/* ==========================================================================
   İŞBORA AĞAÇ ÜRÜNLERİ & TEKSTİL
   Ana Stil Dosyası (Point Ahşap Şablon Mimarisi)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Cinzel:wght@600;700;800;900&family=Inter:wght@300;400;500;600;700;800&family=Montserrat:wght@400;500;600;700;800&display=swap');

:root {
  /* Renk Paleti - Kurumsal Lacivert & Sıcak Altın/Ahşap */
  --primary: #0A1C36;           /* Derin Kurumsal Lacivert */
  --primary-rgb: 10, 28, 54;
  --primary-light: #162E52;     /* Orta Lacivert */
  --primary-dark: #050E1B;      /* Çok Koyu Lacivert / Gece */
  
  --accent: #C59B4B;            /* Sıcak Altın / Ahşap Tonu */
  --accent-rgb: 197, 155, 75;
  --accent-light: #E5C37E;      /* Açık Altın */
  --accent-dark: #9E762E;       /* Koyu Bronz / Altın */
  
  --wood-brown: #7A4E2D;        /* Doğal Masif Ahşap */
  --wood-light: #A36B3E;
  
  --bg-main: #F8FAFC;           /* Açık Arka Plan */
  --bg-card: #FFFFFF;           /* Kart Yüzeyi */
  --bg-alt: #EEF2F6;            /* İkincil Bölüm Arka Planı */
  
  --text-main: #1E293B;         /* Ana Yazı Rengi */
  --text-muted: #64748B;        /* İkincil / Açıklama */
  --text-light: #94A3B8;        /* Soluk Yazı */
  
  --border-color: #E2E8F0;      /* İnce Kenarlık */
  --border-focus: #C59B4B;
  
  /* Gölgeler */
  --shadow-sm: 0 2px 4px rgba(10, 28, 54, 0.05);
  --shadow-md: 0 6px 18px rgba(10, 28, 54, 0.08);
  --shadow-lg: 0 14px 35px rgba(10, 28, 54, 0.12);
  --shadow-hover: 0 20px 40px rgba(10, 28, 54, 0.16);

  /* Font Ailesi */
  --font-heading: 'Cinzel', 'Montserrat', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  --container-max: 1280px;
}

/* --- Temel Sıfırlama (Reset) --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-body);
  color: var(--text-main);
  background-color: var(--bg-main);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: var(--transition);
}

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

ul, ol {
  list-style: none;
}

button, input, textarea, select {
  font-family: inherit;
  font-size: inherit;
  border: none;
  outline: none;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ==========================================================================
   TOP BAR (Point Ahşap Stili Üst Bilgi Çubuğu)
   ========================================================================== */
.topbar {
  background-color: var(--primary-dark);
  color: #CBD5E1;
  font-size: 0.825rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  z-index: 100;
}

.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  min-height: 40px;
  padding-top: 4px;
  padding-bottom: 4px;
}

.topbar-left, .topbar-right {
  display: flex;
  align-items: center;
  gap: 20px;
}

.topbar-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #CBD5E1;
  transition: var(--transition);
}

.topbar-item i {
  color: var(--accent);
  font-size: 0.85rem;
}

.topbar-item:hover {
  color: #FFFFFF;
}

.topbar-badge {
  background: rgba(197, 155, 75, 0.15);
  color: var(--accent-light);
  border: 1px solid rgba(197, 155, 75, 0.3);
  padding: 2px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.5px;
}

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

.topbar-social a {
  color: #94A3B8;
}

.topbar-social a:hover {
  color: var(--accent);
  transform: translateY(-2px);
}

/* ==========================================================================
   ANA HEADER & NAVİGASYON (Woodmart / Point Ahşap Düzeni)
   ========================================================================== */
.main-header {
  background-color: #FFFFFF;
  position: sticky;
  top: 0;
  z-index: 99;
  box-shadow: 0 4px 20px rgba(10, 28, 54, 0.06);
  transition: var(--transition);
}

.main-header.scrolled {
  box-shadow: 0 10px 30px rgba(10, 28, 54, 0.12);
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 90px;
  transition: height 0.3s ease;
}

.main-header.scrolled .header-inner {
  height: 75px;
}

/* Logo Alanı */
.logo-container {
  display: flex;
  align-items: center;
  text-decoration: none;
}

.site-logo {
  height: 65px;
  width: auto;
  object-fit: contain;
  transition: var(--transition);
}

.main-header.scrolled .site-logo {
  height: 54px;
}

/* Ana Navigasyon */
.main-nav {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-item {
  position: relative;
}

.nav-link {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 14px;
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--primary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  letter-spacing: 0.2px;
}

.nav-link i.dropdown-chevron {
  font-size: 0.75rem;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: var(--accent-dark);
}

.nav-link:hover i.dropdown-chevron {
  transform: rotate(180deg);
  color: var(--accent-dark);
}

/* Sektör Özel Vurgu Rozeti */
.nav-sector-badge {
  font-size: 0.65rem;
  padding: 2px 6px;
  border-radius: 4px;
  font-weight: 700;
  text-transform: uppercase;
}

.badge-agac {
  background: #E8F5E9;
  color: #2E7D32;
}

.badge-tekstil {
  background: #E0F2FE;
  color: #0369A1;
}

/* Açılır Menü (Dropdown) */
.dropdown-menu {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 260px;
  background: #FFFFFF;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  padding: 10px 0;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: all 0.25s cubic-bezier(0.165, 0.84, 0.44, 1);
  z-index: 110;
}

.nav-item:hover .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.dropdown-item a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-main);
  transition: var(--transition);
}

.dropdown-item a:hover {
  background-color: #F1F5F9;
  color: var(--accent-dark);
  padding-left: 24px;
}

.dropdown-item a i {
  font-size: 0.75rem;
  opacity: 0;
  transition: opacity 0.2s ease;
}

.dropdown-item a:hover i {
  opacity: 1;
}

/* Header Eylem Butonları */
.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

.btn-rfq {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, #C59B4B 0%, #A87C2E 100%);
  color: #FFFFFF;
  font-weight: 700;
  font-size: 0.9rem;
  padding: 11px 22px;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 14px rgba(197, 155, 75, 0.35);
  transition: var(--transition);
  cursor: pointer;
  letter-spacing: 0.3px;
}

.btn-rfq:hover {
  background: linear-gradient(135deg, #D4AF37 0%, #B8860B 100%);
  box-shadow: 0 6px 20px rgba(197, 155, 75, 0.45);
  transform: translateY(-2px);
  color: #FFFFFF;
}

.btn-whatsapp-header {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  background: #25D366;
  color: #FFFFFF;
  border-radius: var(--radius-md);
  font-size: 1.25rem;
  box-shadow: 0 4px 12px rgba(37, 211, 102, 0.25);
  transition: var(--transition);
}

.btn-whatsapp-header:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(37, 211, 102, 0.4);
}

.mobile-toggle {
  display: none;
  background: none;
  font-size: 1.5rem;
  color: var(--primary);
  cursor: pointer;
}

/* ==========================================================================
   HERO SLIDER (Point Ahşap & Çift Sektör Banner)
   ========================================================================== */
.hero-section {
  position: relative;
  background: var(--primary);
  color: #FFFFFF;
  min-height: 580px;
  overflow: hidden;
}

.hero-slider {
  position: relative;
  width: 100%;
  height: 580px;
}

.hero-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.8s ease, visibility 0.8s ease;
  display: flex;
  align-items: center;
}

.hero-slide.active {
  opacity: 1;
  visibility: visible;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transform: scale(1.05);
  transition: transform 6s ease;
}

.hero-slide.active .hero-bg {
  transform: scale(1);
}

.hero-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, rgba(10, 28, 54, 0.92) 0%, rgba(10, 28, 54, 0.75) 50%, rgba(10, 28, 54, 0.4) 100%);
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 680px;
  padding: 40px 0;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(197, 155, 75, 0.2);
  border: 1px solid var(--accent);
  color: var(--accent-light);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 0.825rem;
  font-weight: 700;
  letter-spacing: 2px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 3.1rem;
  font-weight: 800;
  line-height: 1.15;
  color: #FFFFFF;
  margin-bottom: 18px;
  letter-spacing: 0.5px;
}

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

.hero-description {
  font-size: 1.1rem;
  color: #E2E8F0;
  margin-bottom: 32px;
  line-height: 1.6;
}

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

.btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: linear-gradient(135deg, #C59B4B 0%, #A87C2E 100%);
  color: #FFFFFF;
  padding: 14px 30px;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 18px rgba(197, 155, 75, 0.4);
  transition: var(--transition);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #D4AF37 0%, #B8860B 100%);
  transform: translateY(-2px);
  color: #FFFFFF;
}

.btn-outline-white {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: transparent;
  color: #FFFFFF;
  border: 2px solid rgba(255, 255, 255, 0.8);
  padding: 12px 28px;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: var(--radius-md);
  backdrop-filter: blur(4px);
  transition: var(--transition);
}

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

/* Slider Kontrolleri */
.slider-controls {
  position: absolute;
  bottom: 30px;
  right: 60px;
  z-index: 20;
  display: flex;
  align-items: center;
  gap: 14px;
}

.slider-btn {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.15);
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: #FFFFFF;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  transition: var(--transition);
  backdrop-filter: blur(6px);
}

.slider-btn:hover {
  background: var(--accent);
  border-color: var(--accent);
  color: #FFFFFF;
}

.slider-dots {
  display: flex;
  gap: 8px;
  margin-right: 12px;
}

.slider-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.4);
  cursor: pointer;
  transition: var(--transition);
}

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

/* ==========================================================================
   TRUST BAR / İSTATİSTİKLER (25+ Yıl, 50.000m2 vb.)
   ========================================================================== */
.trust-bar {
  background: #FFFFFF;
  border-bottom: 1px solid var(--border-color);
  padding: 24px 0;
  box-shadow: var(--shadow-sm);
}

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

.trust-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 12px;
}

.trust-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background: rgba(197, 155, 75, 0.12);
  color: var(--accent-dark);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}

.trust-number {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--primary);
  line-height: 1.2;
}

.trust-label {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ==========================================================================
   SEKTÖR BÖLÜMÜ TANITIMI (Çift Sektör Kartları)
   ========================================================================== */
.sectors-intro-section {
  padding: 60px 0 30px;
}

.section-header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 40px;
}

.section-tag {
  display: inline-block;
  font-size: 0.825rem;
  font-weight: 700;
  color: var(--accent-dark);
  text-transform: uppercase;
  letter-spacing: 3px;
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--primary);
  margin-bottom: 14px;
  line-height: 1.25;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-muted);
}

.sectors-split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 30px;
}

.sector-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  min-height: 320px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 36px;
  transition: var(--transition);
  color: #FFFFFF;
}

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

.sector-card-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  transition: transform 0.6s ease;
}

.sector-card:hover .sector-card-bg {
  transform: scale(1.08);
}

.sector-card-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, rgba(10, 28, 54, 0.3) 0%, rgba(10, 28, 54, 0.88) 100%);
}

.sector-card-content {
  position: relative;
  z-index: 5;
}

.sector-card-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.badge-wood-dark {
  background: rgba(197, 155, 75, 0.3);
  color: #F7EEDD;
  border: 1px solid #C59B4B;
}

.badge-textile-dark {
  background: rgba(56, 189, 248, 0.25);
  color: #BAE6FD;
  border: 1px solid #38BDF8;
}

.sector-card-title {
  font-family: var(--font-heading);
  font-size: 1.85rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.sector-card-desc {
  font-size: 0.925rem;
  color: #E2E8F0;
  margin-bottom: 20px;
  line-height: 1.5;
}

.sector-card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--accent-light);
  letter-spacing: 0.5px;
}

.sector-card:hover .sector-card-link {
  color: #FFFFFF;
}

.sector-card-link i {
  transition: transform 0.2s ease;
}

.sector-card:hover .sector-card-link i {
  transform: translateX(4px);
}

/* ==========================================================================
   KURUMSAL AVANTAJLAR (Neden İşbora? - Point Ahşap Info Box Düzeni)
   ========================================================================== */
.features-section {
  padding: 80px 0;
  background-color: #FFFFFF;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}

.feature-box {
  background: var(--bg-main);
  border: 1px solid var(--border-color);
  padding: 32px 24px;
  border-radius: var(--radius-md);
  transition: var(--transition);
  text-align: left;
}

.feature-box:hover {
  background: #FFFFFF;
  border-color: var(--accent);
  box-shadow: var(--shadow-md);
  transform: translateY(-5px);
}

.feature-icon-wrapper {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-md);
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 20px;
  transition: var(--transition);
}

.feature-box:hover .feature-icon-wrapper {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: #FFFFFF;
}

.feature-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 10px;
}

.feature-text {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* ==========================================================================
   HAKKIMIZDA & ÜRETİM VİTRİNİ BÖLÜMÜ
   ========================================================================== */
.about-preview-section {
  padding: 80px 0;
  background-color: var(--bg-alt);
}

.about-preview-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: center;
}

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

.about-img-main {
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  width: 100%;
  height: 420px;
  object-fit: cover;
}

.about-experience-badge {
  position: absolute;
  bottom: -20px;
  right: -20px;
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-light) 100%);
  color: #FFFFFF;
  padding: 24px 28px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  border: 3px solid var(--accent);
  text-align: center;
}

.exp-number {
  font-size: 2.2rem;
  font-weight: 900;
  color: var(--accent-light);
  line-height: 1;
}

.exp-label {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1px;
}

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

.about-lead {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--primary);
  margin-bottom: 16px;
}

.about-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.about-checklist {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 30px;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.925rem;
  font-weight: 600;
  color: var(--primary);
}

.check-item i {
  color: var(--accent-dark);
}

/* ==========================================================================
   FOOTER (Point Ahşap & Woodmart 4 Kolonlu Kurumsal Alt Bölüm)
   ========================================================================== */
.main-footer {
  background-color: var(--primary-dark);
  color: #CBD5E1;
  padding-top: 70px;
  border-top: 3px solid var(--accent);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1.2fr 1.2fr 1.6fr;
  gap: 40px;
  padding-bottom: 60px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-col-about .footer-logo {
  height: 60px;
  margin-bottom: 20px;
}

.footer-about-text {
  font-size: 0.9rem;
  line-height: 1.6;
  color: #94A3B8;
  margin-bottom: 24px;
}

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

.footer-social-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.08);
  color: #CBD5E1;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: var(--transition);
}

.footer-social-btn:hover {
  background: var(--accent);
  color: #FFFFFF;
  transform: translateY(-3px);
}

.footer-col-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 22px;
  position: relative;
  padding-bottom: 10px;
}

.footer-col-title::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 36px;
  height: 2px;
  background-color: var(--accent);
}

.footer-links-list li {
  margin-bottom: 11px;
}

.footer-links-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: #94A3B8;
}

.footer-links-list a:hover {
  color: var(--accent-light);
  padding-left: 5px;
}

.footer-links-list a i {
  font-size: 0.65rem;
  color: var(--accent);
}

.footer-contact-list li {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 16px;
  font-size: 0.875rem;
  color: #94A3B8;
}

.footer-contact-list i {
  color: var(--accent);
  margin-top: 4px;
  font-size: 1rem;
  flex-shrink: 0;
}

.footer-bottom {
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.825rem;
  color: #64748B;
}

.footer-bottom a {
  color: #94A3B8;
}

.footer-bottom a:hover {
  color: var(--accent-light);
}

/* Back to top button */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 44px;
  height: 44px;
  background: var(--primary);
  border: 1px solid var(--accent);
  color: var(--accent-light);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
}

.back-to-top:hover {
  background: var(--accent);
  color: #FFFFFF;
  transform: translateY(-4px);
}