid var(--border);
  border-radius: 12px;
  position: relative;
}

.hero-scroll span::before {
  content: "";
  position: absolute;
  top: 6px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--blue);
  border-radius: 2px;
  animation: scrollBounce 1.6s ease infinite;
}

@keyframes scrollBounce {
  0%,
  100% {
    top: 6px;
    opacity: 1;
  }
  50% {
    top: 16px;
    opacity: 0.3;
  }
}

/* Animations */
@keyframes fadeDown {
  from {
    opacity: 0;
    transform: translateY(-20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.about-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 32px;
}

.about-logo-wrap {
  position: relative;
  display: flex;
  justify-content: center;
}

/* Dark theme: show white (beyaz) logo, hide navy (lacivert) */
.about-logo-light { display: none; }
.about-logo-dark  { display: block; }

.about-logo {
  width: 280px;
  height: auto;
  border-radius: var(--radius-md);
  filter: drop-shadow(0 0 40px rgba(14, 165, 233, 0.3));
  animation: logoFloat 4s ease-in-out infinite;
}

@keyframes logoFloat {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-12px);
  }
}

.about-logo-glow {
  position: absolute;
  inset: -20px;
  background: radial-gradient(
    ellipse,
    rgba(14, 165, 233, 0.15) 0%,
    transparent 70%
  );
  pointer-events: none;
  border-radius: 50%;
}

.about-tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.tag {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--blue);
  background: rgba(14, 165, 233, 0.08);
  border: 1px solid rgba(14, 165, 233, 0.2);
  padding: 6px 14px;
  border-radius: 50px;
  transition: var(--transition);
}

.tag:hover {
  background: rgba(14, 165, 233, 0.15);
  transform: translateY(-2px);
}

.about-desc {
  color: var(--muted);
  margin-bottom: 16px;
  font-size: 0.97rem;
}

.about-features {
  margin-top: 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.feature-item {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--muted);
  font-size: 0.92rem;
}

.feature-icon {
  color: var(--blue);
  font-size: 0.6rem;
  flex-shrink: 0;
}

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

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 36px 28px;
  position: relative;
  overflow: hidden;
  transition: var(--transition);
  cursor: default;
}

.service-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--blue), transparent);
  opacity: 0;
  transition: var(--transition);
}

.service-card:hover {
  background: var(--bg-card-hover);
  border-color: rgba(14, 165, 233, 0.25);
  transform: translateY(-6px);
  box-shadow:
    0 20px 60px rgba(0, 0, 0, 0.4),
    var(--shadow-glow);
}

.service-card:hover::before {
  opacity: 1;
}

.service-card.featured {
  border-color: rgba(14, 165, 233, 0.3);
  background: linear-gradient(145deg, #0d1a2d, var(--bg-card));
}

.service-card.featured::before {
  opacity: 1;
}

.service-badge {
  position: absolute;
  top: 16px;
  right: 16px;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--cyan);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.25);
  padding: 3px 10px;
  border-radius: 50px;
}

.service-icon {
  width: 52px;
  height: 52px;
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.15);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  color: var(--blue);
  transition: var(--transition);
}

.service-card:hover .service-icon {
  background: rgba(14, 165, 233, 0.18);
  box-shadow: 0 0 20px rgba(14, 165, 233, 0.2);
}

.service-icon svg {
  width: 28px;
  height: 28px;
}

.service-card h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.service-card p {
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.7;
  margin-bottom: 20px;
}

.service-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.service-list li {
  font-size: 0.82rem;
  color: var(--muted);
  padding-left: 16px;
  position: relative;
}

.service-list li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--blue);
  font-size: 0.75rem;
}

/* =========================================
   LOCATION
   ========================================= */
.location {
  background: var(--bg-dark);
}

.location-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}

.location-desc {
  color: var(--muted);
  margin-bottom: 32px;
  font-size: 0.97rem;
  line-height: 1.8;
}

.location-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 40px;
}

.location-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.loc-icon {
  width: 44px;
  height: 44px;
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.15);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--blue);
}

.loc-icon svg {
  width: 20px;
  height: 20px;
}

.location-item strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 4px;
}

.location-item p,
.location-item span {
  font-size: 0.88rem;
  color: var(--muted);
}

/* Map placeholder */
.location-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.map-embed {
  width: 100%;
  max-width: 420px;
  aspect-ratio: 4/3;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.map-embed iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
}

/* =========================================
   CONTACT
   ========================================= */
.contact {
  background: var(--bg-deep);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 48px;
  align-items: start;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.contact-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: var(--transition);
}

.contact-card:hover {
  border-color: rgba(14, 165, 233, 0.2);
  transform: translateX(4px);
}

.cc-icon {
  width: 44px;
  height: 44px;
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.15);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--blue);
}

.cc-icon svg {
  width: 20px;
  height: 20px;
}

.contact-card strong {
  display: block;
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
  margin-bottom: 4px;
}

.contact-card a,
.contact-card span {
  font-size: 0.95rem;
  color: var(--white);
  transition: var(--transition);
}

.contact-card a:hover {
  color: var(--blue);
}

/* Form */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 36px;
}

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

.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 20px;
}

.form-group label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
}

.form-group input,
.form-group textarea {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--white);
  font-family: var(--font);
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
  resize: vertical;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: rgba(148, 163, 184, 0.4);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--blue);
  background: rgba(14, 165, 233, 0.05);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

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

/* =========================================
   FOOTER
   ========================================= */
.footer {
  background: var(--bg-dark);
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: grid;
  grid-template-columns: 1.4fr 2fr;
  gap: 64px;
  padding-block: 64px;
}

.footer-logo {
  height: 40px;
  width: auto;
  object-fit: contain;
  margin-bottom: 16px;
}

/* Footer logo: dark theme → white (beyaz), light theme → navy (lacivert) */
.footer-logo-light { display: none; }
.footer-logo-dark  { display: block; }
[data-theme="light"] .footer-logo-dark  { display: none; }
[data-theme="light"] .footer-logo-light { display: block; }

.footer-brand p {
  color: var(--muted);
  font-size: 0.88rem;
  max-width: 220px;
  line-height: 1.7;
}

.footer-links {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.footer-col h4 {
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--white);
  margin-bottom: 16px;
}

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

.footer-col li a,
.footer-col li span {
  font-size: 0.85rem;
  color: var(--muted);
  transition: var(--transition);
}

.footer-col li a:hover {
  color: var(--blue);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-block: 20px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--muted);
}

/* =========================================
   RESPONSIVE
   ========================================= */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .about-visual {
    order: -1;
  }
  .location-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }
  .footer-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .footer-links {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (max-width: 768px) {
  .section {
    padding-block: 64px;
  }

  /* Hamburger visible */
  .hamburger {
    display: flex;
  }

  /* Nav overlay */
  .nav {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(8, 12, 20, 0.97);
    backdrop-filter: blur(16px);
    display: flex;
    align-items: center;
    justify-content: center;
    transform: translateX(100%);
    transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: 999;
  }

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

  .nav-list {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }

  .nav-link {
    font-size: 1.2rem;
    padding: 16px 32px;
  }

  .services-grid {
    grid-template-columns: 1fr;
  }
  .contact-grid {
    grid-template-columns: 1fr;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .footer-links {
    grid-template-columns: 1fr 1fr;
  }

  .hero-stats {
    gap: 20px;
  }

  .hero-actions {
    flex-direction: column;
    align-items: flex-start;
  }
  .hero-actions .btn {
    width: 100%;
    justify-content: center;
  }
}

@media (max-width: 480px) {
  .footer-links {
    grid-template-columns: 1fr;
  }
  .contact-form {
    padding: 24px;
  }
  .hero-stats {
    flex-direction: column;
    gap: 16px;
  }
  .stat-divider {
    width: 48px;
    height: 1px;
  }
}

/* =========================================
   HEADER EXTRAS — Lang switcher & Theme toggle
   ========================================= */
.header-extras {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 2px;
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .04em;
}

.lang-btn {
  padding: 5px 9px;
  border-radius: 6px;
  color: var(--muted);
  transition: var(--transition);
  border: 1px solid transparent;
  background: none;
  cursor: pointer;
  font-size: .78rem;
  font-weight: 600;
  font-family: var(--font);
  text-decoration: none;
  display: inline-block;
}

.lang-btn:hover { color: var(--white); background: rgba(255,255,255,.06); }
.lang-btn.active { color: var(--white); border-color: var(--border); background: rgba(255,255,255,.06); }

.lang-sep { color: var(--border); font-size: .7rem; }

.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: rgba(255,255,255,.06);
  border: 1px solid var(--border);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  transition: var(--transition);
  flex-shrink: 0;
}

.theme-toggle:hover { color: var(--white); background: rgba(255,255,255,.1); }
.theme-toggle svg { width: 16px; height: 16px; }
.theme-toggle .icon-sun  { display: none; }
.theme-toggle .icon-moon { display: block; }

/* =========================================
   LIGHT / B&W THEME
   ========================================= */
[data-theme="light"] {
  --bg-deep:       #F0F2F5;
  --bg-dark:       #FFFFFF;
  --bg-card:       #FFFFFF;
  --bg-card-hover: #F7F8FA;
  --border:        rgba(0,0,0,.1);
  --blue:          #1A1A2E;
  --blue-glow:     rgba(26,26,46,.15);
  --blue-dark:     #0F0F1E;
  --cyan:          #444466;
  --white:         #0F0F1E;
  --muted:         #5A6070;
  --shadow-card:   0 4px 24px rgba(0,0,0,.08);
  --shadow-glow:   0 0 40px rgba(26,26,46,.08);
}

[data-theme="light"] body { background: var(--bg-deep); color: var(--white); }

[data-theme="light"] .header {
  background: rgba(255,255,255,.9);
  border-bottom-color: rgba(0,0,0,.1);
}

[data-theme="light"] .header.scrolled { background: rgba(255,255,255,.97); }

[data-theme="light"] .hamburger span { background: var(--white); }

[data-theme="light"] .hero {
  background: var(--bg-deep);
}

[data-theme="light"] .hero::before {
  background: radial-gradient(ellipse, rgba(26,26,46,.07) 0%, transparent 70%);
}

[data-theme="light"] .hero-bg-grid {
  background-image:
    linear-gradient(rgba(26,26,46,.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(26,26,46,.06) 1px, transparent 1px);
}

[data-theme="light"] .hero-badge {
  color: #444466;
  background: rgba(26,26,46,.07);
  border-color: rgba(26,26,46,.2);
}

[data-theme="light"] .gradient-text {
  background: linear-gradient(135deg, #1A1A2E 0%, #555577 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="light"] .stat-num {
  background: linear-gradient(135deg, #1A1A2E, #555577);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

[data-theme="light"] .btn-primary {
  background: linear-gradient(135deg, #1A1A2E 0%, #3A3A5E 100%);
  box-shadow: 0 4px 20px rgba(26,26,46,.2);
}

[data-theme="light"] .btn-primary:hover {
  box-shadow: 0 8px 32px rgba(26,26,46,.3);
}

[data-theme="light"] .btn-outline {
  border-color: rgba(0,0,0,.2);
  color: var(--white);
}

[data-theme="light"] .btn-outline:hover {
  background: rgba(0,0,0,.05);
  border-color: rgba(0,0,0,.3);
}

[data-theme="light"] .section-label {
  color: #1A1A2E;
  background: rgba(26,26,46,.07);
  border-color: rgba(26,26,46,.2);
}

[data-theme="light"] .hero-scroll span { border-color: rgba(0,0,0,.2); }
[data-theme="light"] .hero-scroll span::before { background: #1A1A2E; }

[data-theme="light"] .tag {
  color: #1A1A2E;
  background: rgba(26,26,46,.06);
  border-color: rgba(26,26,46,.18);
}

[data-theme="light"] .tag:hover { background: rgba(26,26,46,.12); }

[data-theme="light"] .about { background: #FFFFFF; }
/* Light theme: hide white (beyaz) logo, show navy (lacivert) */
[data-theme="light"] .about-logo-dark  { display: none; }
[data-theme="light"] .about-logo-light { display: block; }
[data-theme="light"] .about-logo { filter: drop-shadow(0 0 30px rgba(26,26,46,.12)); }
[data-theme="light"] .about-logo-glow { background: radial-gradient(ellipse, rgba(26,26,46,.06) 0%, transparent 70%); }
[data-theme="light"] .feature-icon { color: #1A1A2E; }

[data-theme="light"] .services { background: var(--bg-deep); }

[data-theme="light"] .service-card {
  background: #FFFFFF;
  border-color: rgba(0,0,0,.1);
  box-shadow: 0 2px 12px rgba(0,0,0,.06);
}

[data-theme="light"] .service-card:hover {
  background: #FAFAFA;
  border-color: rgba(26,26,46,.2);
  box-shadow: 0 12px 40px rgba(0,0,0,.1);
}

[data-theme="light"] .service-card::before {
  background: linear-gradient(90deg, transparent, #1A1A2E, transparent);
}

[data-theme="light"] .service-card.featured {
  background: linear-gradient(145deg, #EEEEF5, #FFFFFF);
  border-color: rgba(26,26,46,.2);
}

[data-theme="light"] .service-badge {
  color: #333355;
  background: rgba(26,26,46,.08);
  border-color: rgba(26,26,46,.2);
}

[data-theme="light"] .service-icon {
  background: rgba(26,26,46,.07);
  border-color: rgba(26,26,46,.15);
  color: #1A1A2E;
}

[data-theme="light"] .service-card:hover .service-icon {
  background: rgba(26,26,46,.12);
  box-shadow: 0 0 16px rgba(26,26,46,.12);
}

[data-theme="light"] .service-list li::before { color: #1A1A2E; }

[data-theme="light"] .location { background: #FFFFFF; }
[data-theme="light"] .loc-icon {
  background: rgba(26,26,46,.07);
  border-color: rgba(26,26,46,.15);
  color: #1A1A2E;
}

[data-theme="light"] .map-embed {
  border-color: rgba(0,0,0,.1);
}

[data-theme="light"] .contact { background: var(--bg-deep); }

[data-theme="light"] .contact-card {
  background: #FFFFFF;
  border-color: rgba(0,0,0,.1);
}

[data-theme="light"] .contact-card:hover { border-color: rgba(26,26,46,.25); }

[data-theme="light"] .cc-icon {
  background: rgba(26,26,46,.07);
  border-color: rgba(26,26,46,.15);
  color: #1A1A2E;
}

[data-theme="light"] .contact-card a:hover { color: #3A3A6E; }

[data-theme="light"] .contact-form {
  background: #FFFFFF;
  border-color: rgba(0,0,0,.1);
}

[data-theme="light"] .form-group input,
[data-theme="light"] .form-group textarea {
  background: #F5F6FA;
  border-color: rgba(0,0,0,.12);
  color: #1A1A2E;
}

[data-theme="light"] .form-group input::placeholder,
[data-theme="light"] .form-group textarea::placeholder { color: rgba(90,96,112,.4); }

[data-theme="light"] .form-group input:focus,
[data-theme="light"] .form-group textarea:focus {
  border-color: #1A1A2E;
  background: rgba(26,26,46,.04);
  box-shadow: 0 0 0 3px rgba(26,26,46,.08);
}

[data-theme="light"] .footer {
  background: #FFFFFF;
  border-top-color: rgba(0,0,0,.1);
}

[data-theme="light"] .footer-col li a:hover { color: #3A3A6E; }

[data-theme="light"] .footer-bottom { border-top-color: rgba(0,0,0,.1); }

[data-theme="light"] .nav-link:hover,
[data-theme="light"] .nav-link.active {
  color: #1A1A2E;
  background: rgba(0,0,0,.06);
}

[data-theme="light"] .nav-link.cta-btn {
  background: linear-gradient(135deg, #1A1A2E, #3A3A5E);
  color: #fff !important;
}

[data-theme="light"] .nav-link.cta-btn:hover {
  box-shadow: 0 4px 20px rgba(26,26,46,.25);
}

[data-theme="light"] .lang-btn:hover { color: #1A1A2E; background: rgba(0,0,0,.06); }
[data-theme="light"] .lang-btn.active { color: #1A1A2E; border-color: rgba(0,0,0,.15); background: rgba(0,0,0,.06); }
[data-theme="light"] .lang-sep { color: rgba(0,0,0,.2); }

[data-theme="light"] .theme-toggle {
  background: rgba(0,0,0,.05);
  border-color: rgba(0,0,0,.12);
  color: var(--muted);
}

[data-theme="light"] .theme-toggle:hover { background: rgba(0,0,0,.1); color: #1A1A2E; }

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

[data-theme="light"] .particle { background: #1A1A2E; }

@media (max-width: 768px) {
  [data-theme="light"] .nav {
    background: rgba(255,255,255,.97);
  }
  .header-extras { gap: 6px; }
}