/* ═══════════════════════════════════════
   REFERANS YAPI - Main Stylesheet
   Professional Construction Company Site
   ═══════════════════════════════════════ */

:root {
  --primary: #1a56db;
  --primary-dark: #0f3a8e;
  --primary-light: #3b82f6;
  --primary-bg: #eff6ff;
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --success: #10b981;
  --warning: #f59e0b;
  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Playfair Display', Georgia, serif;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --shadow-xl: 0 25px 50px -12px rgba(0,0,0,0.25);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-primary);
  color: var(--gray-700);
  background: var(--white);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* ─── Preloader ─── */
#preloader {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.5s, visibility 0.5s;
}

#preloader.hidden {
  opacity: 0;
  visibility: hidden;
}

.preloader-inner {
  text-align: center;
}

.preloader-logo {
  width: auto;
  height: 80px;
  background: none;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  animation: pulse 1.5s ease-in-out infinite;
}

.preloader-logo img {
  height: 100%;
  width: auto;
  object-fit: contain;
}

.preloader-slogan {
  font-family: var(--font);
  font-size: 14px;
  font-weight: 400;
  color: var(--gray-500);
  letter-spacing: 0.04em;
  margin-bottom: 20px;
}

.preloader-bar {
  width: 200px;
  height: 3px;
  background: var(--gray-200);
  border-radius: 2px;
  overflow: hidden;
}

.preloader-progress {
  height: 100%;
  background: var(--primary);
  border-radius: 2px;
  animation: loading 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

@keyframes loading {
  0% { width: 0; margin-left: 0; }
  50% { width: 70%; margin-left: 15%; }
  100% { width: 0; margin-left: 100%; }
}

/* ─── Container ─── */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ─── Navigation ─── */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(20px);
  padding: 10px 0;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

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

.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--white);
  transition: var(--transition);
}

.navbar.scrolled .nav-logo {
  color: var(--gray-900);
}

.logo-placeholder {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: var(--white);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  flex-shrink: 0;
}

.logo-placeholder.has-logo {
  width: auto;
  height: 50px;
  background: white;
  border-radius: 8px;
  padding: 4px 8px;
}

.navbar.scrolled .logo-placeholder.has-logo {
  background: white;
}

.logo-placeholder.has-logo img {
  height: 100%;
  width: auto;
  object-fit: contain;
}

.nav-logo-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.brand-slogan {
  font-size: 11px;
  opacity: 0.7;
  letter-spacing: 0.02em;
  font-weight: 400;
}

.nav-links {
  display: flex;
  gap: 8px;
  align-items: center;
}

.nav-link {
  text-decoration: none;
  color: rgba(255, 255, 255, 0.85);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--white);
  background: rgba(255, 255, 255, 0.12);
}

.navbar.scrolled .nav-link {
  color: var(--gray-600);
}

.navbar.scrolled .nav-link:hover,
.navbar.scrolled .nav-link.active {
  color: var(--primary);
  background: var(--primary-bg);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--white);
  border-radius: 2px;
  transition: var(--transition);
}

.navbar.scrolled .nav-toggle span {
  background: var(--gray-900);
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--primary);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(26, 86, 219, 0.3);
}

.btn-primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(26, 86, 219, 0.4);
}

.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255, 255, 255, 0.4);
}

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

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

/* ─── Hero Section ─── */
.hero {
  position: relative;
  height: 100vh;
  min-height: 700px;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero-slider {
  position: absolute;
  inset: 0;
}

.hero-slide {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  opacity: 0;
  transition: opacity 1s ease;
  transform: scale(1.05);
}

.hero-slide.active {
  opacity: 1;
  transform: scale(1);
  transition: opacity 1s ease, transform 8s ease;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(15, 58, 142, 0.85) 0%, rgba(26, 86, 219, 0.65) 50%, rgba(15, 23, 42, 0.7) 100%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 700px;
  padding: 0 24px;
  margin: 0 auto;
  text-align: center;
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 50px;
  color: rgba(255, 255, 255, 0.9);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-bottom: 24px;
  backdrop-filter: blur(10px);
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 700;
  color: var(--white);
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.hero-subtitle {
  font-size: clamp(18px, 2.5vw, 24px);
  color: rgba(255, 255, 255, 0.9);
  font-weight: 400;
  margin-bottom: 20px;
  letter-spacing: 0.01em;
}

.hero-description {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1.8;
  margin-bottom: 36px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-slider-controls {
  position: absolute;
  bottom: 80px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
  display: flex;
  align-items: center;
  gap: 16px;
}

.slider-btn {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
  backdrop-filter: blur(10px);
}

.slider-btn:hover {
  background: rgba(255, 255, 255, 0.3);
}

.slider-dots {
  display: flex;
  gap: 8px;
}

.slider-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.3);
  cursor: pointer;
  transition: var(--transition);
}

.slider-dot.active {
  background: var(--white);
  width: 28px;
  border-radius: 5px;
}

.hero-scroll {
  position: absolute;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 3;
}

.hero-scroll a {
  color: rgba(255, 255, 255, 0.6);
  font-size: 18px;
  animation: bounce 2s infinite;
  text-decoration: none;
}

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

/* ─── Sections ─── */
.section {
  padding: 100px 0;
}

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

.section-tag {
  display: none;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 700;
  color: var(--gray-900);
  line-height: 1.2;
  margin-bottom: 16px;
  letter-spacing: -0.02em;
}

.section-title .highlight {
  color: var(--primary);
}

.section-desc {
  font-size: 17px;
  color: var(--gray-500);
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ─── Projects ─── */
.projects-section {
  background: var(--gray-50);
}

.projects-grid {
  display: flex;
  flex-direction: column;
  gap: 64px;
}

.project-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
}

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

.project-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  align-items: center;
}

.project-card:nth-child(even) .project-inner {
  direction: rtl;
}

.project-card:nth-child(even) .project-inner > * {
  direction: ltr;
}

.project-gallery {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/10;
  background: #0a0a0a;
  border-radius: 16px;
}

.gallery-slides {
  position: relative;
  width: 100%;
  height: 100%;
}

.gallery-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.6s ease;
  z-index: 0;
}

.gallery-slide.active {
  opacity: 1;
  z-index: 1;
}

.gallery-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  cursor: pointer;
}

.gallery-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(0,0,0,0.4);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: all 0.3s ease;
  opacity: 0;
  backdrop-filter: blur(4px);
}

.project-gallery:hover .gallery-arrow {
  opacity: 1;
}

.gallery-arrow:hover {
  background: rgba(0,0,0,0.7);
  transform: translateY(-50%) scale(1.1);
}

.gallery-prev { left: 12px; }
.gallery-next { right: 12px; }

.gallery-counter {
  position: absolute;
  top: 16px;
  right: 16px;
  z-index: 3;
  background: rgba(0,0,0,0.5);
  color: #fff;
  padding: 4px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
  backdrop-filter: blur(4px);
}

.project-card:hover .gallery-slide.active img {
  transform: scale(1.02);
}

.gallery-slide img {
  transition: transform 0.5s ease;
}

/* Lightbox */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 10000;
  background: rgba(0,0,0,0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
  backdrop-filter: blur(8px);
}

.lightbox.open {
  opacity: 1;
  visibility: visible;
}

.lightbox-img {
  max-width: 92vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
  transform: scale(0.9);
  transition: transform 0.3s ease;
}

.lightbox.open .lightbox-img {
  transform: scale(1);
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 24px;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s;
  z-index: 3;
}

.lightbox-close:hover {
  background: rgba(255,255,255,0.3);
}

.lightbox-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: rgba(255,255,255,0.15);
  color: #fff;
  border: none;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.3s;
  z-index: 3;
}

.lightbox-arrow:hover {
  background: rgba(255,255,255,0.3);
}

.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

.lightbox-counter {
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255,255,255,0.7);
  font-size: 14px;
  font-weight: 500;
  z-index: 3;
}

.project-status {
  position: absolute;
  top: 16px;
  left: 16px;
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.03em;
  z-index: 2;
}

.project-status.completed {
  background: var(--success);
  color: var(--white);
}

.project-status.ongoing {
  background: var(--warning);
  color: var(--white);
}

.project-gallery-nav {
  position: absolute;
  bottom: 12px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 2;
}

.project-gallery-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.project-gallery-dot.active {
  background: var(--white);
  width: 20px;
  border-radius: 4px;
}

.project-info {
  padding: 40px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.project-name {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.project-location {
  font-size: 14px;
  color: var(--gray-400);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.project-description {
  font-size: 15px;
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 24px;
  white-space: pre-line;
}

.project-features {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-feature {
  display: none;
}

.project-features {
  display: none;
}

/* ─── About Section ─── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.about-image-wrapper {
  position: relative;
}

.about-image {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}

.about-image img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  display: block;
}

.about-experience {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: var(--primary);
  color: var(--white);
  padding: 24px 32px;
  border-radius: var(--radius);
  text-align: center;
  box-shadow: var(--shadow-lg);
}

.exp-number {
  display: block;
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
}

.exp-text {
  font-size: 12px;
  opacity: 0.8;
  margin-top: 4px;
}

.about-content .section-tag {
  display: inline-block;
}

.about-content .section-title {
  text-align: left;
}

.about-text {
  font-size: 15px;
  color: var(--gray-600);
  line-height: 1.8;
  margin-bottom: 32px;
  white-space: pre-line;
}

.about-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.stat-item {
  text-align: center;
  padding: 16px 8px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
}

.stat-number {
  font-family: var(--font-display);
  font-size: 24px;
  font-weight: 700;
  color: var(--primary);
  line-height: 1;
}

.stat-label {
  font-size: 12px;
  color: var(--gray-500);
  margin-top: 6px;
}

/* ─── Vision & Mission ─── */
.vision-section {
  background: var(--gray-50);
}

.vision-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  margin-bottom: 64px;
}

.vision-card {
  background: var(--white);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--gray-100);
}

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

.vision-icon {
  width: 56px;
  height: 56px;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  margin-bottom: 20px;
}

.vision-card h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 16px;
}

.vision-card p {
  font-size: 15px;
  color: var(--gray-600);
  line-height: 1.8;
  white-space: pre-line;
}

.values-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.value-card {
  text-align: center;
  padding: 32px 20px;
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
  border: 1px solid var(--gray-100);
}

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

.value-icon {
  width: 48px;
  height: 48px;
  background: var(--primary-bg);
  color: var(--primary);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  margin: 0 auto 16px;
}

.value-card h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 8px;
}

.value-card p {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.7;
}

/* ─── Team Section ─── */
.team-section {
  background: var(--gray-50);
}

.team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 32px;
  max-width: 900px;
  margin: 0 auto;
}

.team-card {
  background: var(--white);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow);
  text-align: center;
  transition: var(--transition);
}

.team-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
}

.team-card-photo {
  width: 100%;
  aspect-ratio: 3/4;
  overflow: hidden;
  background: var(--gray-100);
}

.team-card-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.team-card:hover .team-card-photo img {
  transform: scale(1.04);
}

.team-card-info {
  padding: 24px 20px;
}

.team-card-info h4 {
  font-size: 18px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 4px;
}

.team-card-info .team-role {
  font-size: 14px;
  color: var(--primary);
  font-weight: 500;
  margin-bottom: 8px;
}

.team-card-info .team-bio {
  font-size: 13px;
  color: var(--gray-500);
  line-height: 1.7;
  text-align: left;
  white-space: pre-line;
}

/* ─── Contact Section ─── */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
}

.contact-map {
  margin-top: 48px;
  border-radius: 16px;
  overflow: hidden;
}

.contact-map iframe {
  display: block;
  width: 100%;
  height: 400px;
  border: 0;
  border-radius: 16px;
}

.contact-info {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-content: start;
}

.contact-card {
  padding: 28px;
  background: var(--gray-50);
  border-radius: var(--radius);
  transition: var(--transition);
  border: 1px solid var(--gray-100);
}

.contact-card:hover {
  background: var(--primary-bg);
  border-color: var(--primary-bg);
}

.contact-icon {
  width: 44px;
  height: 44px;
  background: var(--primary);
  color: var(--white);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  margin-bottom: 16px;
}

.contact-card h4 {
  font-size: 14px;
  font-weight: 700;
  color: var(--gray-900);
  margin-bottom: 6px;
}

.contact-card p {
  font-size: 14px;
  color: var(--gray-500);
}

.contact-form-wrapper {
  background: var(--white);
  padding: 40px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  border: 1px solid var(--gray-100);
}

.form-group {
  margin-bottom: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-family: var(--font-primary);
  font-size: 14px;
  color: var(--gray-800);
  transition: var(--transition);
  background: var(--gray-50);
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--primary);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}

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

/* ─── Footer ─── */
.footer {
  background: var(--gray-900);
  color: var(--gray-300);
  padding: 64px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer-logo .logo-placeholder.has-logo {
  height: 60px;
  background: white;
  border-radius: 8px;
  padding: 6px 10px;
}

.footer-logo .brand-name {
  color: var(--white);
  font-size: 18px;
}

.footer-logo .brand-slogan {
  color: var(--gray-400);
  font-size: 11px;
}

.footer-desc {
  font-size: 14px;
  color: var(--gray-400);
  line-height: 1.7;
}

.footer-links h4,
.footer-contact h4,
.footer-social h4 {
  color: var(--white);
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 20px;
}

.footer-links a {
  display: block;
  color: var(--gray-400);
  text-decoration: none;
  font-size: 14px;
  padding: 6px 0;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--white);
  padding-left: 4px;
}

.footer-contact p {
  font-size: 14px;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-contact i {
  color: var(--primary-light);
  width: 16px;
}

.social-links {
  display: flex;
  gap: 12px;
}

.social-links a {
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--gray-400);
  text-decoration: none;
  transition: var(--transition);
}

.social-links a:hover {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--white);
}

.footer-bottom {
  padding: 24px 0;
  text-align: center;
  font-size: 13px;
  color: var(--gray-500);
}

/* ─── Back to Top ─── */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  background: var(--primary);
  color: var(--white);
  border: none;
  border-radius: 50%;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  box-shadow: var(--shadow-lg);
  transition: var(--transition);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  z-index: 100;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--primary-dark);
  transform: translateY(-4px);
}

/* ─── Animations ─── */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Responsive ─── */
@media (max-width: 1024px) {
  .project-inner {
    grid-template-columns: 1fr;
  }

  .project-card:nth-child(even) .project-inner {
    direction: ltr;
  }

  .project-gallery {
    aspect-ratio: 16/10;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

  .values-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--white);
    flex-direction: column;
    padding: 80px 32px 32px;
    box-shadow: var(--shadow-xl);
    transition: right 0.3s ease;
    gap: 4px;
  }

  .nav-links.open {
    right: 0;
  }

  .nav-links .nav-link {
    color: var(--gray-700);
    font-size: 16px;
    padding: 12px 16px;
  }

  .nav-links .nav-link:hover,
  .nav-links .nav-link.active {
    color: var(--primary);
    background: var(--primary-bg);
  }

  .nav-toggle {
    display: flex;
    z-index: 1001;
  }

  .hero-content {
    padding: 0 20px;
  }

  .about-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-experience {
    bottom: -16px;
    right: 16px;
    padding: 16px 24px;
  }

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

  .contact-info {
    grid-template-columns: 1fr;
  }

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

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

  .hero-slider-controls {
    bottom: 60px;
  }

  .project-info {
    padding: 28px;
  }
}

@media (max-width: 480px) {
  .hero {
    min-height: 600px;
  }

  .section {
    padding: 64px 0;
  }

  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    padding: 12px 28px;
    font-size: 14px;
  }

  .brand-slogan {
    display: none;
  }

  .contact-form-wrapper {
    padding: 24px;
  }
}