/* =====================================================
       GENEL STILLER
    ===================================================== */
    body {
      font-family: 'Inter', system-ui, sans-serif;
      color: #1e293b;
    }

    /* =====================================================
       NAVBAR
    ===================================================== */
    .navbar {
      border-bottom: 1px solid #e2e8f0;
      padding: 0.75rem 0;
    }
    .navbar-brand span {
      font-weight: 800;
      font-size: 1.3rem;
      color: #1a56db;
    }
    .brand-icon {
      width: 34px;
      height: 34px;
      background: linear-gradient(135deg, #1a56db, #3b82f6);
      border-radius: 9px;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }
    .nav-link {
      color: #475569 !important;
      font-weight: 500;
      font-size: 0.92rem;
    }
    .nav-link:hover, .nav-link.active {
      color: #1a56db !important;
    }

    /* =====================================================
       HERO BÖLÜMÜ
    ===================================================== */
    .hero {
      background: linear-gradient(135deg, #eff6ff 0%, #e0f2fe 100%);
      padding: 5rem 0 4rem;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #dbeafe;
      color: #1a56db;
      font-size: 0.8rem;
      font-weight: 600;
      padding: 0.35rem 0.85rem;
      border-radius: 50px;
      margin-bottom: 1.25rem;
    }
    .hero h1 {
      font-size: clamp(2rem, 4vw, 3rem);
      font-weight: 800;
      line-height: 1.15;
      letter-spacing: -1px;
      color: #0f172a;
    }
    .hero h1 span {
      color: #1a56db;
    }
    .hero p.lead {
      color: #64748b;
      font-size: 1.05rem;
      line-height: 1.7;
    }
    .hero-check {
      display: flex;
      align-items: center;
      gap: 6px;
      font-size: 0.85rem;
      color: #475569;
    }

    /* Uygulama Önizleme Kutusu */
    .app-preview {
      border-radius: 16px;
      box-shadow: 0 25px 60px rgba(15,23,42,0.18);
      border: 1px solid #e2e8f0;
      overflow: hidden;
      background: #fff;
    }
    .preview-topbar {
      background: #1e293b;
      padding: 0.65rem 1rem;
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .preview-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .preview-url {
      font-size: 0.7rem;
      color: #64748b;
      margin-left: 8px;
    }
    .preview-body {
      background: #f8fafc;
      padding: 1.25rem;
    }
    .mini-card {
      border-radius: 10px;
      padding: 0.75rem 1rem;
    }
    .mini-card .label { font-size: 0.65rem; color: #64748b; font-weight: 600; }
    .mini-card .value { font-size: 1rem; font-weight: 800; color: #0f172a; margin-top: 2px; }
    .mini-card .trend { font-size: 0.65rem; font-weight: 600; margin-top: 2px; }
    .invoice-row {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0.5rem 0;
      border-bottom: 1px solid #f1f5f9;
      font-size: 0.78rem;
    }
    .invoice-row:last-child { border-bottom: none; }
    .status-pill {
      font-size: 0.65rem;
      font-weight: 700;
      padding: 2px 8px;
      border-radius: 50px;
    }

    /* =====================================================
       İSTATİSTİK BÖLÜMÜ
    ===================================================== */
    .stats-section {
      background: #fff;
      padding: 3rem 0;
      border-bottom: 1px solid #f1f5f9;
    }
    .stat-number {
      font-size: 2.2rem;
      font-weight: 800;
      color: #1a56db;
      line-height: 1;
    }
    .stat-label {
      font-size: 0.875rem;
      color: #64748b;
      margin-top: 4px;
      font-weight: 500;
    }

    /* =====================================================
       BÖLÜM BAŞLIKLARI
    ===================================================== */
    .section-tag {
      font-size: 0.75rem;
      font-weight: 700;
      letter-spacing: 1.5px;
      text-transform: uppercase;
      color: #1a56db;
    }
    .section-heading {
      font-size: clamp(1.6rem, 3vw, 2.4rem);
      font-weight: 800;
      letter-spacing: -0.5px;
      color: #0f172a;
      line-height: 1.2;
    }
    .section-sub {
      font-size: 1rem;
      color: #64748b;
      line-height: 1.7;
      max-width: 560px;
      margin: 0 auto;
    }

    /* =====================================================
       ÖZELLİK KARTLARI
    ===================================================== */
    .features-section { padding: 5rem 0; background: #f8fafc; }
    .feature-card {
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 16px;
      padding: 2rem;
      height: 100%;
      transition: transform 0.2s, box-shadow 0.2s;
    }
    .feature-card:hover {
      transform: translateY(-4px);
      box-shadow: 0 12px 30px rgba(15,23,42,0.1);
    }
    .feature-icon {
      width: 52px;
      height: 52px;
      border-radius: 14px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 1rem;
    }
    .feature-card h5 { font-weight: 700; font-size: 1rem; color: #0f172a; }
    .feature-card p  { font-size: 0.9rem; color: #64748b; line-height: 1.6; margin: 0; }

    /* =====================================================
       NASIL ÇALIŞIR
    ===================================================== */
    .how-section { padding: 5rem 0; background: #fff; }
    .step-circle {
      width: 48px; height: 48px;
      border-radius: 50%;
      background: #1a56db;
      color: #fff;
      font-weight: 800;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      justify-content: center;
      flex-shrink: 0;
    }
    .step-line {
      width: 2px;
      flex: 1;
      background: #e2e8f0;
      margin: 0 auto;
      min-height: 28px;
    }

    /* =====================================================
       MÜŞTERİ YORUMLARI
    ===================================================== */
    .testimonials-section { padding: 5rem 0; background: #f8fafc; }
    .testimonial-card {
      background: #fff;
      border: 1px solid #e2e8f0;
      border-radius: 16px;
      padding: 2rem;
      height: 100%;
    }
    .stars { color: #f59e0b; font-size: 1rem; }
    .avatar {
      width: 42px; height: 42px;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.85rem;
      color: #fff;
    }

    /* =====================================================
       CTA BANNER
    ===================================================== */
    .cta-section {
      background: linear-gradient(135deg, #1a56db 0%, #1d4ed8 100%);
      padding: 5rem 0;
      color: #fff;
    }
    .cta-section h2 {
      font-size: clamp(1.7rem, 3vw, 2.5rem);
      font-weight: 800;
      letter-spacing: -0.5px;
    }

    /* =====================================================
       FOOTER
    ===================================================== */
    .footer-dark {
      background: #0f172a;
      color: #64748b;
      padding: 3.5rem 0 2rem;
    }
    .footer-brand { font-size: 1.3rem; font-weight: 800; color: #fff; }
    .footer-desc  { font-size: 0.875rem; line-height: 1.6; max-width: 280px; }
    .footer-heading {
      font-size: 0.75rem; font-weight: 700;
      text-transform: uppercase; letter-spacing: 1px;
      color: #fff; margin-bottom: 1rem;
    }
    .footer-link {
      display: block; color: #64748b;
      font-size: 0.875rem; text-decoration: none;
      padding: 0.3rem 0; transition: color 0.2s;
    }
    .footer-link:hover { color: #fff; }
    .footer-divider { border-color: #1e293b; margin: 2rem 0 1.5rem; }
    .footer-copy { font-size: 0.8rem; color: #475569; }

    /* =====================================================
       BUTONLAR (Bootstrap üzerine özelleştirme)
    ===================================================== */
    .btn-brand {
      background: #1a56db;
      border: none;
      color: #fff;
      font-weight: 600;
      padding: 0.7rem 1.75rem;
      border-radius: 10px;
      font-size: 0.95rem;
      transition: background 0.2s, transform 0.15s;
    }
    .btn-brand:hover { background: #1d4ed8; color: #fff; transform: translateY(-1px); }
    .btn-ghost {
      background: transparent;
      border: 1.5px solid #cbd5e1;
      color: #475569;
      font-weight: 600;
      padding: 0.7rem 1.75rem;
      border-radius: 10px;
      font-size: 0.95rem;
      transition: all 0.2s;
    }
    .btn-ghost:hover { border-color: #1a56db; color: #1a56db; background: #eff6ff; }